JP2021025478A - Pump device and electric motor assembly - Google Patents

Abstract

To provide a pump device capable of cooling a pump part and/or an electric motor assembly efficiently.SOLUTION: A pump device 300 includes a pump part 301 and an electric motor assembly 1. The pump part 301 includes pump part side rectification projections 335. The electric motor assembly 1 includes at least one electric motor assembly side rectification projection 330 disposed so as to be arranged in a straight line with at least one of the pump part side rectification projections 335.SELECTED DRAWING: Figure 27

Description

The present invention relates to a pump device and an electric motor assembly.

There is a pump device provided with an electric motor assembly. Such a pump device includes a pump unit having components that serve as a heat source.

Japanese Unexamined Patent Publication No. 8-289505

As an example of a component component that becomes a heat source, a shaft sealing device for preventing the transferred liquid from leaking to the motor assembly side can be mentioned. When a component of the pump portion (for example, a shaft sealing device) generates heat, there is a concern that the life of the component may be shortened. Therefore, it is important to adopt a configuration for cooling the pump unit.

The electric motor assembly includes components (for example, an inverter and a motor) that are heat sources. When the electric motor assembly is operated, the inverter and the motor generate heat, and as a result, there is a concern that the life of the components will be shortened. Therefore, the adoption of a configuration for cooling the motor assembly is important.

Therefore, an object of the present invention is to provide a pump device capable of efficiently cooling a pump unit and / or an electric motor assembly. An object of the present invention is to provide an electric motor assembly capable of efficiently cooling a component component.

In one aspect, the pump unit comprises an electric motor assembly with a drive shaft, and the pump unit includes a plurality of pump unit side rectifying protrusions extending outward from the outer surface of the pump unit. The electric motor assembly is provided with a pump device including at least one electric motor assembly-side rectifying protrusion arranged so as to be aligned with at least one of the plurality of pump-side rectifying protrusions.

In one aspect, the motor assembly side rectifying projection extends outward in the axial direction of the drive shaft.
In one aspect, the pump portion includes an impeller and a pump casing accommodating the impeller, and the pump portion side rectifying projection is provided on the pump casing.
In one aspect, the pump unit includes a guard member that covers a coupling guard for transmitting the power of the electric motor assembly to the pump unit, and the pump unit side rectifying projection is provided on the guard member.

In one aspect, the pump portion includes a pump bracket that connects a pump casing accommodating an impeller and the electric motor assembly, and the pump portion side rectifying protrusion is provided on the pump bracket.
In one aspect, the pumping device is a vertical pumping device in which the drive shaft extends in the vertical direction.
In one aspect, the pumping device is a horizontal pumping device in which the drive shaft extends in the horizontal direction.

In one aspect, the motor assembly accommodates a motor that rotates the drive shaft, a motor casing that houses the motor, an inverter that controls the motor, and the inverter, along the axial direction of the drive shaft. The inverter case includes an inverter case connected in series to the motor casing, and the inverter case includes a plurality of inverter case-side rectifying protrusions extending outward from the outer surface of the inverter case.
In one aspect, a cooling fan arranged outside the inverter case and fixed to the drive shaft, a fan cover connected to the inverter case so as to cover the cooling fan, and from the inner surface to the inside of the fan cover. A plurality of fan cover side rectifying protrusions extending toward the fan cover side rectifying protrusions are provided, and at least one of the plurality of fan cover side rectifying protrusions is arranged so as to be aligned with at least one of the plurality of inverter case side rectifying protrusions. Will be done.
In one aspect, the motor assembly further comprises at least one motor casing side rectifying protrusion extending outward from the outer surface of the motor casing, wherein the motor casing side rectifying protrusion is a plurality of inverter case side rectifying protrusions. It is arranged so as to be aligned with at least one of them in a straight line in the axial direction of the drive shaft.

In one aspect, the motor assembly further comprises a positioning structure that determines the relative position of the motor casing and the inverter case.
In one aspect, the electric motor assembly includes a motor that rotates the drive shaft, a motor casing in which the motor is arranged, an inverter that controls the operation of the motor, and the inverter that is arranged inside. The inverter case through which the drive shaft penetrates, the cooling fan arranged adjacent to the inverter case and fixed to the end of the drive shaft, and the inside of the inverter case so as to cover the periphery of the drive shaft. The communication space that is interposed between the motor casing and the inverter case and that communicates the air flow path and the external space is provided between the tubular wall that forms the air flow path formed by the rotation of the cooling fan. A spacer formed between the motor casing and the inverter case is provided.

In one aspect, it is an electric motor assembly that is a prime mover of a pump that conveys a liquid, and is a drive shaft, a motor that rotates the drive shaft, a motor casing in which the motor is arranged, and a reaction of the motor casing. An inverter arranged on the load side to control the operation of the motor, an inverter case in which the inverter is arranged inside, and a cooling fan arranged on the opposite load side of the inverter and fixed to the drive shaft. The motor casing includes a plurality of motor casing-side rectifying protrusions extending outward from the outer surface of the motor casing, and the inverter case includes one of the plurality of motor casing-side rectifying protrusions and the drive shaft. The cooling fan includes at least one inverter case-side rectifying protrusion arranged so as to be aligned in a straight line in the axial direction of the motor, and the cooling fan causes air around the pump to be rectified by the rotation of the cooling fan. Provided is an electric motor assembly that generates an air flow for guiding the motor to the rectifying protrusion on the inverter case side.

In one aspect, the motor assembly further comprises a fan cover that covers at least a portion of the cooling fan and the inverter case side rectifying projections and guides the airflow to the cooling fan.

In one aspect, a pump device comprising the electric motor assembly and a pump driven by the electric motor assembly is provided.

In one aspect, a linear motion pump device is provided in which the rotation shaft of the pump and the drive shaft are composed of a single shaft.

According to the present invention, the cooling air generated by the rotation of the cooling fan flows linearly. Therefore, the air for cooling the pump section and / or the motor assembly can cool the pump section and / or the motor assembly without impairing its flow velocity. As a result, the pump section and / or the motor assembly is efficiently cooled.

It is a perspective view which shows one Embodiment of an electric motor assembly. It is sectional drawing which shows one Embodiment of an electric motor assembly. It is a figure which shows how the heat of a motor and the heat of an inverter are released to the outside of an electric motor assembly through a motor bracket. It is a side view of the electric motor assembly shown in FIG. It is a figure seen from the A line direction of FIG. It is a figure seen from the B line direction of FIG. It is a side view of a fan cover. It is a figure seen from the C line direction of FIG. It is a figure seen from the D line direction of FIG. It is a figure which shows the fan cover side rectifying protrusion and the inverter case side rectifying protrusion arranged so that they are aligned with each other. It is a figure which shows one Embodiment of the positioning structure. It is a figure which shows the other embodiment of the positioning structure. It is a figure which shows still another embodiment of a positioning structure. It is sectional drawing which shows the other embodiment of an electric motor assembly. It is sectional drawing which shows still another embodiment of the electric motor assembly. It is sectional drawing which shows still another embodiment of the electric motor assembly. It is a figure which shows the air flow path and the connection structure of a tubular wall to an inverter case. It is a figure which shows the cooling fan side cover member and a tubular wall which were integrally constructed. It is a figure which shows the motor casing side cover member and the tubular wall which were integrally constructed. 16 is a cross-sectional view taken along the line AA of FIG. It is a perspective view of a part of an electric motor assembly. It is a figure which shows the flow of the air sent by the rotation of a cooling fan. It is a perspective view which shows the other embodiment of a spacer. It is sectional drawing which shows still another embodiment of the electric motor assembly. It is a figure for demonstrating the effect of the fan cover which concerns on embodiment shown in FIG. It is sectional drawing which shows still another embodiment of the electric motor assembly. It is a figure which shows the pump device to which an electric motor assembly is applicable. It is a figure seen from the E line direction of FIG. It is a partially enlarged view of a pump device. It is a figure which shows the other embodiment of a pump device. It is a figure which shows still another embodiment of a pump device. It is a figure which shows still another embodiment of a pump device. It is a figure which shows one Embodiment of the horizontal type pump device. It is a figure which shows the other embodiment of the pump device which concerns on embodiment shown in FIG. 33. It is a figure which shows the electric motor assembly side end face of the pump casing shown in FIG. It is a figure which shows still another embodiment of the pump device shown in FIG. 33. It is a figure which shows the other embodiment of the horizontal type pump device. It is a figure which shows the other embodiment of the pump device which concerns on embodiment shown in FIG. 37. It is a figure which shows still another embodiment of the pump device which concerns on embodiment shown in FIG. 37. It is a figure which shows still another embodiment of the pump device which concerns on embodiment shown in FIG. 37. It is a figure which shows still another embodiment of the horizontal type pump device. It is a figure which shows the other embodiment of the pump device which concerns on embodiment shown in FIG. 41. It is a figure which shows the pump device which provided the cooling structure for cooling a pump part and / or an electric motor assembly more effectively. It is a perspective view of the cooling structure shown in FIG. 43. It is a figure which shows the other embodiment of a cooling structure. It is a figure which shows still another embodiment of a cooling structure. It is a perspective view of the cooling structure shown in FIG. It is a figure which shows still another embodiment of a cooling structure. It is a perspective view of the cooling structure shown in FIG. 48. It is a figure which shows still another embodiment of a cooling structure. It is a perspective view of the cooling structure shown in FIG. FIG. 52A is a diagram showing a substrate fixed to the inner surface of the motor casing side cover member. FIG. 52 (b) is a diagram showing a comparative example with the configuration shown in FIG. 52 (a). FIG. 53A is a diagram showing another embodiment of the inverter. FIG. 53B is a diagram showing still another embodiment of the inverter. It is a figure which shows the other embodiment of the inverter case. It is a figure which shows still another embodiment of the electric motor assembly. It is a perspective view which shows the sensor mounting part. It is sectional drawing of the bearing support member provided with the sensor mounting part. FIG. 57 is a view of the bearing support member shown in FIG. 57 as viewed from the axial direction of the drive shaft. It is a figure which shows the other embodiment of the sensor attachment part. It is a figure which shows still another embodiment of the sensor attachment part. It is an enlarged view of the sensor mounting part shown in FIG. It is a figure which shows the sensor attachment part provided on the surface of a bearing support member. It is a figure which shows the sensor attachment part provided in the surface concave part of a bearing support member. It is a figure which shows the cooling structure (see FIG. 44) applied to the electric motor assembly provided with a sensor mounting part. It is a figure which shows the cooling structure (see FIG. 45) applied to the electric motor assembly provided with a sensor mounting part.

In recent years, there has been an increasing demand for higher efficiency and smaller motors. One of the methods for achieving high efficiency of the motor is a drive control technology using an inverter. In such a drive control technique, control is performed to make the motor highly efficient according to the drive environment and drive state of the motor.

Regarding the miniaturization of the motor, the core of the motor is designed so that its shape is optimized, and a method of reducing the size of the motor itself may be adopted. On the other hand, an inverter is required to perform drive control for realizing high-efficiency drive of the motor. Therefore, both the motor and the inverter are installed.

An electric motor assembly including an inverter unit and a motor unit is known. In such an electric motor assembly, the inverter unit includes an inverter and an inverter case for accommodating the inverter. The motor unit includes a motor including a rotor and a stator for rotating the drive shaft, and a motor casing for accommodating the motor.

Since the inverter and the motor are heat sources, when the electric motor assembly is operated, the heat of the inverter is transferred to the inverter case, and the temperature of the inverter case becomes high. Similarly, the heat of the motor is transferred to the motor casing, and the motor casing becomes hot. As a result, the motor assembly as a whole becomes very hot. Therefore, the motor assembly includes a fan fixed to the drive shaft. The fan rotates with the rotation of the drive shaft to cool the outer surface of the inverter case and the outer surface of the motor casing.

However, since each of the motor and the inverter is a heat source, these motors and the inverter tend to get hot with each other. When the temperature of the motor and the inverter becomes high, there is a concern that the motor components and / or the inverter components may be burnt, the life of the motor components and / or the inverter components may be shortened, and / or the motor efficiency may be reduced. To. Under these circumstances, it is essential to adopt a cooling structure for motors and inverters.

The fan can send air to the outer surface of the inverter case and the outer surface of the motor casing by its rotation, but cannot send air to the space where the inverter, which is the heat generating source, is arranged, that is, the inner space of the inverter case. Therefore, the internal space of the inverter case may not be sufficiently cooled. As a result, this interior space can become very hot.

Since the components of the inverter are greatly affected by the temperature of the internal space of the inverter case, if the internal space of the inverter case is high, the components of the inverter may be damaged or the life of the components of the inverter may be damaged. May decrease. Therefore, it is important to cool the inverter by lowering the temperature of the internal space of the inverter case.

As a cooling method of the inverter, a method of sending air in the external space directly to the internal space of the inverter case can be considered. However, in such a method, foreign matter such as dust or water droplets may enter the internal space of the inverter case. Since the inverter is an electrical component, if such foreign matter adheres to the inverter, the inverter may break down.

In the embodiments described below, at least one of the above problems can be solved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, the same or corresponding components are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a perspective view showing an embodiment of the electric motor assembly 1. FIG. 2 is a cross-sectional view showing an embodiment of the electric motor assembly 1. The electric motor assembly 1 is a mechanical device having an integrated structure in which an inverter 20 is built. As shown in FIGS. 1 and 2, the electric motor assembly 1 includes a motor unit 2 and an inverter unit 3. The electric motor assembly 1 accommodates a drive shaft 5, a motor (rotating element) 8 including a rotor (rotor) 6 and a stator (stator) 7 for rotating the drive shaft 5, and a rotor 6 and a stator 7. The motor casing 10, the inverter 20 arranged adjacent to the rotor 6 and the stator 7, that is, the inverter 20 arranged on the opposite load side of the motor casing 10 and controlling the operation (rotation speed) of the motor 8, and the inverter 20 It includes an inverter case 21 that is housed and is arranged in series with the motor casing 10 along the axis CL direction of the drive shaft 5.

The drive shaft 5 extends through the motor casing 10 and the inverter case 21, and the motor casing 10 and the inverter case 21 are arranged concentrically with the drive shaft 5. In the present embodiment, since the motor casing 10 and the inverter case 21 are arranged in series in the axis CL direction of the drive shaft 5, the electric motor assembly 1 can have a compact structure. A cooling fan 25 arranged concentrically with the drive shaft 5 is fixed to the end of the drive shaft 5 (that is, on the counterload side of the drive shaft 5). In other words, the cooling fan 25 is arranged on the opposite load side of the inverter 20. The cooling fan 25 is arranged outside the inverter case 21 and is adjacent to the inverter case 21. In one embodiment, the cooling fan 25 is a centrifugal fan.

In the drawings shown below, the air flowing from the cooling fan 25 may be represented by arrow A1 and the air flowing toward the cooling fan 25 is represented by arrow A2 for easy understanding of the air flow. There are times. Although both the air flowing from the cooling fan 25 (arrow A1) and the air flowing toward the cooling fan 25 (arrow A2) are drawn, the air flow from the cooling fan 25 toward the motor casing 10 is drawn. The cooling fan 25 has a structure that forms an air flow only in the direction indicated by the arrow A1, and the cooling fan 25 forms an air flow from the motor casing 10 to the inverter case 21. If so, the cooling fan 25 forms an air flow only in the direction indicated by the arrow A2.

A motor 8 which is a heat generating source is arranged inside the motor casing 10. The motor 8 surrounds the rotor 6 fixed to the drive shaft 5 and the stator (stator) in which the winding (coil) 7b receives electric power from the outside (not shown) to form a rotating magnetic field. ) 7 and. The stator 7 includes a stator core 7a and a plurality of windings 7b wound around the stator core 7a. The rotor 6 is rotated by a rotating magnetic field formed between the rotor 6 and the stator 7, and the drive shaft 5 to which the rotor 6 is fixed rotates together with the rotor 6.

In FIG. 2, the motor 8 is schematically depicted. The motor 8 is, for example, a permanent magnet type motor in which a permanent magnet is used for the rotor. However, the motor 8 is not limited to the permanent magnet type motor, and may be various types of motors such as an induction motor and an SR motor.

The motor casing 10 includes a motor frame 11 to which the stator 7 is fixed, an end cover 12 in which one open end of the motor frame 11 is closed and a through hole 30 through which the drive shaft 5 penetrates is formed, and the motor frame 11. It is provided with a motor bracket 13 in which the other open end of the motor bracket 13 is closed and a through hole 31 through which the drive shaft 5 penetrates is formed. The end cover 12 and the motor bracket 13 face each other with the motor 8 interposed therebetween. The drive shaft 5 is rotatably supported by a bearing 27 supported by a bearing support portion 32 of the end cover 12 and a bearing 28 supported by a bearing support portion 33 of the motor bracket 13.

The inverter case 21 surrounds the inverter 20, in other words, includes an inverter frame 22 arranged around the inverter 20 and a cover member 23 that closes the open end of the inverter frame 22. The inverter frame 22 is arranged adjacent to the motor bracket 13 and is connected to the motor bracket 13.

The electric motor assembly 1 includes an inverter case 21 so as to cover the cooling fan 25, and more specifically, a fan cover 51 connected to a cover member 23. The fan cover 51 is a member for sending cooling air to the inverter section 3 and the motor section 2 in this order while preventing the human finger from coming into contact with the cooling fan 25. The fan cover 51 is arranged so as to cover the cover member 23, and is fixed to the cover member 23. The fan cover 51 has an opening 51a formed on the surface of the fan cover 51 facing the cooling fan 25.

A plurality of fins 36 are formed on the outer surface of the cover member 23. These fins 36 are adjacent to the cooling fan 25 and extend from the outer surface of the cover member 23 toward the cooling fan 25. The cover member 23 is arranged concentrically with the drive shaft 5, and a through hole 40 through which the drive shaft 5 penetrates is formed in the center of the cover member 23. The drive shaft 5 extends to the outside of the cover member 23 through the through hole 40.

The inverter 20 is arranged inside the inverter case 21. The inverter 20 includes an inverter element 41 including elements such as a switching element and a capacitor, and a substrate 42 on which the inverter element 41 is mounted. The substrate 42 is fixed to the inner surface of the cover member 23 via the spacer 43. The inner surface of the cover member 23 is a surface opposite to the outer surface of the cover member 23 on which the fins 36 are formed. The cover member 23 has a saucer shape on which the substrate 42 is placed. With such a structure, the cover member 23 can be filled with a resin for heat dissipation and surface protection of the substrate 42.

The electric motor assembly 1 further includes a shaft cover 50 that covers the periphery of the drive shaft 5. The shaft cover 50 is an isolation member that separates the drive shaft 5 and the inverter 20. The shaft cover 50 has a cylindrical shape and is arranged concentrically with the drive shaft 5. The shape of the shaft cover 50 is not particularly limited. The shaft cover 50 extends in the axis CL direction of the drive shaft 5. A connection line that electrically connects the inverter 20 (that is, the inverter element 41 and the substrate 42) and the inverter 20 and the winding 7b of the stator 7 is arranged outside the shaft cover 50.

The substrate 42 has an annular shape through which the drive shaft 5 and the shaft cover 50 penetrate, and the substrate 42 and the shaft cover 50 are arranged concentrically with the drive shaft 5. By providing the shaft cover 50, it is possible to prevent the connection wire from being caught in the drive shaft 5 and contacting the inverter element 41 with the drive shaft 5. As a result, failure of the inverter 20 can be reliably prevented.

In the present embodiment, the motor frame 11 and the inverter frame 22 are made of separate members, and the motor bracket 13 is interposed between the motor frame 11 and the inverter frame 22. The motor frame 11 and the motor bracket 13 are connected to each other, and the inverter frame 22 and the motor bracket 13 are connected to each other. As described above, the motor frame 11, the motor bracket 13, and the inverter frame 22 are composed of separate members, and the motor frame 11 and the inverter frame 22 are connected via the motor bracket 13, so that the operator can use the motor. The bracket 13 can be removed from the motor frame 11. Therefore, the operator can easily replace the bearing 28 without pulling out the rotor 6. That is, such a structure can improve the maintainability of the electric motor assembly 1.

Since the motor frame 11, the motor bracket 13, and the inverter frame 22 are made of separate members, materials suitable for the purpose can be applied to the motor frame 11, the motor bracket 13, and the inverter frame 22. Each of the motor 8 and the inverter 20 is a heat source. Therefore, for example, when considering the heat dissipation of the motor 8 and the inverter 20, it is preferable to use aluminum (Al) having a high thermal conductivity as the material of the motor frame 11 and the inverter frame 22. However, in order to avoid insufficient strength of the motor frame 11 and the inverter frame 22, the thickness of the motor frame 11 and the thickness of the inverter frame 22 tend to be thick. As a result, the accommodation space of the motor 8 and the inverter 20 may be reduced.

On the other hand, when the material of the motor frame 11 and the material of the inverter frame 22 are iron materials, the thickness of the motor frame 11 and the inverter are compared with the case where the material of the motor frame 11 and the material of the inverter frame 22 are aluminum materials. The thickness of the frame 22 can be reduced. However, since iron has a lower thermal conductivity than aluminum, the heat dissipation of the heat source may be inferior. Therefore, the material of the motor frame 11 that requires the accommodation space of the motor 8 and the material of the inverter frame 22 that requires the accommodation space of the inverter 20 are made of iron, and in order to secure the heat dissipation of the heat source, the motor bracket 13 is used. The material is preferably an aluminum material having high thermal conductivity.

FIG. 3 is a diagram showing how the heat of the motor 8 and the heat of the inverter 20 are released to the outside of the motor assembly 1 through the motor bracket 13. The arrows shown by the thick lines in FIG. 3 represent the heat flow of the motor 8 and the heat of the inverter 20 through the motor bracket 13. In FIG. 3, the illustration of the heat flow of the motor 8 through the motor frame 11 and the heat flow of the inverter 20 through the inverter frame 22 is omitted. In the present embodiment, the material of the motor frame 11, the material of the inverter frame 22, and the material of the motor bracket 13 can be arbitrarily changed, so that the accommodation space of the motor 8 and the accommodation space of the inverter 20 can be secured. Moreover, the heat dissipation of the motor 8 and the inverter 20 can be ensured.

It is known that the cooling fan attached to the tip of the drive shaft is covered with a fan cover. According to such a configuration, since the air flow is formed by the rotation of the cooling fan, the heat generating source is indirectly cooled through the accommodating member. However, in the configuration in which the fan cover is simply provided, turbulent air flow is formed in the space between the inner surface of the fan cover and the outer surface of the accommodating member, and the air flowing due to the rotation of the cooling fan tends to diffuse. Become. As a result, the cooling performance of the heat source deteriorates with the loss of the air flow velocity (that is, the wind speed). Therefore, in the present embodiment, the electric motor assembly 1 can send the air flowing by the rotation of the cooling fan 25 to the inverter case 21 and the motor casing 10 more effectively, that is, without lowering the flow velocity of the air. It has a structure that can be used.

FIG. 4 is a side view of the electric motor assembly 1 shown in FIG. FIG. 5 is a view seen from the direction of line A in FIG. FIG. 6 is a view seen from the direction of line B of FIG. FIG. 7 is a side view of the fan cover 51. FIG. 8 is a view seen from the direction of line C in FIG. FIG. 9 is a view seen from the direction of line D in FIG.

The fan cover 51 includes a tubular portion 52 to which the cover member 23 is fixed, and a tapered portion (that is, a fan case portion) 53 connected to the tubular portion 52. In the present embodiment, the tubular portion 52 and the tapered portion 53 are integrally molded members. The cover member 23 has a protrusion 24 extending outward from its outer surface (see FIGS. 1, 2, 3, and 6). One end of the tubular portion 52 is fixed to the protruding portion 24 of the cover member 23. One end of the tubular portion 52 is a portion of the tubular portion 52 on the inverter case 21 side. When the tubular portion 52 is fixed to the cover member 23, a gap is formed between the inner surface 52a of the tubular portion 52 and the outer surface of the cover member 23. The tapered portion 53 is connected to the other end of the tubular portion 52. The other end of the tubular portion 52 is a portion opposite to one end of the tubular portion 52. The tapered portion 53 has a shape in which the diameter gradually decreases as the diameter of the tapered portion 53 increases from the tubular portion 52. An opening 51a is formed on the end surface of the tapered portion 53. In one embodiment, the tapered portion 53 does not have to have a tapered shape.

The openings 51a of the fan cover 51 are a plurality of holes arranged in an aligned manner, and each of the plurality of holes has a size such that a human finger does not come into contact with the cooling fan 25 (FIG. 5). , 8 and 9). The shape of the opening 51a of the fan cover 51 is not limited to this embodiment. The cooling fan 25 is arranged inside the tapered portion 53 of the fan cover 51, and is adjacent to the opening 51a of the fan cover 51. That is, the cooling fan 25 is arranged on the upstream side of the tubular portion 52 in the flow direction of the air flowing due to its rotation. When the cooling fan 25 rotates, the air around the opening 51a of the fan cover 51 passes through the opening 51a and is sucked into the inside of the fan cover 51.

As shown in FIG. 9, the electric motor assembly 1 includes a plurality of fan cover side rectifying protrusions 55 extending inward from the inner surface 52a of the tubular portion 52 of the fan cover 51, that is, toward the cover member 23. .. In other words, the electric motor assembly 1 includes a first fan cover side rectifying protrusion 55 and a second fan cover side rectifying protrusion 55. In the embodiment shown in FIG. 9, a plurality of fan cover side rectifying protrusions 55 including a first fan cover side rectifying protrusion 55 and a second fan cover side rectifying protrusion 55 are provided on the inner surface 52a of the tubular portion 52. There is. More specifically, the first fan cover side rectifying projection 55 to the 40th fan cover side rectifying projection 55 are provided. The number of fan cover side rectifying protrusions 55 is not limited to this embodiment. The number of fan cover side rectifying protrusions 55 may be an even number or an odd number.

As shown in FIG. 9, the plurality of fan cover side rectifying protrusions 55 are arranged at equal intervals along the circumferential direction of the inner surface 52a of the tubular portion 52, and are arranged inward in the radial direction of the inner surface 52a of the tubular portion 52. It is extending. The plurality of fan cover side rectifying protrusions 55 also extend in the axis CL direction of the drive shaft 5. In one embodiment, although not shown, the plurality of fan cover side rectifying protrusions 55 may be arranged at irregular intervals along the circumferential direction of the inner surface 52a of the tubular portion 52.

In order to stably fix the fan cover 51 to the protruding portion 24 of the cover member 23, the connection portion 52b of the tubular portion 52 with the cover member 23 has a planar shape. With such a shape, the connection portion 52b can be brought into close contact with the end surface of the protruding portion 24 of the cover member 23, and as a result, the fan cover 51 is stably fixed to the cover member 23. The fan cover side rectifying projection 55 located at the connection portion 52b extends perpendicularly to the connection portion 52b.

As shown in FIGS. 1, 2, 3, and 4, the electric motor assembly 1 includes a plurality of inverters extending outward from the outer surface of the inverter case 21, more specifically, the outer surface 22a of the inverter frame 22. It is provided with a case-side rectifying protrusion 56. In other words, the electric motor assembly 1 includes a first inverter case side rectifying projection 56 and a second inverter case side rectifying projection 56. In the present embodiment, the outer surface 22a of the inverter frame 22 is provided with a plurality of inverter case-side rectifying protrusions 56 including a first inverter case-side rectifying protrusion 56 and a second inverter case-side rectifying protrusion 56. Each of the plurality of inverter case-side rectifying protrusions 56 extends over the entire inverter frame 22. The number of rectifying protrusions 56 on the inverter case side is not limited to this embodiment. The number of the inverter case side rectifying protrusions 56 may be an even number or an odd number.

The plurality of inverter case-side rectifying protrusions 56 are arranged at equal intervals along the circumferential direction of the outer surface 22a of the inverter frame 22, and extend outward in the radial direction of the outer surface 22a of the inverter frame 22. These plurality of inverter case-side rectifying protrusions 56 also extend in the axis CL direction of the drive shaft 5. In one embodiment, although not shown, the plurality of inverter case-side rectifying protrusions 56 may be arranged at irregular intervals along the circumferential direction of the outer surface 22a of the inverter frame 22.

The first fan cover side rectifying projection 55 and the first inverter case side rectifying projection 56 are arranged so as to be aligned with each other, and the second fan cover side rectifying projection 55 and the second inverter case side rectifying projection 56 are arranged. Are arranged so that they are lined up in a straight line. In one embodiment, the number of fan cover side rectifying protrusions 55 and the number of inverter case side rectifying protrusions 56 are the same, and the distance between the fan cover side rectifying protrusions 55 adjacent to each other is the same as the number of inverter case side rectifying protrusions 56 adjacent to each other. It is the same as the interval between. Each of the plurality of fan cover side rectifying protrusions 55 is aligned with each of the plurality of inverter case side rectifying protrusions 56. Preferably, the vertical cross-sectional shape of the fan cover side rectifying protrusion 55 is the same as the vertical cross-sectional shape of the inverter case side rectifying protrusion 56.

FIG. 10 is a diagram showing a fan cover side rectifying protrusion 55 and an inverter case side rectifying protrusion 56 arranged so as to be aligned with each other. In FIG. 10, two fan cover side rectifying protrusions 55 adjacent to each other and two inverter case side rectifying protrusions 56 adjacent to each other are drawn, and other than the fan cover side rectifying protrusion 55 and the inverter case side rectifying protrusion 56. Illustration of the elements is omitted.

When the fan cover 51 is attached to the inverter case 21, the end surface 55a of the first fan cover side rectifying projection 55 is adjacent (contacted) to the end surface 56a of the first inverter case side rectifying projection 56, and the second fan cover The end surface 55a of the side rectifying projection 55 is adjacent (contacted) to the end surface 56a of the second inverter case side rectifying projection 56. The end surface 55a of the fan cover side rectifying projection 55 is a surface adjacent to the inverter case side rectifying projection 56, and the end surface 56a of the inverter case side rectifying projection 56 is a surface adjacent to the fan cover side rectifying projection 55.

As shown in FIG. 10, the distance D1 between the fan cover side rectifying protrusions 55 adjacent to each other is the same as the distance D2 between the inverter case side rectifying protrusions 56 adjacent to each other. As described above, since the distance D1 and the distance D2 are the same as each other, when the fan cover 51 is attached to the cover member 23, the fan cover side rectifying protrusion 55 and the inverter case side rectifying protrusion 56 may be aligned in a straight line. it can. When the cooling fan 25 rotates in this state, air flows linearly in the flow path between the fan cover side rectifying protrusions 55 adjacent to each other and the flow path between the inverter case side rectifying protrusions 56 adjacent to each other. That is, the air can flow toward the inverter case 21 and the motor casing 10 in a rectified state without disturbing the flow (see the arrow in FIG. 10).

In the present embodiment, the cooling fan 25 is surrounded by the tapered portion 53 of the fan cover 51, and the fan cover side rectifying projection 55 is fixed to the inner surface 52a of the tubular portion 52 connected to the tapered portion 53. Therefore, the fan cover side rectifying projection 55 is arranged immediately downstream of the cooling fan 25 in the air flow direction. The air flowing into the inside of the fan cover 51 collides with the inner surface of the tapered portion 53 due to the rotation of the cooling fan 25, and the air flow direction is changed along the inner surface 52a of the tubular portion 52. Since the fan cover side rectifying projection 55 is arranged immediately downstream of the cooling fan 25, the converted air flow direction is immediately determined by the fan cover side rectifying projection 55. Since the fan cover side rectifying projection 55 divides the space between the inner surface 52a of the tubular portion 52 and the outer surface of the cover member 23 into a plurality of spaces, a plurality of small spaces isolated by the fan cover side rectifying projection 55 The air passing through does not diffuse.

The air whose flow direction is determined in this way does not diffuse, but is a flow path between the first fan cover side rectifying projection 55 and the second fan cover side rectifying projection 55, and the first inverter case side. It flows through the flow path between the rectifying protrusion 56 and the rectifying protrusion 56 on the second inverter case side. In this way, the first fan cover side rectifying protrusion 55 and the second fan cover side rectifying protrusion 55 can determine the direction in which the air flows, so that it is possible to prevent the air from diffusing and flowing. It is possible to suppress the loss of air flow velocity (that is, wind speed). As a result, the cooling fan 25 can improve its cooling performance.

As described above, when the vertical cross-sectional shape of the fan cover side rectifying protrusion 55 is the same as the vertical cross-sectional shape of the inverter case side rectifying protrusion 56, these fan cover side rectifying protrusions 55 and the inverter case side rectifying protrusion 56 are cooling fans. The air due to the rotation of 25 can flow more smoothly.

The height of the fan cover side rectifying protrusion 55 (that is, the distance from the end of the fan cover side rectifying protrusion 55 to the tip of the fan cover side rectifying protrusion 55) is not particularly limited, and the strength of the air flow and the fan cover 51 And / or may be adjusted according to factors such as the shape of the cover member 23. The same applies to the rectifying projection 56 on the inverter case side.

According to the present embodiment, since the fan cover side rectifying protrusion 55 and the inverter case side rectifying protrusion 56 are arranged so as to be aligned with each other, even if the motor frame 11 and the inverter frame 22 are separate members, they are cooled. The fan 25 can generate air that flows linearly by its rotation. The air whose flow direction is determined can smoothly flow to the rear end portion of the motor casing 10, that is, the end cover 12 without impairing the flow velocity. The air for cooling the inverter 20 and the motor 8 can come into contact with the outer surface 22a of the inverter frame 22 and the outer surface 11a of the motor frame 11 to take away the heat generated from the inverter 20 and the heat generated from the motor 8. In this way, the air flowing along the fan cover side rectifying protrusion 55 and the inverter case side rectifying protrusion 56 can cool the inverter case 21 and the motor casing 10, so that the motor 8 and the inverter 20 are efficiently cooled. To.

The fan cover 51 covers the entire cover member 23 without covering the inverter frame 22. Therefore, even if the inverter frame 22 is heated by the heat of the inverter 20, since the outer surface 22a of the inverter frame 22 is in contact with the external space, the air sent by the rotation of the cooling fan 25 effectively heats the inverter frame 22. Can be robbed. This air can smoothly flow to the rear end of the motor casing 10 without becoming hot due to the heat of the inverter 20. When the air becomes hot due to the heat of the inverter 20, it is necessary to increase the size of the cooling fan 25 or increase the rotation speed of the cooling fan 25 in order to effectively cool the motor casing 10. According to the present embodiment, the fan cover side rectifying protrusion 55 and the inverter case side rectifying protrusion 56 suppress the loss of air flow velocity and linearly flow the air flowing in the direction of the axis CL of the drive shaft 5. Since it can be formed, the electric motor assembly 1 does not need to cover the inverter frame 22 with the fan cover 51. Therefore, it is not necessary to increase the size of the cooling fan 25, and it is not necessary to increase the rotation speed of the cooling fan 25.

In one embodiment, the inverter case side rectifying projection 56 may have not only a function for rectifying air but also a function as a heat radiating fin for radiating heat from the inverter 20. In this case, the inverter case side rectifying projection 56 is preferably made of a material having high thermal conductivity. In another embodiment, a single heat radiating fin or a plurality of heat radiating fins different from the inverter case side rectifying protrusion 56 are provided between the first inverter case side rectifying protrusion 56 and the second inverter case side rectifying protrusion 56. It may be arranged. The heat radiation fins extend outward from the outer surface 22a of the inverter frame 22, and are also called inverter case side heat radiation fins.

The electric motor assembly 1 may further include a motor casing side rectifying projection 57 extending outward from the outer surface of the motor casing 10, more specifically, the outer surface 11a of the motor frame 11. In the present embodiment, the motor assembly 1 includes a plurality of motor casing-side rectifying protrusions 57 including a first motor casing-side rectifying protrusion 57 and a second motor casing-side rectifying protrusion 57. In this case, the first motor casing side rectifying protrusion 57 is arranged so as to be aligned with the first fan cover side rectifying protrusion 55 and the first inverter case side rectifying protrusion 56, and is arranged so as to be aligned with the second motor casing. The side rectifying protrusion 57 is arranged so as to be aligned with the second fan cover side rectifying protrusion 55 and the second inverter case side rectifying protrusion 56.

The distance between the first motor casing side rectifying protrusion 57 and the second motor casing side rectifying protrusion 57 is the distance between the first fan cover side rectifying protrusion 55 and the second fan cover side rectifying protrusion 55. It is the same as D1 (see FIG. 10) and the distance D2 (see FIG. 10) between the first inverter case side rectifying protrusion 56 and the second inverter case side rectifying protrusion 56.

In one embodiment, the motor assembly 1 may include a single motor casing side rectifying projection 57. In this case, the motor casing side rectifying projection 57 is aligned with the first fan cover side rectifying projection 55 and the first inverter case side rectifying projection 56, or the second fan cover side rectifying projection 55 and the second It is arranged so as to be aligned with the inverter case side rectifying projection 56 of 2.

Hereinafter, a case where the motor assembly 1 includes a plurality of motor casing-side rectifying projections 57 will be described. Since the configuration of the motor casing side rectifying projection 57, which is not particularly described, is the same as the configuration of the fan cover side rectifying projection 55 and the configuration of the inverter case side rectifying projection 56, the overlapping description will be omitted.

Each of the plurality of motor casing-side rectifying projections 57 extends over the entire motor frame 11. The number of rectifying protrusions 57 on the motor casing side is not limited to this embodiment. The number of rectifying protrusions 57 on the motor casing side may be an even number or an odd number. The plurality of motor casing-side rectifying protrusions 57 are arranged at equal intervals along the circumferential direction of the outer surface 11a of the motor frame 11, and extend outward in the radial direction of the outer surface 11a of the motor frame 11. The plurality of motor casing-side rectifying projections 57 also extend in the axis CL direction of the drive shaft 5. In one embodiment, although not shown, the plurality of motor casing-side rectifying protrusions 57 may be arranged at irregular intervals along the circumferential direction of the outer surface 11a of the motor frame 11.

The number of rectifying protrusions 57 on the motor casing side may be the same as or different from the number of rectifying protrusions 55 on the fan cover side and the number of rectifying protrusions 56 on the inverter case side. By providing the rectifying projection 57 on the motor casing side, the air for cooling the inverter 20 and the motor 8 can more reliably flow to the end cover 12 in a rectified state. Therefore, the cooling fan 25 can cool the inverter 20 and the motor 8 more efficiently via the inverter case 21 and the motor casing 10.

In one embodiment, the motor casing side rectifying projection 57 may have not only a function for rectifying air but also a function as a heat radiating fin for radiating heat from the motor 8. In this case, the motor casing side rectifying projection 57 is preferably made of a material having high thermal conductivity. In another embodiment, the motor assembly 1 may further include motor casing side radiating fins extending outward from the outer surface 11a of the motor frame 11. When the first motor casing side rectifying protrusion 57 and the second motor casing side rectifying protrusion 57 are provided, a single single motor casing side rectifying protrusion 57 is provided between the first motor casing side rectifying protrusion 57 and the second motor casing side rectifying protrusion 57. The heat dissipation fins or a plurality of heat dissipation fins may be arranged.

The inverter frame 22 and the motor frame 11 are connected via a motor bracket 13 so that the inverter case side rectifying projection 56 and the motor casing side rectifying projection 57 are aligned in a straight line. The electric motor assembly 1 includes a positioning structure 60 that determines a relative position between the motor casing 10 and the inverter case 21 so that the inverter case side rectifying protrusion 56 and the motor casing side rectifying protrusion 57 are aligned in a straight line. Hereinafter, the positioning structure 60 will be described.

FIG. 11 is a diagram showing an embodiment of the positioning structure 60. As shown in FIG. 11, the positioning structure 60 includes a first vertical positioning hole 61 formed in the motor frame 11 and the motor bracket 13 and extending in a direction perpendicular to the axis CL direction of the drive shaft 5, an inverter frame 22 and an inverter frame 22. A second vertical positioning hole 62 formed in the motor bracket 13 and extending in a direction perpendicular to the axis CL direction of the drive shaft 5 and inserted into the first vertical positioning hole 61, the relative positions of the motor frame 11 and the motor bracket 13 Is inserted into the first positioning tool 63 for fastening the motor frame 11 and the motor bracket 13 and the second vertical positioning hole 62, and the inverter is inserted while determining the relative position between the inverter frame 22 and the motor bracket 13. A second positioning tool 64 for fastening the frame 22 and the motor bracket 13 is provided.

In this embodiment, a single first vertical positioning hole 61, a single second vertical positioning hole 62, a single first positioning tool 63, and a single second positioning tool 64 are drawn. A plurality of first vertical positioning holes 61, a plurality of second vertical positioning holes 62, a plurality of first positioning tools 63, and a plurality of second positioning tools 64 may be provided.

The plurality of first vertical positioning holes 61 are arranged at equal intervals along the circumferential direction of the motor frame 11 (and the motor bracket 13), and the plurality of second vertical positioning holes 62 are arranged in the inverter frame 22 (and the motor bracket 13). ) Are arranged at equal intervals along the circumferential direction. The number of the first positioning tools 63 corresponds to the number of the first vertical positioning holes 61, and the number of the second positioning tools 64 corresponds to the number of the second vertical positioning holes 62.

An annular convex portion 15 extending outward from the outer surface 13a of the motor bracket 13 is formed on the outer surface 13a of the motor bracket 13. The annular convex portion 15 of the motor bracket 13 is sandwiched between the motor frame 11 and the inverter frame 22.

The first vertical positioning hole 61 includes a through hole 61a formed in the motor frame 11 and a screw hole 61b formed in the motor bracket 13. The through hole 61a is formed at the end of the motor frame 11 on the motor bracket 13 side. The screw holes 61b are formed on the outer surface 13a of the motor bracket 13 on the motor frame 11 side.

The second vertical positioning hole 62 includes a through hole 62a formed in the inverter frame 22 and a screw hole 62b formed in the motor bracket 13. The through hole 62a is formed at the end of the inverter frame 22 on the motor bracket 13 side. The screw holes 62b are formed on the outer surface 13a of the motor bracket 13 on the motor frame 11 side. The screw holes 61b and 62b are located on both sides of the annular convex portion 15.

By inserting the first positioning tool 63 into the through hole 61a and the screw hole 61b in a state where the through hole 61a and the screw hole 61b correspond to each other, the relative position between the motor frame 11 and the motor bracket 13 is determined, and The motor frame 11 and the motor bracket 13 are fastened to each other by the first positioning tool 63. As an example of the first positioning tool 63, a fixing pin or a screw (for example, a set screw) can be mentioned. The first positioning tool 63 may be referred to as a first fastener.

Similarly, the relative position between the inverter frame 22 and the motor bracket 13 is determined by inserting the second positioning tool 64 into the through hole 62a and the screw hole 62b with the through hole 62a and the screw hole 62b corresponding to each other. The inverter frame 22 and the motor bracket 13 are fastened to each other by the second positioning tool 64. As an example of the second positioning tool 64, a fixing pin or a screw (for example, a set screw) can be mentioned. The second positioning tool 64 may be referred to as a second fastener.

When the first positioning tool 63 is inserted into the first vertical positioning hole 61 and the second positioning tool 64 is inserted into the second vertical positioning hole 62, the inverter case side rectifying protrusion 56 and the motor casing side rectifying protrusion 57 are on a straight line. Arranged side by side. According to the present embodiment, since the positioning structure 60 has a simple structure, the assemblability of the electric motor assembly 1 can be improved. By executing a simple assembly method using the positioning structure 60, the operator can assemble the motor assembly 1 so that the inverter case side rectifying projections 56 and the motor casing side rectifying projections 57 are aligned in a straight line. ..

FIG. 12 is a diagram showing another embodiment of the positioning structure 60. As shown in FIG. 12, the positioning structure 60 is formed in the motor frame 11 and the motor bracket 13, and is formed in the first parallel positioning hole 70 extending parallel to the axis CL direction of the drive shaft 5 and the cover member 23. It is provided with a second parallel positioning hole 71 extending parallel to the axis CL direction of the drive shaft 5. The positioning structure 60 is inserted into the first parallel positioning hole 70 and the second parallel positioning hole 71 with the motor bracket 13 and the inverter frame 22 sandwiched between the cover member 23 and the motor frame 11, and the motor casing 10 and the inverter case. It is provided with a through bolt 72 for fastening to 21.

In FIG. 12, a single first parallel positioning hole 70 and a single second parallel positioning hole 71 are drawn, but a plurality of first parallel positioning holes 70 and a plurality of second parallel positioning holes 71 are provided. You may. The plurality of first parallel positioning holes 70 are arranged at equal intervals along the circumferential direction of the motor frame 11 (and the motor bracket 13), and the plurality of second parallel positioning holes 71 are arranged in the circumferential direction of the cover member 23. They are evenly spaced along. The number of through bolts 72 corresponds to the number of first parallel positioning holes 70 or the number of second parallel positioning holes 71.

As shown in FIG. 12, the first parallel positioning hole 70 includes a screw hole 70a formed at the end of the motor frame 11 on the motor bracket 13 side and a through hole 70b formed in the annular convex portion 15 of the motor bracket 13. And have. The second parallel positioning hole 71 is a through hole formed at the outer peripheral end of the cover member 23. In the present embodiment, the screw hole 70a and the through hole 70b are made to correspond to each other, and the screw hole 70a and the through hole 70b (that is, the first parallel positioning hole 70) and the second parallel positioning hole 71 are made to correspond to each other. By inserting the through bolt 72 into the first parallel positioning hole 70 and the second parallel positioning hole 71, the relative positions of the cover member 23, the inverter frame 22, the motor bracket 13, and the motor frame 11 are determined. Further, the through bolt 72 can fasten the cover member 23, the inverter frame 22, the motor bracket 13, and the motor frame 11 by pressing the cover member 23 against the inverter frame 22 at its head.

When the through bolt 72 is inserted into the first parallel positioning hole 70 and the second parallel positioning hole 71, the inverter case side rectifying projection 56 and the motor casing side rectifying projection 57 are arranged side by side in a straight line. Also in this embodiment, since the positioning structure 60 has a simple structure, the assemblability of the electric motor assembly 1 can be improved. The operator aligns the inverter case side rectifying protrusion 56 and the motor casing side rectifying protrusion 57 in a straight line by a simple method of inserting a through bolt 72 into the first parallel positioning hole 70 and the second parallel positioning hole 71. The electric motor assembly 1 can be assembled in parallel.

The cover member 23 to which the heat of the inverter 20 is transferred and the motor frame 11 to which the heat of the motor 8 is transferred are connected to each other via a through bolt 72. In one embodiment, the through bolt 72 may be made of a material having high thermal conductivity. With such a configuration, the through bolt 72 can transfer the heat of the member on the high temperature side (that is, the inverter frame 22 or the motor frame 11) to the member on the low temperature side (that is, the inverter frame 22 or the motor frame 11). Therefore, the through bolt 72 can make the temperature of the motor frame 11 uniform with the temperature of the inverter frame 22.

Since the through bolt 72 is arranged outside the inverter frame 22 and is exposed to the external space, the cooling fan 25 can directly bring the air sent by its rotation into contact with the through bolt 72. Therefore, the cooling fan 25 can cool the inverter frame 22 and the motor frame 11 via the through bolt 72. That is, the through bolt 72 can function as a heat radiating member.

In other embodiments, the through bolt 72 may be made of a material having low thermal conductivity. In this case, the through bolt 72 means that the heat of the high temperature side member (that is, the inverter frame 22 or the motor frame 11) is transferred to the low temperature side member (that is, the inverter frame 22 or the motor frame 11) through itself. It can be blocked.

FIG. 13 is a diagram showing still another embodiment of the positioning structure 60. As shown in FIG. 13, the positioning structure 60 is formed in a first protrusion 80 formed on the motor bracket 13 and extending toward the motor frame 11, and a first fitting formed on the motor frame 11 into which the first protrusion 80 is fitted. It includes a joint groove 81, a second protrusion 82 formed on the motor bracket 13 and extending toward the inverter frame 22, and a second fitting groove 83 formed on the inverter frame 22 into which the second protrusion 82 is fitted. ..

As shown in FIG. 13, the first protrusion 80 and the second protrusion 82 are formed on the annular convex portion 15 of the motor bracket 13 and extend parallel to the axis CL direction of the drive shaft 5. The first fitting groove 81 is formed on the end surface of the motor frame 11 on the motor bracket 13 side, and extends parallel to the axis CL direction of the drive shaft 5. The second fitting groove 83 is formed on the end surface of the inverter frame 22 on the motor bracket 13 side, and extends parallel to the axis CL direction of the drive shaft 5.

In the embodiment shown in FIG. 13, a single first protrusion 80, a single second protrusion 82, a single first fitting groove 81, and a single second fitting groove 83 are drawn. , A plurality of first protrusions 80, a plurality of second protrusions 82, a plurality of first fitting grooves 81, and a plurality of second fitting grooves 83 may be provided.

Also in this embodiment, the first protrusion 80 of the motor bracket 13 is fitted into the first fitting groove 81 of the motor frame 11, and the second protrusion 82 of the motor bracket 13 is fitted into the second fitting groove 83 of the inverter frame 22. When fitted, the inverter case side rectifying protrusion 56 and the motor casing side rectifying protrusion 57 are arranged side by side in a straight line.

The configuration of the positioning structure 60 is not limited to the above-described embodiment. The positioning structure 60 has another configuration if the relative positions of the inverter frame 22 and the motor frame 11 can be determined so that the inverter case side rectifying projection 56 and the motor casing side rectifying projection 57 are aligned in a straight line. You may.

FIG. 14 is a diagram showing another embodiment of the electric motor assembly 1. Since the configuration of the present embodiment not particularly described is the same as that of the above-described embodiment, the duplicated description will be omitted. In the embodiment shown in FIG. 14, the fan cover 51 covers the inverter case 21 (more specifically, the inverter frame 22) and the motor casing 10 (more specifically, the motor frame 11). In the embodiment shown in FIG. 14, the fan cover 51 may be referred to as a tubular fan cover.

As shown in FIG. 14, the tubular portion 52 of the fan cover 51 extends to the motor portion 2 along the axis CL direction of the drive shaft 5. The tubular portion 52 may cover at least a part of the motor casing 10 (motor frame 11 in this embodiment). In the embodiment shown in FIG. 14, the tubular portion 52 covers the entire inverter frame 22, and one end of the tubular portion 52 is adjacent to the end cover 12. In one embodiment, the tubular portion 52 may cover not only the motor frame 11 but also the end cover 12.

According to the embodiment shown in FIG. 14, the fan cover 51 can secure an air flow path to the end portion (that is, the load side) of the motor casing 10, and the air flowing by the rotation of the cooling fan 25 becomes more volatile. It surely flows linearly (see the arrow in FIG. 14). Therefore, the motor 8 and the inverter 20 are cooled more effectively.

FIG. 15 is a diagram showing still another embodiment of the electric motor assembly 1. Since the configuration of the present embodiment not particularly described is the same as that of the above-described embodiment, the duplicated description will be omitted. In the embodiment shown in FIG. 15, the fan cover 51 is a fan housing 84 which is a combination of a tubular portion 52 and a tapered portion 53, and a fan frame 85 connected to the fan housing 84 (more specifically, the tubular portion 52). And have.

The fan frame 85 is a tubular member extending parallel to the axis CL direction of the drive shaft 5, and is a member separate from the fan housing 84. With such a structure, the fan housing 84 and the fan frame 85 may be made of different materials.

For example, the fan housing 84 may be made of a metal having a high thermal conductivity (for example, aluminum, iron, or copper), and the fan frame 85 may be made of a resin. With such a combination, the overall cost of the fan cover 51 can be reduced and the weight can be reduced. The combination of the material of the fan housing 84 and the material of the fan frame 85 is not limited to the above-described embodiment. Any material may be selected as the material of the fan housing 84 and the fan frame 85.

In the drawings described below, the same or corresponding components are designated by the same reference numerals and duplicate description will be omitted. In the plurality of embodiments described below, the configuration of one embodiment not particularly described is the same as that of the other embodiments, and thus the duplicated description will be omitted.

FIG. 16 is a cross-sectional view showing still another embodiment of the electric motor assembly 201. The electric motor assembly 201 is a mechanical device having an integrated structure in which an inverter 220 is built. As shown in FIG. 16, the electric motor assembly 201 includes a motor unit 202 and an inverter unit 203. The electric motor assembly 201 accommodates a drive shaft 205, a motor (rotating element) 208 including a rotor 206 for rotating the drive shaft 205 and a stator (stator) 207, and a rotor 206 and a stator 207. The motor casing 210, the inverter 220 which is arranged adjacent to the rotor 206 and the stator 207 and controls the operation (rotational speed) of the motor 208, and the inverter 220 are housed and along the axis CL direction of the drive shaft 205. It includes an inverter case 221 arranged in series with the motor casing 210.

The drive shaft 205 extends through the motor casing 210 and the inverter case 221, and the motor casing 210 and the inverter case 221 are arranged concentrically with the drive shaft 205. In the present embodiment, since the motor casing 210 and the inverter case 221 are arranged in series in the axis CL direction of the drive shaft 205, the electric motor assembly 201 can have a compact structure. A cooling fan 225 arranged concentrically with the drive shaft 205 is fixed to the end of the drive shaft 205 (that is, the counterload side of the drive shaft 205). The cooling fan 225 is arranged outside the inverter case 221 and is adjacent to the inverter case 221.

A motor 208, which is a heat generating source, is arranged inside the motor casing 210. The motor 208 surrounds the rotor 206 fixed to the drive shaft 205 and the stator (stator) that forms a rotating magnetic field by receiving electric power from the outside (not shown) by the winding (coil) 207b. ) 207 and. The stator 207 includes a stator core 207a and a plurality of windings 207b wound around the stator core 207a. The rotor 206 is rotated by a rotating magnetic field formed between the rotor 206 and the stator 207, and the drive shaft 205 to which the rotor 206 is fixed rotates together with the rotor 206.

In FIG. 16, the motor 208 is schematically depicted. The motor 208 is, for example, a permanent magnet type motor using a permanent magnet in the rotor. However, the motor 208 is not limited to the permanent magnet type motor, and may be various types of motors such as an induction motor and an SR motor.

The motor casing 210 includes a motor frame 211 to which the stator 207 is fixed, an end cover 212 in which one open end of the motor frame 211 is closed and a through hole 230 through which the drive shaft 205 penetrates is formed, and the motor frame 211. It is provided with a motor side plate (inverter case side bracket) 213 in which the other open end of the motor is closed and a through hole 231 through which the drive shaft 205 penetrates is formed. The end cover 212 and the motor side plate 213 face each other with the motor 208 interposed therebetween. The drive shaft 205 is rotatably supported by a bearing 227 supported by a bearing support portion 232 of the end cover 212 and a bearing 228 supported by a bearing support portion 233 of the motor side plate 213.

The inverter case 221 surrounds the inverter 220, in other words, an inverter frame 222 arranged around the inverter 220, a cooling fan side cover member (cooling fan side bracket) 223 that closes one open end of the inverter frame 222, and the like. It includes a motor casing side cover member (motor casing side bracket) 224 that closes the other open end of the inverter frame 222. The cooling fan side cover member 223 is adjacent to the cooling fan 225 and has a through hole 239 through which the drive shaft 205 penetrates. The motor casing side cover member 224 is adjacent to the motor casing 210, more specifically, the motor side plate 213, and has a through hole 240 through which the drive shaft 205 penetrates. The inverter frame 222 is sandwiched between the cooling fan side cover member 223 and the motor casing side cover member 224, and is connected to both the cooling fan side cover member 223 and the motor casing side cover member 224.

The connection structure between the inverter frame 222 and the cooling fan side cover member 223 and the connection structure between the inverter frame 222 and the motor casing side cover member 224 are not particularly limited. In one embodiment, the inverter frame 222 and the cooling fan side cover member 223 may have a structure in which they are fitted to each other. Similarly, the inverter frame 222 and the motor casing side cover member 224 may have a structure in which they are fitted to each other.

A plurality of cooling fins 256 extending outward are formed on the outer surface of the inverter frame 222. These plurality of cooling fins 256 extend in the axis CL direction of the drive shaft 205. The inverter case 221 (more specifically, the inverter frame 222) is cooled by contact of air sent by the rotation of the cooling fan 225 with the cooling fins 256, and the inverter 220 is cooled through the inverter case 221.

A plurality of cooling fins 257 extending outward are formed on the outer surface of the motor frame 211. These plurality of cooling fins 257 extend in the axis CL direction of the drive shaft 205. The motor casing 210 (more specifically, the motor frame 211) is cooled by contact of the air sent by the cooling fan 225 with the cooling fins 257, and the motor 208 is cooled via the motor casing 210.

The electric motor assembly 201 includes an inverter case 221 so as to cover the cooling fan 225, and more specifically, a fan cover 251 connected to the cooling fan side cover member 223. The fan cover 251 is a member for guiding the air sent by the rotation of the cooling fan 225 while preventing the human finger from coming into contact with the cooling fan 225. The fan cover 251 is arranged so as to cover the cooling fan side cover member 223, and is fixed to the cooling fan side cover member 223. The fan cover 251 has an opening 251a formed on the surface of the fan cover 251 facing the cooling fan 225.

The fan cover 251 includes a tubular portion 252 to which the cooling fan side cover member 223 is fixed, and a tapered portion (that is, a fan case portion) 253 connected to the tubular portion 252. In the present embodiment, the tubular portion 252 and the tapered portion 253 are integrally molded members. One end of the tubular portion 252 is fixed to the cooling fan side cover member 223. One end of the tubular portion 252 is a portion of the tubular portion 252 on the inverter case 221 side. The tapered portion 253 is connected to the other end of the tubular portion 252. The other end of the tubular portion 252 is a portion opposite to one end of the tubular portion 252. The tapered portion 253 has a shape in which the diameter gradually decreases as the diameter increases from the tubular portion 252. An opening 251a is formed on the end surface of the tapered portion 253. In one embodiment, the tapered portion 253 does not have to have a tapered shape.

A plurality of fins 236 are formed on the outer surface of the cooling fan side cover member 223. These fins 236 are adjacent to the cooling fan 225 and extend from the outer surface of the cooling fan side cover member 223 toward the cooling fan 225. The cooling fan side cover member 223 and the motor casing side cover member 224 are arranged concentrically with the drive shaft 205. The through hole 239 is formed in the center of the cooling fan side cover member 223, and the through hole 240 is formed in the center of the motor casing side cover member 224. The drive shaft 205 extends to the outside of the cooling fan side cover member 223 through these through holes 239 and 240.

The inverter 220 is arranged inside the inverter case 221. The inverter 220 includes an inverter element 241 including elements such as a switching element and a capacitor, and a substrate 242 on which the inverter element 241 is mounted. The substrate 242 is fixed to the inner surface of the cooling fan side cover member 223. The inner surface of the cooling fan side cover member 223 is a surface opposite to the outer surface of the cooling fan side cover member 223 on which the fins 236 are formed. The cooling fan side cover member 223 has a saucer shape on which the substrate 242 is placed. With such a structure, the cooling fan side cover member 223 can be filled with a resin for heat dissipation and surface protection of the substrate 242.

In the present embodiment, the motor casing 210 and the inverter case 221 are made of separate members. The motor side plate 213 and the motor frame 211 are separate members, and the motor side plate 213 is removable from the motor frame 211. Therefore, the operator can easily replace the bearing 228 without pulling out the rotor 206 from the end cover 212 side. That is, such a structure can improve the maintainability of the electric motor assembly 201.

In this embodiment, the components of the motor casing 210 (that is, the motor frame 211, the end cover 212, and the motor side plate 213) and the components of the inverter case 221 (that is, the inverter frame 222, the cooling fan side cover member 223, and the motor). The casing side cover member 224) is composed of separate members. Therefore, a material suitable for the purpose can be applied to each of the components of the motor casing 210 and the components of the inverter case 221.

Each of the motor 208 and the inverter 220 is a heat source. Therefore, for example, when considering the heat dissipation of the motor 208 and the inverter 220, it is preferable to use aluminum (Al) having a high thermal conductivity as the material of the motor frame 211 and the inverter frame 222. However, in order to avoid insufficient strength of the motor frame 211 and the inverter frame 222, the thickness of the motor frame 211 and the thickness of the inverter frame 222 tend to be thick. As a result, the accommodation space of the motor 208 and the inverter 220 may be reduced.

On the other hand, when the material of the motor frame 211 and the material of the inverter frame 222 are iron materials, the thickness of the motor frame 211 and the inverter are compared with the case where the material of the motor frame 211 and the material of the inverter frame 222 are aluminum materials. The thickness of the frame 222 can be reduced. However, since iron has a lower thermal conductivity than aluminum, the heat dissipation of the heat source may be inferior. Therefore, the material of the motor frame 211 that requires the accommodation space of the motor 208 and the material of the inverter frame 222 that requires the accommodation space of the inverter 220 may be iron materials.

The electric motor assembly 201 further includes a tubular wall 250 extending in the axis CL direction of the drive shaft 205 so as to cover the periphery of the drive shaft 205. The tubular wall 250 is a member that forms a flow path 280 of air that flows by the rotation of the cooling fan 225 while separating the drive shaft 205 and the inverter 220, and is arranged inside the inverter case 221. The tubular wall 250 has a cylindrical shape and is arranged concentrically with the drive shaft 205. The shape of the tubular wall 250 is not particularly limited. In one embodiment, the tubular wall 250 may have a polygonal tubular shape. A connection line (not shown) that electrically connects the inverter 220 (that is, the inverter element 241 and the substrate 242) and the inverter 220 and the winding 207b of the stator 207 is provided between the tubular wall 250 and the inverter case 221. It is located in an isolated space.

The substrate 242 has an annular shape through which the drive shaft 205 and the tubular wall 250 penetrate, and is arranged concentrically with the drive shaft 205. By providing the tubular wall 250, it is possible to prevent the connection wire from being caught in the drive shaft 205 and coming into contact with the drive shaft 205 of the inverter element 241. As a result, failure of the inverter 220 can be reliably prevented.

FIG. 17 is a diagram showing a connection structure of the air flow path 280 and the tubular wall 250 to the inverter case 221. The air flow path 280 is an axial through hole formed inside the tubular wall 250 and is adjacent to the cooling fan 225. The tubular wall 250 includes one end 250a connected to the through hole 239 of the cooling fan side cover member 223, the other end 250b connected to the through hole 240 of the motor casing side cover member 224, one end 250a, and the like. It is connected to the end portion 250b and includes a main body portion 250c extending in the axis CL direction of the drive shaft 205. One end 250a of the tubular wall 250 is a portion including an opening end surface of the tubular wall 250 on the cooling fan 225 side and a peripheral surface (outer peripheral surface and inner peripheral surface) of the tubular wall 250 connected to the opening end surface. Is. The other end 250b of the tubular wall 250 includes an opening end surface of the tubular wall 250 on the motor side plate 213 side and a peripheral surface (outer peripheral surface and inner peripheral surface) of the tubular wall 250 connected to the opening end surface. It is a part.

In the embodiment shown in FIG. 17, the tubular wall 250, the cooling fan side cover member 223, and the motor casing side cover member 224 are separate members. Therefore, an annular seal member 258 is arranged between one end 250a of the tubular wall 250 and the through hole 239 of the cooling fan side cover member 223. An annular seal member 259 is arranged between the other end 250b of the tubular wall 250 and the through hole 240 of the motor casing side cover member 224. These sealing members 258 and 259 are, for example, O-rings.

As shown in FIG. 17, an annular groove 239a in which the seal member 258 is mounted is formed in the through hole 239 of the cooling fan side cover member 223, and the through hole 240 of the motor casing side cover member 224 is sealed. An annular groove 240a on which the member 259 is mounted is formed. The tubular wall 250 is connected to the cooling fan side cover member 223 and the motor casing side cover member 224 in a state where the sealing members 258 and 259 are attached to the annular grooves 239a and 240a, respectively.

The seal member 258 seals the gap between the cooling fan side cover member 223 and the tubular wall 250, and the seal member 259 seals the gap between the motor casing side cover member 224 and the tubular wall 250. The sealing members 258 and 259 can prevent foreign matter such as dust or water droplets from entering the space where the inverter 220 is arranged, and as a result, prevent the inverter 220 from failing due to the foreign matter adhering to the inverter 220. can do.

In one embodiment, the tubular wall 250 is cooled so that one of the open end faces is in close contact with the inner surface of the cooling fan side cover member 223 and the other open end face is in close contact with the inner surface of the motor casing side cover member 224. It may be connected to the fan side cover member 223 and the motor casing side cover member 224. The inner surface of the motor casing side cover member 224 is a surface opposite to the outer surface of the motor casing side cover member 224 facing the motor side plate 213. Also in this embodiment, one end 250a of the tubular wall 250 is connected to the through hole 239 of the cooling fan side cover member 223, and the other end 250b of the tubular wall 250 is the through hole 240 of the motor casing side cover member 224. It is connected to the. The seal member 258 is arranged between one open end surface of the tubular wall 250 and the inner surface of the cooling fan side cover member 223, and the seal member 259 is the other open end surface of the tubular wall 250 and the motor casing side cover member 224. It is placed between the inner surface.

Although not shown, a sealing member is arranged in each of the gap between the through hole 230 of the end cover 212 and the drive shaft 205 and the gap between the through hole 231 of the motor side plate 213 and the drive shaft 205. .. Each of these sealing members can prevent foreign matter from entering the space in which the motor 208 is arranged, and as a result, prevent the motor 208 from failing due to the foreign matter adhering to the motor 208. ..

In one embodiment, the tubular wall 250 may be an integrally molded member with any one of the cooling fan side cover member 223 and the motor casing side cover member 224. FIG. 18 is a diagram showing a cooling fan side cover member 223 and a tubular wall 250 integrally configured. FIG. 19 is a diagram showing a motor casing side cover member 224 and a tubular wall 250 integrally configured.

As shown in FIG. 18, when the cooling fan side cover member 223 and the tubular wall 250 are integrally molded members, the sealing member 258 is not provided, and the tubular wall 250 and the motor casing side cover member 224 are combined. A seal member 259 is provided between them. As shown in FIG. 19, when the tubular wall 250 and the motor casing side cover member 224 are integrally molded members, the seal member 259 is not provided, and the tubular wall 250 and the cooling fan side cover member 223 are combined. A seal member 258 is provided between them. In the embodiment shown in FIGS. 18 and 19, since any one of the seal members 258 and 259 is not required, the number of component parts of the electric motor assembly 201 is reduced, and the electric motor assembly 201 by the operator The number of assembly steps is reduced.

As shown in FIG. 16, the motor assembly 201 includes a cooling fan side cover member 223, an inverter frame 222, a motor casing side cover member 224, a spacer 270 described later, a motor side plate 213, a motor frame 211, and an end cover 212. Assembled in order. In one embodiment, the motor assembly 201 may be assembled by fasteners that are a combination of through bolts and nuts.

For example, an insertion hole into which a through bolt is inserted is formed in each of the peripheral edge of the cooling fan side cover member 223, the peripheral edge of the motor side plate 213, and the peripheral edge of the end cover 212. The operator may screw a nut into the through bolts inserted into the insertion holes and tighten the fasteners in the direction in which the cooling fan side cover member 223 and the end cover 212 are close to each other.

In this way, the components of the motor assembly 201 (cooling fan side cover member 223, inverter frame 222, motor casing side cover member 224, spacer 270, motor side plate 213, motor frame 211, and end cover 212) are fasteners. When tightly fastened by the motor, the airtightness of the isolated space in which the inverter 220 is arranged and the airtightness of the isolated space in which the motor 208 is arranged are improved. The isolated space in which the inverter 220 is arranged is a space surrounded by the tubular wall 250, the cooling fan side cover member 223, the motor casing side cover member 224, and the inverter frame 222. The isolated space in which the motor 208 is arranged is a space surrounded by the motor side plate 213, the motor frame 211, and the end cover 212.

As shown in FIG. 16, the electric motor assembly 201 includes a spacer 270 interposed between the motor casing 210 and the inverter case 221. The spacers 270 are arranged between the motor casing side cover member 224 and the motor side plate 213, and a plurality of protruding members arranged at equal intervals along the circumferential direction of the motor side plate 213 (or the motor casing side cover member 224). It has 260. These plurality of protruding members 260 form an annular communication space 281 that communicates the air flow path 280 and the external space of the motor assembly 201 with the motor casing 210 (more specifically, the motor side plate 213) and the inverter case 221 (more specifically, the motor side plate 213). More specifically, it is formed between the motor casing side cover member 224).

Each protrusion 260 extends in the axis CL direction of the drive shaft 205 and is connected to both the motor casing side cover member 224 and the motor side plate 213. The connection structure of the protrusion member 260 is not particularly limited. In one embodiment, the protrusion member 260 and at least one of the motor casing side cover member 224 and the motor side plate 213 may be connected by means such as adhesive, welding, and fitting. In another embodiment, the protrusion member 260, the motor casing side cover member 224, and any one of the motor side plate 213 may be integrally molded members.

When the motor assembly 201 is assembled with the plurality of protrusion members 260 in contact with both the motor casing side cover member 224 and the motor side plate 213, each protrusion member 260 has the motor casing side cover member 224 and the motor side plate. Adheres to both 213. As a result, a communication space 281 perpendicular to the axis CL direction of the drive shaft 205, that is, the flow path 280 extending parallel to the drive shaft 205 is formed between the motor casing side cover member 224 and the motor side plate 213. Ru. The distance between the motor casing side cover member 224 and the motor side plate 213 corresponds to the thickness of the protrusion member 260 (that is, the length of the protrusion member 260 in the axis CL direction).

FIG. 20 is a cross-sectional view taken along the line AA of FIG. FIG. 21 is a perspective view of a part of the electric motor assembly 201. In FIGS. 20 and 21, the cooling fins 256 are not shown. In FIG. 21, the elements of the motor unit 202 excluding the motor side plate 213 are not shown, and the components of the motor assembly 201 are schematically drawn.

The plurality of protruding members 260 are arranged at equal intervals along the circumferential direction of the drive shaft 205 (or the tubular wall 250), in other words, the motor side plate 213 (or the motor casing side cover member 224). In this embodiment, four protruding members 260 are provided. However, the number of the protrusion members 260 is not limited to this embodiment as long as the communication space 281 can communicate with the external space of the electric motor assembly 201.

As shown in FIGS. 16 to 20, the air flow path 280 formed between the outer peripheral surface of the drive shaft 205 and the inner peripheral surface of the tubular wall 250 communicates with the communication space 281. The flow path 280 communicates with the external space (first external space) in which the cooling fan 225 is arranged, and the communication space 281 communicates with the external space (second external space) located outside in the radial direction thereof. Therefore, the first external space and the second external space communicate with each other via the flow path 280 and the communication space 281.

FIG. 22 is a diagram showing a flow of air sent by the rotation of the cooling fan 225. As shown in FIG. 22, when the cooling fan 225 rotates with the rotation of the drive shaft 205, the air around the opening 251a of the fan cover 251 passes through the opening 251a and is sucked into the inside of the fan cover 251. A part of the air flowing into the inside of the fan cover 251 collides with the inner surface of the fan cover 251 and is changed in direction, and flows along the outer surface of the inverter frame 222 and the outer surface of the motor frame 211. This air contacts the outer surface of the inverter frame 222 and the cooling fins 256 to take heat generated from the inverter 220, and further contacts the outer surface of the motor frame 211 and the cooling fins 257 to take away the heat generated from the motor 208. ..

The tubular wall 250 is opened in a space (first external space) in which the cooling fan 225 is arranged and a communication space 281. Other parts of the air that have flowed into the fan cover 251 come into contact with the fins 236 of the cooling fan side cover member 223 to indirectly cool the inverter 220, and the tubular wall 250 through the opening of the tubular wall 250. It flows inside. The air in the tubular wall 250 flows through the flow path 280 along the axis CL direction of the drive shaft 205.

In one embodiment, the tubular wall 250 is preferably made of a material having high thermal conductivity. An example of a material having high thermal conductivity is copper (Cu) or aluminum. In this case, since the tubular wall 250 is in contact with the air in the isolated space where the inverter 220 is arranged, the heat generated from the inverter 220 is transferred to the tubular wall 250, and the tubular wall 250 becomes hot. Since the air flowing through the flow path 280 in the tubular wall 250 can take away the heat generated from the inverter 220, the inverter 220 is indirectly cooled through the tubular wall 250.

In one embodiment, heat radiation fins may be formed on the inner peripheral surface of the tubular wall 250. The number of heat radiation fins may be singular or plural. The air flowing through the flow path 280 can come into contact with the inner peripheral surface of the tubular wall 250 and the heat radiating fins to remove the heat generated from the inverter 220. The heat radiating fin may extend in the axis CL direction of the drive shaft 205. The heat radiation fins extending in the CL direction of the axis can smoothly guide the air flow in the flow path 280.

An axial fan or a centrifugal fan is adopted as the cooling fan 225. When the cooling fan 225 is a centrifugal fan, the blades of the cooling fan 225 may have an inclined shape so that a part of the air sent by the rotation of the cooling fan 225 flows into the inside of the tubular wall 250. Good. The cooling fan 225 may be a combination of different types of fans or a combination of fans of the same type.

Since the flow path 280 and the communication space 281 are connected to each other, the air passing through the flow path 280 flows into the communication space 281 and flows to the external space through the gap between the protrusions 260 adjacent to each other. The gap between the protrusion members 260 forms a part of the communication space 281.

In the present embodiment, the motor casing side cover member 224 is made of a material having high thermal conductivity. Since the motor casing side cover member 224 is in contact with the air in the isolated space where the inverter 220 is arranged, the heat of the inverter 220 is transferred to the motor casing side cover member 224, and the motor casing side cover member 224 becomes hot. The air that has flowed into the communication space 281 comes into contact with the motor casing side cover member 224 and flows to the external space while taking heat generated from the inverter 220.

The inverter case 221 includes not only the cooling fan side cover member 223 and the inverter frame 222, but also the motor casing side cover member 224. A plurality of protruding members 260 interposed between the motor casing side cover member 224 and the motor side plate 213 form a communication space 281. Therefore, the cooling fan 225 can send the air around it to the external space of the motor assembly 201 via the flow path 280 and the communication space 281. The air flowing by the rotation of the cooling fan 225 not only takes heat of the inverter 220 by contacting the outer surface of the cooling fan side cover member 223 and the outer surface of the inverter frame 222, but also by contacting the outer surface of the motor casing side cover member 224. Can also take away the heat of the inverter 220. According to the present embodiment, since the electric motor assembly 201 includes a tubular wall 250 forming an air flow path 280 and a spacer 270 forming a communication space 281, the space in which the inverter 220 is arranged is provided. It can be cooled positively. Therefore, the electric motor assembly 201 can effectively reduce the temperature of the inverter 220 through the cooling of this space. In the present embodiment, the electric motor assembly 201 can increase the contact area of the inverter case 221 with air. Therefore, the electric motor assembly 201 can effectively reduce the temperature of the inverter 220.

As the material of the protrusion member 260 and the material of the motor side plate 213, a material having a high thermal conductivity or a material having a low thermal conductivity is selected. As an example of a material having a low thermal conductivity, iron, stainless steel, or resin can be mentioned.

In one embodiment, both the protrusion member 260 and the motor side plate 213 may be made of a material having high thermal conductivity. With such a configuration, the heat of the motor 208 is transferred to the motor side plate 213, and further transferred to the motor casing side cover member 224 via the protrusion member 260. Therefore, the temperature of the motor side plate 213 and the temperature of the motor casing side cover member 224 become uniform.

The bearing 228 is supported by the bearing support portion 233 of the motor side plate 213, and frictional heat is generated in the bearing 228 by the rotation of the drive shaft 205. Therefore, when the motor side plate 213 is made of a material having high thermal conductivity, the heat of the bearing 228 is also transferred to the motor side plate 213. The air that has passed through the flow path 280 and has flowed into the communication space 281 comes into contact with not only the motor casing side cover member 224 but also the motor side plate 213. Since the temperature of the motor side plate 213 and the temperature of the motor casing side cover member 224 are uniform via the protrusion member 260, the cooling fan 225 makes the motor side plate 213 and the motor casing side cover member 224 uniform by the air flowing through the communication space 281. Can be cooled to.

In another embodiment, the protrusion member 260 is made of a material having a high thermal conductivity, and the motor side plate 213 is made of a material having a low thermal conductivity. In still another embodiment, both the protrusion member 260 and the motor side plate 213 are made of a material having low thermal conductivity. With such a configuration, the heat of the motor 208 is not transferred to the motor side plate 213, and as a result, the inverter 220 is not affected by the heat of the motor 208.

In still another embodiment, the protrusion member 260 is made of a material having a low thermal conductivity, and the motor side plate 213 is made of a material having a high thermal conductivity. With such a configuration, the protrusion member 260 that functions as a heat insulating material is not affected by the heat of the motor side plate 213, and the heat of the motor side plate 213 is not transferred to the motor casing side cover member 224. Therefore, the inverter 220 is not affected by the heat of the motor 208. Since the motor side plate 213 is made of a material having high thermal conductivity, the cooling fan 225 can cool the motor side plate 213 by the air flowing through the communication space 281.

FIG. 23 is a perspective view showing another embodiment of the spacer 270. The spacer 270 is provided between the motor casing side cover member 224 and the motor side plate 213, and includes a ring member 265 in which a communication space 281 is formed. The ring member 265 has a hollow shape and has air holes 266 that form a part of the communication space 281.

As shown in FIG. 23, a through hole 267 through which the drive shaft 205 penetrates is formed in the center of the ring member 265, and the drive shaft 205 passes through the through hole 267. The ring member 265 is arranged perpendicular to the drive shaft 205, and is arranged concentrically with the motor casing 210, the inverter case 221 and the drive shaft 205. Since the through hole 267 of the ring member 265 is larger than the outer peripheral surface of the drive shaft 205 and does not contact the drive shaft 205, the ring member 265 does not rotate together with the drive shaft 205.

The ring member 265 includes both end faces 265a and 265b perpendicular to the drive shaft 205, and an outer peripheral end face 265c extending between these both end faces 265a and 265b. The outer peripheral end surface 265c extends in the axis CL direction of the drive shaft 205. The plurality of air holes 266 are formed in the outer peripheral end surface 265c of the ring member 265. The number of air holes 266 is not limited to this embodiment. In one embodiment, the number of air holes 266 may be at least one. As shown in FIG. 23, the plurality of air holes 266 are arranged at equal intervals along the circumferential direction of the ring member 265. Since the air hole 266 forms a part of the communication space 281, the air that has passed through the flow path 280 flows to the external space through the air hole 266.

FIG. 24 is a diagram showing still another embodiment of the electric motor assembly 201. Since the configuration of the present embodiment not particularly described is the same as that of the above-described embodiment, the duplicated description will be omitted. In the embodiment shown in FIG. 24, the fan cover 251 covers the inverter case 221 (more specifically, the inverter frame 222) and the motor casing 210 (more specifically, the motor frame 211). In the embodiment shown in FIG. 24, the fan cover 251 may be referred to as a tubular fan cover.

As shown in FIG. 24, the tubular portion 252 of the fan cover 251 extends to the motor portion 202 along the axis CL direction of the drive shaft 205. The tubular portion 252 may cover at least a part of the motor casing 210 (motor frame 211 in this embodiment). In the embodiment shown in FIG. 24, the tubular portion 252 covers the entire inverter frame 222, and one end of the tubular portion 252 is adjacent to the end cover 212. In one embodiment, the tubular portion 252 may cover not only the motor frame 211 but also the end cover 212.

According to the embodiment shown in FIG. 24, the fan cover 251 can secure an air flow path to the end portion (that is, the load side) of the motor casing 210, and the air flowing by the rotation of the cooling fan 225 becomes more squeezed. It surely flows linearly (see arrow A1 in FIG. 24). Therefore, the motor 208 and the inverter 220 are cooled more effectively.

Further, according to the embodiment shown in FIG. 24, the flow path is in a negative pressure state due to the linearly flowing air. The fan cover 251 can exert the ejector effect generated by this negative pressure. Therefore, the flow velocity of the air flowing through the communication space 281 (see arrow B1 in FIG. 24) increases due to the ejector effect, and as a result, the motor 208 and the inverter 220 are cooled more effectively.

In FIG. 24, when the cooling fan 25 has a structure for forming an air flow from the inverter case 221 to the motor casing 210, the cooling fan 25 draws air in the direction indicated by the arrow A1 and the direction indicated by the arrow B1. Form. When the cooling fan 25 has a structure for forming an air flow from the motor casing 210 to the inverter case 221, the cooling fan 25 forms the air in the direction indicated by the arrow A2 and the direction indicated by the arrow B2.

FIG. 25 is a diagram for explaining the effect of the fan cover according to the embodiment shown in FIG. 24. As shown in FIG. 25, the tubular portion 252 of the fan cover 251 is arranged around the spacer 270 and covers the spacer 270. Since the communication space 281 is surrounded by the tubular portion 252 of the fan cover 251, the fan cover 251 can prevent foreign matter from entering the communication space 281.

FIG. 26 is a diagram showing still another embodiment of the electric motor assembly 201. Since the configuration of the present embodiment not particularly described is the same as that of the above-described embodiment, the duplicated description will be omitted. In the embodiment shown in FIG. 26, the fan cover 251 has a fan housing 284 which is a combination of a tubular portion 252 and a tapered portion 253, and a fan frame 285 connected to the fan housing 284 (more specifically, the tubular portion 252). And have.

The fan frame 285 is a tubular member extending parallel to the axis CL direction of the drive shaft 205, and is a member separate from the fan housing 284. With such a structure, the fan housing 284 and the fan frame 285 may be made of different materials.

For example, the fan housing 284 may be made of a metal having a high thermal conductivity (for example, aluminum, iron, or copper), and the fan frame 285 may be made of a resin. With such a combination, the overall cost of the fan cover 251 can be reduced and the weight can be reduced. The combination of the material of the fan housing 284 and the material of the fan frame 285 is not limited to the above-described embodiment. Any material may be selected as the material of the fan housing 284 and the fan frame 285.

FIG. 27 is a diagram showing a pump device 300 to which the electric motor assembly according to the above-described embodiment can be applied. Since the configuration of the present embodiment not particularly described is the same as that of the above-described embodiment, the duplicated description will be omitted.

In the embodiment shown in FIG. 27, the pump device 300 includes an electric motor assembly 1 according to the embodiment shown in FIGS. 1 to 15 and a pump unit 301. In one embodiment, the pump device 300 may include the electric motor assembly 201 and the pump unit 301 according to the embodiments shown in FIGS. 16 to 26. The electric motor assembly 1 is a prime mover of a pump that conveys a liquid.

In the drawings shown below, the air flowing from the cooling fan 25 may be represented by the arrow F1 and the air flowing toward the cooling fan 25 is represented by the arrow F2 for easy understanding of the air flow. There are times. Although both the air flowing from the cooling fan 25 (arrow F1) and the air flowing toward the cooling fan 25 (arrow F2) are shown in the figure, the air flowing from the cooling fan 25 toward the pump unit 301 is shown. When having a structure for forming a flow, the cooling fan 25 forms an air flow only in the direction indicated by the arrow F1, and the cooling fan 25 forms an air flow from the pump portion 301 to the electric motor assembly 1. The cooling fan 25 forms an air flow only in the direction indicated by the arrow F2.

As shown in FIG. 27, the pump unit 301 accommodates a rotating shaft 302 extending in the vertical direction, a plurality of impellers 303 fixed to the rotating shaft 302 (four in the present embodiment), and an impeller 303. A tubular pump casing 311 is provided. In FIG. 27, four impellers 303 are provided, but the number of impellers 303 is not limited to this embodiment. In one embodiment, a single impeller 303 may be provided.

In the embodiment shown in FIG. 27, the pump device 300 is a vertical pump device in which the drive shaft 5 and the rotary shaft 302 extend in the vertical direction (in other words, the vertical direction). The cooling fan 25, the electric motor assembly 1, and the pump unit 301 are arranged in this order along the vertical direction.

The pump casing 311 includes a suction port 310 in which a suction port 310a is formed, and a discharge port 312 in which a discharge port 312a is formed. When the impeller 303 is rotated by the drive of the electric motor assembly 1, the liquid is sucked into the inside of the pump casing 311 from the suction port 310a. The sucked liquid is boosted by the multi-stage impeller 303 and discharged to the outside from the discharge port 312a.

As shown in FIG. 27, the pump unit 301 includes a pump bracket 315 arranged above the pump casing 311 and a pair of guard members (protective covers) 316 attached to the pump bracket 315.

The electric motor assembly 1 is arranged above the pump bracket 315. The end cover 12 of the electric motor assembly 1 is fixed to the upper part of the pump bracket 315, and the pump casing 311 is fixed to the lower part of the pump bracket 315. More specifically, the pump casing 311 has a casing flange 311a above it, and the pump bracket 315 has a bracket flange 315a below it.

The pump casing 311 is fixed to the pump bracket 315 by tightening a plurality of casing fasteners (not shown) extending through the casing flange 311a and the bracket flange 315a.

Inside the pump bracket 315, a coupling (shaft joint) 320 that connects the drive shaft 5 and the rotating shaft 302 is arranged. The coupling 320 is, for example, a spacer coupling. The coupling 320 is a connecting member for transmitting the power of the electric motor assembly 1 to the pump unit 301. In the present embodiment, the axis of the rotating shaft 302 is aligned with the axis CL of the drive shaft 5.

As shown in FIG. 27, the electric motor assembly 1 and the pump unit 301 are arranged in series in the axis CL direction. More specifically, the fan cover 51 (and the cooling fan 25), the inverter case 21, the motor casing 10, and the pump casing 311 are arranged in series and in the vertical direction along the axis CL direction.

Since the inverter case 21 is arranged in series above the motor casing 10, it is not necessary to attach a heavy object to the side surface of the motor casing 10. Therefore, the center of gravity of the pump device 300 is located on the axis CL of the drive shaft 5 and the rotation shaft 302. As a result, the pump device 300 is stably self-supporting.

The advantages of positioning the center of gravity of the pump device 300 on the axis CL are as follows. When the pumping device is applied to the equipment used for water supply in the factory or the assembled product of the customer, the pumping device is installed in the middle of the piping. Therefore, if the center of gravity of the pump device is biased, a load is applied to the piping.

Further, when replacing the pump device, it may be necessary to temporarily make the pump device independent by itself, so it is important to stably arrange the pump device independently. In the embodiment shown in FIG. 27, since the center of gravity of the pump device 300 is located on the axis CL, the pump device 300 can stably stand on its own. Further, the pump device 300 can be incorporated into the pipe without imposing a load on the pipe.

FIG. 28 is a view seen from the direction of line E in FIG. 27. As shown in FIG. 28, the pump bracket 315 is formed with an opening 321. The guard member 316 covers a part of the opening 321 so that a gap GP is formed between the guard member 316 and the pump bracket 315. That is, the guard member 316 has a structure in which the air flowing from the cooling fan 25 or the air flowing toward the cooling fan 25 passes between the inside and the outside of the pump portion 301 (more specifically, the pump bracket 315). have.

The coupling 320 is arranged on the back side of the guard member 316. Therefore, the operator can access the coupling 320 through the opening 321 by removing the guard member 316.

As shown in FIGS. 27 and 28, the pump device 300 includes a shaft sealing device 325 that seals a gap between the pump casing 311 and the rotating shaft 302. The shaft sealing device 325 is one of the components of the pump unit 301. The shaft sealing device 325 includes a fixed side member 325a fixed to the pump casing 311 and a rotating side member 325b fixed to the rotating shaft 302. The fixed side member 325a and the rotating side member 325b are arranged so as to face each other, and the rotating side member 325b is in contact with the fixed side member 325a.

When the rotating shaft 302 is rotated by the drive of the electric motor assembly 1, the rotating side member 325b slides on the fixed side member 325a. Due to this sliding, the sliding surface of the fixed side member 325a and the sliding surface of the rotating side member 325b generate heat, and the shaft sealing device 325 may be seized. Therefore, the pump device 300 according to the embodiment shown in FIG. 27 has a structure capable of cooling the pump unit 301. Hereinafter, this structure will be described with reference to the drawings.

FIG. 29 is a partially enlarged view of the pump device 300. In the embodiment shown in FIG. 27, the electric motor assembly 1 has a structure in which air is linearly flowed along the axis CL direction by the rotation of the cooling fan 25. The electric motor assembly 1 includes at least one electric motor assembly side rectifying projection 330. In the present embodiment, the electric motor assembly 1 includes a first electric motor assembly side rectifying projection 330 and a second electric motor assembly side rectifying projection 330 (see FIG. 27).

The motor assembly side rectifying protrusion 330 is a general term for the fan cover side rectifying protrusion 55, the inverter case side rectifying protrusion 56, and the motor casing side rectifying protrusion 57 in the above-described embodiment, and the fan cover side rectifying protrusion 55 and the inverter case side rectifying protrusion 55. Either the protrusion 56 or the motor casing side rectifying protrusion 57 is referred to as an electric motor assembly side rectifying protrusion 330. Hereinafter, in the present specification, these fan cover side rectifying protrusions 55, inverter case side rectifying protrusions 56, and motor casing side rectifying protrusions 57 may be referred to as motor assembly side rectifying protrusions 330 without distinction. Each of the fan cover side rectifying protrusion 55, the inverter case side rectifying protrusion 56, and the motor casing side rectifying protrusion 57 constitutes the motor assembly side rectifying protrusion 330 of the motor assembly 1. The electric motor assembly side rectifying projection 330 extends outward in the axial direction of the drive shaft 5.

As shown in FIG. 29, the air rectified by the motor assembly side rectifying projection 330 passes linearly through the motor assembly 1 and smoothly flows to the pump bracket 315. The air is then introduced into the pump bracket 315 through the gap GP (see FIG. 28) between the guard member 316 and the opening 321.

Since the shaft sealing device 325 is arranged below the gap GP, the air introduced into the pump bracket 315 comes into contact with the shaft sealing device 325 (see the arrow in FIG. 29). The shaft sealing device 325 is cooled by the air sent by the rotation of the cooling fan 25. As a result, the shaft sealing device 325 can prevent its seizure. In this way, the pump device 300 can realize a long life of the shaft sealing device 325.

In the above-described embodiment, the cooling fan 25 has a structure for forming an air flow from the electric motor assembly 1 (more specifically, the cooling fan 25) to the pump portion 301. In one embodiment, the cooling fan 25 may have a structure that forms a flow of air from the pump section 301 to the motor assembly 1 (more specifically, the cooling fan 25). In this case, due to the rotation of the cooling fan 25, the air around the pump portion 301 flows toward the cooling fan 25.

The pump casing 311 has a structure in which a liquid flows inside the pump casing 311. Therefore, when the low temperature liquid is transferred, the pump casing 311 is cooled, and the air around the pump casing 311 is cooled. When the cooling fan 25 is rotated, the cooled air is introduced into the pump bracket 315 through the gap GP between the guard member 316 and the pump bracket 315. The cooled air then contacts the shaft seal device 325 to effectively cool the shaft seal device 325.

In one embodiment, the inverter case 221 is arranged so as to be aligned with at least one of the plurality of motor casing-side rectifying protrusions 57 in the axis CL direction of the drive shaft 5, and at least one inverter case-side rectifying protrusion 57. 56 may be provided. As described above, when the pump device 300 transfers a low-temperature liquid, the cooling fan 25 causes the cooled air around the pump casing 311 to be transferred from the motor casing side rectifying projection 57 to the inverter case side rectifying projection 56 by its rotation. Form an air flow to guide to. As a result, the cooled air can lower the temperature of the components of the motor assembly 1 (eg, the motor 8 and the inverter 20).

FIG. 30 is a diagram showing another embodiment of the pump device 300. As shown in FIG. 30, the pump unit 301 includes a plurality of pump unit side rectifying protrusions 335 extending outward from the outer surface of the pump unit 301. In other words, the pump unit 301 includes a first pump unit side rectifying projection 335 and a second pump unit side rectifying projection 335.

In the embodiment shown in FIG. 30, the pump portion side rectifying projection 335 extends (projects) outward from the outer surface of the guard member 316. The pump portion side rectifying projection 335 extends in the axis CL direction. The pump portion side rectifying protrusion 335 provided on the guard member 316 may be referred to as a guard member side rectifying protrusion 335.

At least one electric motor assembly side rectifying projection 330 is arranged so as to be aligned with at least one of the plurality of pump portion side rectifying projections 335. In the embodiment shown in FIG. 30, the first electric motor assembly side rectifying projection 330 and the first pump portion side rectifying projection 335 are arranged so as to be aligned with each other, and the second electric motor assembly side rectifying projection 330 and The second pump portion side rectifying projections 335 are arranged so as to be aligned in a straight line. By providing the pump portion side rectifying protrusion 335 on the outer surface of the guard member 316 in this way, the air that has passed through the motor assembly 1 in the rectified state is more reliably rectified and remains in the rectified state. It can flow up to 325 (and pump casing 311) (see arrow F1 in FIG. 30).

The air rectified by the rectifying projection 335 on the pump portion side flows to the pump casing 311. The pump device 300 not only transfers a low temperature liquid, but may also transfer a high temperature liquid. In this case, the components of the pump unit 301 (for example, the pump casing 311 and the shaft sealing device 325) become hot due to the high temperature liquid.

In the present embodiment, since the pump portion side rectifying projection 335 is provided, the cooling fan 25 can smoothly flow air to the pump casing 311 by its rotation. Therefore, the pump device 300 can extend the life of the components of the pump unit 301.

In order to allow air to flow smoothly to the pump casing 311, the outer surface of the pump casing 311 may be arranged inside the pump portion side rectifying projection 335 (and the motor assembly side rectifying projection 330). For the same reason as described above, the casing flange 311a and the bracket flange 315a may be arranged inside the pump portion side rectifying projection 335 (and the motor assembly side rectifying projection 330).

When the pump device 300 transfers a low-temperature liquid, the cooling fan 25 preferably has a structure for forming an air flow from the pump unit 301 to the cooling fan 25. In this case, when the cooling fan 25 rotates, the air cooled by the pump casing 311 smoothly flows to the cooling fan 25 in a state of being rectified by the pump portion side rectifying protrusion 335 and the motor assembly side rectifying protrusion 330 (FIG. 30). See arrow F2). Therefore, the motor 8 and the inverter 20, which are the heat sources of the electric motor assembly 1, are efficiently cooled. As described above, the shaft sealing device 325 is also cooled by the cooled air.

FIG. 31 is a diagram showing still another embodiment of the pump device 300. As shown in FIG. 31, the pump device 300 may include a first pump portion side rectifying projection 335 and a second pump portion side rectifying projection 335 extending outward from the outer surface of the pump bracket 315. The pump portion side rectifying projection 335 extends in the axis CL direction. The pump portion side rectifying protrusion 335 provided on the pump bracket 315 may be referred to as a pump bracket side rectifying protrusion 335.

FIG. 32 is a diagram showing still another embodiment of the pump device 300. As shown in FIG. 32, the pump device 300 may include a first pump portion side rectifying projection 335 and a second pump portion side rectifying projection 335 extending outward from the outer surface of the pump casing 311. The pump portion side rectifying projection 335 extends in the axis CL direction. The pump portion side rectifying projection 335 provided on the pump casing 311 may be referred to as a pump casing side rectifying projection 335.

The arrangement of the pump portion side rectifying projection 335 is not limited to the embodiment shown in FIGS. 30 to 32. Each of the first pump portion side rectifying protrusion 335 and the second pump portion side rectifying protrusion 335 may be provided on any one of the pump casing 311 and the guard member 316, and the pump bracket 315. For example, one of the first pump-side rectifying protrusion 335 and the second pump-side rectifying protrusion 335 may be provided on the pump casing 311 (or guard member 316), and the other may be provided on the guard member 316 (or guard member 316). It may be provided on the pump bracket 315).

In one embodiment, the embodiments shown in FIGS. 30 to 32 may be combined. In this case, the plurality of pump portion side rectifying protrusions 335 are provided on all of the pump casing 311, the guard member 316, and the pump bracket 315. In one embodiment, the pump portion side rectifying projection 335 may be provided on the casing flange 311a and the bracket flange 315a.

In the above-described embodiment, the pump device 300 is a vertical pump device. The pump device 300 may be a horizontal pump device in which the drive shaft 5 and the rotary shaft 302 extend in the horizontal direction. Hereinafter, the horizontal pump device 300 will be described with reference to the drawings.

FIG. 33 is a diagram showing an embodiment of the horizontal pump device 300. As shown in FIG. 33, the pump device 300 is a direct-coupled direct-acting horizontal pump device. In the embodiment shown in FIG. 33, the pump device 300 includes an electric motor assembly 1 and a pump unit 301. The electric motor assembly 1 is also applicable to the pump unit 301 of the type shown in FIG. 33. The pump unit 301 and the electric motor assembly 1 are mounted on the pump base 355.

In the embodiment shown in FIG. 33, the pump device 300 does not include a rotating shaft 302. A single impeller 351 is fixed to the end of the drive shaft 5. The pump device 300 according to the embodiment shown in FIG. 33 is a single-stage horizontal pump device. In one embodiment, the pump device 300 may be a multi-stage horizontal pump device.

The impeller 351 is arranged inside the pump casing 352. The pump casing 352 includes a suction port 353 in which a suction port 353a is formed and a discharge port 354 in which a discharge port 354a is formed. When the impeller 351 is rotated by the drive of the electric motor assembly 1, the liquid is sucked into the pump casing 352 from the suction port 353a. The sucked liquid is boosted by the impeller 351 and discharged to the outside from the discharge port 354a.

Also in the embodiment shown in FIG. 33, the air rectified by the motor assembly side rectifying projection 330 passes linearly through the motor assembly 1 and smoothly flows to the pump casing 352. The air flowing by the rotation of the cooling fan 25 comes into contact with the pump casing 352 and cools the components of the pump portion 301.

In the embodiment shown in FIG. 33, the rotary shaft 302 and the drive shaft 5 are composed of a single shaft, and no coupling for connecting the rotary shaft 302 and the drive shaft 5 is provided. Therefore, compared to the type of pump device in which the rotary shaft 302 and the drive shaft 5 are connected via a coupling, the pump device 300 according to the present embodiment reduces the distance between the pump unit 301 and the electric motor assembly 1. It can be made smaller. As a result, the pump device 300 can more effectively receive the cooling effect of the cooling fan 25.

FIG. 34 is a diagram showing another embodiment of the pump device 300 according to the embodiment shown in FIG. 33. FIG. 35 is a diagram showing an end surface 356 on the motor assembly side of the pump casing 352 shown in FIG. 34. In FIG. 35, the pump casing 352 when viewed from the motor assembly 1 side is drawn. As shown in FIGS. 34 and 35, the pump section 301 may include at least one pump section side rectifying projection 360 provided in the pump casing 352.

The pump portion side rectifying projection 360 is provided on the motor assembly side end surface 356 of the pump casing 352. Also in this embodiment, the pump portion side rectifying protrusion 360 and the electric motor assembly side rectifying protrusion 330 are arranged so as to be aligned in a straight line.

The pump portion side rectifying projection 360 extends from the end surface 356 on the side of the electric motor assembly toward the electric motor assembly 1, and extends outward in the radial direction of the drive shaft 5. The pump casing 352 has a connecting surface 356a to which the electric motor assembly 1 is connected. The connection surface 356a is arranged so as to surround the drive shaft 5. The pump portion side rectifying protrusion 360 is arranged on the protruding surface 356b on the outer side in the radial direction of the connecting surface 356a.

In the embodiment shown in FIG. 35, the pump unit 301 includes a first pump unit side rectifying projection 360 and a second pump unit side rectifying projection 360 arranged radially. The number of rectifying protrusions 360 on the pump portion side is not limited to this embodiment. The shape of the pump portion side rectifying protrusion 360 is also not limited to this embodiment.

The outer diameter of the pump casing 352 is larger than the outer diameter of the motor casing 10 (outer diameter of the pump casing 352> outer diameter of the motor casing 10). Therefore, the air rectified by the motor assembly side rectifying projection 330 flows linearly through the motor assembly 1 and comes into contact with the motor assembly side end face 356. After that, the air flows toward the outer peripheral surface 352a of the pump casing 352 along the pump portion side rectifying projection 360 formed on the end surface 356 on the side of the electric motor assembly. In one embodiment, the outer diameter of the pump casing 352 may be less than or equal to the outer diameter of the motor casing 10.

FIG. 36 is a diagram showing still another embodiment of the pump device 300 shown in FIG. 33. In the embodiment shown in FIG. 36, the pump unit 301 includes a pump unit side rectifying projection 365 provided on the outer peripheral surface 352a of the pump casing 352.

The pump unit 301 includes a first pump unit side rectifying projection 365 and a second pump unit side rectifying projection 365, but the number of pump unit side rectifying projections 365 is not limited to this embodiment. In one embodiment, the pump unit 301 may include a pump unit side rectifying projection 360 shown in FIG. 34 and a pump unit side rectifying projection 365 shown in FIG. 36. That is, the embodiment shown in FIG. 34 and the embodiment shown in FIG. 36 may be combined.

FIG. 37 is a diagram showing another embodiment of the horizontal pump device 300. As shown in FIG. 37, the pump device 300 is a horizontal pump device of a type in which the drive shaft 5 and the rotary shaft 302 are connected via a coupling 380.

In the embodiment shown in FIG. 37, the pump device 300 includes an electric motor assembly 1 and a pump unit 301. The pump unit 301 covers the impeller 351 fixed to the rotating shaft 302, the pump casing 381 accommodating the impeller 351, the pump bracket (bearing body) 382 rotatably accommodating the bearing 385, and the coupling 380. It is provided with a guard member (coupling guard) 383. The guard member 383 has a structure in which the air flowing from the cooling fan 25 or the air flowing toward the cooling fan 25 passes between the inside and the outside of the pump portion 301. The electric motor assembly 1 is also applicable to the pump unit 301 of the type shown in FIG. 37.

FIG. 38 is a diagram showing another embodiment of the pump device 300 according to the embodiment shown in FIG. 37. As shown in FIG. 38, the pump unit 301 has a first pump unit side rectifying projection 390 and a second pump unit extending outward from the outer surface of the pump unit 301 (in this embodiment, the outer surface of the guard member 383). It is provided with a side rectifying protrusion 390. The first pump portion side rectifying projection 390 and the first electric motor assembly side rectifying projection 330 are arranged so as to be aligned with each other, and the second pump portion side rectifying projection 390 and the second electric motor assembly side rectifying projection 330 are arranged. Are arranged so that they are lined up in a straight line.

FIG. 39 is a diagram showing still another embodiment of the pump device 300 according to the embodiment shown in FIG. 37. As shown in FIG. 39, the pump unit 301 includes a first pump unit side rectifying projection 391 and a second pump unit side rectifying projection 391 extending outward from the outer surface of the pump bracket 382. The first pump portion side rectifying projection 391 and the first electric motor assembly side rectifying projection 330 are arranged so as to be aligned with each other, and the second pump portion side rectifying projection 391 and the second motor assembly side rectifying projection 330 are arranged. Are arranged so that they are lined up in a straight line.

FIG. 40 is a diagram showing still another embodiment of the pump device 300 according to the embodiment shown in FIG. 37. As shown in FIG. 40, the pump unit 301 includes a first pump unit side rectifying projection 392 and a second pump unit side rectifying projection 392 extending outward from the outer surface of the pump casing 381. The first pump portion side rectifying projection 392 and the first electric motor assembly side rectifying projection 330 are arranged so as to be aligned with each other, and the second pump portion side rectifying projection 392 and the second electric motor assembly side rectifying projection 330 are arranged. Are arranged so that they are lined up in a straight line.

In one embodiment, the embodiments shown in FIGS. 38 to 40 may be combined. In this case, the first pump portion side rectifying projections 390, 391, 392 and the electric motor assembly side rectifying projections 330 are arranged so as to be aligned with each other, and the second pump portion side rectifying projections 390, 391, 392 and the electric motor. The assembly-side rectifying protrusions 330 are arranged so as to line up in a straight line.

FIG. 41 is a diagram showing still another embodiment of the horizontal pump device 300. As shown in FIG. 41, the pump device 300 includes an electric motor assembly 1 and a pump unit 301. The pump unit 301 includes an impeller 351 fixed to the drive shaft 5 and a pump casing 395 that accommodates the impeller 351. In the embodiment shown in FIG. 41, the pump casing 395 includes a shaft sealing portion 395a. The electric motor assembly 1 can also be applied to the pump unit 301 of the type shown in FIG. 41.

FIG. 42 is a diagram showing another embodiment of the pump device 300 according to the embodiment shown in FIG. 41. As shown in FIG. 42, the pump unit 301 includes a first pump unit side rectifying projection 396 and a second pump unit side rectifying projection 396 extending outward from the outer surface 395b of the pump casing 395. The first pump portion side rectifying projection 396 and the first electric motor assembly side rectifying projection 330 are arranged so as to be aligned with each other, and the second pump portion side rectifying projection 396 and the second motor assembly side rectifying projection 330 are arranged. Are arranged so that they are lined up in a straight line.

In one embodiment, the pump portion 301 may include a pump portion side rectifying projection (see FIG. 35) provided on the motor assembly side end surface 395c of the shaft sealing portion 395a. In this case, the outer diameter of the shaft sealing portion 395a is larger than the outer diameter of the motor casing 10. In FIGS. 41 and 42, the pump portion side rectifying projection corresponding to the pump portion side rectifying projection in FIG. 35 is not shown, but the pump portion side rectifying projection is the same as the pump portion side rectifying projection in FIG. 35. May have the configuration of.

In the embodiment shown in FIGS. 27 to 42, the pump device 300 to which the electric motor assembly 1 is applied to the pump unit 301 has been described, but instead of the electric motor assembly 1, the electric motor assembly 201 (see FIGS. 16 to 26). ) May be applied to the pump unit 301.

In the above-described embodiment, the structure capable of effectively cooling the component of the pump unit 301 (for example, the shaft sealing device 325) has been described, but hereinafter, the component of the pump unit 301 is cooled more effectively. The possible structures will be described with reference to the drawings. In the embodiment shown below, the vertical pump device 300 will be described as an example, but the characteristic structure according to the embodiment shown below can also be applied to the horizontal pump device 300.

As mentioned above, the adoption of a configuration for cooling the pump section 301 and / or the motor assembly 1 is important. Therefore, the pump device 300 for more effectively cooling the pump unit 301 and / or the electric motor assembly 1 will be described below with reference to the drawings.

FIG. 43 is a diagram showing a pump device 300 provided with a cooling structure for more effectively cooling the pump unit 301 and / or the electric motor assembly 1. FIG. 44 is a perspective view of the cooling structure shown in FIG. 43. Since the configuration of the present embodiment not particularly described is the same as that of the above-described embodiment, the duplicated description will be omitted.

As shown in FIGS. 43 and 44, the fan cover 51 includes a cooling structure 400 for cooling the pump portion 301. In one embodiment, the cooling structure 400 may have a configuration corresponding to the above-mentioned tubular portions 52,252 (see FIGS. 14 and 24). In another embodiment, the cooling structure 400 may have a configuration corresponding to the fan frames 85,285 (see FIGS. 15 and 26) described above.

The cooling structure 400 has a structure that makes the flow of air generated by the rotation of the cooling fan 25 smoother between the cooling fan 25 and the pump unit 301. The cooling structure 400 is configured to guide at least a part of the air sent from the cooling fan 25 to at least a part of the pump portion 301 through the guard member 316. Similarly, the cooling structure 400 is configured to introduce at least a part of the air flowing toward the cooling fan 25 from at least a part of the pump unit 301.

In FIGS. 43 and 44, the cooling structure 400 has a tubular shape extending in the axis CL direction and covers the entire circumference of the motor casing 10. The electric motor assembly side rectifying projection 330 is arranged over the entire circumference of the motor casing 10, and the cooling structure 400 is adjacent to the electric motor assembly side rectifying projection 330 and is arranged outside the electric motor assembly side rectifying projection 330. ..

The cooling structure 400 extends to the guard member 316. More specifically, the open end portion 400a of the cooling structure 400 is arranged closer to the pump casing 311 than the end cover 12 of the motor casing 10.

By providing the cooling structure 400, the air flowing from the cooling fan 25 or the air flowing toward the cooling fan 25 does not diffuse to the outside of the motor assembly 1, but the inner surface 400b of the cooling structure 400 and the outer surface of the motor casing 10 It surely flows linearly through the gap between the and.

As described above, the guard member 316 has a structure in which the air flowing from the cooling fan 25 or the air flowing toward the cooling fan 25 passes between the inside and the outside of the pump portion 301. When the cooling fan 25 has a structure that forms an air flow from the electric motor assembly 1 to the pump portion 301, a part of the air that flows linearly by the cooling structure 400 as shown by the arrow F1 in FIG. 43. Is reliably introduced into the pump bracket 315 through the gap GP (see FIG. 28) between the guard member 316 and the pump bracket 315. The rest of the air flows linearly towards the pump casing 311. In this way, the cooling structure 400 can more effectively cool the components of the pump unit 301, particularly the shaft sealing device 325.

When the cooling fan 25 has a structure for forming an air flow from the pump portion 301 to the motor assembly 1, the periphery of the pump casing 311 (and the shaft sealing device 325) is shown by the arrow F2 in FIG. The air of the above flows into the inside of the cooling structure 400 through the opening end portion 400a of the cooling structure 400 by the rotation of the cooling fan 25. After that, the air flows through the gap between the outer surface of the electric motor assembly 1 and the inner surface 400b of the cooling structure 400, and cools the components (motor 8 and inverter 20) of the electric motor assembly 1.

As shown in FIG. 43, the outer surface of the pump portion 301 is arranged inside the rectifying projection 330 on the motor assembly side. Therefore, the air whose flow direction is determined by the cooling structure 400 flows smoothly to the end portion (that is, the lower end portion) of the pump casing 311 without impairing its flow velocity.

FIG. 45 is a diagram showing another embodiment of the cooling structure 400. In the embodiment shown in FIG. 45, the electric motor assembly side rectifying projection 330 is provided on a part of the outer surface of the electric motor assembly 1, and the cooling structure 400 covers the electric motor assembly side rectifying projection 330. Even with such a structure, air surely flows linearly through the gap between the inner surface 400b of the cooling structure 400 and the outer surface of the motor casing 10.

FIG. 46 is a diagram showing still another embodiment of the cooling structure 400. FIG. 47 is a perspective view of the cooling structure 400 shown in FIG. 46. In FIG. 47, the pump device 300 is simply drawn, and the illustration of the rectifying projection 330 on the motor assembly side is omitted. As shown in FIGS. 46 and 47, the cooling structure 400 extends to the pump casing 311. More specifically, the opening end portion 400a of the cooling structure 400 is arranged directly above the bracket flange 315a.

FIG. 48 is a diagram showing still another embodiment of the cooling structure 400. FIG. 49 is a perspective view of the cooling structure 400 shown in FIG. 48. As shown in FIGS. 48 and 49, the cooling structure 400 is inclined inward toward the guard member 316. More specifically, the cooling structure 400 is inclined toward the gap GP between the pump bracket 315 and the guard member 316.

In one embodiment, the cooling structure 400 may have a split structure that can be split into a plurality of split bodies. With such a structure, the operator can easily attach / detach the cooling structure 400.

As shown in FIGS. 48 and 49, the cooling structure 400 has an inclined surface 405. The cooling structure 400 having the inclined surface 405 has a shape in which the cross-sectional area of the cooling structure 400 gradually decreases toward the pump casing 311. With such a structure, the air flowing along the inclined surface 405 of the cooling structure 400 can positively flow between the inside and the outside of the pump bracket 315 through the gap GP.

FIG. 50 is a diagram showing still another embodiment of the cooling structure 400. FIG. 51 is a perspective view of the cooling structure 400 shown in FIG. 50. As shown in FIGS. 50 and 51, the cooling structure 400 extends to the suction port 310 and the discharge port 312 of the pump casing 311. More specifically, the opening end portion 400a of the cooling structure 400 is arranged directly above the suction port 310 and the discharge port 312.

In the embodiment shown in FIGS. 50 and 51, the cooling structure 400 covers most of the pump casing 311 but may cover at least a portion of the pump casing 311. With such a structure, the air flowing by the rotation of the cooling fan 25 passes through the electric motor assembly 1 and smoothly flows to the end of the pump casing 311.

When the pump device 300 transfers a low temperature liquid, the temperature of the pump casing 311 is likely to be lower than the temperature of the motor assembly 1. In this case, the cooling fan 25 preferably has a structure for forming an air flow from the pump portion 301 to the electric motor assembly 1. Due to the rotation of the cooling fan 25 having such a structure, the cooled air around the pump casing 311 passes between the pump casing 311 and the inner surface 400b of the cooling structure 400, and is transmitted from the pump casing 311 to the electric motor assembly. It can flow up to 1. As a result, the cooled air can lower the temperature of the components of the motor assembly 1 (eg, the motor 8 and the inverter 20). In one embodiment, the fan cover 51 may cover at least a part of the cooling fan 25 and the inverter case side rectifying projection 56. The airflow generated by the rotation of the cooling fan 25 is guided to the cooling fan 25 through the fan cover 51.

In the embodiment shown in FIGS. 43 to 51, the pump device 300 to which the electric motor assembly 1 is applied to the pump unit 301 has been described, but instead of the electric motor assembly 1, the electric motor assembly 201 (see FIGS. 16 to 26). ) May be applied to the pump unit 301.

In the embodiment described above, the substrate 42 (or reference numeral 242) is fixed to the inner surface of the cover member 23 (or reference numeral 223) (see, for example, FIGS. 2 and 16). When the pump device 300 is a vertical pump device, the cable (not shown) connected to the substrate 42 of the inverter 20 (or reference numeral 220) may extend in the vertical direction (that is, the direction parallel to the axis CL direction). it can. More specifically, the substrate 42 is provided with terminals (for example, Faston terminals or screw terminals) (not shown), and the cable is connected to the terminals.

There are tall components in the inverter element 41 (or reference numeral 241) (eg, electrolytic capacitors or resistors). By extending the cable in the vertical direction, the extending direction of the inverter element 241 (for example, the electrolytic capacitor) and the extending direction of the cable are the same. Therefore, damage to the inverter element 41 (or reference numeral 241) due to contact of the cable with the inverter element 41 (or reference numeral 241) can be reduced. As a result, the life of the inverter element 41 (or reference numeral 241) can be extended.

It is important to extend the life of the inverter element 41 (or reference numeral 241) from the viewpoint of extending the life of the inverter 20 (or reference numeral 220). Hereinafter, the structure of the pump device 300 for further extending the life of the inverter element 41 (or reference numeral 241) will be described with reference to the drawings.

FIG. 52A is a diagram showing a substrate 242 fixed to the inner surface of the motor casing side cover member 224. FIG. 52 (b) is a diagram showing a comparative example with the configuration shown in FIG. 52 (a). In the embodiment shown in FIGS. 52 (a) and 52 (b), the vertical direction (that is, the direction in which gravity acts) is a direction parallel to the axis CL direction. The board 242 is provided with a terminal 244 (for example, a Faston terminal or a screw terminal), and a cable 245 is connected to the terminal 244.

As shown in FIG. 52A, the substrate 242 is not fixed to the cooling fan side cover member 223 arranged adjacent to the cooling fan 225, but is arranged adjacent to the motor casing 210. It is fixed to the inner surface of the side cover member 224. Since the pump device 300 is a vertical pump device, the substrate 242 is placed on the motor casing side cover member 224, and the inverter element 241 is arranged upward.

With such an arrangement, the gravity acting on the inverter element 241 is received by the substrate 242, and the force in the direction away from the substrate 242 does not act on the inverter element 241. Therefore, the pump device 300 can reduce the stress on the inverter element 241 due to gravity. As a result, the life of the inverter element 241, that is, the inverter 220 can be extended.

Further, in the comparative example shown in FIG. 52 (b), not only the tension due to the wiring but also the gravity acts on the cable 245, so that the cable 245 is pulled downward in the vertical direction. Therefore, the stress on the substrate 242 may increase. In the embodiment shown in FIG. 52 (a), the cable 245 is not pulled vertically downward by gravity. Therefore, the stress on the substrate 242 is reduced, and as a result, the life of the substrate 242 is further extended.

Further, in the embodiment shown in FIG. 52A, the inverter 220 is arranged adjacent to the communication space 281 (that is, the cooling flow path) through which a part of the air flowing by the rotation of the cooling fan 225 passes. That is, the inverter 220 is fixed on the motor casing side cover member 224 that forms a part of the communication space 281. Therefore, the air passing through the communication space 281 can cool the inverter 220 via the motor casing side cover member 224.

FIG. 53A is a diagram showing another embodiment of the inverter 220. FIG. 53B is a diagram showing still another embodiment of the inverter 220. As shown in FIG. 53A, the inverter 220 may include a plurality of substrates 242A, 242B, 242C on which a plurality of inverter elements 241A, 241B, 241C are mounted. The plurality of substrates 242A, 242B, and 242C are arranged in series along the axis CL direction of the drive shaft 205.

As shown in FIG. 53A, the substrate 242A is provided with a terminal 244A, and a power cable 245A is connected to the terminal 244A. Power-related parts are arranged as the inverter element 241A on the substrate 242A adjacent to the motor casing side cover member 224. In the embodiment shown in FIG. 53A, the inverter element 241A mounted on the substrate 242A is preferably a component that requires efficient cooling.

As an example of the inverter element 241A, an electrolytic capacitor, a power element such as an IPM or an IGBT, and / or a component having a large calorific value such as a rectifying bridge diode can be mentioned. Since the substrate 242A is adjacent to the motor casing side cover member 224, the heat of the inverter element 241A is efficiently transferred to the motor casing side cover member 224. Therefore, the inverter element 241A is efficiently cooled.

As shown in FIG. 53A, the inverter element 241A may be arranged between the substrate 242A and the motor casing side cover member 224 (see shading in FIG. 53A). With such an arrangement, the heat of the inverter element 241A is more efficiently transferred to the motor casing side cover member 224, so that the inverter element 241A is cooled more efficiently.

Such an arrangement is not limited to the embodiment shown in FIG. 53 (a). In all the embodiments described above, the inverter element 41 (or reference numeral 241) may be arranged between the substrate 42 (or reference numeral 242) and the inverter case 21 (or reference numeral 221). For example, in the embodiment shown in FIG. 52A, the inverter element 241 may be arranged between the motor casing side cover member 224 and the back surface of the substrate 242, as in FIG. 53A.

When the inverter 220 according to the embodiment shown in FIG. 53A is applied to the embodiment shown in FIG. 52B, the substrate 242A on which the inverter element 241A requiring efficient cooling is mounted is on the cooling fan side. It may be fixed to the inner surface of the cover member 223.

In the embodiment shown in FIG. 53A, the board 242B arranged above the board 242A is provided with the communication connector 244B, and the communication cable 245B is connected to the communication connector 244B. Communication-related components are mounted on the board 242B as the inverter element 241B. As an example of the mounted inverter element 241B, a driver IC or connector for communication and / or a regulator can be mentioned.

In the embodiment shown in FIG. 53A, control-related components are mounted as the inverter element 241C on the substrate 242C arranged above the substrate 242B. As an example of the mounted inverter element 241C, a control element such as a CPU can be mentioned.

The inverter element to be mounted on each of the plurality of boards is not limited to the embodiment shown in FIG. 53 (a). In one embodiment, inverter elements having different characteristics may be arranged on the substrates 242A, 242B, and 242C, respectively. For example, the substrate 242A is a substrate on which a power element is mounted, the substrate 242B is a substrate on which a control circuit (CPU) is mounted, and the substrate 242C is a substrate on which an inverter circuit is mounted. In this way, components (inverter elements 241A, 241B, 241C) that play different roles may be mounted depending on the elements (for example, arrangement, size, etc.) of the substrates 242A, 242B, 242C.

In the present embodiment, three substrates are arranged, but the number of substrates is not limited to this embodiment. In one embodiment, two substrates may be arranged, and in another embodiment, four or more substrates may be arranged. As described above, the inverter 220 may have a multi-stage configuration including a plurality of substrates.

In the embodiment shown in FIG. 53 (b), two substrates 242A and 242B are arranged. In this case, a main circuit (power element, inverter circuit, etc.) may be mounted on the substrate 242A as the inverter element 241A. A control circuit and a communication circuit may be mounted on the substrate 242B as the inverter element 241B.

FIG. 54 is a diagram showing another embodiment of the inverter case 221. In the above-described embodiment, as shown in FIGS. 16 to 26, spacers 270 such as a plurality of protrusion members 260 or ring members 265 are provided between the inverter case 221 and the motor casing 210. In the embodiment shown in FIG. 54, the spacer 270 includes fins 501 formed on the outer surface of the motor casing side cover member 500.

More specifically, as shown in FIG. 54, the inverter case 221 is connected to the motor casing 210 in an upside down state. That is, the inverter case 221 includes a motor casing side cover member 500 arranged adjacent to the motor casing 210 and a cooling fan side cover member 503 arranged adjacent to the cooling fan 225.

The motor casing side cover member 500 has the same structure as the cooling fan side cover member 223 according to the above-described embodiment, and the cooling fan side cover member 503 has the same structure as the cooling fan side cover member 224 according to the above-described embodiment. Has the same structure as. An inverter frame 222 is interposed between the motor casing side cover member 500 and the cooling fan side cover member 503.

The electric motor assembly 201 includes a cooling flow path formed between the motor casing 210 and the inverter case 221. The cooling fan 225 flows along the drive shaft 205 and passes through the cooling flow path. Form a flow. This cooling flow path corresponds to the communication space 281 according to the above-described embodiment, and communicates with the air flow path 280. The spacer 270 composed of fins 501 forms a cooling flow path.

In the embodiment shown in FIG. 54, by arranging the inverter case 221 upside down, the electric motor assembly 201 forms a cooling flow path by fins 501 without providing new parts constituting the spacer 270. Can be done. In one embodiment, fins may be provided on the outer surface of the cooling fan side cover member 503.

In the above-described embodiment, the pump device 300 to which the electric motor assembly 201 is applied to the pump unit 301 has been described, but instead of the electric motor assembly 201, the electric motor assembly 1 (see FIGS. 1 to 15) is used as the pump unit 301. May be applied to.

The electric motor assembly 1 includes an end cover 12 and a motor bracket 13 that close the open end of the motor frame 11 and support the bearings 27 and 28 (see FIG. 1). The drive shaft 5 in such an electric motor assembly 1 is a rotating body that rotates at high speed, and abnormal vibration of the pump unit 301 is transmitted to each component of the electric motor assembly 1 including the inverter 20 via the drive shaft 5. There is a risk of

If the drive shaft 5 and the bearings 27 and 28 are affected by the abnormal vibration, the operation of the electric motor assembly 1 may be hindered. In particular, in the pump device 300, the vibration generated differs depending on the mechanical and electrical elements such as the diameter and output of the pump, the lift, the flow rate, and the usage environment such as the type of the conveyed liquid, and further, when some abnormal vibration occurs. The abnormal vibration is transmitted via the drive shaft 5, and the vibrations of the bearings 27 and 28 increase. Therefore, it is important to adopt a configuration that accurately detects the vibrations of the bearings 27 and 28. Hereinafter, the electric motor assembly 1 having a structure for accurately detecting the vibrations of the bearings 27 and 28 will be described with reference to the drawings.

FIG. 55 is a diagram showing still another embodiment of the electric motor assembly 1. In the embodiment shown in FIG. 55, the motor assembly 1 includes a motor frame 11, bearings 27 and 28, and a bearing support member 600 (that is, a motor bracket 13 or an end cover 12) that closes the open end of the motor frame 11. A sensor mounting portion 605 provided on the bearing support member 600 is provided. In one embodiment, the motor casing 10 may have a bell structure with an end cover 12 (or motor bracket 13) integrally configured with the motor frame 11.

Bearings 27 and 28 as one component of the electric motor assembly 1 are arranged on the load side and / or the non-load side of the motor 8. The bearing support member 600 is a general term for the end cover 12 and the motor bracket 13, and the bearing support member 600 is the end cover 12 and / or the counter-load side of the motor frame 11 that closes the opening end on the load side of the motor frame 11. A motor bracket 13 that closes the open end. In the motor frame 11 of the present embodiment, the opening meant by the opening end is an opening through which the drive shaft 5 penetrates, and is not limited to the shape of the present embodiment. For example, the motor frame 11 may have a side surface in contact with the bearing support member 600.

FIG. 56 is a perspective view showing the sensor mounting portion 605. As shown in FIGS. 55 and 56, the bearing support member (that is, the motor bracket 13) 600 extends in the axial direction of the drive shaft 5 and transmits the state of the bearing 28 to the surface 605a. The surface 605a includes at least one sensor mounting portion 605 to which a sensor 601 for detecting the state of the bearing 28 can be mounted. As a result, the state of the bearings 27 and 28 can be measured without disassembling the motor assembly 1. In addition, the operator can visually recognize the sensor mounting portion 605, and the sensor 601 can be accurately mounted at the same position every time during regular maintenance. As a result, the state can be measured under the same conditions regardless of the operator, the measuring instrument, or the like, and the state change over time can be observed.

More specifically, in the bearing support member 600, the surface 605a of the sensor mounting portion 605 is a horizontal surface, a vertical surface perpendicular to the diameter direction of the drive shaft 5, and a surface perpendicular to the axis CL direction of the drive shaft 5. Have at least one. That is, the sensor 601 is attached to at least one of these three surfaces.

In one embodiment, the sensor 601 is a vibration sensor. Depending on the specifications of the vibration sensor, there are some that can measure the vibration direction in a plurality of directions such as horizontal, vertical, and axial directions, and some that the vibration direction in the measurement target is limited to only one direction. As shown in this embodiment, if the surface 605a constitutes all of the horizontal plane 605a1, the vertical plane 605a2 perpendicular to the diameter direction of the drive shaft 5, and the surface 605a3 perpendicular to the axis CL direction of the drive shaft 5, one direction. Even if a vibration sensor capable of measuring only vibration is used, correct vibration measurement in the horizontal, vertical, and axial directions of the bearings 27 and 28 becomes easy. When using a vibration sensor capable of measuring in multiple directions, or when simply measuring vibration, at least one of the horizontal plane 605a1, the vertical plane 605a2, and the surface 605a3 perpendicular to the axis CL direction of the drive shaft 5 is used. You just have to have it. The sensor 601 which is an example of the sensor attached to the sensor attachment portion 605 in the present embodiment can measure vibrations in three directions such as horizontal, vertical, and axial directions. The sensor 601 is fixed to the sensor mounting portion 605 by various fixing means (not shown) such as a magnet, double-sided tape, an adhesive, or screw fixing. Alternatively, instead of the fixing means, the sensor 601 uses a detector (pickup) or the like that the operator holds in his / her hand to measure the state.

In the embodiment shown in FIG. 55, the bearing support member 600 is a separate member from the motor frame 11. With such a structure, the shape and / or material of the bearing support member 600 can be easily devised without changing the structure of the motor frame 11. For example, various sensors 601 may be used at the measurement site, and the bearing support member 600 can be processed at the site so as to be suitable for fixing means and pickup of the sensor 601. Further, only the bearing support member 600 can be replaced if necessary, such as by using the bearing support member 600 having a material and shape suitable for the state to be measured and the usage environment. On the contrary, the bearing support member 600 can be shared among the models of the plurality of electric motor assemblies 1.

FIG. 57 is a cross-sectional view of the bearing support member 600 provided with the sensor mounting portion 605. FIG. 58 is a view of the bearing support member 600 shown in FIG. 57 as viewed from the axis CL direction of the drive shaft 5. As shown in FIGS. 57 and 58, the bearing support member 600 has a main body portion 610 located inside the motor frame 11 in the radial direction and at least one connecting convex portion 611 protruding from the outer surface 610a of the main body portion 610. I have.

The main body 610 has a disk shape that can be fitted to the motor frame 11. A plurality of (four in this embodiment) connecting convex portions 611 are arranged at equal intervals along the circumferential direction of the main body portion 610. The connecting convex portion 611 is provided at a predetermined angle from the outer surface 610a of the bearing support member 600 (more specifically, the main body portion 610) in the axial radial direction (that is, the radial direction) of the drive shaft 5. Each of the plurality of connecting convex portions 611 is formed with an insertion hole 612 extending in parallel with the axis CL direction of the drive shaft 5. A fastener (for example, a through bolt 72 shown in FIG. 55) is inserted into the insertion hole 612, and the electric motor assembly 1 is assembled.

The sensor mounting portion 605 has a fitting recess 605b having a size capable of gripping the connecting convex portion 611. The sensor mounting portion 605 is mounted on the bearing support member 600 by mounting the sensor mounting portion 605 on the connecting convex portion 611 through the fitting recess 605b. The sensor 601 is attached to the sensor attachment portion 605.

The sensor mounting portion 605 mounted on the bearing support member 600 projects from the motor frame 11 in the axial direction of the drive shaft 5 (see FIG. 55). Since the sensor mounting portion 605 is arranged outside the rectifying projection 330 on the motor assembly side, the measurement of the physical quantity by the sensor 601 is not hindered by the rectifying projection 330 on the motor assembly side.

In the present embodiment, the connecting convex portion 611 of the bearing support member 600 is interposed between the inverter case side rectifying projection 56 and the motor casing side rectifying projection 57. Therefore, the inverter case side rectifying protrusion 56 and the motor casing side rectifying protrusion 57 are arranged so as to be aligned with each other with the connecting convex portion 611 interposed therebetween.

In the present embodiment, a single sensor mounting portion 605 is attached to the bearing support member 600, but the electric motor assembly 1 may include the sensor mounting portion 605 on a plurality of connecting convex portions 611. Further, in the present embodiment, the connecting convex portion 611 and the sensor mounting portion 605 are configured as separate parts, and the sensor mounting portion 605 is attached to the connecting convex portion 611, but the connecting convex portion 611 and the sensor mounting are attached. The unit 605 may be configured as the same component. By being configured as the same component, vibration transmission is more reliable.

As shown in FIGS. 57 and 58, the bearing support portion 33 of the bearing support member 600 has an annular surface 33a and a flat surface 33b that come into contact with the bearing 28. The bearing 28 includes an outer ring 28a in contact with the bearing support member 600, an inner ring 28b fitted to the drive shaft 5, and a rolling element 28c arranged between the outer ring 28a and the inner ring 28b.

The bearing 28 is supported by the bearing support member 600 in a state of being in contact with the annular surface 33a and the flat surface 33b. More specifically, when the annular surface 33a parallel to the axis CL of the drive shaft 5 comes into contact with the outer ring 28a, the horizontal and vertical vibrations of the bearing 28 are transmitted to the surface 605a and perpendicular to the axis CL of the drive shaft 5. When the flat surface 33b comes into contact with the side surface of the outer ring 28a, the vibration of the drive shaft 5 in the bearing 28 in the axis CL direction is transmitted to the surface 605a.

When abnormal vibration occurs in the electric motor assembly 1 or the rotating machine in which the electric motor assembly 1 is used, the abnormal vibration is transmitted to the bearing 28 via the drive shaft 5, and further transmitted from the bearing 28 to the bearing support member 600. As described above, the bearing support member 600 that supports the bearing 28 on the annular surface 33a and the flat surface 33b has a structure in which the drive shaft 5 is remarkably subjected to abnormal vibration among the components of the electric motor assembly 1, and the sensor mounting portion. 605 is attached to the bearing support member 600.

In this embodiment, the sensor 601 includes a vibration sensor that detects the vibration of the bearing 28. In one embodiment, the sensor 601 may include a temperature sensor that detects the temperature in place of or in addition to the vibration sensor. When abnormal vibration occurs in the drive shaft 5, frictional heat may be generated in the bearing 28 that rotatably supports the drive shaft 5. Further, when the electric motor assembly 1 or the component of the rotating machine in which the electric motor assembly 1 is used generates heat due to some abnormality, the heat is transferred to the bearing 28 via the drive shaft 5. As a result, the bearing support member 600 may become hot. Therefore, by providing the bearing support member 600 with a sensor 601 which is a temperature sensor and detecting the abnormal temperature of the bearing 28, it is possible to detect the abnormality of the electric motor assembly 1 or the rotating machine in which the electric motor assembly 1 is used.

When the sensor 601 functions as a vibration sensor in one embodiment, the bearing support member 600 may be made of a material having a higher rigidity than the motor frame 11. For example, the motor frame 11 is made of resin, and the bearing support member 600 is made of metal having a rigidity higher than the rigidity of the resin forming the motor frame 11. If both the motor frame 11 and the bearing support member 600 are made of resin, they may resonate and the sensor 601 may not be able to accurately measure the vibration of the bearing 28. Therefore, it is preferable that the bearing support member 600 is made of a material that has higher rigidity than the material constituting the motor frame 11 and is not easily affected by the vibration of the motor frame 11.

When the sensor 601 functions as a temperature sensor in one embodiment, the bearing support member 600 may be made of a material having a higher thermal conductivity than the motor frame 11. For example, when the motor frame 11 is made of resin, it is preferable that the bearing support member 600 is made of a metal having a thermal conductivity higher than the thermal conductivity of the resin forming the motor frame 11. With such a configuration, the sensor 601 can measure the temperature of the bearing 28 more accurately than the motor frame 11 and the bearing support member 600 are both made of resin.

For example, a sensor 601 that functions as a vibration sensor is attached to the sensor mounting portion 605 of the motor bracket 13 (and / or the end cover 12), and a sensor 601 that functions as a temperature sensor is attached to the sensor of the end cover 12 (and / or the motor bracket 13). It may be attached to the attachment portion 605. A sensor 601 that functions as a vibration sensor and / or a sensor 601 that functions as a temperature sensor may be attached to any of the plurality of sensor mounting portions 605 configured on the motor bracket 13 (and / or the end cover 12).

FIG. 59 is a diagram showing another embodiment of the sensor mounting portion 605. The arrow H in FIG. 59 indicates the horizontal direction, and the arrow V indicates the vertical direction. As shown in FIG. 59, the sensor mounting portion 605 is arranged between the adjacent connecting convex portions 611. In the embodiment shown in FIG. 59, the sensor mounting portion 605 does not have the fitting recess 605b, and the sensor mounting portion 605 is integrally formed on the outer surface 610a of the main body portion 610 of the bearing support member 600. There is. Further, the sensor mounting portion 605 is provided horizontally or vertically passing through the center C1 of the bearing 28. As a result, the vibration of the bearing 28 can be accurately measured.

FIG. 60 is a diagram showing still another embodiment of the sensor mounting portion 605. FIG. 61 is an enlarged view of the sensor mounting portion 605 shown in FIG. 60. As shown in FIGS. 60 and 61, the connecting convex portion 611 of the bearing support member 600 is provided with a notch groove 611a at its end. The sensor mounting portion 605 is embedded in the notch groove 611a. As described above, the sensor mounting portion 605 is not arranged outside the bearing support member 600, but may be arranged inside the bearing support member 600. With such an arrangement, the sensor 601 arranged in the sensor mounting portion 605 has a larger contact area of the sensor 601 in the axial direction (in the direction of arrow A in the figure) than the sensor mounting portion 605 shown in FIG. 58. Therefore, the vibration in the axial direction can be detected more accurately.

In one embodiment, the notch groove 611a may be provided in at least one of the plurality of connecting protrusions 611. In this case, the sensor mounting portion 605 shown in FIG. 57 is arranged in the connecting convex portion 611 not provided with the notch groove 611a, and the sensor mounting portion 605 shown in FIG. 60 is arranged in the connecting convex portion 611 provided with the notched groove 611a. It may be placed in.

FIG. 62 is a diagram showing a sensor mounting portion 605 provided on the surface 600a of the bearing support member 600. In the embodiment shown in FIG. 62, the motor frame 11 has a first side surface 615 on the load side and a second side surface 616 on the unload side. The first side surface 615 on the load side is in contact with the bearing support member 600 (that is, the end cover 12), and the second side surface 616 on the opposite load side is in contact with the bearing support member 600 (that is, the motor bracket 13). In one embodiment, the motor frame 11 may have a split structure that can be split into a plurality of split bodies. In other embodiments, the motor frame 11 may have either a first side surface 615 or a second side surface 616.

Since the end cover 12 and the motor bracket 13 have the same configuration, only the configuration of the bearing support member 600 as the motor bracket 13 will be described below. In the embodiment shown in FIG. 55, the bearing support member 600 (that is, the motor bracket 13) has a main body portion 610 and a bearing support portion 33 projecting from the main body portion 610 in the axis CL direction. In the embodiment shown in 62, the main body portion 610 and the bearing support portion 33 are integrally configured. Therefore, the bearing support member 600 is provided on a horizontal vertical line passing through the central CP of the bearing 28.

In the present embodiment, the sensor mounting portion 605 is provided on the surface 600a of the bearing support member 600. Therefore, the surface 605a of the sensor mounting portion 605 corresponds to the surface 600a of the bearing support member 600. The sensor 601 is arranged on the sensor mounting portion 605 which is a horizontal plane provided on the surface 600a of the bearing support member 600. In other words, the sensor 601 is installed on the sensor mounting portion 605 on a vertical line passing over the central CP. With such an arrangement, the sensor 601 can more accurately measure the vibration in the horizontal and vertical directions passing through the central CP in the axial direction of the sensor 601. The bearing support member 600 may be provided with or in place of the sensor mounting portion 605 which is a horizontal plane, and may be provided with a sensor mounting portion 605 which is a vertical surface on a horizontal line passing over the center CP.

Here, the distance H605 from the axis CL of the surface 600a (that is, the sensor mounting portion 605) of the bearing support member 600 is smaller than the distance H330 from the axis CL of the outer end of the motor assembly side rectifying projection 330 (H605 <H330). ). As described above, since the height of the bearing support member 600 is lower than the height of the rectifying protrusion 330 on the motor assembly side, the pump device 300 provided with the bearing support member 600 of the present embodiment is provided on the bearing support member 600. The sensor 601 does not obstruct the flow of air generated by the rotation of the cooling fan 25, and the electric motor assembly 1 and the pump unit 301 can be cooled more reliably.

The distance H601 from the axis CL of the sensor 601 is preferably smaller than the distance H330 (H601 <H330). Further, in the present embodiment, the distance H605 is smaller than the distance from the axis CL of the outer surface 11a of the motor frame 11. Therefore, in the pump device 300 provided with the bearing support member 600 of the present embodiment, the sensor 601 provided in the bearing support member 600 does not obstruct the air flow generated by the rotation of the cooling fan 25, and the electric motor assembly is more reliable. The solid 1 and the pump unit 301 can be cooled.

FIG. 63 is a diagram showing a sensor mounting portion 605 provided in the surface recess 600b of the bearing support member 600. As shown in FIG. 63, the bearing support member 600 may have a surface recess 600b formed on its surface 600a. In the present embodiment, the sensor mounting portion 605 is provided in the surface recess 600b of the bearing support member 600. Therefore, the surface 605a of the sensor mounting portion 605 corresponds to the surface recess 600b of the bearing support member 600. The sensor 601 is arranged on the sensor mounting portion 605 provided in the surface recess 600b of the bearing support member 600.

Also in this embodiment, the sensor 601 can be installed on a vertical line passing over the central CP. With such an arrangement, the sensor 601 can more accurately measure the vibration in the horizontal and vertical directions passing through the central CP in the axial direction of the sensor 601.

Specifically, the distance H605a from the axis CL of the surface recess 600b of the bearing support member 600 (that is, the surface 605a of the sensor mounting portion 605) is smaller than the distance H330 (H605a <H330). As described above, since the height of the surface recess 600b of the bearing support member 600 is lower than the height of the rectifying protrusion 330 on the motor assembly side, the sensor 601 does not obstruct the flow of air generated by the rotation of the cooling fan 25. In the present embodiment, since the sensor 601 is embedded in the surface recess 600b of the bearing support member 600, the sensor 601 is more firmly fixed.

In FIG. 63, the distance H605a is smaller than the distance H600 between the bearing support member 600 and the axis CL, and the distance H600 is smaller than the distance H330 (H605a <H600 <H330). The distance H601 from the axis CL of the sensor 601 is preferably smaller than the distance H600 (H601 <H600). In this embodiment, surface recesses 600b are formed on the entire circumference of the bearing support member 600. However, it is sufficient that the sensor mounting portion 605 which is a horizontal plane and the sensor mounting portion 605 which is a vertical plane are formed. Therefore, in one embodiment, a horizontal plane and / or a vertical plane is provided on a part of the outer periphery of the bearing support member 600. It is preferable that a surface recess 600b including the surface recess 600b is formed. As a result, the operator can attach the sensor 601 to the same position each time, and the state can be measured under the same conditions regardless of the operator and the timing.

FIG. 64 is a diagram showing a cooling structure 400 (see FIG. 44) applied to the electric motor assembly 1 including the sensor mounting portion 605. In the electric motor assembly 1 shown in FIG. 44, the bearing support member 600 on the counterload side located between the motor frame 11 and the inverter case 21 is covered with the cooling structure 400. Therefore, when the bearing support member 600 including the sensor mounting portion 605 shown in FIG. 64 is adopted in the electric motor assembly 1 shown in FIG. 44, the cooling structure 400 is located at a position facing the sensor mounting portion 605. It is advisable to provide a notch 400n for exposing the. Specifically, the electric motor assembly 1 includes a cooling fan 25 and a cooling structure 400 that cools the motor 8 with the airflow from the cooling fan 25, and the cooling structure 400 covers the outer periphery of the electric motor assembly 1. Further, in the cooling structure 400, the open end portion 400a is arranged closer to the pump casing 311 than the bearing support member 600 on the load side, and the end portion other than the open end portion 400a is in contact with the fan cover 51. Then, in the present embodiment, the cooling structure 400 has a notch 400n for exposing the sensor mounting portion 605 at a position facing the sensor mounting portion 605. The notch 400n facilitates state measurement by the sensor mounting portion 605. In FIG. 64, the sensor mounting portion 605 of the bearing support member 600 (that is, the end cover 12) is exposed from the notch 400n, and the exposed sensor mounting portion 605 is provided with the sensor 601.

FIG. 65 is a diagram showing a cooling structure 400 (see FIG. 45) applied to the electric motor assembly 1 including the sensor mounting portion 605. As shown in FIG. 65, when the bearing support member 600 provided with the sensor mounting portion 605 is adopted in the electric motor assembly 1 shown in FIG. 45, the electric motor assembly 1 shown in FIG. 45 has a part of the bearing support member 600. It is exposed from the cooling structure 400. The sensor mounting portion 605 may be located at the exposed portion. Specifically, the electric motor assembly 1 includes a cooling fan 25 and a cooling structure 400 that is provided so as to face a part of the outer surface of the electric motor assembly 1 and that cools the motor 8 with an air flow from the cooling fan 25. (See FIG. 65). A part of the outer circumference of the bearing support member 600 is exposed from the cooling structure 400, and the sensor mounting portion 605 is located at the portion exposed from the cooling structure 400. By doing so, the state measurement by the sensor mounting portion 605 becomes easy.

In the above-described embodiment, the embodiment in which the sensor mounting portion 605 is applied to the electric motor assembly 1 has been described, but the sensor mounting portion 605 may be applied to the electric motor assembly 201. Further, in the above-described embodiment, the configuration of the electric motor assembly 1 has been described, but even if the sensor mounting unit 605 is applied to the electric motor assembly 1 (or the electric motor assembly 201) and the pump device 300 including the pump unit 301. Good.

Although a plurality of embodiments have been described with reference to various drawings, each of the plurality of embodiments may be combined as much as possible. The embodiments arbitrarily combined according to the purpose can exert their effects synergistically. The motor assembly (and pumping device) may comprise at least one of the characteristic configurations described above.

Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various different forms within the scope of the technical idea.

1 Motor assembly 2 Motor part 3 Inverter part 5 Drive shaft 6 Rotor 7 Stator 7a Stator core 7b Winding 8 Motor 10 Motor casing 11 Motor frame 11a Outer surface 12 End cover (bearing support member)
13 Motor bracket (bearing support member)
13a Outer surface 15 Inverter 21 Inverter case 22 Inverter frame 23 Cover member 24 Protruding part 25 Cooling fan 27 Bearing 28 Bearing 28a Outer ring 28b Inner ring 28c Rolling body 30 Through hole 32 Bearing support 33 Bearing support 33a Ring surface 33b Flat surface 40 Through hole 41 Inverter element 42 Board 43 Spacer 50 Shaft cover 51 Fan cover 51a Opening 52 Cylindrical part 52a Inner surface 52b Connection part 53 Tapered part (fan case part)
55 Fan cover side rectifying protrusion 55a End face 56 Inverter case side rectifying protrusion 56a End face 57 Motor casing side rectifying protrusion 60 Positioning structure 61 First vertical positioning hole 61a Through hole 61b Thread hole 62 Second vertical positioning hole 62a Through hole 62b Screw hole 63 First positioning tool 64 Second positioning tool 70 First parallel positioning hole 70a Thread hole 70b Through hole 71 Second parallel positioning hole 72 Through bolt 80 First protrusion 81 First fitting groove 82 Second protrusion 83 Second fitting Groove 84 Fan housing 85 Fan frame 201 Motor assembly 202 Motor part 203 Inverter part 205 Drive shaft 206 Rotor 207 Fixture 207a Stator core 207b Winding 208 Motor 210 Motor casing 211 Motor frame 212 End cover 213 Motor side plate 220 Inverter 221 Inverter case 222 Inverter frame 223 Cooling fan side cover member 224 Motor casing side cover member 225 Cooling fan 227,228 Bearing 230,231 Through hole 232,233 Bearing support part 236 Fin 239,240 Through hole 239a, 240a Circular groove 241 Inverter element 241A Inverter Element 241B Inverter element 241C Inverter element 242 Board 242A Board 242B Board 242C Board 244 Terminal 244A Terminal 244B Communication connector 245 Cable 245A Power cable 245B Communication cable 250 Cylindrical wall 250a One end 250b End end 250c Main body 251 Fan cover 251a Opening 252 Cylinder part 253 Tapered part (fan case part)
256,257 Cooling fins 258,259 Sealing member 260 Projection member 265 Ring member 265a, 265b Both end faces 265c Outer end face 266 Air hole 267 Through hole 270 Spacer 280 Flow path 281 Communication space 284 Fan housing 285 Fan frame 300 Pump device 301 Pump part 302 Rotating shaft 303 Impeller 310 Suction port 310a Suction port 311 Pump casing 311a Casing flange 312 Discharge port 312a Discharge port 315 Pump bracket 315a Bracket flange 316 Guard member (protective cover)
320 Coupling 321 Opening 325 Shaft sealing device 325a Fixed side member 325b Rotating side member 330 Motor assembly side rectifying protrusion 335 Pump part side rectifying protrusion 351 Impeller 352 Pump casing 352a Outer peripheral surface 353 Suction port 353a Suction port 354 Discharge port 354a Discharge port 355 Pump base 356 Motor assembly side end face 356a Connection surface 356b Protrusion surface 360 Pump part side rectifying protrusion 365 Pump part side rectifying protrusion 380 Coupling 381 Pump casing 382 Pump bracket 383 Guard member (coupling guard)
385 Bearing 390 Pump side rectifying protrusion 391 Pump part side rectifying protrusion 392 Pump part side rectifying protrusion 395 Pump casing 395a Shaft sealing part 395b Outer surface 396 Pump part side rectifying protrusion 400 Cooling structure 400a Opening end 400b Inner surface 400n Notch 405 Inclined surface 500 Motor casing side cover member 501 Fin 503 Cooling fan side cover member 600 Bearing support member 600a Surface 600b Surface recess 601 Sensor 605 Sensor mounting part 605a Surface 605b Fitting recess 610 Main body 610a Outer surface 611 Connection convex part 611a Notch groove 612 Insertion Hole 615 1st side 616 2nd side

Claims (16)

With the pump section
With an electric motor assembly with a drive shaft,
The pump unit includes a plurality of pump unit-side rectifying protrusions extending outward from the outer surface of the pump unit.
The electric motor assembly is a pump device including at least one electric motor assembly-side rectifying protrusion arranged so as to be aligned with at least one of the plurality of pump-side rectifying protrusions. The pump device according to claim 1, wherein the electric motor assembly side rectifying projection extends outward in the axial direction of the drive shaft. The pump unit
With an impeller
A pump casing for accommodating the impeller and
The pump device according to claim 1 or 2, wherein the pump portion side rectifying projection is provided on the pump casing. The pump unit
A guard member covering the coupling guard for transmitting the power of the electric motor assembly to the pump portion is provided.
The pump device according to any one of claims 1 to 3, wherein the pump portion side rectifying projection is provided on the guard member. The pump unit
A pump bracket for connecting the pump casing accommodating the impeller and the electric motor assembly is provided.
The pump device according to any one of claims 1 to 4, wherein the pump portion side rectifying projection is provided on the pump bracket. The pump device according to any one of claims 1 to 5, wherein the pump device is a vertical pump device in which the drive shaft extends in the vertical direction. The pump device according to any one of claims 1 to 5, wherein the pump device is a horizontal pump device in which the drive shaft extends in the horizontal direction. The electric motor assembly
A motor that rotates the drive shaft and
The motor casing that houses the motor and
The inverter that controls the motor and
An inverter case accommodating the inverter and connected in series with the motor casing along the axial direction of the drive shaft is provided.
The pump device according to any one of claims 1 to 6, wherein the inverter case includes a plurality of inverter case-side rectifying protrusions extending outward from the outer surface of the inverter case. A cooling fan arranged outside the inverter case and fixed to the drive shaft,
A fan cover connected to the inverter case so as to cover the cooling fan,
A plurality of fan cover side rectifying protrusions extending inward from the inner surface of the fan cover are provided.
The pump device according to claim 8, wherein at least one of the plurality of fan cover side rectifying protrusions is arranged so as to be aligned with at least one of the plurality of inverter case side rectifying protrusions. The motor assembly further comprises at least one motor casing side rectifying projection extending outward from the outer surface of the motor casing.
The pump device according to claim 8, wherein the motor casing-side rectifying protrusion is arranged so as to be aligned with at least one of the plurality of inverter case-side rectifying protrusions in a straight line in the axial direction of the drive shaft. The pump device according to any one of claims 8 to 10, wherein the electric motor assembly further includes a positioning structure for determining a relative position between the motor casing and the inverter case. The electric motor assembly
A motor that rotates the drive shaft and
The motor casing in which the motor is arranged and
An inverter that controls the operation of the motor and
An inverter case in which the inverter is arranged and the drive shaft penetrates,
A cooling fan arranged adjacent to the inverter case and fixed to the end of the drive shaft,
A tubular wall that is arranged inside the inverter case so as to cover the periphery of the drive shaft and forms a flow path for air that flows by the rotation of the cooling fan.
The claim includes a spacer that is interposed between the motor casing and the inverter case and forms a communication space between the motor casing and the inverter case that communicates the air flow path and the external space. The pump device according to any one of 1 to 11. An electric motor assembly that is the prime mover of a pump that conveys liquid.
Drive shaft and
A motor that rotates the drive shaft and
The motor casing in which the motor is arranged and
An inverter arranged on the opposite load side of the motor casing and controlling the operation of the motor,
An inverter case in which the inverter is placed inside,
A cooling fan arranged on the opposite load side of the inverter and fixed to the drive shaft is provided.
The motor casing comprises a plurality of motor casing side rectifying projections extending outward from the outer surface of the motor casing.
The inverter case includes one of the plurality of motor casing-side rectifying protrusions and at least one inverter case-side rectifying protrusion arranged so as to be aligned with the axial direction of the drive shaft.
The cooling fan is an electric motor assembly that generates an air flow for guiding air around the pump from the motor casing side rectifying protrusion to the inverter case side rectifying protrusion by the rotation of the cooling fan. The electric motor assembly according to claim 13, wherein the electric motor assembly further includes a fan cover that covers at least a part of the cooling fan and the inverter case side rectifying protrusion and guides the airflow to the cooling fan. The electric motor assembly according to claim 13 or 14.
A pump device comprising a pump driven by the electric motor assembly. The pump device according to claim 15.
A direct-acting pump device in which the rotating shaft of the pump and the driving shaft are composed of a single shaft.

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