JP7449157B2 - motor pump - Google Patents

Description

The present invention relates to a motor pump that rotates an impeller in which a permanent magnet is embedded using a magnetic field generated by a motor stator.

A motor pump is known in which an impeller in which a permanent magnet is embedded is rotated by a magnetic field generated by a motor stator. This motor pump includes an impeller in which a permanent magnet is embedded, and a motor stator placed opposite the impeller. The impeller is rotatably supported by a bearing.

The motor stator has a plurality of stator coils, and when three-phase currents are passed through these stator coils, a rotating magnetic field is generated. This rotating magnetic field acts on a permanent magnet embedded in the impeller, driving the impeller to rotate. If the liquid handled by the pump comes into contact with the motor stator, electrical leakage will occur, so a motor casing is installed between the motor stator and the impeller, and the motor casing prevents liquid from entering the motor stator. ing. Further, in this motor pump, a flow path (liquid flow path) for a carrier liquid is formed in the center of the motor stator, and the carrier liquid that has passed through the liquid flow path is fed under pressure by an impeller.

Japanese Patent Application Publication No. 2016-169734

The suction port and discharge port of the motor pump are connected to piping that communicates with upstream or downstream equipment and equipment. Therefore, it is necessary to provide a connection method tailored to the purpose of the motor pump and the devices to be communicated.

For example, if the piping connected to the motor pump is flange-connected, if the motor pump is provided with a flange and connected with a fastener, the installation space for the motor pump including the piping will become large. Further, if flanges such as nipples are provided at the suction port and discharge port of the motor pump, there is a risk that the conveyed liquid may leak from the flanges.

Therefore, an object of the present invention is to provide a compact motor pump that can be connected by a flange.

In one aspect, an impeller in which a permanent magnet is embedded, a pump casing that accommodates the impeller, a motor stator having a plurality of stator coils, a motor casing that accommodates the motor stator, and the motor casing. A motor pump, comprising: a liquid flow path formed in the center of the impeller, through which the carrier liquid conveyed by the impeller passes; and a flange connection portion in which a suction port or a discharge port of the liquid flow path is formed. provided.

In one aspect, the flange connection portion includes a flange facing surface facing a flange member connected to the motor pump, and a fastener formed on the flange facing surface for fastening the motor pump and the flange member. It has a screwing part that can be screwed together.
In one aspect, the flange connection part is removable from the pump casing or the motor casing.
In one aspect, the flange connection portion forms a suction port for the liquid flow path and has a communication flow path through which fluid for cooling the motor stator flows.

In one aspect, the motor pump includes a cooling channel formed in the motor casing, through which a fluid having a temperature lower than that of the carrier liquid flows.
In one aspect, a communication channel formed in the flange connection portion communicates with a cooling channel in the motor casing through which cooling fluid flows.
In one embodiment, the motor pump includes a cooling jacket through which a cooling fluid having a temperature lower than that of the carrier liquid flows, and the cooling jacket covers at least an outer circumferential surface of the motor casing.
In one embodiment, a communication channel formed in the flange connection portion communicates with a cooling channel in the cooling jacket through which a cooling fluid flows.

Since the motor pump includes a flange connection portion, even if the flange member is connected to the motor pump, the size of the motor pump can be made more compact.

FIG. 1 is a cross-sectional view showing one embodiment of a motor pump. It is a figure showing other embodiments of a motor pump. It is a figure which shows other embodiment of a cooling jacket. 4 is a sectional view taken along line AA in FIG. 3. FIG. It is a figure which shows yet another embodiment of a cooling jacket. FIG. 2 is a diagram illustrating an embodiment of a cooling jacket composed of detachable divided bodies. FIG. 7 is a diagram showing another embodiment of a cooling jacket configured of detachable divided bodies. It is a figure which shows the terminal box mounted on the motor pump. It is a side view of the terminal box mounted on the motor pump. It is a top view of the terminal box placed on the motor pump. It is a figure which shows the terminal box arrange|positioned below the motor pump. It is a side view of the terminal box arranged below a motor pump. FIG. 7 is a diagram showing still another embodiment of a cooling mechanism that suppresses an increase in surface temperature of a motor casing. It is a figure which shows yet another embodiment of a motor pump. It is a figure which shows yet another embodiment of a motor pump. It is a figure which shows yet another embodiment of a motor pump. It is a figure which shows yet another embodiment of a motor pump.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing one embodiment of a motor pump. This motor pump includes an impeller 1 in which a plurality of permanent magnets 5 are embedded, a motor stator 6 that generates magnetic force acting on these permanent magnets 5, a pump casing 2 that houses the impeller 1, and a motor fixing member. The motor casing 3 includes a motor casing 3 that accommodates the child 6, and a bearing assembly 10 that supports the radial load and thrust load of the impeller 1. Motor stator 6 and bearing assembly 10 are arranged on the suction side of impeller 1 .

An O-ring 9 as a sealing member is provided between the pump casing 2 and the motor casing 3. The impeller 1 and the motor casing 3 face each other with a small gap interposed therebetween, and the impeller 1 rotates when a rotating magnetic field generated by the motor stator 6 acts on the permanent magnet 5.

The impeller 1 is rotatably supported by a single bearing assembly 10. This bearing assembly 10 is a sliding bearing (dynamic pressure bearing) that utilizes the dynamic pressure of a liquid. This bearing assembly 10 is composed of a combination of a rotating side bearing 11 and a stationary side bearing 12 that are loosely engaged with each other. The rotation side bearing 11 is fixed to the impeller 1 and is arranged so as to surround the liquid inlet of the impeller 1.

The fixed side bearing 12 is fixed to the motor casing 3 and is arranged on the suction side of the rotating side bearing 11. This fixed side bearing 12 has a radial surface 12a that supports the radial load of the impeller 1, and a thrust surface 12b that supports the thrust load of the impeller 1. The radial surface 12a is parallel to the axis of the impeller 1, and the thrust surface 12b is perpendicular to the axis of the impeller 1.

The rotating side bearing 11 has an annular shape, and the inner peripheral surface of the rotating side bearing 11 faces the radial surface 12a of the stationary side bearing 12, and the side surface of the rotating side bearing 11 faces the thrust surface 12b of the stationary side bearing 12. is facing. A small gap is formed between the inner circumferential surface of the rotation-side bearing 11 and the radial surface 12a, and between the side surface of the rotation-side bearing 11 and the thrust surface 12b. Furthermore, a spiral groove (not shown) is formed on the inner circumferential surface and side surface of the rotating side bearing 11 to generate dynamic pressure.

A portion of the liquid discharged from the impeller 1 is guided to the bearing assembly 10 through a small gap between the impeller 1 and the motor casing 3. When the rotating side bearing 11 rotates together with the impeller 1, liquid dynamic pressure is generated between the rotating side bearing 11 and the stationary side bearing 12, whereby the impeller 1 is supported by the bearing assembly 10 in a non-contact manner. . Since the stationary side bearing 12 supports the rotating side bearing 11 by the orthogonal radial surface 12a and thrust surface 12b, the tilting of the impeller 1 is regulated by the bearing assembly 10. The bearing assembly 10 (rotating side bearing 11 and stationary side bearing 12) is made of a material with excellent wear resistance, such as ceramic or carbon.

A suction port 15 having a suction port 15a is fixed to the motor casing 3. This suction port 15 is made of metal such as stainless steel and is connected to a suction line (not shown). A liquid flow path X is formed in the center of the suction port 15, the motor casing 3, and the bearing assembly 10, respectively. These liquid channels X are connected in a line and constitute one cooling channel 65 extending from the suction port 15a to the liquid inlet of the impeller 1. In this specification, the symbol CL indicates the direction in which the cooling channel 65 extends.

The suction port 15 has a cylindrical base 15c and a cylindrical shaft 15d having a smaller diameter than the base 15c, and is connected to the liquid flow path X. The base portion 15c and the shaft portion 15d are integrally formed, and the shaft portion 15d extends into the motor casing 3 from the base portion 15c. The central axes of the base 15c and the shaft 15d coincide with the central axis of the suction port 15, and a liquid flow path 15b is formed by the inner peripheral surfaces of the base 15c and the shaft 15d. A threaded portion 15e is formed on a part of the outer peripheral surface of the shaft portion 15d, and a threaded hole 3b is formed in the motor casing 3. The suction port 15 is fixed to the motor casing 3 by engaging the threaded portion 15e of the suction port 15 with the screw hole 3b of the motor casing 3.

The threaded portion 15e is not formed on the outer circumferential surface on the distal end side of the shaft portion 15d. An annular groove 15f is provided on the outer peripheral surface of the shaft portion 15d where the threaded portion 15e is not formed. An O-ring 13 that seals the gap between the motor casing 3 and the suction port 15 is arranged within the annular groove 15f.

A discharge port 16 having a discharge port 16a is provided on the side surface of the pump casing 2, and the liquid pressurized by the rotating impeller 1 is discharged through the discharge port 16a. The motor pump according to this embodiment is a so-called end-top type motor pump in which the suction port 15a and the discharge port 16a are perpendicular to each other.

When the impeller 1 rotates, liquid is introduced into the liquid inlet of the impeller 1 from the suction port 15a of the motor pump. The liquid is pressurized by the rotation of the impeller 1 and is discharged from the discharge port 16a. While the impeller 1 is transferring the liquid, the back surface of the impeller 1 is pressed toward the suction side (that is, toward the suction port 15a) by the pressurized liquid. Since the bearing assembly 10 is disposed on the suction side of the impeller 1, it supports the thrust load of the impeller 1 from the suction side. According to the configuration according to the present embodiment, the radial load and thrust load of the impeller 1 can be supported by one bearing assembly 10 without contact, thereby realizing a compact motor pump that generates fewer particles. Can be done.

As shown in FIG. 1, the side wall portion 32 of the motor casing 3 is arranged to face the side surface of the impeller 1 on the suction side. That is, the side wall portion 32 is located between the impeller 1 and the stator coil 6B, and functions as a partition wall that partitions the impeller 1 and the motor stator 6. The rotating magnetic field generated by the motor stator 6 passes through the side wall portion 32 and reaches the permanent magnet 5 of the impeller 1 . Therefore, it is preferable that the side wall portion 32 of the motor casing 3 is as thin as possible. For example, the side wall portion 32 of the motor casing 3 has a thickness of several mm.

As shown in FIG. 1, the motor pump of this embodiment is provided with a heat radiating member 20 that contacts the stator core 6A of the motor stator 6 and the suction port 15. The heat dissipation member 20 is attached to the motor casing 3 and is made of a material having higher thermal conductivity than the motor casing 3. Such materials are, for example, metals such as stainless steel or aluminum, or ceramics.

The motor stator 6 is housed in a housing space formed within the motor casing 3, and the housing space is closed by a heat radiating member 20 as shown in FIG. Therefore, the heat dissipation member 20 of this embodiment is used as a motor cover that closes the accommodation space of the motor stator 6. The heat dissipation member 20 includes a cover plate 20a that closes a housing space for the motor stator 6, and a fixing ring 20b that protrudes toward the motor stator 6 from the surface of the cover plate 20a. These cover plate 20a and fixing ring 20b are integrally formed. The cover plate 20a and the fixing ring 20b that constitute the heat dissipation member 20 may be separate members. Also in this case, the cover plate 20a and the fixing ring 20b are both made of a material having higher thermal conductivity than the motor casing 3.

The cover plate 20a has a disk shape as a whole, and a hole into which the suction port 15 is inserted is formed in the center. The threaded portion 15e of the suction port 15 is inserted into the threaded hole 3b of the motor casing 3, and a portion of the cover plate 20a of the heat dissipation member 20 is sandwiched between the base portion 15c of the suction port 15 and the motor casing 3. There is. In this state, the fixing ring 20b of the heat radiating member 20 is in contact with the stator core 6A of the motor stator 6, and presses the motor stator 6 against the side wall portion 32 of the motor casing 3. In this way, the heat dissipation member 20 of this embodiment contacts the stator core 6A and the suction port 15, and also functions as a fixing member that fixes the position of the motor stator 6.

When a current is applied to the stator coil 6B of the motor stator 6, the stator coil 6B generates heat. A portion of the heat is transferred to the liquid via the side wall portion 32 of the motor casing 3, and the other portion is radiated to the outside air via the motor casing 3 and the heat radiating member 20. The heat generated in the motor stator 6 is transferred to the heat radiating member 20 that contacts the stator core 6A of the motor stator 6 and has a higher thermal conductivity than the motor casing 3, and is efficiently transferred to the outside air from the heat radiating member 20. is dissipated into.

Furthermore, this heat radiating member 20 is in contact with the suction port 15 . Since the suction port 15 is made of metal, it has high thermal conductivity. Therefore, the heat transferred from the heat radiating member 20 to the suction port 15 is efficiently dissipated from the suction port 15 to the outside air. Further, the suction port 15 is in contact with the liquid flowing within the liquid flow path 15b. Therefore, the heat transferred to the suction port 15 is transferred to the liquid flowing within the liquid flow path 15b. As a result, the heat generated in the motor stator 6 can be further efficiently dissipated to the outside of the motor pump, so that an increase in the temperature of the motor stator 6 can be efficiently suppressed.

When the above-mentioned motor pump transfers high-temperature liquid, the motor stator 6 becomes high temperature, and the operation may be stopped due to detection of temperature abnormality, or in the worst case, the motor stator 6 may fail and operation may become impossible. There is a risk of burnout or burnout. Here, the detection of temperature abnormality means that when the detection value of a temperature sensor (not shown) attached to the motor pump becomes equal to or higher than a threshold value, the motor pump control device determines that the temperature is abnormal and stops the motor pump. The purpose is to avoid burnout of the motor pump. Therefore, in order to improve the cooling efficiency of the motor casing 3, the motor pump is provided with a cooling jacket 60 that covers the motor casing 3. The structure of the cooling jacket 60 will be described below with reference to the drawings.

As shown in FIG. 1, the motor pump includes a cooling jacket 60 that covers the outer peripheral surface 3c of the motor casing 3. The cooling jacket 60 is attached to the outer peripheral surface 3c of the motor casing 3. The cooling jacket 60 is configured so that a cooling liquid having a temperature lower than that of the liquid conveyed by the impeller 1 flows through the liquid flow path X. That is, the cooling jacket 60 that forms the cooling channel 65 through which the cooling fluid flows is attached to the outer circumferential surface 3c of the motor casing 3. However, the coolant flowing in the cooling channel 65 is an example of a cooling fluid, and the cooling fluid may be a liquid such as tap water, factory water, or antifreeze (for example, propylene glycol), or a gas. good.

The cooling jacket 60 of this embodiment includes a coolant inlet 60A into which the coolant flows, and a coolant outlet 60B from which the coolant is discharged. These coolant inlet 60A and coolant outlet 60B extend parallel to the CL direction of the cooling channel 65. The coolant inlet 60A is arranged below the motor casing 3, and the coolant outlet 60B is arranged above the motor casing 3. In one embodiment, the coolant inlet 60A may be arranged above the motor casing 3 and the coolant outlet 60B may be arranged below the motor casing 3.

The cooling jacket 60 has a cooling channel 65 through which a cooling liquid flows. More specifically, the cooling jacket 60 has a recess 62 formed on its inner surface 61, and the cooling flow path 65 is formed between the recess 62 and the outer peripheral surface 3c of the motor casing 3. There is. As a result, the coolant comes into direct contact with the outer circumferential surface 3c of the motor casing 3, thereby suppressing a rise in temperature of the motor pump. Furthermore, by changing the shape and material of the cooling channel 65, the motor pump can handle liquids to be transported at a wide range of temperatures.

The cooling channel 65 communicates with the cooling liquid inlet 60A and the cooling liquid outlet 60B. Coolant (for example, tap water) flows into the cooling channel 65 from a coolant supply source (not shown) through the coolant inlet 60A. The coolant flowing into the cooling flow path 65 contacts the outer peripheral surface 3c of the motor casing 3 and cools the motor casing 3. Thereafter, the coolant flows inside the cooling channel 65 and is discharged from the coolant outlet 60B. In this embodiment, the coolant flows in from the coolant inlet 60A and is discharged from the coolant outlet 60B. However, it is only necessary that the temperature rise of the motor pump is suppressed by the coolant in the cooling jacket 60, and in one embodiment, a coolant such as antifreeze may be sealed in the cooling channel 65.

In this embodiment, both the coolant inlet 60A and the coolant outlet 60B are formed in a plane in the same direction as the suction port 15 (that is, in a direction parallel to the CL direction of the liquid flow path X). In one embodiment, at least one of the coolant inlet 60A and the coolant outlet 60B may be formed on the same surface as the suction port 15. As a result, the suction port 15a and the pipes connected to the coolant inlet 60A and the coolant outlet 60B formed on the same surface as the suction port 15a can be piped in the same direction, so there is a work space for the pipes. The installation space for the motor pump, including the motor pump, can be reduced.

According to this embodiment, the motor pump includes a cooling jacket 60 that cools the motor casing 3 by bringing the cooling liquid into contact with the outer peripheral surface 3c of the motor casing 3. Therefore, even when transporting high-temperature liquid, the cooling jacket 60 can suppress the temperature rise of the motor pump while suppressing the temperature drop of the liquid to be transported. A motor pump having such a structure is particularly effective for conveying high-temperature liquids.

The cooling jacket 60 is detachably attached to the motor casing 3. Therefore, when the liquid conveyed by the motor pump is at room temperature or low temperature, the motor pump may be operated with the cooling jacket 60 removed from the motor casing 3. On the other hand, if the liquid conveyed by the motor pump is at a high temperature, the motor pump may be operated with the cooling jacket 60 attached to the motor casing 3. In this way, the cooling jacket 60 can be attached or detached depending on the type of liquid to be conveyed. Further, if the cooling jacket 60 has a pressure-resistant and explosion-proof function, the motor pump can be made into a pressure-resistant and explosion-proof device by attaching the cooling jacket 60.

FIG. 2 is a diagram showing another embodiment of the motor pump. The configuration and effects of this embodiment, which are not particularly described, are the same as those of the above-described embodiment, so the redundant explanation will be omitted. As shown in FIG. 2, the cooling jacket 60 may include a coolant inlet 60A disposed on the same surface as the suction port 15a, and a coolant outlet 60B disposed in the same direction as the discharge port 16a. Specifically, in the cooling jacket 60, the suction port 15a, which extends parallel to the CL direction of the liquid channel X, and the coolant inlet 60A are arranged in the same direction, and extend perpendicularly to the CL direction of the liquid channel X. The discharge port 16a and the coolant outlet 60B are arranged in the same direction. In one embodiment, the cooling jacket 60 may have the outlet 16a and the coolant inlet 60A arranged in the same direction, the suction port 15a and the coolant outlet 60B in the same direction, or the outlet 16a and the coolant outlet 60B. Both the coolant inlet 60A and the coolant outlet 60B may be arranged in the same direction.

In this way, at least one of the coolant inlet 60A and the coolant outlet 60B is formed in the same direction as the discharge port 16a formed in the pump casing 3. As a result, the pipes connected to the discharge port 16a and the coolant inlet 60A and the coolant outlet 60B, which are formed in the same direction as the suction port 15a, can be piped in the same direction, thereby saving work space for the pipes. The installation space for the motor pump can be reduced.

The liquid conveyed by the motor pump of this embodiment may be a flammable liquid that has the risk of ignition and explosion. In that case, it is installed inside a box that is surrounded by the surrounding area. In the cooling jacket 60 of the above-described embodiment, the cooling liquid inlet 60A and the cooling liquid outlet 60B are arranged in the same direction as the suction port 15a and the discharge port 16a, so the installation space can be reduced, and the limited space inside the box can be reduced. can be used effectively.

FIG. 3 is a diagram showing another embodiment of the cooling jacket 60. The configuration and effects of this embodiment, which are not particularly described, are the same as those of the above-described embodiment, so the redundant explanation will be omitted. As shown in FIG. 3, the cooling jacket 60 includes a motor casing side part (first part) 60a that covers the outer peripheral surface 3c of the motor casing 3, and a motor casing side part 60a toward the suction port 15, that is, a motor casing side part 60a that covers the outer peripheral surface 3c of the motor casing 3. A heat dissipating member side portion (second portion) 60b extending toward the center of the heat dissipation member 60. The heat radiation member side portion 60b is attached to the heat radiation member 20.

The cooling jacket 60 includes a first cooling passage 65 formed along the outer peripheral surface of the motor casing 3 and a second cooling passage 70 communicating with the first cooling passage 65 and in contact with the heat dissipation member 20. We are prepared. The motor casing side portion 60a has a recess 62 formed on its inner surface 61, and the recess 62 forms a first cooling channel 65. The heat dissipation member side portion 60b has a heat dissipation member side surface (first surface) 63 that contacts the heat dissipation member 20, and a surface (second surface) 66 on the opposite side to the first surface 63. . Further, the coolant inlet 60A and the coolant outlet 60B are formed on the second surface 66 that forms the second cooling flow path 70.

A groove 67 is formed in the first surface 63 and connected to the coolant inlet 60A and the coolant outlet 60B. In this embodiment, the groove portion 67 is arranged concentrically with the suction port 15. In one embodiment, the groove portion 67 may be formed on the first surface 63, and its center may be located at a different position from the suction port 15. A second cooling channel 70 is formed between the groove portion 67 and the heat radiating member 20. A communication channel 68 is arranged between the groove 67 and the recess 62, and the first cooling channel 65 and the second cooling channel 70 communicate with each other through the communication channel 68. A coolant inlet 60A and a coolant outlet 60B provided in the second cooling channel 70 communicate with the first cooling channel 65 through the second cooling channel 70.

FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3. In the embodiment shown in FIGS. 3 and 4, the coolant flowing into the second cooling channel 70 through the coolant inlet 60A cools the motor stator 6 through the heat radiating member 20. Furthermore, the coolant is also in contact with the heat radiating member 20, and can take away heat from the motor casing 3 indirectly (that is, via the heat radiating member 20). That is, in this embodiment, in addition to the outer circumferential surface parallel to the CL direction in the motor casing 3, cooling can be performed from the outside of a surface perpendicular to the CL direction. Moreover, in the motor pump of this embodiment, the coolant inlet 60A and the coolant outlet 60B are formed outside the suction port 15a, so that the temperature of the conveyed liquid can be maintained while being conveyed. In other words, the conveyed liquid passing through the center of the motor casing 3 is not easily cooled by the cooling liquid.

When the supply of the coolant continues, the coolant flows through the entire second cooling channel 70 and flows to the outside through the coolant outlet 60B, while flowing into the first cooling channel 65 through the communication channel 68. . The coolant flowing into the first cooling channel 65 contacts the outer peripheral surface 3c of the motor casing 3 and directly cools the motor casing 3 (and the motor stator 6). The coolant flows throughout the first cooling channel 65 and flows to the outside through the coolant outlet 60B.

In this way, when the supply of the coolant is continued, the coolant fills the first cooling channel 65, the second cooling channel 70, and the communication channel 68, and it is possible to suppress the temperature rise of the motor pump. can.

In the embodiment shown in FIG. 4, the communication channel 68 is a radial channel extending radially from the second cooling channel 70, but is an annular channel arranged so as to surround the second cooling channel 70. Alternatively, it may be a plane extending across the cross section A. Further, the number and shape of the communication passages 68 are not limited to those shown in the drawings, and it is sufficient that the communication passages 68 can communicate the first cooling passage 65 and the second cooling passage 70.

FIG. 5 is a diagram showing still another embodiment of the cooling jacket 60. The configuration and effects of this embodiment, which are not particularly described, are the same as those of the above-mentioned embodiment, so the redundant explanation will be omitted. As shown in FIG. 5, the cooling jacket 60 includes reinforcing ribs 75 formed on its outer surface.

The reinforcing rib 75 includes a motor casing side reinforcing rib 75A extending from the motor casing side portion 60a and a heat radiating member side reinforcing rib 75B extending from the heat radiating member side portion 60b. In the embodiment shown in FIG. 5, a plurality of reinforcing ribs 75A and a plurality of reinforcing ribs 75B are provided, but the number of reinforcing ribs 75A and the number of reinforcing ribs 75B are not limited to this embodiment. In one embodiment, a single reinforcing rib 75A and a single reinforcing rib 75B may be provided.

According to the embodiment shown in FIG. 5, reinforcing ribs 75 can increase the strength of the cooling jacket. Furthermore, by providing the reinforcing ribs 75, the surface area of the cooling jacket 60 can be increased, so that the cooling fluid that has taken away the heat from the motor casing 3 can be cooled more efficiently. In other words, the reinforcing ribs 75 function as radiation fins. In one embodiment, reinforcing ribs 75 may be applied to the motor pump shown in FIGS. 1 and 2. This reinforcing rib 75 can be used when the motor pump of this embodiment carries a flammable liquid that has a risk of ignition and explosion, or when it is installed in a place where there is a risk of ignition and explosion due to flammable gas or flammable liquid. But you can drive safely.

FIG. 6 is a diagram showing an embodiment of a cooling jacket composed of detachable divided bodies. FIG. 7 is a diagram showing another embodiment of a cooling jacket composed of detachable divided bodies. As shown in FIG. 6, the cooling jacket having a cooling channel through which the cooling liquid flows is composed of a first divided body 80A and a second divided body 80B that are detachable from each other. In the embodiment shown in FIG. 6, the cooling jacket 60 has a left and right halves, and in the embodiment shown in FIG. 7, the cooling jacket 60 has a top and bottom halves.

As shown in FIGS. 6 and 7, the first divided body 80A has first both-side flanges 81 extending from both ends thereof, and the second divided body 80B has second both-side flanges 82 extending from both ends thereof. It is preferable that you do so. In this embodiment, the first both-side flanges 81 and the second both-side flanges 82 can be fastened to each other by fasteners (for example, bolts and nuts) 85 via a seal member (not shown). However, it is sufficient that the first divided body 80A and the second divided body 80B can be connected in a watertight manner, and in one embodiment, a fitting type may be used. Since the cooling jacket 60 can be attached to and removed from the motor casing 3, the motor pump can be adapted to a wide temperature range by changing the design or the presence or absence of the cooling jacket 60.

As shown in FIGS. 6 and 7, the suction port 15a, the coolant inlet 60A, and the coolant outlet 60B of the suction port 15 (in other words, the liquid flow path The flange 81 and the second side flanges 82 are connected at a plane passing through the center of the suction port 15, the coolant inlet 60A, and the coolant outlet 60B. Here, when the cooling jacket 60 has a pressure-resistant and explosion-proof structure, it is preferably made of a cast metal having superior strength. This positional relationship between the first side flanges 81, the second side flanges 82, the suction port 15, the coolant inlet 60A, and the coolant outlet 60B makes it easier to remove the cooling jacket 60 from the mold when it is formed of a casting. This has the manufacturing advantage of simplifying the manufacturing process.

In the embodiment shown in FIG. 6, the coolant inlet 60A and the coolant outlet 60B are arranged in the vertical direction, and the first both-side flanges 81 and the second both-side flanges 82 extend in the vertical direction. In the embodiment shown in FIG. 7, the coolant inlet 60A and the coolant outlet 60B are arranged horizontally, and the first both-side flanges 81 and the second both-side flanges 82 extend horizontally.

As shown in FIG. 6, the first both-side flanges 81 and the second both-side flanges 82 extend vertically, or as shown in FIG. 7, the first both-side flanges 81 and the second both-side flanges 82 extend horizontally. As a result, the following effects can be achieved. That is, depending on the installation environment of the motor pump, there may be cases where there is no space above and below the motor pump, or there may be no space between the motor pump and the left and right directions in the drawing. For example, if there is no space in the vertical direction of the motor pump, arrange the cooling jacket 60 so that the first side flanges 81 and the second side flanges 82 extend horizontally (see FIG. 7), and If there is no space in this direction, the cooling jacket 60 is arranged so that the first both-side flanges 81 and the second both-side flanges 82 extend in the vertical direction (see FIG. 6). In this way, with the configuration that can be rotated and used as necessary, the placement and operation of the motor pump will not be hindered depending on the installation environment of the motor pump.

The detachable split structure described above may be applied to all of the cooling jackets 60 described above. In particular, when the cooling jacket 60 has a pressure-resistant and explosion-proof structure, the main body of the cooling jacket 60 becomes large, so by making the cooling jacket 60 have a split structure, it is possible to improve the workability of attachment and detachment and the installation workability of piping and the like. Further, when the cooling jacket 60 has a pressure-resistant and explosion-proof structure, the fastening structure between the first divided body 80A and the second divided body 80B is also increased in size. Therefore, work efficiency is improved by being able to select the arrangement of the cooling jacket 60. Note that the cooling jacket 60 of this embodiment becomes the cooling jacket shown in FIG. 7 by rotating the cooling jacket 60 shown in FIG. 6 by 90 degrees. However, in one embodiment, the cooling jacket 60 shown in FIG. 6 and the cooling jacket 60 shown in FIG. 7 may be configured separately. In that case, it would be good if the user could select one or the other according to their needs.

FIG. 8 is a diagram showing a terminal box placed on a motor pump. FIG. 9 is a side view of the terminal box mounted on the motor pump. FIG. 10 is a top view of the terminal box placed on the motor pump. As shown in FIGS. 8 to 10, a terminal box 100 that accommodates members such as a terminal block (not shown) may be placed on the motor pump (more specifically, the cooling jacket 60).

In the embodiment shown in FIGS. 8 to 10, the terminal box 100 is arranged to protrude toward the suction port 15 (see FIG. 9). As shown in FIG. 10, at least two of the pump casing 2 side, one side (first side) 60C of the cooling jacket 60, and the other side (second side) 60D of the cooling jacket 60 A terminal box 100 is placed inside the side. With this arrangement, as shown in FIG. 10, even if the motor pump is placed close to any of the walls WL1 to WL3, the wiring work space for the terminal box 100 is not provided on the wall WL1 to WL3 side. , can be placed in a smaller space. In other words, by arranging the wiring port (wire outlet) 102 facing the same direction as the suction port 15a, which requires space for piping work, there is a space for piping work to the suction port 15a and a wiring space for the terminal box 100. is shared. This ensures sufficient wiring space for the terminal box 100 and improves work efficiency. In addition, in this embodiment, the wiring port 102 is arranged facing the same direction as the suction port 15a, but as one embodiment, the wiring port 102 may be arranged facing the same direction as the discharge port 16a. In this case as well, the work space for piping to the discharge port 16a and the wiring space for the terminal box 100 are shared, so that the efficiency of wiring work for the terminal box 100 is improved.

The terminal box 100 includes a terminal box main body 100a and a lid 100b that closes the terminal box main body 100a. Motor pumps may be installed in locations where there is a risk of ignition and explosion due to flammable gases or flammable liquids. In order to improve the safety of surrounding equipment, even if an explosion occurs due to explosive gas inside the terminal box 100, the terminal box 100 is designed to withstand the pressure and to prevent the risk of igniting the explosive gas outside. It is desirable to adopt a fully enclosed, pressure-resistant, explosion-proof structure.

Therefore, the lid 100b is fastened to the terminal box body 100a by the fastener 101. More specifically, as shown in FIG. 8, the fastener 101 is a through bolt that extends through the terminal box body 100a and extends to the motor casing 3. Therefore, with the terminal box body 100a sandwiched between the lid 100b and the motor casing 3, the fastener 101 is inserted into the lid 100b and the terminal box body 100a, and the fastener 101 is tightened. The motor can be fixed to the pump. Note that, as shown in FIG. 8, the plurality of fasteners 101 may be collectively referred to as a fastener 101a.

Further, as shown in FIG. 9, the terminal box 100 may be placed in a position protruding from the suction port 15a of the motor pump. A fastener 101 located at a position protruding from the cooling jacket 60 is a fastener that fastens the lid 100b to the terminal box body 100a.

Note that when the lid 100b is fastened to the terminal box body 100a with the fastener 101, the fastener 101 extends in the vertical direction. In other words, the space required for the fastening work of the discharge port 16a is arranged facing the same direction as the discharge port 16a, which requires space for piping work, so that the space for piping work to the discharge port 16a and the fastener 101 are Fastening space is shared. As a result, a sufficient fastening space for the fastener 101 is ensured and work efficiency is improved. In addition, in this embodiment, the fastener 101 is arranged to extend in the same vertical direction as the discharge port 16a, but as one embodiment, the fastener 101 may be arranged facing the same direction as the suction port 15a. In this case as well, since the work space for piping to the suction port 15a and the work space for fastening the fastener 101 are shared, the efficiency of the work for fastening the fastener 101 is increased.

FIG. 11 is a diagram showing a terminal box 100 placed below the motor pump. FIG. 12 is a side view of the terminal box 100 placed below the motor pump. Also in the embodiment shown in FIGS. 11 and 12, the terminal box 100 is arranged to protrude toward the suction port 15 (see FIG. 12). Also in the embodiment shown in FIGS. 11 and 12, the pump casing 2 side, one side surface (first side surface) 60C side of the cooling jacket 60, and the other side surface (second side surface) 60D side of the cooling jacket 60 The terminal box 100 is arranged inside at least two of the sides. Such an arrangement allows the terminal box 100 to be arranged in a smaller space. In other words, even if the motor pump is placed close to any of the walls WL1 to WL3, the wiring work space for the terminal box 100 can be placed in a smaller space without providing it on the wall WL1 to WL3 side.

The wiring port 102 is arranged facing the same direction as the suction port 15. More specifically, the wiring port 102 is arranged diagonally below the suction port 15, the coolant inlet 60A, and the coolant outlet 60B (see FIG. 11). With this arrangement, the cable can be connected to a terminal block (not shown) in the terminal box 100 through the wiring port 102 without contacting any of the suction port 15, the coolant inlet 60A, and the coolant outlet 60B. It is possible. Further, in the event that liquid leaks from any one of the suction port 15, the coolant inlet 60A, and the coolant outlet 60B, it is possible to prevent the wires wired to the terminal box 100 from being exposed to water.

The lid 100b is fastened to the terminal box body 100a by a fastener 103. More specifically, as shown in FIG. 12, the lid 100b is configured to close the side surface of the terminal box body 100a. The terminal box 100 can be assembled by inserting the fastener 103 into the lid 100b and the terminal box main body 100a and tightening the fastener 103 with the lid 100b in contact with the terminal box main body 100a. When the lid 100b is fastened to the terminal box body 100a with the fastener 103, the fastener 101 extends in the horizontal direction.

In this way, whether the terminal box 100 is placed above the motor pump or below the motor pump, only the suction port 15 side is visible when the terminal box 100 is viewed from above. , is placed overflowing. Therefore, even if the motor pump is equipped with the terminal box 100 which is larger in size due to its pressure-resistant and explosion-proof structure, the installation space of the motor pump can be saved.

In the above motor pump, the temperature of the liquid to be handled (eg, water, silicone oil, etc.) may range from low (eg, -25 degrees) to high (eg, 160 degrees). Furthermore, when the motor stator becomes hot, the surface temperature of the motor casing that houses the motor stator also increases. Motor pumps may be installed in locations where there is a risk of ignition and explosion due to flammable gases or flammable liquids. If the motor pump is equipped with the above-mentioned cooling jacket 60, it is possible to suppress an increase in the surface temperature of the motor casing 3 even when handling high-temperature liquid. Furthermore, by having the cooling jacket 60, even if the motor pump is installed in a place where there is a risk of ignition and explosion due to flammable gas or flammable liquid, an explosion due to the explosive gas will not occur inside the cooling jacket 60. In addition, the cooling jacket 60 can withstand the pressure and has a completely enclosed, pressure-resistant and explosion-proof structure that prevents the risk of igniting external explosive gas, thereby improving the safety of surrounding equipment. .

FIG. 13 is a diagram showing still another embodiment of a cooling mechanism that suppresses an increase in the surface temperature of the motor casing 3. In the embodiment shown in FIG. 13, no cooling jacket 60 is provided, and instead the motor pump is provided with cooling channels 65 formed inside the motor casing 3. The cooling channel 65 is arranged to surround the motor stator 6, and a cooling fluid flows inside the cooling channel 65. Such a configuration can also provide the same effects as the motor pump according to the embodiment described above.

FIG. 14 is a diagram showing still another embodiment of the motor pump. For example, instead of a terminal block as shown in FIGS. 8 to 12, the motor pump may have a cable entry port 200 formed in the cover plate 20a. In the embodiment shown in FIG. 14, a cable entry port 200 is provided on a surface different from the surface provided with the cooling flow path 65, and a cable (for example, a signal line or a power line) is pulled out from the cable entry port 200. ing. In particular, in the case of a pressure-resistant and explosion-proof structure, the structure of the cable entry port 200 becomes complicated and large to prevent ignition and explosion due to flammable gas or flammable liquid. Therefore, even if the cable lead-in port 200 becomes larger due to the pressure-resistant and explosion-proof structure, the motor pump can be made more compact by arranging the cable lead-in port 200 on a different surface from the cooling flow path 65. In particular, if the suction port 15a and the cable lead-in port 200 are arranged in the same direction as in this embodiment, the piping work space to the suction port 15a and the cable lead-in port 200 are shared, so the motor pump can be made more compact. . However, in one embodiment, the cable entry port 200 may be located at a similar location to the terminal box 100.

In addition, in all the above-mentioned motor pumps, the heat radiating member 20 or the suction port 15 may not be provided. In that case, instead of the heat radiating member 20 or the suction port 15, the motor casing 3 or a cover that closes the opening of the motor casing 3 may form the suction port 15a. Furthermore, as shown in FIG. 4, the outer peripheral surface of the motor casing 3 is rectangular. However, the shape of the motor casing 3 is not limited to this, and may be, for example, a cylindrical shape or a polygonal shape extending along the direction CL in which the cooling channel 65 extends.

As described above, the suction port 15a and the discharge port 16b of the motor pump are connected to piping for communication with upstream or downstream equipment and equipment. For example, if the end of the piping connected to the motor pump has a flange and is connected to the motor pump at the flange, the motor pump is also provided with the same type of flange and fasteners (e.g. bolts and nuts) are used. Join both flanges with. For example, a flange conforming to JIS standards is used. It is also necessary to provide a working space for accessing piping and fasteners such as flanges. Therefore, regardless of the size of the motor pump, there was a problem in that the installation space was uniformly large. Furthermore, the type of flange connected to the motor pump differs depending on the conveyed liquid, equipment, equipment, etc. Therefore, in the following embodiments, a motor pump that realizes a compact installation space even with flange connection and is compatible with various types of flanges will be described with reference to the drawings.

FIG. 15 is a diagram showing still another embodiment of the motor pump. As shown in FIG. 15, the motor pump includes a flange connection portion 300 in which a suction port for the liquid flow path X is formed. In the following embodiments, a functional structure different from that of the motor pump shown in FIG. 14 will be mainly described. The flange connection portion 300 corresponds to the heat dissipation member 20 according to the embodiment described above. Therefore, the flange connection portion 300 includes a cover plate 300a that corresponds to the cover plate 20a, and a fixing ring 300b that corresponds to the fixing ring 20b. In this embodiment, the motor casing 3, cover plate 300a, fixing ring 300b, and suction port 15 are constructed from separate parts. However, in one embodiment, at least two of the motor casing 3, cover plate 300a, fixing ring 300b, and suction port 15 may be integrally configured.

The flange connection part 300 has a flange facing surface 301 facing a flange member 310 connected to a motor pump, and a threaded part 302 into which a fastener 311 formed on the flange facing surface 301 can be screwed. There is. In the embodiment shown in FIG. 15, fastener 311 is a screw. The threaded portion 302 is a thread groove formed in a direction extending along the liquid flow path X from the flange facing surface 301. In one embodiment, the threaded part 302 is a threaded part protruding from the flange facing surface 301, and the fastener 311 may be a nut that can be threaded into this threaded part (threaded part) 302.

A through hole 310a through which a fastener 311 passes is formed in the flange member 310. With the flange member 310 in contact with the flange-facing surface 301 of the flange connection part 300, the fastener 311 is inserted into the through hole 310a and the threaded part 302, and the fastener 311 is tightened, so that the flange member 310 is connected to the flange. 300. Note that the flange member 310 and the flange facing surface 301 may be connected via a sealing member (such as a gasket or an O-ring) not shown.

In this way, since the motor pump is equipped with the flange connection part 300, even if the flange member 310 is connected to the motor pump, that is, even if the piping is flange connected, the motor pump can be made more compact. Can be done. Moreover, in this embodiment, the installation space for the motor pump can be made compact.

It is preferable that the flange connection portion 300 is removably attached to the motor casing 3. More specifically, as shown in FIG. 15, the flange connection part 300 has a mounting part 303 that can be mounted on the motor casing 3. The motor casing 3 has a shape corresponding to the mounting part 303 of the flange connection part 300, and the flange connection part 300 can be mounted to the motor casing 3 via the mounting part 303. In one embodiment, the mounting portion 303 has a threaded structure, and the flange connection portion 300 is mounted on the motor casing 3 by threading. In another embodiment, the mounting portion 303 has a fitting structure, and the flange connection portion 300 is fitted to the motor casing 3 by fitting. Furthermore, in other embodiments, the flange connection 300 is attached to the motor casing 3 with fasteners (eg bolts and nuts). In the motor pump of this embodiment, since the flange connection part 300 is removable from the motor casing 3, it is possible to accommodate various types of flanges by changing the design of the flange connection part 300. Here, as a comparative example, in order to accommodate different flanges, a method of providing flanges at the suction port 15a and the discharge port 16b via nipples will be mentioned. According to the method of the comparative example, the conveyed liquid may leak from the connection between the nipple and the flange. In this embodiment, since the flange connection part 300 is attached to the motor casing 3, it can be sealed over a wider area than in the comparative example, so that it is also possible to prevent leakage of the conveyed liquid.

As shown in FIG. 15, the flange connection portion 300 has a communication channel 315 through which fluid for cooling the motor stator 6 flows. The communication channel 315 is formed inside the flange connection part 300 and is adjacent to the motor stator 6. The motor casing 3 has a cooling passage 65 formed therein, and the communication passage 315 preferably communicates with the cooling passage 65. More specifically, the communication channel 315 and the cooling channel 65 communicate with each other through the communication channel 316. The communication path 316 is made up of a part of the motor casing 3 and a part of the flange connection part 300.

The motor casing 3 has entrances and exits 320A and 320B connected to the cooling channel 65. The fluid having a temperature lower than that of the carrier liquid is introduced into the cooling channel 65 inside the motor casing 3 through either the inlet/outlet 320A or 320B (in the embodiment shown in FIG. 15, the inlet/outlet 320A). In this embodiment, the entrance/exit 320A is formed at the lower part of the motor casing 3, and the entrance/exit 320B is formed at the upper part of the motor casing 3. However, the openings 320A and 320B may be provided on the outer peripheral surface of the motor casing 3 and/or the flange connection portion 300 without relying on this. For example, the openings 320A and 320B may be formed on an extension of the axis CL of the motor casing 3 and/or the flange connection part 300, or both the entrances and exits 320A and 320B may be formed in the upper or lower part of the motor casing 3 and/or the flange connection part 300. .

The fluid introduced into the cooling passage 65 flows into the communication passage 315 through the communication passage 316, and the cooling passage 65, the communication passage 316, and the communication passage 315 are filled with the cooling liquid. In this state, the coolant flows out from the entrance/exit port 320B. In this way, the motor stator 6 is cooled by the cooling fluid flowing through the cooling channel 65 and the communication channel 315. Note that if the motor stator 6 does not require cooling, the cooling channel 65, the communication channel 315, etc. may be omitted.

FIG. 16 is a diagram showing still another embodiment of the motor pump. The configuration of this embodiment, which is not particularly described, is the same as the embodiment described above, so the redundant explanation will be omitted. As shown in FIG. 16, the motor pump includes a flange connection portion 330 in which a discharge port is formed. The flange connection part 330 has a flange facing surface 331 that faces the flange member 310 and a threaded part 332 into which the fastener 311 can be threaded.

In the embodiments described above, the motor pump is an end-top type motor pump, but the motor pump according to the embodiment shown in FIG. 16 is an in-line type motor pump in which the suction port 15a and the discharge port 16a are aligned in a straight line. Also in the embodiment shown in FIG. 16, with the flange member 310 in contact with the flange facing surface 331 of the flange connection part 330, the fastener 311 is inserted into the through hole 310a and the threaded part 332, and the fastener 311 is tightened. Thereby, the flange member 310 is connected to the flange connection part 330.

In the embodiment shown in FIG. 16, the flange connection part 330 is removable from the pump casing 2. More specifically, as shown in FIG. 16, the flange connection part 330 has a mounting part 333 that can be mounted on the pump casing 2. The pump casing 2 has a shape corresponding to the attachment part 333 of the flange connection part 330, and the flange connection part 330 can be attached to the pump casing 2 via the attachment part 333. In one embodiment, the mounting part 333 may have a threaded structure, and in another embodiment, the mounting part 333 may have a fitting structure, and the flange connection part 330 and the pump casing 2 and may be fastened with some kind of fastener. Note that the mounting portion 303 shown in FIG. 15 is formed on the outer peripheral side of the flange connection portion 300. Similarly, the mounting part 333 may be formed on the outer peripheral side of the flange connection part 330, or the mounting part 303 shown in FIG. 15 may be formed on the liquid flow path X side similarly to the mounting part 333. .

The embodiment shown in FIG. 15 and the embodiment shown in FIG. 16 may be combined. That is, the motor pump may include the flange connection part 300 shown in FIG. 15 and the flange connection part 330 shown in FIG. 16. In such a configuration, the motor pump can be flange-connected to upstream equipment and downstream equipment. In addition, the motor pump can be installed compactly and can be easily adapted to various connection methods and flanges.

FIG. 17 is a diagram showing still another embodiment of the motor pump. The configuration of this embodiment, which is not particularly described, is the same as the embodiment described above, so the redundant explanation will be omitted. As shown in FIG. 17, the embodiment shown in FIG. 1 and the embodiment shown in FIG. 15 may be combined. More specifically, the motor pump includes a cooling jacket 60, a communication passage 315, and a communication passage 336 that allows the cooling jacket 60 and the communication passage 315 to communicate with each other. Note that the cooling jacket 60 and the flange connection portion 300 may be integrally configured.

Note that the embodiments described above may be combined as much as possible. The motor pump may include the configuration according to the embodiment shown in FIGS. 1 to 14 and the configuration according to the embodiment shown in FIGS. 15 to 16.

The embodiments described above have been described to enable those skilled in the art to carry out the invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the invention is not limited to the described embodiments, but is to be construed in the broadest scope according to the spirit defined by the claims.

1 Impeller 2 Pump casing 3 Motor casing 3a Liquid flow path 3b Screw hole 3c Outer circumferential surface 5 Permanent magnet 6 Motor stator 6A Stator core 6B Stator coil 9 O-ring 10 Bearing 10a Liquid flow path 11 Rotating side bearing 12 Fixed side Bearing 12a Radial surface 12b Thrust surface 13 O-ring 15 Suction port 15a Suction port 15b Liquid flow path 15c Base 15d Shaft portion 15e Threaded portion 15f Annular groove 16 Discharge port 16a Discharge port 20 Heat radiation member 20a Cover plate 20b Fixing ring 32 Side wall portion 60 Cooling jacket 60a Motor casing side part (first part)
60b Heat dissipation member side part (second part)
60A Coolant inlet 60B Coolant outlet 61 Inner surface 62 Recess 63 Heat dissipation member side surface (first surface)
65 First cooling channel 66 Opposite surface (second surface)
67 Groove 68 Communication channel 70 Second cooling channel 75, 75A, 75B Reinforcement rib 100 Terminal box 100a Terminal box body 100b Lid 101 Fastener 102 Wiring port 103 Fastener 200 Cable entry port 300 Flange connection portion 300a Cover plate 300b Fixing Ring 301 Flange facing surface 302 Screwing part 303 Mounting part 310 Flange member 310a Through hole 311 Fastener 315 Communication passage 316 Communication passage 320A, 320B Opening/exit 330 Flange connecting part 331 Flange facing surface 332 Screwing part 333 Mounting part

Claims (7)

A motor pump,
An impeller with a permanent magnet embedded in it,
a pump casing that houses the impeller;
a motor stator having a plurality of stator coils;
a motor casing that houses the motor stator;
a liquid flow path formed in the center of the motor casing, through which the carrier liquid conveyed by the impeller passes;
a flange connection part in which a suction port or a discharge port of the liquid flow path is formed,
The motor pump includes a cooling channel formed in the motor casing through which a fluid having a temperature lower than that of the carrier liquid flows,
The cooling flow path is formed inside the motor casing ,
The flange connection portion forms a suction port for the liquid flow path, and has a communication flow path through which a fluid for cooling the motor stator flows;
The communication flow path is formed inside the flange connection portion of the motor pump. The flange connection part is
a flange facing surface facing a flange member connected to the motor pump;
The motor pump according to claim 1, further comprising a threaded portion formed on the flange facing surface into which a fastener for fastening the motor pump and the flange member can be threaded. The motor pump according to claim 1 or 2, wherein the flange connection part is detachable from the pump casing or the motor casing. The motor pump according to claim 1, wherein the communication passage formed in the flange connection portion communicates with a cooling passage in the motor casing through which cooling fluid flows. The motor pump includes a cooling jacket through which a cooling fluid having a temperature lower than that of the conveying liquid flows,
The motor pump according to any one of claims 1 to 4 , wherein the cooling jacket covers at least an outer peripheral surface of the motor casing. The motor pump according to claim 5 , wherein the communication passage formed in the flange connection portion and a cooling passage of the cooling jacket through which a cooling fluid flows are in communication. The motor pump according to any one of claims 1 to 6 , wherein the cooling flow path is arranged to surround the motor stator.

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