JP2021173249A - Motor pump - Google Patents

Abstract

To provide a motor pump that is compact even when being connected by means of flange connection.SOLUTION: A motor pump includes: a liquid flow passage X which is formed in a center part of a motor casing 3 and through which transported liquid that is transported by an impeller 1 passes; and a flange connection part in which a suction port or discharge port of the liquid flow passage X is formed.SELECTED DRAWING: Figure 15

Description

The present invention relates to a motor pump that rotates an impeller in which a permanent magnet is embedded by 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 arranged so as to face the impeller. The impeller is rotatably supported by bearings.

The motor stator has a plurality of stator coils, and when a three-phase current is passed through these stator coils, a rotating magnetic field is generated. This rotating magnetic field acts on the permanent magnets embedded in the impeller and drives the impeller to rotate. Since the liquid handled by the pump leaks when it comes into contact with the motor stator, a motor casing is provided between the motor stator and the impeller, and the motor casing prevents the liquid from entering the motor stator. ing. Further, in this motor pump, a flow path (liquid flow path) of a transport liquid is formed in the center of a motor stator, and the transport liquid that has passed through the liquid flow path is pressurized and sent by an impeller.

Japanese Unexamined Patent Publication No. 2016-169734

Piping that communicates with equipment and facilities on the upstream side or downstream side is connected to the suction port and the discharge port of the motor pump. Therefore, it is necessary to provide a connection method according to the application of the motor pump and the equipment to be communicated with.

For example, when the piping connected to the motor pump is a flange connection, if the motor pump is provided with a flange and connected with a fastener, the installation space of the motor pump including the piping becomes large. Further, if flanges are provided at the suction port and the discharge port of the motor pump with a nipple or the like, 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 flange-connected.

In one aspect, an impeller in which a permanent magnet is embedded, a pump casing accommodating the impeller, a motor stator having a plurality of stator coils, a motor casing accommodating the motor stator, and the motor casing. A motor pump comprising a liquid flow path formed in a central portion of the above and through which a conveyed liquid conveyed by the impeller passes, and a flange connecting portion formed with a suction port or a discharge port of the liquid flow path. Provided.

In one aspect, the flange connecting portion includes a flange facing surface facing the 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 screwable portion that can be screwed.
In one aspect, the flange connection is removable to and from the pump casing or motor casing.
In one aspect, the flange connection 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.

In one aspect, the motor pump includes a cooling flow path through which a fluid having a temperature lower than that of the transport liquid formed in the motor casing flows.
In one aspect, the communication flow path formed in the flange connecting portion and the cooling flow path of the motor casing through which the cooling fluid flows communicate with each other.
In one aspect, the motor pump comprises a cooling jacket through which a cooling fluid having a temperature lower than that of the transport liquid flows, and the cooling jacket covers at least the outer peripheral surface of the motor casing.
In one aspect, the communication flow path formed in the flange connection portion and the cooling flow path of the cooling jacket through which the cooling fluid flows communicate with each other.

Since the motor pump includes a flange connecting portion, the size of the motor pump can be reduced even if the flange member is connected to the motor pump.

It is sectional drawing which shows one Embodiment of a motor pump. It is a figure which shows the other embodiment of a motor pump. It is a figure which shows the other embodiment of a cooling jacket. FIG. 3 is a cross-sectional view taken along the line AA of FIG. It is a figure which shows still another embodiment of a cooling jacket. It is a figure which shows one Embodiment of the cooling jacket composed of the detachable split body. It is a figure which shows the other embodiment of the cooling jacket composed of the detachable split body. It is a figure which shows the terminal box placed on the motor pump. It is a side view of the terminal box placed on the motor pump. It is the figure which looked at the terminal box placed on the motor pump from the top. It is a figure which shows the terminal box arranged below the motor pump. It is a side view of the terminal box arranged below the motor pump. It is a figure which shows still another embodiment of the cooling mechanism which suppresses the rise of the surface temperature of a motor casing. It is a figure which shows still another embodiment of a motor pump. It is a figure which shows still another embodiment of a motor pump. It is a figure which shows still another embodiment of a motor pump. It is a figure which shows still another embodiment of a motor pump.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an 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 a magnetic force acting on these permanent magnets 5, a pump casing 2 that houses the impeller 1, and a motor fixing. It includes a motor casing 3 for accommodating the child 6, and a bearing assembly 10 for supporting the radial load and the thrust load of the impeller 1. The motor stator 6 and the bearing assembly 10 are arranged on the suction side of the 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 through a minute gap, 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. The bearing assembly 10 is a slide bearing (dynamic pressure bearing) that utilizes the dynamic pressure of a liquid. The bearing assembly 10 is composed of a combination of a rotary side bearing 11 and a fixed side bearing 12 that are loosely engaged with each other. The rotary 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. The 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, the inner peripheral surface of the rotating side bearing 11 faces the radial surface 12a of the fixed side bearing 12, and the side surface of the rotating side bearing 11 is the thrust surface 12b of the fixed side bearing 12. Facing. A minute gap is formed between the inner peripheral surface of the rotary side bearing 11 and the radial surface 12a, and between the side surface of the rotary side bearing 11 and the thrust surface 12b. Further, a spiral groove (not shown) for generating dynamic pressure is formed on the inner peripheral surface and the side surface of the rotary side bearing 11.

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

A suction port 15 having a suction port 15a is fixed to the motor casing 3. The suction port 15 is made of a metal such as stainless steel and is connected to a suction line (not shown). A liquid flow path X is formed at the center of the suction port 15, the motor casing 3, and the bearing assembly 10. These liquid flow paths X are connected in a row to form one cooling flow path 65 extending from the suction port 15a to the liquid inlet of the impeller 1. In the present specification, the reference numeral CL indicates the extending direction of the cooling flow path 65.

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

The screw portion 15e is not formed on the outer peripheral surface of the shaft portion 15d on the tip end side. An annular groove 15f is provided on the outer peripheral surface of the shaft portion 15d in which 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 in 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 boosted by the rotating impeller 1 is discharged through the discharge port 16a. The motor pump according to the present embodiment is a so-called end-top type motor pump in which the suction port 15a and the discharge port 16a are orthogonal to each other.

When the impeller 1 rotates, the liquid is introduced into the liquid inlet of the impeller 1 from the suction port 15a of the motor pump. The liquid is boosted by the rotation of the impeller 1 and 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 boosted liquid. Since the bearing assembly 10 is arranged on the suction side of the impeller 1, the thrust load of the impeller 1 is supported from the suction side. According to the configuration according to the present embodiment, since the radial load and the thrust load of the impeller 1 can be supported by one bearing assembly 10 in a non-contact manner, a compact motor pump with less generation of particles can be realized. Can be done.

As shown in FIG. 1, the side wall portion 32 of the motor casing 3 is arranged so as 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 separates the impeller 1 and the motor stator 6. The rotating magnetic field generated by the motor stator 6 reaches the permanent magnet 5 of the impeller 1 through the side wall portion 32. 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 the present embodiment is provided with a heat radiating member 20 that comes into contact with the stator core 6A of the motor stator 6 and the suction port 15. The heat radiating member 20 is mounted on the motor casing 3 and is made of a material having a 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 accommodated in an accommodation space formed in the motor casing 3, and the accommodation space is closed by the heat radiating member 20 as shown in FIG. Therefore, the heat radiating member 20 of the present embodiment is used as a motor cover that closes the accommodation space of the motor stator 6. The heat radiating member 20 includes a cover plate 20a that closes the accommodation space of the motor stator 6, and a fixing ring 20b that projects from the surface of the cover plate 20a toward the motor stator 6. These cover plates 20a and the fixing ring 20b are integrally formed. The cover plate 20a and the fixing ring 20b constituting the heat radiating member 20 may be separate members. In this case as well, the cover plate 20a and the fixing ring 20b are both made of a material having a 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 thereof. The screw portion 15e of the suction port 15 is inserted into the screw hole 3b of the motor casing 3, and a part of the cover plate 20a of the heat radiating 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. As described above, the heat radiating member 20 of the present embodiment comes into contact with the stator core 6A and the suction port 15 and also functions as a fixing member for fixing the position of the motor stator 6.

When a current is passed through the stator coil 6B of the motor stator 6, the stator coil 6B generates heat. A part of the heat is transferred to the liquid through the side wall portion 32 of the motor casing 3, and the other part is dissipated to the outside air through the motor casing 3 and the heat radiating member 20. The heat generated by the motor stator 6 comes into contact with the stator core 6A of the motor stator 6 and is transmitted to the heat radiating member 20 having a higher thermal conductivity than the motor casing 3, and the heat radiating member 20 efficiently releases the outside air. Is dissipated in.

Further, the 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 in the liquid flow path 15b. Therefore, the heat transferred to the suction port 15 is transferred to the liquid flowing in the liquid flow path 15b. As a result, the heat generated by the motor stator 6 can be more efficiently dissipated to the outside of the motor pump, so that the temperature rise of the motor stator 6 can be efficiently suppressed.

When a high-temperature liquid is transferred by the motor pump described above, the motor stator 6 becomes hot and the operation is stopped due to the detection of a temperature abnormality, or in the worst case, the motor stator 6 fails and cannot be operated. There is a risk of burning or burning. Here, the detection of temperature abnormality means that the control device of the motor pump determines that the temperature is abnormal when the detection value of the temperature sensor (not shown) attached to the motor pump exceeds the threshold value, and stops the motor pump. It is to avoid burning of the motor pump. Therefore, in order to improve the cooling efficiency of the motor casing 3, the motor pump includes a cooling jacket 60 that covers the motor casing 3. Hereinafter, the structure of the cooling jacket 60 will be described 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 forming the cooling flow path 65 through which the cooling liquid flows is attached to the outer peripheral surface 3c of the motor casing 3. However, the cooling liquid flowing in the cooling flow path 65 is an example of a cooling fluid, and the cooling fluid may be a liquid such as tap water, factory water, antifreeze liquid (for example, propylene glycol), or a gas. good.

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

The cooling jacket 60 has a cooling flow path 65 through which the cooling liquid flows. More specifically, the cooling jacket 60 has a recess 62 formed on the inner surface 61 thereof, 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 is in direct contact with the outer peripheral surface 3c of the motor casing 3, so that the temperature rise of the motor pump can be suppressed. Further, by changing the shape and material of the cooling flow path 65, the motor pump can handle the conveyed liquid having a wide range of temperatures.

The cooling flow path 65 communicates with the coolant inlet 60A and the coolant outlet 60B. The coolant (for example, tap water) flows into the cooling flow path 65 from a coolant supply source (not shown) through the coolant inlet 60A. The coolant flowing into the cooling flow path 65 comes into contact with the outer peripheral surface 3c of the motor casing 3 to cool the motor casing 3. After that, the coolant flows inside the cooling flow path 65 and is discharged from the coolant outlet 60B. In the present embodiment, the coolant flows in from the coolant inlet 60A and is discharged from the coolant outlet 60B. However, it is sufficient that the cooling liquid of the cooling jacket 60 suppresses the temperature rise of the motor pump, and in one embodiment, a cooling liquid such as antifreeze liquid may be sealed in the cooling flow path 65.

In the present embodiment, both the coolant inlet 60A and the coolant outlet 60B are formed on a surface 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 that the work space for the pipe can be piped. The installation space of the motor pump including the above can be reduced.

According to the present embodiment, the motor pump includes a cooling jacket 60 that cools the motor casing 3 by contacting the coolant with the outer peripheral surface 3c of the motor casing 3. Therefore, even when transporting a high-temperature liquid, the cooling jacket 60 can suppress the temperature rise of the motor pump while suppressing the temperature drop of the transport liquid. A motor pump having such a structure is particularly effective for an application of transporting a high temperature liquid.

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, when the liquid conveyed by the motor pump has a high temperature, the motor pump may be operated with the cooling jacket 60 attached to the motor casing 3. As described above, the cooling jacket 60 is removable depending on the type of liquid to be conveyed. Further, if the cooling jacket 60 has a pressure-resistant explosion-proof function, the motor pump can be made into a pressure-resistant explosion-proof device by attaching the cooling jacket 60.

FIG. 2 is a diagram showing another embodiment of the motor pump. Since the configuration and operation / effect of the present embodiment not particularly described are the same as those of the above-described embodiment, the duplicated description will be omitted. As shown in FIG. 2, the cooling jacket 60 may include a coolant inlet 60A arranged on the same surface as the suction port 15a and a coolant outlet 60B arranged in the same direction as the discharge port 16a. Specifically, in the cooling jacket 60, the suction port 15a extending parallel to the CL direction of the liquid flow path X and the coolant inlet 60A are arranged in the same direction and extend perpendicularly to the CL direction of the liquid flow path X. The discharge port 16a and the coolant outlet 60B are arranged in the same direction. In one embodiment, in the cooling jacket 60, the discharge port 16a and the coolant inlet 60A may be arranged in the same direction, and the suction port 15a and the coolant outlet 60B may be arranged in the same direction. Both the coolant inlet 60A and the coolant outlet 60B may be arranged in the same direction.

As described above, 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 formed in the same direction as the suction port 15a can be piped in the same direction, so that the work space of the pipe can be increased. The installation space of the motor pump including it can be reduced.

The transport liquid of the motor pump of the present embodiment may be a flammable liquid having a risk of flammable explosion. In that case, it is installed in a box that surrounds it. In the cooling jacket 60 of the above-described embodiment, since the coolant inlet 60A and the coolant outlet 60B are arranged in the same direction as the suction port 15a and the discharge port 16a, the installation space can be reduced and the space inside the box is limited. Can be used effectively.

FIG. 3 is a diagram showing another embodiment of the cooling jacket 60. Since the configuration and operation / effect of the present embodiment not particularly described are the same as those of the above-described embodiment, the duplicated description will be omitted. As shown in FIG. 3, the cooling jacket 60 has a motor casing side portion (first portion) 60a that covers the outer peripheral surface 3c of the motor casing 3 and a motor casing side portion 60a toward the suction port 15, that is, the motor casing. It has a heat radiating member side portion (second portion) 60b extending toward the central portion of the 60. The heat radiating member side portion 60b is attached to the heat radiating member 20.

The cooling jacket 60 has a first cooling flow path 65 formed along the outer peripheral surface of the motor casing 3 and a second cooling flow path 70 communicating with the first cooling flow path 65 and in contact with the heat radiating member 20. I have. The motor casing side portion 60a has a recess 62 formed on the inner surface 61 thereof, and the recess 62 forms the first cooling flow path 65. The heat radiating member side portion 60b has a surface (first surface) 63 on the heat radiating member side and a surface (second surface) 66 opposite to the first surface 63, which are in contact with the heat radiating member 20. .. Further, the coolant inlet 60A and the coolant outlet 60B are formed on the second surface 66 forming the second cooling flow path 70.

A groove 67 connected to the coolant inlet 60A and the coolant outlet 60B is formed on the first surface 63. In the present 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 the center thereof may be arranged at a position different from that of the suction port 15. A second cooling flow path 70 is formed between the groove portion 67 and the heat radiating member 20. A communication flow path 68 is arranged between the groove portion 67 and the recess 62, and the first cooling flow path 65 and the second cooling flow path 70 communicate with each other through the communication flow path 68. The coolant inlet 60A and the coolant outlet 60B provided in the second cooling flow path 70 communicate with the first cooling flow path 65 through the second cooling flow path 70.

FIG. 4 is a cross-sectional view taken along the line AA of FIG. In the embodiment shown in FIGS. 3 and 4, the coolant flowing into the second cooling flow path 70 through the coolant inlet 60A cools the motor stator 6 through the heat radiating member 20. Further, the coolant is also in contact with the heat radiating member 20, and can indirectly take away the heat of the motor casing 3 (that is, through the heat radiating member 20). That is, in the present embodiment, the motor casing 3 can be cooled not only from the outer peripheral surface parallel to the CL direction but also from the outside of the surface perpendicular to the CL direction. Further, in the present embodiment, since the coolant inlet 60A and the coolant outlet 60B are formed on the outside of the suction port 15a, the motor pump can be conveyed while maintaining the temperature of the conveyed liquid. That is, the transport liquid passing through the central portion of the motor casing 3 is difficult to be cooled by the coolant.

When the supply of the coolant is continued, the coolant flows through the entire second cooling flow path 70, flows to the outside through the coolant outlet 60B, and flows into the first cooling flow path 65 through the communication flow path 68. .. The coolant flowing into the first cooling flow path 65 comes into contact with 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 through the entire first cooling flow path 65, and flows to the outside through the coolant outlet 60B.

As described above, when the supply of the cooling liquid is continued, the cooling liquid fills the first cooling flow path 65, the second cooling flow path 70, and the communication flow path 68, and suppresses the temperature rise of the motor pump. can.

In the embodiment shown in FIG. 4, the communication flow path 68 is a radiation flow path that extends radially from the second cooling flow path 70, but is an annular flow path arranged so as to surround the second cooling flow path 70. It may be a flat surface extending over the cross section A. Further, the number and shape of the communication flow paths 68 are not limited to those shown in the drawings, and the communication flow paths 68 may be able to communicate with the first cooling flow path 65 and the second cooling flow path 70.

FIG. 5 is a diagram showing still another embodiment of the cooling jacket 60. Since the configuration and operation / effect of the present embodiment not particularly described are the same as those of the above-described embodiment, the duplicated description 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, the reinforcing rib 75 can increase the strength of the cooling jacket. Further, by providing the reinforcing rib 75, the surface area of the cooling jacket 60 can be increased, so that the cooling liquid that has taken away the heat of the motor casing 3 can be cooled more efficiently. That is, the reinforcing rib 75 has a function as a heat radiation fin. In one embodiment, the reinforcing rib 75 may be applied to the motor pump shown in FIGS. 1 and 2. When the transport liquid of the motor pump of the present embodiment is a flammable liquid having a risk of flammable explosion, or when the reinforcing rib 75 is installed in a place where there is a risk of flammable explosion due to a flammable gas or a flammable liquid. But you can drive safely.

FIG. 6 is a diagram showing an embodiment of a cooling jacket composed of a detachable split body. FIG. 7 is a diagram showing another embodiment of the cooling jacket composed of the detachable split body. As shown in FIG. 6, the cooling jacket having the cooling flow path through which the cooling liquid flows is composed of the first divided body 80A and the second divided body 80B which are detachable from each other. In the embodiment shown in FIG. 6, the cooling jacket 60 has a left-right split structure, and in the embodiment shown in FIG. 7, the cooling jacket 60 has a vertical split structure.

As shown in FIGS. 6 and 7, the first split body 80A has first side flanges 81 extending from both ends thereof, and the second split body 80B has second side flanges 82 extending from both ends thereof. It is preferable to do so. In the present embodiment, the first side flange 81 and the second side flange 82 can be fastened to each other by a fastener (for example, a bolt and a nut) 85 via a sealing member (not shown). However, regardless of this, it suffices as long as the first divided body 80A and the second divided body 80B can be watertightly fastened, and in one embodiment, a fitting type may be used. Since the cooling jacket 60 can be attached to and detached from the motor casing 3, the motor pump can be adapted to a wide temperature range depending on the presence or absence of the cooling jacket 60 and the design change.

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 X) are arranged in a straight line and are arranged on both sides of the first side. The flange 81 and the second side flange 82 are connected by a surface 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 explosion-proof structure, it is preferably made of a casting having superior strength. The positional relationship between the first side flange 81 and the second side flange 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. There is a manufacturing merit that the manufacturing process can be simplified.

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 side flange 81 and the second side flange 82 extend in the vertical direction. In the embodiment shown in FIG. 7, the coolant inlet 60A and the coolant outlet 60B are arranged in the horizontal direction, and the first side flange 81 and the second side flange 82 extend in the horizontal direction.

As shown in FIG. 6, the first side flange 81 and the second side flange 82 extend in the vertical direction, or as shown in FIG. 7, the first side flange 81 and the second side flange 82 extend in the horizontal direction. Therefore, the following effects can be obtained. That is, depending on the installation environment of the motor pump, there may be no space in the vertical direction of the motor pump or there may be no space in the horizontal direction of the paper surface of the motor pump. For example, when there is no space in the vertical direction of the motor pump, the cooling jacket 60 is arranged so that the first side flange 81 and the second side flange 82 extend in the horizontal direction (see FIG. 7), and the left and right sides of the motor pump are arranged. When there is no space in the direction, the cooling jacket 60 is arranged so that the first side flange 81 and the second side flange 82 extend in the vertical direction (see FIG. 6). As described above, the configuration that can be rotated and used as needed does not hinder the arrangement and work of the motor pump depending on the installation environment of the motor pump.

The detachable split structure described above may be applied to all the cooling jackets 60 described above. In particular, when the cooling jacket 60 has a pressure-resistant explosion-proof structure, the main body of the cooling jacket 60 becomes large. Therefore, by dividing the cooling jacket 60 into a split structure, it is possible to improve the workability of attaching / detaching and installing the piping and the like. Further, when the cooling jacket 60 has a pressure-resistant explosion-proof structure, the fastening structure between the first divided body 80A and the second divided body 80B is also increased in size. Therefore, the workability is improved by being able to select the arrangement of the cooling jacket 60. The cooling jacket 60 of the present embodiment becomes the cooling jacket of FIG. 7 when the cooling jacket 60 shown in FIG. 6 is rotated by 90 degrees. However, as 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 nice if the user could choose either one as needed.

FIG. 8 is a diagram showing a terminal box mounted on the 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 mounted on the motor pump. As shown in FIGS. 8 to 10, the terminal box 100 accommodating a member such as a terminal block (not shown) may be arranged on a motor pump (more specifically, a cooling jacket 60).

In the embodiment shown in FIGS. 8 to 10, the terminal box 100 is arranged so as to protrude from the suction port 15 side (see FIG. 9). As shown in FIG. 10, at least two of the pump casing 2 side, the side of one side surface (first side surface) 60C of the cooling jacket 60, and the side of the other side surface (second side surface) 60D of the cooling jacket 60. The terminal box 100 is arranged inside the side. With such an arrangement, as shown in FIG. 10, even if the motor pump is arranged close to any of the walls WL1 to WL3, the wiring work space of the terminal box 100 is not provided on the walls WL1 to WL3 side. , Can be placed in a smaller space. That is, since the wiring port (wiring outlet) 102 is arranged so as to face the same direction as the suction port 15a that requires a space for piping work, the piping work space to the suction port 15a and the wiring space of the terminal box 100 Is shared. As a result, a sufficient wiring space for the terminal box 100 is secured and work efficiency is improved. In the present embodiment, the wiring port 102 is arranged so as to face the same direction as the suction port 15a, but as one embodiment, the wiring port 102 may be arranged so as to face the same direction as the discharge port 16a. Also in this case, since the piping work space to the discharge port 16a and the wiring space of the terminal box 100 are shared, the wiring work efficiency of the terminal box 100 is improved.

The terminal box 100 includes a terminal box main body 100a and a lid 100b for closing the terminal box main body 100a. Motor pumps may be installed 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 inside the terminal box 100 due to explosive gas, the terminal box 100 can withstand the pressure and there is no risk of ignition of the external explosive gas. It is desirable to adopt a fully closed pressure-resistant explosion-proof structure.

Therefore, the lid 100b is fastened to the terminal box main body 100a by the fastener 101. More specifically, as shown in FIG. 8, the fastener 101 is a through bolt extending through the terminal box main 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 to tighten the terminal box 100. Can be fixed to the motor pump. As shown in FIG. 8, the plurality of fasteners 101 may be collectively referred to as fasteners 101a.

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

When the lid 100b is fastened to the terminal box main body 100a with the fastener 101, the fastener 101 extends in the vertical direction. That is, since the space required for the fastening work of the discharge port 16a is arranged so as to face the same direction as the discharge port 16a requiring the space for the piping work, the piping work space to the discharge port 16a and the fastener 101 The fastening space is shared. As a result, a sufficient space for fastening the fastener 101 is secured and work efficiency is improved. In the present embodiment, the fastener 101 is arranged so as to extend in the same vertical direction as the discharge port 16a, but as one embodiment, the fastener 101 may be arranged so as to face the same direction as the suction port 15a. Also in this case, since the piping work space to the suction port 15a and the fastening work space of the fastener 101 are shared, the efficiency of the fastening work of the fastener 101 is improved.

FIG. 11 is a diagram showing a terminal box 100 arranged below the motor pump. FIG. 12 is a side view of the terminal box 100 arranged below the motor pump. Also in the embodiments shown in FIGS. 11 and 12, the terminal box 100 is arranged so as to protrude from the suction port 15 side (see FIG. 12). Also in the embodiments shown in FIGS. 11 and 12, the side of the pump casing 2, the side of one side surface (first side surface) 60C of the cooling jacket 60, and the side of the other side surface (second side surface) 60D of the cooling jacket 60. Of these, the terminal box 100 is arranged inside at least two sides. With such an arrangement, the terminal box 100 can be arranged in a smaller space. That is, even if the motor pump is arranged close to any of the walls WL1 to WL3, the wiring work space of the terminal box 100 can be arranged in a smaller space without being provided on the wall WL1 to WL3 side.

The wiring port 102 is arranged so as to face 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 such an arrangement, the cable is connected to the terminal block (not shown) in the terminal box 100 through the wiring port 102 without touching any of the suction port 15, the coolant inlet 60A, and the coolant outlet 60B. It is possible. Further, in the unlikely event that liquid leaks from any of the suction port 15, the coolant inlet 60A, and the coolant outlet 60B, it is possible to prevent the wire wired to the terminal box 100 from being flooded.

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

In this way, regardless of whether the terminal box 100 is arranged above the motor pump or below the motor pump, only on the suction port 15 side when the terminal box 100 is viewed from above. , Is placed overhanging. Therefore, even if the motor pump is provided with the terminal box 100 having a pressure-resistant explosion-proof structure, the installation space of the motor pump can be saved.

In the above-mentioned motor pump, the temperature range of the handling liquid (for example, water, silicone oil, etc.) may be low (for example, -25 degrees) to high temperature (for example, 160 degrees). Further, when the temperature of the motor stator becomes high, the surface temperature of the motor casing accommodating the motor stator also rises. Motor pumps may be installed where there is a risk of ignition and explosion due to flammable gases or flammable liquids. A motor pump provided with the cooling jacket 60 described above can suppress an increase in the surface temperature of the motor casing 3 even when handling a high-temperature liquid. Further, by having the cooling jacket 60, even if the motor pump is installed in a place where there is a risk of ignition explosion due to flammable gas or flammable liquid, an explosion due to explosive gas occurs inside the cooling jacket 60. However, the cooling jacket 60 can withstand the pressure and can have a fully closed pressure-resistant explosion-proof structure so as not to ignite an external explosive gas, and the safety of surrounding equipment can be improved. ..

FIG. 13 is a diagram showing still another embodiment of the cooling mechanism that suppresses the rise in the surface temperature of the motor casing 3. In the embodiment shown in FIG. 13, the cooling jacket 60 is not provided, and instead, the motor pump includes a cooling flow path 65 formed inside the motor casing 3. The cooling flow path 65 is arranged so as to surround the motor stator 6, and a cooling fluid flows inside the cooling flow path 65. Even with such a configuration, it is possible to obtain the same effect as the effect of the motor pump according to the above-described embodiment.

FIG. 14 is a diagram showing still another embodiment of the motor pump. For example, instead of the terminal block as shown in FIGS. 8 to 12, the motor pump may have a cable inlet 200 formed in the cover plate 20a. In the embodiment shown in FIG. 14, a cable lead-in 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 drawn out from the cable lead-in port 200. ing. In particular, in the case of a pressure-resistant explosion-proof structure, the structure of the cable inlet 200 becomes complicated and large so as not to ignite and explode due to flammable gas or flammable liquid. Therefore, even if the cable lead-in port 200 becomes large due to the flameproof structure, the motor pump can be made compact by arranging the cable lead-in port 200 on a surface different 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 the present embodiment, the piping work space to the suction port 15a and the cable lead-in port 200 are shared, so that the motor pump can be made compact. .. However, in one embodiment, the cable lead-in port 200 may be arranged at the same position as the terminal box 100.

In all of 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. Further, 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 extending direction CL of the cooling flow path 65.

As described above, the suction port 15a and the discharge port 16b of the motor pump are connected with pipes for communicating with the equipment and facilities on the upstream side or the downstream side. For example, if the end of the pipe connected to the motor pump has a flange and the flange connects to the motor pump, the motor pump should also be provided with the same type of flange and fasteners (eg, bolts and nuts). Join both flanges with. As the flange, for example, a flange conforming to the JIS standard is used. In addition, it is necessary to provide a work space for accessing piping such as flanges and fasteners. Therefore, there is a problem that the installation space becomes uniformly large regardless of the size of the motor pump. In addition, the type of flange connected to the motor pump differs depending on the transport liquid, equipment, equipment, and the like. Therefore, in the following embodiment, a motor pump that realizes a compact installation space even with flange connection and can support 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 connecting 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 connecting portion 300 corresponds to the heat radiating member 20 according to the above-described embodiment. Therefore, the flange connecting portion 300 includes a cover plate 300a corresponding to the cover plate 20a and a fixing ring 300b corresponding to the fixing ring 20b. In the present embodiment, the motor casing 3, the cover plate 300a, the fixing ring 300b, and the suction port 15 are made of separate parts. However, in one embodiment, at least two of the motor casing 3, the cover plate 300a, the fixing ring 300b, and the suction port 15 may be integrally configured.

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

The flange member 310 is formed with a through hole 310a through which the fastener 311 penetrates. With the flange member 310 in contact with the flange facing surface 301 of the flange connecting portion 300, the fastener 311 is inserted into the through hole 310a and the screwed portion 302, and the fastener 311 is tightened to connect the flange member 310 to the flange. It is connected to the unit 300. The flange member 310 and the flange facing surface 301 may be connected via a sealing member (gasket, O-ring, etc.) (not shown).

As described above, since the motor pump includes the flange connecting portion 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 compact. Can be done. Further, in the present embodiment, the installation space of the motor pump can be made compact.

The flange connecting portion 300 is preferably detachable from the motor casing 3. More specifically, as shown in FIG. 15, the flange connecting portion 300 has a mounting portion 303 that can be mounted on the motor casing 3. The motor casing 3 has a shape corresponding to the mounting portion 303 of the flange connecting portion 300, and the flange connecting portion 300 can be mounted on the motor casing 3 via the mounting portion 303. In one embodiment, the mounting portion 303 has a screwed structure, and the flange connecting portion 300 is mounted on the motor casing 3 by screwing. In another embodiment, the mounting portion 303 has a fitting structure, and the flange connecting portion 300 is mounted on the motor casing 3 by fitting. Further, in another embodiment, the flange connecting portion 300 is attached to the motor casing 3 with fasteners (for example, bolts and nuts). In the motor pump of the present embodiment, since the flange connecting portion 300 can be attached to and detached from the motor casing 3, various types of flanges can be supported by changing the design of the flange connecting portion 300. Here, as a comparative example, a method of providing flanges at the suction port 15a and the discharge port 16b via a nipple will be given in order to correspond to different flanges. According to the method of the comparative example, the conveyed liquid may leak from the connection portion between the nipple and the flange. In the present embodiment, since the flange connecting portion 300 is mounted on the motor casing 3, it can be sealed in a wider area than in the comparative example, so that it is possible to prevent water leakage of the conveyed liquid.

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

The motor casing 3 has entrances 320A and 320B connected to the cooling flow path 65. The fluid having a temperature lower than that of the transport liquid is introduced into the cooling flow path 65 inside the motor casing 3 through either the entrance / exit 320A or 320B (in the embodiment shown in FIG. 15, the entrance / exit 320A). In the present embodiment, the doorway 320A is formed in the lower part of the motor casing 3, and the doorway 320B is formed in the upper part of the motor casing 3. However, regardless of this, the entrances 320A and 320B may be provided on the outer peripheral surface of the motor casing 3 and / and the flange connecting portion 300. For example, the motor casing 3 and / and the flange connection portion 300 may be formed on an extension of the axis CL, or both the entrances and exits 320A and 320B may be formed on the upper or lower portion of the motor casing 3 and / and the flange connection portion 300. ..

The fluid introduced into the cooling flow path 65 flows into the communication flow path 315 through the communication flow path 316, and the cooling flow path 65, the communication passage 316, and the communication flow path 315 are filled with the coolant. In this state, the coolant flows out from the entrance / exit 320B. As the cooling liquid flows through the cooling flow path 65 and the communication flow path 315 in this way, the motor stator 6 is cooled by the cooling liquid. If the motor stator 6 does not need to be cooled, the cooling flow path 65 and the communication flow path 315 may not be provided.

FIG. 16 is a diagram showing still another embodiment of the motor pump. 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 FIG. 16, the motor pump includes a flange connecting portion 330 in which a discharge port is formed. The flange connecting portion 330 has a flange facing surface 331 facing the flange member 310, and a screwed portion 332 to which the fastener 311 can be screwed.

In the above-described embodiment, 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 connecting portion 330, the fastener 311 is inserted into the through hole 310a and the screwed portion 332, and the fastener 311 is tightened. Thereby, the flange member 310 is connected to the flange connecting portion 330.

In the embodiment shown in FIG. 16, the flange connecting portion 330 is removable from the pump casing 2. More specifically, as shown in FIG. 16, the flange connecting portion 330 has a mounting portion 333 that can be mounted on the pump casing 2. The pump casing 2 has a shape corresponding to the mounting portion 333 of the flange connecting portion 330, and the flange connecting portion 330 can be mounted on the pump casing 2 via the mounting portion 333. In one embodiment, the mounting portion 333 may have a screwed structure, and in another embodiment, the mounting portion 333 may have a fitting structure, and the flange connecting portion 330 and the pump casing 2 may be provided. And may be fastened with some fastener. The mounting portion 303 shown in FIG. 15 is formed on the outer peripheral side of the flange connecting portion 300. Similarly, the mounting portion 333 may be formed on the outer peripheral side of the flange connecting portion 330, or the mounting portion 303 shown in FIG. 15 may be formed on the liquid flow path X side as in the mounting portion 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 connecting portion 300 shown in FIG. 15 and the flange connecting portion 330 shown in FIG. In such a configuration, the motor pump can be flanged to the upstream equipment and the downstream equipment. In addition, the motor pump can be installed compactly, and various connection methods and flanges can be easily supported.

FIG. 17 is a diagram showing still another embodiment of the motor pump. 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 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 flow path 315, and a communication passage 336 that communicates the cooling jacket 60 and the communication flow path 315. The cooling jacket 60 and the flange connecting portion 300 may be integrally configured.

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

The above-described embodiment is described for the purpose of enabling a person having ordinary knowledge in the technical field to which the present invention belongs to carry out the present 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 present invention is not limited to the described embodiments, but is construed in the broadest range according to the technical idea defined by the claims.

1 Impeller 2 Pump casing 3 Motor casing 3a Liquid flow path 3b Thread hole 3c Outer 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 15e Threaded 15f Circular groove 16 Discharge port 16a Discharge port 20 Heat dissipation member 20a Cover plate 20b Fixed ring 32 Side wall 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 Recessed 63 Heat dissipation member side surface (first surface)
65 First cooling flow path 66 Opposite surface (second surface)
67 Groove 68 Communication flow path 70 Second cooling flow path 75, 75A, 75B Reinforcing rib 100 Terminal box 100a Terminal box body 100b Lid 101 Fastener 102 Wiring port 103 Fastener 200 Cable lead-in port 300 Flange connection part 300a Cover plate 300b Fixed Ring 301 Flange facing surface 302 Screwing part 303 Mounting part 310 Flange member 310a Through hole 311 Fastener 315 Communication flow path 316 Communication passage 320A, 320B Doorway 330 Flange connection part 331 Flange facing surface 332 Screwing part 333 Mounting part

Claims (8)

An impeller with a permanent magnet embedded in it,
The pump casing that houses the impeller and
A motor stator with multiple stator coils and
A motor casing accommodating the motor stator and
A liquid flow path formed in the center of the motor casing and through which the conveyed liquid conveyed by the impeller passes.
A motor pump comprising a flange connection portion formed with a suction port or a discharge port of the liquid flow path. The flange connection is
A flange facing surface facing the flange member connected to the motor pump, and a flange facing surface.
The motor pump according to claim 1, further comprising a screwed portion formed on the flange facing surface and into which a fastener for fastening the motor pump and the flange member can be screwed. The motor pump according to claim 1 or 2, wherein the flange connecting portion is detachable from the pump casing or the motor casing. Any of claims 1 to 3, wherein 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 motor pump described in item 1. The motor pump according to claim 1 to 4, wherein the motor pump includes a cooling flow path formed in the motor casing through which a fluid having a temperature lower than that of the conveyed liquid flows. The motor pump according to claim 5, wherein the communication flow path formed in the flange connecting portion and the cooling flow path through which the cooling fluid flows in the motor casing communicate with each other. The motor pump includes a cooling jacket through which a cooling fluid having a temperature lower than that of the transport liquid flows.
The motor pump according to any one of claims 1 to 6, wherein the cooling jacket covers at least the outer peripheral surface of the motor casing. The motor pump according to claim 7, wherein the communication flow path formed in the flange connection portion and the cooling flow path of the cooling jacket through which the cooling fluid flows communicate with each other.

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