CN114649891A

CN114649891A - Motor with cooling circulation function, pump assembly and shell assembly for motor

Info

Publication number: CN114649891A
Application number: CN202011516517.8A
Authority: CN
Inventors: 朱世军; 肖铭慧; 陆先高
Original assignee: Wenling Zhengfeng Digital Electromechanical Technology Co ltd
Current assignee: Wenling Zhengfeng Digital Electromechanical Technology Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2022-06-21
Anticipated expiration: 2040-12-21
Also published as: CN114649891B

Abstract

The application provides a motor with cooling cycle function, includes: the motor comprises a motor shaft, a stator, a shield, a shell and an outer seal, wherein the outer seal and the shell are configured to separate an inner space of the motor from an external environment; the motor shaft includes: a first passage located inside thereof, and a first through hole and a second through hole provided on a wall of the motor shaft and axially spaced from each other, the second passage being formed between the outer seal and the housing, the housing including: third and fourth through holes disposed in a wall of the housing and axially spaced from one another, the first and second passages establishing fluid communication therebetween through the first and second through holes and the third and fourth through holes. The present application further provides a pump assembly including an electric motor having a cooling cycle function. The present application further provides a housing assembly.

Description

Motor with cooling circulation function, pump assembly and shell assembly for motor

Technical Field

The present disclosure relates to a motor, and more particularly, to a motor having a cooling cycle function; in addition, the invention also relates to a pump assembly comprising the motor with the cooling circulation function, for example, a deep well pump assembly comprising a multi-stage pump unit.

Background

Pump assemblies, such as deep well pump assemblies, generally include two main parts: at least one pump for pumping a working medium (typically a fluid, such as water) or the like from one location to another; and a motor to power the pump assembly.

During operation, on the one hand, the motor generates a large amount of heat. The excessive high temperature can greatly shorten the service life of the motor and even can cause sudden combustion damage in certain use; on the other hand, the motor plain bearing generates a certain amount of heat in the case of continuous operation, which affects the service life of the plain bearing, and therefore such heat is also desirably avoided.

If, for example, the motor slide bearing is damaged, a new motor needs to be replaced. However, replacing the motor (and the entire pump assembly if the motor and pump are integrally mounted) requires a significant amount of manpower and material resources, which greatly increases the cost of using the pump assembly.

At least in view of the above, it is necessary to install cooling means in the motor to cool the motor as a whole and/or the motor sliding bearings in operation.

However, the cooling devices disclosed in the prior art in connection with electric motors are complex in design and cumbersome in construction, which is burdensome for the pump assembly, especially for miniaturized deep well pump assemblies, on the one hand increasing the difficulty and economic cost of installation and construction, and on the other hand often causing failures, resulting in a lot of inconvenience.

In addition, the problem of lubrication of motor sliding bearings has not been thoroughly solved, and it is desirable to design a motor structure to at least further solve the problem.

Additionally, in environments where electric motors are used (e.g., with deep well pump assemblies that include the electric motor), the working medium and/or the fluid in the external environment (typically a medium such as water) often contains impurities, such as sand. If such contaminants enter the motor for a variety of reasons, they can cause damage to the motor and reduce the life of the motor (and the deep well pump assembly). This situation is also desirably avoided.

In view of, but not limited to, the above problems, it would be desirable to provide a motor that is simple in structure and reliable in operation, and more particularly to a motor having a cooling cycle function, and a pump assembly including such a motor having a cooling cycle function, for example, a deep well pump assembly including a multi-stage pump unit, to at least partially address at least one of the above problems.

Disclosure of Invention

The present application aims to provide an electric machine with a cooling circulation function, which is advantageous in at least one respect with respect to the prior art.

To this end, the present application provides, in one aspect, an electric machine having a cooling cycle function, including: a motor shaft having an axis extending in a vertical direction; a stator arranged at a distance from and surrounding the motor shaft; a shield disposed between the motor shaft and the stator to prevent fluid communication between the motor shaft and the stator; a housing having a length extending in an axial direction and defining an inner space of the motor; and an outer seal connected to the housing at an outer side of the housing, wherein the outer seal and the housing together are configured to isolate an interior space of the electric machine from an external environment; wherein, the motor shaft includes: a first passage located inside thereof, and a first through hole and a second through hole provided on a wall of the motor shaft and axially spaced from each other, and wherein a second passage is formed between the outer seal and the housing, and wherein the housing includes: a third through-hole and a fourth through-hole disposed on a wall of the housing and axially spaced from each other, and wherein fluid communication is established between the first and second passages through the first and second through-holes and the third and fourth through-holes.

Optionally, the housing is a housing assembly, further comprising: a body kit extending around an axis of the motor shaft at a distance and covering the stator; a top cover located at the upper part of the motor shaft and closely fitted to the body kit; and a bottom cover fixed at a bottom end of the motor shaft and closely fitted to the body kit.

Optionally, one of the third and fourth through holes is positioned on the top cover, and wherein the other of the third and fourth through holes is positioned on the bottom cover.

Optionally, one of the first through hole and the second through hole is positioned at or near a bottom of the motor shaft, and wherein the other of the first through hole and the second through hole is positioned at an upper portion of the motor shaft and near an upper surface of the top cover.

Optionally, at least one of the top cover and the bottom cover is configured as a removable component.

Optionally, the motor having a cooling cycle function further includes: at least one thermostat provided in a flow path of the fluid to detect an internal temperature of the motor and/or a cooling efficiency.

Optionally, the motor having a cooling cycle function further includes: one or more auxiliary processors for drawing fluid from the external environment and filtering impurities in the fluid for supply to the interior of the motor as a fluid for the cooling cycle.

Optionally, the motor shaft further comprises a sixth through hole provided on a wall of a portion of the motor shaft extending out of the housing.

The present application provides, in another aspect, a pump assembly, for example, a deep well pump assembly including a multi-stage pump unit, including such a motor with a cooling cycle function. Such a pump assembly comprises: at least one pump unit; and an electric motor having a cooling cycle function, the electric motor being coupled to the at least one pump unit.

The present application provides, in yet another aspect, a housing assembly having a cooling cycle function. This kind of a housing assembly for a motor includes: a housing having a length extending in an axial direction; and an outer seal connected to the housing at an outer side of the housing, wherein the outer seal and the housing together are configured to define an interior space of the electric machine and to isolate the interior space of the electric machine from an external environment;

and wherein a channel is formed between the outer seal and the housing, and wherein the housing comprises: at least two through holes provided in a wall of the housing and axially spaced from each other, and wherein the channel is in fluid communication with the motor interior space through the at least two.

The motor with the cooling circulation function according to the present application has at least the following advantages: the structure is simple and the operation is reliable; the weight of the motor is reduced, and the structure of the motor is simplified; the separate provision of an additional dedicated cooling fluid is dispensed with. Meanwhile, the lubricating function can be provided for the motor, particularly for a sliding bearing of the motor. Besides, the cooling process can prevent the motor from being damaged by impurities possibly carried by the fluid existing in the external environment. In the present application, water may be used not only as a lubricating medium but also as a cooling medium. In addition, food-grade antifreezing media can be added into the water to lubricate and cool the sliding bearing, and the mode also has the advantage of not polluting water sources and environment.

Therefore, the motor with the cooling circulation function disclosed by the application not only reduces the manufacturing cost and the installation cost; in addition, the energy can be saved, the electric energy required to be consumed by the motor equipment is reduced, and the use cost is reduced.

Drawings

Fig. 1 illustrates an electric machine having a cooling cycle function according to an embodiment of the present application.

Detailed Description

Some possible embodiments of the present application are described below with reference to the drawings. It should be noted that the figures are not drawn to scale. Some details may be exaggerated for clarity and some details not necessarily shown may be omitted.

The description of the directions in this application is described with reference to what is shown in the drawings, for purposes of illustration only and is not intended to be limiting in any sense.

In addition, it should be noted that the various features disclosed in this application may be combined in any suitable manner and order and still fall within the scope of the disclosure.

Fig. 1 illustrates a motor having a cooling cycle function according to an embodiment of the present application. As shown in fig. 1, the motor includes: the rotor, here shown as motor shaft 1, stator 2, shield 3 spacing motor shaft 1 and stator 2 apart, the housing assembly, and outer seal 7. The housing assembly and the outer seal 7 together serve to isolate the motor shaft 1, the stator 2, and the shield 3 from the environment. The housing assembly includes: a fuselage assembly 4, a top cover 5 and a bottom cover 6.

The outer seal 7 is connected to the housing assembly at the outer side of the housing assembly.

In the orientation shown in fig. 1, the motor shaft 1 extends in the vertical direction, and the stators 2 are distributed annularly around the motor shaft 1 with a gap around the motor shaft 1. In the gap between the motor shaft 1 and the stator 2, a shield 3 is provided, said shield 3 being configured to be able to prevent fluid communication between the motor shaft 1 and the stator 2, at least to prevent liquid (e.g. water) communication between the motor shaft 1 and the stator 2.

The stator 2 is externally covered with a body kit 4. The body kit 4 surrounds the stator 2 in the axial direction and extends in the vertical direction for a certain length to cover at least a part of the motor shaft.

The bottom cover 6 is fixed on the bottom end of the motor shaft 1 and is tightly fitted to the body kit 4. The top cover 5 is centrally provided with a central through hole 51 configured such that the upper end of the motor shaft 1, which may be coupled to at least one pump unit (not shown), can extend from the interior of the motor through the central through hole 51. The roof 5 is a close fit to the fuselage assembly 4.

As shown in fig. 1, the motor shaft 1 includes a first passage 21 therein. The motor shaft further includes a motor shaft bottom through hole 22 (one of the first through hole and the second through hole) provided on the bottom thereof. The motor shaft bottom through hole 22 is configured to fluidly communicate the first passage 21 with the motor interior.

The side wall of the bottom cover 6 is also provided with a bottom cover side wall through hole 61 (one of the third through hole and the fourth through hole). The outer seal 7 is connected to the housing assembly at the outer side of the housing assembly such that a second channel 71 is formed between the outer seal 7 and the housing assembly. The second channel 71 is not in fluid communication with the external environment; alternatively, the outer seal 7 prevents fluid communication between the outside fluid and the interior of the motor.

The bottom cover side wall through hole 61 is configured to enable fluid communication between the motor interior defined by the bottom cover 6 and the second channel 71.

In addition, the motor shaft 1 further includes a motor shaft upper through hole 23 (the other of the first through hole and the second through hole) located at an upper portion of the motor shaft. The motor shaft upper through hole 23 is configured to enable fluid communication between the inside of the top cover 5 and the first passage 21.

A top cover sidewall through hole 52 (one of the third through hole and the fourth through hole) is also formed in the sidewall of the top cover 5. The top cover sidewall through-hole 52 is configured to enable fluid communication between the motor interior and the second channel 71.

In one embodiment, as shown in fig. 1, the shield 3 includes a cavity 31 in its interior. The cavity 31 is not in fluid communication with the stator 2. In this case, it is also possible to provide an additional through hole on the motor shaft, for example the motor shaft central through hole 24 (fifth through hole), so that the first channel 21 of the motor shaft and the cavity 31 are in fluid communication.

During operation of the electric motor, typically as part of a pump assembly, includes fluid therein to be circulated for cooling. The fluid may be distributed, for example, in the first passage 21, the second passage 71, and other motor internal spaces.

The fluid may be water, for example. The fluid may be injected into the motor for a cooling cycle by, for example, a professional operator prior to use (e.g., prior to placing the motor into the well along with the deep-well pump) or by the manufacturing party when manufacturing the motor.

When the motor is energized, the motor shaft 1 rotates to rotate the pump unit above the motor to deliver fluid at the bottom inside the motor to a higher location. In this process, the fluid in the second passage 71 enters the inside of the bottom cover through the bottom cover side wall through hole 61 in the bottom cover 6, and is then sucked into the first passage 21 of the motor shaft 1 via the motor shaft bottom through hole 22 in the bottom of the motor shaft 1, flows upward along the first passage 21 of the motor shaft 1, and flows into the inside of the top cover 5 through the motor shaft upper through hole 23 in the upper part of the motor shaft, and then flows back to the second passage 71 again through the top cover side wall through hole 52 of the top cover 5.

The motor skillfully utilizes the pressure difference (power) generated by the motor during the operation process to cool the motor, in particular to a sliding bearing of the motor. In this way, it is possible to dispense with the separate provision of one or more power elements for driving the cooling fluid, which simplifies the construction of the electric machine, saves energy and, in addition, provides lubrication for the electric machine, in particular for the plain bearings of the electric machine. Further reducing the volume and weight of the motor and reducing the manufacturing cost and the installation cost.

In addition, the hollow design of the motor shaft further reduces the weight of the motor.

In one embodiment, where the shield 3 has a cavity 31 as described above and the motor 2 has a motor shaft center through hole 24 as described above, fluid flowing up the first passage 21 of the motor shaft 1 may also flow into the cavity 31 of the shield 3 through the motor shaft center through hole 24.

In this way, the contact area between the fluid and the interior of the motor is increased, and the cooling effect on the motor is further enhanced.

In one embodiment, the motor may include a plurality of motor shaft central through holes 24. Alternatively, the plurality of motor shaft center through holes 24 may be evenly distributed along the circumference of the motor shaft, including but not limited to being equidistantly distributed.

Additionally or alternatively, the motor shaft bottom through hole 22 may be located on the side wall of the motor shaft near the bottom. In one embodiment, the motor may include a plurality of motor shaft bottom through holes 22 on a sidewall of the motor shaft near the bottom. Alternatively, the plurality of motor shaft bottom through holes 22 may be evenly distributed along the circumference of the motor shaft, including but not limited to being equidistantly distributed.

In one embodiment, the motor may include a plurality of motor shaft upper through holes 23. Alternatively, the plurality of motor shaft upper through holes 23 may be evenly distributed along the circumference of the motor shaft, including but not limited to being equidistantly distributed.

Alternatively or additionally, the bottom cover 6 may include a bottom cover bottom wall through hole (not shown) on an end face of the bottom cover. In the case of a bottom cover bottom wall through hole, the bottom cover side wall through hole 61 may be omitted.

In one embodiment, at least one of the first through hole, the second through hole, the third through hole and the fourth through hole on the motor shaft has an opening area different from an opening area of other through holes except the at least one of the first through hole, the second through hole, the third through hole and the fourth through hole.

Additionally or alternatively, the first channel 21 may extend in the axial direction up into the part of the motor shaft that protrudes outside the housing. In this way, it is possible to further extend the time during which the fluid flows within the electric machine and/or to increase the volume of cooling fluid that can be circulated within the electric machine to further enhance the cooling efficiency.

In the case where the first passage 21 extends upward in the axial direction into the portion of the motor shaft extending outside the housing, preferably, the motor shaft 1 may further include a sixth through hole (not shown) provided on a wall of the portion of the motor shaft extending outside the housing assembly. In this way, the flow rate of the fluid circulation can be enhanced to further enhance the cooling efficiency.

In one embodiment, the housing assembly may be integrated into a unitary structure. In other words, the fuselage airframe assembly 4, the top cover 5 and the bottom cover 6 may be integrally formed as a one-piece housing.

In one embodiment, the material forming at least one of the top cover 5 and the bottom cover 6 comprises aluminum, such as an aluminum alloy. In one embodiment, the material forming at least one of the airframe assembly 4 and the motor shaft 1 includes steel.

Alternatively, in one embodiment, the opening area of at least one of the through-holes described above is equal everywhere, as viewed in the direction of fluid flow (perpendicular to the axis of the motor shaft).

In another embodiment, the opening area of at least one of the through holes described above is gradually reduced, as seen in the direction of fluid flow. For example, for the bottom cover side wall through hole 61 located on the wall of the housing, its opening area on the outer wall (toward the second channel 71) is largest, and then gradually decreases in the direction of fluid flow (from the second channel 71 to the first channel 21), and its opening area on the inner wall (toward the first channel 21) is smallest. Also for example, alternatively, for the top cover side wall through hole 52, the opening area thereof on the inner wall (toward the first passage 21) is the largest, and then gradually decreases in the direction of fluid flow (from the first passage 21 to the second passage 71), and the opening area thereof on the outer wall (toward the second passage 71) is the largest.

Of course, an embodiment is also conceivable in which the opening area of at least one of the above-described through-holes gradually increases, as seen in the direction of fluid flow. With reference to the foregoing, specific details of the through-holes, such as the bottom cover sidewall through-hole 61, and the top cover sidewall through-hole 52, can also be derived. And therefore will not be described in detail herein.

The above is exemplified by the through hole being located on the housing. Of course, the same kind of design can also be applied to at least one through hole provided in the motor shaft, such as the motor shaft bottom through hole 22, the motor shaft upper through hole 23 or the motor shaft middle through hole 24. And therefore will not be described in detail herein.

In one embodiment, at least one of the top cover 5 and the bottom cover 6 may be configured as a removable component. The at least one of the top cover 5 and the bottom cover 6 may be made of a lightweight material, such as plastic.

Alternatively, a suitable number of through holes may be provided in the at least one of the top cover 5 and the bottom cover 6. Optionally, at least one of the through holes may be configured to be opened or closed by manual or automatic means. In this way, the opening or closing of the at least one of the through holes can be set accordingly, depending on the situation (e.g. length of time and/or amount of power) in which the motor is operating.

In one embodiment, the motor further comprises at least one thermostat disposed therein. The at least one thermostat is disposed in a flow path of the fluid. In this way, the internal temperature and/or cooling efficiency of the motor can be detected.

In one embodiment, the motor may further comprise one or more auxiliary processors, for example comprising a filtration device. The filter device can, for example, suck in fluid from the environment and filter impurities in the fluid for supply to the interior of the electric machine as cooling circulation liquid.

The auxiliary processor may, for example, further comprise a drain. The discharge device may discharge the cooling circulation liquid inside the motor out of the motor.

The one or more auxiliary processors may be mounted in any suitable location, for example external or internal to the motor. In one embodiment, the motor disclosed herein may also be included in or associated with an auxiliary processor.

In one embodiment, the electric machine may further comprise one or more other types of cooling devices than those disclosed in the present disclosure.

In one embodiment, the motor shaft 1 may be provided with a suction device to further enhance the flow of fluid from below upwards along the first channel 21 and/or from above downwards along the second channel 71.

In one embodiment, the wall of the first passage 21 of the motor shaft 1 may be provided with a pattern configured such that the resistance to fluid flow in the top-to-bottom direction is greater than the resistance to fluid flow in the bottom-to-top direction.

In one embodiment, the shield 3 may further comprise a seventh through hole (not shown in the figures) configured to fluidly communicate the cavity 31 with the interior of the motor in fluid communication with the first channel 21 and the second channel 71.

In one embodiment, the stator includes a plurality of stator units arranged spaced apart from each other around the motor shaft 1. The shield 3 has a plurality of ribs distributed radially. The plurality of ribs are respectively interposed between adjacent two stator units. Each rib comprises a cavity 31. By this arrangement the contact area of the motor and the fluid and the volume and/or residence time of the fluid within the motor are further increased, optimizing the cooling efficiency.

In one embodiment, at least a portion of the shield may be made of a flexible material. In one embodiment, the material from which the shield (or at least one rib of the shield, as described above, in the case where the shield includes a plurality of ribs) is constructed is a good conductor of heat.

Similarly, the constituent material of at least one of the housing (e.g., the outer wall of the housing) and the motor shaft 1 is a good conductor of heat. In the case where the case is a case assembly including the top cover 5, the bottom cover 6, and the body kit 4, the constituent material of at least one of the top cover 5, the bottom cover 6, and the body kit 4 is a good conductor of heat.

In one embodiment, the motor may be battery powered.

In one embodiment, the motor may be powered by the power supply grid, for example by a cable.

In the present application, the motor is described in the context of a pump assembly. However, the electric machine disclosed herein is not limited to use in a pump assembly or a deep well pump assembly, but may be used in any suitable, compatible setting, including but not limited to a vehicle and/or laboratory environment.

Although the present application has been described herein with reference to particular embodiments, the scope of the present application is not intended to be limited to the details shown. Various modifications may be made to these details without departing from the underlying principles of the application.

Claims

1. An electric machine having a cooling cycle function, comprising:

a motor shaft (1) having an axis extending in a vertical direction;

a stator (2) arranged at a distance from the motor shaft (1) and surrounding the motor shaft (1);

a shield (3) arranged between the motor shaft (1) and the stator (2) to prevent fluid communication between the motor shaft (1) and the stator (2);

a housing having a length extending in an axial direction and defining an inner space of the motor; and

an outer seal (7) connected to the housing at an outer side of the housing, wherein the outer seal (7) and the housing together are configured to separate an inner space of the electrical machine from an external environment;

wherein the motor shaft (1) comprises:

a first passage (21) located therein, and

a first and a second through hole (22, 23) arranged on the wall of the motor shaft (1) and axially spaced from each other,

and wherein a second channel (71) is formed between the outer seal (7) and the housing,

and wherein the housing comprises:

third and fourth through holes (52, 61) provided on the wall of the housing and axially spaced from each other,

and wherein fluid communication is established between the first and second channels (21, 71) by the first and second through holes (22, 23) and the third and fourth through holes (52, 61).

2. The motor having a cooling cycle function of claim 1, wherein the housing is a housing assembly, further comprising:

a body kit (4) extending at a distance around the axis of the motor shaft (1) and covering the stator (2);

a top cover (5) which is positioned at the upper part of the motor shaft (1) and is tightly matched to the machine body suite (4); and

and the bottom cover (6) is fixed at the bottom end of the motor shaft (1) and is tightly matched with the machine body suite (4).

3. The motor having a cooling cycle function according to claim 2, wherein one of the third and fourth through holes (52, 61) is positioned on the top cover (5), and wherein the other of the third and fourth through holes (52, 61) is positioned on the bottom cover (6).

4. The motor with a cooling cycle function as claimed in claim 2, wherein one of the first and second through holes (22, 23) is positioned at or near a bottom end of the motor shaft (1), and wherein the other of the first and second through holes (22, 23) is positioned at an upper portion of the motor shaft (1) and near an upper surface of the top cover (5).

5. The motor having a cooling cycle function according to any one of claims 1 to 4, wherein at least one of the top cover (5) and the bottom cover (6) is configured as a removable member.

6. The motor having a cooling cycle function according to any one of claims 1 to 4, further comprising: at least one thermostat provided in a flow path of the fluid to detect an internal temperature of the motor and/or a cooling efficiency.

7. The motor having a cooling cycle function according to any one of claims 1 to 4, further comprising: one or more auxiliary processors for drawing fluid from the external environment and filtering impurities in the fluid for supply to the interior of the motor as a fluid for the cooling cycle.

8. The motor with a cooling cycle function as claimed in any one of claims 1 to 4, wherein the motor shaft (1) further includes a sixth through hole provided on a wall of a portion of the motor shaft (1) extending out of the housing.

9. A pump assembly, comprising:

at least one pump unit; and

the cooling cycle functional electric motor according to any one of claims 1 to 8, which is coupled to the at least one pump unit.

10. A housing assembly for an electric machine comprising:

a housing having a length extending in an axial direction; and

an outer seal (7) connected to the housing at an outer side of the housing, wherein the outer seal (7) and the housing together are configured to define an interior space of the electric machine and to isolate the interior space of the electric machine from an external environment;

and wherein a channel (71) is formed between the outer seal (7) and the housing,

and wherein the housing comprises:

at least two through holes (52, 61) arranged on the wall of the housing and axially spaced from each other,

and wherein said channel (71) is in fluid communication with the motor interior space via said at least two (52, 61).