Housing having cooling performance, motor, and compressor

Abstract

The present application provides a housing having cooling performance, a motor, and a compressor. A cooling water flow channel is arranged between the inner wall and the outer wall of the housing. The cooling water flow channel comprises a first circumferential water flow channel, a first connection water flow channel, and a second circumferential water flow channel. In a water flow direction, the first circumferential water flow channel extends in a first circumferential direction of the housing, and the second circumferential water flow channel extends in a second circumferential direction of the housing, wherein the first circumferential direction is opposite to the second circumferential direction. The first circumferential water flow channel and the second circumferential water flow channel are located at different positions in the axial direction of the housing. The first circumferential water flow channel, the first connection water flow channel, and the second circumferential water flow channel are sequentially communicated to form a water passage allowing for water flow. In the present application, the circumferentially reciprocating and axially staggered water flow channel can be formed, which increases the contact area between cooling water and the housing, thereby improving the cooling efficiency of the motor.

Description

Casing, motor and compressor with cooling performance

[0001] The present application claims priority to the Chinese patent application No. 2024113498659, filed on September 26, 2024, and entitled "Casing, motor and compressor with cooling performance", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric machines, in particular to a casing, motor and compressor with cooling performance. BACKGROUND

[0003] Gas dynamic pressure bearing has the advantages of high precision, no pollution, high speed and simple structure, and has been widely used in high-speed rotating machines such as oil-free turbines of aero-engines, cryogenic expanders and air cycle machines of aircraft.

[0004] High-speed motors have high heat density, and insufficient cooling will lead to reduced reliability of the motor, and in severe cases, will cause rotor demagnetization, shaft rubbing, motor insulation failure and other adverse problems. Therefore, it is necessary to study new cooling structures for high-speed motors.

[0005] In the prior art, there is a casing assembly of a two-stage air-suspended centrifugal electric direct-drive air compressor, a cooling water flow channel and a cooling gas flow channel are arranged in the casing wall, cooling water joints and cooling gas joints penetrate the casing and lead to the inner cavity of the casing, realizing double-layer cooling of the casing and the motor inside, but the gas channel is arranged below the water channel, resulting in a larger casing wall thickness, increasing the overall machine mass and volume.

[0006] In the prior art, there is a cooling system of a two-stage air-suspended centrifugal permanent magnet motor direct-drive air compressor, which is provided with an air cooling device and a liquid cooling device, the air cooling joint is communicated with the inner cavity of the casing, realizing cooling of the motor casing and internal components, and this patent mainly describes the arrangement of the cooling gas flow channel in the cavity, lacking the design of the water channel and the gas channel.

[0007] In the overall water and air cooling structure of the existing embodiments, the motor cavity gas flow channel is carefully described, while the cooling water flow channel is ignored, the casing thickness is increased or the water channel area is reduced to meet the air cooling flow channel design, resulting in a decrease in overall cooling efficiency, which is a technical problem that needs to be solved by those skilled in the art.

[0008] Since the motor in the prior art has the technical problems of high temperature rise during operation and insufficient heat dissipation performance, the present application designs a casing, motor and compressor with cooling performance.

[0009] Practical new type content

[0010] Therefore, the technical problem to be solved by the present application is to overcome the defects of high temperature rise and poor heat dissipation performance of the motor in the prior art, so as to provide a casing, a motor and a compressor with high cooling performance.

[0011] To solve the above problems, the present application provides a casing with cooling performance, wherein:

[0012] The inner wall and the outer wall of the casing are provided with a cooling water flow channel, the cooling water flow channel comprises a first circumferential water flow channel, a first connecting water flow channel and a second circumferential water flow channel, the first circumferential water flow channel extends along a first circumferential direction of the casing in the direction of water flow, the second circumferential water flow channel extends along a second circumferential direction of the casing in the direction of water flow, the first circumferential direction and the second circumferential direction are opposite in the projection plane of the axial end surface of the casing, and the first circumferential water flow channel and the second circumferential water flow channel are located at different positions in the axial direction of the casing, one end of the first connecting water flow channel is in communication with one end of the first circumferential water flow channel, and the other end of the first connecting water flow channel is in communication with one end of the second circumferential water flow channel, so that the first circumferential water flow channel, the first connecting water flow channel and the second circumferential water flow channel are sequentially communicated to form a water passage allowing water flow.

[0013] In some embodiments,

[0014] The first circumferential water flow channel, the first connecting water flow channel and the second circumferential water flow channel form a group of water flow channel units, and there are at least two groups of water flow channel units, and the at least two groups of water flow channel units are arranged along the axial direction of the casing, and the adjacent two groups of water flow channel units are communicated through the second connecting water flow channel.

[0015] In some embodiments,

[0016] The distribution angle range of the first circumferential water flow channel in the circumferential direction of the casing is greater than 180° and less than 360°, so that the first circumferential water flow channel forms a non-continuous part in the circumferential direction, the distribution angle range of the second circumferential water flow channel in the circumferential direction of the casing is greater than 180° and less than 360°, so that the second circumferential water flow channel forms a non-continuous part in the circumferential direction, and the non-continuous part formed by the first circumferential water flow channel and the non-continuous part formed by the second circumferential water flow channel at least partially overlap in the projection plane of the axial end surface of the casing, forming the non-continuous part of the cooling water flow channel in the circumferential direction.

[0017] In some embodiments,

[0018] The distribution angle range of the first circumferential water flow channel in the circumferential direction of the shell is 300°-350°, and the distribution angle range of the second circumferential water flow channel in the circumferential direction of the shell is 300°-350°; the cross section of the cooling water flow channel is rectangular structure, the rectangle includes adjacent first side and second side, wherein the length of the first side is a, the length of the second side is b, and a / b=0.5-1.

[0019] In some embodiments,

[0020] In the projection plane of the axial end surface of the shell, the first circumferential water flow channel is in arc structure, and the arc range of the first circumferential water flow channel is greater than 180° and less than 360°, and the second circumferential water flow channel is in arc structure, and the arc range of the second circumferential water flow channel is greater than 180° and less than 360°.

[0021] In some embodiments,

[0022] The shell is cylindrical structure, has a central axis, the center of the first circumferential water flow channel is located on the central axis of the shell, and the center of the second circumferential water flow channel is also located on the central axis of the shell; and / or,

[0023] In the projection plane of the plane passing through the central axis of the shell, the first circumferential water flow channel is straight channel structure, the second circumferential water flow channel is also straight channel structure, the first connecting water flow channel is U-shaped pipe flow channel, and the second connecting water flow channel is also U-shaped pipe flow channel.

[0024] In some embodiments,

[0025] The shell is further provided with a water cooling inlet and a water cooling outlet, one end of the water flow channel unit at one axial end is communicated with the water cooling inlet, and one end of the water flow channel unit at the other axial end is communicated with the water cooling outlet.

[0026] In some embodiments,

[0027] The water cooling inlet is arranged on the outer wall of the uppermost end of the shell, the water cooling outlet is arranged opposite to the water cooling inlet in the axial direction of the shell, the axial distance between the water cooling inlet and the axial one end surface of the shell is less than a first preset distance, and the axial distance between the water cooling outlet and the axial other end surface of the shell is less than a second preset distance.

[0028] In some embodiments,

[0029] The inner wall and the outer wall of the casing are further provided with a cooling air flow channel, the cooling air flow channel is not communicated with the cooling water flow channel, and in the projection plane of the axial end surface of the casing, the cooling air flow channel and the cooling water flow channel do not overlap, forming a structure in which the cooling air flow channel and the cooling water flow channel are staggered in the circumferential direction.

[0030] In some embodiments,

[0031] When the cooling water flow channel has a circumferential direction non-connection part, the cooling air flow channel is arranged at the position of the circumferential direction non-connection part of the cooling water flow channel.

[0032] In some embodiments,

[0033] The cooling air flow channel includes a first air channel and a second air channel arranged in the radial direction of the casing, the first air channel extends in the axial direction of the casing, the second air channel also extends in the axial direction of the casing, and the first air channel and the second air channel are communicated through a communication air channel.

[0034] In some embodiments,

[0035] The outer wall of the casing is provided with an air cooling inlet, the air cooling inlet is communicated with one end of the first air channel, the first air channel extends in the axial direction and is communicated with the axial end of the second air channel through the communication air channel, the axial end of the casing is provided with a first air guide through hole, the first air guide through hole is communicated with the axial end of the second air channel, so that the gas can be introduced into the axial end of the casing, and the axial end of the casing is provided with a second air guide through hole, the second air guide through hole is communicated with the axial end of the second air channel, so that the gas can be introduced into the axial end of the casing.

[0036] In some embodiments,

[0037] The cooling water flow channel further includes a water cooling inlet, a second connecting water flow channel and a water cooling outlet;

[0038] The cooling water enters the first circumferential water flow channel inside the casing from the water cooling inlet, enters the first connecting water flow channel around the casing in a first rotation direction, flows from the first connecting water flow channel to the second circumferential water flow channel, enters the second connecting water flow channel around the casing in a second rotation direction, and flows out of the casing from the water cooling outlet along the circumferential reciprocating axial water channel, and the first rotation direction is opposite to the second rotation direction.

[0039] In some embodiments,

[0040] The water cooling outlet is arranged in the same axial direction of the water cooling inlet.

[0041] In some embodiments,

[0042] The cooling gas flow channel further comprises a compressed gas outlet, a gas cooling inlet, a cooling gas flow channel, a first gas guide through hole, a second gas guide through hole and a gas cooling outlet, wherein the high pressure gas is cooled in the casing through the pipeline from the gas cooling inlet, and the cooled high pressure gas is divided into two parts at the first gas guide through hole, one part of the cooled high pressure gas flows through the first gas guide through hole into the primary side to cool the front and rear axial bearings of the axial rotating system, and the other part of the cooled high pressure gas flows through the cooling gas flow channel and the second gas guide through hole of the casing into the secondary side to cool the end cover and the radial bearing of the secondary side.

[0043] The application further provides an electric machine comprising the casing with cooling performance.

[0044] In some embodiments,

[0045] When the water cooling inlet and the water cooling outlet are further arranged on the casing, the electric machine further comprises a stator, and the water cooling inlet is arranged opposite to the outgoing line side of the stator in the radial direction of the casing.

[0046] In some embodiments,

[0047] The electric machine comprises a stator and a high speed rotor, and a primary radial bearing seat and a secondary radial bearing seat supporting the high speed rotor, the primary radial bearing seat and the secondary radial bearing seat are respectively built-in installed at two ends of the casing, and a primary radial bearing and a secondary radial bearing are respectively installed on the primary radial bearing seat and the secondary radial bearing seat; the electric machine further comprises a primary diffuser and a secondary diffuser installed on the left and right outer sides of the casing, and a front axial bearing and a rear axial bearing are respectively installed on the primary diffuser and the primary radial bearing seat; the left and right ends of the high speed rotor respectively pass through the primary radial bearing seat and the primary diffuser, the secondary radial bearing seat and the secondary diffuser in sequence, and a primary impeller and a secondary impeller are respectively installed, an interference fitted thrust disc is arranged on the high speed rotor, and the thrust disc is arranged between the front axial bearing and the rear axial bearing; a primary volute and a secondary volute are respectively installed on the outer sides of the primary impeller and the secondary impeller, the primary volute and the secondary volute are connected through a connecting pipe, and a compressed gas outlet and a gas cooling inlet are arranged on the connecting pipe to be cooled in the casing and then introduced into the electric machine cavity.

[0048] In some embodiments,

[0049] The motor is provided with a cooling water flow channel above the motor.

[0050] The application also provides a compressor comprising the motor.

[0051] The motor and the compressor with the cooling performance have the following beneficial effects:

[0052] 1. The application sets the cooling water flow channel between the inner wall and the outer wall of the casing, and the cooling water flow channel comprises a first circumferential water flow channel, a first connecting water flow channel and a second circumferential water flow channel, the first circumferential water flow channel extends along a first circumferential direction, the second circumferential water flow channel extends along a second circumferential direction opposite to the first circumferential direction, and the first and second circumferential water flow channels are located at different positions in the axial direction, so that the cooling water flow channel is formed as a circumferential back-and-forth reciprocating and axial overlapping water flow channel, the water in the first circumferential water flow channel cools and dissipates heat inside the casing along the first circumferential direction, then travels to the second circumferential water flow channel along the axial direction, and cools and dissipates heat inside the casing along the second circumferential direction, greatly increasing the contact area of the cooling water with the casing, improving the heat exchange efficiency between the casing and the internal components of the casing, improving the cooling efficiency of the motor, and avoiding the situation that the motor runs with excessively high temperature rise, resulting in reduced heat dissipation performance.

[0053] 2. The circumferential back-and-forth reciprocating and axial overlapping cooling water flow channel forms a non-continuous part in the circumferential direction, and the cooling air flow channel is arranged on the casing at the position of the non-continuous part of the cooling water flow channel, so that the water flow channel and the air flow channel do not overlap in the circumferential direction of the casing, while increasing the contact and heat dissipation area of the cooling water with the casing through the cooling water flow channel, the purpose and effect of the cooling air flow channel for ventilating and dissipating heat inside the casing are also ensured, and the thickness of the casing is greatly reduced compared with the thickness of the water-air mixed cooling casing of the prior art, while the cooling and heat dissipation performance is improved.

[0054] The circumferential back-and-forth reciprocating and axial overlapping cooling water flow channel of the application is staggered with the cooling air flow channel in the circumferential direction of the casing, compared with the traditional spiral water flow channel, the cooling water flow channel and the casing are almost fully contacted in the axial and circumferential directions, the heat exchange between the stator in the casing and the cooling water is uniform, the problem that the local area of the stator and the glue-filled wire package has low heat exchange efficiency due to being far away from the water flow channel, resulting in high temperature rise and abnormal failure of the motor, is avoided, and the reliability and service life of the whole machine are improved.

[0055] 3. The application further enables the formation of radially bidirectional axial cooling air flow channels at the circumferential intervals of the casing water channel by setting the cooling air flow channels as first and second air channels spaced in the radial direction, so that the gas enters the casing, is cooled by the water channel and then enters the motor cavity to cool the key components such as the stator, rotor and bearing, further improving the cooling and heat dissipation effect of the motor interior. The multiple radially arranged gas cooling flow channels reduce the arrangement space of the cooling air flow channels in the circumferential direction of the casing, increase the heat exchange area of the high-pressure gas and the casing cooling water, improve the gas cooling efficiency, and further improve the cooling and heat dissipation effect of the motor interior. BRIEF DESCRIPTION OF DRAWINGS

[0056] Fig. 1 is a longitudinal sectional view of the motor of the application;

[0057] Fig. 2 is a sectional view of the gas-liquid mixed cooling complete machine (such as a compressor) of the application;

[0058] Fig. 3 is an external structure view of the motor of the application (preferably a top view of the upper end of the motor);

[0059] Fig. 4 is a top view of the internal water channel of the motor of the application;

[0060] Fig. 5 is a left side view of Fig. 4.

[0061] The reference signs are as follows: 1, casing; 2, stator; 3, high-speed rotor; 4, first-stage radial bearing seat; 5, second-stage radial bearing seat; 6, first-stage radial bearing; 7, second-stage radial bearing; 8, first-stage diffuser; 9, second-stage diffuser; 10, front axial bearing; 11, rear axial bearing; 12, thrust disc; 13, cooling water flow channel; 14, first-stage impeller; 15, second-stage impeller; 16, first-stage volute; 17, second-stage volute; 18, connecting pipe; 19, compressed gas outlet; 20, gas cooling inlet; 21, cooling air flow channel; 211, first air channel; 212, second air channel; 213, communication air channel; 22, first air guide through hole; 23, second air guide through hole; 24, gas cooling outlet; 25, water cooling inlet; 26, water cooling outlet; 27, first circumferential water flow channel; 28, first connecting water flow channel; 29, second circumferential water flow channel; 30, second connecting water flow channel. DETAILED DESCRIPTION

[0062] Clearly, the described embodiments are only some, but not all of all possible embodiments. The descriptions of the at least one example embodiment are merely illustrative in nature and do not limit the scope of the application or its application or utilization in any way. Based upon the embodiments disclosed in the application, numerous other embodiments will be made apparent to one of ordinary skill in the art without needing to make any inventive step.

[0063] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0064] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless otherwise specifically stated. It is to be understood that the drawings shown in the figures are not drawn to scale and that the dimensions of the various parts are not necessarily to scale. Techniques, methods, and apparatus known to those of ordinary skill are not discussed in detail because they can hinder understanding of the present application. In all examples shown and discussed herein, any specific value is to be interpreted as merely illustrative and not as a limitation. Thus, other examples of the example embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0065] In the description of the present application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, without the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0066] For purposes of the description hereinafter, spatial relations terms, such as "above", "below", "upper", "lower", and the like, can be used with respect to the device or feature under discussion. These spatial relation terms are used only to illustrate the relative spatial relationship between the device or feature under discussion and other devices or features as shown in the figures. It will be understood that the spatial relation terms are intended to encompass different orientations of the device or feature in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then a device or feature described as "above" or "up" other devices or features would then be oriented "below" or "down" the other devices or features. Accordingly, the exemplary spatial relation terms "above" and "below" can encompass both the orientations "above" and "below". The device can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatial relation terms used herein interpreted accordingly.

[0067] In addition, it should be noted that the use of "first", "second", and the like, terminology to describe various components is merely used to differentiate one component from another and is not intended to or should be construed to special rank, unless otherwise indicated.

[0068] As shown in FIGS. 1-5, the present application provides a casing (preferably a motor casing or a casing of a rotating machine, such as a compressor casing, etc.) with cooling performance, wherein:

[0069] The inner wall and the outer wall of the casing 1 are provided with a cooling water flow channel 13, the cooling water flow channel 13 comprises a first circumferential water flow channel 27, a first connecting water flow channel 28 and a second circumferential water flow channel 29, the first circumferential water flow channel 27 extends along a first circumferential direction of the casing 1 in the direction of water flow, the second circumferential water flow channel 29 extends along a second circumferential direction of the casing 1 in the direction of water flow, the first circumferential direction and the second circumferential direction are opposite in the projection plane of the axial end surface of the casing 1, and the first circumferential water flow channel 27 and the second circumferential water flow channel 29 are located at different positions in the axial direction of the casing 1, one end of the first connecting water flow channel 28 is in communication with one end of the first circumferential water flow channel 27, and the other end of the first connecting water flow channel 28 is in communication with one end of the second circumferential water flow channel 29, so that the first circumferential water flow channel 27, the first connecting water flow channel 28 and the second circumferential water flow channel 29 are sequentially communicated to form a water passage allowing water flow.

[0070] The application sets the cooling water flow channel between the inner and outer walls of the casing, and the cooling water flow channel comprises a first circumferential water flow channel, a first connecting water flow channel and a second circumferential water flow channel, the first circumferential water flow channel extends along a first circumferential direction, the second circumferential water flow channel extends along a second circumferential direction opposite to the first circumferential direction, and the first and second circumferential water flow channels are located at different positions in the axial direction, so that the cooling water flow channel is formed into a circumferential back-and-forth reciprocating and axial overlapping water flow channel, so that the water in the first circumferential water flow channel cools and dissipates heat to the inside of the casing along the first circumferential direction, then travels to the second circumferential water flow channel along the axial direction, and cools and dissipates heat to the inside of the casing along the second circumferential direction, greatly increasing the contact area between the cooling water and the casing, improving the heat exchange efficiency between the casing and the internal components of the casing, and improving the cooling efficiency of the motor, avoiding the occurrence of high temperature rise during the operation of the motor, and causing the heat dissipation performance to decrease.

[0071] In some embodiments,

[0072] The first circumferential water flow channel 27, the first connecting water flow channel 28 and the second circumferential water flow channel 29 constitute a group of water flow channel units, and there are at least two groups of water flow channel units, the at least two groups of water flow channel units are arranged along the axial direction of the casing 1, and the second connecting water flow channel 30 is used for connecting two adjacent groups of water flow channel units.

[0073] This is a further preferred structure of the cooling water flow channel of the application, that is, the first and second circumferential water flow channels and the first connecting water flow channel connected therebetween constitute a group of water flow channel units, and through the arrangement of multiple groups of water flow channel units in the axial direction, the water flow path can be further increased, the contact area between the cooling water and the casing is further increased, the cooling and heat dissipation area is further increased, and the cooling and heat dissipation effect and performance of the motor are further improved; the second connecting water flow channel is used for connecting two adjacent groups of water flow channel units.

[0074] The casing 1 of the application is provided with a cooling water flow channel 13, as shown in FIGS. 3 and 4, the cooling water flow channel 13 comprises a water cooling inlet 25, a water cooling first straight channel (first circumferential water flow channel 27), a water cooling first U-shaped channel (first connecting water flow channel 28), a water cooling second straight channel (second circumferential water flow channel 29), a water cooling second U-shaped channel (second connecting water flow channel 30) and a water cooling outlet 26. The cooling water enters the first circumferential water flow channel 27 inside the casing from the water cooling inlet 25, enters the first connecting water flow channel 28 in a large circumferential angle around the casing in a first rotating direction, the cooling water flows through the second circumferential water flow channel 29 from the first connecting water flow channel 28, enters the second connecting water flow channel 30 in the same circumferential angle around the casing in a second rotating direction, and flows out of the casing from the water cooling outlet 26 along the circumferential reciprocating and axial overlapping water flow channel, and the first rotating direction and the second rotating direction are opposite.

[0075] In some embodiments,

[0076] The first circumferential water flow channel 27 has a distribution angle range of greater than 180° and less than 360° in the circumferential direction of the casing 1, so that the first circumferential water flow channel 27 forms a non-continuous portion in the circumferential direction. The second circumferential water flow channel 29 has a distribution angle range of greater than 180° and less than 360° in the circumferential direction of the casing 1, so that the second circumferential water flow channel 29 forms a non-continuous portion in the circumferential direction. The non-continuous portion formed by the first circumferential water flow channel 27 and the non-continuous portion formed by the second circumferential water flow channel 29 at least partially overlap in the projection plane of the axial end surface of the casing 1, forming a non-continuous portion of the cooling water flow channel 13 in the circumferential direction.

[0077] The present application further provides a cooling water flow channel that reciprocates in the circumferential direction and advances in the axial direction, so that the cooling water flow channel forms a non-continuous portion in the circumferential direction. The cooling air flow channel is arranged on the casing at a position corresponding to the non-continuous portion of the cooling water flow channel, so that the water flow channel and the air flow channel do not overlap in the circumferential direction of the casing. The cooling water flow channel increases the contact area with the casing for heat dissipation, while ensuring the purpose and effect of the cooling air flow channel for ventilation and heat dissipation of the interior of the casing. The thickness of the casing is the same as that of a single water-cooled casing, which is greatly reduced compared to the thickness of a water-air mixed cooling casing of the prior art. The thickness of the casing is reduced, and the cooling and heat dissipation performance is improved.

[0078] In some embodiments,

[0079] The first circumferential water flow channel 27 has a distribution angle range of 300° to 350° in the circumferential direction of the casing 1, and the second circumferential water flow channel 29 has a distribution angle range of 300° to 350° in the circumferential direction of the casing 1. The cross section of the cooling water flow channel 13 is in a rectangular structure, which includes adjacent first and second sides. The length of the first side is a, the length of the second side is b, and a / b = 0.5 to 1.

[0080] The present application further provides that the first and second circumferential water flow channels have a distribution angle range of 300° to 350° in the circumferential direction of the casing, which can further increase the extension length of the first and second circumferential water flow channels in the circumferential direction, further increase the contact area between the cooling water and the casing and the cooling and heat dissipation area, further improve the cooling and heat dissipation effect and performance of the motor, and the length of the cooling water flow channel is b and the width is a. When the value of the length-width ratio a / b is 0.5 to 1, the flow resistance is relatively small and the heat exchange efficiency is relatively high under this proportional condition.

[0081] In some embodiments,

[0082] The first circumferential water flow channel 27 is in an arc structure in the projection plane of the axial end surface of the shell 1, and the arc range of the first circumferential water flow channel 27 is greater than 180° and less than 360°. The second circumferential water flow channel 29 is in an arc structure, and the arc range of the second circumferential water flow channel 29 is greater than 180° and less than 360°.

[0083] This is the preferred structure of the first and second circumferential water flow channels of the present application, that is, both are in the structure of an arc flow channel, and the arc range is greater than 180° and less than 360°, which can increase the distribution length and area in the circumferential direction as much as possible, increase the contact area and heat dissipation area of the shell, improve the cooling and heat dissipation effect, and less than 360° can form a non-connection part, which is convenient for setting a cooling air flow channel, can increase the water cooling effect while ensuring the gas cooling effect, and does not increase the volume of the shell.

[0084] In some embodiments,

[0085] The shell 1 is in a cylindrical structure with a central axis, the center of the first circumferential water flow channel 27 is located on the central axis of the shell 1, and the center of the second circumferential water flow channel 29 is also located on the central axis of the shell 1; and / or,

[0086] In the projection plane passing through the central axis of the shell 1, the first circumferential water flow channel 27 is in a straight flow channel structure, the second circumferential water flow channel 29 is also in a straight flow channel structure, the first connecting water flow channel 28 is in a U-shaped tube flow channel, and the second connecting water flow channel 30 is also in a U-shaped tube flow channel.

[0087] The shell of the present application is preferably in a cylindrical structure with a central axis, and the centers of the first and second circumferential water flow channels are located on the central axis of the shell, which can form a structure as symmetrical as possible, is convenient for processing, and improves the uniformity of cooling and heat dissipation; the first and second circumferential water flow channels of the present application are in a straight flow channel structure in the overhead structure or in the projection plane of the horizontal plane (in the three-dimensional structure, it is a curved flow channel extending in the circumferential direction), and the first and second connecting water flow channels are preferably U-shaped tube flow channels extending in the axial direction and connecting the first and second circumferential water flow channels, which ensures the smoothness of the water path and the continuous and effective cooling effect.

[0088] In some embodiments,

[0089] The shell 1 is also provided with a water cooling inlet 25 and a water cooling outlet 26, one end of the water flow channel unit at one axial end is in communication with the water cooling inlet 25, and one end of the water flow channel unit at the other axial end is in communication with the water cooling outlet 26.

[0090] The water cooling inlet is arranged at the uppermost end of the shell, so that the gravity of the water can be effectively utilized to flow from top to bottom. The water cooling outlet is arranged opposite to the water cooling inlet in the axial direction, so that the distribution area of the cooling water flow channel is increased, and the cooling effect is further improved. The water cooling inlet and the water cooling outlet are arranged at the two end faces or near the two end faces of the shell in the axial direction as much as possible, so that the length of the cooling water flow channel in the axial direction is maximized, the contact area and the heat dissipation area of the cooling water and the shell are further increased, and the cooling effect and the cooling performance of the motor are further improved.

[0091] In some embodiments,

[0092] The water cooling inlet 25 is arranged on the outer wall of the uppermost end of the shell 1, and the water cooling outlet 26 is arranged opposite to the water cooling inlet 25 in the axial direction of the shell 1. The axial distance between the water cooling inlet 25 and one end face of the shell 1 in the axial direction is less than a first preset distance, and the axial distance between the water cooling outlet 26 and the other end face of the shell 1 in the axial direction is less than a second preset distance.

[0093] The water cooling inlet is arranged at the uppermost end of the shell, so that the gravity of the water can be effectively utilized to flow from top to bottom. The water cooling outlet is arranged opposite to the water cooling inlet in the axial direction, so that the distribution area of the cooling water flow channel is increased, and the cooling effect is further improved. The water cooling inlet and the water cooling outlet are arranged at the two end faces or near the two end faces of the shell in the axial direction as much as possible, so that the length of the cooling water flow channel in the axial direction is maximized, the contact area and the heat dissipation area of the cooling water and the shell are further increased, and the cooling effect and the cooling performance of the motor are further improved.

[0094] The cooling water flow channel is preferably arranged above the motor in the circumferential direction, so that the flow resistance is reduced. The water cooling outlet 26 is arranged in the same axial direction of the water cooling inlet 25, and is arranged as close to the end face of the shell 1 as possible, so that the contact area of the cooling water flow channel 13 and the shell is increased, the heat conduction area is increased, and the cooling efficiency of the whole machine is improved.

[0095] In some embodiments,

[0096] The cooling gas flow channel 21 is arranged between the inner wall and the outer wall of the shell 1, and is not communicated with the cooling water flow channel 13. In the projection plane of the axial end face of the shell 1, the cooling gas flow channel 21 and the cooling water flow channel 13 do not overlap, and the cooling gas flow channel 21 and the cooling water flow channel 13 are staggered in the circumferential direction.

[0097] The cooling air flow channel of the application is arranged at a position on the shell which is circumferentially staggered with the cooling water flow channel, so that the water channel and the air channel do not overlap in the circumferential direction of the shell. While increasing the contact area with the shell through the cooling water flow channel, the purpose and effect of the air channel for ventilating and cooling the interior of the shell are ensured. The shell has the same thickness as the single water-cooled shell, and the thickness is greatly reduced compared with the water-air mixed cooling shell of the prior art. The thickness of the shell is reduced, and the cooling and heat dissipation performance is improved.

[0098] The cooling water flow channel 13 of the application is staggered with the cooling air flow channel 21 in the circumferential direction of the shell 1, that is, the air-cooling + liquid-cooling mixed cooling structure shell is arranged without increasing the thickness of the shell. The cooling air flow channel 21 is arranged in the radial direction, and the required shell position is relatively small. Therefore, the angle of the cooling water flow channel 13 in the circumferential direction of the shell is more than 300°. Without affecting the strength of the shell and contacting the cooling air flow channel 21, the larger the angle, the better.

[0099] The circumferential reciprocating axial cooling water flow channel 13 of the application is staggered with the cooling air flow channel 21 in the circumferential direction of the shell 1. Compared with the traditional spiral water channel, the cooling water flow channel 13 and the shell 1 are almost fully contacted in the axial and circumferential directions. The heat exchange between the stator 2 in the shell 1 is uniform, which avoids the problem that the local area of the stator and the glue-filled wire package has low heat exchange efficiency due to being far away from the water channel, resulting in high temperature rise and abnormal failure of the motor. The reliability and service life of the whole machine are improved.

[0100] In some embodiments,

[0101] When the cooling water flow channel 13 has a non-connected part in the circumferential direction, the cooling air flow channel 21 is arranged at the position of the non-connected part of the cooling water flow channel 13 in the circumferential direction.

[0102] The cooling air flow channel of the application is preferably arranged at a position on the shell which is circumferentially staggered with the cooling water flow channel, so that the water channel and the air channel do not overlap in the circumferential direction of the shell. While increasing the contact area with the shell through the cooling water flow channel, the purpose and effect of the air channel for ventilating and cooling the interior of the shell are ensured. The shell has the same thickness as the single water-cooled shell, and the thickness is greatly reduced compared with the water-air mixed cooling shell of the prior art. The thickness of the shell is reduced, and the cooling and heat dissipation performance is improved.

[0103] In some embodiments,

[0104] The cooling air flow channel 21 includes a first air channel 211 and a second air channel 212 arranged in a radial direction of the casing 1, the first air channel 211 extends in an axial direction of the casing 1, the second air channel 212 also extends in the axial direction of the casing 1, and the first air channel 211 and the second air channel 212 are communicated through a communication air channel 213.

[0105] The cooling air flow channel is arranged as the first and second air channels arranged in the radial direction, and the radial bidirectional axial cooling air flow channel is formed at the circumferential interval of the casing water channel, so that the gas enters the casing, is cooled by the water channel, and then enters the motor cavity to cool the key components such as the stator and the rotor and the bearing, thereby further improving the cooling and heat dissipation effect of the motor interior, and the multiple radial air cooling flow channels reduce the arrangement space of the cooling air flow channel in the circumferential direction of the casing, increase the heat exchange area of the high-pressure gas and the casing cooling water, improve the gas cooling efficiency, and further improve the cooling and heat dissipation effect of the motor interior.

[0106] The casing 1 is provided with a cooling air flow channel, as shown in FIGS. 3 and 4, the cooling air flow channel includes a compressed gas outlet 19, a gas cooling inlet 20, a cooling air flow channel 21, a first air guide through hole 22, a second air guide through hole 23 (preferably an L-shaped air guide hole), a gas cooling outlet 24, wherein the high-pressure gas enters the casing from the gas cooling inlet 20 through the pipeline, the cooled high-pressure gas is divided into two parts at the first air guide through hole 22, one part of the cooled high-pressure gas flows through the first air guide through hole 22 into the first-stage side to cool the front axial bearing 10 and the rear axial bearing 11 of the axial rotating system, and the other part of the cooled high-pressure gas enters the second-stage side through the cooling air flow channel 21 and the second air guide through hole 23 of the casing to cool the end cover and the radial bearing of the second-stage side. The cooling air flow channel 21 is arranged with two axial air channels in the radial direction of the casing, which reduces the space of the cooling air flow channel 21 in the circumferential direction of the casing 1, increases the heat exchange area of the high-pressure gas and the casing cooling water, and improves the gas cooling efficiency.

[0107] In some embodiments,

[0108] The outer wall of the casing 1 is provided with a gas cooling inlet 20, the gas cooling inlet 20 is communicated with one end of the first air channel 211, the first air channel 211 extends in the axial direction and is communicated with the axial one end of the second air channel 212 through the communication air channel 213, the axial one end of the casing 1 is provided with a first air guide through hole 22, the first air guide through hole 22 is communicated with the axial one end of the second air channel 212 to guide the gas into the axial one end of the casing 1, and the axial other end of the casing 1 is provided with a second air guide through hole 23, the second air guide through hole 23 is communicated with the axial other end of the second air channel 212 to guide the gas into the axial other end of the casing 1.

[0109] The first air guide through hole and the second air guide through hole can supply air to the inside of the casing from the axial two ends of the casing respectively, further improving the air supply amount to the inside of the casing, and further improving the cooling performance of the plurality of components in the inside of the casing.

[0110] The application further provides an electric machine comprising the casing with the cooling performance.

[0111] The application provides a casing and an electric machine cooled by air-liquid mixture, as shown in FIG. 1 and FIG. 2, which comprises a casing 1, a stator 2 and a high-speed rotor 3; a first-stage radial bearing seat 4 and a second-stage radial bearing seat 5 are respectively arranged at the two ends of the casing 1, and a first-stage radial bearing 6 and a second-stage radial bearing 7 are respectively arranged on the first-stage radial bearing seat 4 and the second-stage radial bearing seat 5; a first-stage diffuser 8 and a second-stage diffuser 9 are respectively arranged on the left and right sides of the casing 1, and a front axial bearing 10 and a rear axial bearing 11 are respectively arranged on the first-stage diffuser 8 and the first-stage radial bearing seat 4; the high-speed rotor 3 is arranged to pass through the first-stage radial bearing seat 4 and the first-stage diffuser 8, the second-stage radial bearing seat 5 and the second-stage diffuser 9 in sequence from left to right, and a first-stage impeller 14 and a second-stage impeller 15 are respectively arranged on the high-speed rotor 3; an interference-fitted thrust disc 12 is arranged on the high-speed rotor 3, and the thrust disc 12 is arranged between the front axial bearing 10 and the rear axial bearing 11; a first-stage volute 16 and a second-stage volute 17 are respectively arranged on the left and right sides of the first-stage impeller 14 and the second-stage impeller 15, and the first-stage volute 16 and the second-stage volute 17 are connected through a connecting pipe 18; a compressed gas outlet 19 is arranged on the connecting pipe 18, and the compressed gas outlet 19 is connected to an electric machine cavity through a pipeline and an air cooling inlet 20 after being cooled by the casing.

[0112] In some embodiments,

[0113] When the water cooling inlet 25 and the water cooling outlet 26 are further arranged on the casing 1, the electric machine further comprises the stator 2, and the water cooling inlet 25 is arranged on the casing 1 in the radial direction and opposite to the outgoing line side of the stator 2.

[0114] The water cooling inlet 25 is preferably arranged on the outgoing line end side of the stator 2 in the axial direction, and the stator is preferentially cooled at a high temperature rise position and then cooled at a low temperature rise position on the non-outgoing line end side of the stator through the casing, so that the heat dissipation and cooling are targeted, and the heat dissipation performance of the electric machine is improved.

[0115] The application further provides a compressor comprising the electric machine.

[0116] The application provides a casing structure and motor of gas-liquid mixed cooling, which is characterized by the following: the casing is provided with a circumferential reciprocating axial inductive water channel and an axial air channel for cooling the motor; the water channel of the casing is circumferentially reciprocating and axially inductive; the air channel circulates along the axial direction and passes into the cavity from the two side end faces of the casing; the casing, the stator and the rotor are cooled; the heat exchange efficiency of the motor system is improved; the stability and service life of the whole motor system are improved; the problem of high temperature rise of the motor during operation is solved; the temperature rise of the stator, the rotor and the key parts of the motor is reduced without increasing the thickness of the casing; and the service life and reliability of the motor are improved.

[0117] The above merely describes the preferred embodiments of the application, but should not be used to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the application. The above merely describes the preferred embodiments of the application, but should not be used to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A cabinet with cooling performance, characterized in that: a cooling water flow channel (13) is arranged between the inner wall and the outer wall of the cabinet (1), the cooling water flow channel (13) comprises a first circumferential water flow channel (27), a first connecting water flow channel (28) and a second circumferential water flow channel (29), the first circumferential water flow channel (27) extends along a first circumferential direction of the cabinet (1) in the direction of water flow, the second circumferential water flow channel (29) extends along a second circumferential direction of the cabinet (1) in the direction of water flow, the first circumferential direction and the second circumferential direction are opposite in the projection plane of the axial end surface of the cabinet (1), and the first circumferential water flow channel (27) and the second circumferential water flow channel (29) are located at different positions in the axial direction of the cabinet (1), one end of the first connecting water flow channel (28) is in communication with one end of the first circumferential water flow channel (27), and the other end of the first connecting water flow channel (28) is in communication with one end of the second circumferential water flow channel (29), so that the first circumferential water flow channel (27), the first connecting water flow channel (28) and the second circumferential water flow channel (29) are sequentially communicated to form a water passage allowing water flow.

2. The cabinet with cooling performance according to claim 1, characterized in that: the first circumferential water flow channel (27), the first connecting water flow channel (28) and the second circumferential water flow channel (29) constitute a water flow channel unit, and there are at least two water flow channel units, and the at least two water flow channel units are arranged along the axial direction of the cabinet (1), and the adjacent two water flow channel units are communicated through a second connecting water flow channel (30).

3. The cabinet with cooling performance according to claim 2, characterized in that: the distribution angle range of the first circumferential water flow channel (27) in the circumferential direction of the cabinet (1) is greater than 180° and less than 360°, so that the first circumferential water flow channel (27) forms a non-continuous part in the circumferential direction, the distribution angle range of the second circumferential water flow channel (29) in the circumferential direction of the cabinet (1) is greater than 180° and less than 360°, so that the second circumferential water flow channel (29) forms a non-continuous part in the circumferential direction, and the non-continuous part formed by the first circumferential water flow channel (27) and the non-continuous part formed by the second circumferential water flow channel (29) at least partially overlap in the projection plane of the axial end surface of the cabinet (1), forming a non-continuous part of the cooling water flow channel (13) in the circumferential direction.

4. The cabinet with cooling performance according to claim 3, characterized in that: the distribution angle range of the first circumferential water flow channel (27) in the circumferential direction of the cabinet (1) is 300°-350°, and the distribution angle range of the second circumferential water flow channel (29) in the circumferential direction of the cabinet (1) is 300°-350°; the cross section of the flow channel of the cooling water flow channel (13) is a rectangular structure, the rectangle includes adjacent first side and second side, the length of the first side is a, the length of the second side is b, and a / b=0.5-1. ​ ​ ​ ​ 5. The cabinet with cooling performance according to claim 3, characterized in that: in the projection plane of the axial end surface of the cabinet (1), the first circumferential water flow channel (27) is in an arc structure, and the arc range of the first circumferential water flow channel (27) is greater than 180° and less than 360°, and the second circumferential water flow channel (29) is in an arc structure, and the arc range of the second circumferential water flow channel (29) is greater than 180° and less than 360°.

6. The cabinet with cooling performance according to claim 5, characterized in that: the cabinet (1) is in a cylindrical structure, has a central axis, the center of the first circumferential water flow channel (27) is located on the central axis of the cabinet (1), and the center of the second circumferential water flow channel (29) is also located on the central axis of the cabinet (1); and / or, in the projection plane of the plane passing through the central axis of the cabinet (1), the first circumferential water flow channel (27) is in a straight channel structure, the second circumferential water flow channel (29) is also in a straight channel structure, the first connecting water flow channel (28) is in a U-shaped tube flow channel, and the second connecting water flow channel (30) is also in a U-shaped tube flow channel.

7. The cabinet with cooling performance according to claim 2, characterized in that: the cabinet (1) is further provided with a water cooling inlet (25) and a water cooling outlet (26), one end of the water flow channel unit located at one axial end is in communication with the water cooling inlet (25), and one end of the water flow channel unit located at the other axial end is in communication with the water cooling outlet (26).

8. The cabinet with cooling performance according to claim 7, characterized in that: the water cooling inlet (25) is arranged on the outer wall of the uppermost end of the cabinet (1), the water cooling outlet (26) is arranged opposite to the water cooling inlet (25) in the axial direction of the cabinet (1), the axial distance between the water cooling inlet (25) and the axial end surface of the cabinet (1) is less than a first predetermined distance, and the axial distance between the water cooling outlet (26) and the axial end surface of the cabinet (1) is less than a second predetermined distance.

9. The cabinet with cooling performance according to any one of claims 1-8, characterized in that: the inner wall and the outer wall of the cabinet (1) are further provided with a cooling air flow channel (21), the cooling air flow channel (21) is not in communication with the cooling water flow channel (13), and in the projection plane of the axial end surface of the cabinet (1), the cooling air flow channel (21) and the cooling water flow channel (13) do not overlap, forming a structure in which the cooling air flow channel (21) and the cooling water flow channel (13) are staggered in the circumferential direction.

10. The cabinet with cooling performance according to claim 9, characterized in that: when the cooling water flow channel (13) has a circumferential direction non-connection part, the cooling air flow channel (21) is arranged at the position of the circumferential direction non-connection part of the cooling water flow channel (13).

11. The cabinet with cooling performance according to claim 9, characterized in that: The cooling air flow channel (21) comprises a first air channel (211) and a second air channel (212) arranged in a radial direction of the casing (1), the first air channel (211) extends in an axial direction of the casing (1), the second air channel (212) also extends in the axial direction of the casing (1), and the first air channel (211) and the second air channel (212) are communicated through a communication channel (213).

12. The casing with cooling performance according to claim 11, characterized in that: The outer wall of the casing (1) is provided with an air cooling inlet (20), the air cooling inlet (20) is communicated with one end of the first air channel (211), the first air channel (211) extends in the axial direction and is communicated with one end of the second air channel (212) through the communication channel (213), one end of the casing (1) is provided with a first air guide through hole (22), the first air guide through hole (22) is communicated with one end of the second air channel (212) to guide the gas into one end of the casing (1), and the other end of the casing (1) is provided with a second air guide through hole (23), the second air guide through hole (23) is communicated with the other end of the second air channel (212) to guide the gas into the other end of the casing (1).

13. The casing with cooling performance according to claim 1, characterized in that: The cooling water flow channel (13) further comprises a water cooling inlet (25), a second connecting water flow channel (30) and a water cooling outlet (26); The cooling water enters the first circumferential water flow channel (27) inside the casing (1) from the water cooling inlet (25), enters the first connecting water flow channel (28) in a first rotating direction around the casing (1) in a circumferential direction, flows from the first connecting water flow channel (28) to the second circumferential water flow channel (29) in a second rotating direction around the casing (1) in a circumferential direction, and flows out of the casing (1) from the water cooling outlet (26) along the circumferential reciprocating axial drop channel, and the first rotating direction is opposite to the second rotating direction.

14. The casing with cooling performance according to claim 7, characterized in that: The water cooling outlet (26) is arranged in the same axial direction of the water cooling inlet (25) along the casing (1).

15. The casing with cooling performance according to claim 9, characterized in that: The cooling gas flow channel (21) further comprises a compressed gas outlet (19), a gas cooling inlet (20), a cooling gas flow channel (21), a first gas guide through hole (22), a second gas guide through hole (23) and a gas cooling outlet (24), wherein the high pressure gas enters the casing (1) from the gas cooling inlet (20) through a pipeline for cooling, and the cooled high pressure gas is divided into two parts at the first gas guide through hole (22), one part of the cooled high pressure gas flows through the first gas guide through hole (22) into the primary side to cool the front axial bearing (10) and the rear axial bearing (11) of the axial rotating system, and the other part of the cooled high pressure gas enters the secondary side through the cooling gas flow channel (21) and the second gas guide through hole (23) of the casing (1) to cool the end cover and the radial bearing of the secondary side.

16. An electric machine characterized by: The casing with cooling performance according to any one of claims 1-15.

17. The motor according to claim 16, characterized in that: When the casing (1) is further provided with a water cooling inlet (25) and a water cooling outlet (26), the motor further comprises a stator (2), and the water cooling inlet (25) is arranged opposite to the outgoing line side of the stator (2) in the radial direction of the casing (1).

18. The motor according to claim 17, characterized in that: The motor comprises a stator (2) and a high-speed rotor (3), and a primary radial bearing seat (4) and a secondary radial bearing seat (5) supporting the high-speed rotor (3), the primary radial bearing seat (4) and the secondary radial bearing seat (5) are respectively built-in installed at both ends of the casing (1), and the primary radial bearing seat (4) and the secondary radial bearing seat (5) are respectively provided with a primary radial bearing (6) and a secondary radial bearing (7); the motor further comprises a primary diffuser (8) and a secondary diffuser (9) installed on the left and right outer sides of the casing (1), and a front axial bearing (10) and a rear axial bearing (11) are respectively installed on the left and right of the primary diffuser (8) and the primary radial bearing seat (5); the high-speed rotor (3) passes through the primary radial bearing seat (4) and the primary diffuser (8), the secondary radial bearing seat (5) and the secondary diffuser (9) in sequence at both ends, and is respectively provided with a primary impeller (14) and a secondary impeller (15), the high-speed rotor (3) is provided with an interference-fitted thrust disc (12) arranged between the front axial bearing (10) and the rear axial bearing (11); the primary impeller (14) and the secondary impeller (15) are respectively provided with a primary volute (16) and a secondary volute (17) on the outer side, the primary volute (16) and the secondary volute (17) are connected through a connecting pipe (18), and the connecting pipe (18) is provided with a compressed gas outlet (19) and a gas cooling inlet (20) connected to the motor cavity after cooling in the casing (1).

19. The motor according to claim 17, characterized in that: The motor is provided with a cooling water flow channel (13) above the motor, and the cooling water flow channel (13) is a cooling water flow channel (13) arranged in the machine housing with cooling performance according to any one of claims 1-8.

20. A compressor characterized by: The motor comprises the motor according to any one of claims 16-19.

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