Motor cooling system and air compressor

Abstract

The invention provides a motor cooling system and an air compressor, and belongs to the technical field of equipment cooling. The motor cooling system comprises a cooling gas pipeline, a heat exchanger, a fan and a controller; the two ends of the cooling gas pipeline are both communicated with an inner cavity of the motor, and at least part of the cooling gas pipeline is in heat exchange connection with the heat exchanger; the fan is positioned on the cooling air pipeline; and the controller is used for adjusting the heat exchange amount of the heat exchanger and the rotating speed of the fan. According to the motor cooling device, the cooling gas loop is formed between the cooling gas pipeline and the inner cavity of the motor, gas in the cooling gas loop does not make contact with outside air, corrosion of acid-base gas or salt and the like to the motor is avoided, and therefore the service life of the motor is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of equipment cooling, and in particular to a motor cooling system and an air compressor. Background Art

[0002] For equipment such as air compressors, the power consumption demand for the motor is relatively large. Therefore, a cooling system is required to cool the motor to prevent the motor from overheating and damage.

[0003] The cooling system uses the air in the environment to exchange heat with the motor to achieve cooling.

[0004] However, the acidic and alkaline gases or salt in the air will corrode the motor, thereby reducing its service life. Summary of the invention

[0005] The embodiments of the present disclosure provide a motor cooling system and an air compressor, which can solve the technical problems existing in the related technologies. The technical solutions of the motor cooling system and the air compressor are as follows:

[0006] On the one hand, an embodiment of the present disclosure provides a motor cooling system, the motor cooling system comprising a cooling air pipeline, a heat exchanger, a fan and a controller;

[0007] Both ends of the cooling air pipeline are connected to the inner cavity of the motor, and at least part of the cooling air pipeline is connected to the heat exchanger for heat exchange;

[0008] The fan is located on the cooling air pipeline;

[0009] The controller is used to adjust the heat exchange amount of the heat exchanger and the rotation speed of the fan.

[0010] In a possible implementation, the motor cooling system further includes an air supply device and a pressure sensor;

[0011] The gas supply device is in communication with the inner cavity of the motor and is used to inject gas into the inner cavity;

[0012] The pressure sensor is located in the inner cavity, and is used to detect the pressure value in the inner cavity and send the pressure value to the controller;

[0013] The controller is also used to control the air supplement device to work based on the pressure value, so that the pressure value in the inner cavity is in a positive pressure state.

[0014] In a possible implementation, the motor cooling system further includes a first temperature sensor;

[0015] The first temperature sensor is located in the inner cavity, and is used to detect a first temperature of the inner cavity and send the first temperature to a controller;

[0016] The controller is also used to control the operation of the air supply device based on the first temperature and the pressure value, and adjust the heat exchange amount of the heat exchanger and the rotation speed of the fan.

[0017] In a possible implementation, the motor cooling system further includes a pressure relief pipeline, and the pressure relief pipeline is connected to the inner cavity;

[0018] The controller is also used to control the operation of the pressure relief pipeline based on the first temperature and the pressure value.

[0019] In a possible implementation, the motor cooling system further includes a coolant pipeline and a cooling device;

[0020] The coolant pipeline surrounds the outside of the stator of the motor, the outlet of the coolant pipeline is connected to the inlet of the cooling device through a first connecting pipeline, and the inlet of the coolant pipeline is connected to the outlet of the cooling device through a second connecting pipeline.

[0021] In a possible implementation, the cooling device includes a compressor and a condenser;

[0022] The liquid outlet of the coolant pipeline is connected to the inlet of the compressor through the first connecting pipeline, the outlet of the compressor is connected to the inlet of the condenser, and the outlet of the condenser is connected to the liquid inlet of the coolant pipeline through the second connecting pipeline.

[0023] In a possible implementation, the inlet of the heat exchanger is connected to the outlet of the cooling device through a third connecting pipeline, and the outlet of the heat exchanger is connected to the inlet of the cooling device.

[0024] In a possible implementation, when the motor cooling system includes a first temperature sensor, the motor cooling system further includes a second temperature sensor;

[0025] The second temperature sensor is located on the stator, and is used to detect a second temperature of the stator and send the second temperature to the controller;

[0026] The controller is also used to control the operation of the air supply device based on the first temperature, the pressure value and the second temperature, and to adjust the heat exchange amount of the heat exchanger and the rotation speed of the fan.

[0027] In a possible implementation, the motor cooling system further includes a first flow valve and a second flow valve;

[0028] The first flow valve is located on the third connecting pipeline, and the second flow valve is located on the second connecting pipeline;

[0029] The controller is further configured to adjust the flow of the first flow valve and the flow of the second flow valve based on the first temperature and the second temperature.

[0030] On the other hand, an embodiment of the present disclosure provides an air compressor, characterized in that the air compressor includes a motor cooling system as described in any one of the above items.

[0031] The technical solution provided by the embodiments of the present disclosure includes at least the following beneficial effects:

[0032] The disclosed embodiment provides a motor cooling system, which includes a cooling air pipeline, a heat exchanger and a fan. Both ends of the cooling air pipeline are connected to the inner cavity of the motor. In this way, a cooling air loop is formed between the cooling air pipeline and the inner cavity of the motor. The fan can provide power for the flow of gas in the cooling air loop. The cooling gas enters the inner cavity of the motor after heat exchange and cooling in the heat exchanger. The cooling gas exchanges heat with the motor and takes away the heat in the motor, thereby cooling the motor. The gas after heat exchange with the motor returns to the heat exchanger for heat exchange and cooling. In the above process, the gas in the cooling air loop will not come into contact with the outside air, and will not carry acidic and alkaline gases or salts in the outside air, thereby avoiding corrosion of the motor by acidic and alkaline gases or salts, thereby increasing the service life of the motor.

[0033] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 is a structural schematic diagram of a motor cooling system shown in an embodiment of the present disclosure;

[0036] Figure 2 is a structural schematic diagram of a motor cooling system shown in an embodiment of the present disclosure;

[0037] Figure 3 It is a structural schematic diagram of a motor cooling system shown in an embodiment of the present disclosure.

[0038] Legend

[0039] 1. Cooling air pipeline; 2. Heat exchanger; 3. Fan; 4. Air supply device; 5. Pressure sensor; 6. First temperature sensor; 7. Pressure relief pipeline; 8. Coolant pipeline; 9. Cooling device; 10. First connecting pipeline; 11. Second connecting pipeline; 12. Third connecting pipeline; 13. Second temperature sensor; 14. First flow valve; 15. Second flow valve;

[0040] 91. compressor; 92. condenser;

[0041] 100, motor; 110, inner cavity; 120, stator; 130, rotor. DETAILED DESCRIPTION

[0042] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0044] The present disclosure provides a motor cooling system. Figure 1 The motor cooling system is applied to a motor 100 , which may include a housing, a stator 120 and a rotor 130 .

[0045] The interior of the housing forms an inner cavity 110 of the motor 100 .

[0046] The stator 120 is located in the inner cavity 110 and connected to the housing.

[0047] The first end of the rotor 130 is located in the inner cavity 110 and is rotatably connected to the housing. The housing has a rotor through hole, and the second end of the rotor 130 passes through the rotor through hole and extends outside the housing to output torque outward. The motor 100 also includes a rotating seal, which is located between the inner side wall of the rotor through hole and the outer side wall of the rotor 130, and is used to perform a rotatable sealing connection between the rotor 130 and the rotor through hole.

[0048] like Figure 1 As shown, the motor cooling system provided by the embodiment of the present disclosure includes a cooling air pipeline 1, a heat exchanger 2, a fan 3 and a controller.

[0049] Both ends of the cooling air pipeline 1 are connected to the inner cavity 110 of the motor 100, that is, the shell of the motor 100 has a first air inlet and a first air outlet, and the two ends of the cooling air pipeline 1 are respectively connected to the first air inlet and the second air outlet. In this way, a cooling air loop can be formed between the cooling air pipeline 1 and the inner cavity 110, and the gas can circulate between the cooling air pipeline 1 and the inner cavity 110.

[0050] At least part of the cooling air pipeline 1 is connected to the heat exchanger 2 for heat exchange, and the fan 3 is located on the cooling air pipeline 1 .

[0051] In this way, when the fan 3 is working, the fan 3 can drive the gas in the cooling air pipeline 1 and the gas in the inner cavity 110 to circulate. The gas is cooled by heat exchange in the heat exchanger 2. The cooled gas flows to the inner cavity 110 to exchange heat and cool the motor. The motor is cooled and the gas is heated. The heated gas flows to the heat exchanger 2 again to be cooled again, thereby realizing the circulation of the cooling gas. The gas in the cooling gas circuit does not need to contact the outside air, thus avoiding mixing with corrosive gases such as acidic and alkaline gases and salts in the outside air, avoiding corrosion of the motor by corrosive gases, thereby increasing the service life of the motor.

[0052] In a possible implementation, the heat exchanger 2 may be a device such as an evaporator, or of course, may be other reasonable types of heat exchangers, which is not specifically limited in the embodiments of the present disclosure.

[0053] The controller may be electrically connected to the heat exchanger 2 and the fan 3 to adjust the heat exchange amount of the heat exchanger 2 and the rotation speed of the fan 3 .

[0054] When the motor 100 is working or at a high temperature, the controller can control the heat exchanger 2 to increase the heat exchange amount and control the fan 3 to increase the rotation speed, thereby improving the cooling efficiency of the gas on the motor 100.

[0055] When the motor 100 stops working or the temperature is low, the heat exchanger 2 can be controlled to reduce the heat exchange amount, and the fan 3 can be controlled to reduce the rotation speed, so as to reduce power loss while ensuring sufficient cooling of the motor 100.

[0056] In one possible implementation, the gas in the cooling gas pipeline 1 and the inner cavity 110 of the motor 100 can be any protective gas that is not corrosive to the motor, for example, nitrogen, etc., and of course it can also be other reasonable protective gases, and the embodiments of the present disclosure do not specifically limit this.

[0057] In a possible implementation, in the axial direction of the stator 120, the two ends of the cooling air pipeline 1 are distributed on both sides of the stator 120, that is, in the axial direction of the stator 120, the first air inlet and the first air outlet provided on the housing are respectively located on both sides of the stator 120, so that after the gas in the cooling air pipeline 1 enters the first air inlet, a part of the gas can be discharged along the gap between the stator 120 and the rotor 130 (see Figure 1 The gas flows toward the first gas outlet through the dotted line in the figure, and then flows out from the first gas outlet, so that the gas can exchange heat with both the stator 120 and the rotor 130, thereby improving the cooling efficiency of the motor 100.

[0058] In addition, the cooling efficiency of the motor 100 is improved, so that the windings in the stator 120 can carry a higher current density, and the stator 120 and the rotor 130 dissipate heat faster, so that the size of the stator 120 and the rotor 130 of the motor 100 can be relatively reduced, thereby reducing the size of the entire motor 100.

[0059] In the motor cooling system provided in the embodiment of the present disclosure, the structure for cooling the motor 100 by gas may also have the following configuration:

[0060] In one possible implementation, see Figure 2 The motor cooling system may further include an air supply device 4 and a pressure sensor 5 .

[0061] The air supply device 4 is connected to the inner cavity 110 of the motor 100 and is used to inject gas into the inner cavity 110. That is, the housing of the motor 100 also has a second air inlet, and the air supply device 4 is connected to the second air inlet, and the air supply device 4 can inject gas into the inner cavity 110 through the second air inlet.

[0062] The pressure sensor 5 is located in the inner cavity 110 and is used to detect the pressure value in the inner cavity 110 and send the pressure value to the controller.

[0063] The controller is used to control the air replenishing device 4 to work based on the pressure value, so that the pressure value in the inner cavity 110 is in a positive pressure state, that is, the pressure value in the inner cavity 110 is always greater than other external pressures.

[0064] The purpose of such a setting is that even if a rotating seal is provided between the rotor 130 and the rotor through hole, gaps will inevitably be generated between the rotor 130 and the rotating seal, and between the rotating seal and the rotor through hole when the rotor 130 rotates. The above structure of the motor cooling system in the embodiment of the present disclosure can make the pressure value in the inner cavity 110 always in a positive pressure state, so that the outside air will not enter the inner cavity 110, thereby avoiding the pollution of the gas in the inner cavity 110 by the outside air, avoiding the corrosion of the motor 100, and thus improving the service life of the motor 100.

[0065] In one possible implementation, the air supply device 4 is connected to the inner cavity 110 through an air supply pipeline, and an air supply valve is provided on the air supply pipeline. The controller is electrically connected to the air supply valve. The controller can control whether the air supply device 4 injects gas into the inner cavity 110 by controlling the flow rate of the air supply valve.

[0066] In one possible implementation, see Figure 2 The motor cooling system may further include a first temperature sensor 6 .

[0067] The first temperature sensor 6 is located in the inner cavity 110 , and is used to detect a first temperature of the inner cavity 110 , and send the first temperature to the controller.

[0068] The controller may be electrically connected to the first temperature sensor 6 , and is used to control the operation of the air supply device 4 and adjust the heat exchange amount of the heat exchanger 2 and the rotation speed of the fan 3 based on the first temperature and pressure value.

[0069] In this way, in addition to ensuring that the pressure value in the inner cavity 110 is always in a positive pressure state. When the first temperature is greater than the pre-stored first temperature upper limit, it means that the temperature in the inner cavity 110 of the motor 100 is relatively high. At this time, the controller can control the heat exchanger 2 to increase the heat exchange capacity, thereby improving the cooling efficiency of the gas, and further improving the cooling efficiency of the motor 100. The fan 3 can also be controlled to increase the speed and the air supply device 4 can be controlled to inject gas into the inner cavity 110, thereby adjusting the density and heat capacity of the gas, improving the quality and flow of the gas, and further improving the cooling efficiency of the motor 100.

[0070] Specifically, the controller can also pre-store heat exchange adjustment values, speed adjustment values, air supply volume adjustment values ​​and preset time lengths. In this way, when the controller needs to improve the cooling efficiency, it can first increase the heat exchange of the heat exchanger 2 by the heat exchange adjustment value, increase the speed of the fan 3 by the speed adjustment value, control the air supply device 4 to inject gas of the amount of the air supply volume adjustment value into the inner cavity 110, and then wait for the preset time length, and then compare the received first temperature with the first temperature upper limit. If the current first temperature is still greater than the first temperature upper limit, the heat exchanger 2, the fan 3, and the air supply device 4 are again controlled or adjusted according to the heat exchange adjustment value, the speed adjustment value, and the air supply volume adjustment value, and wait for the preset time length again until the detected first temperature is lower than the first temperature upper limit.

[0071] When the first temperature is lower than the pre-stored lower limit of the first temperature, it means that the heat released by the motor 100 is relatively low and a higher cooling efficiency is no longer required. At this time, the controller can control the heat exchanger 2 to reduce the heat exchange amount, control the fan 3 to reduce the speed, and control the air supply device 4 to stop supplying air (i.e., not injecting gas into the inner cavity 110), thereby ensuring a good cooling efficiency of the motor while reducing power loss.

[0072] Specifically, when the controller needs to adjust the heat exchange of the heat exchanger 2 and the speed of the fan 3, the heat exchange of the heat exchanger 2 can be reduced by the heat exchange adjustment value, and the speed of the fan 3 can be reduced by the speed adjustment value, and then wait for a preset time, and then compare the received first temperature with the first temperature lower limit. If the current first temperature is still lower than the first temperature lower limit, the heat exchanger 2 and the fan 3 are lowered again according to the heat exchange adjustment value and the speed adjustment value, and wait for the preset time again until the detected first temperature is greater than the first temperature lower limit.

[0073] The above-mentioned settings of the first temperature upper limit and the first temperature lower limit can ensure that the first temperature in the inner cavity 110 of the motor 100 is always between the first temperature upper limit and the first temperature lower limit, that is, it is always at a relatively stable temperature, thereby ensuring effective cooling of the motor 100 while reducing unnecessary power loss.

[0074] In one possible implementation, see Figure 2 The motor cooling system may further include a pressure relief pipeline 7 , which is connected to the inner cavity 110 .

[0075] The controller can also control the operation of the pressure relief pipeline 7 based on the first temperature and pressure value. In this way, the controller can store the upper limit of the pressure value in advance. When the pressure value received by the controller is greater than the upper limit of the pressure value, it is necessary to control the air supply device 4 to stop supplying air, and control the pressure relief pipeline 7 to exhaust air outward, thereby reducing the pressure value in the inner cavity 110, so that it is in a safe working state.

[0076] The gas discharged from the pressure relief pipeline 7 can be circulated to the gas replenishing device 4 again for subsequent gas replenishing operations.

[0077] In the embodiment of the present disclosure, in addition to the cooling air pipeline 1 for cooling the motor 100, the motor cooling system may also be provided with a cooling liquid pipeline 8 for further cooling the motor 100. The structure thereof may be as follows:

[0078] See also Figure 3 ( Figure 3 The complete air supply device 4 is not shown in the figure, and the motor cooling system may also include a coolant pipeline 8 and a cooling device 9.

[0079] The coolant pipeline 8 surrounds the outside of the stator 120 of the motor 100 , the outlet of the coolant pipeline 8 is connected to the inlet of the cooling device 9 through the first connecting pipeline 10 , and the inlet of the coolant pipeline 8 is connected to the outlet of the cooling device 9 through the second connecting pipeline 11 .

[0080] A coolant loop is formed between the coolant pipeline 8 and the cooling device 9. When the cooling medium in the coolant loop flows through the coolant pipeline 8, it can cool the stator 120 of the motor 100, take away the heat released by the stator 120, and then flow into the cooling device 9 through the inlet of the cooling device 9, and be cooled again in the cooling device 9. The cooling medium flowing out from the outlet of the cooling device 9 is the cooled medium, and can flow back to the coolant pipeline 8 again to continue cooling the stator 120.

[0081] In this way, while the gas in the cooling gas pipeline 1 cools the inner cavity 110 , the cooling liquid in the cooling liquid pipeline 8 can further cool the stator 120 of the motor 100 , thereby improving the cooling efficiency of the motor 100 .

[0082] Furthermore, a coolant circuit is formed between the coolant pipeline 8 and the cooling device 9, wherein the cooling medium does not need to contact with the outside air, thereby avoiding contamination of the cooling medium by the outside air and corrosion of the motor 100, thereby increasing the service life of the motor 100.

[0083] The cooling medium in the coolant circuit may be a gaseous cooling medium, a liquid cooling medium, or a gas-liquid two-phase cooling medium, which is not limited in the embodiments of the present disclosure.

[0084] In a possible implementation, the cooling medium may be a refrigerant, thus fully utilizing the advantages of the refrigerant's latent heat cooling, high heat transfer coefficient, and low temperature rise, reducing the flow of the cooling medium and thus reducing the size of the motor cooling system.

[0085] In one possible implementation, the coolant pipeline 8 can be spirally wrapped around the outside of the stator 120, thereby increasing the contact area between the coolant pipeline 8 and the stator 120, and the coolant pipeline 8 can cool the stator 120 more evenly, thereby improving the cooling efficiency of the stator 120.

[0086] In a possible implementation, the cooling device 9 may include a compressor 91 and a condenser 92 .

[0087] The liquid outlet of the coolant pipeline 8 is connected to the inlet of the compressor 91 through the first connecting pipeline 10, the outlet of the compressor 91 is connected to the inlet of the condenser 92, and the outlet of the condenser 92 is connected to the liquid inlet of the coolant pipeline 8 through the second connecting pipeline 11.

[0088] In this way, the cooling medium carries a certain amount of heat after exchanging heat with the stator 120 in the coolant pipeline 8, and most of the cooling medium changes from liquid to gas after absorbing heat. Such cooling medium enters the compressor 91 through the first connecting pipeline 10 for compression, and then the compressed cooling medium is condensed and cooled in the condenser 92. The cooling medium discharged from the outlet of the condenser 92 is the cooled medium, and the cooled medium will flow into the coolant pipeline 8 through the second connecting pipeline 11 to continuously cool the stator 120.

[0089] Of course, the cooling device 9 in the embodiment of the present disclosure may also be other reasonable structures, and the embodiment of the present disclosure is not limited to this.

[0090] In the embodiment of the present disclosure, the cooling structure of the motor 100 for the cooling gas pipeline 1 (including the cooling gas pipeline 1, the heat exchanger 2, the fan 3, the air supply device 4, the pressure sensor 5, the first temperature sensor 6, and the pressure relief pipeline 7) and the cooling structure of the motor 100 for the coolant pipeline 8 (including the coolant pipeline 8, the cooling device 9, the first connecting pipeline 10, and the second connecting pipeline 11) can be two independent devices, or the two can be used in combination to improve the performance of the motor cooling system. The following describes several possible structures for combining the two:

[0091] See also Figure 3 The inlet of the heat exchanger 2 can be connected to the outlet of the cooling device 9 through the third connecting pipe 12, and the outlet of the heat exchanger 2 is connected to the inlet of the cooling device 9.

[0092] In this way, the cooling medium cooled by the cooling device 9 can be directly used as the heat exchange medium in the heat exchanger 2 to perform heat exchange cooling on the gas in the cooling gas circuit, without the need to independently set up other refrigeration devices to obtain the heat exchange medium, thereby reducing the size of the motor cooling system.

[0093] Also, in the related art, there is a motor cooling method of directly injecting a refrigerant into the inner cavity of the motor, but due to the inevitable gap between the rotor and the housing of the motor, the refrigerant leaks.

[0094] In the disclosed embodiment, the cooling medium in the coolant circuit can be a refrigerant. In this way, in addition to using the refrigerant to cool the stator 120 in the coolant pipeline 8, the refrigerant is also used to perform heat exchange cooling on the gas in the cooling gas circuit. In this way, the advantages of latent heat cooling, high heat transfer coefficient and low temperature rise of the refrigerant are fully utilized, and the possibility of refrigerant leakage is avoided.

[0095] In a possible implementation, when the motor cooling system includes the first temperature sensor 6 , the motor cooling system may further include a second temperature sensor 13 .

[0096] See also Figure 3 The second temperature sensor 13 is located on the stator 120, and is used to detect a second temperature of the stator 120 and send the second temperature to the controller.

[0097] The controller is also used to control the operation of the air supply device 4 based on the first temperature, the pressure value and the second temperature, and to adjust the heat exchange amount of the heat exchanger 2 and the rotation speed of the fan 3 .

[0098] For example, the controller may pre-store a first temperature upper limit, a first temperature lower limit, a pressure value upper limit, a second temperature upper limit, and a second temperature lower limit.

[0099] When the first temperature is greater than the first temperature upper limit, the second temperature is greater than the second temperature upper limit, and the pressure value is less than the pressure value upper limit, since the heat released by the stator 120 is usually higher than the heat released by the rotor 130, the controller can first control the air supply device 4 to inject gas into the inner cavity 110, control the heat exchanger 2 to increase the heat exchange amount, and control the fan 3 to increase the speed, thereby improving the cooling efficiency of the motor 100 by the gas in the cooling gas pipeline 1 and the inner cavity 110. After the first temperature is reduced to less than the first temperature upper limit by using gas, if the second temperature is still greater than the second temperature upper limit, the heat exchanger 2 can be controlled to reduce the heat exchange amount. Since the second connecting pipeline 11 and the third connecting pipeline 12 are both connected to the outlet of the cooling device 9, when the heat exchange amount of the heat exchanger 2 is reduced, the flow rate of the cooling medium in the third connecting pipeline 12 is reduced, and the flow rate of the cooling medium in the second connecting pipeline 11 is increased, thereby increasing the flow rate of the cooling medium in the coolant circuit, and further improving the cooling efficiency of the coolant pipeline 8 to the stator 120 of the motor 100.

[0100] The above-mentioned combination of the coolant pipeline 8 and the cooling air pipeline 1 can improve the cooling efficiency of the motor 100.

[0101] In one possible implementation, see Figure 3 The motor cooling system may further include a first flow valve 14 and a second flow valve 15 .

[0102] The first flow valve 14 is located on the third connecting pipeline 12 and is used to control the flow of the cooling medium in the third connecting pipeline 12 .

[0103] The second flow valve 15 is located on the second connecting pipeline 11 and is used to control the flow of the cooling medium in the second connecting pipeline 11 .

[0104] The controller is further configured to adjust the flow rate of the first flow valve 14 and the flow rate of the second flow valve 15 based on the first temperature and the second temperature.

[0105] In this way, the controller can control the cooling efficiency of the coolant pipeline 8 on the motor 100 and the cooling efficiency of the gas in the inner cavity 110 on the motor 100 by controlling the flow of the first flow valve 14 and the flow of the second flow valve 15, and can reasonably allocate the two cooling methods.

[0106] For example, when the first temperature is greater than the first temperature upper limit and the second temperature is greater than the second temperature upper limit, the controller may first control the first flow valve 14 to increase the flow rate, thereby improving the heat exchange efficiency of the heat exchanger 2, and further improving the cooling efficiency of the gas in the inner cavity 110 on the motor 100. When the first temperature is reduced to less than the first temperature upper limit, if the second temperature is still greater than the second temperature upper limit, the second flow valve 15 may be controlled to increase the flow rate, and the first flow valve 14 may be controlled to reduce the flow rate, thereby increasing the flow rate of the cooling medium in the coolant pipeline 8, and further improving the cooling efficiency of the coolant pipeline 8 on the stator 120.

[0107] When the first temperature is between the first temperature lower limit and the first temperature upper limit and the second temperature is greater than the second temperature upper limit, the controller can control the second flow valve 15 to increase the flow rate and control the first flow valve 14 to reduce the flow rate, thereby increasing the flow rate of the cooling medium in the coolant pipeline 8, and further improving the cooling efficiency of the coolant pipeline 8 on the stator 120.

[0108] In a possible implementation, the first flow valve 14 and the second flow valve 15 may be reasonable flow-adjustable valves such as throttle valves, and the embodiment of the present disclosure does not specifically limit their types.

[0109] The embodiment of the present disclosure also provides an air compressor, which includes any one of the motor cooling systems described above.

[0110] The technical solution provided by the embodiments of the present disclosure includes at least the following beneficial effects:

[0111] The embodiment of the present disclosure provides a motor cooling system, which includes a cooling air pipeline 1, a heat exchanger 2 and a fan 3. Both ends of the cooling air pipeline 1 are connected to the inner cavity 110 of the motor 100. In this way, a cooling air loop is formed between the cooling air pipeline 1 and the inner cavity 110 of the motor 100. The fan 3 can provide power for the flow of gas in the cooling air loop. The cooling gas enters the inner cavity 110 of the motor 100 after heat exchange and cooling in the heat exchanger 2. The cooling gas exchanges heat with the motor 100 and takes away the heat in the motor 100, thereby cooling the motor 100. The gas after heat exchange with the motor 100 returns to the heat exchanger 2 for heat exchange and cooling. In the above process, the gas in the cooling air loop will not contact the outside air, and will not carry acidic and alkaline gases or salts in the outside air, thereby avoiding corrosion of the motor 100 by acidic and alkaline gases or salts, thereby improving the service life of the motor 100.

[0112] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A motor cooling system, characterized in that: The motor cooling system comprises a cooling air pipeline (1), a heat exchanger (2), a fan (3) and a controller; Both ends of the cooling air pipeline (1) are connected to the inner cavity (110) of the motor (100), and at least part of the cooling air pipeline (1) is connected to the heat exchanger (2) for heat exchange; The fan (3) is located on the cooling air pipeline (1); The controller is used to adjust the heat exchange amount of the heat exchanger (2) and the rotation speed of the fan (3).

2. The motor cooling system according to claim 1, characterized in that: The motor cooling system also includes an air supply device (4) and a pressure sensor (5); The gas supply device (4) is connected to the inner cavity (110) of the motor (100) and is used to inject gas into the inner cavity (110); The pressure sensor (5) is located in the inner cavity (110) and is used to detect the pressure value in the inner cavity (110) and send the pressure value to the controller; The controller is also used to control the air replenishing device (4) to operate based on the pressure value, so that the pressure value in the inner cavity (110) is in a positive pressure state.

3. The motor cooling system according to claim 2, characterized in that: The motor cooling system further comprises a first temperature sensor (6); The first temperature sensor (6) is located in the inner cavity (110) and is used to detect a first temperature of the inner cavity (110) and send the first temperature to a controller; The controller is also used to control the operation of the air supply device (4) based on the first temperature and the pressure value, and to adjust the heat exchange amount of the heat exchanger (2) and the rotation speed of the fan (3).

4. The motor cooling system according to claim 3, characterized in that: The motor cooling system further comprises a pressure relief pipeline (7), wherein the pressure relief pipeline (7) is in communication with the inner cavity (120); The controller is also used to control the operation of the pressure relief pipeline (7) based on the first temperature and the pressure value.

5. The motor cooling system according to any one of claims 1 to 4, characterized in that: The motor cooling system also includes a coolant pipeline (8) and a cooling device (9); The coolant pipeline (8) surrounds the outside of the stator (120) of the motor (100), the liquid outlet of the coolant pipeline (8) is connected to the inlet of the cooling device (9) through a first connecting pipeline (10), and the liquid inlet of the coolant pipeline (8) is connected to the outlet of the cooling device (9) through a second connecting pipeline (11).

6. The motor cooling system according to claim 5, characterized in that: The cooling device (9) comprises a compressor (91) and a condenser (92); The liquid outlet of the coolant pipeline (8) is connected to the inlet of the compressor (91) through the first connecting pipeline (10), the outlet of the compressor (91) is connected to the inlet of the condenser (92), and the outlet of the condenser (92) is connected to the liquid inlet of the coolant pipeline (8) through the second connecting pipeline (11).

7. The motor cooling system according to claim 5, characterized in that: The inlet of the heat exchanger (2) is connected to the outlet of the cooling device (9) via a third connecting pipe (12), and the outlet of the heat exchanger (2) is connected to the inlet of the cooling device (9).

8. The motor cooling system according to claim 7, characterized in that: When the motor cooling system includes a first temperature sensor (6), the motor cooling system further includes a second temperature sensor (13); The second temperature sensor (13) is located on the stator (120) and is used to detect a second temperature of the stator (120) and send the second temperature to a controller; The controller is also used to control the operation of the air supply device (4) based on the first temperature, the pressure value and the second temperature, and to adjust the heat exchange amount of the heat exchanger (2) and the rotation speed of the fan (3).

9. The motor cooling system according to claim 8, characterized in that: The motor cooling system further comprises a first flow valve (14) and a second flow valve (15); The first flow valve (14) is located on the third connecting pipeline (12), and the second flow valve (15) is located on the second connecting pipeline (11); The controller is further used to adjust the flow rate of the first flow valve (14) and the flow rate of the second flow valve (15) based on the first temperature and the second temperature.

10. An air compressor, characterized in that: The air compressor comprises a motor cooling system as described in any one of claims 1-9.

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