Integrated compressor motor cooling system and method

Abstract

The invention discloses an integrated compressor motor cooling system and method.The integrated compressor motor cooling system comprises a step cooling subsystem and a multi-stage adjusting subsystem, and the multi-stage adjusting subsystem is used for obtaining the motor winding temperature, the discharged refrigerant pressure and the discharged refrigerant temperature of a compressor; the exhaust superheat degree is calculated based on the exhaust refrigerant pressure and the exhaust refrigerant temperature, and a step cooling instruction is generated according to the motor winding temperature and the exhaust superheat degree; and the step cooling subsystem is used for adjusting the quantity of refrigerants conveyed to the compressor by the condenser or controlling the state of conveying the refrigerants to the compressor by the evaporator according to the step cooling instruction so as to carry out step cooling on a motor of the compressor. Liquid is accurately supplied according to the temperature of the motor, and liquid impact of the compressor caused by insufficient air return of the motor due to too much liquid supply and damage to the motor due to too little liquid supply are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to an integrated compressor motor cooling system and method. BACKGROUND

[0002] Centrifugal water chillers are widely used in commercial air conditioning systems, and centrifugal refrigeration compressors are the core equipment of centrifugal water chillers. Generally, the centrifugal refrigeration compressor is driven by a frequency converter. The traditional centrifugal refrigeration compressor adopts an independent structure of the compressor and the frequency converter. Generally, the centrifugal compressor is large in size, and the frequency converter is also large in size, which greatly increases the overall size of the centrifugal water chiller, and the land area and space occupied by the centrifugal water chiller are very large.

[0003] An integrated centrifugal compressor is a whole that integrates the compressor and the frequency converter, and the frequency converter control module is distributed in the compressor. Compared with the traditional compressor, the integrated centrifugal compressor has the advantages of compact structure, energy saving, low consumption, easy installation and maintenance, and small land occupation. In some places where the size of the compressor is obviously limited, the structural advantages are obvious. However, the integrated compressor generates a large amount of heat during motor operation, and the heat dissipation effect of the conventional compressor is limited, so the compressor cannot be cooled in time, and the heat accumulation will cause the temperature of the motor winding to rise and reduce the durability of the motor. In severe cases, the motor will be burned out and the compressor will not be able to work. However, the compressor motor cooling system often cannot cool accurately, resulting in high energy consumption, liquid over-supply causing liquid strike of the compressor, or insufficient liquid supply causing damage to the compressor. At the same time, most cooling systems have insufficient cooling effect in extreme high-temperature environments, resulting in damage to the compressor. SUMMARY

[0004] To solve the problems in the prior art, the present application provides an integrated compressor motor cooling system and method.

[0005] The present application adopts the following technical solutions.

[0006] The first aspect of the present application discloses an integrated compressor motor cooling system, comprising: a cascade cooling subsystem and a multi-stage regulation subsystem, the multi-stage regulation subsystem is used for obtaining the motor winding temperature, the discharge refrigerant pressure and the discharge refrigerant temperature of the compressor, and calculating the exhaust gas superheat degree based on the discharge refrigerant pressure and the discharge refrigerant temperature, and generating a cascade cooling instruction according to the motor winding temperature and the exhaust gas superheat degree;

[0007] The cascade cooling subsystem is used for adjusting the amount of liquid refrigerant delivered by the condenser to the compressor or controlling the state of the liquid refrigerant delivered by the evaporator to the compressor according to the cascade cooling instruction, so as to perform cascade cooling on the compressor motor.

[0008] Preferably, the multi-stage regulation subsystem comprises an exhaust pressure sensor, an exhaust temperature sensor and a motor winding temperature sensor, wherein the exhaust pressure sensor and the exhaust temperature sensor are installed on a connecting passage between the compressor exhaust port and the condenser input end to detect the discharge refrigerant pressure and the discharge refrigerant temperature of the compressor; the motor winding temperature sensor is installed on the motor winding of the compressor to detect the motor winding temperature of the compressor.

[0009] Preferably, the multi-stage regulation subsystem calculates the exhaust superheat degree based on the discharge refrigerant pressure and the discharge refrigerant temperature, comprising:

[0010] The exhaust saturation temperature is converted from the discharge refrigerant pressure, and the exhaust superheat degree is calculated by calculating the difference between the discharge refrigerant temperature and the exhaust saturation temperature.

[0011] Preferably, the step cooling instruction comprises a primary cooling instruction and a supplementary cooling instruction, wherein the primary cooling instruction is used to regulate the amount of liquid refrigerant delivered by the condenser to the compressor, and the supplementary cooling instruction is used to control the state of the liquid refrigerant delivered by the evaporator to the compressor.

[0012] Preferably, the primary cooling instruction is generated according to the motor winding temperature and the exhaust superheat degree, and the generation method comprises:

[0013] When TR≥TR4, the primary cooling instruction that increases the amount of liquid refrigerant delivered by the condenser to the compressor is generated;

[0014] When TR3

[0015] When TR1

[0016] When TR≤TR1, the primary cooling instruction that reduces the amount of liquid refrigerant delivered by the condenser to the compressor is generated;

[0017] When TR2≤TR≤TR3, the exhaust superheat degree T3 is analyzed:

[0018] When T3

[0019] When T3≥T30, the primary cooling instruction that keeps the amount of liquid refrigerant delivered by the condenser to the compressor unchanged is generated;

[0020] Wherein, TR is the motor winding temperature, TR1 and TR2 are preset first and second lower temperature thresholds, TR3 and TR4 are preset first and second upper temperature thresholds, T30 is a preset target exhaust superheat threshold, and TR1 < TR2 < TR3 < TR4.

[0021] Preferably, the supplemental cooling instruction is generated according to the motor winding temperature, and the generation manner comprises:

[0022] When TR ≥ TR5, a supplemental cooling instruction is generated, in which the evaporator delivers liquid refrigerant to the compressor;

[0023] When TR4 ≤ TR < TR5, a supplemental cooling instruction is generated, in which the state of the evaporator delivering liquid refrigerant to the compressor is unchanged;

[0024] When TR < TR4, a supplemental cooling instruction is generated, in which the evaporator stops delivering liquid refrigerant to the compressor;

[0025] Wherein, TR is the motor winding temperature, and TR4 and TR5 are preset second and third upper temperature thresholds.

[0026] Preferably, the cascade cooling subsystem comprises an electronic expansion valve and a refrigerant pump.

[0027] Wherein, the electronic expansion valve is arranged on a connecting path between the compressor inlet and the condenser outlet, and is used for adjusting the opening degree of the valve according to the cascade cooling instruction, so as to adjust the amount of liquid refrigerant input by the condenser to the compressor;

[0028] The refrigerant pump is arranged on a connecting path between the compressor inlet and the evaporator outlet, and is used for opening or closing the pump according to the cascade cooling instruction, so as to control the state of the evaporator delivering liquid refrigerant to the compressor.

[0029] The second aspect of the present application discloses a one-body integrated compressor motor cooling method, which is based on the system implementation, and the method comprises:

[0030] The motor winding temperature, the exhaust refrigerant pressure and the exhaust refrigerant temperature of the compressor are obtained, the exhaust superheat is calculated based on the exhaust refrigerant pressure and the exhaust refrigerant temperature, and the cascade cooling instruction is generated according to the motor winding temperature and the exhaust superheat;

[0031] The amount of liquid refrigerant delivered by the condenser to the compressor or the state of the evaporator delivering liquid refrigerant to the compressor is adjusted according to the cascade cooling instruction, so as to perform cascade cooling on the compressor motor.

[0032] The third aspect of the present application discloses an air conditioner comprising the one-body integrated compressor motor cooling system.

[0033] The fourth aspect of the present application discloses an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the computer program, when loaded into the processor, implements the method.

[0034] The fifth aspect of the present application discloses a computer readable storage medium, which stores a computer program, wherein the computer program, when executed by a processor, implements the method.

[0035] The present application has the beneficial effect that, compared with the prior art,

[0036] The present application obtains the motor winding temperature TR of the compressor, the discharge refrigerant pressure P1 and the discharge refrigerant temperature T1 through the multi-stage regulating subsystem, calculates the exhaust gas superheat T3 based on the discharge refrigerant pressure P1 and the discharge refrigerant temperature T1, and generates a step cooling instruction according to the motor winding temperature TR and the exhaust gas superheat T3; the step cooling subsystem adjusts the amount of refrigerant delivered by the condenser to the compressor or controls the state of the refrigerant delivered by the evaporator to the compressor according to the step cooling instruction, so as to perform step cooling on the compressor motor, accurately supply liquid according to the motor temperature, avoid insufficient compressor motor back gas caused by excessive liquid supply, and avoid damage to the motor caused by insufficient liquid supply.

[0037] The present application performs primary cooling by adjusting the amount of refrigerant delivered by the condenser to the compressor, and performs supplementary cooling by delivering refrigerant to the compressor through the evaporator, so as to realize double cooling, avoid damage caused by insufficient cooling energy efficiency of the compressor in an extreme high-temperature environment, and improve the cooling efficiency and applicability.

[0038] The present application solves the problem of over-temperature of the integrated integrated compressor motor, ensures safe and reliable operation of the unit, generates a step cooling instruction according to the motor winding temperature and the exhaust gas superheat; realizes on-demand liquid supply, avoids excessive refrigerant liquid extraction during cooling of the integrated integrated compressor motor, causes insufficient vaporization of the motor back gas into the compressor suction port, and causes the risk of liquid strike of the compressor back gas. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a system diagram of the integrated integrated compressor motor cooling system of the present application;

[0040] In the figure: 1. Compressor; 2. Evaporator; 3. Condenser; 4. Primary throttle valve; 5. Flasher; 6. Secondary throttle valve; 7. Electronic expansion valve; 8. Exhaust pressure sensor; 9. Exhaust temperature sensor; 10. Motor winding temperature sensor; 11. Refrigerant pump. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. The embodiments described in the present application are only a part of the embodiments of the present application, rather than all the embodiments. Based on the spirit of the present application, other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0042] As shown in Figure 1 The present application discloses an integrated compressor motor cooling system, which comprises: a cascade cooling subsystem and a multi-stage regulating subsystem. The multi-stage regulating subsystem is used to obtain the motor winding temperature TR of the compressor 1, the discharged refrigerant pressure P1 and the discharged refrigerant temperature T1, and calculate the exhaust gas superheat T3 based on the discharged refrigerant pressure P1 and the discharged refrigerant temperature T1, and generate the cascade cooling instruction according to the motor winding temperature TR and the exhaust gas superheat T3.

[0043] The cascade cooling subsystem is used to adjust the refrigerant amount delivered by the condenser 3 to the compressor 1 or control the state of the refrigerant delivered by the evaporator 2 to the compressor according to the cascade cooling instruction, so as to perform cascade cooling on the compressor motor.

[0044] The multi-stage regulating subsystem comprises an exhaust gas pressure sensor 8, an exhaust gas temperature sensor 9 and a motor winding temperature sensor 10. The exhaust gas pressure sensor 8 and the exhaust gas temperature sensor 9 are installed on the connecting passage between the exhaust port of the compressor 1 and the input end of the condenser 3, so as to detect the refrigerant pressure P1 and the discharged refrigerant temperature T1 of the compressor 1. The motor winding temperature sensor 10 is installed on the motor winding of the compressor 1, so as to detect the motor winding temperature TR of the compressor.

[0045] The multi-stage regulating subsystem converts the discharged refrigerant pressure P1 to obtain the exhaust gas saturation temperature T2, and obtains the exhaust gas superheat T3 by calculating the difference between the exhaust gas temperature T1 and the exhaust gas saturation temperature T2.

[0046] Preferably, the exhaust gas saturation temperature T2 can be obtained according to the pressure-saturation temperature corresponding table corresponding to the refrigerant type.

[0047] The cascade cooling instruction comprises a primary cooling instruction and a supplementary cooling instruction. The primary cooling instruction is used to adjust the refrigerant amount delivered by the condenser 3 to the compressor, and the supplementary cooling instruction is used to control the state of the refrigerant amount delivered by the evaporator 2 to the compressor.

[0048] The primary cooling instruction is generated according to the motor winding temperature TR and the exhaust gas superheat T3, and the generation mode comprises:

[0049] When TR≥TR4, a primary cooling instruction is generated to increase the amount of refrigerant delivered from the condenser 3 to the compressor;

[0050] When TR3

[0051] When TR1

[0052] When TR≤TR1, a primary cooling instruction is generated to decrease the amount of refrigerant delivered from the condenser 3 to the compressor;

[0053] When TR2≤TR≤TR3, T3 is analyzed:

[0054] When T3

[0055] When T3≥T30, a primary cooling instruction is generated to keep the amount of refrigerant delivered from the condenser 3 to the compressor unchanged;

[0056] Wherein, TR1, TR2 are preset first and second lower temperature thresholds, TR3, TR4 are preset first and second upper temperature thresholds, and T30 is a preset target exhaust gas superheat threshold.

[0057] The supplementary cooling instruction is generated according to the motor winding temperature TR, and the generation method includes:

[0058] When TR≥TR5, a supplementary cooling instruction is generated to deliver refrigerant from the evaporator 2 to the compressor;

[0059] When TR4≤TR

[0060] When TR

[0061] Wherein, TR4, TR5 are preset second and third upper temperature thresholds.

[0062] At the same time, TR1

[0063] The cascade cooling subsystem includes an electronic expansion valve 7 and a refrigerant pump 11;

[0064] Wherein, the electronic expansion valve 7 is arranged on the connecting path between the inlet of the compressor 1 and the output end of the condenser 3, and is used to adjust the opening degree D of the valve according to the cascade cooling instruction, so as to adjust the amount of refrigerant input from the condenser 3 to the compressor 1;

[0065] The refrigerant pump 11 is arranged on a connecting path between the suction port of the compressor 1 and the output end of the evaporator 2, and is used to open or close the pump according to the cascade cooling instruction, so as to control the state of the refrigerant delivered from the evaporator 2 to the compressor, and the heat-absorbed and vaporized refrigerant is returned to the suction port of the compressor to participate in the circulation, thereby simplifying the cooling pipeline, improving the energy utilization rate and the applicability of the compressor.

[0066] The compressor 1, the condenser 3, the primary throttle valve 4 and the flash evaporator 5 are sequentially connected through pipelines, the flash evaporator 5 is connected with the compressor 1 through one path, and is sequentially connected with the compressor 1 through the secondary throttle valve 6 and the evaporator 2 through another path, so as to form a circulation loop.

[0067] In the specific embodiment, the refrigerant output from the compressor 1 is sequentially passed through the condenser 3 and the primary throttle valve 4, is separated in the flash evaporator 5, is directly returned to the compressor 1 as gaseous refrigerant to perform air charging of the compressor 1, improves the compression efficiency, is reduced in pressure through the secondary throttle valve 6 to form low-temperature and low-pressure liquid refrigerant, is introduced into the evaporator 2 to be evaporated into gaseous refrigerant by absorbing heat, and is returned to the compressor 1, so as to complete the circulation of the refrigerant.

[0068] The application further discloses a one-body integrated compressor motor cooling method based on the system.

[0069] The motor winding temperature TR of the compressor, the discharged refrigerant pressure P1 and the discharged refrigerant temperature T1 are acquired, the exhaust superheat T3 is calculated based on the discharged refrigerant pressure P1 and the discharged refrigerant temperature T1, and the cascade cooling instruction is generated according to the motor winding temperature TR and the exhaust superheat T3.

[0070] The refrigerant amount delivered from the condenser 3 to the compressor or the state of the refrigerant delivered from the evaporator 2 to the compressor is adjusted or controlled according to the cascade cooling instruction, so as to perform cascade cooling on the compressor motor.

[0071] The application further discloses an air conditioner comprising the one-body integrated compressor motor cooling system.

[0072] The application further discloses an electronic device comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, and the computer program is loaded into the processor to realize the method.

[0073] The application further discloses a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to realize the method.

[0074] Compared with the prior art, the application has the advantages that

[0075] The application solves the problem of over-temperature of the integrated compressor motor, ensures safe and reliable operation of the unit, realizes on-demand liquid supply through multiple sets of temperature data, and avoids the risk of liquid knock of the compressor caused by insufficient vaporization of the motor back gas entering the compressor suction port when the integrated compressor motor cooling is easy to cause excessive refrigerant liquid extraction.

[0076] The application obtains the motor winding temperature TR of the compressor, the discharged refrigerant pressure P1 and the discharged refrigerant temperature T1 through the multi-stage regulation subsystem, calculates the exhaust gas superheat T3 based on the discharged refrigerant pressure P1 and the discharged refrigerant temperature T1, and generates a step cooling instruction according to the motor winding temperature TR and the exhaust gas superheat T3; the step cooling subsystem adjusts the amount of refrigerant delivered by the condenser to the compressor or controls the state of the refrigerant delivered by the evaporator to the compressor according to the step cooling instruction, so as to perform step cooling on the compressor motor, realize accurate liquid supply according to the motor temperature, avoid the risk of liquid knock of the compressor caused by insufficient vaporization of the motor back gas entering the compressor suction port when the integrated compressor motor cooling is easy to cause excessive refrigerant liquid extraction, and avoid damage to the motor caused by insufficient liquid supply.

[0077] The application performs primary cooling by adjusting the amount of refrigerant delivered by the condenser to the compressor, and performs supplementary cooling by delivering refrigerant to the compressor through the evaporator, so as to realize double cooling, avoid damage caused by insufficient cooling efficiency of the compressor in an extreme high-temperature environment, and improve the cooling efficiency and applicability.

[0078] The present disclosure can be a system, a method, and / or a computer program product. The computer program product can include a computer readable storage medium (or media) having computer readable program instructions thereon for causing a processor to carry out aspects of the present disclosure.

[0079] The computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer readable storage medium can be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or punched-tape, and any suitable combination of the foregoing. A computer readable storage medium, as used herein, is not to be construed as being transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media (e.g., light pulses passing through a fiber-optic cable), or electrical signals transmitted through a wire.

[0080] Computer readable program instructions described herein can be downloaded to respective computing / processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and / or a wireless network. The network can comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and / or edge servers. A network adapter card or network interface in each computing / processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing / processing device.

[0081] Computer readable program instructions for carrying out operations of the present disclosure can be assembly instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C++ or the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions can execute entirely on the user's computing device, partly on the user's computing device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device or entirely on the remote computing device or server. In the latter scenario, the remote computing device can be connected to the user's computing device through any kind of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computing device, for example, through the Internet using an Internet Service Provider. In some embodiments, electronic circuitry including, for example, programmable logic circuitry, field-programmable gate arrays (FPGA), or programmable logic arrays (PLA) can execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of the present disclosure.

[0082] Finally, it should be noted that the above-mentioned embodiments are merely intended for describing and illustrating, but not limiting the technical solutions of the present application. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered within the protection scope of the claims of the present application.

Claims

1. An integrated compressor motor cooling system, comprising: The step cooling subsystem and the multi-stage regulation subsystem are characterized in that: The multi-stage regulation subsystem is used to acquire the motor winding temperature of the compressor, the discharge refrigerant pressure and the discharge refrigerant temperature, and calculate the exhaust gas superheat degree based on the discharge refrigerant pressure and the discharge refrigerant temperature, and generate the step cooling instruction according to the motor winding temperature and the exhaust gas superheat degree; The step cooling subsystem is used to adjust the amount of liquid refrigerant delivered by the condenser to the compressor or control the state of the liquid refrigerant delivered by the evaporator to the compressor according to the step cooling instruction, so as to perform step cooling on the motor of the compressor.

2. The integrated compressor motor cooling system according to claim 1, characterized in that: The multi-stage regulation subsystem comprises an exhaust gas pressure sensor, an exhaust gas temperature sensor and a motor winding temperature sensor, wherein the exhaust gas pressure sensor and the exhaust gas temperature sensor are installed on the connecting passage between the compressor discharge port and the condenser input end to detect the discharge refrigerant pressure and the discharge refrigerant temperature of the compressor; and the motor winding temperature sensor is installed on the motor winding of the compressor to detect the motor winding temperature of the compressor.

3. The integrated compressor motor cooling system according to claim 1, characterized in that: The multi-stage regulation subsystem calculates the exhaust gas superheat degree based on the discharge refrigerant pressure and the discharge refrigerant temperature, comprising: The exhaust gas saturation temperature is calculated based on the discharge refrigerant pressure, and the exhaust gas superheat degree is calculated by the difference between the discharge refrigerant temperature and the exhaust gas saturation temperature.

4. The integrated compressor motor cooling system according to claim 1, characterized in that: The step cooling instruction comprises a primary cooling instruction and a supplementary cooling instruction, wherein the primary cooling instruction is used to adjust the amount of liquid refrigerant delivered by the condenser to the compressor, and the supplementary cooling instruction is used to control the state of the liquid refrigerant delivered by the evaporator to the compressor.

5. The integrated compressor motor cooling system according to claim 4, characterized in that: The primary cooling instruction is generated according to the motor winding temperature and the exhaust gas superheat degree, and the generation method comprises: When TR≥TR4, the primary cooling instruction for increasing the amount of liquid refrigerant delivered by the condenser to the compressor is generated; When TR3 When TR1 When TR2 When TR≤TR1, the primary cooling instruction for reducing the amount of liquid refrigerant delivered by the condenser to the compressor is generated; When TR2≤TR≤TR3, the exhaust gas superheat degree T3 is analyzed: When T3 When T3≥T30, the primary cooling instruction for keeping the amount of liquid refrigerant delivered by the condenser to the compressor unchanged is generated; Wherein, TR is the motor winding temperature, TR1 and TR2 are the first and second lower temperature thresholds, TR3 and TR4 are the first and second upper temperature thresholds, and T30 is the preset target exhaust gas superheat degree threshold, and TR1 6. The integrated compressor motor cooling system of claim 4, wherein: the supplemental cooling instruction is generated according to the motor winding temperature, and the generation includes: when TR≥TR5, generating a supplemental cooling instruction that the evaporator delivers liquid refrigerant to the compressor; when TR4≤TR<TR5, generating a supplemental cooling instruction that controls the evaporator to keep the state unchanged of delivering liquid refrigerant to the compressor; when TR<TR4, generating a supplemental cooling instruction that the evaporator stops delivering liquid refrigerant to the compressor; wherein TR is the motor winding temperature, and TR4 and TR5 are preset second and third upper temperature thresholds.

7. The integrated compressor motor cooling system of claim 1, wherein: the cascade cooling subsystem includes an electronic expansion valve and a refrigerant pump; the electronic expansion valve is arranged on a connecting path between the compressor suction port and the condenser output end, and is used to adjust the opening of the valve according to the cascade cooling instruction, so as to adjust the amount of liquid refrigerant input from the condenser to the compressor; the refrigerant pump is arranged on a connecting path between the compressor suction port and the evaporator output end, and is used to open or close the pump according to the cascade cooling instruction, so as to control the state of the evaporator delivering liquid refrigerant to the compressor.

8. A method of cooling an integrated compressor motor, implemented based on the system of any one of claims 1-7, characterized in that, the method includes: obtaining the motor winding temperature, the discharge refrigerant pressure and the discharge refrigerant temperature of the compressor, and calculating the exhaust superheat degree based on the discharge refrigerant pressure and the discharge refrigerant temperature, and generating the cascade cooling instruction according to the motor winding temperature and the exhaust superheat degree; adjusting the amount of liquid refrigerant delivered from the condenser to the compressor or controlling the state of the evaporator delivering liquid refrigerant to the compressor according to the cascade cooling instruction, so as to cascade cool the compressor motor.

9. An air conditioner characterized by comprising: an integrated compressor motor cooling system according to any one of claims 1 to 7.

10. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, the computer program is loaded into the processor to implement the method of claim 8.

11. A computer-readable storage medium storing a computer program, wherein the computer program comprises the following steps of: receiving a request for a resource from a client; determining whether the client is authorized to access the resource; and if the client is authorized to access the resource, providing the resource to the client. the computer program is executed by the processor to implement the method of claim 8. the computer program is loaded into the processor to implement the method of claim 8. the computer program is executed by the processor to implement the method of claim 8.

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