Method and device for magnetic levitation compressor cooling, magnetic levitation air conditioner

Abstract

The application relates to the technical field of air conditioners, and discloses a method for cooling a magnetic suspension compressor, the magnetic suspension compressor being applied to an air conditioner, wherein a cooling outlet and a cooling inlet are arranged on the magnetic suspension compressor; the cooling inlet is connected with an outlet end of a condenser through a cooling pipeline, and a throttling element is arranged on the cooling pipeline; the method comprises the following steps: acquiring a real-time temperature of refrigerant of the cooling outlet; in the case that the real-time temperature is greater than a temperature threshold value, determining a first adjustment scheme of the throttling element according to a pressure ratio of the magnetic suspension air conditioner and a temperature change rate of the refrigerant of the cooling outlet; and controlling the throttling element to execute the first adjustment scheme. The method can improve the detection precision by collecting the temperature outside the compressor. And the opening degree of the throttling element can be adjusted in a timely manner according to the detection parameters, so that sufficient cooling in the compressor cavity is realized. The application further discloses a device for cooling a magnetic suspension compressor, a magnetic suspension air conditioner and a storage medium.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, such as a method, apparatus, magnetic levitation air conditioner, and storage medium for cooling a magnetic levitation compressor. Background Technology

[0002] Currently, the compressors in central air conditioning chiller units are generally magnetic levitation compressors. During operation, the compressor motor rotates at high speed, causing the motor temperature to rise and affecting other components of the compressor. Typically, a portion of the refrigerant discharged from the compressor is throttled and sent to the compressor cooling inlet, where the low-temperature, low-pressure liquid refrigerant cools the compressor motor.

[0003] The related technologies disclose the real-time acquisition of pressure and temperature in the sealed chamber at the rear end of the compressor, as well as the temperature of the rear stator winding, stator core, and front stator winding of the compressor, through pressure and temperature sensors; real-time monitoring of the temperature and pressure inside the motor, and cooling the motor at any time; ensuring that the refrigerant in the motor cavity is in a saturated or slightly overheated state.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] In related technologies, the sensor is placed inside the compressor cavity. The high temperature inside the cavity can cause the sensor's resistance to drift, resulting in inaccurate sensor readings. This, in turn, leads to untimely and insufficient cooling of the compressor. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a method, apparatus, magnetic levitation air conditioner, and storage medium for cooling a magnetic levitation compressor, thereby eliminating the influence of high temperature inside the compressor cavity on the sensor resistance and achieving sufficient cooling of the compressor cavity.

[0008] In some embodiments, the magnetic levitation compressor is provided with a cooling outlet and a cooling inlet; the cooling inlet is connected to the outlet end of the condenser through a cooling pipe, and a throttling element is provided on the cooling pipe; the method includes: obtaining the real-time temperature of the refrigerant at the cooling outlet; when the real-time temperature is greater than a temperature threshold, determining a first adjustment scheme for the throttling element based on the pressure ratio of the magnetic levitation air conditioning system and the temperature change rate of the refrigerant at the cooling outlet; and controlling the throttling element to execute the first adjustment scheme.

[0009] In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to, when executing the program instructions, perform the aforementioned method for cooling a magnetically levitated compressor.

[0010] In some embodiments, the magnetic levitation air conditioner includes: a cooling inlet and a cooling outlet, both disposed on the magnetic levitation compressor; and, as described above, a device for cooling the magnetic levitation air conditioner compressor; wherein the cooling inlet is connected to the outlet end of the condenser via a cooling pipe, and the cooling pipe is provided with a throttling element; the cooling outlet is connected to the inlet end of the evaporator via a first branch, and to the return port of the compressor via a second branch; a first control valve and a second control valve are respectively disposed on the first branch and the second branch.

[0011] In some embodiments, the storage medium stores program instructions that, when executed, perform the aforementioned method for cooling a magnetically levitated compressor.

[0012] The method, apparatus, magnetic levitation air conditioner, and storage medium for cooling a magnetic levitation compressor provided in this disclosure can achieve the following technical effects:

[0013] The real-time temperature of the refrigerant at the compressor cooling outlet is detected. When the real-time temperature exceeds a temperature threshold, the opening of the throttling element is adjusted based on the real-time temperature of the refrigerant, the rate of temperature change, and the pressure ratio of the air conditioning system. This controls the flow rate of the refrigerant into the compressor cavity through the cooling inlet. In this embodiment, the temperature outside the compressor is collected. This improves the accuracy of the detection and, since the detected refrigerant is the temperature of multiple components flowing through the cavity, it can more accurately reflect the internal temperature. Thus, the opening of the throttling element can be adjusted promptly based on the detected parameters to achieve sufficient cooling inside the compressor cavity.

[0014] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0016] Figure 1 This is a schematic diagram of the structure of a magnetic levitation air conditioner provided in an embodiment of this disclosure;

[0017] Figure 2 This is a schematic diagram of a method for cooling a magnetically levitated compressor provided in an embodiment of this disclosure;

[0018] Figure 3This is a schematic diagram of another method for cooling a magnetically levitated compressor provided in an embodiment of this disclosure;

[0019] Figure 4 This is a schematic diagram of another method for cooling a magnetically levitated compressor provided in an embodiment of this disclosure;

[0020] Figure 5 This is a schematic diagram of another method for cooling a magnetically levitated compressor provided in an embodiment of this disclosure;

[0021] Figure 6 This is a schematic diagram of a device for cooling a magnetic levitation compressor provided in an embodiment of this disclosure.

[0022] Figure label:

[0023] 10: Compressor; 20: Condenser; 30: Evaporator; 40: Electronic expansion valve; 11: Throttling element; 12: First control valve; 13: Second control valve; 21: First branch; 22: Second branch; 51: Temperature sensor; 52: Pressure sensor; A: Cooling inlet; B: Cooling outlet. Detailed Implementation

[0024] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0025] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0026] Unless otherwise stated, the term "multiple" means two or more.

[0027] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0028] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0029] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0030] Combination Figure 1 The magnetic levitation air conditioning system includes a compressor 10, a condenser 20, an electronic expansion valve 40, and an evaporator 30. The high-temperature, high-pressure refrigerant discharged from the compressor 10 flows into the condenser 20 via a pipeline, then is throttled and cooled by the electronic expansion valve 40 before flowing into the evaporator 30, and finally returns to the compressor 10. The compressor 10 has a cooling inlet A and a cooling outlet B. The cooling inlet A is connected to the outlet end of the condenser 20 via a cooling pipeline, and a throttling element 11 is installed on the cooling pipeline. By adjusting the opening of the throttling element 11, the amount of refrigerant flowing into the compressor cooling inlet A can be adjusted to regulate the temperature inside the compressor 10. The cooling outlet B is connected to the inlet end of the evaporator 30 via a first branch 21, and a first control valve 12 is installed on the first branch 21.

[0031] Optionally, cooling outlet B is also connected to the return port of compressor 10 via a second branch 22, and a second control valve 13 is provided on the second branch 22. During operation of the magnetic levitation air conditioning system, the first control valve 12 and the second control valve 13 remain in an open-closed state. When the first control valve 12 is closed and the second control valve 13 is open, the refrigerant flowing from cooling outlet B of compressor 10 flows directly into the compressor's suction port via the second branch 22. This can increase the compressor's suction volume.

[0032] Optionally, a temperature sensor 51 is installed on the pipe of cooling outlet B to collect the real-time temperature of the refrigerant at cooling outlet B. Pressure sensors 52 are respectively installed on the evaporator 30 and the condenser 20 to collect the pressure of the evaporator and the condenser.

[0033] In this embodiment, the temperature sensor is externally mounted, avoiding the influence of high-temperature sensor resistance and resulting in more accurate measurements. Furthermore, the monitored temperature is the temperature of the refrigerant after it has flowed through multiple components within the compressor cavity, providing a more accurate reflection of the internal temperature. Thus, by monitoring the outlet temperature of the refrigerant after it has flowed through the compressor cavity, the refrigerant flow rate at the cooling inlet can be controlled, leading to more precise control.

[0034] Combination Figure 2 As shown, this disclosure provides a method for cooling a magnetic levitation compressor, comprising:

[0035] S101, the processor obtains the real-time temperature of the refrigerant at the cooling outlet.

[0036] S102, when the real-time temperature is greater than the temperature threshold, the processor determines the first adjustment scheme of the throttling element based on the pressure ratio of the magnetic levitation air conditioning system and the temperature change rate of the refrigerant at the cooling outlet.

[0037] S103, the processor controls the throttling element to execute the first regulation scheme.

[0038] Here, the temperature of the refrigerant at the cooling outlet is monitored in real time by a temperature sensor on the cooling outlet pipe. Simultaneously, the rate of change of the refrigerant temperature at the cooling outlet can be calculated based on the detected temperature. Specifically, the rate of change of the refrigerant temperature at the cooling outlet is ΔT = (T2 - T1) / Δt, where T2 is the temperature detected at the current moment, T1 is the temperature detected at the previous moment, and Δt is the time interval between the two measurements, ranging from 2 to 5 seconds.

[0039] The relationship between the detected real-time temperature and the temperature threshold is determined. If the real-time temperature of the refrigerant at the cooling outlet is greater than the temperature threshold, it indicates that the compressor's internal temperature is high. The opening of the throttling element needs to be increased to increase the amount of refrigerant flowing into the cooling inlet. Specifically, based on the pressure ratio of the magnetic levitation air conditioning system and the rate of change of the refrigerant temperature at the cooling outlet, the first adjustment scheme for the throttling element is determined. Here, the pressure ratio of the air conditioning system refers to the external pressure ratio, i.e., the ratio of the condenser pressure to the evaporator pressure. The pressure ratio of the magnetic levitation air conditioning system is related to the amount of refrigerant flowing into the compressor's cooling inlet. Generally, the higher the pressure ratio of the air conditioning system, the greater the amount of refrigerant flowing into the compressor's cooling inlet. A higher rate of temperature change indicates a greater refrigerant demand. Therefore, based on the pressure ratio and temperature change rate of the air conditioning system, the opening adjustment scheme of the throttling element is determined.

[0040] As an example, the higher the pressure ratio of the air conditioning system, the slower the adjustment range or rate of the throttling element's opening. Conversely, the faster the temperature change rate, the faster the adjustment range or rate of the throttling element's opening. The correspondence between the air conditioning system's pressure ratio, temperature change rate, and throttling element adjustment scheme is established. Based on the pressure ratio and temperature change rate, the corresponding adjustment range or rate of the throttling element is determined, and then the average value is calculated as the throttling element's opening adjustment scheme. Alternatively, different weights can be assigned, and the weighted average value is used as the throttling element's opening adjustment scheme.

[0041] The method for cooling a magnetic levitation compressor provided in this disclosure detects the real-time temperature of the refrigerant at the compressor cooling outlet. When the real-time temperature exceeds a temperature threshold, the opening of the throttling element is adjusted based on the real-time temperature of the refrigerant, the rate of temperature change, and the pressure ratio of the air conditioning system. This controls the flow rate of the refrigerant flowing into the compressor cavity through the cooling inlet. This disclosure also collects the temperature outside the compressor. This improves the accuracy of the detection, and since the detected refrigerant is the temperature of multiple components flowing through the cavity, it can more accurately reflect the internal temperature. Therefore, the opening of the throttling element can be adjusted promptly based on the detected parameters to achieve sufficient cooling within the compressor cavity.

[0042] Optionally, in step S102, the processor determines the pressure ratio of the magnetic levitation air conditioner in the following manner:

[0043] The processor obtains the pressure of the condenser and evaporator of the magnetic levitation air conditioner.

[0044] The processor calculates P = (Pc + 101.325) / (Pe + 101.325); where P is the pressure ratio, Pc is the pressure of the condenser, and Pe is the pressure of the evaporator.

[0045] Here, pressure sensors installed on the condenser and evaporator detect the refrigerant pressure in the condenser and evaporator, respectively. The detected pressure values ​​are relative pressures, which are converted to absolute pressures and then used to calculate the pressure ratio of the magnetic levitation air conditioner.

[0046] Optionally, in step S102, the processor determines a first adjustment scheme for the throttling element based on the pressure ratio of the magnetic levitation air conditioning system and the rate of change of the refrigerant temperature at the cooling outlet, including:

[0047] When the pressure ratio of the magnetic levitation air conditioner is greater than or equal to the pressure ratio threshold, if the rate of change of the refrigerant temperature at the cooling outlet is greater than or equal to the first rate of change, the processor determines that the throttling element should be increased at the first rate; otherwise, the processor determines that the throttling element should be increased at the second rate.

[0048] If the pressure ratio of the magnetic levitation air conditioner is less than the pressure ratio threshold, and the rate of change of the refrigerant temperature at the cooling outlet is greater than or equal to the first rate of change, the processor determines that the throttling element should be increased at the third rate; otherwise, the processor determines that the throttling element should be increased at the first rate.

[0049] Among them, the third speed is greater than the first speed, and the first speed is greater than the second speed.

[0050] Here, we first determine the pressure ratio of the magnetic levitation air conditioner and its relationship to a preset pressure ratio threshold. The pressure ratio threshold can be determined based on the air conditioning system model or its operating conditions; for example, it could be 1.4. If the pressure ratio of the magnetic levitation air conditioner is greater than or equal to the pressure ratio threshold, it indicates that the adjustment range of the throttling element is relatively small, such as an adjustment rate range of 0.5%-1% per second. If the pressure ratio of the magnetic levitation air conditioner is less than the pressure ratio threshold, it indicates that the adjustment range of the throttling element is relatively large, such as an adjustment rate range of 1%-2% per second. Thus, the adjustment rate range of the throttling element can be initially determined based on the pressure ratio, and then the adjustment rate of the throttling element can be determined based on the refrigerant change rate at the cooling outlet.

[0051] Specifically, when the pressure ratio of the magnetic levitation air conditioner is greater than or equal to the pressure ratio threshold, if the rate of change of the refrigerant temperature at the cooling outlet is greater than or equal to a first rate of change, then the throttling element is adjusted to a larger opening rate (first rate). The first rate of change can be 1℃ / s, and the first speed can be 1% / s (i.e., the opening of the throttling element increases by 1% per second). If the rate of change of the refrigerant temperature at the cooling outlet is less than the first rate of change, then the throttling element is adjusted to a smaller opening rate (second rate). The second speed can be 0.5% / s.

[0052] When the pressure ratio of the magnetic levitation air conditioner is less than the pressure ratio threshold, if the rate of change of the refrigerant temperature at the cooling outlet is greater than or equal to the first rate of change, the throttling element is adjusted to a larger opening rate (third rate). The third rate, being greater than the first rate, can be taken as 2% / s. If the rate of change of the refrigerant temperature at the cooling outlet is less than the first rate of change, the throttling element is adjusted to a smaller opening rate (fourth rate). The fourth rate, being greater than or equal to the first rate, can be taken as 1% / s. Thus, for different operating conditions, the throttling element is adjusted at different rates to ensure that the amount of refrigerant flowing into the cooling inlet can adequately cool the temperature inside the compressor cavity.

[0053] Combination Figure 3 As shown, this disclosure provides another method for cooling a magnetically levitated compressor, comprising:

[0054] S101, the processor obtains the real-time temperature of the refrigerant at the cooling outlet.

[0055] S102, when the real-time temperature is greater than the temperature threshold, the processor determines the first adjustment scheme of the throttling element based on the pressure ratio of the magnetic levitation air conditioning system and the temperature change rate of the refrigerant at the cooling outlet.

[0056] S103, the processor controls the throttling element to execute the first regulation scheme.

[0057] S204, when the real-time temperature is less than the temperature threshold, the processor determines the second adjustment scheme of the throttling element based on the temperature change rate of the refrigerant at the cooling outlet.

[0058] S205, the processor controls the throttling element to execute the second regulation scheme.

[0059] Here, when the refrigerant temperature at the cooling outlet is lower than the temperature threshold, it indicates that the temperature inside the compressor cavity is low. The opening of the throttling element needs to be reduced to appropriately increase the temperature inside the compressor cavity and prevent the compressor temperature from becoming too low. In this case, the amount of refrigerant flowing into the cooling inlet depends on the rate of change of the refrigerant temperature at the cooling outlet. Therefore, in this embodiment, a second adjustment scheme for the throttling element is determined based on the rate of change of the refrigerant temperature at the cooling outlet. Specifically, the greater the rate of change of the refrigerant temperature at the cooling outlet, the greater the magnitude or rate at which the throttling element is reduced.

[0060] Optionally, in step S204, the processor determines a second adjustment scheme for the throttling element based on the rate of change of the refrigerant temperature at the cooling outlet, including:

[0061] If the rate of change of refrigerant temperature at the cooling outlet is greater than or equal to the second rate of change, the processor determines that the throttling element should reduce its opening at the fifth rate.

[0062] If the rate of change of refrigerant temperature at the cooling outlet is less than the second rate of change, the processor determines that the throttling element should reduce its opening at the sixth rate.

[0063] The fifth rate is greater than the sixth rate.

[0064] Here, the second rate of change is less than the first rate of change, and can be taken as 0.5℃ / s. If the rate of change of the refrigerant temperature at the cooling outlet (temperature decrease rate) is greater than or equal to the second rate of change, it indicates that the temperature inside the compressor cavity is decreasing rapidly. At this time, the rate at which the throttling element decreases is also relatively fast (the fifth rate). The fifth rate is less than or equal to the second rate. The fifth rate can be taken as 0.5% / s. If the rate of change of the refrigerant temperature at the cooling outlet is less than the second rate of change, it indicates that the temperature inside the compressor cavity is decreasing slowly. At this time, the rate at which the throttling element decreases is also relatively slow (the sixth rate). The sixth rate is less than the fifth rate. The fifth rate can be taken as 0.2% / s. Thus, when reducing the opening of the throttling element, the adjustment is made at a relatively small rate. This avoids excessive adjustment amplitude, which could cause large temperature fluctuations inside the compressor cavity and result in excessively high temperatures inside the compressor cavity.

[0065] Combination Figure 4 As shown, this disclosure provides another method for cooling a magnetically levitated compressor, comprising:

[0066] S101, the processor obtains the real-time temperature of the refrigerant at the cooling outlet.

[0067] S102, when the real-time temperature is greater than the temperature threshold, the processor determines the first adjustment scheme of the throttling element based on the pressure ratio of the magnetic levitation air conditioning system and the temperature change rate of the refrigerant at the cooling outlet.

[0068] S103, the processor controls the throttling element to execute the first regulation scheme.

[0069] S304, the processor obtains the compressor's exhaust superheat;

[0070] S305, the processor controls the on / off state of the first control valve and the second control valve based on the exhaust superheat.

[0071] Here, the refrigerant at the cooling outlet has two flow paths. Path one involves flowing into the evaporator via the first control valve for heat exchange and then returning to the compressor. Path two involves flowing back to the compressor via the second control valve. When the refrigerant flows back to the compressor via the second control valve, if this portion of the refrigerant cannot absorb all the heat and become gaseous within the compressor chamber, it will result in liquid carrying over the refrigerant returning to the compressor. This will affect the compressor's performance and may even damage it. Therefore, it is necessary to rationally select the refrigerant flow path at the cooling outlet based on the operating conditions of the magnetic levitation air conditioning system. Specifically, the refrigerant temperature at the compressor discharge port is detected by a temperature sensor, and the compressor's discharge superheat is obtained based on this detected value and the corresponding saturation temperature. Based on the compressor's discharge superheat, the corresponding refrigerant flow path at the cooling outlet is determined, thereby controlling the corresponding states of the first and second control valves.

[0072] Optionally, in step S305, the processor controls the on / off state of the first control valve and the second control valve based on the exhaust superheat, including:

[0073] When the exhaust superheat is less than or equal to the superheat threshold, the processor controls the first control valve to open and the second control valve to close.

[0074] When the exhaust superheat exceeds the superheat threshold, the processor controls the first control valve to close and the second control valve to open.

[0075] Here, a superheat threshold is set to define the magnitude of the exhaust superheat. If the compressor's exhaust superheat is less than or equal to the superheat threshold, it indicates a risk of liquid slugging if the refrigerant at the cooling outlet flows directly back to the compressor via the second control valve. Therefore, in this case, the first control valve is opened and the second control valve is closed to prevent liquid from being carried into the compressor intake. If the compressor's exhaust superheat is greater than the superheat threshold, it indicates a higher temperature inside the compressor cavity, allowing the refrigerant at the cooling outlet to be fully converted into gaseous refrigerant. In this case, the first control valve is closed and the second control valve is opened. It should also be noted that the default state of the first control valve is open, and the default state of the second control valve is closed.

[0076] Combination Figure 5 As shown, this disclosure provides another method for cooling a magnetically levitated compressor, comprising:

[0077] S501, the magnetic levitation air conditioner is started and running;

[0078] S502, obtains the real-time temperature and temperature change rate of the refrigerant at the compressor cooling outlet;

[0079] S503, determine whether the real-time temperature T of the refrigerant is greater than the temperature threshold Ts (i.e., T > Ts). If yes, execute S504; otherwise, execute S512.

[0080] S504, obtain the pressure ratio P of the magnetic levitation air conditioning system;

[0081] S505, determine whether the pressure ratio is greater than or equal to the pressure ratio threshold Ps (i.e., P≥Ps). If yes, proceed to S506; otherwise, proceed to S509.

[0082] S506, determine whether the temperature change rate ΔT is greater than or equal to the first change rate ΔT1 (i.e. ΔT≥ΔT1). If yes, proceed to S507; otherwise, proceed to S508.

[0083] S507, control the throttling element to increase the opening at a first rate; then execute S502;

[0084] S508, control the throttling element to increase the opening at the second rate; then execute S502;

[0085] S509, determine whether the temperature change rate ΔT is greater than or equal to the first change rate ΔT1 (i.e. ΔT≥ΔT1). If yes, execute S510; otherwise, execute S511.

[0086] S510, control the throttling element to increase the opening at the third rate; then execute S502;

[0087] S511, control the throttling element to increase the opening at the fourth rate; then execute S502;

[0088] S512, determine whether the temperature change rate ΔT is greater than or equal to the second change rate ΔT2 (i.e. ΔT≥ΔT2). If yes, execute S513; otherwise, execute S514.

[0089] S513, control the throttling element to reduce the opening at the fifth rate; then execute S502;

[0090] S514, control the throttling element to reduce the opening at the sixth rate; then execute S502.

[0091] This disclosure provides an apparatus for cooling a magnetic levitation compressor, including an acquisition module, a determination module, and a control module. The acquisition module is configured to acquire the real-time temperature of the refrigerant at the cooling outlet; the determination module is configured to determine a first adjustment scheme for the throttling element based on the pressure ratio of the magnetic levitation air conditioner and the temperature change rate of the refrigerant at the cooling outlet when the real-time temperature is greater than a temperature threshold; the control module is configured to control the throttling element to execute the first adjustment scheme.

[0092] The device for cooling a magnetic levitation compressor provided in this disclosure detects the real-time temperature of the refrigerant at the compressor cooling outlet. When the real-time temperature exceeds a temperature threshold, the opening of the throttling element is adjusted based on the real-time temperature of the refrigerant, the rate of temperature change, and the pressure ratio of the air conditioning system. This controls the flow rate of the refrigerant flowing into the compressor cavity through the cooling inlet. This disclosure also collects the temperature outside the compressor. This improves the accuracy of the detection, and since the detected refrigerant is the temperature of multiple components flowing through the cavity, it can accurately reflect the internal temperature. Therefore, the opening of the throttling element can be adjusted promptly based on the detected parameters to achieve sufficient cooling inside the compressor.

[0093] Combination Figure 6 As shown, this disclosure provides an apparatus for cooling a magnetic levitation compressor, including a processor 100 and a memory 101. Optionally, the apparatus may further include a communication interface 102 and a bus 103. The processor 100, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call logical instructions stored in the memory 101 to execute the method for cooling a magnetic levitation compressor described in the above embodiment.

[0094] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0095] The memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, that is, it implements the method for cooling the magnetic levitation compressor in the above embodiments.

[0096] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and may also include non-volatile memory.

[0097] This disclosure provides a magnetic levitation air conditioner, which includes the above-described device for cooling a magnetic levitation compressor.

[0098] This disclosure provides a storage medium storing computer-executable instructions configured to perform the above-described method for cooling a magnetically levitated compressor.

[0099] The aforementioned storage medium can be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0100] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0101] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0102] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0103] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0104] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for cooling a magnetically levitated compressor, characterized in that, A magnetic levitation compressor is used in an air conditioner. The compressor has a cooling outlet and a cooling inlet. The cooling inlet is connected to the outlet of the condenser via a cooling pipe, and the cooling pipe is equipped with a throttling element. The cooling outlet is connected to the inlet of the evaporator via a first branch, and also connected to the compressor's return port via a second branch. The method includes: Obtain the real-time temperature of the refrigerant at the cooling outlet; When the real-time temperature is greater than a temperature threshold, a first adjustment scheme for the throttling element is determined based on the pressure ratio of the magnetic levitation air conditioner and the rate of change of the refrigerant temperature at the cooling outlet. Specifically, when the pressure ratio of the magnetic levitation air conditioner is greater than or equal to the pressure ratio threshold, if the rate of change of the refrigerant temperature at the cooling outlet is greater than or equal to a first rate of change, the throttling element is adjusted to increase its opening at a first rate; otherwise, the throttling element is adjusted to increase its opening at a second rate. When the pressure ratio of the magnetic levitation air conditioner is less than the pressure ratio threshold, if the rate of change of the refrigerant temperature at the cooling outlet is greater than or equal to the first rate of change, the throttling element is adjusted to increase its opening at a third rate; otherwise, the throttling element is adjusted to increase its opening at a fourth rate. The first rate is greater than the second rate, the third rate is greater than the fourth rate, and the fourth rate is greater than or equal to the first rate. The pressure ratio of the magnetic levitation air conditioner is the ratio of the condenser pressure to the evaporator pressure. The throttling element is controlled to execute the first adjustment scheme.

2. The method according to claim 1, characterized in that, The pressure ratio of a magnetic levitation air conditioner is determined as follows: Obtain the pressure of the condenser and evaporator of the magnetic levitation air conditioner; Calculate P = (Pc + 101.325) / (Pe + 101.325); Where P is the pressure ratio, Pc is the pressure of the condenser, and Pe is the pressure of the evaporator.

3. The method according to claim 1, characterized in that, The method further includes: When the real-time temperature is less than the temperature threshold, a second adjustment scheme for the throttling element is determined based on the rate of change of the refrigerant temperature at the cooling outlet; and, The throttling element is controlled to execute the second adjustment scheme.

4. The method according to claim 3, characterized in that, The step of determining the second adjustment scheme for the throttling element based on the temperature change rate of the refrigerant at the cooling outlet includes: If the rate of change of the refrigerant temperature at the cooling outlet is greater than or equal to the second rate of change, the throttling element is determined to reduce its opening at a fifth rate. If the rate of change of the refrigerant temperature at the cooling outlet is less than the second rate of change, the throttling element is determined to reduce its opening at a sixth rate. The fifth rate is greater than the sixth rate.

5. The method according to any one of claims 1 to 4, characterized in that, The first branch is equipped with a first control valve, and the second branch is equipped with a second control valve; the method further includes: Obtain the compressor's exhaust superheat; The on / off states of the first and second control valves are controlled based on the exhaust superheat.

6. The method according to claim 5, characterized in that, The step of controlling the on / off state of the first control valve and the second control valve according to the exhaust superheat includes: When the exhaust superheat is less than or equal to the superheat threshold, the first control valve is opened and the second control valve is closed. When the exhaust superheat exceeds the superheat threshold, the first control valve is closed and the second control valve is opened.

7. A device for cooling a magnetically levitated compressor, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to, when executing the program instructions, perform the method for cooling a magnetically levitated compressor as described in any one of claims 1 to 6.

8. A magnetic levitation air conditioner, characterized in that, include: Condenser and evaporator; A magnetic levitation compressor, including a cooling inlet and a cooling outlet; and, The apparatus for cooling a magnetic levitation compressor as described in claim 7; The cooling inlet is connected to the outlet of the condenser via a cooling pipe, and the cooling pipe is equipped with a throttling element. The cooling outlet is connected to the inlet of the evaporator via a first branch and to the return port of the compressor via a second branch; a first control valve and a second control valve are respectively provided on the first branch and the second branch.

9. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the method for cooling a magnetically levitated compressor as described in any one of claims 1 to 6.

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