Air conditioner with improved oil return pipeline and compressor oil return control method

Abstract

The invention provides an air conditioner with an improved oil return pipeline and a compressor oil return control method, and is applied to the field of air conditioner control. The method comprises the steps that operation parameters of the air conditioner are obtained, and a to-be-executed oil return strategy is determined based on the operation parameters; the first valve and / or the second valve are / is controlled according to the oil return strategy to be executed; wherein the oil return strategy to be executed comprises a first oil return strategy and a second oil return strategy; the first oil return strategy is used for reducing the oil return temperature of the compressor; the second oil return strategy is used for controlling the temperature of lubricating oil flowing into the compressor to be within a preset temperature interval. According to the air conditioner with the improved oil return pipeline and the compressor oil return control method, the oil return pipeline is improved, meanwhile, the corresponding control method is combined, the exhaust temperature and the exhaust pressure are controlled within the proper range, and the operation efficiency of the air conditioner is improved.

Description

Technical Field

[0001] This application relates to the field of air conditioner control, and particularly to an air conditioner with an improved oil return pipeline and a compressor oil return control method. Background Art

[0002] With the continuous improvement of people's living standards and the continuous improvement of the intelligent level of household appliances, intelligent household appliances are becoming more and more popular. Users can use the air conditioner for heating in winter to increase the indoor temperature; they can also use the air conditioner for cooling in summer to reduce the indoor temperature.

[0003] The compressor of the air conditioner requires lubricating oil to work stably. However, due to the operation of the compressor, the lubricating oil will enter the air-conditioning pipeline together with the refrigerant and cannot return to the compressor in time. In the related art, an oil separator can be used to directly separate the lubricating oil from the refrigerant on the exhaust side and directly enter the suction side of the compressor through an oil return capillary.

[0004] However, such a method will cause the exhaust temperature and exhaust pressure to rise to a certain extent, reducing the operating efficiency of the air conditioner. Summary of the Invention

[0005] The purpose of this application is to provide an air conditioner with an improved oil return pipeline and a compressor oil return control method. By improving the oil return pipeline and combining the corresponding control method, the exhaust temperature and exhaust pressure are controlled within a suitable range, and the operating efficiency of the air conditioner is improved.

[0006] In the first aspect, this application provides an air conditioner with an improved oil return pipeline, including: A first oil path is provided between the oil separator of the air conditioner and the compressor, and a first valve is provided on the first oil path; the lubricating oil output by the oil separator flows through the first oil path through the gas-liquid separator for heat exchange; the first valve is used to control the opening and closing of the first oil path; the lubricating oil output by the oil separator flows into the compressor through the first oil path.

[0007] Optionally, a first temperature sensor and a second temperature sensor are provided on the first oil path; a third temperature sensor is provided on the oil path on the suction side of the compressor; the first temperature sensor is provided between the oil separator and the gas-liquid separator; the second temperature sensor is provided between the gas-liquid separator and the compressor; the first temperature sensor is used to detect the temperature of the lubricating oil output by the oil separator; the second temperature sensor is used to detect the temperature of the lubricating oil after heat exchange through the gas-liquid separator; the third temperature sensor is used to detect the temperature of the lubricating oil flowing into the compressor.

[0008] Optionally, the air conditioner further includes: a second oil path, and a second valve is provided on the second oil path; the second valve is used to control the opening and closing of the second oil path; when the lubricating oil flowing into the compressor has a relatively low temperature, the lubricating oil output by the oil separator flows into the compressor through the suction side of the compressor after converging through the first oil path and the second oil path.

[0009] In a second aspect, the present application provides a compressor oil return control method, which is applied to the air conditioner described in the first aspect. The method includes: Obtain the operating parameters of the air conditioner, and determine the to-be-executed oil return strategy based on the operating parameters; control the second valve and the first valve of the air conditioner according to the to-be-executed oil return strategy; wherein, the to-be-executed oil return strategy includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the temperature of the lubricating oil flowing into the compressor within a preset temperature range; the first oil return strategy includes: controlling the first valve to open and controlling the second valve to close; the second oil return strategy includes: controlling the first valve and the second valve to open simultaneously.

[0010] Optionally, the obtaining the operating parameters of the air conditioner and determining the to-be-executed oil return strategy based on the operating parameters includes: obtaining the exhaust temperature, exhaust pressure of the compressor, and the on / off state of the injection valve; when the exhaust temperature exceeds the preset exhaust temperature, and / or, the exhaust pressure exceeds the preset exhaust pressure, and / or, the injection valve changes from the open state to the closed state, determining that the to-be-executed oil return strategy is the first oil return strategy; wherein, the injection valve is a valve provided on the injection valve pipeline; the injection valve pipeline is used to discharge the cooled refrigerant into the suction side to reduce the oil return temperature of the compressor.

[0011] Optionally, the obtaining the operating parameters of the air conditioner and determining the to-be-executed oil return strategy based on the operating parameters includes: obtaining the exhaust temperature, exhaust pressure of the compressor, and the on / off state of the injection valve; when the exhaust temperature is lower than the preset exhaust temperature, and / or, the exhaust pressure is lower than the preset exhaust pressure, and / or, the injection valve changes from the closed state to the open state, determining that the to-be-executed oil return strategy is the second oil return strategy; wherein, the injection valve is a valve provided on the injection valve pipeline; the injection valve pipeline is used to discharge the cooled refrigerant into the suction side to reduce the oil return temperature of the compressor.

[0012] Optionally, obtaining the operating parameters of the air conditioner and determining the oil return strategy to be executed based on the operating parameters includes: obtaining the first temperature value of the first sensor, the second temperature value of the second sensor, and the third temperature value of the third sensor; when the difference between the first temperature value and the second temperature value is less than a preset temperature difference threshold, and / or when the third temperature value is not within the preset temperature range, determining that the oil return strategy to be executed is the second oil return strategy.

[0013] Optionally, controlling the first valve of the air conditioner and / or the second valve of the air conditioner according to the oil return strategy to be executed includes: when the third temperature value is lower than the preset temperature range, controlling the opening of the second valve to gradually increase until the opening of the second valve reaches the maximum, or the third temperature value is within the preset temperature range; or when the third temperature value is higher than the preset temperature range, controlling the opening of the second valve to gradually decrease until the second valve is closed, or the third temperature value is within the preset temperature range.

[0014] In a third aspect, the present application further provides a compressor oil return control device, which is applied to the air conditioner as described in the first aspect above. The device includes: An acquisition module, configured to acquire the operating parameters of the air conditioner; a determination module, configured to determine the oil return strategy to be executed based on the operating parameters; a control module, configured to control the first valve of the air conditioner and / or the second valve of the air conditioner according to the oil return strategy to be executed; where the oil return strategy to be executed includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the temperature of the lubricating oil flowing into the compressor to be within a preset temperature range; the first oil return strategy includes: controlling the first valve to open and controlling the second valve to close; the second oil return strategy includes: controlling the first valve and the second valve to open simultaneously.

[0015] Optionally, the acquisition module is specifically configured to acquire the exhaust temperature, exhaust pressure of the compressor, and the on-off state of the injection valve; the determination module is specifically configured to determine that the oil return strategy to be executed is the first oil return strategy when the exhaust temperature exceeds the preset exhaust temperature, and / or the exhaust pressure exceeds the preset exhaust pressure, and / or the injection valve changes from the open state to the closed state; where the injection valve is a valve provided on the injection valve pipeline; the injection valve pipeline is used to discharge the cooled refrigerant into the suction side to reduce the oil return temperature of the compressor.

[0016] Optionally, the obtaining module is specifically configured to obtain the exhaust temperature and exhaust pressure of the compressor and the on-off state of the injection valve; the determining module is specifically configured to determine that the to-be-executed oil return strategy is the second oil return strategy when the exhaust temperature is lower than a preset exhaust temperature, and / or the exhaust pressure is lower than a preset exhaust pressure, and / or the injection valve changes from a closed state to an open state; wherein, the injection valve is a valve provided on an injection valve pipeline; the injection valve pipeline is used to discharge the cooled refrigerant into the suction side to reduce the oil return temperature of the compressor.

[0017] Optionally, the obtaining module is specifically configured to obtain a first temperature value of a first sensor of the air conditioner, a second temperature value of a second sensor of the air conditioner, and a third temperature value of a third sensor of the air conditioner; the determining module is specifically configured to determine that the to-be-executed oil return strategy is the second oil return strategy when the difference between the first temperature value and the second temperature value is less than a preset temperature difference threshold, and / or the third temperature value is not within the preset temperature range.

[0018] Optionally, the control module is specifically configured to, when the third temperature value is lower than the preset temperature range, gradually increase the opening degree of the second valve until the opening degree of the second valve reaches the maximum, or the third temperature value is within the preset temperature range; the control module is further specifically configured to, when the third temperature value is higher than the preset temperature range, gradually decrease the opening degree of the second valve until the second valve is closed, or the third temperature value is within the preset temperature range.

[0019] The present application further provides a computer program product, including a computer program / instructions, and when the computer program / instructions are executed by a processor, the steps of any of the above compressor oil return control methods are implemented.

[0020] The present application further provides an electronic device, which may be an air conditioner. The air conditioner includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of any of the above compressor oil return control methods are implemented.

[0021] The present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of any of the above compressor oil return control methods are implemented.

[0022] The air conditioner with an improved oil return pipeline and the compressor oil return control method provided by the present application. A first oil pipeline is arranged between the oil separator and the compressor of the air conditioner, and a first valve is arranged on the first oil pipeline; the lubricating oil output by the oil separator flows through the first oil pipeline and passes through the gas-liquid separator for heat exchange; the first valve is used to control the opening and closing of the first oil pipeline; the lubricating oil output by the oil separator flows into the compressor through the first oil pipeline; the method includes: obtaining the operating parameters of the air conditioner and determining the oil return strategy to be executed based on the operating parameters; controlling the second valve and the first valve according to the oil return strategy to be executed; wherein, the oil return strategy to be executed includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the temperature of the lubricating oil flowing into the compressor within a preset temperature range. In this way, by improving the oil return pipeline and combining the corresponding control method, the exhaust temperature and exhaust pressure are controlled within a suitable range, and the operating efficiency of the air conditioner is improved. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the operating principle of the air conditioner provided by the present application; Figure 2 It is a schematic diagram of the improved outdoor unit structure provided by the present application; Figure 3 It is a schematic flow diagram of the compressor oil return control method provided by the present application; Figure 4 It is a schematic diagram of the structure of the compressor oil return control device provided by the present application; Figure 5 It is a schematic diagram of the structure of the electronic device provided by the present application.

[0025] 1. Variable frequency compressor, 2. Exhaust temperature sensor, 3. High pressure pressure sensor, 4. Oil separator, 5. Check valve, 6. Four-way valve, 7. Suction line stop valve, 8. Liquid line stop valve, 9. Electronic expansion valve, 10. Defrosting temperature sensor, 11. Heat exchanger, 12. Fan, 13. Low pressure pressure sensor, 14. Gas-liquid separator, 15. Injection valve, 16. Electronic expansion valve, 17. Electronic expansion valve, 18. Temperature sensor, 19. Capillary tube, 20. Temperature sensor, 21. Temperature sensor. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following will clearly and completely describe the technical solutions in this application in conjunction with the accompanying drawings in this application. Apparently, the described embodiments are some, rather than all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

[0027] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0028] The following will describe in detail the operating principle of the air conditioner involved in the embodiments of this application: As Figure 1 shown, the compressor compresses the refrigerant (refrigerant medium), which is then transported through a pipeline to the condenser. The high-temperature and high-pressure gaseous refrigerant releases heat in the condenser and becomes a medium-temperature and high-pressure liquid refrigerant. After that, the medium-temperature and high-pressure liquid refrigerant is depressurized through a capillary tube (throttling unit) and becomes a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant is transported to the evaporator and evaporates from a liquid to a gas, absorbing a large amount of heat during the evaporation process. Finally, the low-temperature and low-pressure gaseous refrigerant in the evaporator is transported to the compressor to participate in the next cycle. When the air conditioner is cooling, the heat exchanger of the outdoor unit is the condenser, and the heat exchanger of the indoor unit is the evaporator; conversely, when the air conditioner is heating, the heat exchanger of the outdoor unit is the evaporator, and the heat exchanger of the indoor unit is the condenser.

[0029] Commercial multi-connected air conditioners currently mostly use scroll or rotary compressors. Such compressors require lubricating oil to operate stably. The lubricating oil will enter the air-conditioning pipeline together with the refrigerant due to the operation of the compressor. And because the installation pipes of multi-connected air conditioners are relatively long, the lubricating oil entering the pipeline is affected by factors such as the refrigerant flow rate and refrigerant state and cannot return to the compressor in time. To solve the oil return problem, a kind of oil separator is adopted in multi-connected air conditioners, so that the lubricating oil can be directly separated from the refrigerant on the exhaust side and directly enter the suction side of the compressor through the oil return capillary, ensuring that the lubricating oil returns to the compressor along the shortest path and maintaining sufficient compressor oil volume. This kind of oil return method is simple and reliable, but there are certain disadvantages: The oil separated by the oil separator directly enters the suction side of the compressor, which will cause a relatively high suction temperature, and then affect a relatively high exhaust temperature. To deal with the problem of high exhaust temperature, the air-conditioning system always adopts a jet valve pipeline (such as Figure 2 the pipeline shown by the thick line in the middle) to discharge the cooled refrigerant into the suction side. When the jet valve is opened, a part of the refrigerant will be bypassed, and a certain amount of refrigeration / heat will be lost. At the same time, in related technologies, gas-liquid separation mostly adopts the form of upper inlet and upper outlet. The separated liquid refrigerant lacks a suitable means of gasification and mostly remains in the components, causing a certain amount of refrigerant waste, losing a certain amount of refrigeration / heat, or increasing the refrigerant filling amount of the system, resulting in an increase in the cost of the air-conditioning system.

[0030] In view of the above technical problems existing in the related technologies, the embodiments of the present application provide an improved oil return pipeline and a corresponding compressor oil return control method, which can solve the problem of high exhaust caused by oil return through the oil return capillary, and at the same time reuse the high-temperature lubricating oil to solve the problem of difficult circulation of the stored liquid refrigerant in the gas-liquid separator.

[0031] As Figure 2 shown, it is a schematic diagram of the improved outdoor unit structure provided by the embodiments of the present application. The outdoor unit includes: a variable-frequency compressor 1 (a dual-compressor outdoor unit has 2 compressors, and the exhaust pipe and the suction pipe are connected in parallel), an exhaust temperature sensor 2, a high-pressure pressure sensor 3, an oil separator 4, a check valve 5, a four-way valve 6, a gas pipe stop valve 7, a liquid pipe stop valve 8, an electronic expansion valve 9, a defrosting temperature sensor 10, a heat exchanger 11, a fan 12, a low-pressure pressure sensor 13, a gas-liquid separator 14, a jet valve 15, an electronic expansion valve 16, an electronic expansion valve 17, a temperature sensor 18, a capillary 19, a temperature sensor 20, and a temperature sensor 21.

[0032] Exemplarily, as Figure 2 shown, a first oil circuit is provided between the oil separator (i.e., Figure 2 the oil separator 4 in Figure 2 ) of the air conditioner and the compressor (i.e., Figure 2the electronic expansion valve 17) therein; the first oil circuit passes through the gas-liquid separator of the air conditioner (i.e., Figure 2 the gas-liquid separator 14) therein, and the lubricating oil output by the oil separator flows into the compressor through the first oil circuit.

[0033] In a possible implementation manner, the temperature of the lubricating oil flowing into the compressor through the first oil circuit may be relatively low. At this time, another oil circuit can be led out from the gas-liquid separator, and through mixing high-temperature and low-temperature lubricating oils, the temperature of the lubricating oil flowing into the compressor can be maintained in an appropriate state.

[0034] Exemplarily, the air conditioner further includes: a second oil circuit, and a second valve (i.e., Figure 2 the electronic expansion valve 16) therein is provided on the second oil circuit; the second valve is used to control the opening and closing of the second oil circuit; when the temperature of the lubricating oil flowing into the compressor is relatively low, the lubricating oil output by the oil separator flows into the compressor through the suction side of the compressor after converging through the first oil circuit and the second oil circuit.

[0035] It should be noted that the first valve and the second valve in the embodiments of the present application may be electronic expansion valves, or cut-off valves or other valves that can control the conduction and disconnection of the oil circuit.

[0036] Next, with reference to the drawings, the compressor oil return control method provided by the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0037] As Figure 3 shown, a compressor oil return control method provided by an embodiment of the present application may include the following steps 301 and 302: Step 301, obtain the operating parameters of the air conditioner, and determine the oil return strategy to be executed based on the operating parameters.

[0038] Step 302, control the first valve of the air conditioner, and / or, the second valve of the air conditioner according to the oil return strategy to be executed.

[0039] Wherein, the oil return strategy to be executed includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the temperature of the lubricating oil flowing into the compressor within a preset temperature range; the first oil return strategy includes: controlling the first valve to open and controlling the second valve to close; the second oil return strategy includes: controlling the first valve and the second valve to open simultaneously.

[0040] Exemplarily, the first oil return strategy includes: controlling the second valve to close and controlling the first valve to open; the second oil return strategy includes: controlling the second valve and the first valve to open simultaneously.

[0041] Exemplarily, for the above first oil return strategy, as Figure 2 shown, the system opens the electronic expansion valve 17 and closes the electronic expansion valve 16. The oil circuit enters the inside of the gas-liquid separator through pipeline connection, enabling the high-temperature lubricating oil to directly contact and exchange heat with the liquid refrigerant, thereby accelerating the vaporization of the liquid refrigerant and allowing more refrigerant to participate in the entire system cycle. At the same time, due to the cooling effect of the liquid refrigerant, the oil temperature decreases and the suction side temperature decreases.

[0042] Exemplarily, for the above second oil return strategy, as Figure 2 shown, when the oil temperature is too low, the oil return speed will be slow and the oil return will be difficult due to the increased viscosity. Therefore, when it is necessary to ensure the oil return rate, the system opens both the electronic expansion valve 16 and the electronic expansion valve 17 at the same time. By controlling the opening degree of the electronic expansion valve 16, the high-temperature lubricating oil is separated into two paths. One path enters the gas-liquid separator for heat exchange and then returns to the suction side, and the other path directly returns to the suction side and then meets with the low-temperature oil circuit, thereby controlling the oil temperature on the suction side.

[0043] Specifically, in the above step 301, for the determination of the first oil return strategy, the following steps 301a1 and 301a2 may further be included: Step 301a1: Obtain the exhaust temperature, exhaust pressure of the compressor, and the on-off state of the injection valve.

[0044] Step 301a2: In the case where the exhaust temperature exceeds the preset exhaust temperature, and / or the exhaust pressure exceeds the preset exhaust pressure, and / or the injection valve changes from the open state to the closed state, determine that the to-be-executed oil return strategy is the first oil return strategy.

[0045] Wherein, the injection valve is a valve provided on the injection valve pipeline; the injection valve pipeline is used to discharge the cooled refrigerant into the suction side to reduce the oil return temperature of the compressor.

[0046] Exemplarily, in the embodiments of the present application, the conditions for the second valve to be closed and the first valve to be opened include: 1. The exhaust temperature exceeds the preset exhaust temperature; 2. The exhaust pressure exceeds the preset exhaust pressure; 3. The injection valve changes from the open state to the closed state. When any one of the above three conditions is met, the first oil return strategy can be executed, that is, controlling the second valve to be closed and controlling the first valve to be opened.

[0047] Specifically, in the above step 301, for the determination of the second oil return strategy, the following steps 301b1 and 301b2 may further be included: Step 301b1: Obtain the exhaust temperature, exhaust pressure of the compressor, and the on-off state of the injection valve.

[0048] Step 301b2: When the exhaust gas temperature is lower than the preset exhaust gas temperature, and / or the exhaust gas pressure is lower than the preset exhaust gas pressure, and / or the injection valve changes from the closed state to the open state, determine that the to-be-executed oil return strategy is the second oil return strategy.

[0049] Wherein, the injection valve is a valve provided on the injection valve pipeline; the injection valve pipeline is used to discharge the cooled refrigerant into the suction side to reduce the oil return temperature of the compressor.

[0050] Exemplarily, in the embodiments of the present application, the conditions for the second valve to be opened and the first valve to be closed include: 1. The exhaust gas temperature is lower than the preset exhaust gas temperature; 2. The exhaust gas pressure is lower than the preset exhaust gas pressure; 3. The injection valve changes from the closed state to the open state. When any one of the above three conditions is met, the second oil return strategy can be executed, that is, control the second valve to open and control the first valve to close.

[0051] Exemplarily, a first temperature sensor (i.e., the temperature sensor 18 as shown in Figure 2 ), and a second temperature sensor (i.e., the temperature sensor 20 as shown in Figure 2 ) are provided on the first oil path; a third temperature sensor (i.e., the temperature sensor 21 as shown in Figure 2 ) is provided on the oil path on the suction side of the compressor; the first temperature sensor is arranged between the oil separator and the gas-liquid separator; the second temperature sensor is arranged between the gas-liquid separator and the compressor; the first temperature sensor is used to detect the temperature of the lubricating oil output by the oil separator; the second temperature sensor is used to detect the temperature of the lubricating oil after heat exchange through the gas-liquid separator; the third temperature sensor is used to detect the temperature of the lubricating oil flowing into the compressor.

[0052] Specifically, in the above step 301, for the determination of the second oil return strategy, the following steps 301c1 and 301c2 may further be included: Step 301c1: Obtain the first temperature value of the first sensor of the air conditioner, the second temperature value of the second sensor of the air conditioner, and the third temperature value of the third sensor of the air conditioner.

[0053] Step 301c2: When the difference between the first temperature value and the second temperature value is less than the preset temperature difference threshold, and / or the third temperature value is not within the preset temperature range, determine that the to-be-executed oil return strategy is the second oil return strategy.

[0054] Exemplarily, in the embodiments of the present application, the conditions for the second valve to open and the first valve to close further include: 1. The difference between the first temperature value and the second temperature value is less than a preset temperature difference threshold; 2. The third temperature value is not within the preset temperature range. When any of the above two conditions is met, the second oil return strategy can be executed, that is, controlling the second valve to open and controlling the first valve to close.

[0055] Further, in the embodiments of the present application, the opening degree of the second valve can also be adjusted according to the temperature range in which the third temperature value is located.

[0056] Specifically, based on the second oil return strategy determined in the above steps 301c1 and 301c2, the above step 302 may further include the following step 302a, or step 302b: Step 302a: When the third temperature value is lower than the preset temperature range, control the opening degree of the second valve to gradually increase until the opening degree of the second valve reaches the maximum, or the third temperature value is within the preset temperature range.

[0057] Step 302b: When the third temperature value is higher than the preset temperature range, control the opening degree of the second valve to gradually decrease until the second valve closes, or the third temperature value is within the preset temperature range.

[0058] Exemplarily, as Figure 2 shown, when the measured value of the temperature sensor 21 is less than the set range (i.e., the above preset temperature range), the opening degree of the electronic expansion valve 16 gradually increases until the electronic expansion valve 16 is fully opened or the temperature value reaches the set range. When the detected value of the temperature sensor 21 is greater than the set range, the opening degree of the electronic expansion valve 16 gradually decreases until the electronic expansion valve 16 is fully closed or the temperature value reaches the set range.

[0059] In this way, the form of entering the gas-liquid separator through the oil return pipeline is used to cool the lubricating oil and reduce the exhaust temperature; heat the liquid refrigerant to enable more refrigerant to enter the system cycle. And by changing the temperature difference between the temperature sensors before and after the oil return pipeline, the opening and closing of the system oil return valve are controlled to achieve the effect of controlling the oil temperature.

[0060] The compressor oil return control method provided by the embodiment of the present application. A first oil circuit is provided between the oil separator and the compressor of the air conditioner, and a first valve is provided on the first oil circuit; the lubricating oil output by the oil separator flows through the first oil circuit and passes through the gas-liquid separator for heat exchange; the first valve is used to control the opening and closing of the first oil circuit; the lubricating oil output by the oil separator flows into the compressor through the first oil circuit; the method includes: obtaining the operating parameters of the air conditioner, and determining the to-be-executed oil return strategy based on the operating parameters; controlling the second valve and the first valve according to the to-be-executed oil return strategy; wherein, the to-be-executed oil return strategy includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the temperature of the lubricating oil flowing into the compressor within a preset temperature range. In this way, by improving the oil return pipeline and combining the corresponding control method, the exhaust temperature and exhaust pressure are controlled within a suitable range, and the operating efficiency of the air conditioner is improved.

[0061] It should be noted that for the compressor oil return control method provided by the embodiment of the present application, the execution subject can be a compressor oil return control device, or a control module in the compressor oil return control device for executing the compressor oil return control method. In the embodiment of the present application, the case where the compressor oil return control device executes the compressor oil return control method is taken as an example to illustrate the compressor oil return control device provided by the embodiment of the present application.

[0062] It should be noted that in the embodiment of the present application, the compressor oil return control methods shown in the above respective method drawings are all exemplarily illustrated by taking one drawing in the embodiment of the present application as an example. Specifically in implementation, the compressor oil return control methods shown in the above respective method drawings can also be implemented in combination with any other combinable drawings schemed in the above embodiments, which will not be elaborated here.

[0063] The compressor oil return control device provided by the present application will be described below, and the description below can be mutually corresponding and referred to with the compressor oil return control method described above.

[0064] Figure 4 It is a schematic structural diagram of a compressor oil return control device provided by an embodiment of the present application, as Figure 4 shown, and specifically includes: An acquisition module 401 is configured to acquire the operating parameters of the air conditioner; a determination module 402 is configured to determine an oil return strategy to be executed based on the operating parameters; a control module 403 is configured to control a first valve of the air conditioner and / or a second valve of the air conditioner according to the oil return strategy to be executed; wherein, the oil return strategy to be executed includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the temperature of the lubricating oil flowing into the compressor to be within a preset temperature range; the first oil return strategy includes: controlling the first valve to open and controlling the second valve to close; the second oil return strategy includes: controlling the first valve and the second valve to open simultaneously.

[0065] Optionally, the acquisition module 401 is specifically configured to acquire the exhaust temperature, exhaust pressure of the compressor, and the on-off state of the injection valve; the determination module 402 is specifically configured to determine that the oil return strategy to be executed is the first oil return strategy when the exhaust temperature exceeds a preset exhaust temperature, and / or the exhaust pressure exceeds a preset exhaust pressure, and / or the injection valve changes from the open state to the closed state; wherein, the injection valve is a valve provided on the injection valve pipeline; the injection valve pipeline is used to discharge the cooled refrigerant into the suction side to reduce the oil return temperature of the compressor.

[0066] Optionally, the acquisition module 401 is specifically configured to acquire the exhaust temperature, exhaust pressure of the compressor, and the on-off state of the injection valve; the determination module 402 is specifically configured to determine that the oil return strategy to be executed is the second oil return strategy when the exhaust temperature is lower than a preset exhaust temperature, and / or the exhaust pressure is lower than a preset exhaust pressure, and / or the injection valve changes from the closed state to the open state; wherein, the injection valve is a valve provided on the injection valve pipeline; the injection valve pipeline is used to discharge the cooled refrigerant into the suction side to reduce the oil return temperature of the compressor.

[0067] Optionally, the acquisition module 401 is specifically configured to acquire a first temperature value of a first sensor of the air conditioner, a second temperature value of a second sensor of the air conditioner, and a third temperature value of a third sensor of the air conditioner; the determination module 402 is specifically configured to determine that the oil return strategy to be executed is the second oil return strategy when the difference between the first temperature value and the second temperature value is less than a preset temperature difference threshold, and / or the third temperature value is not within the preset temperature range.

[0068] Optionally, the control module 403 is specifically configured to, when the third temperature value is lower than the preset temperature range, control the opening degree of the second valve to gradually increase until the opening degree of the second valve reaches the maximum, or the third temperature value is within the preset temperature range; the control module 403 is further specifically configured to, when the third temperature value is higher than the preset temperature range, control the opening degree of the second valve to gradually decrease until the second valve is closed, or the third temperature value is within the preset temperature range.

[0069] The compressor oil return control device provided by the present application is applied to an air conditioner. A first oil circuit is provided between the oil separator and the compressor of the air conditioner, and a first valve is provided on the first oil circuit; the lubricating oil output by the oil separator flows through the first oil circuit and exchanges heat through the gas-liquid separator; the first valve is used to control the opening and closing of the first oil circuit; the lubricating oil output by the oil separator flows into the compressor through the first oil circuit; the method includes: obtaining the operating parameters of the air conditioner and determining the oil return strategy to be executed based on the operating parameters; controlling the second valve and the first valve according to the oil return strategy to be executed; wherein, the oil return strategy to be executed includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the temperature of the lubricating oil flowing into the compressor within a preset temperature range. In this way, by improving the oil return pipeline and combining the corresponding control method, the exhaust temperature and exhaust pressure are controlled within a suitable range, and the operating efficiency of the air conditioner is improved.

[0070] Figure 5 An example of a schematic physical structure diagram of an electronic device, and the electronic device may be the above-mentioned air conditioner, such as Figure 5As shown in the figure, the electronic device may include: a processor 510, a communications interface 520, a memory 530, and a communication bus 540. Among them, the processor 510, the communications interface 520, and the memory 530 communicate with each other through the communication bus 540. The processor 510 may call the logical instructions in the memory 530 to execute the compressor oil return control method, which includes: obtaining the operating parameters of the air conditioner and determining the oil return strategy to be executed based on the operating parameters; controlling the second valve and the first valve of the air conditioner according to the oil return strategy to be executed; where the oil return strategy to be executed includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the lubricating oil temperature flowing into the compressor to be within a preset temperature range; the first oil return strategy includes: controlling the first valve to open and controlling the second valve to close; the second oil return strategy includes: controlling the first valve and the second valve to open simultaneously.

[0071] In addition, when the logical instructions in the above-mentioned memory 530 can be implemented in the form of software function units and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0072] On the other hand, the present application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the compressor oil return control method provided by each of the above methods. The method includes: obtaining the operating parameters of the air conditioner, and determining an oil return strategy to be executed based on the operating parameters; controlling the second valve and the first valve of the air conditioner according to the oil return strategy to be executed; wherein, the oil return strategy to be executed includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the temperature of the lubricating oil flowing into the compressor within a preset temperature range; the first oil return strategy includes: controlling the first valve to open and controlling the second valve to close; the second oil return strategy includes: controlling the first valve and the second valve to open simultaneously.

[0073] On another aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is configured to execute the compressor oil return control method provided above. The method includes: obtaining the operating parameters of the air conditioner, and determining an oil return strategy to be executed based on the operating parameters; controlling the second valve and the first valve of the air conditioner according to the oil return strategy to be executed; wherein, the oil return strategy to be executed includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the temperature of the lubricating oil flowing into the compressor within a preset temperature range; the first oil return strategy includes: controlling the first valve to open and controlling the second valve to close; the second oil return strategy includes: controlling the first valve and the second valve to open simultaneously.

[0074] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0075] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An air conditioner with an improved oil return pipeline, characterized in that a first oil circuit is provided between the oil separator and the compressor of the air conditioner, and a first valve is provided on the first oil circuit; the lubricating oil output by the oil separator flows through the first oil circuit and exchanges heat through the gas-liquid separator; the first valve is used to control the opening and closing of the first oil circuit; the lubricating oil output by the oil separator flows into the compressor through the first oil circuit.

2. The air conditioner according to claim 1, characterized in that a first temperature sensor and a second temperature sensor are provided on the first oil circuit; a third temperature sensor is provided on the oil circuit on the suction side of the compressor; the first temperature sensor is provided between the oil separator and the gas-liquid separator; the second temperature sensor is provided between the gas-liquid separator and the compressor; the first temperature sensor is used to detect the temperature of the lubricating oil output by the oil separator; the second temperature sensor is used to detect the temperature of the lubricating oil after heat exchange through the gas-liquid separator; the third temperature sensor is used to detect the temperature of the lubricating oil flowing into the compressor.

3. The air conditioner according to claim 1 or 2, characterized in that, The air conditioner further includes: a second oil circuit, and a second valve is provided on the second oil circuit; the second valve is used to control the opening and closing of the second oil circuit; when the temperature of the lubricating oil flowing into the compressor is relatively low, the lubricating oil output by the oil separator flows into the compressor through the suction side of the compressor after converging through the first oil circuit and the second oil circuit.

4. A compressor oil return control method, characterized in that, Applied to the air conditioner according to any one of claims 1 to 3, the method includes: acquiring the operating parameters of the air conditioner, and determining the oil return strategy to be executed based on the operating parameters; controlling the first valve of the air conditioner and / or the second valve of the air conditioner according to the oil return strategy to be executed; wherein, the oil return strategy to be executed includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the temperature of the lubricating oil flowing into the compressor within a preset temperature range; the first oil return strategy includes: controlling the first valve to open and controlling the second valve to close; the second oil return strategy includes: controlling the first valve and the second valve to open simultaneously.

5. The method according to claim 4, wherein The acquiring the operating parameters of the air conditioner and determining the oil return strategy to be executed based on the operating parameters includes: acquiring the exhaust temperature, exhaust pressure of the compressor and the on-off state of the injection valve; when the exhaust temperature exceeds the preset exhaust temperature, and / or the exhaust pressure exceeds the preset exhaust pressure, and / or the injection valve changes from the open state to the closed state, determining that the oil return strategy to be executed is the first oil return strategy; wherein, the injection valve is a valve provided on the injection valve pipeline; the injection valve pipeline is used to discharge the cooled refrigerant into the suction side to reduce the oil return temperature of the compressor.

6. The method according to claim 4, characterized in that, The acquiring the operating parameters of the air conditioner and determining the oil return strategy to be executed based on the operating parameters includes: acquiring the exhaust temperature, exhaust pressure of the compressor and the on-off state of the injection valve; When the exhaust temperature is lower than a preset exhaust temperature, and / or, the exhaust pressure is lower than a preset exhaust pressure, and / or, the injection valve changes from a closed state to an open state, it is determined that the to-be-executed oil return strategy is the second oil return strategy; Wherein, the injection valve is a valve provided on an injection valve pipeline; the injection valve pipeline is used to discharge the cooled refrigerant into the suction side to reduce the oil return temperature of the compressor.

7. The method according to claim 4, characterized in that, The obtaining the operating parameters of the air conditioner and determining the to-be-executed oil return strategy based on the operating parameters includes: Obtaining a first temperature value of a first sensor of the air conditioner, a second temperature value of a second sensor of the air conditioner, and a third temperature value of a third sensor of the air conditioner; When the difference between the first temperature value and the second temperature value is less than a preset temperature difference threshold, and / or, the third temperature value is not within the preset temperature range, it is determined that the to-be-executed oil return strategy is the second oil return strategy.

8. The method according to claim 7, wherein The controlling the first valve of the air conditioner and / or the second valve of the air conditioner according to the to-be-executed oil return strategy includes: When the third temperature value is lower than the preset temperature range, controlling the opening degree of the second valve to gradually increase until the opening degree of the second valve reaches the maximum, or the third temperature value is within the preset temperature range; Or, When the third temperature value is higher than the preset temperature range, controlling the opening degree of the second valve to gradually decrease until the second valve is closed, or the third temperature value is within the preset temperature range.

9. An oil return control device for a compressor, characterized in that, Applied to the air conditioner according to any one of claims 1 to 3, the device includes: An obtaining module, configured to obtain the operating parameters of the air conditioner; A determining module, configured to determine the to-be-executed oil return strategy based on the operating parameters; A control module, configured to control the first valve of the air conditioner and / or the second valve of the air conditioner according to the to-be-executed oil return strategy; Wherein, the to-be-executed oil return strategy includes: a first oil return strategy and a second oil return strategy; the first oil return strategy is used to reduce the oil return temperature of the compressor; the second oil return strategy is used to control the lubricating oil temperature flowing into the compressor to be within a preset temperature range; the first oil return strategy includes: controlling the first valve to open and controlling the second valve to close; the second oil return strategy includes: controlling the first valve and the second valve to open simultaneously.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed by a processor, the steps of the compressor oil return control method according to any one of claims 4 to 8 are implemented.

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