Air conditioner compressor oil return quantity control method and device and air conditioner

Abstract

The invention provides an air conditioner compressor oil return quantity control method and device and an air conditioner, and is applied to the field of air conditioner control. The method comprises the steps that operation state parameters of the air conditioner are obtained, and a temperature difference value is calculated based on the operation state parameters; the opening degree of the electronic expansion valve is adjusted based on the temperature difference value and the opening degree state combination of the first sensor and the second sensor; the electronic expansion valve is arranged between the oil separator and the gas-liquid separator and used for adjusting the oil return amount. The first sensor is an oil level sensor used for detecting a low oil level in the compressor; the second sensor is an oil level sensor used for detecting the high oil level in the compressor. According to the air conditioner compressor oil return quantity control method and device and the air conditioner, the oil return quantity of the air conditioner compressor is controlled, so that the lubricating oil in the compressor is always in a relatively moderate state, and the influence on operation of the air conditioner caused by too much or too little lubricating oil in the compressor is avoided.

Description

Technical Field

[0001] This application relates to the field of air conditioner control, and particularly to a method and device for controlling the oil return amount of an air conditioner compressor and an air conditioner. 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 lower the indoor temperature.

[0003] During the operation of the air conditioner compressor, a part of the lubricating oil is discharged together with the refrigerant. After that, it is separated by an oil separator, and the separated lubricating oil will flow back to the oil tank of the compressor through the oil return pipeline for recycling.

[0004] However, in the related art, the oil return amount is usually not controlled, resulting in the oil return amount being unable to meet the requirements under different working conditions, thereby affecting the cooling / heating capacity of the air conditioner. Summary of the Invention

[0005] The purpose of this application is to provide a method and device for controlling the oil return amount of an air conditioner compressor and an air conditioner, which are used to control the oil return amount of the air conditioner compressor, so that the lubricating oil in the compressor is always in a relatively moderate state, and to avoid the influence on the operation of the air conditioner caused by too much or too little lubricating oil in the compressor.

[0006] This application provides a method for controlling the oil return amount of an air conditioner compressor, including: Obtaining the operating state parameters of the air conditioner, and calculating a temperature difference based on the operating state parameters; adjusting the opening degree of the electronic expansion valve based on the temperature difference and the opening degree state combination of the first sensor and the second sensor; wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is: an electronic expansion valve for adjusting the oil return amount provided between the oil separator and the gas-liquid separator of the air conditioner; the first sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a low oil level; the second sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a high oil level.

[0007] Optionally, the obtaining the operating state parameters of the air conditioner and calculating a temperature difference based on the operating state parameters includes: when the air conditioner is operating in the cooling mode, obtaining the actual evaporation temperature and the target evaporation temperature at the current moment; calculating the difference between the actual evaporation temperature and the target evaporation temperature to obtain the temperature difference.

[0008] Optionally, obtaining the operating state parameters of the air conditioner and calculating the temperature difference based on the operating state parameters includes: when the air conditioner is operating in the heating mode, obtaining the actual condensation temperature and the target condensation temperature at the current moment; calculating the difference between the actual condensation temperature and the target condensation temperature to obtain the temperature difference.

[0009] Optionally, adjusting the opening degree of the electronic expansion valve based on the temperature difference and the states of the first sensor and the second sensor includes: when the opening degree state combination of the first sensor and the second sensor is the first state combination, adjusting the opening degree of the electronic expansion valve to the maximum opening degree until the opening degree state combination of the first sensor and the second sensor is the second state combination; or, when the opening degree state combination of the first sensor and the second sensor is the third state combination, reducing the opening degree of the electronic expansion valve based on the current opening degree until the opening degree state combination of the first sensor and the second sensor is the second state combination; wherein, the first state combination is that neither the first sensor nor the second sensor detects the oil level; the second state combination is that the first sensor detects the oil level and the second sensor does not detect the oil level; the third state combination is that both the first sensor and the second sensor detect the oil level.

[0010] Optionally, adjusting the opening degree of the electronic expansion valve based on the temperature difference and the states of the first sensor and the second sensor includes: when the opening degree state combination of the first sensor and the second sensor is the second state combination, adjusting the opening degree of the electronic expansion valve based on the temperature difference and the adjustment coefficient; wherein, the opening degree of the electronic expansion valve is positively correlated with the temperature difference.

[0011] Optionally, adjusting the opening degree of the electronic expansion valve based on the temperature difference and the states of the first sensor and the second sensor includes: when the opening degree state combination of the first sensor and the second sensor changes from the second state combination to the first state combination, adjusting the opening degree of the electronic expansion valve to the maximum opening degree and increasing the adjustment coefficient until after the opening degree state combination of the first sensor and the second sensor changes from the first state combination to the second state combination, adjusting the opening degree of the electronic expansion valve based on the adjusted adjustment coefficient.

[0012] Optionally, adjusting the opening degree of the electronic expansion valve based on the temperature difference and the states of the first sensor and the second sensor includes: when the opening degree state combination of the first sensor and the second sensor changes from the second state combination to the third state combination, reducing the opening degree of the electronic expansion valve on the basis of the current opening degree and reducing the adjustment coefficient until the opening degree state combination of the first sensor and the second sensor changes from the third state combination to the second state combination, and then adjusting the opening degree of the electronic expansion valve based on the adjusted adjustment coefficient.

[0013] The present application also provides an air conditioner compressor oil return amount control device, including: An acquisition module for acquiring the operating state parameters of the air conditioner; a calculation module for calculating a temperature difference based on the operating state parameters; a control module for adjusting the opening degree of the electronic expansion valve based on the temperature difference and the opening degree state combination of the first sensor and the second sensor; wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is: an electronic expansion valve provided between the oil separator and the gas-liquid separator of the air conditioner for adjusting the oil return amount; the first sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a low oil level; the second sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a high oil level.

[0014] Optionally, the acquisition module is specifically configured to acquire the actual evaporation temperature and the target evaporation temperature at the current moment when the air conditioner is operating in the cooling mode; the calculation module is specifically configured to calculate the difference between the actual evaporation temperature and the target evaporation temperature to obtain the temperature difference.

[0015] Optionally, the acquisition module is specifically configured to acquire the actual condensation temperature and the target condensation temperature at the current moment when the air conditioner is operating in the heating mode; the calculation module is specifically configured to calculate the difference between the actual condensation temperature and the target condensation temperature to obtain the temperature difference.

[0016] Optionally, the control module is specifically configured to, when the opening state combination of the first sensor and the second sensor is the first state combination, adjust the opening of the electronic expansion valve to the maximum opening until the opening state combination of the first sensor and the second sensor is the second state combination; the control module is further specifically configured to, when the opening state combination of the first sensor and the second sensor is the third state combination, reduce the opening of the electronic expansion valve on the basis of the current opening until the opening state combination of the first sensor and the second sensor is the second state combination; wherein, the first state combination is that neither the first sensor nor the second sensor detects the oil level; the second state combination is that the first sensor detects the oil level and the second sensor does not detect the oil level; the third state combination is that both the first sensor and the second sensor detect the oil level.

[0017] Optionally, the control module is specifically configured to, when the opening state combination of the first sensor and the second sensor is the second state combination, adjust the opening of the electronic expansion valve based on the temperature difference and the adjustment coefficient; wherein, the opening of the electronic expansion valve is positively correlated with the temperature difference.

[0018] Optionally, the control module is specifically configured to, when the opening state combination of the first sensor and the second sensor changes from the second state combination to the first state combination, adjust the opening of the electronic expansion valve to the maximum opening and increase the adjustment coefficient until, after the opening state combination of the first sensor and the second sensor changes from the first state combination to the second state combination, adjust the opening of the electronic expansion valve based on the adjusted adjustment coefficient.

[0019] Optionally, the control module is specifically configured to, when the opening state combination of the first sensor and the second sensor changes from the second state combination to the third state combination, reduce the opening of the electronic expansion valve on the basis of the current opening and reduce the adjustment coefficient until, after the opening state combination of the first sensor and the second sensor changes from the third state combination to the second state combination, adjust the opening of the electronic expansion valve based on the adjusted adjustment coefficient.

[0020] The present application also provides a computer program product, including a computer program / instructions, which when executed by a processor implement the steps of the air conditioner compressor oil return amount control method as described in any one of the above.

[0021] 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 the air conditioner compressor oil return amount control method as described in any one of the above are implemented.

[0022] The present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the air conditioner compressor oil return amount control method as described in any one of the above are implemented.

[0023] For the air conditioner compressor oil return amount control method, device and air conditioner provided by the present application, first, the operating state parameters of the air conditioner are obtained, and the temperature difference is calculated based on the operating state parameters; then, based on the temperature difference and the opening state combination of the first sensor and the second sensor, the opening of the electronic expansion valve is adjusted; wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is the electronic expansion valve for adjusting the oil return amount provided between the oil separator and the gas-liquid separator of the air conditioner; the first sensor is the oil level sensor for detecting the low oil level provided in the compressor of the air conditioner; the second sensor is the oil level sensor for detecting the high oil level provided in the compressor of the air conditioner. In this way, the oil return amount of the air conditioner compressor is controlled, so that the lubricating oil in the compressor is always in a relatively moderate state, avoiding the influence on the operation of the air conditioner due to too much or too little lubricating oil in the compressor. Description of the Drawings

[0024] 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, other drawings can be obtained based on these drawings without creative efforts.

[0025] 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 structure of the air conditioner refrigeration system provided by the present application; Figure 3 It is one of the flow diagrams of the air conditioner compressor oil return amount control method provided by the present application; Figure 4 It is the second flow diagram of the air conditioner compressor oil return amount control method provided by the present application; Figure 5It is the third schematic flow chart of the method for controlling the oil return amount of the air conditioner compressor provided by this application; Figure 6 It is the schematic structural diagram of the device for controlling the oil return amount of the air conditioner compressor provided by this application; Figure 7 It is the schematic structural diagram of the electronic device provided by this application.

[0026] 1. Compressor, 2. Heating tape, 3. Oil separator, 4. Check valve, 5. Four-way valve, 6. Electronic expansion valve, 7. Condenser, 8. Gas-liquid separator, 9. Electronic expansion valve, 10. Check valve, 11. Sensor 1, 12. Sensor 2. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below with reference to the accompanying drawings in this application. Obviously, the described embodiments are some but not 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 making creative efforts shall fall within the protection scope of this application.

[0028] 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 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 herein, and the objects distinguished by "first", "second", etc. are usually of the same category, 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 indicates an "or" relationship between the associated objects before and after.

[0029] The following will describe in detail the operating principle of the air conditioner involved in the embodiments of this application: As Figure 1As shown in the figure, the compressor compresses the refrigerant, and transports it to the condenser through a pipeline. The high-temperature and high-pressure gaseous refrigerant releases heat in the condenser and becomes a medium-temperature and high-pressure liquid refrigerant. Then, the medium-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant after the pressure is reduced by a capillary tube (throttling unit). The low-temperature and low-pressure liquid refrigerant is transported to the evaporator and evaporated from a liquid into a gas, and absorbs 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 and participates 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.

[0030] The oil return of the air conditioner unit usually uses an oil return capillary tube. The specification of the capillary tube is a fixed value, resulting in a fixed oil return flow rate. However, the amount of oil required for oil return is different under different working conditions. The oil return capillary tube is usually sized to meet the oil volume of the compressor oil under the most severe working conditions. Under normal working conditions, the oil return amount is not required to be so large, and the capillary tube specification can be smaller. When the capillary tube specification is small, the refrigerant bypass amount is small, and the unit capacity will be high. When the specification is large, the refrigerant bypass amount is large, and the unit capacity will be small, resulting in a worse effect.

[0031] In view of the above problems existing in the related art, the embodiments of the present application have improved the refrigeration system in the related art, as Figure 2 shown, the refrigeration system includes: a compressor, a heating belt, an oil separator, a one-way valve, a four-way valve, an electronic expansion valve, a condenser, a gas-liquid separator, an electronic expansion valve, a one-way valve, a sensor 1, and a sensor 2. Among them, sensor 1 and sensor 2 are oil level sensors arranged inside the compressor for detecting the oil level height, and the electronic expansion valve numbered 6 in the drawing is an electronic expansion valve arranged between the oil separator and the gas-liquid separator of the air conditioner for adjusting the oil return amount. By the signals of sensor 1 and sensor 2 and the calculated temperature difference, the electronic expansion valve can be adjusted, thereby realizing the adjustment of the oil return amount of the compressor, so that the lubricating oil in the compressor always remains in a moderate state, avoiding a greater impact on the operation of the air conditioner.

[0032] The following will combine the drawings and specifically describe the air conditioner compressor oil return amount control method provided by the embodiments of the present application through specific embodiments and their application scenarios.

[0033] As Figure 3 shown, an air conditioner compressor oil return amount control method provided by an embodiment of the present application may include the following steps 301 and 302: Step 301, obtain the operating state parameters of the air conditioner, and calculate the temperature difference based on the operating state parameters.

[0034] Wherein, in the refrigeration mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature.

[0035] Exemplarily, when the air conditioner is in different operating modes, the above-mentioned operating state parameters are also different. When the air conditioner is operating in the refrigeration mode, the above-mentioned operating state parameters include: the evaporation temperature at the current moment and the target evaporation temperature; the target evaporation temperature is the target value of the evaporation temperature. When the air conditioner is operating in the heating mode, the above-mentioned operating state parameters include: the condensation temperature at the current moment and the target condensation temperature; the target condensation temperature is the target value of the condensation temperature.

[0036] Specifically, when the operating mode of the air conditioner is the refrigeration mode, step 301 may further include the following steps 301a1 and 301a2: Step 301a1: When the air conditioner is operating in the refrigeration mode, obtain the actual evaporation temperature and the target evaporation temperature at the current moment.

[0037] Step 301a2: Calculate the difference between the actual evaporation temperature and the target evaporation temperature to obtain the temperature difference.

[0038] Specifically, when the operating mode of the air conditioner is the heating mode, step 301 may further include the following steps 301b1 and 301b2: Step 301b1: When the air conditioner is operating in the heating mode, obtain the actual condensation temperature and the target condensation temperature at the current moment.

[0039] Step 301b2: Calculate the difference between the actual condensation temperature and the target condensation temperature to obtain the temperature difference.

[0040] Exemplarily, the greater the above-mentioned temperature difference, the higher the requirement for the operating frequency of the compressor, that is, the compressor frequency is positively correlated with the temperature difference. Since a part of the lubricating oil flows out together with the refrigerant when the compressor operates, therefore, the higher the compressor frequency, the more lubricating oil is required for replenishment accordingly. Based on this, the opening degree of the electronic expansion valve can be adjusted according to this temperature difference.

[0041] Step 302: Adjust the opening degree of the electronic expansion valve based on the temperature difference and the opening state combination of the first sensor and the second sensor.

[0042] Among them, the electronic expansion valve is: an electronic expansion valve for adjusting the oil return amount, which is arranged between the oil separator and the gas-liquid separator of the air conditioner; the first sensor is an oil level sensor for detecting a low oil level, which is arranged inside the compressor of the air conditioner; the second sensor is an oil level sensor for detecting a high oil level, which is arranged inside the compressor of the air conditioner.

[0043] Exemplarily, after calculating the above temperature difference, it is also necessary to determine the high or low oil level inside the compressor according to the above first sensor and second sensor. In the embodiment of the present application, the oil level inside the compressor can be divided into three gears according to the opening state combination of the first sensor and the second sensor, that is, when the opening state combination is the first state combination, it represents the first gear with a low oil level inside the compressor; when the opening state combination is the second state combination, it represents the second gear with a moderate oil level inside the compressor; when the opening state combination is the third state combination, it represents the third gear with a high oil level inside the compressor.

[0044] Exemplarily, the oil return amount control method in the embodiment of the present application is used to control the oil level inside the compressor in a moderate state. The above first sensor can be arranged in the area near the bottom of the compressor, and the above second sensor can be arranged above the first sensor inside the compressor.

[0045] Specifically, for the control step when the oil level inside the compressor is in the first gear, the above step 302 may further include the following step 302a: Step 302a: When the opening state combination of the first sensor and the second sensor is the first state combination, adjust the opening of the electronic expansion valve to the maximum opening until the opening state combination of the first sensor and the second sensor is the second state combination.

[0046] Specifically, for the control step when the oil level inside the compressor is in the third gear, the above step 302 may further include the following step 302b: Step 302b: When the opening state combination of the first sensor and the second sensor is the third state combination, reduce the opening of the electronic expansion valve on the basis of the current opening until the opening state combination of the first sensor and the second sensor is the second state combination.

[0047] Among them, the first state combination is: neither the first sensor nor the second sensor detects the oil level; the second state combination is: the first sensor detects the oil level and the second sensor does not detect the oil level; the third state combination is: both the first sensor and the second sensor detect the oil level.

[0048] Exemplarily, in the embodiments of the present application, when the compressor is in the first gear, the opening degree of the electronic expansion valve is adjusted to the maximum opening degree to increase the oil return amount and make the oil level in the compressor rise to the appropriate second gear as soon as possible; when the compressor is in the third gear, the opening degree of the electronic expansion valve is reduced based on the current opening degree to increase the oil return amount and make the oil level in the compressor drop to the appropriate second gear as soon as possible.

[0049] Specifically, for the control of the electronic expansion valve when the oil level in the compressor is in the second gear, step 302 above may further include the following step 302c: Step 302c: When the opening degree states of the first sensor and the second sensor are combined into the second state combination, the opening degree of the electronic expansion valve is adjusted based on the temperature difference and the adjustment coefficient.

[0050] Wherein, the opening degree of the electronic expansion valve is positively correlated with the temperature difference.

[0051] Exemplarily, when the oil level in the compressor is in the second gear, the opening degree of the electronic expansion valve can be adjusted according to the temperature difference calculated in step 301 above and the adjustment coefficient. The larger the temperature difference, the higher the opening degree of the electronic expansion valve to cope with the larger oil consumption.

[0052] For example, as Figure 4 shown, after the air conditioner starts and runs stably, the temperature difference can be calculated according to the operating state, and the sensor states (including the states of the first sensor and the second sensor) can be obtained. Then, the opening degree state combination of the sensors is judged: when the opening degree state combination is the first state combination, the lubricating oil in the compressor is less, and at this time, the opening degree of the electronic expansion valve needs to be set to the maximum opening degree to increase the oil return amount; when the opening degree state combination is the second state combination, the lubricating oil in the compressor is moderate, and at this time, the opening degree of the electronic expansion valve can be adjusted according to the temperature difference to keep the oil amount in the compressor in a moderate state all the time; when the opening degree state combination is the third state combination, the lubricating oil in the compressor is more, and at this time, the opening degree of the electronic expansion valve needs to be reduced based on the current opening degree to make the oil amount in the compressor drop slowly.

[0053] In this way, the opening degree of the electronic expansion valve can be adjusted in time according to the temperature difference to meet the demand of the compressor for lubricating oil.

[0054] Optionally, in the embodiments of the present application, for the control when the oil level in the compressor is in the second gear, it is possible that the oil level in the compressor changes from the second gear to the first gear or the third gear. At this time, the adjustment coefficient needs to be adjusted appropriately to keep the oil level in the compressor stable.

[0055] Specifically, for the case where the oil level in the compressor changes from the second gear to the first gear, the above step 302 may further include the following step 302d: Step 302d: When the opening state combination of the first sensor and the second sensor changes from the second state combination to the first state combination, adjust the opening of the electronic expansion valve to the maximum opening, and increase the adjustment coefficient until the opening state combination of the first sensor and the second sensor changes from the first state combination to the second state combination, and then adjust the opening of the electronic expansion valve based on the adjusted adjustment coefficient.

[0056] Specifically, for the case where the oil level in the compressor changes from the second gear to the third gear, the above step 302 may further include the following step 302e: Step 302e: When the opening state combination of the first sensor and the second sensor changes from the second state combination to the third state combination, reduce the opening of the electronic expansion valve on the basis of the current opening, and reduce the adjustment coefficient until the opening state combination of the first sensor and the second sensor changes from the third state combination to the second state combination, and then adjust the opening of the electronic expansion valve based on the adjusted adjustment coefficient.

[0057] For example, as Figure 5 shown, when it is determined from the opening state combination of the oil level sensors (i.e., the above-mentioned first sensor and second sensor) provided in the compressor that the oil level in the compressor changes from the second gear to the first gear (i.e., the opening state combination changes from the second state combination to the first state combination), it indicates that the previous adjustment amplitude of the opening is small. At this time, while controlling the electronic expansion valve to the maximum opening, the adjustment coefficient can be increased; when it is determined from the opening state combination of the oil level sensors (i.e., the above-mentioned first sensor and second sensor) provided in the compressor that the oil level in the compressor changes from the second gear to the third gear (i.e., the opening state combination changes from the second state combination to the third state combination), it indicates that the previous adjustment amplitude of the opening is large. At this time, while reducing the opening of the electronic expansion valve, the adjustment coefficient can be reduced.

[0058] In this way, by adjusting the opening of the electronic expansion valve, the lubricating oil in the compressor can always be kept in a moderate state.

[0059] The method for controlling the oil return amount of an air conditioner compressor provided by an embodiment of the present application first obtains the operating state parameters of the air conditioner and calculates the temperature difference based on the operating state parameters; then, adjusts the opening of the electronic expansion valve based on the temperature difference and the opening state combination of the first sensor and the second sensor; wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is: an electronic expansion valve provided between the oil separator and the gas-liquid separator of the air conditioner for adjusting the oil return amount; the first sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a low oil level; the second sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a high oil level. In this way, the oil return amount of the air conditioner compressor is controlled, so that the lubricating oil in the compressor is always in a relatively moderate state, avoiding the influence on the operation of the air conditioner due to too much or too little lubricating oil in the compressor.

[0060] It should be noted that for the method for controlling the oil return amount of an air conditioner compressor provided by an embodiment of the present application, the execution subject can be an air conditioner compressor oil return amount control device, or a control module in the air conditioner compressor oil return amount control device for executing the method for controlling the oil return amount of the air conditioner compressor. In an embodiment of the present application, taking the air conditioner compressor oil return amount control device executing the method for controlling the oil return amount of the air conditioner compressor as an example, the air conditioner compressor oil return amount control device provided by the embodiment of the present application is described.

[0061] It should be noted that in an embodiment of the present application, the method for controlling the oil return amount of the air conditioner compressor shown in each of the above-mentioned method drawings is exemplarily described by taking one drawing in the embodiment of the present application as an example. Specifically, when implemented, the method for controlling the oil return amount of the air conditioner compressor shown in each of the above-mentioned method drawings can also be implemented in combination with any other drawings that can be combined as shown in the above-mentioned embodiments, which will not be elaborated here.

[0062] The air conditioner compressor oil return amount control device provided by the present application is described below, and the description below can be mutually referred to with the method for controlling the oil return amount of the air conditioner compressor described above.

[0063] Figure 6 is a schematic structural diagram of an air conditioner compressor oil return amount control device provided by an embodiment of the present application, as Figure 6 shown, specifically including: An acquisition module 601 for acquiring the operating state parameters of the air conditioner; a calculation module 602 for calculating a temperature difference based on the operating state parameters; a control module 603 for adjusting the opening degree of the electronic expansion valve based on the temperature difference and the opening degree state combination of the first sensor and the second sensor; wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is: an electronic expansion valve provided between the oil separator and the gas-liquid separator of the air conditioner for adjusting the oil return amount; the first sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a low oil level; the second sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a high oil level.

[0064] Optionally, the acquisition module 601 is specifically configured to acquire the actual evaporation temperature and the target evaporation temperature at the current moment when the air conditioner is operating in the cooling mode; the calculation module 602 is specifically configured to calculate the difference between the actual evaporation temperature and the target evaporation temperature to obtain the temperature difference.

[0065] Optionally, the acquisition module 601 is specifically configured to acquire the actual condensation temperature and the target condensation temperature at the current moment when the air conditioner is operating in the heating mode; the calculation module 602 is specifically configured to calculate the difference between the actual condensation temperature and the target condensation temperature to obtain the temperature difference.

[0066] Optionally, the control module 603 is specifically configured to, when the opening degree state combination of the first sensor and the second sensor is the first state combination, adjust the opening degree of the electronic expansion valve to the maximum opening degree until the opening degree state combination of the first sensor and the second sensor is the second state combination; the control module 603 is further specifically configured to, when the opening degree state combination of the first sensor and the second sensor is the third state combination, reduce the opening degree of the electronic expansion valve on the basis of the current opening degree until the opening degree state combination of the first sensor and the second sensor is the second state combination; wherein, the first state combination is: neither the first sensor nor the second sensor detects the oil level; the second state combination is: the first sensor detects the oil level and the second sensor does not detect the oil level; the third state combination is: both the first sensor and the second sensor detect the oil level.

[0067] Optionally, the control module 603 is specifically configured to adjust the opening degree of the electronic expansion valve based on the temperature difference and an adjustment coefficient when the opening degree states of the first sensor and the second sensor are combined into the second state combination; wherein, the opening degree of the electronic expansion valve is positively correlated with the temperature difference.

[0068] Optionally, when the opening degree states of the first sensor and the second sensor are combined and changed from the second state combination to the first state combination, the control module 603 is specifically configured to adjust the opening degree of the electronic expansion valve to the maximum opening degree and increase the adjustment coefficient until the opening degree states of the first sensor and the second sensor are combined and changed from the first state combination to the second state combination, and then adjust the opening degree of the electronic expansion valve based on the adjusted adjustment coefficient.

[0069] Optionally, when the opening degree states of the first sensor and the second sensor are combined and changed from the second state combination to the third state combination, the control module 603 is specifically configured to reduce the opening degree of the electronic expansion valve on the basis of the current opening degree and reduce the adjustment coefficient until the opening degree states of the first sensor and the second sensor are combined and changed from the third state combination to the second state combination, and then adjust the opening degree of the electronic expansion valve based on the adjusted adjustment coefficient.

[0070] The oil return amount control device for an air conditioner compressor provided by this application first obtains the operating state parameters of the air conditioner and calculates the temperature difference based on the operating state parameters; then, adjusts the opening degree of the electronic expansion valve based on the temperature difference and the opening degree state combination of the first sensor and the second sensor; wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is: an electronic expansion valve for adjusting the oil return amount provided between the oil separator and the gas-liquid separator of the air conditioner; the first sensor is an oil level sensor for detecting a low oil level provided inside the compressor of the air conditioner; the second sensor is an oil level sensor for detecting a high oil level provided inside the compressor of the air conditioner. In this way, the oil return amount of the air conditioner compressor is controlled, so that the lubricating oil in the compressor is always in a relatively moderate state, avoiding the influence on the operation of the air conditioner due to too much or too little lubricating oil in the compressor.

[0071] Figure 7 An example of a schematic physical structure diagram of an electronic device, and the electronic device can be the above-mentioned air conditioner, such as Figure 7As shown in the figure, the electronic device may include: a processor 710, a communications interface 720, a memory 730, and a communication bus 740. Among them, the processor 710, the communications interface 720, and the memory 730 complete communication with each other through the communication bus 740. The processor 710 may call the logical instructions in the memory 730 to execute the method for controlling the oil return amount of the air conditioner compressor. The method includes: obtaining the operating state parameters of the air conditioner and calculating the temperature difference based on the operating state parameters; adjusting the opening degree of the electronic expansion valve based on the temperature difference and the opening degree state combination of the first sensor and the second sensor; wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is: an electronic expansion valve for adjusting the oil return amount provided between the oil separator and the gas-liquid separator of the air conditioner; the first sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a low oil level; the second sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a high oil level.

[0072] In addition, when the logical instructions in the above-mentioned memory 730 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an 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 for causing 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 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.

[0073] On the other hand, the present application also provides a computer program product. The computer program product 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 air conditioner compressor oil return amount control method provided by the above-mentioned various methods. The method includes: obtaining the operating state parameters of the air conditioner and calculating a temperature difference based on the operating state parameters; adjusting the opening degree of the electronic expansion valve based on the temperature difference and the opening degree state combination of the first sensor and the second sensor; wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is: an electronic expansion valve provided between the oil separator and the gas-liquid separator of the air conditioner for adjusting the oil return amount; the first sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a low oil level; the second sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a high oil level.

[0074] In 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 air conditioner compressor oil return amount control method provided by the above-mentioned various methods. The method includes: obtaining the operating state parameters of the air conditioner and calculating a temperature difference based on the operating state parameters; adjusting the opening degree of the electronic expansion valve based on the temperature difference and the opening degree state combination of the first sensor and the second sensor; wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is: an electronic expansion valve provided between the oil separator and the gas-liquid separator of the air conditioner for adjusting the oil return amount; the first sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a low oil level; the second sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a high oil level.

[0075] 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 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. A person of ordinary skill in the art can understand and implement it without creative labor.

[0076] 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 this 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. This 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, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0077] 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. A method for controlling the oil return amount of an air conditioner compressor, characterized in that, Applied to an air conditioner, the method includes: Obtain the operating state parameters of the air conditioner, and calculate the temperature difference based on the operating state parameters; Adjust the opening degree of the electronic expansion valve based on the temperature difference and the opening degree state combination of the first sensor and the second sensor; Wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is: an electronic expansion valve for adjusting the oil return amount provided between the oil separator and the gas-liquid separator of the air conditioner; the first sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a low oil level; the second sensor is an oil level sensor provided in the compressor of the air conditioner for detecting a high oil level.

2. The method according to claim 1, characterized in that, The obtaining the operating state parameters of the air conditioner and calculating the temperature difference based on the operating state parameters includes: When the air conditioner is operating in the cooling mode, obtain the actual evaporation temperature and the target evaporation temperature at the current moment; Calculate the difference between the actual evaporation temperature and the target evaporation temperature to obtain the temperature difference.

3. The method according to claim 1, characterized in that The obtaining the operating state parameters of the air conditioner and calculating the temperature difference based on the operating state parameters includes: When the air conditioner is operating in the heating mode, obtain the actual condensation temperature and the target condensation temperature at the current moment; Calculate the difference between the actual condensation temperature and the target condensation temperature to obtain the temperature difference.

4. The method according to any one of claims 1 to 3, characterized in that, The adjusting the opening degree of the electronic expansion valve based on the temperature difference and the states of the first sensor and the second sensor includes: When the opening degree state combination of the first sensor and the second sensor is the first state combination, adjust the opening degree of the electronic expansion valve to the maximum opening degree until the opening degree state combination of the first sensor and the second sensor is the second state combination; Or, When the opening degree state combination of the first sensor and the second sensor is the third state combination, reduce the opening degree of the electronic expansion valve on the basis of the current opening degree until the opening degree state combination of the first sensor and the second sensor is the second state combination; Wherein, the first state combination is: neither the first sensor nor the second sensor detects the oil level; the second state combination is: the first sensor detects the oil level and the second sensor does not detect the oil level; the third state combination is: both the first sensor and the second sensor detect the oil level.

5. The method according to claim 4, wherein The adjusting the opening degree of the electronic expansion valve based on the temperature difference and the states of the first sensor and the second sensor includes: When the opening degree state combination of the first sensor and the second sensor is the second state combination, adjust the opening degree of the electronic expansion valve based on the temperature difference and the adjustment coefficient; Wherein, the opening degree of the electronic expansion valve is positively correlated with the temperature difference.

6. The method according to claim 4 or 5, characterized in that The adjusting the opening degree of the electronic expansion valve based on the temperature difference and the states of the first sensor and the second sensor includes: When the combination of the opening states of the first sensor and the second sensor changes from the second state combination to the first state combination, adjust the opening of the electronic expansion valve to the maximum opening and increase the adjustment coefficient until, after the combination of the opening states of the first sensor and the second sensor changes from the first state combination to the second state combination, adjust the opening of the electronic expansion valve based on the adjusted adjustment coefficient.

7. The method according to claim 4 or 5, characterized in that, The adjustment of the opening of the electronic expansion valve based on the temperature difference and the states of the first sensor and the second sensor includes: When the combination of the opening states of the first sensor and the second sensor changes from the second state combination to the third state combination, reduce the opening of the electronic expansion valve based on the current opening and reduce the adjustment coefficient until, after the combination of the opening states of the first sensor and the second sensor changes from the third state combination to the second state combination, adjust the opening of the electronic expansion valve based on the adjusted adjustment coefficient.

8. An air conditioner compressor oil return amount control device, characterized in that, Applied to an air conditioner, the device includes: An acquisition module for acquiring the operating state parameters of the air conditioner; A calculation module for calculating the temperature difference based on the operating state parameters; A control module for adjusting the opening of the electronic expansion valve based on the temperature difference and the combination of the opening states of the first sensor and the second sensor; Wherein, in the cooling mode, the temperature difference is the difference between the actual evaporation temperature and the target evaporation temperature; in the heating mode, the temperature difference is the difference between the actual condensation temperature and the target condensation temperature; the electronic expansion valve is: an electronic expansion valve for adjusting the oil return amount provided between the oil separator and the gas-liquid separator of the air conditioner; the first sensor is an oil level sensor for detecting the low oil level provided inside the compressor of the air conditioner; the second sensor is an oil level sensor for detecting the high oil level provided inside the compressor of the air conditioner.

9. An air conditioner, characterized in that, It includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the steps of the method for controlling the oil return amount of the air conditioner compressor according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, Stored thereon is a computer program, and when the computer program is executed by a processor, it implements the steps of the method for controlling the oil return amount of the air conditioner compressor according to any one of claims 1 to 7.

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