Compressor oil return control method, system, refrigeration equipment and storage medium

Abstract

The present application relates to a compressor oil return control method, system, refrigeration equipment, and storage medium. The method includes: accurately determining the compressor's oil return demand state based on compressor operating parameters, thereby controlling the operating parameters of a centrifugal oil separator in accordance with the oil return demand state, enabling the centrifugal oil separator to supply oil to the compressor in accordance with the oil return demand state, thereby controlling the compressor's oil return volume, and resolving the problem that existing oil separators cannot control the oil volume in conjunction with the compressor's operating state.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration systems, and in particular to a compressor oil return control method, system, refrigeration equipment, and storage medium. Background Art

[0002] Under low-temperature and high-frequency operating conditions of the refrigeration system, the existing oil separator returns oil to the compressor in a fixed manner, without considering the actual oil return situation of the compressor and the actual demand of the compressor for lubricating oil. This can easily cause insufficient or excessive oil return from the compressor, thereby reducing the service life of the compressor. Summary of the Invention

[0003] The present application provides a compressor oil return control method, system, refrigeration equipment and storage medium to solve the problem that the existing oil separator cannot control the oil amount in combination with the operating status of the compressor.

[0004] In a first aspect, the present application provides a compressor oil return control method, the method comprising:

[0005] Obtaining compressor operating parameters within a first preset time period;

[0006] determining a current temperature difference between the inside and outside of the compressor according to the compressor operating parameters, and further determining an oil return demand state of the compressor according to the current temperature difference and a correlation relationship, wherein the correlation relationship indicates that a greater temperature difference corresponds to a smaller oil return demand;

[0007] The operating parameters of the centrifugal oil separator are controlled according to the oil return demand state, so that the oil return amount provided by the centrifugal oil separator matches the oil return demand state.

[0008] Optionally, the compressor operating parameters include a compressor outlet pressure and an oil temperature in the compressor, and determining a current temperature difference between the inside and outside of the compressor based on the compressor operating parameters, and then determining the oil return demand state of the compressor based on the current temperature difference and a correlation relationship, includes:

[0009] converting the compressor outlet pressure into a compressor outlet temperature;

[0010] According to a current temperature difference between the oil temperature in the compressor and the compressor outlet temperature, the oil return demand state of the compressor is determined according to the current temperature difference and the correlation relationship.

[0011] Optionally, the determining the oil return requirement state of the compressor according to a current temperature difference between the oil temperature in the compressor and the compressor outlet temperature and the associated relationship includes at least one of the following:

[0012] When the current temperature difference is greater than or equal to a first preset temperature difference, determining that the oil return demand state of the compressor is an oil-free state;

[0013] When the current temperature difference is less than the first preset temperature difference and greater than or equal to a second preset temperature difference, determining that the oil return demand state of the compressor is a mild oil shortage state, wherein the second preset temperature difference is less than the first preset temperature difference;

[0014] When the current temperature difference is less than the second preset temperature difference and greater than or equal to a third preset temperature difference, determining that the oil return demand state of the compressor is a moderate oil shortage state, wherein the third preset temperature difference is less than the second preset temperature difference;

[0015] When the current temperature difference is less than the third preset temperature difference, it is determined that the oil return demand state of the compressor is a severe oil shortage state.

[0016] Optionally, controlling the operating parameters of the centrifugal oil separator according to the oil return demand state includes at least one of the following:

[0017] When the oil return demand state is an oil-free state, the motor speed of the centrifugal oil separator is controlled to be a first speed, the opening of the first electric proportional valve is controlled to be a first preset opening, and the opening of the second electric proportional valve is controlled to be a second preset opening, wherein the first electric proportional valve is installed on the connecting pipe between the first oil storage tank of the centrifugal oil separator and the compressor, and the second electric proportional valve is installed on the connecting pipe between the second oil storage tank and the first oil storage tank, and the second preset opening is smaller than the first preset opening;

[0018] When the oil return demand state is a mild oil shortage state, the motor speed of the centrifugal oil separator is controlled to be a second speed, the opening of the first electric proportional valve is controlled to be a third preset opening, and the opening of the second electric proportional valve is controlled to be a fourth preset opening, wherein the third preset opening is greater than the first preset opening, the fourth preset opening is greater than or equal to the second preset opening, and the second speed is greater than the first speed;

[0019] When the oil return demand state is a moderate oil shortage state, the motor speed of the centrifugal oil separator is controlled to be a third speed, the opening of the first electric proportional valve is controlled to be a fifth preset opening, and the opening of the second electric proportional valve is controlled to be a sixth preset opening, wherein the fifth preset opening is greater than the third preset opening, the sixth preset opening is greater than or equal to the fourth preset opening, and the third speed is greater than the second speed;

[0020] When the oil return demand state is a severe oil shortage state, the motor speed of the centrifugal oil separator is controlled to be the fourth speed, the opening of the first electric proportional valve is the seventh preset opening, and the opening of the second electric proportional valve is the eighth preset opening, wherein the seventh preset opening is greater than the fifth preset opening, the eighth preset opening is greater than or equal to the sixth preset opening, and the fourth speed is greater than or equal to the third speed.

[0021] Optionally, when the oil return demand state is a severe oil shortage state, controlling the motor speed of the centrifugal oil separator to be a fourth speed, the opening of the first electric proportional valve to be a seventh preset opening, and the opening of the second electric proportional valve to be an eighth preset opening includes:

[0022] When the oil return demand state is a severe oil shortage state, determining the eighth preset opening degree according to the product of the current temperature difference and a preset opening coefficient;

[0023] The motor speed of the centrifugal oil separator is controlled to be the fourth speed, the opening of the first electric proportional valve is controlled to be the seventh preset opening, and the opening of the second electric proportional valve is controlled to be the eighth preset opening.

[0024] Optionally, after controlling the operating parameters of the centrifugal oil separator according to the oil return demand state, the method further includes:

[0025] Within a second preset time period after the compressor is shut down, controlling the motor speed of the centrifugal oil separator to be the first speed, the opening of the first electric proportional valve to be the first preset opening, and the second electric proportional valve to be in a closed state;

[0026] When the shutdown time of the compressor reaches the second preset time, the motor of the centrifugal oil separator is controlled to stop rotating and the first electric proportional valve is in a closed state.

[0027] Optionally, before obtaining the compressor operating parameters within the first preset time period, the method further includes:

[0028] Obtaining oil quality detection data from an oil quality sensor in the centrifugal oil separator;

[0029] When the oil quality detection data exceeds a preset data range, determining a tenth preset opening according to a ratio of the oil quality detection data to a preset aging coefficient;

[0030] Controlling the opening of the first electric proportional valve of the centrifugal oil separator to a ninth preset opening and the opening of the second electric proportional valve to the tenth preset opening according to a specified time period;

[0031] When the designated time period ends, the opening of the first electric proportional valve of the centrifugal oil separator is controlled to be a first preset opening, and the second electric proportional valve is in a closed state until the compressor starts.

[0032] In a second aspect, the present application provides a compressor oil return control system, the compressor oil return control system comprising a compressor oil return control device and a centrifugal oil separator connected to each other, the compressor oil return control device being used to control the centrifugal oil separator to implement the compressor oil return control method as described in any one of the above items;

[0033] The centrifugal oil separator includes a separation body, an adsorption membrane is provided on the inner wall of the separation body, a refrigerant inlet and a refrigerant outlet are provided on the top of the separation body, a refrigerant inlet pipe is vertically arranged through the refrigerant inlet, a rotating sleeve is provided in the separation body, a plurality of through holes are evenly distributed on the refrigerant inlet pipe and the rotating sleeve, the rotating sleeve is sleeved on the periphery of the refrigerant inlet pipe, a motor is provided at the bottom of the rotating sleeve, an oil outlet is provided at the bottom of the separation body, the oil outlet is connected to a first oil storage tank, the first oil storage tank is connected to a compressor through a first electric proportional valve, the first oil storage tank is connected to a second oil storage tank through a second electric proportional valve, an outlet is provided on the surface of the separation body, and the motor is connected to the compressor oil return control device through the outlet.

[0034] In a third aspect, the present application provides a refrigeration device, which includes the compressor oil return control system as described above.

[0035] In a fourth aspect, the present application further provides a computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the above-mentioned compressor oil return control method.

[0036] The above-mentioned technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: the method provided by the embodiment of the present application obtains the operating parameters of the compressor within a first preset time period; determines the oil return demand state of the compressor based on the compressor operating parameters; and controls the operating parameters of the centrifugal oil separator based on the oil return demand state so that the return oil amount provided by the centrifugal oil separator matches the oil return demand state.

[0037] Based on the above method, the oil return demand state of the compressor is accurately determined according to the compressor operating parameters, and the operating parameters of the centrifugal oil separator are controlled according to the oil return demand state, so that the centrifugal oil separator can supply oil to the compressor according to the oil return demand state, thereby realizing the control of the compressor return oil amount, solving the problem that the existing oil separator cannot control the oil amount in combination with the compressor operating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0041] Figure 1 A schematic structural diagram of a compressor oil return control system provided in an embodiment of the present application;

[0042] Figure 2 A schematic structural diagram of a centrifugal oil separator provided in an embodiment of the present application;

[0043] Figure 3 A flow chart of a compressor oil return control method provided in an embodiment of the present application;

[0044] Figure 4 A schematic diagram of the compressor oil return control process provided in an embodiment of the present application;

[0045] Figure 5 This is a structural block diagram of a compressor oil return control device provided in an embodiment of the present application;

[0046] Figure 6 A schematic diagram of the internal structure of a refrigeration device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0049] Figure 1 FIG. 1 is a schematic diagram of the structure of a compressor oil return control system in one embodiment. Figure 1 The compressor oil return control system includes a compressor oil return control device 110 and a centrifugal oil separator 120 that are interconnected. The compressor oil return control device 110 is used to control the centrifugal oil separator 120 to provide the compressor with an oil volume that is consistent with the compressor operating state; the compressor oil return control system is applied to refrigeration equipment, which includes refrigerators, freezers, cold storage, refrigerated trucks, etc.

[0050] Reference Figure 2 The centrifugal oil separator 120 includes a separation body 121, an adsorption film 122 is provided on the inner wall of the separation body 121, a refrigerant inlet 123 and a refrigerant outlet 124 are provided on the top of the separation body 121, a refrigerant inlet pipe 125 is vertically provided through the refrigerant inlet 123, a rotating sleeve 126 is provided in the separation body 121, and a plurality of through holes are evenly distributed on the refrigerant inlet pipe 125 and the rotating sleeve 126, and the rotating sleeve 126 is sleeved on the refrigerant inlet pipe 125. On the periphery, a motor 127 is provided at the bottom of the rotating sleeve 126, and an oil outlet is provided at the bottom of the separation body, which is connected to the first oil storage tank 128. The first oil storage tank 128 is connected to the compressor through a first electric proportional valve 129, and the first oil storage tank 128 is connected to the second oil storage tank 131 through a second electric proportional valve 130. An outlet 132 is provided on the surface of the separation body, and the motor 127 is connected to the compressor oil return control device 110 through the outlet 132.

[0051] Specifically, the refrigerant-oil mixture enters the refrigerant inlet pipe 125 through the refrigerant inlet 123. The through-holes in the refrigerant inlet pipe 125 are symmetrically arranged in rows. For example, the refrigerant inlet pipe 125 is provided with two symmetrically arranged rows of through-holes, with the row arrangement direction extending along the length of the refrigerant inlet pipe 125. The rotating sleeve 126, driven by the motor 127, rotates at high speed. The refrigerant and oil have different densities. The high-speed rotation generates centrifugal force, separating the denser oil from the refrigerant-oil mixture. The oil is then ejected and adsorbed onto the adsorption membrane 122. The oil droplets on the adsorption membrane 122 gather into droplets and drip onto the bottom of the separation body, where they are recovered through the oil outlet into the first oil storage tank 128. The centrifugal oil separator 120 improves the separation of the refrigerant-oil mixture, separating as much lubricating oil as possible.

[0052] In one embodiment, Figure 3 A flow chart of a compressor oil return control method in one embodiment, referring to Figure 3 , provides a compressor oil return control method. This embodiment mainly applies this method to the above Figure 1 Taking the compressor oil return control device 110 in FIG. 1 as an example, the compressor oil return control method specifically includes the following steps:

[0053] Step S210: Obtaining compressor operating parameters within a first preset time period.

[0054] Specifically, the first preset time length can be customized according to the control requirements. For example, the first preset time length is 3 seconds, 5 seconds, 10 seconds, 1 minute, 3 minutes, etc. In this embodiment, the first preset time length is 5 seconds, and the compressor operating parameters within 5 seconds are obtained. The compressor operating parameters are used to reflect the operating status of the compressor. The compressor operating parameters specifically include speed, oil temperature in the compressor, compressor suction pressure, compressor outlet pressure, compressor suction temperature, compressor exhaust temperature, etc.

[0055] In step S220, the current temperature difference between the inside and outside of the compressor is determined based on the compressor operating parameters, and the oil return demand state of the compressor is determined based on the current temperature difference and a correlation relationship, wherein the correlation relationship indicates that the greater the temperature difference, the smaller the corresponding oil return demand.

[0056] Specifically, the operating state of the compressor and the demand state for lubricating oil, that is, the oil return demand state, can be determined based on the compressor operating parameters. The oil return demand state is used to indicate the degree or amount of demand for lubricating oil by the compressor.

[0057] Step S230 , controlling the operating parameters of the centrifugal oil separator 120 according to the oil return demand state, so that the oil return amount provided by the centrifugal oil separator 120 meets the oil return demand state.

[0058] Specifically, the operating parameters of the centrifugal oil separator 120 are adjusted according to the oil return demand state, so that the centrifugal oil separator 120 can supply oil to the compressor according to the oil return demand state, thereby realizing the control of the compressor return oil amount, avoiding the problem of too much or too little compressor return oil under the current operating state, and solving the problem that the existing oil separator cannot control the oil amount in combination with the compressor operating state.

[0059] In one embodiment, the compressor operating parameters include compressor outlet pressure and compressor internal oil temperature. Determining a current temperature difference between the inside and outside of the compressor based on the compressor operating parameters, and then determining the oil return demand state of the compressor based on the current temperature difference and a correlation relationship, includes:

[0060] converting the compressor outlet pressure into a compressor outlet temperature;

[0061] According to the current temperature difference between the oil temperature in the compressor and the compressor outlet temperature, the oil return demand state of the compressor is determined according to the current temperature difference and the correlation relationship. In this embodiment, the correlation relationship can be expressed by a mathematical formula or a table. Considering that the actual demand for accuracy is not particularly high, it can also be directly processed in segments, which will be described below as an example.

[0062] Specifically, there is a corresponding relationship between the compressor outlet pressure and the compressor outlet temperature, such as a pressure-temperature chart. Based on this chart, the compressor outlet temperature corresponding to the compressor outlet pressure can be found. Alternatively, the compressor outlet temperature can be calculated using the Antoine equation. The Antoine equation is: , where A, B, and C are Antoine constants, and P is the saturated vapor pressure. Different types of refrigerants correspond to different Antoine constants. Substituting the compressor outlet pressure as P into the above formula and determining the Antoine constant based on the refrigerant type, the compressor outlet temperature can be calculated.

[0063] The oil return demand state of the compressor is determined based on the current temperature difference between the oil temperature in the compressor and the compressor outlet temperature. The oil temperature in the compressor is recorded as , the compressor outlet temperature is recorded as , the current temperature difference is , The larger the value, the more lubricating oil is in the compressor. The smaller the temperature, the less lubricating oil there is in the compressor. Therefore, the oil return demand of the compressor under the current operating state can be accurately determined based on the temperature difference, so that the oil return amount of the compressor can be accurately controlled in the future.

[0064] In one embodiment, determining the oil return requirement state of the compressor based on the current temperature difference between the oil temperature in the compressor and the compressor outlet temperature includes at least one of the following:

[0065] When the current temperature difference is greater than or equal to a first preset temperature difference, determining that the oil return demand state of the compressor is an oil-free state;

[0066] When the current temperature difference is less than the first preset temperature difference and greater than or equal to a second preset temperature difference, determining that the oil return demand state of the compressor is a mild oil shortage state, wherein the second preset temperature difference is less than the first preset temperature difference;

[0067] When the current temperature difference is less than the second preset temperature difference and greater than or equal to a third preset temperature difference, determining that the oil return demand state of the compressor is a moderate oil shortage state, wherein the third preset temperature difference is less than the second preset temperature difference;

[0068] When the current temperature difference is less than the third preset temperature difference, it is determined that the oil return demand state of the compressor is a severe oil shortage state.

[0069] Specifically, the first preset temperature difference, the second preset temperature difference, and the third preset temperature difference can be customized according to actual application requirements, but the first preset temperature difference is greater than the second preset temperature difference, and the second preset temperature difference is greater than the third preset temperature difference.

[0070] Reference Figure 4 In this embodiment, the first preset temperature difference is 5°C, the second preset temperature difference is 2°C, and the third preset temperature difference is 0°C. When , it indicates that there is sufficient lubricating oil in the compressor and there is no oil shortage, so the oil return demand state is determined to be the oil shortage state.

[0071] exist When , it indicates that the lubricating oil in the compressor is slightly insufficient, so the oil return demand state is determined to be a slight oil shortage state.

[0072] exist When , it means that the compressor is short of oil. Therefore, the oil return demand state is determined to be a moderate oil shortage state.

[0073] exist When , it indicates that the lubricating oil in the compressor is seriously insufficient, so the oil return demand state is determined to be a severe oil shortage state.

[0074] Based on the different numerical ranges of the above temperature difference, the current oil return demand status of the compressor can be accurately determined.

[0075] In one embodiment, the operating parameters of the centrifugal oil separator 120 are controlled according to the oil return demand state, including at least one of the following:

[0076] When the oil return demand state is an oil-free state, the motor speed of the centrifugal oil separator is controlled to be a first speed, the opening of the first electric proportional valve 129 is controlled to be a first preset opening, and the opening of the second electric proportional valve 130 is controlled to be a second preset opening, wherein the first electric proportional valve 129 is installed on the connecting pipe between the centrifugal oil separator 120 and the compressor, and the second electric proportional valve 130 is installed on the connecting pipe between the oil storage tank and the first electric proportional valve 129, and the second preset opening is smaller than the first preset opening;

[0077] When the oil return demand state is a mild oil shortage state, the motor speed of the centrifugal oil separator is controlled to be a second speed, the opening of the first electric proportional valve 129 is controlled to be a third preset opening, and the opening of the second electric proportional valve 130 is controlled to be a fourth preset opening, wherein the third preset opening is greater than the first preset opening, the fourth preset opening is greater than or equal to the second preset opening, and the second speed is greater than the first speed;

[0078] When the oil return demand state is a moderate oil shortage state, the motor speed of the centrifugal oil separator is controlled to be a third speed, the opening of the first electric proportional valve 129 is a fifth preset opening, and the opening of the second electric proportional valve 130 is a sixth preset opening, wherein the fifth preset opening is greater than the third preset opening, the sixth preset opening is greater than or equal to the fourth preset opening, and the third speed is greater than the second speed;

[0079] When the oil return demand state is a severe oil shortage state, the motor speed of the centrifugal oil separator is controlled to be the fourth speed, the opening of the first electric proportional valve 129 is the seventh preset opening, and the opening of the second electric proportional valve 130 is the eighth preset opening, wherein the seventh preset opening is greater than the fifth preset opening, the eighth preset opening is greater than or equal to the sixth preset opening, and the fourth speed is greater than or equal to the third speed.

[0080] Specifically, the first speed is less than the second speed, the second speed is less than the third speed, and the fourth speed is greater than or equal to the third speed. The faster the motor speed of the motor 127, the higher the oil separation efficiency of the centrifugal oil separator 120. The first speed is calculated based on centrifugal force using a differential centrifugation method. In this embodiment, the first speed R0 is 3000RPM, the second speed is 2*R0, the third speed is 3*R0, and the fourth speed is equal to the third speed. The motor speed increases with the increasing degree of oil deficiency.

[0081] The first preset opening is greater than the second preset opening, the third preset opening is greater than the first preset opening, the fifth preset opening is greater than the third preset opening, and the seventh preset opening is greater than or equal to the fifth preset opening. In this embodiment, the first preset opening is 25%, the second preset opening is 0, the third preset opening is 50%, the fourth preset opening is 0, the fifth preset opening is 100%, the sixth preset opening is 0, the seventh preset opening is 100%, and the eighth preset opening is greater than the second preset opening.

[0082] Reference Figure 4 When the oil return demand state is a state where there is no oil shortage, the motor 127 of the centrifugal oil separator 120 is controlled to operate at the first speed R0 to slowly separate the refrigerant and the lubricating oil, and the opening of the first electric proportional valve 129 is opened to the first preset opening of 25%, and the opening of the second electric proportional valve 130 is set to 0, that is, only the lubricating oil dripping from the separation body 121 to the first oil storage tank 128 is used, and there is no need to use the lubricating oil stored in the second oil storage tank 131. A small amount of lubricating oil is provided to the compressor through the first electric proportional valve 129.

[0083] When the oil return demand state is a mild oil shortage state, the motor 127 in the centrifugal oil separator 120 is controlled to operate at the second speed 2*R0 to speed up the separation of refrigerant and lubricating oil, and the opening of the first electric proportional valve 129 is opened to the third preset opening 50%, and the opening of the second preset electric proportional valve is set to 0. Only the lubricating oil dripping from the separation body 121 to the first oil storage tank 128 is still used, and there is no need to use the lubricating oil stored in the second oil storage tank 131. More lubricating oil is provided to the compressor through the first electric proportional valve 129.

[0084] When the oil return demand state is a moderate oil shortage state, the motor 127 in the centrifugal oil separator 120 is controlled to run quickly according to the third speed 3*R0, and the refrigerant and lubricating oil are separated at the maximum speed to improve the oil separation efficiency. The opening of the first electric proportional valve 129 is opened to the fifth preset opening of 100%, and the opening of the second electric proportional valve 130 is set to 0. By opening the first electric proportional valve 129 to the maximum, the lubricating oil in the first oil storage tank 128 is provided to the compressor to the maximum extent.

[0085] When the oil return demand state is a severe oil shortage state, the motor 127 in the centrifugal oil separator 120 is controlled to run quickly at the fourth speed 3*R0 to separate the refrigerant and the lubricating oil at the maximum speed, and the opening of the first electric proportional valve 129 is opened to the fifth preset opening 100%, and the opening of the second electric proportional valve 130 is set to the eighth preset opening. At this time, the lubricating oil in the first oil storage tank 128 and the second oil storage tank 131 is used to supply oil to the compressor at the same time to avoid insufficient oil dripping from the separation body 121 into the first oil storage tank 128. After the lubricating oil in the second oil storage tank 131 is transferred to the first oil storage tank 128 by opening the second electric proportional valve 130, it is transferred to the compressor through the first electric proportional valve 129 to quickly increase the oil amount in the compressor.

[0086] When the oil return demand state is any oil shortage state, after controlling the operating parameters of the centrifugal oil separator 120 according to the oil return demand state, the compressor operating parameters are re-acquired and the oil return demand state is re-determined until the oil return demand state is restored to the oil non-shortage state, and the centrifugal oil separator 120 is controlled to perform normal operation according to the oil non-shortage state.

[0087] Different control strategies are adopted to control the centrifugal oil separator 120 according to different oil return demand states, thereby controlling the oil return amount of the compressor.

[0088] In one embodiment, when the oil return demand state is a severe oil shortage state, controlling the motor speed of the centrifugal oil separator to be a fourth speed, the opening of the first electric proportional valve 129 to be a seventh preset opening, and the opening of the second electric proportional valve 130 to be an eighth preset opening includes:

[0089] When the oil return demand state is a severe oil shortage state, determining the eighth preset opening degree according to the product of the current temperature difference and a preset opening coefficient;

[0090] The motor speed of the centrifugal oil separator is controlled to be the fourth speed, the opening of the first electric proportional valve 129 is controlled to be the seventh preset opening, and the opening of the second electric proportional valve 130 is controlled to be the eighth preset opening.

[0091] Specifically, when the oil return demand state is a severe oil shortage state, it is necessary to use the lubricating oil in the first oil storage tank 128 and the second oil storage tank 131 at the same time, and the second electric proportional valve 130 needs to be opened. The opening degree of the second electric proportional valve 130 is determined according to the product of the temperature difference and the preset opening coefficient. In this embodiment, the preset opening coefficient is 2%. The eighth preset opening is *2%, so as to accurately control the opening of the second electric proportional valve 130 according to the severity of the oil shortage, thereby accurately controlling the oil output of the second oil storage tank 131, to avoid excessive oil output causing the lubricating oil in the first oil storage tank 128 to flow back into the separation body 121, or to avoid insufficient oil output that cannot meet the compressor's demand for lubricating oil.

[0092] In one embodiment, after controlling the operating parameters of the centrifugal oil separator 120 according to the oil return demand state, the method further includes:

[0093] Within a second preset time period after the compressor is shut down, the motor speed of the centrifugal oil separator 120 is controlled to be the first speed, the opening of the first electric proportional valve 129 is controlled to be the first preset opening, and the second electric proportional valve 130 is in a closed state;

[0094] When the shutdown time of the compressor reaches the second preset time, the motor 127 of the centrifugal oil separator 120 is controlled to stop rotating and the first electric proportional valve 129 is in a closed state.

[0095] Specifically, refer to Figure 4 After controlling the operating parameters of the centrifugal oil separator according to the oil return demand state, if the compressor is in a shutdown state, the motor 127 of the centrifugal oil separator 120 is controlled to operate at the first speed within a second preset time after the compressor is shut down, and the opening of the first electric proportional valve 129 is opened to 25% of the first preset opening, and the second electric proportional valve 130 is closed. When the shutdown time of the compressor reaches the second preset time, the motor 127 of the centrifugal oil separator 120 is controlled to stop rotating and the first electric proportional valve 129 is turned off, that is, the centrifugal oil separator 120 is delayed in shutdown after the compressor is shut down, so that the centrifugal oil separator 120 can fully separate and recover the lubricating oil.

[0096] In one embodiment, before obtaining the compressor operating parameters within the first preset time period, the method further includes:

[0097] Obtaining oil quality detection data from an oil quality sensor in the centrifugal oil separator 120;

[0098] When the oil quality detection data exceeds a preset data range, determining a tenth preset opening according to a ratio of the oil quality detection data to a preset aging coefficient;

[0099] Controlling the opening of the first electric proportional valve 129 of the centrifugal oil separator to the ninth preset opening and the opening of the second electric proportional valve 130 to the tenth preset opening according to the specified time period;

[0100] When the designated time period ends, the opening of the first electric proportional valve 129 of the centrifugal oil separator is controlled to be a first preset opening, and the second electric proportional valve 130 is in a closed state until the compressor starts.

[0101] Specifically, refer to Figure 4 Before starting the compressor, oil quality detection data is obtained through the oil quality sensor to detect the aging degree of the lubricating oil in the first oil storage tank 128. The oil quality detection data is used to indicate the viscosity of the lubricating oil. The greater the viscosity, the more serious the aging degree. When the oil quality detection data exceeds the preset data range, a certain amount of new oil needs to be mixed to meet the operating requirements of the compressor. Therefore, it is necessary to open the second electric proportional valve 130 to add the new oil in the second oil storage tank 131 to the first oil storage tank 128 for mixing, and then transmit it to the compressor through the first electric proportional valve 129.

[0102] The opening of the second electric proportional valve 130 is the ratio of the oil quality test data to a preset aging coefficient. Different preset aging coefficients are used for different types of lubricating oil. In this embodiment, the preset aging coefficient is 25%. If the oil quality test data is N, then the corresponding tenth preset opening of the second electric proportional valve 130 is N / 25%. At this point, the opening of the first electric proportional valve 129 is the ninth preset opening. The ninth preset opening can be any value. In this embodiment, the ninth preset opening is set to 100%, i.e., the first electric proportional valve 129 is fully open to quickly increase the oil volume in the compressor.

[0103] At the end of the specified time, the opening of the first electric proportional valve 129 of the centrifugal oil separator is controlled to a first preset opening, and the second electric proportional valve 130 is closed. When the aging degree of the mixed oil after the new and old oils meet the operating requirements of the compressor, the addition of new oil to the first oil storage tank 128 is stopped to control the amount of new oil added. Subsequently, only the oil in the first oil storage tank 128 is used to supply the compressor until the compressor starts. This method ensures that the lubricating oil used at compressor startup meets the startup requirements, solving the problem of compressor damage caused by deterioration of oil quality after the unit has been idle for a long time.

[0104] Figure 3 and Figure 4 FIG. 1 is a flow chart of a compressor oil return control method in one embodiment. It should be understood that although Figure 3 and Figure 4 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 3 and Figure 4At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0105] In one embodiment, Figure 5 As shown, a compressor oil return control device 110 is provided, comprising:

[0106] An acquisition module 310 is configured to acquire operating parameters of a compressor within a first preset time period;

[0107] The processing module 320 is configured to determine the oil return demand state of the compressor according to the compressor operating parameters;

[0108] The control module 330 is configured to control the operating parameters of the centrifugal oil separator 120 according to the oil return demand state, so that the oil return amount provided by the centrifugal oil separator 120 meets the oil return demand state.

[0109] In one embodiment, the compressor operating parameters include compressor outlet pressure and compressor oil temperature, and the processing module 320 is further configured to:

[0110] converting the compressor outlet pressure into a compressor outlet temperature;

[0111] An oil return demand state of the compressor is determined according to a current temperature difference between the oil temperature in the compressor and the compressor outlet temperature.

[0112] In one embodiment, the processing module 320 is further configured to implement at least one of the following:

[0113] When the current temperature difference is greater than or equal to a first preset temperature difference, determining that the oil return demand state of the compressor is an oil-free state;

[0114] When the current temperature difference is less than the first preset temperature difference and greater than or equal to a second preset temperature difference, determining that the oil return demand state of the compressor is a mild oil shortage state, wherein the second preset temperature difference is less than the first preset temperature difference;

[0115] When the current temperature difference is less than the second preset temperature difference and greater than or equal to a third preset temperature difference, determining that the oil return demand state of the compressor is a moderate oil shortage state, wherein the third preset temperature difference is less than the second preset temperature difference;

[0116] When the current temperature difference is less than the third preset temperature difference, it is determined that the oil return demand state of the compressor is a severe oil shortage state.

[0117] In one embodiment, the control module 330 is further configured to implement at least one of the following:

[0118] When the oil return demand state is an oil-free state, the motor speed of the centrifugal oil separator is controlled to be a first speed, the opening of the first electric proportional valve 129 is controlled to be a first preset opening, and the opening of the second electric proportional valve 130 is controlled to be a second preset opening, wherein the first electric proportional valve 129 is installed on the connecting pipe between the centrifugal oil separator 120 and the compressor, and the second electric proportional valve 130 is installed on the connecting pipe between the oil storage tank and the first electric proportional valve 129, and the second preset opening is smaller than the first preset opening;

[0119] When the oil return demand state is a mild oil shortage state, the motor speed of the centrifugal oil separator is controlled to be a second speed, the opening of the first electric proportional valve 129 is controlled to be a third preset opening, and the opening of the second electric proportional valve 130 is controlled to be a fourth preset opening, wherein the third preset opening is greater than the first preset opening, the fourth preset opening is greater than or equal to the second preset opening, and the second speed is greater than the first speed;

[0120] When the oil return demand state is a moderate oil shortage state, the motor speed of the centrifugal oil separator is controlled to be a third speed, the opening of the first electric proportional valve 129 is a fifth preset opening, and the opening of the second electric proportional valve 130 is a sixth preset opening, wherein the fifth preset opening is greater than the third preset opening, the sixth preset opening is greater than or equal to the fourth preset opening, and the third speed is greater than the second speed;

[0121] When the oil return demand state is a severe oil shortage state, the motor speed of the centrifugal oil separator is controlled to be the fourth speed, the opening of the first electric proportional valve 129 is the seventh preset opening, and the opening of the second electric proportional valve 130 is the eighth preset opening, wherein the seventh preset opening is greater than the fifth preset opening, the eighth preset opening is greater than or equal to the sixth preset opening, and the fourth speed is greater than or equal to the third speed.

[0122] In one embodiment, the control module 330 is further configured to:

[0123] When the oil return demand state is a severe oil shortage state, determining the eighth preset opening degree according to the product of the current temperature difference and a preset opening coefficient;

[0124] The motor speed of the centrifugal oil separator is controlled to be the fourth speed, the opening of the first electric proportional valve 129 is controlled to be the seventh preset opening, and the opening of the second electric proportional valve 130 is controlled to be the eighth preset opening.

[0125] In one embodiment, the control module 330 is further configured to:

[0126] Within a second preset time period after the compressor is shut down, the motor speed of the centrifugal oil separator 120 is controlled to be the first speed, the opening of the first electric proportional valve 129 is controlled to be the first preset opening, and the second electric proportional valve 130 is in a closed state;

[0127] When the shutdown time of the compressor reaches the second preset time, the motor 127 of the centrifugal oil separator 120 is controlled to stop rotating and the first electric proportional valve 129 is in a closed state.

[0128] In one embodiment, the control module 330 is further configured to:

[0129] Obtaining oil quality detection data from an oil quality sensor in the centrifugal oil separator 120;

[0130] When the oil quality detection data exceeds a preset data range, determining a tenth preset opening according to a ratio of the oil quality detection data to a preset aging coefficient;

[0131] Controlling the opening of the first electric proportional valve 129 of the centrifugal oil separator to the ninth preset opening and the opening of the second electric proportional valve 130 to the tenth preset opening according to the specified time period;

[0132] When the designated time period ends, the opening of the first electric proportional valve 129 of the centrifugal oil separator is controlled to be a first preset opening, and the second electric proportional valve 130 is in a closed state until the compressor starts.

[0133] like Figure 6 As shown, an embodiment of the present application provides a refrigeration device, including a processor 711, a communication interface 712, a memory 713 and a communication bus 714, wherein the processor 711, the communication interface 712, and the memory 713 communicate with each other through the communication bus 714;

[0134] Memory 713, for storing computer programs;

[0135] The processor 711 is configured to implement the compressor oil return control method provided by any one of the aforementioned method embodiments when executing the program stored in the memory 713 .

[0136] Those skilled in the art will understand that Figure 6The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the refrigeration equipment to which the solution of the present application is applied. The specific refrigeration equipment may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0137] In one embodiment, the compressor oil return control system provided by the present application can be implemented in the form of a computer program. The computer program can be used in Figure 6 The memory of the refrigeration device can store various program modules constituting the compressor oil return control device 110, such as, Figure 5 The acquisition module 310, processing module 320 and control module 330 are shown. The computer program composed of various program modules enables the processor to execute the compressor oil return control method of each embodiment of the present application described in this specification.

[0138] Figure 6 The refrigeration equipment shown can be Figure 5 The acquisition module 310 in the illustrated compressor oil return control system acquires compressor operating parameters within a first preset time period. The refrigeration equipment can determine the compressor's oil return requirement based on the compressor operating parameters through the processing module 320. The refrigeration equipment can control the operating parameters of the centrifugal oil separator 120 based on the oil return requirement through the control module 330, so that the return oil volume provided by the centrifugal oil separator 120 meets the oil return requirement.

[0139] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the compressor oil return control method provided by any of the aforementioned method embodiments is implemented.

[0140] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected to achieve the objectives of this embodiment based on actual needs.

[0141] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software and a general hardware platform, or alternatively, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the relevant technology, 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, a magnetic disk, or an optical disk, and includes instructions for enabling a refrigeration device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or portions thereof.

[0142] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative methods may be used.

[0143] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A compressor oil return control method, characterized in that: The method comprises: Obtaining compressor operating parameters within a first preset time period; determining a current temperature difference between the inside and outside of the compressor according to the compressor operating parameters, and further determining an oil return demand state of the compressor according to the current temperature difference and a correlation relationship, wherein the correlation relationship indicates that a greater temperature difference corresponds to a smaller oil return demand; controlling the operating parameters of the centrifugal oil separator according to the oil return demand state so that the oil return amount provided by the centrifugal oil separator matches the oil return demand state; The compressor operating parameters include the compressor outlet pressure and the compressor internal oil temperature. Determining the current temperature difference between the inside and outside of the compressor based on the compressor operating parameters, and then determining the oil return demand state of the compressor based on the current temperature difference and a correlation relationship, includes: converting the compressor outlet pressure into a compressor outlet temperature; According to a current temperature difference between the oil temperature in the compressor and the compressor outlet temperature, the oil return demand state of the compressor is determined according to the current temperature difference and the correlation relationship.

2. The method according to claim 1, characterized in that The determining, based on a current temperature difference between the oil temperature in the compressor and the compressor outlet temperature, and based on the current temperature difference and the correlation relationship, of the oil return requirement state of the compressor includes at least one of the following: When the current temperature difference is greater than or equal to a first preset temperature difference, determining that the oil return demand state of the compressor is an oil-free state; When the current temperature difference is less than the first preset temperature difference and greater than or equal to a second preset temperature difference, determining that the oil return demand state of the compressor is a mild oil shortage state, wherein the second preset temperature difference is less than the first preset temperature difference; When the current temperature difference is less than the second preset temperature difference and greater than or equal to a third preset temperature difference, determining that the oil return demand state of the compressor is a moderate oil shortage state, wherein the third preset temperature difference is less than the second preset temperature difference; When the current temperature difference is less than the third preset temperature difference, it is determined that the oil return demand state of the compressor is a severe oil shortage state.

3. The method according to claim 2, characterized in that The controlling of the operating parameters of the centrifugal oil separator according to the oil return demand state includes at least one of the following: When the oil return demand state is an oil-free state, the motor speed of the centrifugal oil separator is controlled to be a first speed, the opening of the first electric proportional valve is controlled to be a first preset opening, and the opening of the second electric proportional valve is controlled to be a second preset opening, wherein the first electric proportional valve is installed on the connecting pipe between the first oil storage tank of the centrifugal oil separator and the compressor, and the second electric proportional valve is installed on the connecting pipe between the second oil storage tank and the first oil storage tank, and the second preset opening is smaller than the first preset opening; When the oil return demand state is a mild oil shortage state, the motor speed of the centrifugal oil separator is controlled to be a second speed, the opening of the first electric proportional valve is controlled to be a third preset opening, and the opening of the second electric proportional valve is controlled to be a fourth preset opening, wherein the third preset opening is greater than the first preset opening, the fourth preset opening is greater than or equal to the second preset opening, and the second speed is greater than the first speed; When the oil return demand state is a moderate oil shortage state, the motor speed of the centrifugal oil separator is controlled to be a third speed, the opening of the first electric proportional valve is controlled to be a fifth preset opening, and the opening of the second electric proportional valve is controlled to be a sixth preset opening, wherein the fifth preset opening is greater than the third preset opening, the sixth preset opening is greater than or equal to the fourth preset opening, and the third speed is greater than the second speed; When the oil return demand state is a severe oil shortage state, the motor speed of the centrifugal oil separator is controlled to be the fourth speed, the opening of the first electric proportional valve is the seventh preset opening, and the opening of the second electric proportional valve is the eighth preset opening, wherein the seventh preset opening is greater than the fifth preset opening, the eighth preset opening is greater than or equal to the sixth preset opening, and the fourth speed is greater than or equal to the third speed.

4. The method according to claim 3, characterized in that When the oil return demand state is a severe oil shortage state, controlling the motor speed of the centrifugal oil separator to be a fourth speed, the opening of the first electric proportional valve to be a seventh preset opening, and the opening of the second electric proportional valve to be an eighth preset opening, comprises: When the oil return demand state is a severe oil shortage state, determining the eighth preset opening degree according to the product of the current temperature difference and a preset opening coefficient; The motor speed of the centrifugal oil separator is controlled to be the fourth speed, the opening of the first electric proportional valve is controlled to be the seventh preset opening, and the opening of the second electric proportional valve is controlled to be the eighth preset opening.

5. The method according to claim 4, characterized in that After controlling the operating parameters of the centrifugal oil separator according to the oil return demand state, the method further includes: Within a second preset time period after the compressor is shut down, controlling the motor speed of the centrifugal oil separator to be the first speed, the opening of the first electric proportional valve to be the first preset opening, and the second electric proportional valve to be in a closed state; When the shutdown time of the compressor reaches the second preset time, the motor of the centrifugal oil separator is controlled to stop rotating and the first electric proportional valve is in a closed state.

6. The method according to claim 4, characterized in that Before obtaining the compressor operating parameters within the first preset time period, the method further includes: Obtaining oil quality detection data from an oil quality sensor in the centrifugal oil separator; When the oil quality detection data exceeds a preset data range, determining a tenth preset opening according to a ratio of the oil quality detection data to a preset aging coefficient; Controlling the opening of the first electric proportional valve of the centrifugal oil separator to a ninth preset opening and the opening of the second electric proportional valve to the tenth preset opening according to a specified time period; When the designated time period ends, the opening of the first electric proportional valve of the centrifugal oil separator is controlled to be a first preset opening, and the second electric proportional valve is in a closed state until the compressor starts.

7. A compressor oil return control system, characterized in that: The compressor oil return control system comprises a compressor oil return control device and a centrifugal oil separator connected to each other, wherein the compressor oil return control device is used to control the centrifugal oil separator to implement the compressor oil return control method according to any one of claims 1 to 6; The centrifugal oil separator includes a separation body, an adsorption membrane is provided on the inner wall of the separation body, a refrigerant inlet and a refrigerant outlet are provided on the top of the separation body, a refrigerant inlet pipe is vertically arranged through the refrigerant inlet, a rotating sleeve is provided in the separation body, a plurality of through holes are evenly distributed on the refrigerant inlet pipe and the rotating sleeve, the rotating sleeve is sleeved on the periphery of the refrigerant inlet pipe, a motor is provided at the bottom of the rotating sleeve, an oil outlet is provided at the bottom of the separation body, the oil outlet is connected to a first oil storage tank, the first oil storage tank is connected to a compressor through a first electric proportional valve, the first oil storage tank is connected to a second oil storage tank through a second electric proportional valve, an outlet is provided on the surface of the separation body, and the motor is connected to the compressor oil return control device through the outlet.

8. A refrigeration device, characterized in that: The refrigeration equipment includes the compressor oil return control system according to claim 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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