A heat exchanger oil content control and adjustment device

Abstract

The present invention discloses a heat exchanger oil content control and adjustment device, and relates to the technical field of heat exchanger oil content detection. The present invention includes an adjustment device, and a control test system communicating with the adjustment device; the adjustment device includes an air conditioning component and a control adjustment component; the air conditioning component includes an auxiliary compressor, and a condensing heat exchanger, an electronic expansion valve, and an evaporating heat exchanger connected in series with the compressor in sequence through a refrigerant circulation pipeline; the control test system includes a main control module, and an adjustment module, a monitoring module, an analysis module, and a decision module communicating with the compressor; the main control module is used to feed back the operating status data of each component of the adjustment device to a display interface, and control the operating status of each component through commands of other modules in the control test system. The test device of the present invention has a simple structure, accurate, reliable, and fast control, and can stably control the working conditions of different oil contents for a long time, thereby ensuring the authenticity and repeatability of the test results.

Description

Technical Field

[0001] The invention belongs to the technical field of oil content detection of heat exchangers, and in particular relates to a heat exchanger oil content control and adjustment device. Background Art

[0002] In the air-conditioning system, because the mechanical moving parts of the compressor need to be lubricated, the refrigerant entering the heat exchanger inevitably contains a certain proportion of oil. The oil content will affect the heat exchange efficiency of the heat exchanger. In the past, the research on heat exchangers was relatively rough, and the oil content was relatively small and basically uncontrolled. With the continuous improvement of energy-saving requirements and the impact of industrial chain upgrades, especially the oil discharge volume of compressors for new energy vehicles is much larger than that of traditional compressors, the oil content in the refrigerant in the heat exchanger has increased significantly, and the oil content has become increasingly important to the heat exchange efficiency of the heat exchanger.

[0003] At present, the oil content detection equipment for heat exchangers in air-conditioning systems on the market still basically uses the previous conventional control mode, which cannot accurately control the oil content of the refrigerant in the heat exchanger, resulting in errors in the test results. It is also impossible to clearly understand the impact of the oil content on the heat exchange efficiency of the heat exchanger. A new test equipment is needed.

[0004] Existing heat exchanger oil content testing equipment cannot accurately control the refrigerant oil content in the heat exchanger, which affects the test error. Therefore, a heat exchanger oil content control and adjustment device is provided. Summary of the invention

[0005] The purpose of the present invention is to provide a heat exchanger oil content control and adjustment device to solve the problem that the existing heat exchanger oil content test equipment cannot accurately control the refrigerant oil content in the heat exchanger, affecting the test error; it can control and measure the oil content entering the heat exchanger test component, providing research conditions for developing and optimizing the heat exchange efficiency of the heat exchanger.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is a heat exchanger oil content control and adjustment device, comprising a regulating device and a control test system communicating with the regulating device; the regulating device comprises an air conditioning component and a control regulating component;

[0008] The air conditioning assembly includes an auxiliary compressor, and a condensing heat exchanger, an electronic expansion valve, and an evaporative heat exchanger connected in series with the auxiliary compressor through a refrigerant circulation pipeline in sequence, wherein the evaporative heat exchanger is connected to the auxiliary compressor through a refrigerant circulation pipeline;

[0009] The control and adjustment component includes an oil separator and a refrigerant flow meter, the refrigerant flow meter is installed on the refrigerant circulation pipeline between the electronic expansion valve and the refrigerant heat exchanger, the oil separator is installed between the auxiliary compressor and the condensing heat exchanger, and the oil separator is connected to the first sight glass, the circulating oil pump, the oil flow meter, the second sight glass and the electric regulating valve in sequence through the oil circulation pipeline, and the outlet of the electric regulating valve is respectively connected to two pneumatic on-off valves through the oil circulation pipeline, one of the pneumatic on-off valves is connected to the refrigerant circulation pipeline between the refrigerant flow meter and the condensing heat exchanger through the oil circulation pipeline, and the other pneumatic on-off valve is connected to the refrigerant circulation pipeline between the oil separator and the condensing heat exchanger through the oil circulation pipeline;

[0010] The control test system includes a main control module, and a regulating module, a monitoring module, an analysis module and a decision module that establish communication connections with the main control module;

[0011] Main control module: used to feed back the operating status data of each component of the regulating equipment to the display interface, and control the operating status of each component by controlling the commands of other modules in the test system;

[0012] Adjustment module: used to send query commands to the main control module according to the oil content parameters of the heat exchanger required by the tester, query the real-time oil circulation flow of the oil flow meter and the real-time refrigerant circulation flow of the refrigerant flow meter, and calculate the oil content according to the formula: , calculate the oil content of the heat exchanger, and issue commands to adjust the frequency and opening of the circulating oil pump to the main control module according to the oil content data of the heat exchanger, until the oil content meets the oil content parameters of the heat exchanger required by the tester;

[0013] Visual module: including industrial cameras respectively arranged above the sight glass of the two sight glasses, used to respectively shoot downward the visual images of the lubricating oil flowing inside the two sight glasses at the same time through the industrial cameras, and respectively process the visual images of the lubricating oil flowing inside the two sight glasses, distinguish the bubbles and lubricating oil inside the visual images, obtain the segmented images, and output them to the analysis module;

[0014] Analysis module: used to receive the segmented images processed during the flow of lubricating oil from the two sight glasses output by the visual module, and to infer the content of lubricating oil when passing through the two sight glasses according to the ratio of bubbles to lubricating oil in the preset segmented images, wherein the more bubbles occupy the area of ​​the segmented images, the less lubricating oil content; the content of lubricating oil in the regulating device is a fixed amount, and the remaining content of lubricating oil for the circulating oil pump is the content of lubricating oil passing through the first sight glass minus the content of lubricating oil passing through the second sight glass; finally, the remaining content of lubricating oil in the circulating oil pump is compared with the oil content parameter of the heat exchanger and output to the decision module;

[0015] Decision module: used to determine whether the oil content control adjustment result of the heat exchanger is accurate. If the sum of the remaining content of the lubricating oil in the circulating oil pump and the oil content data of the heat exchanger after the oil content parameter of the heat exchanger is converted is equal to the total amount of the lubricating oil, then the oil content control adjustment result is determined to be accurate. If the sum of the remaining content of the lubricating oil in the circulating oil pump and the oil content data of the heat exchanger after the oil content parameter of the heat exchanger is not equal to the total amount of the lubricating oil, then the oil content control adjustment result is determined to be inaccurate, and re-control and adjustment are performed.

[0016] Preferably, the oil inlet of the auxiliary compressor is connected to a capillary tube, one end of which is installed on the oil circulation pipeline between the circulating oil pump and the first sight glass; a bypass valve is connected in parallel to one side of the circulating oil pump.

[0017] Preferably, the main control module communicates with the regulating equipment to obtain various structural data and displays them on the display interface. The displayed content includes the oil circulation flow and refrigerant circulation flow of the oil flow meter and the refrigerant flow meter, and the visual images of the lubricating oil flow process inside the sight glass taken by two industrial cameras.

[0018] Preferably, the visual module uses an industrial camera to respectively shoot visual images of the lubricating oil flowing inside two sight glasses at the same time, including the following specific steps: two groups of industrial cameras simultaneously shoot multiple visual images of the two sight glasses within a period of time, respectively compare the two groups of several visual images, and select two visual images of the lubricating oil flowing stably inside the two sight glasses at the same time node for processing, wherein whether the flow is stable is determined based on the number of bubbles in each group of visual images, and the photos whose number of bubbles is obviously different from the rest of the visual images in the same group are eliminated; the two selected visual images are processed and output as segmented images to the analysis module;

[0019] Among them, a light box is installed above the sight glass, and the industrial camera is installed on the top of the light box. The light box is blocked by a blackout cloth to form a darker shooting environment. The industrial camera uses a flash to shoot.

[0020] Preferably, the processing of the two visual images includes the following specific steps: first, color model conversion is performed to convert the obtained RGB model visual image into an HSV model image. During the model conversion, the brightness factor in RGB needs to be separated, wherein the expressions of H, S, and V components are:

[0021] ;

[0022] ;

[0023] ;

[0024] In the formula: R, G, B are red, green, and blue values ​​respectively; H, S, and V are hue, saturation, and brightness component values ​​respectively;

[0025] Randomly, while processing the image, the visual image of the RGB component is converted into a grayscale image, and the image is converted into a binary image to remove the influence of light on the image; finally, the image is filtered to eliminate noise to obtain a segmented image, which clearly distinguishes between bubbles and lubricating oil. The remaining content of lubricating oil is calculated by the proportion of bubbles and lubricating oil in the segmented image.

[0026] Preferably, a storage module is also included, which is used to store the oil content control adjustment results, and stores the oil content data each time the adjustment module issues an order to adjust the frequency and opening of the circulating oil pump to the main control module according to the oil content data of the heat exchanger, so as to satisfy the subsequent adjustment module to directly issue the frequency and opening data commands of the circulating oil pump according to the required oil content of the heat exchanger.

[0027] The present invention has the following beneficial effects:

[0028] 1. An oil circulation pump is installed to overcome the resistance of the pump oil pipeline and is not affected by the system refrigerant test conditions.

[0029] 2. Automatically adjust the frequency of the circulating oil pump and the opening of the regulating valve so that the oil circulation flow rate reaches the set requirements, so that the experiment can be automatically carried out according to the set parameter conditions, thereby improving the test efficiency.

[0030] 3. This test device has a simple structure, accurate, reliable and fast control, and can stably control the working conditions of different oil contents for a long time, ensuring the authenticity and repeatability of the test results.

[0031] 4. The present invention can accurately control the oil content of the heat exchanger by setting up a control test system. Since the filter and the oil separator cannot completely separate the lubricating oil from the refrigerant, there will still be lubricating liquid inside the refrigerant circulation pipeline. The present invention sets a visual module above the two sight glasses, and uses an industrial camera to shoot the flow of the lubricating oil inside the two sight glasses. When the lubricating oil flows inside the sight glasses, since the lubricating oil content is fixed, the more the lubricating oil content, the fewer bubbles appear inside the sight glasses. Conversely, the less the lubricating oil, the more bubbles appear inside the sight glasses. Therefore, in this simple way, To determine how much lubricating oil is left after passing through the filter and the oil separator. If no bubbles appear inside the sight glass, it means that the filter and the oil separator have completely separated the lubricating oil and the refrigerant. If bubbles appear, it means that the lubricating oil flowing into the circulating oil pump is not full. The segmented image taken by the first sight glass is analyzed by the analysis module to obtain the remaining content of the lubricating oil, and the remaining content of the lubricating oil in the segmented image of the second sight glass is calculated. The content of the lubricating oil output to the refrigeration circulation pipeline can be obtained, plus the original residual lubricating oil content in the refrigeration circulation pipeline, which is the total oil content. The oil content obtained by this method is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the principle of the heat exchanger oil content control and adjustment device provided by the present invention.

[0034] In the figure: 1. Oil flow meter; 2. Refrigerant flow meter; 3. Circulating oil pump; 4. Electric regulating valve; 51. First sight glass; 52. Second sight glass; 6. Filter; 7. Oil separator; 8. Bypass valve; 9. Pneumatic on-off valve; 10. Electronic expansion valve; 11. Auxiliary compressor; 12. Capillary tube. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0036] See also Figure 1 , the present invention is a heat exchanger oil content control and adjustment device, including a regulating device, and a control test system communicating with the regulating device; the regulating device includes an air conditioning component and a control regulating component;

[0037] The air conditioning assembly includes an auxiliary compressor 11, and a condensing heat exchanger, an electronic expansion valve 10 and an evaporative heat exchanger connected in series with the auxiliary compressor 11 through a refrigerant circulation pipeline in sequence, and the evaporative heat exchanger is connected to the auxiliary compressor 11 through a refrigerant circulation pipeline;

[0038] The control and adjustment component includes an oil separator 7 and a refrigerant flow meter 2, the refrigerant flow meter 2 is installed on the refrigerant circulation pipeline between the electronic expansion valve 10 and the refrigerant heat exchanger, the oil separator 7 is installed between the auxiliary compressor 11 and the condensing heat exchanger, and the oil separator 7 is connected to the first sight glass 51, the circulating oil pump 3, the oil flow meter 1, the second sight glass 52 and the electric regulating valve 4 in sequence through the oil circulation pipeline, and the outlet of the electric regulating valve 4 is respectively connected to two pneumatic on-off valves 9 through the oil circulation pipeline, one of the pneumatic on-off valves 9 is connected to the refrigerant circulation pipeline between the refrigerant flow meter 2 and the condensing heat exchanger through the oil circulation pipeline, and the other pneumatic on-off valve 9 is connected to the refrigerant circulation pipeline between the oil separator 7 and the condensing heat exchanger through the oil circulation pipeline;

[0039] The control test system includes a main control module, and a regulating module, a monitoring module, an analysis module and a decision module that establish communication connections with the main control module;

[0040] Main control module: used to feed back the operating status data of each component of the regulating equipment to the display interface, and control the operating status of each component by controlling the commands of other modules in the test system;

[0041] Adjustment module: used to send query commands to the main control module according to the oil content parameters of the heat exchanger required by the tester, query the real-time oil circulation flow of oil flow meter 1 and the real-time refrigerant circulation flow of refrigerant flow meter 2, and calculate the oil content according to the formula: , calculate the oil content of the heat exchanger, and issue a command to adjust the frequency and opening of the circulating oil pump 3 to the main control module according to the oil content data of the heat exchanger, until the oil content meets the oil content parameter of the heat exchanger required by the tester;

[0042] Visual module: including industrial cameras respectively arranged above the sight glass of the two sight glasses, used to respectively shoot downward the visual images of the lubricating oil flowing inside the two sight glasses at the same time through the industrial cameras, and respectively process the visual images of the lubricating oil flowing inside the two sight glasses, distinguish the bubbles and lubricating oil inside the visual images, obtain the segmented images, and output them to the analysis module;

[0043] Analysis module: used to receive the segmented images processed during the lubricating oil flow process output by the visual module to the two sight glasses, and to infer the lubricating oil content when the lubricating oil passes through the two sight glasses according to the lubricating oil content represented by the respective ratios of bubbles and lubricating oil in the preset segmented images, wherein the more the bubbles occupy the area of ​​the segmented images, the less the lubricating oil content; the lubricating oil content in the regulating device is a fixed amount, and the remaining lubricating oil content of the circulating oil pump 3 is the lubricating oil content passing through the first sight glass 51 minus the lubricating oil content passing through the second sight glass 52; finally, the remaining lubricating oil content in the circulating oil pump 3 is compared with the oil content parameter of the heat exchanger and output to the decision module;

[0044] Decision-making module: used to determine whether the oil content control and adjustment result of the heat exchanger is accurate. If the sum of the remaining content of the lubricating oil in the circulating oil pump 3 and the oil content data of the heat exchanger after the oil content parameter of the heat exchanger is converted is equal to the total amount of the lubricating oil, then the oil content control and adjustment result is determined to be accurate. If the sum of the remaining content of the lubricating oil in the circulating oil pump 3 and the oil content data of the heat exchanger after the oil content parameter of the heat exchanger is converted is not equal to the total amount of the lubricating oil, then the oil content control and adjustment result is determined to be inaccurate, and the control and adjustment are performed again.

[0045] The oil inlet of the auxiliary compressor 11 is connected with a capillary 12 , one end of which is installed on the oil circulation pipeline between the circulating oil pump 3 and the first sight glass 51 ; a bypass valve 8 is connected in parallel to one side of the circulating oil pump 3 .

[0046] Among them, the main control module communicates with the regulating equipment to obtain various structural data and displays them on the display interface. The display content includes the oil circulation flow and refrigerant circulation flow of the oil flow meter 1 and the refrigerant flow meter 2, and the visual images of the lubricating oil flow process inside the sight glass taken by two industrial cameras.

[0047] Among them, the visual module uses an industrial camera to shoot downwards the visual images of the lubricating oil flow process inside two sight glasses at the same time, which includes the following specific steps: two groups of industrial cameras simultaneously shoot multiple visual images of the two sight glasses within a period of time, respectively, and compare the two groups of several visual images, and select two visual images of the lubricating oil flow in the two sight glasses at the same time node for processing, wherein whether the flow is stable is determined according to the number of bubbles in each group of visual images, and the photos whose bubble numbers are obviously different from the rest of the visual images in the same group are eliminated; the two selected visual images are processed and output as segmented images to the analysis module;

[0048] Among them, a light box is installed above the sight glass, and the industrial camera is installed on the top of the light box. The light box is blocked by a blackout cloth to form a darker shooting environment. The industrial camera uses a flash to shoot.

[0049] The processing of the two visual images includes the following specific steps: first, color model conversion is performed to convert the obtained RGB model visual image into an HSV model image. During the model conversion, the brightness factor in RGB needs to be separated, where the expressions of H, S, and V components are:

[0050] ;

[0051] ;

[0052] ;

[0053] In the formula: R, G, B are red, green, and blue values ​​respectively; H, S, and V are hue, saturation, and brightness component values ​​respectively;

[0054] Randomly, while processing the image, the visual image of the RGB component is converted into a grayscale image, and the image is converted into a binary image to remove the influence of light on the image; finally, the image is filtered to eliminate noise to obtain a segmented image, which clearly distinguishes between bubbles and lubricating oil. The remaining content of lubricating oil is calculated by the proportion of bubbles and lubricating oil in the segmented image.

[0055] It also includes a storage module, which is used to store the oil content control adjustment results, and stores the oil content data each time the adjustment module sends an order to adjust the frequency and opening of the circulating oil pump 3 to the main control module according to the oil content data of the heat exchanger, so as to meet the needs of the subsequent adjustment module to directly issue the frequency and opening data commands of the circulating oil pump 3 according to the required oil content of the heat exchanger.

[0056] In the present invention, the electric regulating valve 4 is connected in series to the outlet of the oil flow meter 1, and an oil circulation pump is installed at the inlet of the oil flow meter 1, so that the oil in the pipeline can pass through the oil flow meter 1 and the electric regulating valve 4 in sequence, two sight glasses are used to observe the state of the oil circulation loop, and the filter 6 is used to protect the circulating oil pump 3 to prevent impurities in the system pipeline from affecting the test results; the bypass valve 8 is used to prevent the circulating oil pump 3 from being blocked, and the pneumatic on-off valve 9 is used to switch the pipeline when testing the evaporative heat exchanger or the condensing heat exchanger.

[0057] The principles of the evaporative heat exchanger test and the condensing heat exchanger test are similar, except that the pump oil inlet position is different. During the evaporative heat exchanger test: the circulating oil pump 3, the electric regulating valve 4, the oil flow meter 1, the refrigerant flow meter 2, and the pneumatic on-off valve 9 are electrically connected to the control test system respectively; when the system receives the test sample type, it will automatically control the switch of the pneumatic on-off valve 9, at which time the circulating oil pump 3 is turned on, so that the pump oil pipeline circulates; the controller will automatically adjust the output frequency of the circulating oil pump 3 and the opening of the electric regulating valve 4 according to the set oil content value to achieve the target value.

[0058] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A heat exchanger oil content control and adjustment device, characterized in that: It includes a regulating device and a control test system communicating with the regulating device; the regulating device includes an air conditioning component and a control regulating component; The air conditioning assembly comprises an auxiliary compressor (11), and a condensing heat exchanger, an electronic expansion valve (10), and an evaporating heat exchanger which are sequentially connected in series with the auxiliary compressor (11) via a refrigerant circulation pipeline, wherein the evaporating heat exchanger is connected to the auxiliary compressor (11) via a refrigerant circulation pipeline; The control and adjustment component comprises an oil separator (7) and a refrigerant flow meter (2), wherein the refrigerant flow meter (2) is installed on the refrigerant circulation pipeline between the electronic expansion valve (10) and the refrigerant heat exchanger, and the oil separator (7) is installed between the auxiliary compressor (11) and the condensing heat exchanger, and the oil separator (7) is connected to the first sight glass (51), the circulating oil pump (3), the oil flow meter (1), the second sight glass (52) and the electric regulating valve (4) in sequence through the oil circulation pipeline, and the outlet of the electric regulating valve (4) is respectively connected to two pneumatic on-off valves (9) through the oil circulation pipeline, one of the pneumatic on-off valves (9) is connected to the refrigerant circulation pipeline between the refrigerant flow meter (2) and the condensing heat exchanger through the oil circulation pipeline, and the other pneumatic on-off valve (9) is connected to the refrigerant circulation pipeline between the oil separator (7) and the condensing heat exchanger through the oil circulation pipeline; The control test system includes a main control module, and a regulating module, a monitoring module, an analysis module and a decision module that establish communication connections with the main control module; Main control module: used to feed back the operating status data of each component of the regulating equipment to the display interface, and control the operating status of each component by controlling the commands of other modules in the test system; Adjustment module: used to send a query command to the main control module according to the oil content parameter of the heat exchanger required by the tester, query the real-time oil circulation flow of the oil flow meter (1) and the real-time refrigerant circulation flow of the refrigerant flow meter (2), and calculate the oil content according to the formula: , calculate the oil content of the heat exchanger, and issue a command to adjust the frequency and opening of the circulating oil pump (3) to the main control module according to the oil content data of the heat exchanger, until the oil content meets the oil content parameter of the heat exchanger required by the tester; Visual module: including industrial cameras respectively arranged above the sight glass of the two sight glasses, used to respectively shoot downward the visual images of the lubricating oil flowing inside the two sight glasses at the same time through the industrial cameras, and respectively process the visual images of the lubricating oil flowing inside the two sight glasses, distinguish the bubbles and lubricating oil inside the visual images, obtain the segmented images, and output them to the analysis module; The visual module uses an industrial camera to shoot downwards the visual images of the lubricating oil flowing in two sight glasses at the same time, which includes the following specific steps: two groups of industrial cameras simultaneously shoot multiple visual images of the two sight glasses within a period of time, respectively, compare the two groups of several visual images, and select two visual images of the lubricating oil flowing stably in the two sight glasses at the same time node for processing, wherein whether the flow is stable is determined based on the number of bubbles in each group of visual images, and the photos with the number of bubbles that are obviously different from the rest of the visual images in the same group are eliminated; the two selected visual images are processed and output as segmented images to the analysis module; A light box is installed above the sight glass, and the industrial camera is installed on the top of the light box. The light box is shielded by a blackout cloth to form a darker shooting environment. The industrial camera shoots with a flash. Analysis module: used to receive the segmented images processed during the lubricating oil flow process outputted by the visual module to the two sight glasses, and to infer the lubricating oil content when the lubricating oil passes through the two sight glasses according to the respective ratios of bubbles to lubricating oil in the preset segmented images, wherein the greater the ratio of bubbles to the segmented image area, the less the lubricating oil content; the lubricating oil content in the regulating device is a fixed amount, and the remaining lubricating oil content of the circulating oil pump is the lubricating oil content passing through the first sight glass (51) minus the lubricating oil content passing through the second sight glass (52); finally, the remaining lubricating oil content in the circulating oil pump is compared with the oil content parameter of the heat exchanger and output to the decision module; Decision-making module: used to determine whether the oil content control adjustment result of the heat exchanger is accurate. If the sum of the remaining content of the lubricating oil in the circulating oil pump and the oil content data of the heat exchanger after the oil content parameter of the heat exchanger is converted is equal to the total amount of lubricating oil, then the oil content control adjustment result is determined to be accurate. If the sum of the remaining content of the lubricating oil in the circulating oil pump and the oil content data of the heat exchanger after the oil content parameter of the heat exchanger is converted is not equal to the total amount of lubricating oil, then the oil content control adjustment result is determined to be inaccurate, and the control adjustment is performed again. The processing of the two visual images includes the following specific steps: first, color model conversion is performed to convert the obtained RGB model visual image into an HSV model image. During the model conversion, the brightness factor in RGB needs to be separated, where the expressions of H, S, and V components are: ； ； ； In the formula: R, G, B are red, green, and blue values ​​respectively; H, S, and V are hue, saturation, and brightness component values ​​respectively; Then, while processing the image, the visual image of the RGB component is converted into a grayscale image, and the image is converted into a binary image to remove the influence of light on the image; finally, the image is filtered to eliminate noise to obtain a segmented image, which clearly distinguishes between bubbles and lubricating oil. The remaining content of lubricating oil is calculated by the proportion of bubbles and lubricating oil in the segmented image.

2. The oil content control and adjustment device for a heat exchanger according to claim 1, characterized in that: The oil inlet of the auxiliary compressor (11) is connected to a capillary tube (12), one end of which is mounted on an oil circulation pipeline between a circulating oil pump (3) and a first sight glass (51); a bypass valve (8) is connected in parallel to one side of the circulating oil pump (3).

3. The oil content control and adjustment device for a heat exchanger according to claim 2, characterized in that: The main control module communicates with the regulating device to obtain various structural data and displays them on a display interface. The displayed content includes the oil circulation flow rate and the refrigerant circulation flow rate of the oil flow meter (1) and the refrigerant flow meter (2), and visual images of the lubricating oil flow process inside the sight glass taken by two industrial cameras.

4. The oil content control and adjustment device for a heat exchanger according to claim 3, characterized in that: It also includes a storage module, which is used to store the oil content control adjustment results and store the oil content data each time the adjustment module issues a command to adjust the frequency and opening of the circulating oil pump (3) to the main control module based on the oil content data of the heat exchanger, so as to satisfy the subsequent adjustment module to directly issue a command to adjust the frequency and opening data of the circulating oil pump (3) based on the required oil content of the heat exchanger.

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