Air conditioning system pipeline processing device and control method thereof

Abstract

The invention provides an air conditioning system pipeline processing device and a control method thereof.The air conditioning system pipeline processing device comprises a refrigerant driving assembly, and the refrigerant driving assembly comprises a compressor, a first pipeline controllably communicating with an air suction port of the compressor and a second pipeline controllably communicating with an exhaust port of the compressor; the first pipeline is provided with a first connector communicated with a first target refrigerant pipe of the air conditioning system, the second pipeline is provided with a second connector communicated with a second target refrigerant pipe of the air conditioning system, a throttling element is connected in the first pipeline in series, and the refrigerant recovery tank is controllably communicated with the exhaust port through a refrigerant recovery pipeline. The second pipeline is further provided with a system flushing connector, the system flushing connector is used for being communicated with a cleaning component, the cleaning component is used for providing pressure cleaning fluid, and the first pipeline is further provided with an emptying opening used for discharging the pressure cleaning fluid. The whole operation process can be specifically carried out in an operation mode selection mode, excessive manual participation is not needed, and the operation is simple.

Description

Technical Field

[0001] The invention belongs to the technical field of design of pipeline processing equipment for air-conditioning systems, and in particular relates to a pipeline processing device for an air-conditioning system and a control method thereof. Background Art

[0002] With the rapid development of communication technology, the country has vigorously promoted the construction of communication base stations and computer rooms, and the market demand for computer room refrigeration equipment has steadily increased. At the same time, since temperature control energy consumption accounts for a huge proportion of computer room energy consumption, the market has higher and higher requirements for the energy efficiency of computer room refrigeration equipment, and products are facing frequent updates and replacements. In the renovation of old computer rooms and the replacement of new machines, there are many long connecting pipes buried in the wall that cannot be replaced with new ones. The failure to clean the old pipes will affect the operation of the new machine. During the air conditioning maintenance process, not cleaning the system before replacing parts will affect the operating life of the unit after maintenance; in addition, the manual operation of refilling and replenishing the refrigerant oil of the unit after replacement and maintenance is relatively complicated and prone to errors. Summary of the invention

[0003] Therefore, the present invention provides an air conditioning system pipeline processing device and a control method thereof, which can solve the technical problems in the prior art of recovering the refrigerant in the air conditioning unit and cleaning the corresponding pipelines by manual operation, which has a relatively complicated operation process and high labor costs.

[0004] In order to solve the above problems, the present invention provides an air-conditioning system pipeline processing device, including a refrigerant drive component, the refrigerant drive component includes a compressor, a first pipeline controllably connected to the suction port of the compressor, and a second pipeline controllably connected to the exhaust port of the compressor, the first pipeline has a first interface connected to a first target refrigerant pipe of the air-conditioning system, the second pipeline has a second interface connected to a second target refrigerant pipe of the air-conditioning system, a throttling element is connected in series in the first pipeline, and also includes a refrigerant recovery tank, the refrigerant recovery tank is controllably connected to the exhaust port through the refrigerant recovery pipeline, the second pipeline also has a system flushing interface, the system flushing interface is used to connect with a cleaning component, the cleaning component is used to provide a pressure cleaning fluid, and the first pipeline also has an emptying port for discharging the pressure cleaning fluid.

[0005] In some embodiments, a first solenoid valve is connected in series on the first pipeline, a second solenoid valve is connected in series on the second pipeline, a third solenoid valve is connected in series on the pipeline between the refrigerant recovery tank and the exhaust port, a fourth solenoid valve is connected in series on the pipeline between the exhaust port and the first pipeline, the refrigerant recovery pipeline is connected to the second pipeline, and the connection position is between the exhaust port and the second solenoid valve; and / or the pressure cleaning fluid is nitrogen.

[0006] In some embodiments, a filter is further connected in series on the first pipeline between the first solenoid valve and the throttling element; and / or, the compressor, the throttling element, the third solenoid valve, the refrigerant recovery tank and the pipelines therebetween are on a first weighing device.

[0007] In some embodiments, the air-conditioning system pipeline processing device also includes a vacuum pump, which is connected to the second pipeline through a third pipeline, and the connecting position between the third pipeline and the second pipeline is between the second solenoid valve and the second interface, and a fifth solenoid valve is connected in series to the third pipeline.

[0008] In some embodiments, the air-conditioning system pipeline processing device also includes a refrigeration oil filling assembly, which includes an oil tank and an oil pump. The inlet of the oil pump is connected to the oil tank, and the outlet of the oil pump is controllably connected to the second pipeline through a fourth pipeline. The connecting position of the fourth pipeline and the second pipeline is between the exhaust port of the compressor and the second solenoid valve, and a sixth solenoid valve is connected in series to the fourth pipeline.

[0009] In some embodiments, the air-conditioning system pipeline processing device also includes a refrigerant filling component, the refrigerant filling component includes a refrigerant filling tank, the outlet of the refrigerant filling tank is connected to the fourth pipeline through a refrigerant filling pipeline, and the connecting position of the refrigerant filling pipe and the fourth pipeline is between the sixth solenoid valve and the second solenoid valve, and a seventh solenoid valve is connected in series to the refrigerant filling pipeline.

[0010] In some embodiments, the refrigerant filling pipeline is also connected to the first pipeline through a fifth pipeline, the connecting position of the fifth pipeline and the first pipeline is between the first solenoid valve and the throttling element, and the throttling element is an electronic expansion valve; and / or the oil tank and the refrigerant filling tank are simultaneously on a second weighing device.

[0011] In some embodiments, a one-way valve is further connected in series to the fourth pipe, the one-way valve is located between the seventh solenoid valve and the second solenoid valve, and the conducting direction of the one-way valve is from the seventh solenoid valve to the second solenoid valve.

[0012] The present invention also provides a control method for the above-mentioned air conditioning system pipeline processing device, comprising the following steps:

[0013] Acquire the operation mode of the air conditioning system pipeline processing device;

[0014] When the operation mode is the refrigerant recovery mode, obtaining the real-time tank pressure Ps in the refrigerant recovery tank;

[0015] When the real-time pressure Ps in the tank is lower than the high pressure limit P1 of the refrigerant recovery tank, the first solenoid valve and the third solenoid valve are controlled to be turned on, the second solenoid valve is turned off, and the compressor is controlled to operate; and when the suction pressure Pi of the compressor is lower than the low pressure limit P2, the first solenoid valve and the third solenoid valve are controlled to be turned off, and the compressor is controlled to stop operating;

[0016] When the real-time pressure Ps in the tank is not lower than the high pressure limit P1 of the refrigerant recovery tank, a high pressure alarm is issued.

[0017] In some embodiments, when the air conditioning system pipeline processing device includes a first weighing device, after the suction pressure Pi of the compressor is lower than the low pressure limit P2 and the first solenoid valve and the third solenoid valve are controlled to be cut off, the mass change value of the components on the first weighing device is obtained.

[0018] In some embodiments, when the operating mode is the system cleaning mode, the first solenoid valve, the second solenoid valve, and the fourth solenoid valve are controlled to be in a cut-off state, and a pressure cleaning fluid is introduced into the air-conditioning system. When the system pressure P0 of the air-conditioning system is greater than the emptying limit P3, the fourth solenoid valve is controlled to be turned on to achieve the emptying of the pressure cleaning fluid.

[0019] In some embodiments, the fourth solenoid valve is emptied multiple times, and between two emptying cycles, the fourth solenoid valve is turned on for a first preset time period.

[0020] In some embodiments, when the air conditioning system pipeline processing device includes a vacuum pump and the operating mode is a system vacuum mode, the fifth solenoid valve is controlled to be turned on, the first solenoid valve, the second solenoid valve, and the fourth solenoid valve are all turned off, and the vacuum pump is controlled to operate.

[0021] In some embodiments, the system pressure P0 of the air-conditioning system is obtained during the operation of the vacuum pump, and when the system pressure P0 is lower than a preset vacuum degree for a second consecutive preset time period, the fifth solenoid valve is controlled to be cut off.

[0022] In some embodiments, the relationship between the system pressure P0 and the preset vacuum degree is continuously obtained within the third consecutive preset time period after the fifth solenoid valve is cut off. When the system pressure P0 is less than the preset vacuum degree for the third consecutive preset time period, the vacuum pump is controlled to stop operating; when the system pressure P0 is not less than the preset vacuum degree for the third consecutive preset time period, the fifth solenoid valve is controlled to be turned on again, and the third preset time period is greater than the second preset time period.

[0023] In some embodiments, when the air-conditioning system pipeline processing device includes a refrigeration oil filling component and the operating mode is a system refrigeration oil filling mode, the first solenoid valve, the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve are all controlled to be cut off, the second solenoid valve and the sixth solenoid valve are controlled to be turned on, and the oil pump is controlled to run to fill the air-conditioning system with a first preset mass of refrigeration oil, and then the oil pump is controlled to stop running and the sixth solenoid valve is controlled to be cut off.

[0024] In some embodiments, when the air-conditioning system pipeline processing device includes a refrigerant filling assembly, the refrigerant filling pipeline is connected to the first pipeline and the operating mode is the system refrigerant filling mode, the seventh solenoid valve and the second solenoid valve are controlled to be turned on, and the first solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, and the sixth solenoid valve are controlled to be turned off, and at least part of the refrigerant in the refrigerant tank is injected into the air-conditioning system by utilizing the pressure difference between the refrigerant tank and the air-conditioning system.

[0025] In some embodiments, during the process of connecting the refrigerant filling tank with the air-conditioning system, a change value |△P0| of the system pressure P0 of the air-conditioning system within a preset time is obtained. When the change value |△P0| is not higher than a set pressure difference value, the compressor is controlled to operate until the amount of refrigerant injected into the air-conditioning system reaches a second preset mass, at which time the compressor is controlled to stop operating, and the second solenoid valve and the seventh solenoid valve are controlled to be cut off, and the sum of the first preset mass and the second preset mass is equal to the mass change value.

[0026] In some embodiments, the refrigerant recovery mode, the system cleaning mode, the system vacuum mode, the system refrigeration oil filling mode and the system refrigerant filling mode are executed in sequence.

[0027] The present invention provides an air conditioning system pipeline processing device and a control method thereof, which have the following beneficial effects:

[0028] The air-conditioning system pipeline processing device has the functions of refrigerant recovery and storage for the air-conditioning system and cleaning of the pipelines of various components in the air-conditioning system. The entire operation process can be carried out by selecting the operating mode, without excessive manual participation, and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0030] Figure 1is a schematic diagram of the system principle of the air conditioning system pipeline processing device according to an embodiment of the present invention;

[0031] Figure 2 Figure 1 A schematic diagram of the connection status of the air conditioning system pipeline processing device in the air conditioning system;

[0032] Figure 3 is a schematic diagram of a control flow of the air conditioning system pipeline processing device according to an embodiment of the present invention when operating in a refrigerant recovery mode;

[0033] Figure 4 is a schematic diagram of a control flow of the air conditioning system pipeline processing device according to an embodiment of the present invention when operating in a system cleaning mode;

[0034] Figure 5 It is a schematic diagram of the control flow of the air conditioning system pipeline processing device according to an embodiment of the present invention when operating in a system vacuuming mode;

[0035] Figure 6 It is a control flow diagram of the air conditioning system pipeline processing device of an embodiment of the present invention when operating in a system refrigeration oil filling mode and a system refrigerant filling mode.

[0036] The accompanying drawings are marked as follows:

[0037] 11. compressor; 121. first interface; 122. throttling element; 123. drain port; 124. filter; 131. second interface; 132. system flushing interface; 21. refrigerant recovery tank; 211. fluorine injection port of refrigerant tank; 3. cleaning components; 41. first solenoid valve; 42. second solenoid valve; 43. third solenoid valve; 44. fourth solenoid valve; 45. fifth solenoid valve; 46. sixth solenoid valve; 47. seventh solenoid valve; 48. one-way valve; 51. vacuum pump; 61. first weighing device; 62. second weighing device; 71. oil tank; 72. oil pump; 81. refrigerant tank filling; 91. first pressure sensor; 92. second pressure sensor; 93. third pressure sensor; 100. system outdoor unit; 101. system indoor unit; 102. first connecting valve; 103. second connecting valve; 104. third connecting valve; 105. fourth connecting valve. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0040] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0041] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0042] See also Figure 1 and Figure 6As shown, according to an embodiment of the present invention, there is provided an air conditioning system pipeline processing device, comprising a refrigerant drive assembly (not labeled in the figure), the refrigerant drive assembly comprising a compressor 11, a first pipeline (not labeled in the figure) controllably connected to the air intake port of the compressor 11, and a second pipeline (not labeled in the figure) controllably connected to the exhaust port of the compressor 11, wherein the first pipeline has a first interface 121 (for example, a first interface 121) connected to a first target refrigerant pipe of the air conditioning system. Figure 2 The first connecting valve 102 in the air conditioning system is connected to one of the second connecting valves 103, or the third connecting valve 104 is connected to one of the fourth connecting valves 105), and the second pipeline has a second interface 131 (for example, connected to the second target refrigerant pipe of the air conditioning system) that is connected to the second target refrigerant pipe of the air conditioning system. Figure 2 The first connecting valve 102 in the air conditioning system is connected to one of the second connecting valves 103, or the third connecting valve 104 is connected to one of the fourth connecting valves 105. It can be understood that the aforementioned first interface 121 and the second interface 131 should not be connected to the refrigerant pipe on the same side of the air-conditioning system at the same time, which can be determined according to whether the treatment object is the system outdoor unit 100 or the system indoor unit 101). A throttling element 122 is connected in series in the first pipeline. The setting of the throttling element 122 can reduce the probability of liquid hammer caused by the suction of the compressor 11. It also includes a refrigerant recovery tank 21 (which is a pressure vessel). The refrigerant recovery tank 21 is controllably connected to the exhaust port through a refrigerant recovery pipeline (not marked in the figure). A system flushing interface 132 is also provided on the second pipeline. The system flushing interface 132 is used to communicate with the cleaning component 3. The cleaning component 3 is used to provide a pressure cleaning fluid. The first pipeline also has an emptying port 123 for discharging the pressure cleaning fluid. The aforementioned emptying port 123 can be directly connected to the external atmosphere or to the corresponding pressure container according to different types of pressure cleaning fluids. The aforementioned refrigerant recovery tank 21 is formed with a refrigerant tank fluorine injection port 211 , through which the recovered refrigerant can be subsequently processed.

[0043] See Figure 2 As shown, in a specific application, when the refrigerant of the air-conditioning system is recovered, the first interface 121 is connected to the second connecting valve 103 of the air-conditioning system, and the second interface 131 is connected to the fourth connecting valve 105 of the air-conditioning system, and then the compressor 11 is operated and the corresponding pipelines are controlled to be connected, so as to realize the recovery and storage of the refrigerant in the air-conditioning system; after the refrigerant of the air-conditioning system is recovered, the cleaning component 3 can be connected to the system flushing interface 132, so that the various components in the air-conditioning system can be flushed with a pressure cleaning fluid to ensure the cleanliness of the various components in the air-conditioning system.

[0044] In this technical solution, the air-conditioning system pipeline processing device has both the refrigerant recovery and storage functions for the air-conditioning system and the cleaning function of the pipelines of various components in the air-conditioning system. The entire operation process can be carried out by selecting the operating mode, without excessive manual participation. The operation is simple and can reduce labor costs.

[0045] In this technical solution, the system flushing interface 132 configured on the second pipeline is used to communicate with the cleaning component 3, so that the various components in the air-conditioning system after the refrigerant is recovered can be cleaned, and impurities such as oil and dirt deposits and oxide scales in the air-conditioning system can be effectively removed, thereby ensuring the subsequent normal and stable operation of the air-conditioning system. The aforementioned pressure cleaning fluid is preferably an environmentally friendly pressure gas, such as nitrogen. In this way, under the premise that the refrigerant is an environmentally friendly refrigerant, the emptying port 123 can be directly connected to the external atmosphere when the system is cleaned. At this time, the aforementioned cleaning component 3 can use a nitrogen tank. Generally speaking, the nitrogen tank is preferably used as a component that does not belong to the processing device of the present invention and is flexibly configured separately. Of course, in some cases, the processing device of the present invention can also be configured with the nitrogen tank. Specifically, the amount of nitrogen required for nitrogen cleaning of the air-conditioning system is very large, which makes the volume of the nitrogen tank in the processing device too large, causing inconvenience in use. For maintenance and installation personnel, nitrogen is very convenient to buy. In addition, the nitrogen tank is a high-pressure tank, which has safety hazards when placed in places where people often walk. Therefore, generally speaking, there is no need to use the nitrogen tank as a standard configuration of the processing device of the present invention.

[0046] In a specific embodiment, a first solenoid valve 41 is connected in series on the first pipeline, a second solenoid valve 42 is connected in series on the second pipeline, a third solenoid valve 43 is connected in series on the pipeline between the refrigerant recovery tank 21 and the exhaust port, a fourth solenoid valve 44 is connected in series on the pipeline between the drain port 123 and the first pipeline, the refrigerant recovery pipeline is connected to the second pipeline, and the connection position is between the exhaust port and the second solenoid valve 42. The aforementioned solenoid valves are arranged on the corresponding pipelines, so that the on-off state switching of the aforementioned solenoid valves can be more flexibly and conveniently controlled to realize the flow direction of the processing device under different operating modes, thereby completing the corresponding processing purpose.

[0047] In some embodiments, a filter 124 is also connected in series on the first pipeline between the first solenoid valve 41 and the throttling element 122 to perform necessary filtering and cleaning on the refrigerant flowing out of the air-conditioning system, i.e., the refrigerant to be recycled, to prevent impurities from entering the compressor 11 and damaging the compressor 11.

[0048] In a preferred embodiment, the compressor 11, the throttling element 122, the third solenoid valve 43, the refrigerant recovery tank 21 and the pipelines between them (i.e., the pipelines connecting the components) are on the first weighing device 61, and the first weighing device 61 can be a commercially available weighing scale. In this technical solution, the amount of refrigerant recovered from the air-conditioning system can be weighed more accurately by the first weighing device 61, so that the amount of refrigerant that needs to be injected into the air-conditioning system can be estimated later to ensure the accuracy of the refrigerant injection amount.

[0049] In a preferred embodiment, the air-conditioning system pipeline processing device also includes a vacuum pump 51, which is connected to the second pipeline through a third pipeline (not marked in the figure), and the connecting position between the third pipeline and the second pipeline is between the second solenoid valve 42 and the second interface 131, and a fifth solenoid valve 45 is connected in series to the third pipeline.

[0050] In this technical solution, by connecting the vacuum pump 51 to the second pipeline near the second interface 131, the air conditioning system is evacuated by running the vacuum pump 51, thereby preventing the residual air or pressure cleaning fluid in the system after the refrigerant is subsequently added to the air conditioning system, resulting in low performance of the air conditioning system. The connection position between the third pipeline and the second pipeline is set between the second solenoid valve 42 and the second interface 131, and the second solenoid valve 42 can be used to cut off the second pipeline during vacuuming, thereby ensuring the vacuuming effect of the air conditioning system connected to the processing device.

[0051] In some embodiments, the air-conditioning system pipeline processing device also includes a refrigeration oil filling assembly (not labeled in the figure), and the refrigeration oil filling assembly includes an oil tank 71 and an oil pump 72. The inlet of the oil pump 72 is connected to the oil tank 71, and the outlet of the oil pump 72 is controllably connected to the second pipeline through a fourth pipeline (not labeled in the figure), and the connecting position of the fourth pipeline and the second pipeline is between the exhaust port of the compressor 11 and the second solenoid valve 42, and a sixth solenoid valve 46 is connected in series to the fourth pipeline.

[0052] In this technical solution, a preset amount of refrigeration oil can be refilled into the air-conditioning system through the refrigeration oil filling component after the refrigerant in the original air-conditioning system has been recovered, cleaned and vacuumed, thereby ensuring the normal operation of the air-conditioning system.

[0053] In some embodiments, the air conditioning system pipeline processing device further includes a refrigerant filling assembly (not labeled in the figure), the refrigerant filling assembly includes a refrigerant filling tank 81, the outlet of the refrigerant filling tank 81 is connected to the fourth pipeline through a refrigerant filling pipeline (not labeled in the figure), and the connection position between the refrigerant filling pipe and the fourth pipeline is between the sixth solenoid valve 46 and the second solenoid valve 42, and the seventh solenoid valve 47 is connected in series to the refrigerant filling pipeline. In this technical solution, the refrigerant filling assembly can refill a preset amount of refrigerant into the air conditioning system after the refrigerant in the original air conditioning system is recovered, cleaned and vacuumed, and the air conditioning system is filled with refrigeration oil, so as to ensure the normal operation of the air conditioning system.

[0054] In some embodiments, the refrigerant filling pipeline is also connected to the first pipeline through a fifth pipeline, and the connection position between the fifth pipeline and the first pipeline is between the first solenoid valve 41 and the throttling element 122, and the throttling element 122 is an electronic expansion valve. At this time, the opening of the throttling element 122 can be controlled to ensure that the compressor 11 pressurizes and injects the refrigerant in the refrigerant tank 81 into the air conditioning system during operation. In a more preferred embodiment, a one-way valve 48 is also connected in series to the fourth pipe, and the one-way valve 48 is between the seventh solenoid valve 47 and the second solenoid valve 42, and the conduction direction of the one-way valve 48 is from the seventh solenoid valve 47 to the second solenoid valve 42. The one-way valve 48 can prevent the short circuit between the air intake port and the exhaust port of the compressor 11 during operation.

[0055] The oil tank 71 and the refrigerant tank 81 are both on the second weighing device 62, and the filling amount of the refrigeration oil and the refrigerant is detected in real time by the second weighing device 62. The second weighing device 62 can be a commercially available part with specifications and weighing accuracy that meet the requirements, and the present invention does not provide special protection for it.

[0056] According to an embodiment of the present invention, there is also provided a control method for the above-mentioned air conditioning system pipeline processing device, comprising the following steps:

[0057] Acquire the operation mode of the air conditioning system pipeline processing device;

[0058] When the operation mode is the refrigerant recovery mode, the real-time tank pressure Ps in the refrigerant recovery tank 21 is obtained by the third pressure sensor 93 disposed on the refrigerant recovery tank 21;

[0059] When the real-time pressure Ps in the tank is lower than the high pressure limit P1 of the refrigerant recovery tank 21 (preset by the control system of the processing device, which is specifically related to the remaining volume in the refrigerant recovery tank 21, and is generally the pressure value that the air-conditioning system is designed to withstand), the first solenoid valve 41 and the third solenoid valve 43 are controlled to be turned on, the second solenoid valve 42 is cut off, and the compressor 11 is controlled to operate, and the suction pressure Pi of the compressor 11 (obtained by the second pressure sensor 92, which is specifically set at the downstream position of the refrigerant outlet of the throttling element 122) is lower than the low pressure limit When the value P2 (preset by the control system of the processing device, which can be determined according to the recovery rate requirements of the refrigerant) is reached, it means that the refrigerant recovery is completed, the first solenoid valve 41 and the third solenoid valve 43 are controlled to be cut off, and the compressor 11 is controlled to stop running, thus ending the operation of the refrigerant recovery mode; when the real-time pressure Ps in the tank is not lower than the high-pressure limit value P1 of the refrigerant recovery tank 21, it means that the tank volume is insufficient. At this time, a high-pressure alarm should be issued to remind the operator to replace the refrigerant recovery tank in time, 1, for example, by voice alarm, photoelectric alarm, etc.

[0060] When the air-conditioning system pipeline processing device includes a first weighing device 61, after the suction pressure Pi of the compressor 11 is lower than the low pressure limit P2, and the first solenoid valve 41 and the third solenoid valve 43 are controlled to be cut off, the mass change value of the components on the first weighing device 61 is obtained to record the amount of refrigerant recovered from the air-conditioning system.

[0061] In this mode, the second solenoid valve 42, the fourth solenoid valve 44, the sixth solenoid valve 46 and the seventh solenoid valve 47 should be in the cut-off state, and the on-off state of the fifth solenoid valve 45 will not affect the aforementioned refrigerant recovery process. Therefore, its state can be in the set initial state.

[0062] Specifically Figure 3 Taking the figure as an example, the operation logic of the refrigerant recovery mode is further explained as follows:

[0063] S401, start, the controller confirms the start, and the control method begins to execute;

[0064] S402, detecting the pressure Ps of the third pressure sensor 93, and detecting the pressure of the refrigerant tank before recycling to ensure that the refrigerant tank has sufficient volume;

[0065] S403, compare Ps with the high pressure limit value P1, the high pressure limit value P1 is a preset value of the system program, generally the pressure value that the air conditioning system is designed to withstand; by comparing Ps with the high pressure limit value P1, it can be determined whether the refrigerant tank volume is sufficient, so as to determine whether refrigerant recovery can be started; when the refrigerant tank pressure Ps is greater than or equal to the high pressure limit value P1, enter the refrigerant tank recovery high pressure alarm S404, when the refrigerant tank pressure Ps is less than the high pressure limit value P1, enter the first solenoid valve 41 and the third solenoid valve 45 to open S405;

[0066] S404, high pressure alarm for refrigerant tank recovery. When the refrigerant tank pressure Ps is greater than or equal to the high pressure limit P1, the refrigerant cannot be recovered and an alarm is required;

[0067] S405, opening the first solenoid valve 41 and the third solenoid valve 43. When the refrigerant tank pressure Ps is less than the high pressure limit value P1, refrigerant recovery can be started, so the first solenoid valve 41 and the third solenoid valve 43 are opened;

[0068] S406, start the compressor 11 to recover the refrigerant. After the first solenoid valve 41 and the third solenoid valve 43 are opened, the refrigerant recovery flow path of the component is connected, and the compressor 11 can be turned on to start recovering the refrigerant of the internal and external units into the recovery refrigerant tank;

[0069] S407, detecting the pressure Pi of the second pressure sensor 92. During the recovery process, the detection value Pi of the second pressure sensor 92 is the system low pressure value, and the degree of refrigerant recovery can be determined by Pi;

[0070] S408, compare Pi with the low pressure limit P2, the low pressure limit P2 is the preset value of the system program, and its size is set according to the minimum suction pressure allowed by the compressor; by comparing Pi with the low pressure limit P2, it can be determined whether the refrigerant recovery is completed; when Pi is greater than or equal to P2, return to the detection pressure PsS402, and when Pi is less than P2, enter the process of closing the first solenoid valve 41 and the third solenoid valve 43S409.

[0071] S409, closing the first solenoid valve 41 and the third solenoid valve 43, and immediately closing the first solenoid valve 41 and the third solenoid valve 43 after the refrigerant recovery is completed by judging by the pressure, so as to prevent the refrigerant from flowing back;

[0072] S410, shut down the compressor 11, close the first solenoid valve 41 and the third solenoid valve 43, and shut down the compressor 11;

[0073] S411, recording the weighing value M1 of the first weighing device 61. After the recovery is completed, the first weighing device 61 is used to weigh and calculate the weight M1 of the electronic expansion valve (i.e., the aforementioned throttling element 122), the compressor 11, the third solenoid valve 43 and the refrigerant recovery tank 21, so as to compare and obtain the amount of oil and refrigerant that should be refilled later;

[0074] S412, end, after weighing, the refrigerant recovery weighing is completed.

[0075] When the operation mode is the system cleaning mode, the first solenoid valve 41, the second solenoid valve 42, and the fourth solenoid valve 44 are controlled to be in the cut-off state, and the pressure cleaning fluid is introduced into the air-conditioning system. When the system pressure P0 of the air-conditioning system is greater than the emptying limit value P3, the fourth solenoid valve 44 is controlled to be turned on to realize the emptying of the pressure cleaning fluid. At this time, the pressure cleaning fluid in the cleaning component 3 is discharged through the system flushing interface 132 and the second interface 131 along the Figure 2 The second connecting valve 103 in the state shown enters the system indoor unit 101 of the air-conditioning system. Since the fourth solenoid valve 44 is in the cut-off state during this process, the cleaning fluid forms a certain pressure in the air-conditioning system. After a period of time, the fourth solenoid valve 44 is controlled to be turned on, and the pressure fluid flows through the system indoor unit 101 and is discharged through the fourth connecting valve 105-first interface 121-drain port 123, thereby cleaning the indoor side pipeline components of the air-conditioning system. Similarly, when it is necessary to clean the outdoor side pipeline components of the air-conditioning system, the first interface 121 is connected to the third connecting valve 104 on the outdoor side, and the second interface 131 is connected to the first connecting valve 102 on the outdoor side. The operation method is the same as mentioned above and will not be repeated here.

[0076] In some embodiments, the fourth solenoid valve 44 is emptied multiple times (e.g., 20 times), and the fourth solenoid valve 44 is turned on for a first preset time (e.g., 10s) between two times. Multiple intermittent alternating flushing can improve the cleaning effect of the air-conditioning system.

[0077] In this mode, the first solenoid valve 41, the second solenoid valve 42, and the fifth solenoid valve 45 should be in the cut-off state, and the on-off state of the third solenoid valve 43, the sixth solenoid valve 46 and the seventh solenoid valve 47 will not affect the aforementioned flushing process. Therefore, their states can be in the set initial state.

[0078] Specifically Figure 4 Taking the example shown above, the operating logic of the system cleaning mode is further explained as follows:

[0079] S501, start, the controller confirms the start, and the control method begins to execute;

[0080] S502, the system flushing interface 132 is connected to a nitrogen tank. The unit (i.e., the processing device of the present invention) is normally configured without a nitrogen tank. When using the nitrogen cleaning system function, the nitrogen tank needs to be manually connected to the system flushing interface 132;

[0081] S503, emptying times X=0, using nitrogen to clean the refrigerant system (i.e., the air conditioning system), multiple nitrogen filling and emptying are required, and the emptying times in this embodiment are set to 20 times;

[0082] S504, obtaining the pressure P0 detected by the first pressure sensor 91. During the emptying process, the pressure value P0 detected by the first pressure sensor 91 is the pressure value of the indoor unit and the outdoor unit, which can be used to determine whether the emptying limit value P3 is reached, thereby controlling the opening of the fourth solenoid valve 44 for emptying;

[0083] S505, compare P0 with the emptying limit value P3, the emptying limit value P3 is a preset value of the system program, generally between 1500kPa and 2500kPa, and is specifically set according to the pressure value of the connected nitrogen tank and the length of the pipeline system; by comparing P0 with the emptying limit value P3, it can be determined whether to empty; when P0 is less than or equal to P3, continue to measure the pressure P0 of the first pressure sensor 91; when P0 is greater than P3, emptying can be performed, and logically the emptying times are first increased by 1;

[0084] S506, X=X+1, the number of emptying times increases by 1;

[0085] S507, open the fourth solenoid valve 44 for 10 seconds and then close it. When the system pressure reaches the emptying limit, it is necessary to open the fourth solenoid valve 44 for emptying. In order to allow sufficient time for the nitrogen emptying and cleaning process, the opening time of the fourth solenoid valve 44 in the cleaning and emptying stage is set to 10 seconds;

[0086] S508, comparing X with 20, the emptying times in this embodiment is set to 20 times, when the emptying times do not reach 20 times, repeat the nitrogen emptying and cleaning process; when the emptying times reach 20 times, the entire nitrogen cleaning system is about to end;

[0087] S509, remove the nitrogen tank. The unit is normally equipped with no nitrogen tank. The nitrogen tank needs to be removed after using the nitrogen cleaning system function.

[0088] S510, end, the function ends after 20 nitrogen evacuations are completed.

[0089] When the air-conditioning system pipeline processing device includes a vacuum pump 51 and the operation mode is the system vacuum mode, the fifth solenoid valve 45 is controlled to be turned on, the first solenoid valve 41, the second solenoid valve 42, and the fourth solenoid valve 44 are all cut off, and the vacuum pump 51 is controlled to operate to achieve the purpose of vacuuming the air-conditioning system after cleaning, thereby preventing the presence of non-refrigerant and refrigerant fluids such as residual air in the system after refrigerant is added, thereby reducing the air-conditioning performance.

[0090] During the operation of the vacuum pump 51, the system pressure P0 of the air-conditioning system is obtained, and when the system pressure P0 is lower than the preset vacuum degree (e.g., 50 kPa) within the second consecutive preset time (e.g., 10 seconds), it means that the vacuum degree of the air-conditioning system has reached the design requirements, so the fifth solenoid valve 45 is controlled to be cut off. Further, within the third consecutive preset time (e.g., 10 minutes) after the fifth solenoid valve 45 is cut off, the magnitude relationship between the system pressure P0 and the preset vacuum degree is continuously obtained. When the system pressure P0 is lower than the preset vacuum degree for the third consecutive preset time, it means that there is no leakage in the components of the air-conditioning system, so the vacuum pump 51 is controlled to stop running; when the system pressure P0 is not lower than the preset vacuum degree for the third consecutive preset time, it means that the system vacuum degree has rebounded, and it is necessary to control the fifth solenoid valve 45 to be turned on again to perform the vacuum operation to ensure the stability of the vacuum state. The third preset time is longer than the second preset time. During this process, the first solenoid valve 41, the second solenoid valve 42, and the fourth solenoid valve 44 should all be in the cut-off state, and the on-off state of the third solenoid valve 43, the sixth solenoid valve 46, and the seventh solenoid valve 47 will not affect the aforementioned vacuum pumping process, so their states can be in the set initial state.

[0091] Specifically Figure 5 Taking the example shown above, the operating logic of the system vacuum mode is further explained as follows:

[0092] S601, start, the controller confirms the start, and the control method begins to execute;

[0093] S602, opening the fifth solenoid valve 45. Before vacuuming, the fifth solenoid valve 45 is opened to connect the system to the vacuum pump 51;

[0094] S603, turning on the vacuum pump 51 to start evacuating the system;

[0095] S604, detecting the pressure P0 of the first pressure sensor 91. During the evacuation process, the pressure value P0 detected by the first pressure sensor 91 is the pressure value of the indoor unit and the outdoor unit, which can be used to determine whether the system pressure reaches below 50 kPa, thereby controlling the closing of the fifth solenoid valve 45 to maintain the pressure;

[0096] S605, continuously compare P0 with 50kPa. By continuously comparing P0 with 50kPa, it can be used to determine whether the system has been evacuated. If P0 is not less than 50kPa within 10 seconds, it means that the evacuation has not been completed, and the evacuation is continued to detect the pressure P0 of the first pressure sensor 91. If P0 is less than 50kPa for 10 seconds in a row, it means that the system has completed the first evacuation, and the fifth solenoid valve 45 can be closed to maintain the pressure.

[0097] S606, close the fifth solenoid valve 45. When P0 is less than 50 kPa for 10 consecutive seconds, it means that the system has completed the first evacuation, and the fifth solenoid valve 45 can be closed to maintain the pressure;

[0098] S607, detecting the pressure P0 of the first pressure sensor 91. During the pressure maintaining process, the pressure value P0 detected by the first pressure sensor 91 is the pressure value of the indoor unit and the outdoor unit, which can be used to determine whether the system can maintain the pressure, and thus determine whether the vacuuming is indeed completed;

[0099] S608, continuously compare P0 with 50kPa. Different from S604, the comparison in S608 is used to determine whether the system has completed pressure maintenance. If P0 is not less than 50kPa within 10 minutes, it means that the system pressure rebounds and the vacuuming is not complete. It is necessary to return to S602 to continue the vacuuming process. If P0 is less than 50kPa for 10 minutes in a row, it means that the system has been completely vacuumed and the system vacuuming process can be ended.

[0100] S609, turning off the vacuum pump 51. After determining that the system vacuuming is completed, turning off the vacuum pump 51.

[0101] S610, end, complete the system vacuum control method, and end the function.

[0102] When the air conditioning system pipeline processing device includes a refrigeration oil filling component and the operation mode is the system refrigeration oil filling mode, the first solenoid valve 41, the third solenoid valve 43, the fourth solenoid valve 44, and the fifth solenoid valve 45 are all controlled to be cut off, the second solenoid valve 42 and the sixth solenoid valve 46 are controlled to be turned on, and the oil pump 72 is controlled to operate to fill the first preset mass of refrigeration oil into the air conditioning system, and then the oil pump 72 is controlled to stop running and the sixth solenoid valve 46 is controlled to be cut off. At this time, the refrigeration oil enters the air conditioning system through the sixth solenoid valve 46-check valve 48-second solenoid valve 42-second interface 131 under the drive of the oil pump 72. The aforementioned first preset mass can be obtained by the change difference of the second weighing device 62. In this mode, the seventh solenoid valve 47 should be ensured to be in a cut-off state.

[0103] In some embodiments, when the air conditioning system pipeline processing device includes a refrigerant filling assembly, the refrigerant filling pipeline is connected to the first pipeline, and the operation mode is the system refrigerant filling mode, the seventh solenoid valve 47 and the second solenoid valve 42 are controlled to be turned on, the first solenoid valve 41, the third solenoid valve 43, the fourth solenoid valve 44, the fifth solenoid valve 45, and the sixth solenoid valve 46 are cut off, and at least part of the refrigerant in the refrigerant tank 81 is injected into the air conditioning system by using the pressure difference between the refrigerant tank 81 and the air conditioning system, and preferably, before the compressor 11 is operated, the throttling element 122 is controlled to be in a cut-off state to prevent the refrigerant from entering the compressor 11 during the process of being injected into the air conditioning system by the pressure difference. In this technical solution, the refrigerant is injected into the air conditioning system via the seventh solenoid valve 47, the one-way valve 48, the second solenoid valve 42, and the second interface 131 under the action of the pressure difference between the refrigerant tank 81 and the air conditioning system.

[0104] Preferably, during the process of connecting the charging refrigerant tank 81 with the air-conditioning system, a change value |△P0| of the system pressure P0 of the air-conditioning system within a preset time (for example, 1 minute) is obtained. When the change value |△P0| is not higher than a set pressure difference value (for example, 100 kPa), the compressor 11 is controlled to operate to increase the filling pressure of the refrigerant and ensure that the filling amount of the refrigerant meets the requirement. The compressor 11 is controlled to stop operating until the filling amount of the refrigerant injected into the air-conditioning system reaches a second preset mass, and the second solenoid valve 42 and the seventh solenoid valve 47 are controlled to be cut off, and the sum of the first preset mass and the second preset mass is equal to the mass change value.

[0105] Specifically Figure 6 Taking the example shown above, the operation logic of the system refrigeration oil filling mode and the system refrigerant filling mode is further explained as follows:

[0106] S701, start, the controller confirms the start, and the control method begins to execute.

[0107] S702, open the second solenoid valve 42 and the sixth solenoid valve 46, add oil first during the filling process, open the second solenoid valve 42 and the sixth solenoid valve 46, so that the refrigerant oil in the oil tank 71 can be filled into the indoor and outdoor refrigeration system (i.e., the air conditioning system) through the oil pump 72;

[0108] S703, turning on the oil pump 72, opening the sixth solenoid valve 46 of the oil circuit, and then turning on the oil pump 72 to start refueling the system;

[0109] S704, when the weighing value of the second weighing device 62 reaches M2, the oil pump 72 and the sixth solenoid valve 46 are closed, and M2 corresponds to the mass of refrigeration oil that needs to be added to the system, which is set by the installation and maintenance personnel; when the change value of the second weighing device 62 reaches M2, the refrigeration oil filling is completed, the oil pump 72 and the sixth solenoid valve 46 are closed, and the filling is completed;

[0110] S705, open the seventh solenoid valve 47. After the refueling process is completed, the refrigerant filling process needs to be carried out. Before filling, the seventh solenoid valve 47 should be opened to connect the refrigerant filling tank 81 with the internal and external refrigeration systems;

[0111] S706, detecting the change value |△P0| of the first pressure sensor 91 within 1 minute. During the filling process, the pressure value P0 detected by the first pressure sensor 91 is the pressure value of the indoor unit and the outdoor unit. The change value within the specified time can be used to determine whether the system is pressure balanced;

[0112] S707, compare |△P0| with 100 kPa, where |△P0| is the pressure change value detected by the first pressure sensor 91 within 1 minute. If it is greater than 100 kPa, it means that the system pressure has not been balanced, and the change value |△P0| of the first pressure sensor 91 within 1 minute can be continuously detected, and the refrigerant can be continuously injected into the system only by the pressure difference; if it is less than or equal to 100 kPa, it can be basically determined that the system pressure is balanced, and the compressor 11 needs to be turned on to continue injecting the required injection amount with the help of the compressor 11;

[0113] S708, turning on the compressor 11. When it is determined that |△P0|≤100 kPa, the compressor 11 is required to continue to be filled to the required filling amount, so the compressor 11 is turned on;

[0114] S709, when the weighing value of the second weighing device 62 reaches M1, the second solenoid valve 42, the seventh solenoid valve 47 and the compressor 11 are closed. The M1 value corresponds to the amount of recovered refrigerant weighed by the first weighing device 61. When the total change of the oil tank 71 and the charging refrigerant tank 81 weighed by the second weighing device 62 is the same as M1, the filling process is completed, and the second solenoid valve 42, the seventh solenoid valve 47 and the compressor 11 are closed;

[0115] S710, end, complete the refrigeration oil filling and refrigerant control method, and end the function.

[0116] As a preferred embodiment, the refrigerant recovery mode, system cleaning mode, system vacuum mode, system refrigeration oil filling mode and system refrigerant filling mode are executed in sequence, so that the automatic operation of each processing step of refrigerant recovery, system cleaning, system vacuum mode, system refrigeration oil filling and system refrigerant filling of the old air-conditioning system can be realized.

[0117] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A pipeline processing device for an air conditioning system, characterized in that: The invention comprises a refrigerant drive component, wherein the refrigerant drive component comprises a compressor (11), a first pipeline controllably connected to the air intake port of the compressor (11), and a second pipeline controllably connected to the air exhaust port of the compressor (11), wherein the first pipeline has a first interface (121) connected to a first target refrigerant pipe of an air-conditioning system, and the second pipeline has a second interface (131) connected to a second target refrigerant pipe of the air-conditioning system, and a throttling element (122) is connected in series in the first pipeline. The invention also comprises a refrigerant recovery tank (21), wherein the refrigerant recovery tank (21) is controllably connected to the air exhaust port via the refrigerant recovery pipeline, and the second pipeline also has a system flushing interface (132), wherein the system flushing interface (132) is used to communicate with a cleaning component (3), and the cleaning component (3) is used to provide a pressure cleaning fluid, and the first pipeline also has an emptying port (123) for discharging the pressure cleaning fluid.

2. The air conditioning system pipeline processing device according to claim 1, characterized in that: A first solenoid valve (41) is connected in series to the first pipeline, a second solenoid valve (42) is connected in series to the second pipeline, a third solenoid valve (43) is connected in series to the pipeline between the refrigerant recovery tank (21) and the exhaust port, a fourth solenoid valve (44) is connected in series to the pipeline between the drain port (123) and the first pipeline, the refrigerant recovery pipeline is connected to the second pipeline, and the connection position is between the exhaust port and the second solenoid valve (42); and / or the pressure cleaning fluid is nitrogen.

3. The air conditioning system pipeline processing device according to claim 2, characterized in that: A filter (124) is also connected in series on the first pipeline between the first solenoid valve (41) and the throttling element (122); and / or the compressor (11), the throttling element (122), the third solenoid valve (43), the refrigerant recovery tank (21) and the pipelines therebetween are located on a first weighing device (61).

4. The air conditioning system pipeline processing device according to claim 2, characterized in that: It also includes a vacuum pump (51), the vacuum pump (51) is connected to the second pipeline through a third pipeline, and the connection position between the third pipeline and the second pipeline is between the second solenoid valve (42) and the second interface (131), and a fifth solenoid valve (45) is connected in series to the third pipeline.

5. The air conditioning system pipeline processing device according to claim 4, characterized in that: The invention also comprises a refrigeration oil filling assembly, the refrigeration oil filling assembly comprising an oil tank (71) and an oil pump (72), the inlet of the oil pump (72) being connected to the oil tank (71), the outlet of the oil pump (72) being controllably connected to the second pipeline via a fourth pipeline, and the connection position between the fourth pipeline and the second pipeline is between the exhaust port of the compressor (11) and the second solenoid valve (42), and a sixth solenoid valve (46) is connected in series to the fourth pipeline.

6. The air conditioning system pipeline processing device according to claim 5, characterized in that: It also includes a refrigerant filling component, which includes a refrigerant filling tank (81), the outlet of the refrigerant filling tank (81) is connected to the fourth pipeline through a refrigerant filling pipeline, and the connecting position between the refrigerant filling pipe and the fourth pipeline is between the sixth solenoid valve (46) and the second solenoid valve (42), and a seventh solenoid valve (47) is connected in series to the refrigerant filling pipeline.

7. The air conditioning system pipeline processing device according to claim 6, characterized in that: The refrigerant filling pipeline is also connected to the first pipeline through a fifth pipeline, and the connection position between the fifth pipeline and the first pipeline is between the first solenoid valve (41) and the throttling element (122), and the throttling element (122) is an electronic expansion valve; and / or the oil tank (71) and the refrigerant filling tank (81) are simultaneously on the second weighing device (62).

8. The air conditioning system pipeline processing device according to claim 7, characterized in that: A one-way valve (48) is also connected in series to the fourth pipe. The one-way valve (48) is located between the seventh solenoid valve (47) and the second solenoid valve (42), and the conducting direction of the one-way valve (48) is from the seventh solenoid valve (47) to the second solenoid valve (42).

9. A control method for an air conditioning system pipeline processing device according to any one of claims 2 to 8, characterized in that: The steps include: Acquire the operation mode of the air conditioning system pipeline processing device; When the operation mode is a refrigerant recovery mode, obtaining the real-time tank pressure Ps in the refrigerant recovery tank (21); When the real-time pressure Ps in the tank is lower than the high pressure limit P1 of the refrigerant recovery tank (21), the first solenoid valve (41) and the third solenoid valve (43) are controlled to be turned on, the second solenoid valve (42) is controlled to be turned off, and the compressor (11) is controlled to operate; and when the suction pressure Pi of the compressor (11) is lower than the low pressure limit P2, the first solenoid valve (41) and the third solenoid valve (43) are controlled to be turned off, and the compressor (11) is controlled to stop operating; When the real-time pressure Ps in the tank is not lower than the high pressure limit P1 of the refrigerant recovery tank (21), a high pressure alarm is issued.

10. The control method according to claim 9, characterized in that: When the air conditioning system pipeline processing device includes a first weighing device (61), after the suction pressure Pi of the compressor (11) is lower than the low pressure limit value P2, and the first solenoid valve (41) and the third solenoid valve (43) are controlled to be cut off, the mass change value of the components on the first weighing device (61) is obtained.

11. The control method according to claim 10, characterized in that: When the operation mode is the system cleaning mode, the first solenoid valve (41), the second solenoid valve (42) and the fourth solenoid valve (44) are controlled to be in a cut-off state, and a pressure cleaning fluid is introduced into the air-conditioning system. When the system pressure P0 of the air-conditioning system is greater than the emptying limit value P3, the fourth solenoid valve (44) is controlled to be turned on to realize the emptying of the pressure cleaning fluid.

12. The control method according to claim 11, characterized in that: The fourth solenoid valve (44) is emptied multiple times, and between two emptying cycles the fourth solenoid valve (44) is turned on for a first preset time period.

13. The control method according to claim 11, characterized in that: When the air conditioning system pipeline processing device includes a vacuum pump (51) and the operation mode is a system vacuuming mode, the fifth solenoid valve (45) is controlled to be turned on, the first solenoid valve (41), the second solenoid valve (42), and the fourth solenoid valve (44) are all turned off, and the vacuum pump (51) is controlled to operate.

14. The control method according to claim 13, characterized in that: The system pressure P0 of the air conditioning system is obtained during the operation of the vacuum pump (51), and when the system pressure P0 is lower than a preset vacuum degree for a second consecutive preset time period, the fifth solenoid valve (45) is controlled to be cut off.

15. The control method according to claim 14, characterized in that: During the third consecutive preset time period after the fifth solenoid valve (45) is cut off, the relationship between the system pressure P0 and the preset vacuum degree is continuously obtained; when the system pressure P0 is less than the preset vacuum degree for the third consecutive preset time period, the vacuum pump (51) is controlled to stop operating; when the system pressure P0 is not less than the preset vacuum degree for the third consecutive preset time period, the fifth solenoid valve (45) is controlled to be turned on again, and the third preset time period is greater than the second preset time period.

16. The control method according to claim 13, characterized in that: When the air conditioning system pipeline processing device includes a refrigeration oil filling component and the operating mode is a system refrigeration oil filling mode, the first solenoid valve (41), the third solenoid valve (43), the fourth solenoid valve (44), and the fifth solenoid valve (45) are all controlled to be cut off, the second solenoid valve (42) and the sixth solenoid valve (46) are controlled to be turned on, and the oil pump (72) is controlled to operate to fill the air conditioning system with a first preset mass of refrigeration oil, and then the oil pump (72) is controlled to stop operating and the sixth solenoid valve (46) is controlled to be cut off.

17. The control method according to claim 16, characterized in that: When the air-conditioning system pipeline processing device includes a refrigerant filling component, the refrigerant filling pipeline is connected to the first pipeline and the operating mode is the system refrigerant filling mode, the seventh solenoid valve (47) and the second solenoid valve (42) are controlled to be turned on, and the first solenoid valve (41), the third solenoid valve (43), the fourth solenoid valve (44), the fifth solenoid valve (45) and the sixth solenoid valve (46) are controlled to be turned off, and at least part of the refrigerant in the refrigerant tank (81) is injected into the air-conditioning system by utilizing the pressure difference between the refrigerant tank (81) and the air-conditioning system.

18. The control method according to claim 17, characterized in that: During the process of connecting the refrigerant filling tank (81) with the air-conditioning system, a change value |△P0| of the system pressure P0 of the air-conditioning system within a preset time is obtained. When the change value |△P0| is not higher than a set pressure difference value, the compressor (11) is controlled to operate until the amount of refrigerant injected into the air-conditioning system reaches a second preset mass, at which time the compressor (11) is controlled to stop operating, and the second solenoid valve (42) and the seventh solenoid valve (47) are controlled to be cut off, and the sum of the first preset mass and the second preset mass is equal to the mass change value.

19. The control method according to claim 17, characterized in that: The refrigerant recovery mode, system cleaning mode, system vacuuming mode, system refrigeration oil filling mode and system refrigerant filling mode are executed in sequence.

Images