Refrigerant filling system

Abstract

The embodiment of the present application discloses a refrigerant filling system, which comprises a high-pressure end connector, a low-pressure end connector, a refrigerant filling pipeline, a refrigerant output pipeline, a vacuum pipeline and a control circuit, a high-pressure end vacuum valve is arranged between the high-pressure end connector and the vacuum pipeline, and a positive pressure sensor is arranged on a branch of the vacuum pipeline; when the control circuit receives a first pressure signal sent by the positive pressure sensor in a post-filling leak detection mode, an alarm signal is sent outward. Thus, after filling is completed, the high-pressure end filling valve is closed and the high-pressure end vacuum valve is opened, the detection of whether the high-pressure end filling port leaks can be realized, refrigerant leakage caused by the incomplete sealing of the high-pressure end filling port after filling is prevented, the refrigeration effect of the vehicle air conditioning system is ensured, and the pollution of the leaked refrigerant to the environment is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle air conditioning technology, in particular to a refrigerant filling system. BACKGROUND

[0002] Nowadays, a large number of vehicles are equipped with air conditioning systems, and the vehicle needs to be filled with refrigerant when it is produced. The existing refrigerant filling process is to first perform positive pressure leak detection and vacuum leak detection on the vehicle air conditioning system, then inject a predetermined amount of refrigerant into the air conditioning system through a filling gun connected with the vehicle filling port, and then remove the filling gun from the filling port after the filling is completed. In the filling process, the needle of the filling gun pushes open the one-way valve at the filling port, and after the filling gun is removed after the filling is completed, if the one-way valve at the filling port of the vehicle air conditioning system does not completely reset, a reliable seal cannot be formed on the air conditioning system, and the refrigerant will leak out of the filling port, causing the refrigerant in the air conditioning system to be insufficient and affecting the refrigeration effect, and the leaked refrigerant will pollute the environment. SUMMARY

[0003] The purpose of the embodiment of the present application is to provide a refrigerant filling system, which is beneficial to reduce the risk of leakage after the refrigerant filling of the vehicle air conditioning system is completed.

[0004] The embodiment of the present application provides a refrigerant filling system, which comprises a high-pressure end connector, a low-pressure end connector, a refrigerant filling pipeline, a refrigerant output pipeline, a vacuum pipeline and a control circuit; one end of the refrigerant filling pipeline is provided with a high-pressure end filling valve; the refrigerant output pipeline is connected between the high-pressure end connector and the high-pressure end filling valve; the vacuum pipeline has a first starting end and a second starting end, the first starting end is provided with a high-pressure end vacuum valve, the second starting end is connected to the low-pressure end connector, the high-pressure end vacuum valve is connected to one branch of the refrigerant output pipeline, a positive pressure sensor is arranged on one branch of the vacuum pipeline, and the positive pressure sensor is in communication with the high-pressure end connector when the high-pressure end vacuum valve is opened; the control circuit is electrically connected with the positive pressure sensor and the high-pressure end vacuum valve; wherein the control circuit is configured to: control the high-pressure end filling valve to be closed and the high-pressure end vacuum valve to be opened after the refrigerant filling is completed, so that the high-pressure end connector is in communication with the positive pressure sensor, and the refrigerant filling system enters a post-filling leak detection mode; and when a first pressure signal sent by the positive pressure sensor is received in the post-filling leak detection mode, an alarm signal is sent outward, and the first pressure signal represents that the refrigerant pressure is detected in the vacuum pipeline.

[0005] In some embodiments, the vacuum pipeline comprises a total vacuum valve and a vacuum pump arranged in series, the total vacuum valve is connected to the vacuum pump, and the total vacuum valve is arranged between the first starting end and the vacuum pump and between the second starting end and the vacuum pump.

[0006] In some embodiments, the control circuit is further electrically connected with the vacuum pump and the total vacuum valve; and the control circuit is further configured to, in the vacuuming mode, control the vacuum pump to start, and control the total vacuum valve and the high-pressure end vacuum valve to open.

[0007] In some embodiments, the vacuuming pipeline further comprises an equalizing branch connected between the total vacuum valve and the high-pressure end vacuum valve, and the equalizing branch comprises an equalizing valve.

[0008] In some embodiments, the refrigerant filling pipeline further comprises a filling control valve and a flow meter, and the flow meter, the filling control valve and the high-pressure end filling valve are arranged in series.

[0009] In some embodiments, the control circuit is further configured to, in the filling mode, control the high-pressure end vacuum valve to close, and control the high-pressure end filling valve to open.

[0010] In some embodiments, the refrigerant filling system further comprises a signal output device, the control circuit is electrically connected with the signal output device, and the control circuit is configured to send the alarm signal to the signal output device; and the signal output device is configured to alarm after receiving the alarm signal.

[0011] In some embodiments, the refrigerant filling system comprises a filling gun, and the high-pressure end connector is arranged on the filling gun; and the filling gun comprises a clamping cylinder configured to be connected with a high-pressure end filling port of a vehicle air conditioning system.

[0012] In some embodiments, the high-pressure end connector comprises a first valve body and a first needle, the first valve body has a first channel for fluid flow, and the first needle is movably arranged in the first channel; and the high-pressure end filling port comprises a needle valve assembly, the needle valve assembly comprises a second valve body, a second needle movably arranged in the second valve body, and an elastic element elastically connecting the second valve body and the second needle; wherein when the high-pressure end connector is connected with the high-pressure end filling port, the first needle has a first position and a second position opposite to the first position, the first needle is arranged at the first position to push the second needle of the high-pressure end filling port to open the high-pressure end filling port, and the first needle is arranged at the second position to be away from the second needle to make the second needle rebound under the action of the elastic element to close the high-pressure end filling port.

[0013] In some embodiments, the control circuit is further configured to, after the refrigerant filling is completed and before the high-pressure end vacuum valve is opened, control the first needle of the high-pressure end connector to move to the first position.

[0014] The embodiment of the present application provides a refrigerant filling system, which comprises a high-pressure end connector, a low-pressure end connector, a refrigerant filling pipeline, a refrigerant output pipeline, a vacuum pipeline and a control circuit, a high-pressure end vacuum valve is arranged between the high-pressure end connector and the vacuum pipeline, and a positive pressure sensor is arranged on a branch of the vacuum pipeline; when the control circuit receives a first pressure signal sent by the positive pressure sensor in a post-filling leak detection mode, an alarm signal is sent out. Thus, after filling is completed, the high-pressure end filling valve is closed and the high-pressure end vacuum valve is opened, detection on whether the high-pressure end filling port exists leakage can be realized, refrigerant leakage caused by the fact that the high-pressure end filling port is not completely sealed after filling is prevented, the refrigerating effect of the vehicle air conditioning system is ensured, and meanwhile, pollution to the environment caused by the leaked refrigerant is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other objects, features and advantages of the present application will become more apparent from the following description of the embodiments of the present application taken with reference to the accompanying drawings, in which:

[0016] Figure 1 is a principle schematic diagram of the refrigerant filling system of one embodiment of the present application;

[0017] Figure 2 is a schematic block diagram of the refrigerant filling system of one embodiment of the present application;

[0018] Figure 3 is a structural schematic diagram of the filling gun of one embodiment of the present application;

[0019] Figure 4 is a structural schematic diagram of the high-pressure end filling port of the vehicle air conditioning system of one embodiment of the present application;

[0020] Figure 5 is a schematic diagram of the vehicle air conditioning system in a vacuum mode of one embodiment of the present application;

[0021] Figure 6 is a schematic diagram of the vehicle air conditioning system in a filling mode of one embodiment of the present application;

[0022] Figure 7 is a schematic diagram of the vehicle air conditioning system in a post-filling leak detection mode of one embodiment of the present application.

[0023] 100-refrigerant charging system; 200-vehicle air conditioning system; 1-high pressure end connector; 2-low pressure end connector; 3-refrigerant charging pipeline; 4-refrigerant output pipeline; 5-evacuation pipeline; 6-high pressure end charging valve; 7-high pressure end vacuum valve; 8-positive pressure sensor; 9-vacuum pump; 10-total vacuum valve; 11-charging control valve; 12-flow meter; 13-equalization branch; 14-equalization valve; 15-signal output device; 16-control circuit; 17-high pressure end charging port; 18-low pressure end charging port; 19-first needle; 20-second needle; 21-refrigerant tank; 22-second valve body. DETAILED DESCRIPTION

[0024] The present application is described in detail below based on examples, but the present application is not limited to only these examples. In the following detailed description of the present application, some specific details are described in detail. The present application can also be fully understood without the description of these details by those skilled in the art. In order to avoid confusion of the essence of the present application, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0025] In addition, those of ordinary skill in the art will understand that the drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0026] Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".

[0027] In the description of the present application, it should be understood that the terms "first", "second", and the like are used only for descriptive purposes and should not be construed as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0028] Figure 1 is a schematic diagram of the principle of a refrigerant charging system according to an embodiment of the present application. Referring to Figure 1 , the refrigerant charging system 100 includes a high pressure end connector 1, a low pressure end connector 2, a refrigerant charging pipeline 3, a refrigerant output pipeline 4, and an evacuation pipeline 5.

[0029] The vehicle air conditioning system 200 has two charging ports, namely a high pressure end charging port 17 and a low pressure end charging port 18. The high pressure end connector 1 is used to connect with the high pressure end charging port 17 of the vehicle air conditioning system 200, and the low pressure end connector 2 is used to connect with the low pressure end charging port 18 of the vehicle air conditioning system 200. When the refrigerant charging system 100 charges the vehicle air conditioning system 200, the refrigerant enters the high pressure end charging port 17 from the high pressure end connector 1, and then is injected into the vehicle air conditioning system 200.

[0030] One end of the refrigerant filling pipeline 3 is provided with a high-pressure end filling valve 6, and the refrigerant output pipeline 4 is connected between the high-pressure end connector 1 and the high-pressure end filling valve 6. The refrigerant filling pipeline 3 is used to deliver refrigerant to the refrigerant output pipeline 4 and the high-pressure end connector 1 during refrigerant filling. The high-pressure end filling valve 6 is used to control the fluid communication state between the refrigerant filling pipeline 3 and the refrigerant output pipeline 4; when the high-pressure end filling valve 6 is opened, the refrigerant can pass through the high-pressure end filling valve 6 into the refrigerant output pipeline 4, and then flow from the high-pressure end connector 1 to the high-pressure end filling port 17 of the vehicle air conditioning system 200; when the high-pressure end filling valve 6 is closed, the refrigerant filling pipeline 3 is shut off, and the refrigerant filling stops.

[0031] The other end of the refrigerant filling pipeline 3 is used to be connected with a refrigerant storage device (such as a refrigerant tank 21), which supplies refrigerant to the refrigerant filling pipeline 3. In some embodiments, the refrigerant filling pipeline 3 includes a filling control valve 11 and a flow meter 12, which are connected in series in the refrigerant filling pipeline 3. The flow meter 12 is used to detect the refrigerant flow to facilitate the control of the filling amount of the refrigerant, so as to realize quantitative filling.

[0032] The vacuum pipeline 5 is used to vacuum the circuit of the vehicle air conditioning system 200 before the refrigerant is injected, so as to create a system vacuum environment for subsequent refrigerant filling. The vacuum pipeline 5 includes a vacuum pump 9 and a total vacuum valve 10, the vacuum pump 9 is arranged at the other end of the vacuum pipeline 5, and the total vacuum valve 10 is connected to the vacuum pump 9. The vacuum pump 9 is used for vacuumizing, and the total vacuum valve 10 is used to control the on-off state of the vacuum pipeline 5, and the vacuum operation can be performed when the total vacuum valve 10 is opened.

[0033] In this embodiment, the vacuum pipeline 5 has two branch ends for vacuumizing, i.e., having a first initial end and a second initial end. During vacuumizing, the first initial end and the second initial end are used to respectively communicate with the high-pressure end filling port 17 and the low-pressure end filling port 18 of the vehicle air conditioning system 200 to perform vacuumizing operation. The first initial end is provided with a high-pressure end vacuum valve 7, and the second initial end is connected to the low-pressure end connector 2. The high-pressure end vacuum valve 7 is connected to one branch of the refrigerant output pipeline 4, and then can be connected to the high-pressure end connector 1 through the main pipeline of the refrigerant output pipeline 4. When the total vacuum valve 10 is opened, the vacuum pipeline 5 is in fluid communication with the low-pressure end connector 2, and at this time the vacuum operation can be performed through the low-pressure end connector 2. When the total vacuum valve 10 and the high-pressure end vacuum valve 7 are both opened, the vacuum pipeline 5 and the refrigerant output pipeline 4 are in fluid communication; thus, the vacuum pipeline 5 can be connected to the high-pressure end connector 1 and the low-pressure end connector 2 respectively, and the circuit of the vehicle air conditioning system 200 can be vacuumized through the high-pressure end connector 1 and the low-pressure end connector 2 at the same time.

[0034] A branch of the vacuum pipeline 5 is provided with a positive pressure sensor 8. When the high-pressure end vacuum valve 7 is opened, the vacuum pipeline 5 is in communication with the refrigerant output pipeline 4, so that the positive pressure sensor 8 is in communication with the high-pressure end connector 1. The branch where the positive pressure sensor 8 is located can be between the total vacuum valve 10 and the high-pressure end vacuum valve 7. The positive pressure sensor 8 can detect the pressure change in the pipeline of the refrigerant charging system 100 or the pipeline of the refrigerant charging system 100 and the vehicle air conditioning system 200, and further realize the effect of leak detection.

[0035] In some embodiments, the vacuum pipeline 5 can also be provided with a vacuum pressure sensor. The vacuum pressure sensor can detect the vacuum degree in the vacuum pipeline 5, facilitate the control of the vacuum process of the vehicle air conditioning system 200, and be used for vacuum leak detection of the vehicle air conditioning system 200.

[0036] In some embodiments, the vacuum pipeline 5 further includes an equalization branch 13 connected between the total vacuum valve 10 and the high-pressure end vacuum valve 7. The equalization branch 13 includes an equalization valve 14. After the vehicle air conditioning system 200 is vacuumed, the pressure in the vacuum pipeline 5 is equalized by the equalization valve 14 before the refrigerant charging begins.

[0037] Referring to Figure 2 The refrigerant charging system 100 further includes a control circuit 16, which can be used to control the operation of various electric valves, pumps or other electric mechanisms in the refrigerant charging system 100. For example, the control circuit 16 can be electrically connected with the vacuum pump 9, the total vacuum valve 10, the high-pressure end vacuum valve 7, the high-pressure end charging valve 6, the charging control valve 11, the equalization valve 14 and the positive pressure sensor 8. The refrigerant charging system 100 can include an input device electrically connected with the control circuit 16. The operator can input operation instructions to the control circuit 16 by operating the input device, and the control circuit 16 controls the corresponding mechanisms to work according to the operation instructions to realize the corresponding functions. The input device can include a key switch, a touch screen, a keyboard or other types of input devices.

[0038] In some embodiments, the refrigerant charging system 100 can further include a signal output device 15. The signal output device 15 is used to output signals related to the working state of the refrigerant charging system 100, so that the operator can understand the progress of the refrigerant charging work. The signal output device 15 can include a display, a light-emitting element, a loudspeaker or other forms of signal output devices. When the refrigerant charging system 100 detects refrigerant leakage, mechanism failure or other undesirable working states, the control circuit 16 can control the signal output device 15 to output corresponding prompt information.

[0039] The refrigerant charging system 100 can be partially or entirely embodied in the form of a charging gun. Referring to Figure 3, the high-pressure end connector 1 is arranged on the filling gun, and when the refrigerant is filled, the filling gun is connected with the high-pressure end filling port 17 and the low-pressure end filling port 18 of the vehicle air conditioning system 200. In an alternative embodiment, the low-pressure end connector 2 and the high-pressure end connector 1 are arranged on the same filling gun and are spaced apart, and the distance between the high-pressure end connector 1 and the low-pressure end connector 2 is determined according to the distance between the high-pressure end filling port 17 and the low-pressure end filling port 18 of the vehicle air conditioning system, so that the high-pressure end connector 1 and the high-pressure end filling port 17 and the low-pressure end connector 2 and the low-pressure end filling port 18 can be connected at the same time. In another alternative embodiment, the filling gun is two, and the two filling guns are high-pressure end filling gun and low-pressure end filling gun, and the high-pressure end filling gun and the low-pressure end filling gun are separated for the operator to operate respectively, and the high-pressure end filling port 17 is arranged on the high-pressure end filling gun, and the low-pressure end filling port 18 is arranged on the low-pressure end filling gun.

[0040] The specific connection mode between the high-pressure end connector 1 and the high-pressure end filling port 17 and the low-pressure end connector 2 and the low-pressure end filling port 18 can be selected according to actual needs, for example, it can be threaded connection, clamping type connection, etc. In this embodiment, the filling gun is connected with the filling port of the vehicle air conditioning system 200 by clamping. The filling gun is provided with a clamping cylinder, and the control circuit 16 is electrically connected with the clamping cylinder for controlling the clamping cylinder to work to realize clamping and loosening of the filling gun. The clamping cylinder is used to connect with the corresponding filling port of the vehicle air conditioning system, that is, to connect the high-pressure end connector 1 with the high-pressure end filling port 17 and to connect the low-pressure end connector 2 with the low-pressure end filling port 18. The low-pressure end connector 2 and the high-pressure end connector 1 can adopt similar clamping structure.

[0041] Referring to Figure 3 and Figure 4 , the high-pressure end connector 1 comprises a first valve body having a first channel for fluid flow. The high-pressure end connector 1 also has a first needle 19 movably arranged in the first channel. In some application scenarios, the high-pressure end filling port 17 of the vehicle can comprise a needle valve assembly comprising a second valve body 22 and a movable second needle 20 arranged on the second valve body 22. A sealing structure can be arranged at the contact surface between the second needle 20 and the second valve body 22 to enhance the sealing performance. When the high-pressure end connector 1 is connected with the high-pressure end filling port 17, the first needle 19 has a first position and a second position. The needle valve assembly can be a one-way valve similar to a valve core structure, when the first needle 19 moves to the first position, the second needle 20 is pushed open, the high-pressure end filling port 17 is opened, and the pipeline of the vehicle air conditioning system is connected with the outside, so that the high-pressure end filling port 17 can be used for vacuumizing operation and refrigerant filling operation. The control of the first needle 19 can be linked with the opening / closing of the high-pressure end filling valve 6 and / or the high-pressure end vacuum valve 7, or can be independently operated.

[0042] The needle valve assembly can further comprise a resilient element (not shown in the figure) which elastically connects the second needle 20 and the second valve body 22, so that the needle valve assembly is kept closed when not subjected to external force. The resilient element can be a resilient part or structure such as a spring. When the first needle 19 moves inward to abut against the second needle 20, the resilient element stores elastic potential energy; when the first needle 19 moves to the second position away from the second needle 20, the resilient element releases the elastic potential energy to reset the second needle 20 and close the high-pressure end filling port 17 to maintain air tightness. During filling, the first needle 19 moves to the first position to open the high-pressure end filling port 17 by abutting against the second needle 20, so as to realize the communication between the pipeline of the vehicle air conditioning system 200 and the pipeline of the refrigerant filling system 100. After filling is completed, the control circuit controls the first needle 19 of the high-pressure end connector 1 to return to the first position before controlling the high-pressure end vacuum valve 7 to open, and the second needle 20 returns to the position under the action of the resilient element to realize self-sealing of the high-pressure end filling port 17. However, in actual refrigerant filling work, the second needle 20 may not return to the position, and the refrigerant in the vehicle air conditioning system 200 may escape from the high-pressure end filling port 17. By using the refrigerant filling system 100 of the embodiment of the present application, the sealing condition of the vehicle air conditioning system 200 after refrigerant filling can be detected.

[0043] As can be easily understood by those skilled in the art, the low-pressure end filling port 18 can have a similar structure to the high-pressure end filling port 17, i.e., the low-pressure end filling port 18 can also comprise a needle valve assembly. The low-pressure end connector 2 can have the same or similar structure as the high-pressure end connector 1, i.e., also has a movable first needle 19 to open the low-pressure end filling port 18.

[0044] The following refers to Figures 5-7 A feasible refrigerant filling process and principle of the refrigerant filling system 100 of the embodiment of the present application will be described. The refrigerant filling process can comprise the following steps:

[0045] (1) Vacuumizing step: connect the high-pressure end connector 1 with the high-pressure end filling port 17 of the vehicle air conditioning system 200, and connect the low-pressure end connector 2 with the low-pressure end filling port 18 of the vehicle air conditioning system 200. The refrigerant filling system 100 enters the vacuumizing mode. Figure 5 The flow direction of fluid in the vacuumizing mode is shown. Referring to Figure 5 The control circuit 16 controls the vacuum pump 9 to start, and controls the total vacuum valve 10 and the high-pressure end vacuum valve 7 to open, and the vacuumizing pipeline 5 simultaneously performs vacuumizing operation on the circuit of the vehicle air conditioning system 200 from the high-pressure end connector 1 and the low-pressure end connector 2, so as to make the circuit of the vehicle air conditioning system 200 reach a predetermined vacuum degree.

[0046] (2) Filling step: after the vacuuming is completed, the filling mode is entered. The control circuit 16 controls the total vacuum valve 10 and the high-pressure end vacuum valve 7 to be closed, and controls the equalizing valve 14 to be opened, so as to equalize the pressure of the vacuuming pipeline 5, and restore the pressure in the pipeline to the normal atmospheric pressure. Figure 6 The flow direction of the fluid in the filling mode is shown. Referring to Figure 6 After the equalizing is completed, the control circuit 16 controls the high-pressure end filling valve 6 to be opened, and the refrigerant is injected into the high-pressure end filling port 17 through the refrigerant filling pipeline 3, the refrigerant output pipeline 4 and the high-pressure end connector 1. The flow meter 12 can display the filling amount of the refrigerant. When the filling amount of the refrigerant reaches the set filling amount, the filling is completed.

[0047] (3) Post-filling leakage detection step: after the filling is completed, the control circuit 16 controls the high-pressure end filling valve 6 to be closed, and then controls the high-pressure end vacuum valve 7 to be opened, so that the refrigerant filling system 100 enters the post-filling leakage detection mode. At this time, the high-pressure end connector 1 is in fluid communication with the positive pressure sensor 8. Figure 7 The flow direction of the fluid when the refrigerant leakage occurs in the post-filling leakage detection mode is shown. Referring to Figure 7 If the needle of the high-pressure end filling port 17 of the vehicle air conditioning system 200 does not rebound to the position, the refrigerant will escape from the high-pressure end filling port 17, enter the vacuuming pipeline 5 through the high-pressure end connector 1 and the refrigerant output pipeline 4, and the positive pressure sensor 8 can detect the pressure rise caused by the leaked refrigerant, and generate a first pressure signal. The first pressure signal represents that the refrigerant pressure is detected in the vacuuming pipeline 5. When the control circuit 16 receives the first pressure signal sent by the positive pressure sensor 8 in the leakage detection state, the control circuit 16 sends an alarm signal to the outside. In some application scenarios, the control circuit 16 can send the alarm signal to the signal output device 15, and the signal output device 15 alarms through sound, image or other ways after receiving the alarm signal. The staff can perform corresponding operation according to the alarm prompt to eliminate the fault.

[0048] The refrigerant filling system 100 of the embodiment of the present application can realize the detection of whether the high-pressure end filling port 17 leaks by connecting the vehicle air conditioning system 200 with the vacuuming pipeline 5 and the positive pressure sensor on the vacuuming pipeline after the filling is completed, so as to prevent the refrigerant leakage caused by the second needle 20 of the high-pressure end filling port 17 not rebounding to the position, avoid the environmental pollution, and ensure the refrigeration effect of the vehicle air conditioning system 200. At the same time, compared with the way of setting a separate detection device to detect the leakage after the refrigerant is filled, the post-filling leakage detection through the refrigerant filling system 100 can effectively improve the detection efficiency, and save the detection station, personnel and working hours after the filling.

[0049] The above merely illustrates the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A refrigerant filling system characterized by comprising: The refrigerant charging system comprises: a high-pressure end connector; a low-pressure end connector; a refrigerant charging pipeline, one end of the refrigerant charging pipeline being provided with a high-pressure end charging valve; a refrigerant output pipeline, the refrigerant output pipeline being connected between the high-pressure end connector and the high-pressure end charging valve; a vacuum pipeline having a first starting end and a second starting end, the first starting end being provided with a high-pressure end vacuum valve, the second starting end being connected to the low-pressure end connector, the high-pressure end vacuum valve being connected to one branch of the refrigerant output pipeline, one branch of the vacuum pipeline being provided with a positive pressure sensor, the positive pressure sensor being in communication with the high-pressure end connector when the high-pressure end vacuum valve is opened; and a control circuit electrically connected to the positive pressure sensor and the high-pressure end vacuum valve; wherein the control circuit is configured to: control the high-pressure end charging valve to be closed and the high-pressure end vacuum valve to be opened after refrigerant charging is completed, so that the high-pressure end connector is in communication with the positive pressure sensor, and the refrigerant charging system enters a post-charging leak detection mode; and when a first pressure signal sent by the positive pressure sensor is received in the post-charging leak detection mode, an alarm signal is sent outward, the first pressure signal indicating that refrigerant pressure is detected in the vacuum pipeline.

2. The refrigerant filling system according to claim 1, characterized in that The vacuum pipeline comprises a total vacuum valve and a vacuum pump arranged in series, the total vacuum valve being connected to the vacuum pump, the total vacuum valve being arranged between the first starting end and the vacuum pump and between the second starting end and the vacuum pump.

3. The refrigerant filling system according to claim 2, characterized in that The control circuit is also electrically connected to the vacuum pump and the total vacuum valve; the control circuit is also configured to control the vacuum pump to be started and control the total vacuum valve and the high-pressure end vacuum valve to be opened in a vacuum mode.

4. The refrigerant charging system according to claim 2, characterized by The vacuum pipeline further comprises an equalization branch, the equalization branch being connected between the total vacuum valve and the high-pressure end vacuum valve, the equalization branch comprising an equalization valve.

5. The refrigerant filling system according to claim 1, wherein The refrigerant charging pipeline further comprises a charging control valve and a flow meter, the flow meter, the charging control valve and the high-pressure end charging valve being arranged in series.

6. The refrigerant filling system according to claim 1, wherein The control circuit is also configured to control the high-pressure end vacuum valve to be closed and control the high-pressure end charging valve to be opened in a charging mode.

7. The refrigerant filling system according to claim 1, wherein The refrigerant charging system further comprises a signal output device, the control circuit being electrically connected to the signal output device, the control circuit being configured to send the alarm signal to the signal output device; the signal output device is configured to give an alarm prompt after receiving the alarm signal.

8. The refrigerant filling system according to claim 1, wherein The refrigerant charging system comprises a charging gun, the high-pressure end connector being arranged in the charging gun; the charging gun has a clamping cylinder configured to be connected to a high-pressure end charging port of a vehicle air conditioning system.

9. The refrigerant filling system according to claim 8, characterized in that The high-pressure end connector comprises a first valve body and a first needle, the first valve body having a first channel for fluid flow, the first needle being movably arranged in the first channel; the high-pressure end charging port comprises a needle valve assembly, the needle valve assembly comprising a second valve body, a second needle movably arranged in the second valve body, and an elastic element elastically connecting the second valve body and the second needle; Wherein, when the high-pressure end connector is connected with the high-pressure end filler, the first thimble has opposite first and second positions, the first thimble opens the second thimble on the high-pressure end filler to make the high-pressure end filler open when the first thimble is in the first position, and the first thimble is away from the second thimble to make the second thimble rebound under the action of the elastic element to make the high-pressure end filler close when the first thimble is in the second position.

10. The refrigerant charging system according to claim 9, characterized by The control circuit is further configured to: Before the high-pressure end vacuum valve is opened after the refrigerant filling is completed, the first thimble of the high-pressure end connector is controlled to move to the first position.

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