A rapid exhaust system and a test system

Abstract

The present invention discloses a fast exhaust system and a test system. The fast exhaust system includes: an exhaust valve for communicating with a vehicle refrigerant pipeline; a vacuum exhaust section including a vacuum exhaust outlet valve, a vacuum exhaust tank, and a vacuum exhaust inlet valve; a vacuum pump connected to the vacuum exhaust inlet valve; a pressure sensor for detecting the pressure value of the gas in the vehicle refrigerant pipeline, and the fast exhaust system switches between a first state and a second state according to the pressure value; in the first state, the air pressure value in the vehicle refrigerant pipeline is a first pressure value or a second pressure value, the vehicle refrigerant pipeline, the exhaust valve, and the outside atmosphere are connected, the vacuum exhaust outlet valve is closed, and the vacuum exhaust tank, the vacuum exhaust inlet valve, and the vacuum pump are connected; in the second state, the air pressure value in the vehicle refrigerant pipeline is a third pressure value, and the vehicle refrigerant pipeline, the vacuum exhaust outlet valve, and the vacuum exhaust tank are connected. The present invention can quickly and efficiently evacuate the gas in the vehicle refrigerant pipeline.

Description

Technical Field

[0001] The present invention relates to the field of vehicle air conditioning systems, and particularly to a rapid exhaust system and a test system. Background Art

[0002] The refrigerant filling amount of traditional fuel vehicles is in the range of 500g - 600g, and the maximum filling amount is about 800g. Such vehicles have fewer bends in the vehicle pipelines, the refrigerant filling volume is not large, and in the past, the production rhythm of automobile factories was relatively slow. Under such conditions, the traditional positive pressure test of refrigerant (testing the sealing performance of the pipeline) could fully meet the production requirements. During the positive pressure test of the refrigerant, there would be no situation of stopping the production line due to insufficient cycle time of the positive pressure test of the refrigerant, thus ensuring the production efficiency and having no adverse impact on the vehicle quality.

[0003] However, in recent years, new energy electric vehicles have shown a booming development trend. Along with this, the refrigerant filling amount of new energy vehicles has continued to increase, their pipelines have become more complex, and the number of bends has increased significantly, which has further increased the volume of the refrigerant circulation circuit. Due to the increase in the volume of the refrigerant circulation circuit and the increase in the number of pipelines, the time required for pressurizing and exhausting the system in the process of positive pressure testing has also increased significantly accordingly. In this way, under the dual pressures of a limited number of workstations and a high production rhythm, the refrigerant positive pressure test equipment designed according to the traditional design exposes serious problems. Its test cycle time is too long, resulting in frequent stops of the production line, which has a very serious impact on the production activities of customers and can no longer meet the production needs of customers. Therefore, there is an urgent need to optimize the equipment design at present, so that the gas in the vehicle refrigerant pipeline can be quickly and efficiently emptied, thereby greatly shortening the cycle time and then meeting the production needs of customers and ensuring that the vehicle quality is not affected. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the refrigerant positive pressure test equipment designed according to the traditional design requires a long exhaust time and cannot meet the production rhythm of new energy electric vehicles. The present invention provides a rapid exhaust system and a test system, which can quickly and efficiently empty the gas in the vehicle refrigerant pipeline.

[0005] To solve the above technical problems, an embodiment of the present invention discloses a rapid exhaust system, and the rapid exhaust system includes:

[0006] An exhaust valve, which is used to communicate with the external vehicle refrigerant pipeline;

[0007] A vacuum exhaust part, which includes a vacuum exhaust outlet valve, a vacuum exhaust tank, and a vacuum exhaust inlet valve that are connected in sequence;

[0008] A vacuum pump, the vacuum exhaust inlet valve is communicated with the vacuum pump;

[0009] A pressure sensor, the pressure sensor is connected to the exhaust valve and the vacuum exhaust outlet valve, the pressure sensor is used to detect the pressure value of the gas in the vehicle refrigerant pipeline in the outside world, and the fast exhaust system switches between a first state and a second state according to the pressure value, wherein;

[0010] In the first state, the air pressure value in the vehicle refrigerant pipeline in the outside world is a first pressure value or a second pressure value, the vehicle refrigerant pipeline in the outside world, the exhaust valve and the outside atmosphere are communicated in sequence, the vacuum exhaust outlet valve is closed, the vacuum exhaust tank, the vacuum exhaust inlet valve and the vacuum pump are communicated in sequence, or the vacuum exhaust inlet valve is also closed;

[0011] In the second state, the air pressure value in the vehicle refrigerant pipeline in the outside world is a third pressure value, the first pressure value is greater than the third pressure value, the third pressure value is greater than the second pressure value, the exhaust valve and the vacuum exhaust inlet valve are closed, and the vehicle refrigerant pipeline in the outside world, the vacuum exhaust outlet valve and the vacuum exhaust tank are communicated in sequence.

[0012] Adopting the above technical solution, when a positive pressure test is carried out on the vehicle refrigerant pipeline, a certain pressure of gas (such as nitrogen) will be filled into the vehicle refrigerant pipeline to test the sealing performance of the vehicle refrigerant pipeline in a high-pressure environment. At this time, the air pressure value in the vehicle refrigerant pipeline (the air pressure value refers to the pressure difference between the air pressure in the vehicle refrigerant pipeline and the ambient air pressure or the standard atmospheric pressure) is the first pressure value (such as 13 bar). After the positive pressure test is completed, it is necessary to evacuate the nitrogen in the vehicle refrigerant pipeline. At this time, the exhaust valve is opened. Since the air pressure value in the vehicle refrigerant pipeline is 13 bar at this time, which is much greater than the air pressure value of the outside atmosphere, under the action of the pressure difference, the nitrogen in the vehicle refrigerant pipeline begins to naturally discharge to the outside atmosphere through the exhaust valve. At the same time, the vacuum exhaust outlet valve is closed, and the vacuum exhaust tank, the vacuum exhaust inlet valve and the vacuum pump are communicated in sequence. The vacuum pump works to keep the vacuum exhaust tank in a vacuum state, preparing for sucking away the remaining nitrogen in the vehicle refrigerant pipeline later.

[0013] In some possible embodiments, after the vacuum exhaust tank reaches a certain vacuum degree (such as the vacuum degree is about 2 mbar or 3 mbar), the vacuum exhaust inlet valve can be closed, the vacuum pump stops working, and the vacuum degree of the vacuum exhaust tank is maintained by closing the vacuum exhaust outlet valve and the vacuum exhaust inlet valve.

[0014] As nitrogen is continuously discharged, the air pressure in the vehicle refrigerant pipeline gradually decreases. When the pressure sensor detects that the air pressure value in the vehicle refrigerant pipeline drops to the third pressure value (for example, 3 bar), the discharge speed of nitrogen significantly slows down. This is because as the air pressure decreases, the driving force for nitrogen to be discharged from the vehicle refrigerant pipeline gradually decreases, the internal and external air pressure difference becomes smaller, and the flow of nitrogen becomes less smooth.

[0015] At this time, switch the fast exhaust system to the second state, close the exhaust valve, then open the vacuum exhaust outlet valve and close the vacuum exhaust inlet valve. Since the vacuum exhaust tank is in a vacuum state and its internal air pressure is much lower than the current air pressure in the vehicle refrigerant pipeline, under the action of this huge air pressure difference, the vacuum exhaust tank acts like a powerful "suction pump" and can rely on its own vacuum environment to accelerate the suction of the remaining nitrogen in the vehicle refrigerant pipeline. This exhaust method using the vacuum principle is much more efficient than relying solely on natural exhaust.

[0016] As the vacuum exhaust tank continues to operate, the air pressure in the vehicle refrigerant pipeline will continue to drop. When the air pressure value in the vehicle refrigerant pipeline drops to the second pressure value (for example, 0.2 bar), close the vacuum exhaust outlet valve and reopen the exhaust valve, that is, the fast exhaust system is in the first state at this time. This series of operations is to further ensure that the nitrogen in the pipeline can be completely emptied until the normal atmospheric pressure.

[0017] The solution of this application greatly improves the exhaust efficiency by setting a vacuum exhaust outlet valve and a vacuum exhaust tank, and using the vacuum environment in the vacuum exhaust tank to quickly suck away the remaining gas in the vehicle refrigerant pipeline, so that the gas in the vehicle refrigerant pipeline can be quickly and efficiently emptied, saving a lot of time for the entire exhaust process.

[0018] According to another specific embodiment of the present invention, the fast exhaust system includes a vacuum sensor and a pre-vacuum valve. The vacuum sensor is connected to the pre-vacuum valve. The vacuum sensor is used to detect the vacuum degree of the gas in the vehicle refrigerant pipeline outside. The fast exhaust system switches between the third state and the fourth state according to the vacuum degree;

[0019] In the third state, the exhaust valve and the vacuum exhaust outlet valve are closed, and the vehicle refrigerant pipeline outside, the pre-vacuum valve and the vacuum pump are connected in sequence;

[0020] In the fourth state, the pre-vacuum valve and the vacuum exhaust inlet valve are closed, and the vacuum exhaust tank, the vacuum exhaust outlet valve, the exhaust valve and the outside atmosphere are connected in sequence.

[0021] With the above technical solution, after the step of exhausting the nitrogen in the vehicle refrigerant pipeline is completed, the vehicle refrigerant pipeline needs to be evacuated to a vacuum state to prepare for the subsequent refrigerant filling. During the vacuuming process, the quick exhaust system is in the third state, the exhaust valve and the vacuum exhaust inlet valve are closed, the vehicle refrigerant pipeline, the pre-vacuuming valve and the vacuum pump are connected in sequence, and the vehicle refrigerant pipeline is evacuated using the vacuum pump.

[0022] After the pre-vacuuming of the vehicle refrigerant pipeline is completed, the quick exhaust system is switched from the third state to the fourth state. Close the pre-vacuuming valve, keep the vacuum exhaust inlet valve closed, open the exhaust valve and the vacuum exhaust outlet valve, so that the vacuum exhaust tank, the vacuum exhaust outlet valve, the exhaust valve and the outside atmosphere are connected in sequence. In this way, the nitrogen stored in the vacuum exhaust tank can be discharged into the atmosphere along this connecting path. During the discharge of the nitrogen in the vacuum exhaust tank, the vehicle interface adapter is separated from the vehicle refrigerant pipeline, and the quick exhaust system moves to the next vehicle to perform positive pressure testing, pre-vacuuming and other operations on the next vehicle.

[0023] Regarding the triggering condition for the quick exhaust system to switch from the third state to the fourth state, in some possible embodiments, after the vehicle interface adapter is separated from the vehicle refrigerant pipeline, the exhaust valve and the vacuum exhaust outlet valve are triggered to open to exhaust the vacuum exhaust tank. At the same time, the quick exhaust system moves to the next vehicle to perform positive pressure testing, pre-vacuuming and other operations on the next vehicle.

[0024] This parallel operation of exhausting the vacuum exhaust tank while moving the quick exhaust system to the next vehicle reduces the time required for the entire process, improves the exhaust efficiency, and optimizes the entire exhaust process. And because the time required for the vacuum exhaust tank to exhaust nitrogen is much shorter than the time required for the quick exhaust system to move to the next vehicle, this means that the working efficiency of the entire system is further improved.

[0025] In some possible embodiments, if the exhaust of the vacuum exhaust tank has been completed during the process of moving the quick exhaust system to the next vehicle, the vacuum exhaust outlet valve can be closed, and the vacuum exhaust tank, the vacuum exhaust inlet valve and the vacuum pump can be connected in sequence, and the vacuum pump works to evacuate the vacuum exhaust tank.

[0026] According to another specific embodiment of the present invention, the rapid exhaust system further includes a vacuum protection tank disposed between the pre-vacuum valve and the vacuum pump.

[0027] By adopting the above technical solution, since there may be water or impurities in the vehicle refrigerant pipeline, when the vehicle refrigerant pipeline is evacuated, the water or impurities will enter the vacuum protection tank instead of entering the vacuum pump, thereby avoiding damage to the vacuum pump and protecting the vacuum pump.

[0028] According to another specific embodiment of the present invention, the quick exhaust system includes a pressurizing part, and the quick exhaust system can switch between the first state and the fifth state;

[0029] In the fifth state, the pressurizing part is communicated with the vehicle refrigerant pipeline outside, the exhaust valve, the vacuum exhaust outlet valve and the pre-evacuation valve are closed, and the vacuum exhaust tank, the vacuum exhaust inlet valve and the vacuum pump are communicated in sequence.

[0030] Adopting the above technical solution, before the refrigerant positive pressure test, the quick exhaust system is in the fifth state at this time, and the pressurizing part and the vehicle refrigerant pipeline are communicated in sequence, and nitrogen gas with a certain pressure (for example, 13 bar) is filled into the vehicle refrigerant pipeline to prepare for the refrigerant positive pressure test.

[0031] At the same time, the vacuum exhaust outlet valve is closed, so that the vacuum exhaust tank, the vacuum exhaust inlet valve and the vacuum pump are communicated in sequence. The vacuum pump works to keep the inside of the vacuum exhaust tank in a vacuum state to prepare for sucking away the remaining nitrogen gas in the vehicle refrigerant pipeline later. In some possible embodiments, after the vacuum exhaust tank reaches a certain vacuum degree, the vacuum exhaust inlet valve can be closed and the vacuum pump can be stopped working, and the vacuum degree of the vacuum exhaust tank can be maintained by closing the vacuum exhaust outlet valve and the vacuum exhaust inlet valve.

[0032] According to another specific embodiment of the present invention, the quick exhaust system includes a filter, and the filter is arranged between the exhaust valve, the pre-evacuation valve, the pressurizing part, the vacuum exhaust outlet valve and the vehicle refrigerant pipeline outside.

[0033] Adopting the above technical solution, there may be some impurities in the vehicle refrigerant pipeline. If the impurities are sucked into structures such as the exhaust valve and the vacuum exhaust outlet valve, it may cause damage to the structures. Therefore, a filter is arranged after the vehicle refrigerant pipeline. It can allow gas to pass through while blocking impurities outside, avoiding damage to structures such as the exhaust valve and the vacuum exhaust outlet valve caused by sucking in impurities.

[0034] According to another specific embodiment of the present invention, the quick exhaust system includes a flow rate adjustment part and a silencing filter, and the exhaust valve, the flow rate adjustment part and the silencing filter are communicated in sequence.

[0035] Adopting the above technical solution, since the sound is relatively loud when the exhaust valve discharges gas, a flow rate adjustment part is provided to adjust the flow rate of the discharged gas, that is, to adjust the decibel level of the gas discharge. At the same time, in order to further optimize the noise reduction effect, a silencing filter is provided to further reduce the decibel level of the gas discharge and reduce the impact of noise on the surrounding environment.

[0036] According to another specific embodiment of the present invention, the first pressure value is 11 bar to 13 bar, the second pressure value is 0.2 bar to 0.4 bar, and the third pressure value is 2.5 bar to 3 bar.

[0037] An embodiment of the present invention also discloses a test system, which includes:

[0038] The quick exhaust system described in any one of the foregoing;

[0039] A vehicle, the vehicle includes a vehicle refrigerant pipeline, wherein;

[0040] When the quick exhaust system is in the first state, the vehicle refrigerant pipeline is communicated with the exhaust valve;

[0041] When the quick exhaust system is in the second state, the vehicle refrigerant pipeline is communicated with the vacuum exhaust tank.

[0042] By adopting the above technical solution, the remaining gas in the vehicle refrigerant pipeline can be quickly sucked away by using the vacuum environment in the vacuum exhaust tank, greatly improving the exhaust efficiency, so that the gas in the vehicle refrigerant pipeline can be quickly and efficiently emptied, saving a large amount of time for the entire exhaust process.

[0043] An embodiment of the present invention also discloses a test system, which includes:

[0044] The quick exhaust system described above;

[0045] A vehicle, the vehicle includes a vehicle refrigerant pipeline, wherein;

[0046] When the quick exhaust system is in the third state, the vehicle refrigerant pipeline is communicated with the vacuum pump.

[0047] An embodiment of the present invention also discloses a test system, which includes:

[0048] The quick exhaust system described above;

[0049] A vehicle, the vehicle includes a vehicle refrigerant pipeline, wherein;

[0050] When the quick exhaust system is in the fifth state, the vehicle refrigerant pipeline is communicated with the pressurizing part. Description of the Drawings

[0051] Figure 1 A schematic diagram showing the quick exhaust system according to an embodiment of the present invention;

[0052] Figure 2 A schematic diagram showing the quick exhaust system according to an embodiment of the present invention in the first state;

[0053] Figure 3 Schematic diagram showing the fast exhaust system according to an embodiment of the present invention in the second state;

[0054] Figure 4 Schematic diagram showing the fast exhaust system according to an embodiment of the present invention in the third state;

[0055] Figure 5 Schematic diagram showing the fast exhaust system according to an embodiment of the present invention in the fourth state;

[0056] Figure 6 Schematic diagram showing the fast exhaust system according to an embodiment of the present invention in the fifth state.

[0057] Description of reference numerals

[0058] Fast exhaust system 100;

[0059] Exhaust valve 110;

[0060] Vacuum exhaust section 120; vacuum exhaust outlet valve 121; vacuum exhaust tank 122; vacuum exhaust inlet valve 123;

[0061] Vacuum pump 130;

[0062] Pressure sensor 140;

[0063] Pre-vacuum section 150; vacuum sensor 151; pre-vacuum valve 152; vacuum protection tank 153;

[0064] Pressurizing section 160;

[0065] Filter 170;

[0066] Flow rate adjustment section 180;

[0067] Silencing filter 190;

[0068] Vehicle interface adapter 200. Detailed implementation manners

[0069] The following specific embodiments illustrate the implementation manners of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with preferred embodiments, this does not mean that the features of this invention are limited to this implementation manner. On the contrary, the purpose of introducing the invention in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, many specific details will be included in the following description. The present invention can also be implemented without these details. In addition, in order to avoid confusing or obscuring the key points of the present invention, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0070] It should be noted that in this specification, similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0071] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0072] Terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0073] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations.

[0074] To make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below with reference to the drawings.

[0075] Reference Figure 1, an embodiment of the present application provides a test system (not shown in the figure), including a quick exhaust system 100 and a vehicle (not shown in the figure), and the vehicle includes a vehicle refrigerant pipeline (not shown in the figure). The quick exhaust system 100 is connected to the vehicle refrigerant pipeline through a vehicle interface adapter 200.

[0076] The quick exhaust system 100 includes an exhaust valve 110, a vacuum exhaust part 120, a vacuum pump 130, and a pressure sensor 140. The exhaust valve 110 is communicated with the vehicle refrigerant pipeline through the vehicle interface adapter 200. The vacuum exhaust part 120 includes a vacuum exhaust outlet valve 121, a vacuum exhaust tank 122, and a vacuum exhaust inlet valve 123 that are sequentially communicated. The vacuum exhaust outlet valve 121 is communicated with the vehicle refrigerant pipeline through the vehicle interface adapter 200, and the vacuum exhaust inlet valve 123 is communicated with the vacuum pump 130.

[0077] The pressure sensor 140 is connected to the exhaust valve 110 and the vacuum exhaust outlet valve 121, and the pressure sensor 140 is used to detect the pressure value of the gas in the vehicle refrigerant pipeline. The quick exhaust system 100 switches between a first state and a second state based on the pressure value detected by the pressure sensor 140. It should be noted that in the context of the present application, the "air pressure value" and "pressure value" refer to the pressure difference between the air pressure in the vehicle refrigerant pipeline and the ambient air pressure or the standard atmospheric pressure.

[0078] In the first state, the air pressure value in the vehicle refrigerant pipeline is the first pressure value and the second pressure value. The vehicle refrigerant pipeline, the exhaust valve 110, and the outside atmosphere are sequentially communicated. The vacuum exhaust outlet valve 121 is closed, and the vacuum exhaust tank 122, the vacuum exhaust inlet valve 123, and the vacuum pump 130 are sequentially communicated.

[0079] In the second state, the air pressure value in the vehicle refrigerant pipeline is the third pressure value. The first pressure value is greater than the third pressure value, and the third pressure value is greater than the second pressure value. The exhaust valve 110 and the vacuum exhaust inlet valve 123 are closed, and the vehicle refrigerant pipeline, the vacuum exhaust outlet valve 121, and the vacuum exhaust tank 122 are sequentially communicated.

[0080] With the above technical solution, when a positive pressure test is performed on the vehicle refrigerant pipeline, the inside of the vehicle refrigerant pipeline will be filled with a gas at a certain pressure (such as nitrogen) to test the sealing performance of the vehicle refrigerant pipeline in a high-pressure environment. At this time, the air pressure value in the vehicle refrigerant pipeline is the first pressure value (such as 13 bar). After the positive pressure test is completed, it is necessary to evacuate the nitrogen in the vehicle refrigerant pipeline. At this time, the exhaust valve 110 is opened. Since the air pressure value in the vehicle refrigerant pipeline is 13 bar at this time, which is much greater than the air pressure value of the outside atmosphere, under the action of the pressure difference, the nitrogen in the vehicle refrigerant pipeline starts to naturally discharge to the outside atmosphere through the exhaust valve 110 (the flow route of nitrogen is as Figure 2In the A area (as indicated by the dashed arrow). Meanwhile, the vacuum exhaust outlet valve 121 is closed, and the vacuum exhaust tank 122, the vacuum exhaust inlet valve 123, and the vacuum pump 130 are connected in sequence. The vacuum pump 130 operates to keep the inside of the vacuum exhaust tank 122 in a vacuum state (for example, the vacuum degree is about 2 mbar or 3 mbar, and the gas flow route is as Figure 2 shown by the dashed arrow in area B in the figure), preparing for sucking away the remaining nitrogen in the vehicle refrigerant pipeline subsequently.

[0081] It should be noted that in some possible embodiments, after the vacuum exhaust tank 122 reaches a certain vacuum degree (for example, the vacuum degree is about 2 mbar or 3 mbar), the vacuum exhaust inlet valve 123 can be closed, the operation of the vacuum pump 130 can be stopped, and the vacuum degree of the vacuum exhaust tank 122 can be maintained by closing the vacuum exhaust outlet valve 121 and the vacuum exhaust inlet valve 123.

[0082] As the nitrogen is continuously discharged, the air pressure in the vehicle refrigerant pipeline gradually decreases. When the pressure sensor 140 detects that the air pressure value in the vehicle refrigerant pipeline drops to the third pressure value (for example, it is 3 bar), the discharge speed of the nitrogen significantly slows down. This is because as the air pressure decreases, the driving force for the nitrogen to be discharged from the vehicle refrigerant pipeline gradually decreases, the internal and external air pressure difference becomes smaller, and the flow of nitrogen becomes less smooth.

[0083] At this time, the fast exhaust system 100 is switched to the second state, the exhaust valve 110 is closed, then the vacuum exhaust outlet valve 121 is opened, and the vacuum exhaust inlet valve 123 is closed. Since the inside of the vacuum exhaust tank 122 is in a vacuum state and its internal air pressure is much lower than the air pressure in the vehicle refrigerant pipeline at this time, under the action of this huge air pressure difference, the vacuum exhaust tank 122 is like a powerful "suction pump" and can rely on its own vacuum environment to accelerate the suction of the remaining nitrogen in the vehicle refrigerant pipeline (the nitrogen flow route is as Figure 3 shown by the dashed arrow in the figure). This exhaust method using the vacuum principle is much more efficient than relying solely on natural exhaust.

[0084] As the vacuum exhaust tank 122 continues to operate, the air pressure in the vehicle refrigerant pipeline will continue to drop. When the air pressure value in the vehicle refrigerant pipeline drops to the second pressure value (for example, it is 0.2 bar), the vacuum exhaust outlet valve 121 is closed, and the exhaust valve 110 is reopened, that is, the fast exhaust system 100 is in the first state at this time (the nitrogen flow route is as Figure 2 shown by the dashed arrow in area A in the figure). This series of operations is to further ensure that the nitrogen in the pipeline can be completely emptied until the normal atmospheric pressure.

[0085] In the solution of this application, by setting the vacuum exhaust outlet valve 121 and the vacuum exhaust tank 122, and utilizing the vacuum environment in the vacuum exhaust tank 122, the remaining gas in the vehicle refrigerant pipeline is quickly sucked away. Compared with the prior art where only the exhaust valve 110 is relied on to discharge nitrogen (the flow route of nitrogen in the prior art is as shown by the dashed arrow in area A in Figure 2 ), the solution of this application greatly improves the exhaust efficiency, so that the gas in the vehicle refrigerant pipeline can be quickly and efficiently emptied, saving a large amount of time for the entire exhaust process.

[0086] In some possible implementation manners, the first pressure value is 11 bar to 13 bar, the second pressure value is 0.2 bar to 0.4 bar, and the third pressure value is 2.5 bar to 3 bar.

[0087] It should be noted that the specific value of the first pressure value is not specifically limited in the embodiments of this application. For example, in other possible implementation manners, the first pressure value can also be 11 bar, 11.5 bar, 12.6 bar, 13 bar, etc. The specific value of the second pressure value is not specifically limited in the embodiments of this application. For example, in other possible implementation manners, the second pressure value can also be 0.2 bar, 0.21 bar, 0.32 bar, 0.4 bar, etc. The specific value of the third pressure value is not specifically limited in the embodiments of this application. For example, in other possible implementation manners, the third pressure value can also be 2.5 bar, 2.7 bar, 2.8 bar, 3 bar, etc.

[0088] In some possible implementation manners, referring to Figure 1 , the rapid exhaust system 100 includes a pre-evacuation part 150. The pre-evacuation part 150 includes a vacuum sensor 151 and a pre-evacuation valve 152. The pre-evacuation valve 152 is communicated with the vehicle refrigerant pipeline through the vehicle interface adapter 200, and the vacuum sensor 151 is connected to the pre-evacuation valve 152. The vacuum sensor 151 is used to detect the vacuum degree in the vehicle refrigerant pipeline. The rapid exhaust system 100 switches between the third state and the fourth state based on the vacuum degree detected by the vacuum sensor 151.

[0089] In the third state, the vehicle refrigerant pipeline, the pre-evacuation valve 152, the vacuum protection tank 153, and the vacuum pump 130 are communicated in sequence, and the exhaust valve 110 and the vacuum exhaust inlet valve 123 are closed.

[0090] In the fourth state, the pre-evacuation valve 152 and the vacuum exhaust inlet valve 123 are closed, and the vacuum exhaust tank 122, the vacuum exhaust outlet valve 121, the exhaust valve 110, and the outside atmosphere are communicated in sequence.

[0091] With the above technical solution, after the step of exhausting the nitrogen in the vehicle refrigerant pipeline is completed, the vehicle refrigerant pipeline needs to be evacuated to a vacuum state to prepare for the subsequent refrigerant filling. During the vacuuming process, the quick exhaust system 100 is in the third state, the exhaust valve 110 and the vacuum exhaust inlet valve 123 are closed, the vehicle refrigerant pipeline, the pre-vacuuming valve 152, the vacuum protection tank 153 and the vacuum pump 130 are connected in sequence, and the vehicle refrigerant pipeline is evacuated by the vacuum pump 130 (the gas flow path is as shown in FIG. 1 ). Figure 4 (indicated by the dashed arrow in the middle).

[0092] After the vehicle refrigerant pipeline is pre-evacuated, the quick exhaust system 100 is switched from the third state to the fourth state. Close the pre-evacuation valve 152, keep the vacuum exhaust inlet valve 123 closed, open the exhaust valve 110 and the vacuum exhaust outlet valve 121, so that the vacuum exhaust tank 122, the vacuum exhaust outlet valve 121, the exhaust valve 110 and the outside atmosphere are connected in sequence. In this way, the nitrogen stored in the vacuum exhaust tank 122 can be discharged into the atmosphere along this connection path (the flow route of the nitrogen is as shown in FIG. 1 ). Figure 5 During the exhaust of nitrogen in the vacuum exhaust tank 122, the vehicle interface adapter 200 is separated from the vehicle refrigerant pipeline, and the quick exhaust system 100 moves to the next vehicle to perform positive pressure testing, pre-vacuuming and other operations on the next vehicle.

[0093] It should be noted that, for the triggering condition of switching the quick exhaust system 100 from the third state to the fourth state, in some possible embodiments, after the vehicle interface adapter 200 is separated from the vehicle refrigerant pipeline, the exhaust valve 110 and the vacuum exhaust outlet valve 121 are triggered to open to exhaust the vacuum exhaust tank 122. At the same time, the quick exhaust system 100 moves to the next vehicle to perform positive pressure testing, pre-vacuuming and other operations on the next vehicle.

[0094] This parallel operation mode of exhausting the vacuum exhaust tank 122 while moving the quick exhaust system 100 to the next vehicle reduces the time required for the entire process, improves the exhaust efficiency, and optimizes the entire exhaust process. In addition, since the time required for the vacuum exhaust tank 122 to exhaust nitrogen is much shorter than the time required for the quick exhaust system 100 to move to the next vehicle, this means that the working efficiency of the entire system is further improved.

[0095] It should be noted that in some possible embodiments, if the exhaust of the vacuum exhaust tank 122 has been completed during the process of moving the quick exhaust system 100 to the next vehicle, the vacuum exhaust outlet valve 121 can be closed, and the vacuum exhaust tank 122, the vacuum exhaust inlet valve 123 and the vacuum pump 130 are connected in sequence, and the vacuum pump 130 works to evacuate the vacuum exhaust tank 122.

[0096] In some possible embodiments, the pre-evacuation section 150 includes a vacuum protection tank 153 disposed between the pre-evacuation valve 152 and the vacuum pump 130.

[0097] With the above technical solution, since there may be water or impurities in the vehicle refrigerant pipeline, when evacuating the vehicle refrigerant pipeline, the water or impurities will enter the vacuum protection tank 153 instead of the vacuum pump 130, avoiding damage to the vacuum pump 130 and playing a role in protecting the vacuum pump 130.

[0098] In some possible embodiments, referring to Figure 1 , the rapid exhaust system 100 includes a pressurizing section 160, and the rapid exhaust system 100 can switch between a first state and a fifth state.

[0099] In the fifth state, the pressurizing section 160 is connected to the external vehicle refrigerant pipeline through the vehicle interface adapter 200, the exhaust valve 110, the vacuum exhaust outlet valve 121, and the pre-evacuation valve 152 are closed, and the vacuum exhaust tank 122, the vacuum exhaust inlet valve 123, and the vacuum pump 130 are connected in sequence.

[0100] With the above technical solution, before the refrigerant positive pressure test, the rapid exhaust system 100 is in the fifth state at this time, and the pressurizing section 160 is connected to the vehicle refrigerant pipeline, and nitrogen gas at a certain pressure (for example, 13 bar) is filled into the vehicle refrigerant pipeline (the flow path of the nitrogen gas is as shown by the dotted arrow in region C in Figure 6 ) to prepare for the refrigerant positive pressure test.

[0101] At the same time, the exhaust valve 110, the vacuum exhaust outlet valve 121, and the pre-evacuation valve 152 are closed, so that the vacuum exhaust tank 122, the vacuum exhaust inlet valve 123, and the vacuum pump 130 are connected in sequence, and the vacuum pump 130 operates to keep the inside of the vacuum exhaust tank 122 in a vacuum state (the flow path of the gas is as shown by the dotted arrow in region D in Figure 6 ) to prepare for sucking away the remaining nitrogen gas in the vehicle refrigerant pipeline later. It should be noted that in some possible embodiments, after the vacuum exhaust tank 122 reaches a certain vacuum degree, the vacuum exhaust inlet valve 123 can be closed, the operation of the vacuum pump 130 can be stopped, and the vacuum degree of the vacuum exhaust tank 122 can be maintained by closing the vacuum exhaust outlet valve 121 and the vacuum exhaust inlet valve 123.

[0102] In some possible embodiments, referring to Figure 1 , the rapid exhaust system 100 includes a filter 170, and the filter 170 is disposed between the exhaust valve 110, the pre-evacuation valve 152, the pressurizing section 160, the vacuum exhaust outlet valve 121, and the vehicle interface adapter 200.

[0103] With the above technical solution, there may be some impurities in the vehicle refrigerant pipeline. If the impurities are sucked into structures such as the exhaust valve 110 and the vacuum exhaust outlet valve 121, it may cause damage to the structures. Therefore, a filter 170 is provided after the vehicle refrigerant pipeline. It can allow gas to pass through while blocking the impurities outside, avoiding damage to structures such as the exhaust valve 110 and the vacuum exhaust outlet valve 121 caused by sucking in impurities.

[0104] In some possible embodiments, the quick exhaust system 100 includes a flow rate adjustment part 180 and a silencing filter 190, and the exhaust valve 110, the flow rate adjustment part 180, and the silencing filter 190 are connected in sequence.

[0105] With the above technical solution, since the sound is relatively loud when the exhaust valve 110 discharges gas, the flow rate adjustment part 180 is provided to be able to adjust the flow rate of the discharged gas, that is, to adjust the decibel level of the gas discharge. At the same time, in order to further optimize the noise reduction effect, the silencing filter 190 is provided to further reduce the decibel level of the gas discharge and reduce the impact of noise on the surrounding environment.

[0106] Next, refer to Figures 1 to 6 to describe the working process of the quick exhaust system 100 in more detail.

[0107] First, before the positive pressure test of the refrigerant, the quick exhaust system 100 is in the fifth state at this time. The pressurizing part 160 is connected to the vehicle refrigerant pipeline through the vehicle interface adapter 200, and nitrogen gas at a certain pressure (for example, 13 bar) is filled into the vehicle refrigerant pipeline (the flow route of the nitrogen gas is as shown by the dotted arrow in area C in Figure 6 ) to prepare for the positive pressure test of the refrigerant. After the inflation is completed, the pressurizing part 160 is closed.

[0108] At the same time, the exhaust valve 110, the vacuum exhaust outlet valve 121, and the pre-evacuation valve 152 are closed, so that the vacuum exhaust tank 122, the vacuum exhaust inlet valve 123, and the vacuum pump 130 are connected in sequence. The vacuum pump 130 operates to keep the vacuum exhaust tank 122 in a vacuum state (the flow route of the gas is as shown by the dotted arrow in area D in Figure 6 ) to prepare for sucking away the remaining nitrogen gas in the vehicle refrigerant pipeline later. It should be noted that in some possible embodiments, after the vacuum exhaust tank 122 reaches a certain vacuum degree, the vacuum exhaust inlet valve 123 can be closed, the operation of the vacuum pump 130 can be stopped, and the vacuum degree of the vacuum exhaust tank 122 can be maintained by closing the vacuum exhaust outlet valve 121 and the vacuum exhaust inlet valve 123.

[0109] After completing the positive pressure test of the refrigerant, it is necessary to evacuate the nitrogen in the vehicle refrigerant pipeline, that is, to switch from the fifth state to the first state. At this time, open the exhaust valve 110. Under the action of the pressure difference, the nitrogen in the vehicle refrigerant pipeline begins to naturally discharge to the outside atmosphere through the exhaust valve 110 (the flow path of nitrogen is as shown by the dotted arrow in the A area of Figure 2 ). At the same time, the vacuum exhaust outlet valve 121 remains closed, keeping the vacuum exhaust tank 122, the vacuum exhaust inlet valve 123 and the vacuum pump 130 connected in sequence. The vacuum pump 130 works to keep the inside of the vacuum exhaust tank 122 in a vacuum state (the flow path of the gas is as shown by the dotted arrow in the B area of Figure 2 ), preparing for sucking away the remaining nitrogen in the vehicle refrigerant pipeline later. It should be noted that in some possible embodiments, after the vacuum exhaust tank 122 reaches a certain vacuum degree, the vacuum exhaust inlet valve 123 can be closed and the vacuum pump 130 can be stopped working, and the vacuum degree of the vacuum exhaust tank 122 can be maintained by closing the vacuum exhaust outlet valve 121 and the vacuum exhaust inlet valve 123.

[0110] As the nitrogen is continuously discharged, the air pressure in the vehicle refrigerant pipeline gradually decreases. When the pressure sensor 140 detects that the air pressure value in the vehicle refrigerant pipeline drops to the third pressure value (for example, 3 bar), it is necessary to switch from the first state to the second state at this time. Close the exhaust valve 110, then open the vacuum exhaust outlet valve 121, and close the vacuum exhaust inlet valve 123. Since the inside of the vacuum exhaust tank 122 is in a vacuum state and its internal air pressure is much lower than the air pressure in the vehicle refrigerant pipeline at this time, under the action of this huge pressure difference, the vacuum exhaust tank 122 is like a powerful "suction pump" and can rely on its own vacuum environment to accelerate the suction of the remaining nitrogen in the vehicle refrigerant pipeline (the flow path of nitrogen is as shown by the dotted arrow in Figure 3 ).

[0111] As the vacuum exhaust tank 122 continues to work, the air pressure in the vehicle refrigerant pipeline will continue to drop. When the air pressure value in the vehicle refrigerant pipeline drops to the second pressure value (for example, 0.2 bar), it is necessary to switch from the second state to the first state at this time. Close the vacuum exhaust outlet valve 121, reopen the exhaust valve 110, and further ensure that the nitrogen in the pipeline can be completely evacuated until the normal atmospheric pressure (the flow path of nitrogen is as shown by the dotted arrow in the A area of Figure 2 ).

[0112] After the step of exhausting the nitrogen in the vehicle refrigerant pipeline is completed, the vehicle refrigerant pipeline needs to be evacuated to a vacuum state to prepare for the subsequent refrigerant filling. That is, the quick exhaust system 100 switches from the first state to the third state, the exhaust valve 110 and the vacuum exhaust inlet valve 123 are closed, and the vehicle refrigerant pipeline, the pre-vacuum valve 152, the vacuum protection tank 153 and the vacuum pump 130 are connected in sequence to achieve the purpose of evacuating the vehicle refrigerant pipeline (the flow route of the gas is as follows Figure 4 (indicated by the dashed arrow in the middle).

[0113] After the vehicle refrigerant pipeline is evacuated, the quick exhaust system 100 is switched from the third state to the fourth state. The vacuum exhaust inlet valve 123 is closed, and the vacuum exhaust inlet valve 123 is kept closed. The exhaust valve 110 and the vacuum exhaust outlet valve 121 are opened to connect the vacuum exhaust tank 122, the vacuum exhaust outlet valve 121, the exhaust valve 110 and the outside atmosphere in sequence (the flow route of nitrogen is as follows Figure 5 In this way, the nitrogen stored in the vacuum exhaust tank 122 can be discharged into the atmosphere along this connecting path. During the discharge of the nitrogen in the vacuum exhaust tank 122, the vehicle interface adapter 200 is separated from the vehicle refrigerant pipeline, and the quick exhaust system 100 moves to the next vehicle to perform positive pressure testing, pre-vacuuming and other operations on the next vehicle.

[0114] At this time, the refrigerant positive pressure test and pre-vacuuming of a vehicle are completed, and the entire quick exhaust system 100 moves to the next vehicle to start a new refrigerant positive pressure test and a new pre-vacuuming. That is, the quick exhaust system 100 is in the fifth state at this time, and starts to charge the new vehicle with nitrogen.

[0115] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A quick exhaust system, characterized in that: The quick exhaust system comprises: An exhaust valve, the exhaust valve is used to communicate with an external vehicle refrigerant pipeline; A vacuum exhaust section, the vacuum exhaust section comprising a vacuum exhaust outlet valve, a vacuum exhaust tank and a vacuum exhaust inlet valve which are connected in sequence; A vacuum pump, wherein the vacuum exhaust inlet valve is connected to the vacuum pump; A pressure sensor, the pressure sensor is connected to the exhaust valve and the vacuum exhaust outlet valve, the pressure sensor is used to detect the pressure value of the gas in the external vehicle refrigerant pipeline, and the quick exhaust system switches between the first state and the second state according to the pressure value; Pre-vacuum valve; A vacuum sensor, the vacuum sensor is connected to the pre-vacuum valve, the vacuum sensor is used to detect the vacuum degree of the gas in the external vehicle refrigerant pipeline, and the quick exhaust system switches between the third state and the fourth state according to the vacuum degree; a pressurizing section, the quick exhaust system being switchable between the first state and a fifth state, wherein; In the first state, the air pressure value in the external vehicle refrigerant pipeline is the first pressure value or the second pressure value, the external vehicle refrigerant pipeline, the exhaust valve and the external atmosphere are connected in sequence, the vacuum exhaust outlet valve is closed, the vacuum exhaust tank, the vacuum exhaust inlet valve and the vacuum pump are connected in sequence, or the vacuum exhaust inlet valve is also closed; In the second state, the air pressure value in the external vehicle refrigerant pipeline is a third pressure value, the first pressure value is greater than the third pressure value, the third pressure value is greater than the second pressure value, the exhaust valve and the vacuum exhaust inlet valve are closed, and the external vehicle refrigerant pipeline, the vacuum exhaust outlet valve and the vacuum exhaust tank are connected in sequence; In the third state, the exhaust valve and the vacuum exhaust outlet valve are closed, and the external vehicle refrigerant pipeline, the pre-vacuum valve and the vacuum pump are connected in sequence; In the fourth state, the pre-vacuum valve and the vacuum exhaust inlet valve are closed, and the vacuum exhaust tank, the vacuum exhaust outlet valve, the exhaust valve and the outside atmosphere are connected in sequence; In the fifth state, the pressurizing part is connected to the external vehicle refrigerant pipeline, the exhaust valve, the vacuum exhaust outlet valve and the pre-vacuum valve are closed, and the vacuum exhaust tank, the vacuum exhaust inlet valve and the vacuum pump are connected in sequence.

2. The quick exhaust system according to claim 1, characterized in that: The rapid exhaust system further comprises a vacuum protection tank arranged between the pre-vacuum valve and the vacuum pump.

3. The quick exhaust system according to claim 1, characterized in that: The quick exhaust system comprises a filter, and the filter is arranged between the exhaust valve, the pre-vacuum valve, the pressurizing part, the vacuum exhaust outlet valve and the external vehicle refrigerant pipeline.

4. The quick exhaust system according to claim 1, characterized in that: The quick exhaust system comprises a flow rate adjustment part and a silencer filter, and the exhaust valve, the flow rate adjustment part and the silencer filter are connected in sequence.

5. The quick exhaust system according to claim 1, characterized in that: The first pressure value is 11 bar to 13 bar, the second pressure value is 0.2 bar to 0.4 bar, and the third pressure value is 2.5 bar to 3 bar.

6. A testing system, characterized in that: The test system comprises: The quick exhaust system according to any one of claims 1 to 5; A vehicle, the vehicle comprising a vehicle refrigerant pipeline, wherein; When the quick exhaust system is in the first state, the vehicle refrigerant pipeline is in communication with the exhaust valve; When the quick exhaust system is in the second state, the vehicle refrigerant pipeline is connected to the vacuum exhaust tank.

7. The test system according to claim 6, characterized in that: When the quick exhaust system is in the third state, the vehicle refrigerant pipeline is connected to the vacuum pump.

8. The test system according to claim 6, characterized in that: When the quick exhaust system is in the fifth state, the vehicle refrigerant pipeline is in communication with the pressurizing unit.

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