Cooling liquid filling system
By combining a switching valve and a vacuum pump, the problem of low vacuum and environmental pollution in existing coolant filling systems under both dry and wet modes is solved, achieving efficient coolant filling and recycling, and making it suitable for cooling systems of mechanical equipment such as automobiles and ships.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-04-07
AI Technical Summary
Existing coolant filling systems suffer from low vacuum and low filling efficiency in both dry and wet modes, and leaks from the venting device in wet mode can pollute the environment.
The system employs a switching valve design, including a first interface, a second interface, a third interface, and a fourth interface. By controlling the switching of channels between the control interfaces, it achieves vacuuming, filling, back suction, and recovery functions. Combined with a vacuum pump and a gas-liquid separator, it can be used for both dry and wet applications. Furthermore, it optimizes the coolant utilization rate through liquid level sensors and gravity sensors.
It improves coolant utilization, reduces workload, increases filling efficiency, enables reuse and cost reduction, and adapts to the needs of different automotive industries.
Smart Images
Figure CN224091614U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of coolant filling technology, and specifically relates to a coolant filling system. Background Technology
[0002] A coolant filling system is primarily used to add coolant to the cooling systems of machinery such as automobiles and ships. Currently, coolant filling systems on the market are mainly divided into two types: dry and wet. In the automotive industry, dry filling is suitable for automobile manufacturing. For newly assembled cooling systems, a vacuum must be evacuated before filling to remove air and moisture. Wet filling, on the other hand, is suitable for the automotive repair and maintenance industry. For already used cooling systems, coolant is added directly during filling. However, both types of filling have limitations. The former requires the cooling system to be free of liquid before filling, while the latter requires bleeding the cooling system after filling. Therefore, to meet the requirements of different automotive industries, a coolant filling system that can be used for both dry and wet applications is needed.
[0003] Currently available coolant filling systems that can be used for both dry and wet applications use compressed air to create a vacuum. While they can be used for both, the vacuum level is low in dry filling mode, requiring secondary venting and affecting filling efficiency. In wet mode, if the venting device leaks, mist will be ejected at high speed, polluting the environment. Utility Model Content
[0004] The purpose of this invention is to solve the problem of the existing technology of using compressed air to create a vacuum for refueling. Although it can be used for both dry and wet refueling, the system vacuum is low in dry refueling mode, requiring secondary venting and affecting refueling efficiency. In wet mode, if the venting device leaks, mist will be ejected at high speed, polluting the environment.
[0005] To solve the above-mentioned technical problems, this utility model discloses a coolant filling system, including: a storage container, a recovery container, a filling head, a pump body, a gas-liquid separator, a vacuum pump, and a switching valve. The pump body is installed inside the recovery container. The storage container is used to store coolant. The switching valve includes a first interface, a second interface, a third interface, and a fourth interface. The channel between any two interfaces can be switched between a connected state and a disconnected state. The first interface of the switching valve is connected to the filling head, the second interface is connected to the storage container, the third interface is connected to the pump body, and the fourth interface is connected to the inlet of the recovery container. The gas-liquid separator is connected to the outlet of the recovery container and the vacuum pump, respectively.
[0006] Using the above technical solution, the coolant filling system is equipped with a switching valve, which includes a first interface, a second interface, a third interface, and a fourth interface. The channel between any two interfaces can be switched between a connected state and a disconnected state. The interfaces of the switching valve are respectively connected to the filling head, the inlet of the storage container, the inlet of the recovery container, and the pump body located inside the recovery container. The outlet of the recovery container and the vacuum pump are connected through a gas-liquid separator. The filling head of the coolant filling system is connected to the filling inlet of the cooling system that needs to be filled with coolant. Through this coolant filling system, both dry and wet applications can be achieved. By controlling the opening and closing of the channels between the various interfaces of the switching valve, four functions are realized: vacuuming, filling, back suction, and recovery. Before filling, connect the channels between the first and fourth ports of the switching valve, and completely disconnect the channels between the first and second ports, as well as the channels between the third and fourth ports. A vacuum pump can be used to evacuate the cooling system's cooling pipes. Alternatively, after evacuation, connect the channels between the first and second ports of the switching valve, and completely disconnect the channels between the first and fourth ports, as well as the channels between the second and third ports, to fill the cooling system with the stored coolant from the storage container. This allows for both dry and wet cooling. Alternatively, when the channels between the first and fourth ports of the switching valve are connected, excess coolant in the cooling system's cooling pipes, filling head, and recovery container can be drawn back into the recovery container. Furthermore, once the coolant in the recovery container reaches a certain level, connect the channels between the second and third ports of the switching valve and use a pump to recover the coolant back to the storage container. This improves the usability, reduces workload, increases filling efficiency, enhances coolant utilization, and achieves cost reduction through reuse.
[0007] According to another specific embodiment of the present invention, the coolant filling system disclosed in this embodiment uses an electronic switching valve.
[0008] Using the above technical solution, the switching valve is an electronic switching valve, which can conveniently and accurately switch the on / off state of the channel between any two interfaces.
[0009] According to another specific embodiment of the present invention, the coolant filling system disclosed in this embodiment uses a four-way valve as the switching valve.
[0010] Using the above technical solution, the switching valve is a four-way valve, which can realize four functions: vacuuming, filling, back suction, and recovery. The structure is simple and the cost is not high.
[0011] According to another specific embodiment of the present invention, the coolant filling system disclosed in this embodiment of the present invention further includes a level sensor and a level display. The level sensor is installed inside the recovery container, and the level display is installed outside the recovery container.
[0012] By adopting the above technical solution, the liquid level of the coolant inside the recovery container can be visually observed from the outside by setting a liquid level display. By setting a liquid level sensor, when the liquid level of the coolant inside the recovery container reaches the liquid level sensor, the channel between the second and third ports of the switching valve is connected, and the pump body is used to recover the coolant from the recovery container to the storage container, thus realizing the recovery function, improving the utilization rate of coolant, and achieving reuse and cost reduction.
[0013] According to another specific embodiment of the present invention, the coolant filling system disclosed in this embodiment of the present invention further includes a filter, which is installed inside the liquid storage container, and a second interface is connected to the filter so that the second interface is connected to the liquid storage container through the filter.
[0014] By adopting the above technical solution, by installing a filter inside the liquid storage container and connecting the second port of the switching valve to the liquid storage container through the filter, impurities in the coolant in the liquid storage container can be filtered out, preventing blockage of the cooling pipes of the cooling system that requires coolant filling.
[0015] According to another specific embodiment of the present invention, the coolant filling system disclosed in this embodiment of the present invention further includes a support platform with a gravity sensor, and a liquid storage container is located on the support platform.
[0016] Using the above technical solution, the liquid storage container is located on a support platform, and a gravity sensor is installed on the support platform. The actual amount of coolant added can be calculated by determining the weight of the coolant in the liquid storage container before and after filling it with the gravity sensor. The actual amount of coolant recovered can also be calculated by determining the weight of the coolant in the liquid storage container before and after recovery using the gravity sensor.
[0017] According to another specific embodiment of the present invention, the coolant filling system disclosed in this embodiment of the present invention further includes a vacuum gauge located between the inlet and outlet of the recovery container.
[0018] By using the above technical solution, a vacuum gauge can be installed between the inlet and outlet of the recycling container to visually determine the vacuum level of the coolant filling system. Changes in the vacuum level can be used to confirm whether there is a leak in the coolant filling system.
[0019] According to another specific embodiment of the present invention, the coolant filling system disclosed in this embodiment of the present invention has a filling head with a platform structure, and the filling head is made of rubber.
[0020] Using the above technical solution, the filling head has a platform structure and is made of rubber, which can be adapted to water jugs of different diameters in cooling systems that need to be filled with coolant, making it more versatile.
[0021] According to another specific embodiment of the present invention, the coolant filling system disclosed in this embodiment of the present invention has a first interface connected to the filling head via a rubber tube.
[0022] Using the above technical solution, the first interface and the filling head are connected by a rubber tube. Since the rubber tube has high flexibility, it is easier to connect the filling head to the filling port of the cooling system that needs to be filled with coolant.
[0023] According to another specific embodiment of the present invention, the coolant filling system disclosed in this embodiment of the present invention uses a wireless lithium battery vacuum pump and a positive pressure pump body.
[0024] Using the above technical solution, the vacuum pump is a wireless lithium battery vacuum pump, which does not require a 220V power supply, increasing the application scenarios and convenience; the pump body is a positive pressure pump, which makes it easier to recover excess coolant from the recovery container to the storage container.
[0025] The beneficial effects of this utility model are as follows:
[0026] This invention provides a coolant filling system, comprising: a storage container, a recovery container, a filling head, a pump body, a gas-liquid separator, a vacuum pump, and a switching valve. The pump body is installed inside the recovery container. The storage container stores coolant. The switching valve includes a first interface, a second interface, a third interface, and a fourth interface. The channel between any two interfaces can be switched between a connected state and a disconnected state. Each interface of the switching valve is connected to the inlet of the filling head, the storage container, the recovery container, and the pump body located inside the recovery container, respectively. The gas-liquid separator connects the outlet of the recovery container to the vacuum pump. The filling head of this coolant filling system is connected to the filling inlet of the cooling system that needs coolant filling. Then, by controlling the opening and closing of the channels between the various interfaces of the switching valve, four functions—vacuuming, filling, backflow, and recovery—are achieved. Specifically, before filling, the channel between the first and fourth interfaces of the switching valve is connected, and the vacuum pump is used to evacuate the cooling pipes of the cooling system. At this time, the recovery container acts as a vacuum container to store the vacuum. After vacuuming, the channel between the first and second ports of the switching valve can be connected to add the stored coolant from the storage container to the cooling system. Alternatively, when the channel between the first and fourth ports of the switching valve is connected, excess coolant in the cooling system's cooling pipes, the filling head, and the recovery container can be drawn back to the recovery container. In this case, the recovery container acts as a back-suction tank, and after back-suction, it can also be used to store the recovered coolant. Furthermore, once the coolant in the recovery container reaches a certain level, the channel between the second and third ports of the switching valve can be connected, and the pump can be used to recover the coolant back to the storage container. This coolant filling system allows for both dry and wet applications, expanding its usability, reducing workload, increasing filling efficiency, improving coolant utilization, and achieving cost reduction through reuse. Attached Figure Description
[0027] Figure 1 A schematic diagram of the coolant filling system provided in an embodiment of this utility model.
[0028] Explanation of reference numerals in the attached figures:
[0029] 100. Liquid storage container; 110. Filter; 120. Support platform; 200. Recovery container; 300. Filling head; 310. Rubber hose; 400. Pump body; 500. Gas-liquid separator; 600. Vacuum pump; 700. Switching valve; a. First interface; b. Second interface; c. Third interface; d. Fourth interface; 810. Liquid level sensor; 820. Liquid level display; 900. Vacuum gauge. Detailed Implementation
[0030] A coolant filling system is primarily used to add coolant to the cooling systems of machinery such as automobiles and ships. Currently, coolant filling systems on the market are mainly divided into two types: dry and wet. In the automotive industry, dry filling is suitable for automobile manufacturing. For newly assembled cooling systems, a vacuum must be evacuated before filling to remove air and moisture. Wet filling, on the other hand, is suitable for the automotive repair and maintenance industry. For already used cooling systems, coolant is added directly during filling. However, both types of filling have limitations. The former requires the cooling system to be free of liquid before filling, while the latter requires bleeding the cooling system after filling. Therefore, to meet the requirements of different automotive industries, a coolant filling system that can be used for both dry and wet applications is needed.
[0031] Currently available coolant filling systems that can be used for both dry and wet applications use compressed air to create a vacuum. While they can be used for both, the vacuum level is low in dry filling mode, requiring secondary venting and affecting filling efficiency. In wet mode, if the venting device leaks, mist will be ejected at high speed, polluting the environment.
[0032] To solve the above-mentioned technical problems, this utility model provides a coolant filling system, including a switching valve. The switching valve has four ports (a first port, a second port, a third port, and a fourth port). The first port is connected to the filling head, the second port is connected to a storage container for storing coolant, the third port is connected to a pump body located inside a recovery container, and the fourth port is connected to the recovery container. A vacuum pump, a gas-liquid separator, and a recovery container are connected in sequence. The filling head is connected to the filling port of the cooling system. By controlling the on / off state of the circuits of each port of the switching valve, four functions can be realized: vacuuming, back suction, filling, and recovery. It can not only be used for both dry and wet applications, but also realize the secondary recycling of coolant. During vacuuming, only the circuit between the first and second interfaces is connected, the vacuum pump operates, and the cooling system is evacuated. At this time, excess coolant in the filling pipe between the cooling system, the filling head, and the first interface can be drawn back to the recovery container. During filling, only the circuit between the first and fourth interfaces is connected, and coolant in the storage container is added to the cooling system through the filling head. During recovery, the circuit between the third and fourth interfaces is connected. When the coolant in the recovery container reaches a certain liquid level, the pump operates, and excess coolant in the recovery container can be recovered to the storage container, improving the utilization rate of coolant and achieving reuse and cost reduction.
[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.
[0034] The coolant filling system provided by this utility model, such as Figure 1As shown, the system includes: a storage container 100, a recovery container 200, a filling head 300, a pump body 400, a gas-liquid separator 500, a vacuum pump 600, and a switching valve 700. The pump body 400 is installed inside the recovery container 200, specifically at the bottom of the recovery container 200. The storage container 100 is used to store coolant. It should be noted that the filling head 300 of this coolant filling system is connected to the filling port of the cooling system that needs coolant filling, which can specifically be the inlet of the cooling system's water tank. In one embodiment of this utility model, as... Figure 1 As shown, the filling head 300 has a platform structure and is made of rubber, which can be adapted to water bottles of different diameters in cooling systems that need to be filled with coolant, making it more versatile.
[0035] The switching valve 700 includes a first interface a, a second interface b, a third interface c, and a fourth interface d. A channel exists between any two interfaces, and this channel can be switched between a connected state and a disconnected state. In one embodiment of this invention, the switching valve 700 is an electronic switching valve, which can conveniently and accurately switch the on / off state of the channels between the interfaces. The first interface a of the switching valve 700 is connected to the filling head 300. In one embodiment of this invention, as shown... Figure 1 As shown, the first interface a is connected to the filling head 300 via a rubber tube 310. Due to the high flexibility of the rubber tube 310, it facilitates easier connection between the filling head 300 and the filling port of the cooling system requiring coolant filling. The second interface b is connected to the liquid storage container 100, the third interface c is connected to the pump body 400, and the fourth interface d is connected to the inlet of the recovery container 200. The gas-liquid separator 500 is connected to the outlet of the recovery container 200 and the vacuum pump 600, respectively. The gas-liquid separator 500 is used to filter liquid from the air in the pipeline during vacuuming, protecting the vacuum pump 600.
[0036] In this embodiment, the switching valve 700 is a four-way or higher switching valve. In one embodiment of this utility model, such as... Figure 1As shown, the switching valve 700 is a four-way valve with channels between adjacent ports. For example, there is a channel between the first port a and the second port b, a channel between the second port b and the third port c, and a channel between the third port c and the fourth port d. The opening and closing of the channels between each port can be controlled according to functional needs. For example, the channels between the first port a and the second port b, and the channels between the third port c and the fourth port d can be connected, while the channels between other ports, such as the channel between the first port a and the fourth port d, and the channel between the second port b and the third port c, are completely disconnected. Alternatively, the channels between the first port a and the fourth port d, and the channels between the second port b and the third port c can be connected, while the channels between other ports, such as the channel between the first port a and the second port b, and the channel between the third port c and the fourth port d, are completely disconnected.
[0037] It should be noted that, in this embodiment, except for the connection between the first interface a and the filling head 300 via a rubber tube 310, the connecting pipes for the remaining parts are polyvinyl chloride (PVC) pipes. Each PVC pipe has a quick-connect plug at both ends, and the corresponding connection positions on the components are also provided with corresponding quick-connect plugs that match the quick-connect plugs. Through the cooperation of the quick-connect plugs and quick-connect plugs of each PVC pipe, the various components in the coolant filling system can be quickly connected to form the coolant filling system, greatly improving the system's simplicity.
[0038] Specifically, such as Figure 1 As shown, the various ports of the switching valve 700 in the coolant filling system are connected to the filling head 300, the inlet of the storage container 100, the inlet of the recovery container 200, and the pump body 400 located inside the recovery container 200, respectively. The outlet of the recovery container 200 and the vacuum pump 600 are connected through the gas-liquid separator 500. The filling head 300 of this coolant filling system is connected to the filling inlet of the cooling system requiring coolant filling. Then, according to functional requirements, the opening and closing of the channels between the various ports of the switching valve 700 can achieve four functions: vacuuming, filling, backflow, and recovery. This coolant filling system can be used for both dry and wet applications, improving usage scenarios, reducing workload, increasing filling efficiency, improving coolant utilization, and achieving cost reduction through reuse.
[0039] More specifically, before filling, the channel between the first port a and the fourth port d of the switching valve 700 is connected, while the channel between the first port a and the second port b, and the channel between the third port c and the fourth port d are completely disconnected. The vacuum pump 600 can be used to evacuate the cooling pipes of the cooling system, while the gas-liquid separator 500 filters the liquid in the pipes to protect the vacuum pump 600. After evacuation, the channel between the first port a and the second port b of the switching valve 700 is connected, while the channel between the first port a and the fourth port d, and the channel between the second port b and the third port c are completely disconnected. Since the cooling pipes of the cooling system have been evacuated, a pressure difference is formed inside and outside. The coolant stored in the storage container 100 will be automatically filled into the cooling system through the filling head 300, and no air will remain in the cooling pipes of the cooling system after the coolant is filled. Alternatively, when the channel between the first port a and the fourth port d of the switching valve 700 is connected, excess coolant in the cooling system's cooling pipes, the filling head 300, and the inlet of the recovery container 200 can be drawn back to the recovery container 200. In other words, if there is residual coolant in the cooling system, the residual coolant can also be drawn back to the recovery container 200. Alternatively, when the channel between the second port b and the third port c of the switching valve 700 is connected, and the coolant in the recovery container 200 reaches a certain liquid level, the pump body 400 can be used to recover the coolant in the recovery container 200 to the storage container 100 to improve the utilization rate of the coolant.
[0040] In one embodiment of this utility model, such as Figure 1 As shown, the coolant filling system also includes a level sensor 810 and a level display 820. The level sensor 810 is installed inside the recovery container 200, and the level display 820 is installed outside the recovery container 200.
[0041] Specifically, by setting up a level display 820, the liquid level of the coolant inside the recovery container 200 can be visually observed from the outside of the recovery container 200. When the channel between the second port b and the third port c of the switching valve 700 is connected, by setting up a level sensor 810, when the coolant inside the recovery container 200 reaches a certain level and contacts the level sensor 810, the pump body 400 will use to recover the coolant from the recovery container 200 to the storage container 100, thus realizing the recovery function, improving the utilization rate of coolant, and achieving reuse and cost reduction.
[0042] In one embodiment of this utility model, such as Figure 1As shown, the coolant filling system also includes a filter 110, which is installed inside the coolant storage container 100. The second port b is connected to the filter 110 so that the second port b is connected to the coolant storage container 100 through the filter 110. This can filter impurities in the coolant in the coolant storage container 100 and prevent blockage of the cooling pipes of the cooling system that needs to be filled with coolant.
[0043] In one embodiment of this utility model, such as Figure 1 As shown, the coolant filling system also includes a support platform 120 with a gravity sensor, and the coolant storage container 100 is located on the support platform 120.
[0044] Specifically, the liquid storage container 100 is located on the support platform 120, and the support platform 120 is equipped with a gravity sensor (not shown in the figure). The actual amount of coolant added can be calculated by determining the weight of the coolant in the liquid storage container 100 before and after filling it with the gravity sensor. The actual amount of coolant recovered can also be calculated by determining the weight of the coolant in the liquid storage container 100 before and after recovery using the gravity sensor.
[0045] In one embodiment of this utility model, such as Figure 1 As shown, the coolant filling system also includes a vacuum gauge 900, which is located between the inlet and outlet of the recovery container 200. By installing the vacuum gauge 900 on the pipeline between the inlet and outlet of the recovery container 200, the vacuum level of the coolant filling system and the cooling pipeline of the cooling system requiring coolant filling can be directly determined. Changes in the vacuum level can be used to confirm whether there are any leaks in the coolant filling system or the cooling pipeline of the cooling system.
[0046] It should be noted that, in addition to the locations mentioned above, the vacuum gauge 900 can also be located on other pipelines between the filling head 300 and the vacuum pump 600, such as on the pipeline between the switching valve 700 and the inlet of the recovery container 200, or on the pipeline between the outlet of the recovery container 200 and the gas-liquid separator 500, as long as it can measure the vacuum level of the cooling pipeline of the cooling system and the pipeline between the filling head 300 and the vacuum pump 600 in the coolant filling system.
[0047] In one specific embodiment, the vacuum pump 600 is a wireless lithium-ion vacuum pump that does not require a 220V power supply, increasing its application scenarios and convenience; the pump body 400 is a positive pressure pump, which is highly efficient and more suitable for transferring excess coolant from the recovery container 200 to the storage container 100.
[0048] This utility model provides a coolant filling system that can be used for both dry and wet applications, expanding its application scenarios. By controlling the connection and disconnection of the channels between the various interfaces of the switching valve, four functions—vacuuming, filling, backflow, and recovery—are achieved, reducing the workload of filling and improving efficiency. The filling head to the switching valve forms a single loop, and this single loop, combined with the connection and disconnection of the channels between the various interfaces of the switching valve, enables the vacuuming, backflow, and filling functions. The filling method utilizes the internal and external pressure difference, unlike existing positive pressure filling systems. Furthermore, the recovery container can perform three functions: vacuum storage, backflow, and recovery. It can efficiently and accurately perform vacuuming and filling operations in both dry and residual coolant conditions of the cooling system requiring coolant filling. By installing a pump in the recovery container, which is connected to the storage container via a switching valve, the backflowed coolant in the recovery container can be recovered for secondary filling.
[0049] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived from the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.
[0050] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0051] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.
[0052] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.
[0053] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.
Claims
1. A coolant filling system, characterized in that, include: The system includes a liquid storage container, a recovery container, a filling head, a pump body, a gas-liquid separator, a vacuum pump, and a switching valve. The pump body is installed inside the recovery container. The liquid storage container is used to store coolant. The switching valve includes a first interface, a second interface, a third interface, and a fourth interface. The channel between any two interfaces can be switched between a connected state and a disconnected state. The first port of the switching valve is connected to the filling head, the second port is connected to the liquid storage container, the third port is connected to the pump body, the fourth port is connected to the inlet of the recovery container, and the gas-liquid separator is connected to the outlet of the recovery container and the vacuum pump, respectively.
2. The coolant filling system as described in claim 1, characterized in that, The switching valve is an electronic switching valve.
3. The coolant filling system as described in claim 1, characterized in that, The switching valve is a four-way valve.
4. The coolant filling system as described in claim 1, characterized in that, The coolant filling system also includes a level sensor and a level display. The level sensor is installed inside the recovery container, and the level display is installed outside the recovery container.
5. The coolant filling system as described in claim 1, characterized in that, The coolant filling system also includes a filter installed inside the liquid storage container, and the second interface is connected to the filter so that the second interface is connected to the liquid storage container through the filter.
6. The coolant filling system as described in claim 1, characterized in that, The coolant filling system also includes a support platform with a gravity sensor, and the coolant storage container is located on the support platform.
7. The coolant filling system as described in claim 6, characterized in that, The coolant filling system also includes a vacuum gauge located between the inlet and outlet of the recovery container.
8. The coolant filling system as described in claim 1, characterized in that, The filling head has a platform structure and is made of rubber.
9. The coolant filling system as described in claim 1, characterized in that, The first interface is connected to the filling head via a rubber tube.
10. The coolant filling system according to any one of claims 1-9, characterized in that, The vacuum pump is a wireless lithium-ion vacuum pump, and the pump body is a positive pressure pump.