Differential pressure type automobile brake system leak detection equipment

Abstract

The utility model provides a differential pressure type automobile brake system leak detection device, which relates to the technical field of automobile brake system brake fluid filling, and comprises a cabinet, an electric control assembly, a control valve assembly, a liquid storage tank, a back suction separation tank, an airtight leak detector and a vacuum filling gun, and a control unit, a control cabinet air conditioner and a filling gun swing arm are arranged in the cabinet. The control valve assembly is internally provided with an air source processing element, a pneumatic control element, a polymer air drying filter and a micro-mist filter, the vacuum pump, the filling pump, the back-suction separation tank, the airtight leak detector and the precision filter are arranged to play a role in pressure difference leak detection, and the function is used for performing leak detection on a workpiece before filling; the phenomena of liquid leakage risk, influence on automobile braking, soft braking and even failure after filling are prevented, a vacuum filling function is provided for the workpiece after leakage detection is completed, and meanwhile, a differential pressure type airtight leakage detection function of equipment on the workpiece is also realized.

Description

Technical Field

[0001] The utility model relates to the technical field of filling brake fluid of automobile brake systems, in particular to a differential pressure type automobile brake system leakage detection device. Background Art

[0002] During the operation of the vehicle, brakes are required under various working conditions. In the vehicle's brake system, brake fluid plays an important role. Its brake working pressure is generally 2MPa, and can reach up to 4-5MPa. Therefore, the brake system needs to be a highly sealed, high-pressure-resistant enclosed space. The brake fluid fills the entire pipeline in this container. When under pressure, the brake fluid can quickly and evenly transmit the pressure to all places. If there is a leak in the brake system, the brakes may become soft or even fail, affecting driving safety. Before the car leaves the factory, the brake system needs to be filled with brake fluid. During the process of adding brake fluid, the brake system of the car needs to be leak-checked. Only after confirming that the sealing is qualified can it be filled. During the leak detection process, leakage below 2mbar is often detected, and existing leak detection technology is difficult to meet the requirements. Utility Model Content

[0003] The purpose of the utility model is to solve the technical problems raised in the above background technology.

[0004] The utility model adopts the following technical scheme: a pressure differential automobile brake system leak detection device, including a cabinet, an electronic control component, a control valve component, a liquid storage tank, a back-suction separation tank, an airtight leak detector and a vacuum filling gun, wherein the cabinet is provided with a control unit, a control cabinet air conditioner and a filling gun swing arm, the control valve component is provided with an air source processing element, a pneumatic control element, a polymer air drying filter and a micro-mist filter, and the detection component is provided with a gun vacuum detection valve, a charging valve, a vacuum gauge valve, a pre-charging valve, a vacuum gauge and a precision airtight leak detector.

[0005] Preferably, the fluid storage tank is connected to the fluid replenishment barrel via a fluid replenishment pipeline, a filter and a flow switch are arranged in the fluid replenishment pipeline, and a liquid level sensor is arranged in the fluid storage tank. Here, the vacuum pump sucks the brake fluid into the degassing tank and enters the fluid storage tank after degassing, filtering the brake fluid while ensuring continuous supply of refilling.

[0006] Preferably, the liquid storage tank is connected to the filling valve via a filling pump, and an overflow valve, a one-way valve, a filter, a flow meter, a pressure sensor, and a pressure gauge are provided between the filling pump and the filling valve. Here, the filling valve is connected to the gun filling valve to form a filling pipeline of the filling gun, and the overflow valve is connected to the liquid storage tank. The overflow pressures of the two overflow valves are different to form a fast and slow filling pipeline. The PLC accurately controls the filling requirements by collecting the flow meter and pressure sensor signals.

[0007] Preferably, the vacuum pump is connected to the gun end vacuum valve through a pressure-maintaining valve, and is connected to the liquid storage tank through a degassing valve. Here, when there is no filling request, the liquid storage tank can be cyclically degassed to ensure the dryness of the brake fluid. When the vacuum pump completes vacuuming or when detecting whether the vacuum line is leaking, the pressure-maintaining valve is closed, so that the pressure of the downstream, the filling gun, and the workpiece to be filled is maintained to detect whether there is leakage.

[0008] Preferably, the back-suction separation tank is connected to the liquid storage tank via the back-suction tank discharge valve, the back-suction separation tank is connected to the air source via the back-suction tank blow valve, and the air source is connected to the back-suction separation tank via the vacuum generator valve and the vacuum generator in turn. Here, the back-suction separation tank is connected to the gun back-suction valve via the back-suction valve to form a back-suction pipeline of the filling gun, and the back-suction separation tank is used to realize the back-suction of the brake fluid in the workpiece and return it to the liquid storage tank.

[0009] Preferably, the vacuum detection valve is connected to the gun vacuum valve to form a detection pipeline of the filling gun, and the airtight leak detector is connected to the detection component through the pre-filling valve to detect the workpiece connected to the filling gun. Here, the compressed air after the air source processing unit is dried by the drying filter and connected to the upstream of the gun vacuum valve through the blowing valve. The gun vacuum valve is opened and the pressure-maintaining valve is closed to purge the pipeline in the filling gun.

[0010] Preferably, the pre-filling valve is arranged in the detection component, and the compressed air after the air source processing unit is dried by the drying filter and connected to the upstream of the gun vacuum valve through the pre-filling valve. Here, after opening, the workpiece connected to the filling gun is pre-filled with air, and the workpiece is filled with a pressure slightly lower than the set value before leak detection. After the pressure is stabilized, the airtight leak detector completes the leak detection of the workpiece through the processes of pressure filling, voltage stabilization, and leak detection.

[0011] Compared with the prior art, the advantages and positive effects of the utility model are:

[0012] In the utility model, a pressure differential leak detection is achieved by arranging a vacuum pump, a filling pump, a back-suction separation tank, an airtight leak detector and a precision filter. This function detects leaks on the workpiece before filling to prevent the risk of leakage after filling, which may affect the braking of the vehicle and cause soft or even malfunctioning brakes. The leak detection is completed to provide a vacuum filling function for the workpiece, and also realize the pressure differential airtight leak detection function of the equipment on the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model provides a three-dimensional structural schematic diagram of a pressure differential automobile brake system leak detection device;

[0014] Figure 2 The utility model provides a schematic diagram of the internal structure of a pressure differential automobile brake system leak detection device;

[0015] Figure 3The utility model provides a schematic diagram of the internal structure of a pressure differential automobile brake system leak detection device;

[0016] Figure 4 The utility model provides a schematic diagram of the internal structure of a pressure differential type automobile brake system leak detection device.

[0017] Legend:

[0018] 1. Cabinet; 2. Vacuum pump; 3. Filling pump; 4. Filling gun swing arm; 5. Airtight leak detector; 6. Back-suction separation tank; 7. Vacuum filling gun; 8. Air path control element; 9. Air source processing element; 10. Booster cylinder; 11. Polymer air drying filter; 12. Micro-mist filter; 13. Control cabinet air conditioner; 14. Liquid storage tank; 15. Fine filter; 16. Overflow valve; 17. Flow sensor; 18. Pressure gauge; 19. Flow switch. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0021] Example

[0022] See also Figure 1-4The utility model provides a technical solution: a differential pressure automobile brake system leak detection device, including a cabinet 1, an electric control component, a control valve component, a liquid storage tank 14, a back suction separation tank 6, an airtight leak detector 5 and a vacuum filling gun 7, wherein the cabinet 1 is provided with a control unit, a control cabinet air conditioner 13 and a filling gun swing arm 4, the control valve component is provided with an air source processing component 9, a pneumatic control component, a polymer air drying filter 11, and a micro-mist filter 12, the detection component is provided with a gun vacuum detection valve, a charging valve, a vacuum gauge valve, a pre-charging valve, a vacuum gauge and a precision airtight leak detector 5, the liquid storage tank The tank 14 is connected to the refilling barrel through a refilling pipeline. A filter and a flow switch 19 are provided in the refilling pipeline. A liquid level sensor is provided in the liquid storage tank 14. The vacuum pump 2 sucks the brake fluid into the degassing tank and enters the liquid storage tank 14 after degassing. While filtering the brake fluid, the continuous supply of filling is ensured. The filling pump 3 is connected to the filling valve and an overflow valve 16, a one-way valve, a filter, a flow meter, a pressure sensor, and a pressure gauge 18 are provided. The filling valve is connected to the gun filling valve to form a filling pipeline of the filling gun. The overflow valve 16 is connected to the liquid storage tank 14. The overflow pressures of the two overflow valves 16 are different, forming a fast and slow filling pipeline. The PLC accurately controls the filling requirements by collecting the flow meter and pressure sensor signals.

[0023] See also Figure 1-4 The vacuum pump 2 is connected to the gun end vacuum valve through a pressure-maintaining valve, and is connected to the liquid storage tank 14 through a degassing valve. When there is no filling request, the liquid storage tank 14 can be circulated and degassed to ensure the dryness of the brake fluid. When the vacuum pump 2 completes vacuuming or detects whether the vacuum pipeline is leaking, the pressure-maintaining valve is closed so that the pressure of the downstream and the filling gun and the workpiece to be filled is maintained to detect whether there is a leak. The back-suction separation tank 6 is connected to the liquid storage tank 14 through the back-suction tank drain valve, and the back-suction separation tank 6 is connected to the air source through the back-suction tank blowing valve. The air source is connected to the back-suction separation tank 6 through the vacuum generator valve and the vacuum generator in turn. The back-suction separation tank 6 is connected to the gun back-suction valve through the back-suction valve to form a back-suction pipeline for the filling gun. The back-suction separation tank 6 is used to realize the back-suction of the brake fluid in the workpiece, and Returning to the liquid storage tank 14, the vacuum detection valve is connected to the gun vacuum valve to form a detection pipeline of the filling gun, and the airtight leak detector is connected to the detection component through the pre-filling valve to detect the workpiece connected to the filling gun. The compressed air after the air source processing unit is dried by the drying filter and connected to the upstream of the gun vacuum valve through the blowing valve. The gun vacuum valve is opened and the pressure holding valve is closed to blow the pipeline in the filling gun. The pre-filling valve is arranged in the detection component. The compressed air after the air source processing unit is dried by the drying filter and connected to the upstream of the gun vacuum valve through the pre-filling valve. After opening, the workpiece connected to the filling gun is pre-filled. Before leak detection, the workpiece is filled with a pressure slightly lower than the set value in advance. After the pressure is stabilized, the airtight leak detector completes the leak detection of the workpiece through the processes of pressure filling, voltage stabilization, and leak detection.

[0024] Working principle: The compressed air after the air source processing unit is connected to the micro-mist filter 12 and enters the booster pump and then connected to the gun clamping release valve. The compressed air is connected to the drying filter and then connected to the air blowing pressure regulating valve, pre-filling pressure regulating valve, and precision airtight leak detector 5. The pneumatic control valve group shown is a valve island module. The processed air source is connected to the valve in the system through the valve island. The opening and closing of the valve is controlled by the control unit. When there is no filling request, the storage tank 14 can be circulated and degassed to ensure the dryness of the brake fluid. The function of the pressure maintaining valve shown is to close the pressure maintaining valve when the vacuum pump 2 is completed or when the vacuum pipeline is detected for leakage, so that the downstream and the filling gun and The pressure of the workpiece to be filled is maintained to detect whether there is any leakage. The compressed air after the air source processing unit is dried by the drying filter and connected to the upstream of the gun vacuum valve through the blowing valve. The gun vacuum valve is opened and the pressure holding valve is closed to blow the pipeline in the filling gun. The structure is ingenious. Since the volume of the workpiece is usually large and the inflation speed of the precision airtight leak detector 5 is relatively slow, in order to improve the production rhythm, a pre-charging function is added to the equipment system. After it is turned on, the workpiece connected to the filling gun is pre-charged. Before leak detection, the workpiece is filled with a pressure slightly lower than the set value in advance. After stabilizing the pressure, the airtight leak detector completes the leak detection of the workpiece through the processes of pressure charging, voltage stabilization, and leak detection.

[0025] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A pressure differential automobile brake system leak detection device, comprising a cabinet (1), an electronic control component, a control valve component, a detection component, a vacuum pump, a liquid storage tank (14), a back-suction separation tank (6), an airtight leak detector (5) and a vacuum filling gun (7), characterized in that: The cabinet (1) is provided with a control unit, a control cabinet air conditioner (13) and a filling gun swing arm (4); the control valve assembly is provided with an air source processing element (9), a pneumatic control element, a polymer air drying filter (11) and a micro-mist filter (12); the detection assembly is provided with a gun vacuum detection valve, a charging valve, a vacuum gauge valve, a pre-charging valve, a vacuum gauge and a precision airtight leak detector (5).

2. The differential pressure automobile brake system leak detection device according to claim 1, characterized in that: The liquid storage tank (14) is connected to the liquid replenishment bucket via a liquid replenishment pipeline, a filter and a flow switch (19) are arranged in the liquid replenishment pipeline, and a liquid level sensor is arranged in the liquid storage tank (14).

3. The differential pressure automobile brake system leak detection device according to claim 1, characterized in that: The liquid storage tank (14) is connected to the filling valve via a filling pump (3), and an overflow valve (16), a one-way valve, a filter, a flow meter, a pressure sensor, and a pressure gauge (18) are provided between the filling pump (3) and the filling valve.

4. The differential pressure automobile brake system leak detection device according to claim 1, characterized in that: The vacuum pump (2) is connected to the gun end vacuum valve via a pressure-maintaining valve, and is connected to the liquid storage tank (14) via a degassing valve.

5. The pressure differential automobile brake system leak detection device according to claim 1, characterized in that: The back-suction separation tank (6) is connected to the liquid storage tank (14) via the back-suction tank discharge valve, the back-suction separation tank (6) is connected to the air source via the back-suction tank air blowing valve, and the air source is connected to the back-suction separation tank (6) via the vacuum generator valve and the vacuum generator in turn.

6. The pressure differential automobile brake system leak detection device according to claim 1, characterized in that: The vacuum detection valve is connected to the gun vacuum valve to form a detection pipeline of the filling gun, and the airtight leak detector (5) is connected to the detection component through the pre-filling valve to detect the workpiece connected to the filling gun.

7. The differential pressure automobile brake system leak detection device according to claim 1, characterized in that: The pre-filling valve is arranged in the detection assembly, and the compressed air after the air source processing unit is dried by the drying filter and connected to the upstream of the gun vacuum valve through the pre-filling valve.

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