Pressure switch air tightness test system

Abstract

A pressure switch air tightness test system of the utility model comprises an air supply system arranged on a bottom plate and a plurality of sealed air tanks respectively communicated with the air supply system, the sealed air tanks are respectively provided with air inlet pipes communicated with inner cavities of the sealed air tanks, and the air inlet pipes of the sealed air tanks are communicated with the air supply system through air pipes. A first manual valve is arranged on the air inlet pipe, a first pressure gauge is arranged on the sealing air tank, and a fixing connector communicated with an inner cavity of the sealing air tank is arranged on the sealing air tank. The pressure switch air tightness test system is simple and practical in structure, can realize air tightness detection of a plurality of pressure switches at one time, detects out unqualified products, ensures the quality of the pressure switches, and further ensures the reliability and stability of products.

Description

Technical Field

[0001] The utility model belongs to the technical field related to pressure switches, and in particular relates to an air tightness testing system for a pressure switch. Background Art

[0002] A pressure switch is a simple pressure control device. As the name implies, it uses pressure difference to control a mechanical switch to facilitate people's use of the machine. Its general principle is: when the pressure in the system is higher or lower than the rated safety pressure, the disc in the sensor moves instantly, and the switch connector is pushed on or off through the connecting guide rod. When the pressure drops or rises to the rated recovery value, the disc resets instantly and the switch automatically resets. Due to its simple principle and easy operation, pressure switches are widely used in various fields such as household, petroleum, and electricity. At present, after the pressure switch is manufactured, it is necessary to test the sealing performance of the pressure switch to ensure its reliability and stability in actual industrial applications. Summary of the invention

[0003] The utility model provides a pressure switch air tightness testing system, which is used for detecting the air tightness of the finished pressure switch.

[0004] The technical solution adopted by the utility model is:

[0005] A pressure switch air tightness test system includes an air supply system arranged on a base plate and a plurality of sealed air tanks respectively connected to the air supply systems, the sealed air tanks are respectively provided with air inlet pipes connected to their inner cavities, the air inlet pipes of the sealed air tanks are connected to the air supply system through air pipes, the air inlet pipes are provided with a first manual valve, the sealed air tanks are provided with a first pressure gauge, and the sealed air tanks are provided with a fixed joint connected to their inner cavities.

[0006] Preferably, the air supply system includes a pressure reducing valve, a throttle valve, a solenoid valve and a second pressure gauge arranged on the bottom plate, the inlet of the pressure reducing valve is connected to the external air source, the outlet of the pressure reducing valve is connected to the inlet of the throttle valve through an air pipe, the outlet of the throttle valve is connected to the inlet of the solenoid valve through an air pipe, the solenoid valve is electrically connected to the power switch, the outlet of the solenoid valve is divided into two paths through a three-way valve, one path is connected to the second pressure gauge, and the other path is divided into several air paths corresponding to the sealed gas tanks, and each of the air paths is respectively connected to the air inlet pipe of a sealed gas tank.

[0007] Preferably, each gas path connected to the sealed gas tank air inlet pipe is provided with a second manual valve, a deflation pipe is connected between the second manual valve and the sealed gas tank air inlet pipe, and a manual pressure relief valve is arranged on the deflation pipe.

[0008] Preferably, it further comprises a supporting upright plate, on which a plurality of arc-shaped grooves for accommodating fixed joints are provided at intervals, and the fixed joints of the sealed gas tank are arranged in the arc-shaped grooves.

[0009] Preferably, the fixed joint is an L-shaped elbow joint, and one end of the fixed joint connected to the sealed tank body is a horizontal tube with external threads, and the end away from the sealed tank body is a vertical tube with internal threads.

[0010] Compared with the prior art, the beneficial effect of the utility model is that the pressure switch air tightness testing system is simple in structure and practical, and can realize air tightness detection of multiple pressure switches at one time, detect unqualified products, ensure the quality of pressure switches, and further ensure the reliability and stability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0012] Figure 2 It is a structural schematic diagram of another embodiment of the utility model.

[0013] In the figure: 1. pressure reducing valve; 2. throttle valve; 3. solenoid valve; 4. second pressure gauge; 5. power switch; 6. gas circuit; 7. sealed gas tank; 8. air inlet pipe; 9. first manual valve; 10. first pressure gauge; 11. fixed joint; 12. second manual valve; 13. air release pipe; 14. manual pressure relief valve; 15. supporting plate; 16. arc-shaped groove; 17. handle. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described below in combination with specific implementation methods. The drawings are only used for exemplary descriptions, and only show schematic diagrams rather than physical drawings, and cannot be understood as limitations of this patent; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0015] The utility model uses gas as a medium to perform air tightness detection on a product. The pressure value of the pressure switch when working is known, the pressure switch to be tested is connected to a sealed gas tank, and the inner cavity of the sealed gas tank is inflated to the working pressure value through the gas supply system, and then the inflation circuit is cut off to ensure a constant air pressure inside the sealed gas tank, and after the air pressure is stable, the current pressure value is recorded through a pressure gauge. Then, after a period of time, which is determined according to the standard test time of the product, the pressure value of the inner cavity of the sealed gas tank is recorded. Observe whether there is a significant change between the two pressure values ​​before and after to determine whether the product has leakage.

[0016] There are three situations that occur during the testing process. When the gas supply is cut off, the pressure value of the sealed gas tank decreases significantly and continuously, which means that the product has a large leakage and is judged to be unqualified. After cutting off the gas supply and testing for a period of time, compare the two pressure values ​​before and after. If the pressure difference before and after exceeds the allowable leakage value, it means that the product has a leak and is unqualified. If the pressure difference before and after is within the standard range, the product has no leakage and is qualified.

[0017] The utility model provides a pressure switch air tightness test system, including an air supply system arranged on a bottom plate, and a plurality of sealed air tanks 7 respectively connected with the air supply systems. In the present embodiment, three sealed air tanks are arranged, and the sealed air tanks 7 are respectively provided with air inlet pipes 8 connected with their inner cavities, and the air inlet pipes 8 of the sealed air tanks 7 are connected with the air supply system through air pipes, and the air inlet pipes 8 are provided with a first manual valve 9, and the sealed air tanks 7 are provided with a first pressure gauge 10, and the sealed air tanks 7 are provided with a fixed joint 11 connected with their inner cavities.

[0018] When in use, set a pressure switch on the fixed joints of the three sealed gas tanks, and ensure that the two are sealed and connected. The gas supply system injects a certain pressure of gas into the sealed gas tank through the air inlet pipe. The pressure can be observed through the first pressure gauge, and then the gas supply source is cut off through the first manual valve. Observe whether the pressure gauge value changes. If there is no change, it means that there is no major leakage in the product. Record the pressure value at this time. After testing for a period of time, compare the pressure difference before and after to determine whether the product is qualified. Of course, according to the precision of the test, you can also select a fixed joint of a sealed gas tank to block it and use it as a blank control group. The fixed joints of the other two sealed gas tanks can be set with pressure switches. After testing for a period of time, you can observe whether there is a difference in pressure before and after the blank control group. If necessary, you can subtract the pressure difference.

[0019] Although there are many forms and types of pressure switches, their liquid connection ports and gas connection ports are all externally threaded and installed vertically on the pipeline. Therefore, in this embodiment, the fixed joint is designed as an L-shaped elbow joint or an inverted T-shaped joint, and the end of the fixed joint connected to the sealed tank body is a horizontal pipe with external threads, and the end away from the sealed tank body is a vertical pipe with internal threads. When in use, the port of the pressure switch is wrapped with raw tape and threadedly connected to the fixed joint.

[0020] In this embodiment, the air supply system includes a pressure reducing valve 1, a throttle valve 2, a solenoid valve 3, and a second pressure gauge 4 arranged on the bottom plate, the inlet of the pressure reducing valve 1 is connected to the external air source, and the outlet thereof is connected to the inlet of the throttle valve 2 through an air pipe, the outlet of the throttle valve 2 is connected to the inlet of the solenoid valve 3 through an air pipe, the solenoid valve 3 is electrically connected to a power switch 5, and the outlet of the solenoid valve 3 is divided into two paths through a three-way connection, one path is connected to the second pressure gauge 4, and the pressure value of the air supply system can be directly observed through the second pressure gauge, and the other path is divided into a plurality of air paths 6 corresponding to the sealed gas tanks, and each of the air paths 6 is respectively connected to the air inlet pipe of a sealed gas tank.

[0021] The pressure reducing valve reduces the incoming gas pressure to a certain required outlet pressure, and automatically keeps the outlet pressure stable before outputting; the throttle valve is a valve that controls the fluid flow by changing the throttling section or throttling length, and further adjusts the outlet pressure and outputs. The solenoid valve is connected to the power switch, and the power switch is connected to the external power supply to control the circuit of the solenoid valve, and then control whether the entire gas supply system is turned on. The gas source enters the sealed gas tank through the pressure reducing valve, throttle valve, and solenoid valve. When the pressure value in the sealed gas tank reaches the required pressure, the gas supply circuit is cut off through the manual valve on the air inlet pipe of the sealed gas tank, and then the power switch is turned off.

[0022] Since multiple sealed gas tanks are provided for testing, the testing time of different sealed gas tanks may be different. In order to ensure the independent operation of each sealed gas tank, a second manual valve 12 is provided on each gas path 6 connected with the sealed gas tank air inlet pipe, and a vent pipe 13 is connected between the second manual valve 12 and the sealed gas tank air inlet pipe, and a manual pressure relief valve 14 is arranged on the vent pipe 13. When the pressure switch corresponding to a sealed gas tank is tested, the second manual valve of the gas path can be closed, and the first manual valve and the manual pressure relief valve can be opened to discharge the gas in the sealed gas tank. After the pressure relief is completed, the pressure switch on the fixed joint is removed, and another pressure switch is replaced and connected, and only the path is ventilated to carry out the next set of tests.

[0023] In addition, since different types of pressure switches have different sizes, and the fixed joint currently only relies on the support of the sealed gas tank itself, in order to ensure the stability of the fixed joint, it also includes a support plate 15, and the support plate 15 is provided with a plurality of arc-shaped grooves 16 for placing the fixed joint at intervals, and the fixed joint of the sealed gas tank is arranged in the arc-shaped groove 16.

[0024] In addition, a handle 17 is provided on the side wall of the sealed gas tank to facilitate lifting and transfer.

Claims

1. A pressure switch air tightness test system, characterized in that: It includes an air supply system arranged on a bottom plate and several sealed air tanks respectively connected to the air supply systems, each of the sealed air tanks is respectively provided with an air inlet pipe connected to its inner cavity, the air inlet pipe of the sealed air tank is connected to the air supply system through an air pipe, the air inlet pipe is provided with a first manual valve, the sealed air tank is provided with a first pressure gauge, and the sealed air tank is provided with a fixed joint connected to its inner cavity.

2. The pressure switch air tightness test system according to claim 1, characterized in that: The air supply system includes a pressure reducing valve, a throttle valve, a solenoid valve, and a second pressure gauge arranged on the bottom plate. The inlet of the pressure reducing valve is connected to an external air source, and the outlet thereof is connected to the inlet of the throttle valve through an air pipe. The outlet of the throttle valve is connected to the inlet of the solenoid valve through an air pipe. The solenoid valve is electrically connected to a power switch. The outlet of the solenoid valve is divided into two paths through a three-way valve, one path is connected to the second pressure gauge, and the other path is divided into several air paths corresponding to the sealed gas tanks, and each of the air paths is respectively connected to the air inlet pipe of a sealed gas tank.

3. The pressure switch air tightness test system according to claim 2, characterized in that: A second manual valve is provided on each of the gas paths connected to the air inlet pipe of the sealed gas tank, an air release pipe is connected between the second manual valve and the air inlet pipe of the sealed gas tank, and a manual pressure relief valve is arranged on the air release pipe.

4. The pressure switch air tightness testing system according to claim 1, characterized in that: It also includes a supporting vertical plate, on which a plurality of arc-shaped grooves for accommodating fixed joints are arranged at intervals, and the fixed joints of the sealed gas tank are arranged in the arc-shaped grooves.

5. The pressure switch air tightness test system according to claim 1 or 4, characterized in that: The fixed joint is an L-shaped elbow pipe joint, one end of the fixed joint connected to the sealed tank body is a horizontal pipe with external threads, and the end away from the sealed tank body is a vertical pipe with internal threads.

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