CN201607312U - A device for detecting the leakage performance of a gas meter motor valve - Google Patents

Abstract

The utility model discloses a device for detecting the leakage performance of a motor valve of a gas meter. Put the upper casing of the gas meter on the silicone pad, and install the gas meter pressing device on the upper end of the upper casing of the gas meter; the gas outlet of the first two-way solenoid valve is connected with the negative pressure air source connector, and the The air inlet is connected to the air outlet on the upper end of the upper casing of the gas meter through the gas meter pressing device; the air inlet of the second two-way solenoid valve is connected to the atmosphere, and the air outlet of the second two-way solenoid valve is connected to the mass flow rate all the way. The air inlet of the sensor is connected, and the other is connected with an air inlet of the three-way solenoid valve; the air outlet of the mass flow sensor is respectively connected with the other air inlet of the three-way solenoid valve and the gas storage tank, and the outlet of the three-way solenoid valve is connected with the gas storage tank. The gas port is communicated with the gas inlet at the upper end of the gas meter upper casing through the air inlet of the gas meter pressing device. The utility model has the advantages of simple structure, safety and reliability, and simple control, and can respectively detect the leakage of the gas meter upper casing and the gas meter motor valve.

Description

A device for detecting the leakage performance of a gas meter motor valve

technical field

The utility model relates to a gas leakage detection device, in particular to a device for detecting the leakage performance of a motor valve of a gas meter.

Background technique

At present, whether it is the national appraisal standard or in actual production, the gas meter performance detection is performed separately by two processes, the casing leakage detection and the motor valve leakage detection, and both detections use positive pressure. It is easy to cause deformation of the shell. The inspection of the shell is the whole machine inspection, that is, the leakage of the upper and lower shells is tested after the installation is completed. If a leak is detected, it needs to be disassembled and reassembled. This operation wastes time and affects efficiency. For the detection of the leakage of the motor valve, the positive pressure water detection device is currently used, which requires the operator to hold the positive pressure air source connector in one hand and the upper case closed by the motor valve in the other hand. After the two are connected, the upper case is immersed in water. , Observe with the naked eye whether there are bubbles coming out, and judge its leakage accordingly.

Contents of the invention

In order to overcome the shortcomings of using positive pressure machine detection, motor valve leakage detection, and water detection device, the purpose of this utility model is to provide a device for detecting the leakage performance of the gas meter motor valve, which can not only detect the leakage of the upper shell And the leakage of the motor valve, and the two processes can be carried out in sequence, and overcome the deformation caused by the positive pressure and the complicated process caused by the water inspection. After the device is completed, the casing can be tested after being put on it.

The technical scheme that the utility model adopts is:

The utility model comprises a mass flow sensor, a gas storage tank, a three-way solenoid valve, two two-way solenoid valves and a gas meter pressing device; The gas meter pressing device is installed on the gas port and the gas outlet; the gas outlet of the first two-way solenoid valve is connected with the negative pressure gas source joint, and the air inlet of the first two-way solenoid valve is connected to the gas meter pressing device through the gas meter pressing device. The air outlet at the upper end of the upper shell of the meter is connected; the air inlet of the second two-way solenoid valve is connected with the atmosphere, and the air outlet of the second two-way solenoid valve is divided into two routes, one of which is connected with the air inlet of the mass flow sensor, and the other is connected with the air inlet of the mass flow sensor. One way is connected with an air inlet of the three-way solenoid valve; the air outlet of the mass flow sensor is respectively connected with the other air inlet of the three-way electromagnetic valve and the gas storage tank, and the air outlet of the three-way electromagnetic valve is passed through the gas meter compression device The air inlet of the gas meter is communicated with the air inlet on the upper end of the upper housing of the gas meter.

The beneficial effect that the utility model has is:

The utility model has the advantages of simple structure, safety and reliability, simple control and convenient use, and can separately detect the leakage of the gas meter upper casing and the gas meter motor valve, and can also be separately and individually detected according to needs.

Description of drawings

Fig. 1 is the structural principle schematic diagram of the utility model.

Fig. 2 is a schematic diagram of specific pipeline connections in Fig. 1 .

In the figure: 1. Mass flow sensor, 2. Straight-through adapter, 3. Three-way adapter, 4. Gas storage tank, 5. Three-way solenoid valve, 6. Air inlet connector, 7. Right-angle adapter, 8. Two-way solenoid valve, 9. Negative pressure gas source, 10. Two-way solenoid valve, 11. Gas outlet connector, 12. Gas meter upper casing, 13. Gas meter motor valve, 14. Valve, 15. Silicone pad, 16 , Gas meter compression device.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Fig. 1 and Fig. 2, the utility model comprises a mass flow sensor 1, a gas storage tank 4, a three-way solenoid valve 5, two two-way solenoid valves 8, 10 and a gas meter pressing device 16; The body 12 lower end is placed on the silica gel pad 15, and the gas meter pressing device 16 is installed on the air inlet and the gas outlet of the gas meter upper housing 12 upper ends. The gas outlet of the first two-way solenoid valve 8 communicates with the negative pressure gas source joint 9, and the air inlet of the first two-way solenoid valve 8 connects with the gas meter upper casing through the gas outlet joint 11 and the gas meter pressing device 16. The gas outlet on the upper end of 12 is connected; the gas inlet of the second two-way solenoid valve 10 is connected to the atmosphere, and the gas outlet of the second two-way solenoid valve 10 is divided into two paths through the three-way adapter, and one path is connected to the mass flow sensor 1. The air port is connected, and the other is connected with an air inlet of the three-way solenoid valve 5 through the right-angle adapter 7; An air inlet is connected to the gas storage tank 4, and the air outlet of the three-way solenoid valve 5 is communicated with the air inlet on the upper end of the upper housing 12 of the gas meter through the air inlet joint 6 and the air inlet of the gas meter pressing device 16, The two two-way solenoid valves 8, 10 and the three-way solenoid valve 5 control the on-off of the solenoid valves through a single-chip microcomputer respectively.

In the schematic diagram shown in FIG. 1 , the preparatory work before starting the detection is that the gas meter upper casing 12 is placed on the silica gel pad 15 , and the gas meter pressing device 16 compresses the gas meter upper casing 12 . The gas meter upper casing 12 leak detection starts, and the valve 14 of the gas meter motor valve 13 is in an open state at this time. The detection process goes through three stages: the first is the air extraction stage, the first two-way solenoid valve 8 is opened, and the second The two two-way electromagnetic valves 10 are closed, the three-way electromagnetic valve 5 is left closed and the right is opened, and the negative pressure gas source 9 starts to pump air, and the gas meter upper casing 12 and the gas storage tank 4 are evacuated; the second stage is the automatic Balance, the first two-way solenoid valve 8 is closed, the negative pressure gas source 9 is disconnected, the second two-way solenoid valve 10 is closed, the three-way solenoid valve 5 is left open and right closed, and the mass flow sensor 1 starts working to collect data. If There is leakage in the upper casing 12, the gas flows from the upper casing 12 through the left end of the three-way solenoid valve 5, passes through the mass flow sensor 1, and reaches the gas storage tank 4, and the mass flow sensor 1 outputs the leakage data; the third stage is the recovery stage, the system Return to the original state.

Gas meter motor valve 13 leak detection, the valve 14 of the gas meter motor valve 13 is closed, the first two-way solenoid valve 8 is opened, the second two-way solenoid valve 10 is opened, the three-way solenoid valve 5 is left closed and right opened, and the right The space between the motor valve 13 of the gas meter and the upper casing 12 is pumped, and the mass flow sensor 1 operates to collect data at the same time. If there is data output, it means that the motor valve 13 of the gas meter is leaking.

During the test process, the gas source in the system is negative pressure, and the gas storage tank 4 is required to be a rigid body capable of withstanding a vacuum state to ensure the safety of the test.

Claims (1)

1. A device for detecting the leakage performance of a gas meter motor valve, characterized in that it comprises a mass flow sensor (1), a gas storage tank (4), a three-way solenoid valve (5), two two-way solenoid valves (8, 10) and the gas meter pressing device (16); put the lower end of the gas meter upper casing (12) on the silica gel pad (15), and install the gas meter on the air inlet and the gas outlet of the upper end of the gas meter upper casing (12) Compression device (16); the air outlet of the first two-way solenoid valve (8) is connected with the negative pressure air source connector (9), and the air inlet of the first two-way solenoid valve (8) is compressed by the gas meter The device (16) communicates with the air outlet on the upper end of the gas meter upper casing (12); the air inlet of the second two-way solenoid valve (10) communicates with the atmosphere, and the air outlet of the second two-way solenoid valve (10) Divided into two paths, one path communicates with the air inlet of the mass flow sensor (1), and the other path communicates with an air inlet of the three-way solenoid valve (5); the gas outlet of the mass flow sensor (1) is respectively connected with the three-way solenoid valve ( The other air inlet of 5) is connected to the gas storage tank (4), and the air outlet of the three-way solenoid valve (5) is connected to the upper end of the upper housing (12) of the gas meter through the air inlet of the gas meter pressing device (16). The air inlet is connected.

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