Nested test device and method for different low-pressure environments

Abstract

The invention relates to a nested test device and method for different low-pressure environments. The nested test device comprises a low-pressure test box, a test container, a pipeline, an adapter flange plate, a valve and a negative pressure sensor, the test container is located in the low-pressure test box, the switching flange plate is installed on the outer wall of the low-pressure test box, and the negative pressure sensor is installed on the test container and connected with monitoring equipment outside the low-pressure test box through a binding post on the switching flange plate; the test container is connected with the switching flange plate through a pipeline, the two valves are installed on the outer side of the switching flange plate, one valve is communicated with the low-pressure test box, the other valve is communicated with the pipeline between the test container and the switching flange plate, and the two valves are communicated through a pipeline. A set of vacuum-pumping system is ingeniously applied, the test requirements of different atmospheric environments inside and outside a product are met, the structure is simple, and the cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of low pressure test application, and relates to a nested test device and method for different low pressure environments. Background Art

[0002] When aerospace products are working in space, they are surrounded by a vacuum environment and have a low-pressure environment inside. The products are required to work normally under such environmental conditions. In ground environmental tests, the vacuum environment is obtained by using a vacuum pump such as a mechanical pump, a Roots pump or a molecular pump to extract gas molecules in a closed container to obtain a low-pressure environment with a certain vacuum degree. For the requirements of a vacuum environment outside and a low-pressure environment inside, two sets of containers and a vacuum pumping system are nested to obtain different pressure environments inside and outside the product. The vacuum pumping system working in a vacuum environment has a complex structure and is expensive. When the pressure inside the product is lower than the required value, it cannot be replenished with air to increase its pressure value, so the entire test has to be repeated. If the container is led out of the low-pressure test box through a pipeline and another vacuum pumping system is used to extract the pressure inside the container, the test system will be complex in structure and expensive.

[0003] China's patent CN211436235U, a low pressure test chamber, and other related patents all use a pressure chamber and a vacuum system to meet the requirements of low pressure environment testing. This type of test chamber is suitable for low pressure tests and thermal vacuum tests with single pressure value requirements.

[0004] Chinese patent CN105521836A is a low pressure test system that meets the requirements of the explosion decompression test specified in the GJB150.2A standard. Two low pressure chambers are connected in series, and a set of vacuum pumps, various pipes and multiple valves are used to achieve different pressures in the two pressure chambers. A burst valve is used in the middle to make one of the containers lose pressure instantly through pressure balance, thereby meeting the test requirements. The two low pressure containers are docked, the structure is complex, the installation is very troublesome, and the sealing requirements are high. Summary of the invention

[0005] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and to provide a nesting test device and method for different low pressure environments.

[0006] The solution of the present invention is:

[0007] A nested test device for different low pressure environments, comprising: a low pressure test box, a test container, a pipeline, a transfer flange, a valve and a negative pressure sensor;

[0008] The test container is installed on the bracket of the low-pressure test box, the adapter flange is installed on the outer wall of the low-pressure test box, and the negative pressure sensor is installed on the test container to monitor the pressure in the test container. The negative pressure sensor line is connected to the monitoring equipment outside the low-pressure test box through the terminal on the adapter flange; the test container and the adapter flange are connected by a pipeline, and two valves are installed on the outside of the adapter flange, one of which is connected to the low-pressure test box, and the other is connected to the pipeline between the test container and the adapter flange, and the two valves are connected by a pipeline.

[0009] Preferably, adapters are installed on both the test container and the adapter flange, and the two adapters are connected by a pipeline.

[0010] Preferably, one of the two valves is communicated with the low-pressure test box, and the other is communicated with the adapter on the adapter flange, thereby achieving communication with the pipeline between the test container and the adapter flange.

[0011] Preferably, the low pressure test chamber is a conventional test chamber with a vacuum system.

[0012] Preferably, the negative pressure sensor is mounted on the test container via a sealing gasket.

[0013] The test method of the nested test device in different low pressure environments comprises:

[0014] When vacuuming is required, open the two valves at the same time, and the air in the test container flows into the low-pressure test chamber through the pipe and valve. The vacuuming system of the low-pressure test chamber draws the air in the low-pressure test chamber and the test container and discharges it into the external atmospheric environment.

[0015] When the monitoring equipment outside the low pressure test chamber detects through the negative pressure sensor that the pressure value in the test container reaches the required value, any valve is closed, and the vacuum system of the low pressure test chamber only extracts the gas in the low pressure test chamber, and the pressure of the test container remains unchanged;

[0016] When the monitoring equipment outside the low pressure test box detects through the negative pressure sensor that the pressure in the test container is lower than the required value, the two valves are closed, and either end of the pipe between the two valves is loosened. The valve connected to the test container is opened, and air can be inflated into the test container through the outside atmosphere until the required pressure value is reached, and then the valve is closed.

[0017] The beneficial effects of the present invention compared with the prior art are:

[0018] (1) The present invention utilizes a conventional low-pressure test chamber, places a container in which a test piece is installed in the low-pressure test chamber, and uses pipes, valves, and joints to connect the test container, the low-pressure test chamber, and the external normal pressure environment in series to achieve control of the pressure inside and outside the test container.

[0019] (2) The present invention can obtain different pressure values ​​in two containers by using a conventional low-pressure test box, and has a simple structure and low cost.

[0020] (3) The present invention monitors the pressure values ​​in the container and the low pressure test box through the negative pressure sensor, records the internal and external pressures of the product installed on the container in real time, and verifies the product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a simplified diagram of the connection state of the device of the present invention;

[0022] Figure 2 This is a schematic diagram of the pressure inside the container extracted by the device of the present invention;

[0023] Figure 3 It is a schematic diagram of the pressure of the low pressure test box extracted by the device of the present invention;

[0024] Figure 4 It is a schematic diagram of gas replenishment in the container of the device of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] The present invention utilizes a conventional low-pressure test box, places a container for installing a test piece in the low-pressure test box, and connects the test container, the low-pressure test box and the external normal pressure environment in series through pipes, valves and joints to achieve control of the pressure inside and outside the test container. It is suitable for a test device in which a product is installed on a container and the inside and outside of the container are different low-pressure environments.

[0027] like Figure 1 , 2 As shown in Figures 3 and 4, a nested test device for different low pressure environments of the present invention comprises a low pressure test box 1, a test container 2, a transfer flange 3, a negative pressure sensor 4, a transfer joint 5, a pipe 6 and a valve 7; the test container 2 is mounted on the bracket of the low pressure test box 1, the negative pressure sensor 4 is mounted on the test container 2 through a sealing gasket, and the sensor line is led out of the low pressure test box 1 through the terminal of the low pressure test box 1, and connected to the monitoring equipment outside the low pressure test box 1. The transfer flange 3 is mounted on the outer wall of the low pressure test box 1, and two valves 7 are mounted on the matching threaded holes on the outer side of the flange 3, and another pipe is used to connect the two valves. The transfer joint 5 is mounted on the test container 2 and the flange 3 respectively, and finally the pipe 5 connects the test container 2 with the flange 3 and the valve 7. Of the two valves, one is connected to the low pressure test box, and the other is connected to the test container.

[0028] like Figure 2As shown, it is a schematic diagram of extracting the internal pressure of the container. The two valves 7 are in the open state at the same time. The air in the test container 2 flows into the low-pressure test box 1 through the adapter 5, the pipeline 6 and the valve 7, and then the air is discharged into the external atmospheric environment through the vacuum system of the low-pressure test box 1.

[0029] like Figure 3 As shown, it is a schematic diagram of extracting the internal pressure of the low-pressure test box. When the pressure of the test container 2 reaches the required value, close any valve 7 on the adapter flange 3, or close both valves at the same time. At this time, the vacuum system of the low-pressure test box 1 only extracts the gas of the low-pressure test box 1, and the pressure of the test container 2 remains unchanged.

[0030] like Figure 4 As shown in the figure, it is a schematic diagram of gas replenishment in the container. When the pressure value of the test container 2 is lower than the required value, gas replenishment is required. At this time, the two valves 7 on the adapter flange 3 need to be closed at the same time, and then any end of the pipe 6 outside the low-pressure test box 1 is removed, and the valve 7 connected to the container 2 is opened. The test container 2 is inflated by the external atmospheric pressure until the required test value is reached, and then the valve 7 is closed. After the pressure value of the low-pressure test box 1 reaches the required value, the test conditions are met.

[0031] The above method can realize the control of the pressure in the test box and the container. The present invention overcomes the technical difficulties of complex system structure and difficult sealing caused by the cross-use of two vacuum systems, and cleverly uses a set of vacuum systems to isolate or connect the two air pressure chambers with the external atmospheric environment to meet the test requirements of different atmospheric environments inside and outside the product.

[0032] The undisclosed technologies in the present invention are common knowledge to those skilled in the art.

Claims

1. A nesting test device for different low pressure environments, characterized in that: include: Low pressure test chamber, test container, pipeline, adapter flange, valve and negative pressure sensor; The test container is installed on the bracket of the low-pressure test box, the adapter flange is installed on the outer wall of the low-pressure test box, and the negative pressure sensor is installed on the test container to monitor the pressure in the test container. The negative pressure sensor line is connected to the monitoring equipment outside the low-pressure test box through the terminal on the adapter flange; the test container and the adapter flange are connected by a pipeline, and two valves are installed on the outside of the adapter flange, one is connected to the low-pressure test box, and the other is connected to the pipeline between the test container and the adapter flange, and the two valves are connected by a pipeline.

2. The nesting test device for different low pressure environments according to claim 1, characterized in that: Adapters are installed on both the test container and the adapter flange, and the two adapters are connected by pipes.

3. The nesting test device for different low pressure environments according to claim 2, characterized in that: Of the two valves, one is communicated with the low pressure test box, and the other is communicated with the adapter on the adapter flange, thereby achieving communication with the pipeline between the test container and the adapter flange.

4. The nesting test device for different low pressure environments according to claim 1, characterized in that: The low pressure test chamber is a conventional test chamber with a vacuum system.

5. The nesting test device for different low pressure environments according to claim 1, characterized in that: The negative pressure sensor is installed on the test container through a sealing gasket.

6. A test method for a nested test device in different low pressure environments according to any one of claims 1 to 5, characterized in that: include: When vacuuming is required, open the two valves at the same time, and the air in the test container flows into the low-pressure test chamber through the pipe and valve. The vacuuming system of the low-pressure test chamber draws the air in the low-pressure test chamber and the test container and discharges it into the external atmospheric environment. When the monitoring equipment outside the low pressure test chamber detects through the negative pressure sensor that the pressure value in the test container reaches the required value, any valve is closed, and the vacuum system of the low pressure test chamber only extracts the gas in the low pressure test chamber, and the pressure of the test container remains unchanged; When the monitoring equipment outside the low pressure test box detects through the negative pressure sensor that the pressure in the test container is lower than the required value, the two valves are closed, and either end of the pipe between the two valves is loosened. The valve connected to the test container is opened, and air can be inflated into the test container through the outside atmosphere until the required pressure value is reached, and then the valve is closed.

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