Different low pressure environment nested test device and method thereof

Abstract

This invention relates to a nested testing device and method for different low-pressure environments, comprising a low-pressure test chamber, a test container, pipes, a connecting flange, valves, and a negative pressure sensor. The test container is located inside the low-pressure test chamber, the connecting flange is mounted on the outer wall of the low-pressure test chamber, and the negative pressure sensor is mounted on the test container and connected to monitoring equipment outside the low-pressure test chamber via terminals on the connecting flange. The test container and the connecting flange are connected by pipes, and two valves are mounted on the outside of the connecting flange; one valve communicates with the low-pressure test chamber, and the other communicates with the pipe between the test container and the connecting flange, with the two valves connected to each other via pipes. This invention cleverly utilizes a vacuum system to meet the testing requirements of different atmospheric environments inside and outside the product, with a simple structure and low cost.

Description

Technical Field

[0001] This invention belongs to the field of low-pressure test application technology, and relates to a nested test device and method for different low-pressure environments. Background Technology

[0002] During operation in space, aerospace products operate in a vacuum environment with a low-pressure internal environment, requiring them to function normally under these conditions. In ground-based environmental testing, a vacuum environment is achieved by using a vacuum system, such as a mechanical pump, Roots pump, or molecular pump, to extract gas molecules from a sealed container, creating a low-pressure environment with a specific vacuum level. For applications requiring an external vacuum environment and an internal low-pressure environment, a nested arrangement of two containers and vacuum systems is used to achieve different pressure environments inside and outside the product. However, vacuum systems operating in a vacuum environment are complex and expensive. Furthermore, if the pressure inside the product falls below the required value, it cannot be replenished to raise the pressure, necessitating a restart of the entire test. Extending the container outside the low-pressure test chamber via pipes and using a separate vacuum system to extract pressure from the container further complicates the test system structure and increases costs.

[0003] Chinese patent CN211436235U, a low-pressure test chamber, and other related patents all employ a single 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 requiring a single pressure value, thermal vacuum tests, etc.

[0004] Chinese patent CN105521836A describes a low-pressure testing system that meets the requirements of the explosion decompression test specified in the GJB150.2A standard. It features two low-pressure chambers connected in series, employing a single vacuum system, various pipelines, and multiple valves to achieve different pressures in the two chambers. A burst valve is used in the middle to instantly depressurize one of the chambers through pressure balancing, thus meeting the test requirements. However, the system involves connecting two low-pressure containers, resulting in a complex structure, cumbersome installation, and high requirements for sealing. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a nested test device and method for different low-pressure environments.

[0006] The solution of the present invention is:

[0007] A nested test apparatus for different low-pressure environments includes: a low-pressure test chamber, a test container, pipes, a connecting flange, valves, and a negative pressure sensor;

[0008] The test container is mounted on a support of the low-pressure test chamber, and the adapter flange is mounted on the outer wall of the low-pressure test chamber. The negative pressure sensor is mounted on the test container to monitor the pressure inside the test container. The negative pressure sensor wire is connected to the monitoring equipment outside the low-pressure test chamber through the terminal block on the adapter flange. The test container and the adapter flange are connected by a pipe. Two valves are mounted on the outside of the adapter flange, one of which is connected to the low-pressure test chamber and the other is connected to the pipe between the test container and the adapter flange. The two valves are connected to each other by a pipe.

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

[0010] Preferably, one of the two valves is connected to the low-pressure test chamber, and the other is connected to the adapter on the transfer flange, thereby achieving communication between the test container and the transfer 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 for the nested test apparatus for different low-pressure environments includes:

[0014] When vacuuming is required, both valves are opened simultaneously. The air in the test container flows into the low-pressure test chamber through the pipes and valves. The vacuuming system of the low-pressure test chamber extracts the air in the low-pressure test chamber and the test container and discharges it into the outside atmosphere.

[0015] When the monitoring equipment outside the low-pressure test chamber detects through the negative pressure sensor that the pressure value inside the test container has reached the required value, close any valve. The vacuum system of the low-pressure test chamber will only pump out the gas from the low-pressure test chamber, and the pressure of the test container will remain unchanged.

[0016] When the monitoring equipment outside the low-pressure test chamber detects through the negative pressure sensor that the pressure inside the test container is lower than the required value, close both valves, loosen either end of the pipe between the two valves, and open the valve connected to the test container. This allows air to be pumped into the test container from the outside atmosphere until the required pressure value is reached, at which point the valve is closed.

[0017] The beneficial effects of this invention compared to the prior art are:

[0018] (1) The present invention utilizes a conventional low-pressure test chamber, places the container for installing the test piece in the low-pressure test chamber, and connects the test container, the low-pressure test chamber and the external normal pressure environment in series using pipes, valves and joints to achieve control of the internal and external pressure of the test container.

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

[0020] (3) The present invention monitors the pressure values ​​inside the container and in the low pressure test chamber by using a negative pressure sensor, and records the internal and external pressures of the product installed on the container in real time to verify the product performance. Attached Figure Description

[0021] Figure 1 This is a simplified diagram showing the connection status of the device of the present invention;

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

[0023] Figure 3 This is a schematic diagram of the pressure extraction in the low-pressure test chamber using the device of the present invention;

[0024] Figure 4 This is a schematic diagram of the container gas replenishment in the device of the present invention. Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] This invention utilizes a conventional low-pressure test chamber. The container holding the test specimen is placed within the chamber, and pipes, valves, and connectors are used to connect the test container, the low-pressure test chamber, and the external atmospheric pressure environment in series, thereby controlling the pressure inside and outside the test container. It is suitable for testing devices where products are mounted on containers, and the inside and outside of the containers are different low-pressure environments.

[0027] like Figure 1 , 2 As shown in Figures 3 and 4, this invention provides a nested test device for different low-pressure environments, comprising a low-pressure test chamber 1, a test container 2, an adapter flange 3, a negative pressure sensor 4, an adapter 5, a pipe 6, and valves 7. The test container 2 is mounted on a support of the low-pressure test chamber 1. The negative pressure sensor 4 is mounted on the test container 2 via a sealing gasket. The sensor wire is led out of the low-pressure test chamber 1 through the terminal block of the low-pressure test chamber 1 and connected to a monitoring device outside the low-pressure test chamber 1. The adapter flange 3 is mounted on the outer wall of the low-pressure test chamber 1. Two valves 7 are mounted on matching threaded holes on the outer side of the flange 3. Another pipe connects the two valves. The adapter 5 is mounted on the test container 2 and the flange 3 respectively. Finally, the pipe 5 connects the test container 2 to the flange 3 and the valves 7. Of the two valves, one communicates with the low-pressure test chamber, and the other communicates with the test container.

[0028] like Figure 2As shown, this is a schematic diagram of the pressure inside the container. Both valves 7 are open at the same time. The air in the test container 2 flows into the low-pressure test chamber 1 through the adapter 5, pipe 6 and valve 7, and then the air is discharged into the outside atmosphere through the vacuum system of the low-pressure test chamber 1.

[0029] like Figure 3 The diagram shows the pressure inside the low-pressure test chamber. When the pressure in the test container 2 reaches the required value, close any one of the valves 7 on the transfer flange 3, or close both valves simultaneously. At this time, the vacuum system of the low-pressure test chamber 1 only pumps the gas from the low-pressure test chamber 1, and the pressure in the test container 2 remains unchanged.

[0030] like Figure 4 The diagram shows a container air replenishment process. When the pressure value of the test container 2 is lower than the required value, air needs to be replenished. At this time, both valves 7 on the adapter flange 3 should be closed simultaneously. Then, remove any end of the pipe 6 outside the low-pressure test chamber 1, open the valve 7 connecting the container 2, and fill the test container 2 with external atmospheric pressure until the required test value is reached. Then close the valve 7. Once the pressure value of the low-pressure test chamber 1 reaches the required value, the test conditions are met.

[0031] The pressure inside the test chamber and container can be controlled using the above methods. This invention overcomes the technical difficulties of complex system structure and sealing caused by the cross-use of two vacuum systems. It cleverly utilizes a single vacuum system with two pressure chambers isolated from or connected to the external atmospheric environment to meet the testing requirements of different atmospheric environments inside and outside the product.

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

Claims

1. A nested test apparatus for different low-pressure environments, characterized in that, include: Low-pressure test chamber, test container, piping, adapter flange, valve and negative pressure sensor; The test container is mounted on a support of the low-pressure test chamber, and the adapter flange is mounted on the outer wall of the low-pressure test chamber. The negative pressure sensor is mounted on the test container to monitor the pressure inside the test container. The negative pressure sensor wire is connected to the monitoring equipment outside the low-pressure test chamber through the terminal block on the adapter flange. The test container and the adapter flange are connected by a pipe. Two valves are mounted on the outside of the adapter flange, one of which is connected to the low-pressure test chamber and the other is connected to the pipe between the test container and the adapter flange. The two valves are connected to each other by a pipe.

2. The nested test apparatus for different low-pressure environments according to claim 1, characterized in that, Both the test vessel and the adapter flange are equipped with adapters, and the two adapters are connected by a pipe.

3. The nested test apparatus for different low-pressure environments according to claim 2, characterized in that, Of the two valves, one is connected to the low-pressure test chamber, and the other is connected to the adapter on the transfer flange, thereby enabling communication between the test container and the transfer flange.

4. The nested test apparatus for different low-pressure environments according to claim 1, characterized in that, The low-pressure test chamber is a standard test chamber with a vacuum system.

5. The nested test apparatus for different low-pressure environments according to claim 1, characterized in that, The negative pressure sensor is mounted on the test container via a sealing gasket.

6. The test method of the nested test apparatus for different low-pressure environments as described in any one of claims 1-5, characterized in that, include: When vacuuming is required, both valves are opened simultaneously. The air in the test container flows into the low-pressure test chamber through the pipes and valves. The vacuuming system of the low-pressure test chamber extracts the air in the low-pressure test chamber and the test container and discharges it into the outside atmosphere. When the monitoring equipment outside the low-pressure test chamber detects through the negative pressure sensor that the pressure value inside the test container has reached the required value, close any valve. The vacuum system of the low-pressure test chamber will only pump out the gas from the low-pressure test chamber, and the pressure of the test container will remain unchanged. When the monitoring equipment outside the low-pressure test chamber detects through the negative pressure sensor that the pressure inside the test container is lower than the required value, close both valves, loosen either end of the pipe between the two valves, and open the valve connected to the test container. This allows air to be pumped into the test container from the outside atmosphere until the required pressure value is reached, at which point the valve is closed.

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