CN101750227A - Operational capacity test device of low-temperature pressure gloves - Google Patents

Abstract

The present invention is a low-temperature pressurized glove operating ability testing device, which includes three parts: a vacuum system, a refrigeration system and a temperature measurement system; The temperature measurement system is composed of a temperature sensor, an inspection instrument and a computer; among them, the air in the cryogenic chamber is extracted by a vacuum pump to realize the pressure difference between the inside and outside of the glove; the low temperature is realized by cooling the liquid nitrogen in the pressure Dewar bottle The low temperature environment of the pressure chamber; the temperature measurement system is used to collect, monitor and record the temperature values of each temperature measurement point in real time to ensure that the test temperature meets the technical requirements. The invention can not only meet the pressure and visual requirements of the normal temperature and pressure test device, but also provide a low temperature test environment from normal temperature to -100°C according to the test requirements, realize the low temperature and pressure two-factor environment, and test gloves under low temperature and pressure conditions. work ability test.

Description

Low temperature pressurized gloves working ability test device

(1) Technical field:

The invention relates to a test device mainly used for testing the working ability of gloves with internal and external pressure difference in a low temperature environment.

(two) background technology:

When there is a pressure difference between the inside and outside of the glove, it will have a greater impact on the working ability of the glove, especially in low temperature environments. However, there is only a normal temperature and pressure test device in the world, and there is no glove operating ability test device that can provide low temperature and pressure dual-factor operating environment. The invention can not only meet the pressure and visual requirements of the normal temperature pressurized test device, but also provide a low temperature glove operating ability test environment from normal temperature to -100 DEG C according to the test requirements.

(3) Contents of the invention:

The purpose of the present invention is to design a low-temperature pressurized glove operating ability test device, use this test device to realize different low-temperature and low-pressure environments in the low-temperature pressure chamber, and perform an operation ability test experiment on gloves in a low-temperature and pressurized environment to evaluate glove operation. Whether the ability meets the relevant standards.

The present invention is a low-temperature pressurized glove operating ability test device, as shown in Figure 1, the device is mainly divided into three parts: a vacuum system, a refrigeration system and a temperature measurement system.

The vacuum system consists of a vacuum pump and a piezoresistive vacuum gauge. The main function is to extract the air in the low-temperature pressure chamber through the vacuum pump to realize the pressure difference between the inside and outside of the glove.

The refrigeration system consists of a pressurized Dewar vessel and a cryogenic pressure chamber. The main function is to realize the low temperature environment of the low temperature pressure chamber through the liquid nitrogen in the pressure Dewar bottle.

The temperature measurement system is composed of a temperature sensor, a patrol instrument and a computer. The main function is to collect, monitor and record the temperature value of the temperature measurement point in real time to ensure that the temperature in the cryogenic pressure chamber meets the experimental requirements.

As shown in Figure 1, the vacuum system A pumps the cryogenic pressure chamber 1 through the vacuum pump 4, and monitors the pressure value in the cryogenic pressure chamber 1 through the piezoresistive vacuum gauge 5 to realize the pressure difference between the inside and outside of the glove. The pressure control accuracy of this system can reach ±1kPa.

Refrigeration system B is the core of this device to realize the low temperature environment. Open the valve of the pressure Dewar bottle 3 to make the liquid nitrogen flow into the outside of the cryogenic pressure cabin 1 bulkhead (made of stainless steel). 1 The inner temperature reaches the extremely low temperature requirement. The low-temperature pressure chamber 1 also adopts thermal insulation material 9 (such as asbestos, cotton, etc.) for thermal insulation, so that the cooling capacity of the low-temperature nitrogen is kept in the thermal insulation material 9 to avoid excessive heat loss. The temperature control of the system can be realized by adjusting the opening of the valve on the pressure Dewar vessel 3, and the temperature control accuracy in the low-temperature pressure chamber can reach ±2°C.

The temperature measurement system C measures the temperature through the temperature sensor 8, the temperature sensor 8 is connected to the inspection instrument 6, and the temperature signal can be converted into a digital signal, and the output terminal of the inspection instrument 6 is connected to the computer 7, and the temperature is developed based on the Kingview software platform. The data acquisition software displays the temperature inside the cryogenic pressure chamber 1 in real time and guides the opening of the valve.

The invention is a low-temperature pressurized glove operating ability testing device, which has the advantages of: using liquid nitrogen to cool down the low-temperature pressure chamber, and using a vacuum pump to depressurize it, and can provide a low-temperature and pressurized dual-factor glove operating ability testing environment, and then to test the glove operating ability. Evaluation test experiments were carried out for glove operating ability.

(4) Description of drawings:

Figure 1. Schematic diagram of the device for testing the working ability of the low-temperature pressurized gloves of the present invention

1. Cryogenic pressure chamber 2. Plexiglass door 3. Pressure Dewar

4. Vacuum pump 5. Piezoresistive vacuum gauge 6. Inspection instrument

7. Computer A. Vacuum system B. Refrigeration system

C. Temperature measurement system

Figure 2. Sectional view of cryogenic pressure chamber

8. Temperature sensor 9. Insulation material 10. Vacuum pump interface

11. Piezoresistive vacuum gauge connection 12. Inspection instrument interface 13. Low temperature cold air inlet

14. Low temperature cold air outlet

(5) Specific implementation methods:

The present invention is a low-temperature pressurized glove operating ability test device, as shown in Figure 1, the device is mainly divided into three parts: a vacuum system A, a refrigeration system B and a temperature measurement system C. The vacuum system A consists of a vacuum pump 4 and a piezoresistive vacuum gauge 5, and its main function is to extract the air in the cryogenic pressure chamber 1 through the vacuum pump 4 to realize the pressure difference between the inside and outside of the glove. Install the plexiglass hatch 2 with gloves fixed on the cryogenic pressure chamber 1, and seal the space between the cabin body and the plexiglass hatch 2 with a polytetrafluoroethylene sealing ring to ensure the airtightness of the cryogenic pressure chamber 1. Turn on the vacuum pump 4 to depressurize the cryogenic pressure chamber 1, observe the pressure value displayed by the piezoresistive vacuum gauge 5, and stop depressurizing by the vacuum pump 4 when the experimental requirements are met. The refrigeration system B is composed of a pressure Dewar 3 and a low-temperature pressure chamber 1, and its main function is to realize the low-temperature environment in the low-temperature pressure chamber 1 through the liquid nitrogen in the pressure Dewar 3 . Open the valve of the pressure dewar bottle 3 to spray liquid nitrogen on the outer wall of the low-temperature pressure cabin 1 through the pipeline. When the liquid nitrogen is vaporized, it will absorb a large amount of heat from the bulkhead, and the pressure cabin wall will absorb heat from the cabin, thereby Make the temperature environment in the cryogenic pressure chamber 1 reach the experimental low temperature. Then adjust the opening of the valve to stabilize the temperature in the cryogenic pressure chamber 1 at the experimental temperature. The outside of the low-temperature pressure chamber 1 also adopts thermal insulation material 9 (such as asbestos, cotton, etc.) to insulate, so that the cooling capacity of low-temperature nitrogen remains in the thermal insulation material 9 to avoid excessive heat loss, as shown in Figure 2 . In addition, when carrying out the experiment of grasping low-temperature objects with gloves, a hollow grip rod can be installed inside the low-temperature pressure chamber 1, one end of which is connected with the low-temperature cold air inlet 13, and the other end is connected with the low-temperature cold air outlet 14, which can be tested according to the experiment Cold air at the required low temperature is required to cool the grip bars. When the grip test is not carried out, the low-temperature cold air inlet 13 and the low-temperature cold air outlet 14 should be closed. The temperature measurement system C is composed of a temperature sensor 8, an inspection instrument 6 and a computer 7, and its main function is to collect, monitor and record the temperature values of the temperature measurement points in real time. The temperature signal at the temperature measurement point is transmitted to the inspection instrument 6 through the temperature sensor 8, and the temperature signal is converted into a digital signal. The output terminal of the inspection instrument 6 is connected to the computer 7, and the temperature is displayed, monitored and recorded in real time through the configuration king temperature data acquisition software The data can guide and adjust the valve opening of the pressure Dewar 3 at the same time, so as to ensure that the test temperature meets the experimental requirements.

The implementation steps of the low-temperature pressurized glove operating ability test device are as follows:

Step 1: Install the plexiglass hatch 2 with gloves fixed on the cryogenic pressure chamber 1 and ensure the airtightness of the cryogenic pressure chamber 1 .

Step 2: Open the valve of the pressure Dewar 3 to spray liquid nitrogen on the outer wall of the cryogenic pressure chamber 1 through the pipeline to start cooling it. At the same time, open the KingView temperature data acquisition software to monitor the temperature data in real time. When the temperature in the low-temperature pressure chamber 1 reaches the experimental requirements, adjust the valve opening of the pressure Dewar 3 to keep the temperature in the low-temperature pressure chamber 1. Stablize.

Step 3: Turn on the power of the vacuum pump 4 and the piezoresistive vacuum gauge 5, pump down the cryogenic pressure chamber 1, observe the pressure value displayed by the piezoresistive vacuum gauge 5, and stop pumping the vacuum pump 4 when the experimental requirements are met.

Step 4: Start the test of the working ability of the gloves under low temperature and pressure conditions.

Step 5. After the experiment is completed, close the valve of the pressure dewar vessel 3 and the power supply of the piezoresistive vacuum gauge 5, use KingView temperature data acquisition software to record the temperature data in the experiment, and turn off the power supply of the computer 7.

Claims (5)

1. an operational capacity test device of low-temperature pressure gloves comprises 3 parts: vacuum system, refrigeration system and temp measuring system; It is characterized in that: vacuum system is made up of vacuum pump and pressure drag vacuum meter, and refrigeration system is by being made up of pressure Dewar flask and low-temperature pressure cabin, and temp measuring system is made up of temperature sensor, logging and computing machine; Wherein, realize the gloves inside and outside differential pressure by air in the vacuum pump extraction low temperature chamber; By being arranged, the liquid nitrogen cooling of pressing in the Dewar flask realizes the low temperature environment in low-temperature pressure cabin; Temp measuring system is used for gathering, monitoring in real time and write down the temperature value of each point for measuring temperature, guarantees that probe temperature reaches technical requirement.Can realize in the low-temperature pressure cabin that low temperature has the dual factors of pressure environment, adversary's cover carries out low temperature work capacity test under the press strip spare.

2. operational capacity test device of low-temperature pressure gloves according to claim 1, it is characterized in that: the required low temperature environment of gloves adopts liquid nitrogen that pressure bulkhead is freezed, absorb heat in the cabin by the pressure chamber wall, environment reaches experiment low temperature in the cabin thereby make.

3. operational capacity test device of low-temperature pressure gloves according to claim 1, it is characterized in that: low-temperature pressure also adopts insulation material (as asbestos, cotton etc.) to be incubated out of my cabin, the cold of low temperature nitrogen is remained in the insulation material, avoid too much thermal loss.

4. operational capacity test device of low-temperature pressure gloves according to claim 1, it is characterized in that: low-temperature pressure cabin body is made by stainless steel, fixedly the low-temperature pressure hatch door of gloves adopts organic glass or other transparent materials, adopts the sealing of organic material (as teflon) O-ring seal between cabin body and the organic glass hatch door.

5. operational capacity test device of low-temperature pressure gloves according to claim 1 is characterized in that: can have the work capacity of pressure test request that required low temperature cold air is provided according to gloves low temperature in the low-temperature pressure cabin.

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