阅读说明：本技术 一种用于高空点火试验的真空抽气系统及其方法 (Vacuum air pumping system and method for high-altitude ignition test ) 是由 白冰 韩潇 詹海洋 顾志飞 龚洁 何超 王学章 李高 王宇 于 2021-09-08 设计创作，主要内容包括：本发明公开了一种用于高空点火试验的真空抽气系统,包括通过阀门与试验舱相连接的系统本体,所述系统本体由沿试验产生的燃气输出方向依次设有的冷阱、过滤器、真空泵组和尾气处理装置组成。本申请中,冷阱可以凝结燃气中可凝成分,并对燃气降温,过滤器可以滤除燃气中固体颗粒,剩余气态燃气通过真空泵组抽除,并经尾气处理装置处理到满足环保要求,相比现有技术中的抽气装置,能保证试验过程真空度,且可耐受高空点火试验所产生的燃气。(The invention discloses a vacuum air pumping system for a high-altitude ignition test, which comprises a system body connected with a test chamber through a valve, wherein the system body consists of a cold trap, a filter, a vacuum pump set and a tail gas treatment device which are sequentially arranged along the output direction of fuel gas generated by the test. In this application, the cold trap can condense the condensable composition in the gas to the gas cooling, solid particle in the filter can the filtering gas, and remaining gaseous state gas passes through the vacuum pump package and takes out, and handles to satisfying the environmental protection requirement through tail gas processing apparatus, compares the air exhaust device among the prior art, can guarantee test process vacuum, and can tolerate the produced gas of high altitude ignition test.)

1. The vacuum air pumping system for the high-altitude ignition test is characterized by comprising a system body (1) connected with a test chamber through a valve (2), wherein the system body (1) consists of a cold trap (101), a filter (102), a vacuum pump set (103) and a tail gas treatment device (104) which are sequentially arranged along the output direction of fuel gas generated by the test.

2. The vacuum air exhaust system for the high altitude ignition test is characterized in that the cooling medium of the cold trap (101) is cooling water or liquid nitrogen.

3. A vacuum pumping system for high altitude ignition tests according to claim 2, characterized in that the vacuum pump group (103) is a mechanical vacuum pump.

4. A vacuum pumping system for high altitude ignition test according to claim 3, characterized in that the tail gas processing device (104) is a mass transfer apparatus using solution adsorption.

5. A vacuum air extraction method for a high-altitude ignition test is characterized by comprising the following steps:

a. introducing gas generated by the test chamber into the cold trap (101), and condensing condensable gas in the gas on the inner surface of the cold trap (101);

b. introducing the fuel gas treated by the cold trap (101) into a filter (102), and filtering particles by the filter (102);

c. discharging the fuel gas treated by the filter (102) into an exhaust gas treatment device (104) through a vacuum pump set (103);

d. the tail gas treatment device (104) treats the fuel gas and discharges the fuel gas to the outside.

Technical Field

The invention relates to the technical field of environmental tests, in particular to a vacuum air pumping system and a vacuum air pumping method for a high-altitude ignition test.

Background

With the development of the aeronautical field, and in particular the development of the near space technology, the number of devices required to perform ignition at high altitude is increasing. The air in the high-altitude environment is thin, and in order to ensure that the high-altitude ignition equipment can normally complete target work, the high-altitude ignition equipment needs to be fully tested before application. The gas generated by ignition has the characteristics of strong corrosion, condensation, smoke particles, strong pollution, flammability, explosiveness and the like, and provides a very high challenge for the safety of a vacuum pumping system. The existing mechanical vacuum pump can not adapt to the harsh use conditions, the injection vacuum pump can adapt to the conditions of particles and the like, but explosion prevention and harmless treatment of tail gas can not be ensured, and the cost for ensuring the ultimate vacuum degree lower than 1Pa is very high.

Therefore, the vacuum pumping system provided by the invention can tolerate fuel gas, treat tail gas and ensure the vacuum degree of the test system during ignition.

Disclosure of Invention

The invention aims to: in order to solve the problems, the vacuum air pumping system for the high-altitude ignition test and the method thereof are provided.

In order to achieve the purpose, the invention adopts the following technical scheme:

a vacuum air pumping system for high-altitude ignition test and a method thereof comprise a system body connected with a test chamber through a valve, wherein the system body consists of a cold trap, a filter, a vacuum pump set and a tail gas treatment device which are sequentially arranged along the output direction of fuel gas generated by the test.

Preferably, the cooling medium of the cold trap is cooling water or liquid nitrogen.

Preferably, the vacuum pump set is a mechanical vacuum pump.

Preferably, the tail gas treatment device is a mass transfer device adopting solution adsorption.

A vacuum air pumping method for a high-altitude ignition test comprises the following steps:

a. introducing gas generated by the test chamber into the cold trap, and condensing condensable gas in the gas on the inner surface of the cold trap;

b. introducing the gas treated by the cold trap into a filter, and filtering particles by the filter;

c. discharging the fuel gas treated by the filter in a tail gas treatment device through a vacuum pump set;

d. the tail gas treatment device is used for treating the fuel gas and discharging the fuel gas outwards.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

in this application, the cold trap can condense the condensable composition in the gas to the gas cooling, solid particle in the filter can the filtering gas, and remaining gaseous state gas passes through the vacuum pump package and takes out, and handles to satisfying the environmental protection requirement through tail gas processing apparatus, compares the air exhaust device among the prior art, can guarantee test process vacuum, and can tolerate the produced gas of high altitude ignition test.

Drawings

Fig. 1 shows a schematic diagram of a test chamber and a system body provided by an embodiment of the invention.

Illustration of the drawings:

1. a system body; 2. a valve; 101. cold trap; 102. a filter; 103. a vacuum pump set; 104. an exhaust gas treatment device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution:

a vacuum air pumping system for a high-altitude ignition test comprises a system body 1 connected with a test chamber through a valve 2, wherein the system body 1 consists of a cold trap 101, a filter 102, a vacuum pump set 103 and a tail gas treatment device 104 which are sequentially arranged along the output direction of fuel gas generated in the test, and the cold trap 101, the filter 102, the vacuum pump set 103 and the tail gas treatment device 104 are communicated through pipelines.

Specifically, as shown in fig. 1, the cold trap 101 is a device for collecting gas in a condensation manner on a cooled surface, and is used for adsorbing condensable gas or vapor, the cooling medium of the cold trap 101 is cooling water or liquid nitrogen, and the cold trap 101 needs to be cleaned periodically after the test.

Specifically, as shown in FIG. 1, to ensure that the ultimate vacuum is better than 1Pa, the vacuum pump set 103 employs a mechanical vacuum pump, such as a screw/Roots set, whose effective pumping speed is based on the predicted experimental combustion gas production Q_gAnd peak pressure P_jAnd calculating according to the following formula:

S_eff＝n(Q_g/P_j)

in the formula (I), the compound is shown in the specification,

Q_gpredicting the combustion gas production of the test, and converting the SLM (Selective mapping) into L/s according to the local environment;

P_j-peak pressure after ignition, Pa;

S_eff-effective pumping speed of the vacuum pump, L/s;

n-safety factor.

The air exists in the exhaust pipeline, so that in order to prevent explosion, the component and the flow of the fuel gas are estimated according to the ignition medium, the explosion limit of combustible components in the fuel gas is checked, and if the combustible gas exceeds the explosion limit, nitrogen is filled into the vacuum pipeline in advance to exhaust oxygen.

Specifically, as shown in fig. 1, the tail gas treatment device 104 is a mass transfer device adopting solution adsorption, such as a packed tower and an ejector tower, which increases the contact area between the solution and the gas flow and enhances mass transfer, and the solution selects a solution, such as potassium permanganate, hydrogen peroxide solution, etc., reacting with the gas component generated by the ignition component according to the gas component.

In summary, when the fuel gas generated in the test chamber is extracted, the fuel gas generated in the test firstly enters the cold trap 101, condensable gas in the fuel gas is condensed on the inner surface of the cold trap 101, and meanwhile, the temperature of the gas and particles is reduced, so that the filter 102 behind is protected;

the cooled gas leaves the cold trap 101 and enters the filter 102, the filter 102 filters solid particles generated in the combustion process of the gas, the particles are prevented from entering the vacuum pump set 103 and damaging the vacuum pump set 103, only gas components are left in the gas after passing through the filter 102, and at the moment, the gas components contain little oxygen and have low temperature, so that the problems of combustion, explosion and the like can be avoided;

the fuel gas passing through the filter 102 enters the tail gas treatment device 104 through the vacuum pump set 103, and the tail gas treatment device 104 discharges the treated fuel gas to the outside, thereby completing the whole air extraction process.

The previous description of the embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.