SU964227A2 - Hydrogen pump - Google Patents

Description

(54) PUMP FOR DROP

one

The invention relates to vacuum technology, more precisely to the oil-free means of pumping hydrogen isotopes, and can be used in various devices and processes that require the removal of hydrogen.

A pump for hydrogen pumping is known, containing a membrane of palladium or its alloys, one side of which faces the pumped volume and aruga into the surrounding atmosphere (air), which provides chemical bonding of hydrogen. The pump is also equipped with a heater allowing the membrane to be heated to 600 ° C.

and more than 11

The disadvantage of this pump is the low specific speed of pumping and the long time to reach the ultimate vacuum.

According to the main author. Ev, No. 653425, a pump for hydrogen pumping is known, comprising a housing with a nozzle for supplying the pumped eye and a heated diaphragm performed in the form of a fixed

on the casing of pipes from a material with high permeability to hydrogen, mainly palladium

A disadvantage of the known pump is a large time for reaching the limit vacuum, since when the pump is turned on, gas molecules sorbed by the membrane desorb into the pumped volume.

The purpose of the invention is to reduce pumping.

This goal is achieved by the fact that. A non-sprayed getter is placed in the well-known pump at the bottom of the pipes.

A vacuum valve is installed between the pipe and the pipes.

The drawing shows the proposed pump, a longitudinal section.

The pump includes a housing 1 with a pipe

Claims (2)

20 2 for supplying pumped gas. A palladium diaphragm, made in the form of pipes 3, is attached to body 1. The pipes 3 are fixed to body 1. so that their distance is connected to the pipe 2. At the bottom of the pipes 3, there is a non-spatter getter (- 16% 8 ) 4. Outside the pipes 3, the heater is an epilental heater 5 that serves to maintain the working temperature of the diaphragm and heater 6 to maintain the working temperature and regenerate the getter 4. There is a vacuum valve 7 located between the diaphragm and nozzle 2 Chromel-Copel those rmopar 8 with meter 9. Hacod works as follows. After connecting to the pumped 5 volume with some partial pressure of hydrogen with the valve closed 7, the diaphragm and getter 4 are heated to 500 and 300-4 ° C, respectively. Since the cavity of the pipes 3 is isolated20 from the vacuum volume by means of valve 7, the whole is desorbed during heating to the working temperature of the diaphragm; the gas is inside the pipes 3 and is pumped out by the getter 4, the temperature 1) and which is maintained optimal (35 ° C) with the help of the autonomous heater 6. The number of getter 4 is selected from the calculation so that its pumping speed is sufficient for pumping out the desorbing gas, and is determined in the specific case of the specific case by the geometrical dimensions and operating mode of the vacuum system 74 pumping speed) opens valve 7. Hydrogen in the vacuum volume penetrates heated palladium and binds chemically with oxygen to. back side of the diaphragm, form a water. Thus, since in the proposed pump, the gas desorbed during heating does not enter the volume being bled out, but the getter time to reach the ultimate vacuum, which is located in the lower annular portion of the tube cavity, is drained. . The invention of the pump for pumping hydrogen according to ed. St. No. 653425, characterized in that, in order to reduce the pumping time, a non-sprayed getter is placed in the lower part of the tubes, 2. The pump according to claim 1, is about that with the connection between the nozzle and the tubes vacuum valve. Sources of information, taken into consideration in the examination of 1, Patent of Great Britain N9 9504О5, CL. PIN, published. 1961. 2. USSR author's certificate number 653425, cl. f 04 B 37/14, 1979.