CN203421266U

CN203421266U - Vacuum shutoff valve

Info

Publication number: CN203421266U
Application number: CN201320438308.5U
Authority: CN
Inventors: 祁增强; 袁洪滨; 李小明; 陈展; 王可立; 赫伟涛; 蔡德慧
Original assignee: 11 Research Institute of 6th Academy of CASC
Current assignee: 11 Research Institute of 6th Academy of CASC
Priority date: 2013-07-22
Filing date: 2013-07-22
Publication date: 2014-02-05
Anticipated expiration: 2023-07-22

Abstract

The utility model belongs to the field of machines, in particular to a vacuum shutoff valve. The vacuum shutoff valve comprises a sleeve, a shell body, a valve core, a locating ring, a spring seat and a spring. A gas passage, a partition plate and a liquid passage are sequentially arranged in the shell body. At working time, gas is filled into the gas passage, and under the action of a piston, the valve core is made to move downward to enable the liquid passage to be opened. The vacuum shutoff valve is greatly improved in sealing performance and reliability in a vacuum environment.

Description

A kind of vacuum cut-off valve

Technical field

The utility model belongs to mechanical field, relates to a kind of shutoff valve, relates in particular to a kind of vacuum cut-off valve.

Background technique

China need to complete degradation soft landing task under moon landing prober Midcourse correction, braking near month, power the lunar exploration engineering second phase.Because lunar environment pressure is vacuum, and landing seeker motor needs for a long time in-orbit, repeatedly works, sealing and the functional reliability of general shutoff valve under vacuum environment is poor, in addition some shutoff valve and propellant agent time of contact shorter can not meet for a long time require in-orbit, repeatedly ability to work is not enough.

Summary of the invention

In order to solve the problem in background technique, the utility model proposes the vacuum cut-off valve that a kind of good airproof performance, reliability are high, be applicable to use under vacuum environment.

Technical solution of the present utility model is:

The utility model provides a kind of vacuum cut-off valve: comprise sleeve, housing, spool, positioning ring, spring seat and spring; Described enclosure interior is disposed with gas channel, dividing plate and fluid passage;

Described sleeve be threaded with housing and sleeve on be provided with suction port; Described piston is arranged on sleeve inner, and one end of piston is near the suction port of sleeve, and the other end contacts with spool;

Described spool is divided into three sections, is respectively positioning section, changeover portion, the section of damming; Wherein positioning section is arranged in gas channel and on positioning section and is disposed with positioning ring, spring seat and spring; Described changeover portion is arranged between gas channel and fluid passage and through dividing plate; The described section of damming is arranged in fluid passage for blocking fluid passage; The size of the described section of damming is greater than the size of fluid passage entrance;

Described positioning ring is fixedly mounted on positioning section; Described spring seat is fixedly mounted on positioning ring; Described spring one end is pressed on spring seat, and the other end withstands on dividing plate.

Between above-mentioned positioning ring and spool, be provided with the snap ring for stationary positioned ring.

The surface of contact of above-mentioned positioning ring and spring seat is sphere.

The above-mentioned section of damming is provided with sealing gasket with the surface of contact of fluid passage.

Between above-mentioned changeover portion and dividing plate, seal ring is installed.

The utility model has the advantage of:

1, the utility model adopts piston to contact from spool but not connects firmly structure and be arranged on separately different positions, can avoid the error that interferes with each other and process and install in spool and piston movement, has improved the reliability of vacuum work.

2, the utility model section of damming arranges sealing gasket with fluid passage entrance surface of contact, has guaranteed the sealing of vacuum work.

3, the outer installment of housing gas channel of the present utility model has sleeve and is threaded, and is convenient to the maintenance of enclosure interior part.

4, the surface of contact of the utility model positioning ring and spring seat is sphere, and the guiding of having guaranteed spool is not subject to the impact of external force, has improved valve core movement reliability.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Reference character is as follows:

1-housing, 11-gas channel, 12-dividing plate, 13-fluid passage, 2-spool, 21-positioning section, 22-changeover portion, the 23-section of damming, 3-spring, 4-positioning ring, 5-sleeve, 51-suction port, 6-piston, 7-snap ring, 8-spring seat, 9-sealing gasket, 10-seal ring.

Embodiment

Referring to Fig. 1, the utility model proposes a kind of vacuum cut-off valve, comprise sleeve 5, housing 1, spool 2, positioning ring 4, spring seat 8 and spring 3; Housing 1 inside is disposed with gas channel 11, dividing plate 12 and fluid passage 13.

Sleeve 5 be threaded with housing 1 and sleeve 5 on be provided with suction port 51; Piston 6 is arranged on sleeve 5 inside, and one end of piston 6 is near the suction port 51 of sleeve 5, and the other end contacts with spool 2.

Spool 2 is divided into three sections, is respectively positioning section 21, changeover portion 22, the section of damming 23; Wherein positioning section 21 is arranged in gas channel 11 and on positioning section 21 and is disposed with positioning ring 4, spring seat 8 and spring 3; Changeover portion 22 is arranged between gas channel 11 and fluid passage 13 and through dividing plate 12; The section of damming 23 is arranged on the interior size of fluid passage 13 entrances that is greater than for blocking the size of fluid passage 13 and the section of damming 23 of fluid passage 13.

Positioning ring 4 is fixedly mounted on positioning section 21; Spring seat 8 is fixedly mounted on positioning ring 4; Spring 3 one end are pressed on spring seat 8, and the other end withstands on dividing plate 12.

For the ease of dismounting, change, between positioning ring 4 and spool 2, be provided with the snap ring 7 for stationary positioned ring.

For guaranteeing the reliability of work, positioning ring 4 is sphere with the surface of contact of spring seat 8.

For guaranteeing the sealing of work, the section of damming 23 is provided with sealing gasket 9 with the surface of contact of fluid passage 13.

In conjunction with Fig. 1, when work, the suction port 51 of sleeve 5 is ventilated conventionally, gas push piston 6, piston 6 promotes spool 2 and overcomes spring 3 active forces in the situation that of pressurized, and spool 2 moves down, and the section of damming 23 of spool 2 is separated with fluid passage 13 entrances, fluid passage 13 is opened, remove and control after gas, spool 2 is return under acting force of the spring, with housing 1 fluid passage 13 entrance laminatings, due to the effect of sealing gasket 9, fluid passage 13 is dammed.

In addition, as shown in Figure 1, positioning section 21 places of spool 2 arrange snap ring 7, and snap ring 7 is connected positioning ring 4 is fixed on spool 2 with positioning ring 4, and spring 3 one end withstand on spring seat 8, and the other end is pressed on dividing plate 12; Due to the sphere-contact of spring seat 8 with positioning ring 4, therefore avoided spring 3 to occur deviation in assembling or working procedure, the unbalanced force of spring 3 can allow spring seat 8 that the problem of deflection occurs, also can not there is deflection and cause bite in the spool 2 being attached thereto, improved the reliability of spool 2 motions.

The changeover portion 22 of spool 2 is arranged between gas channel 11 and fluid passage 13 and through dividing plate 12, for guaranteeing tightness, between the changeover portion 22 of spool 2 and dividing plate 12, is provided with seal ring 10.

As shown in Figure 1, spool 2 separates with piston 6, piston 6 is arranged in sleeve 5, spool 2 is arranged in housing 1, there is each other independently guide section, avoid spool 2 and piston 6 to accumulate due to the deviation of processing dimension, form and position tolerance separately, while guaranteeing spool 2 with piston 6 interlock, do not interfere with each other, improved the reliability that spool 2 moves.

Claims

1. a vacuum cut-off valve, is characterized in that: comprise sleeve, housing, spool, positioning ring, spring seat and spring; Described enclosure interior is disposed with gas channel, dividing plate and fluid passage;

2. vacuum cut-off valve according to claim 1, is characterized in that: between described positioning ring and spool, be provided with the snap ring for stationary positioned ring.

3. vacuum cut-off valve according to claim 1 and 2, is characterized in that: the surface of contact of described positioning ring and spring seat is sphere.

4. vacuum cut-off valve according to claim 3, is characterized in that: described in the section of damming be provided with sealing gasket with the surface of contact of fluid passage.

5. vacuum cut-off valve according to claim 4, is characterized in that: between described changeover portion and dividing plate, seal ring is installed.