CN2314187Y

CN2314187Y - Hydraulic safety valve

Info

Publication number: CN2314187Y
Application number: CN 97244108
Authority: CN
Inventors: 韩伟; 吴�民; 陈红平
Original assignee: BEIJING COAL MINE MACHINERY PLANT
Current assignee: BEIJING COAL MINE MACHINERY PLANT; Chinacoal Beijing Coal Mining Machinery Co Ltd
Priority date: 1997-11-07
Filing date: 1997-11-07
Publication date: 1999-04-14
Anticipated expiration: 2007-11-07

Abstract

The utility model relates to a hydraulic safety valve, wherein, a valve core is composed of a stepped shaft with a cavity in center. A valve body is provided with a stepped through hole which is matched with the stepped shaft of the valve core inside and the valve core is arranged in the stepped through hole. An O-shaped sealing is penetrated on the valve core and is positioned in a slot on the inner surface of the valve body. A transition section is arranged on the junction of the major diameter and the minor diameter sections of the valve core. The circumferential wall of the valve core which is positioned on the transition section is provided with a through hole. The hydraulic safety valve enables the O-shaped sealing ring on the valve core to be homogeneously compressed and prolongs the service life of the O-shaped sealing ring. Besides, the diameter of an overflow hole on the valve core is enlarged on base, so the overflow quantity of the hydraulic safety valve is increased. Therefore, the hydraulic safety valve can protect an underground post with a large cylindrical diameter for a coal mine more sufficiently.

Description

A kind of deadweight safety valve

The utility model relates to a kind of valve, especially a kind of deadweight safety valve.

The valve core structure (as shown in Figure 1) that is used for the safety valve of hydraulic system under the coal mine in the prior art is very unreasonable, and spool 01 is a Cylindrical object, and its center is provided with cavity, is provided with overflow hole 02 on cavity wall.When hydraulic system pressure was enough big, liquid acted on the end of spool 01 by filter 03, promoted cylindrical spool and moved axially and promote spring seat 04 then, pressure spring 05 discharge opeing.Have a bigger gap between valve body 06 and the spool 01, making between spool and valve body can have relative motion to finish desired action, is provided with O-ring seals 07 between valve body 06 and spool 01.The safety valve of this structure is when spool is axially movable, owing to there is bigger gap between spool 01 and the valve body 06, spool can be oblique to a lateral deviation, when moving to overflow hole and O-ring seals and collide, one side flow-off of deflection will produce scratching to O-ring seals, O-ring seals just very easily damages like this, and the safety valve is broken down.In addition, the spillway discharge of existing safety valve is less, and the phenomenon that freely cylinder body is not damaged because of pressure release takes place under mine the big cylinder diameter column of the hydraulic support that can not adequately protect often.

The purpose of this utility model is to improve the deficiencies in the prior art, provides a kind of rational in infrastructure, the deadweight safety valve that can prolong the working life of the O-ring seals on the spool.And further purpose is the spillway discharge that increases the safety valve, to satisfy the needs of big cylinder diameter column.

For achieving the above object, the utility model is taked following design proposal: the safety valve comprises valve body, spool and O-ring seals, described spool is the multidiameter shaft that its center is provided with cavity, described spool is located in the ladder hole of valve body of the ladder hole that inner and a spool multidiameter shaft be complementary, described O-ring seals is arranged on the described spool and places in the groove on the valve interior surface, ladder face structure between this spool and the valve body makes the enlarged diameter section of described spool and valve body larger diameter internal bore section can constitute high-grade Spielpassung and not influence its action, the enlarged diameter section length of spool is less than the length of valve body larger diameter internal bore section, and the hole shoulder spool that arrives to valve body when the shaft shoulder of spool promptly arrives the limit position of this valve overflow.On the peripheral wall of the diameter segment of described spool evenly branch several also can be eight overflow holes; establish a changeover portion in the jointing place at enlarged diameter section mutually with reduced diameter section; on the spool peripheral wall of this changeover portion, establish a through hole; its effect is to open when valve core movement to produce a damping function in this valve process; be equivalent between spool and valve body, be provided with hydraulic spring; leave very little gap between spool enlarged diameter section and the valve body in addition; and constitute high-grade gap; the axle center that makes the axis of spool guarantee to be in basically O-ring seals at the volley; thereby make O-ring seals be subjected to uniform extruding, therefore protected O-ring seals to be difficult for being prolonged its working life by scratching.

Described valve body can be made up of outer valve and the valve body that is complementary with it sleeve, and described O-ring seals is located in the groove set on the valve body sleeve lining adjacent with spool.This structural design can make the fitting surface machining accuracy adjacent with spool be improved, thereby guarantees that its service behaviour is good, is provided with seal ring between outer valve and valve body sleeve.

For realizing the further purpose of the utility model, the overflow hole aperture of existing spool is increased, the section area sum of existing spool overflow hole is 0.22 with the ratio of the sectional area of spool, the ratio of the total sectional area sum of the spool overflow hole of safety valve and the section area of spool corresponding part increases to and is 0.4-0.6, so promptly can increase the spillway discharge of this valve greatly.

The deadweight safety valve that the utility model provides is by changing cylindrical valve spool into the stepped shaft spool; and to the relevant structural change of associated components do; make the O-ring seals pressurized on the spool even; be difficult for by scratch; prolonged its working life greatly; increase the diameter of overflow hole on the spool in addition on its basis, improved the spillway discharge of this valve, the big cylinder diameter column that uses under the coal mine that more can adequately protect.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is the main sectional view of deadweight safety valve in the prior art

The main sectional view of the deadweight safety valve that Fig. 2 provides for the utility model

Embodiment:

As shown in Figure 2, major diameter be Φ 10mm, minor diameter be Φ 6mm and be provided with changeover portion therebetween, total sectional area with 11, eight overflow holes 11 of overflow hole that to be distributed with eight diameters equably on the peripheral wall of stepped shaft spool 1 of center hole 10 be 1.4mm is 0.435 with the ratio of the sectional area of the spool reduced diameter section of Φ 6mm.On the peripheral wall of changeover portion spool, be provided with the hole 12 that a diameter is Φ 1mm in addition.Constitute high-grade Spielpassung than enlarged diameter section in the stepped shaft endoporus 20 of the enlarged diameter section of spool 1 and valve body sleeve 2, groove is equipped with the O-ring seals 3 that also is enclosed within on the spool 1, outer valve 4 connects with valve body sleeve 2 couplings establishing on the inwall of reduced diameter section.

Claims

1, a kind of deadweight safety valve, it comprises valve body, spool and O-ring seals, it is characterized in that: described spool is the multidiameter shaft that its center is provided with cavity, described spool is located in the ladder hole of valve body of the ladder hole that inner and a spool multidiameter shaft be complementary, described O-ring seals is arranged on the described spool and places in the groove on the valve interior surface, the enlarged diameter section length of spool is less than the length of valve body larger diameter internal bore section, several overflow holes evenly distribute on the peripheral wall of the diameter segment of described spool, establish a changeover portion in the jointing place at the spool enlarged diameter section mutually with reduced diameter section, on the spool peripheral wall of this changeover portion, establish a through hole.

2, a kind of deadweight safety valve according to claim 1 is characterized in that: described valve body is made up of outer valve and the valve body sleeve that is complementary with it, and described O-ring seals is located in the groove set on the valve body sleeve lining adjacent with spool.

3, a kind of deadweight safety valve according to claim 1 is characterized in that: the ratio of the total sectional area sum of described spool overflow hole and the section area of spool corresponding part increases to and is 0.4-0.6.

4, a kind of deadweight safety valve according to claim 3, it is characterized in that: the total sectional area of 11, eight overflow holes 11 of overflow hole that to be distributed with eight diameters equably on the reduced diameter section peripheral wall of described spool be 1.4mm is 0.435 with the ratio of the sectional area of the spool reduced diameter section of Φ 6mm.

5, a kind of deadweight safety valve according to claim 1 is characterized in that: the through-hole diameter of establishing on the spool peripheral wall of described changeover portion is Φ 1mm.