CN2804514Y

CN2804514Y - Soft sealing structure of valve

Info

Publication number: CN2804514Y
Application number: CN 200520070929
Authority: CN
Inventors: 顾金良
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-04-18
Filing date: 2005-04-18
Publication date: 2006-08-09
Anticipated expiration: 2015-04-18

Abstract

The utility model relates to a soft sealing structure of a valve, which is especially suitable for a two-way liquid-gas control valve, a three-way liquid-gas control valve, a four-way liquid-gas control valve, etc. serving liquid or gas as a flow medium to be used for the soft sealing between a valve core and a valve body. The soft sealing structure of a valve comprises a valve body and a valve core and an O-shaped sealing ring which are arranged in the valve body, wherein the O-shaped sealing ring is a composite ring which is composed of an inner ring and an outer ring, wherein the radial dimension of the outer ring is bigger than that of the inner ring, whereas, the axial dimension of the inner ring is bigger than that of the outer ring; the valve core is formed with a T-shaped telescopic cavity which is composed of grooves which are expanded and arranged on both sides of the T-shaped telescopic cavity and a slit which is shrunk in the middle of the T-shaped telescopic cavity; the O-shaped sealing ring is tightly sheathed on the valve core; the inner ring of the O-shaped sealing ring is arranged in the grooves on both sides of the T-shaped telescopic cavity, and however, the outer ring is embedded in the slit of the T-shaped telescopic cavity, and moreover, the outer margin of the outer ring and the valve cavity wall of the valve body are in tight fit. The utility model has the advantages of simple structure and convenient installation, and the sealing ring can not get loose, therefore the sealing performance is good, and the service life of the utility model can not be affected when working under the condition of high-pressure difference and deep-etching environment.

Description

A kind of soft sealing structure of valve

Technical field

The utility model relates to a kind of soft sealing structure of valve, under the environment of, the deep-etching poor of suiting especially in high pressure, with liquid or gas as flowing medium such as on the liquid gas control valves such as two logical, threeway, four-way, be used for the soft seal between spool and the valve body.

Background technique

At present, common on the market nearly all is hard sealing such as employed sealing configuration on the liquid gas control valves such as two logical, threeway, four-way.And the existing soft sealing structure that is adopted in this field mainly contains two kinds, and a kind of is that O-ring seals directly is clamped on spool or the valve body, and O-ring seals is formed with spool and valve body drive fit respectively; Another kind is to be that the seal ring pine of O shape is put in the straight trough of spool with sectional shape, is realized being sealed and matched with spool and valve body respectively by the inside and outside circle of seal ring.The defective that preceding a kind of soft sealing structure exists is: at first, when moving in the valve pocket of spool at valve body, because O-ring seals does not have unnecessary resiliently deformable space, adding the O-ring seals surface is drive fit with cooperating of slip surface, its pressure is very big, the power that not only promotes spool wants big, and because of the surface friction drag between O-ring seals and the slip surface greatly very easily weares and teares, influences working life; Secondly, this sealing configuration be not suitable under the higher environment of pressure difference, working (as pressure difference greater than 1.0Mpa), because when by the O-ring seals that pressed during back and forth in the high low pressure intersection of valve body, because it is very fast in the speed of intersection liquid or gas flow, big pressure difference can be pulled out the place of clamping to O-ring seals and return voluntarily at leisure, and O-ring seals very easily damages in course of action; In addition, this sealing configuration is not suitable for working under strong rotten environment, for example sealing ring material is had in the mordant in other words medium of slight permeability when O-ring seals is placed on, resemble O-ring seals with neoprene system when being placed in the freon, because O-ring seals all has a certain amount of expansion in strong rotten environment, and this structure does not have the distortion of very easily turning up for the space of its expansion, very easily damages in course of action.Then a kind of sealing configuration, as shown in Figure 1, it is to be that the direct pine of seal ring of O shape is put in the straight trough of spool with sectional shape, seal ring is realized being sealed and matched with spool and valve body respectively by its inside and outside circle, the defective that this sealing configuration exists is: when the working pressure difference in the valve pocket is big, owing to be that pine is put, O-ring seals is easy to deviate from straight trough and loses its due seal action.

Summary of the invention

The purpose of this utility model be to provide a kind of simple in structure, easy for installation, seal ring can not get loose and work under the good seal performance,, strong corrosive environment poor in high pressure and also can not influence the soft sealing structure of the valve in working life.

The purpose of this utility model reaches like this, a kind of soft sealing structure of valve, it comprises valve body 1, is located at spool 2, O-ring seals in valve body 1 valve pocket, characteristics are: described O-ring seals is a compound circle, it is made of inner ring 5 and outer ring 6, wherein the radial dimension of outer ring 6 is greater than the radial dimension of inner ring 5, and the axial dimension of inner ring 5 is greater than the axial dimension of outer ring 6; Be formed with T shape telescopic cavity on the described spool 2, this T shape telescopic cavity expands the groove 4 and the middle narrow slit of contracting 3 of establishing by both sides and constitutes, O-ring seals tightly is enclosed within on the spool 2, its inner ring 5 pines place T shape telescopic cavity both sides groove 4 in, and outer ring 6 is embedded in the slit 3 in the middle of the T shape telescopic cavity, and is drive fit between the valve pocket inwall of the outer rim of outer ring 6 and valve body 1.

Spool 2 described in the utility model is a split-type structural, it is to be locked after mutual socket by the above spool of two joints to form again, on the corresponding position of adjacent two joint spools, be formed with groove 4 respectively in opposite directions, form T shape telescopic chute by the slit 3 of 4 of the groove of establishing in opposite directions 4 and grooves.

The inner ring 5 of O-ring seals described in the utility model and outer ring 6 integral productions form.

Locking mode between the split type spool 2 described in the utility model is detachable locking.

The utility model detachable locking recited above be spirally connected or rivet in any one.

Inwardly convex with boss 7 on the inner ring 5 of O-ring seals described in the utility model.

The utility model has been owing to done improvement to the sectional shape of O-ring seals and the shape of the groove on the corresponding spool 2, inner ring 5 pines of O-ring seals are placed in the groove 4 of T shape telescopic cavity and has certain extending amount, can adapt to and work under the environment of corruption by force; Simultaneously because O-ring seals is embedded in the T shape telescopic cavity that matches with its shape, the inner ring 5 and the shaft shoulder of 6 jointing places, outer ring are limited by the step surface of T shape telescopic cavity, even therefore under the situation of high pressure difference, O-ring seals also can not be forced out outside the chamber of T shape telescopic cavity and be damaged in course of action, has guaranteed the working life and the excellent sealing performance of O-ring seals equally.

Description of drawings

Fig. 1 is an original structure schematic representation of the present utility model.

Fig. 2 is an example structure sketch of the present utility model.

Fig. 3 is a kind of cross section structure figure of O-ring seals of the present utility model.

Fig. 4 is the another kind of cross section structure figure of O-ring seals of the present utility model.

Fig. 5 is applied to structural representation on the four-way change-over valve for the utility model.

Embodiment

Please refer to Fig. 3 and Fig. 4, Fig. 3 has illustrated a kind of cross section structure figure of O-ring seals of the present utility model, it is to be made of inner ring 5 and outer ring 6, wherein the radial dimension of outer ring 6 is greater than the radial dimension of inner ring 5, and the axial dimension of inner ring 5 is greater than the axial dimension of outer ring 6, inner ring 5 and outer ring 6 integrally moulded forming, its sectional shape is similar to T shape.The O-ring seals of this sectional shape mainly is applicable on the less liquid gas control valve of spool size and uses.Fig. 4 has illustrated the another kind of cross section structure figure of O-ring seals of the present utility model, its sectional shape is similar to quincunx, wherein, inner ring 5 duplicates in Fig. 3 with outer ring 6, what change is inwardly to have additional a circle boss 7 on the wall body of inner ring 5, boss 7 can form with inner ring 5, outer ring 6 integral productions, and the effect of boss 7 is in order to reduce the surface friction drag between O-ring seals and the spool 2.The structure in this quincunx cross section mainly is applicable on the larger-size liquid gas control valve of spool, because when the spool size is big, because the inner ring 5 of O-ring seals and the area of contact between the spool 2 increase, O-ring seals and spool are also increased at the surface friction drag of working procedure, therefore, in order to reduce area of contact, and then the resistance of reducing friction, on the inner ring 5 of O-ring seals, set up a circle boss 7.

Please refer to Fig. 2, the spool of illustrating among Fig. 22 divides body structure for two-segment type, it is to be formed with the groove of establishing in opposite directions 4 respectively in the end of two joint spools 2, two joint spools are locked on O-ring seals in the T shape telescopic cavity by the mode that spiral shell bud and screw screw then, wherein the outer ring 6 of O-ring seals is positioned at the slit 3 of T shape telescopic cavity, inner ring 5 then is positioned at the groove 4 of T shape telescopic cavity, and and keep certain spacing between the cell wall of groove 4, have a certain amount of extendable room to guarantee O-ring seals.Simultaneously, when mounted, should guarantee to be drive fit between the inner ring 5 of O-ring seals and the spool 2, and form interference fit between the valve cavity wall of edge and valve body 1 outside the outer ring 6.Locking mode between the utility model spool recited above is not unique, and it can also be to adopt screw or closing-up etc., can realize detachable locking as long as can satisfy valve core chamber.Please continue with reference to Fig. 2, in Fig. 2, if valve pocket 9 is the zone of high pressure, valve pocket 8 and interface 10 are low pressure area, and the present position is the high low pressure closed condition among the figure, at this moment, O-ring seals is subjected to a pressure from left to right, makes the right side of O-ring seals be close to the right wall of T shape telescopic cavity, and this pressure makes O-ring seals that the trend that breaks away from T shape telescopic cavity be arranged, but because the mating reaction of T shape step makes O-ring seals can not leave T shape telescopic cavity.When moving to right under the effect of spool 2 in external force and be moved to valve pocket 9 with interface 10 conductings, at this moment, because liquid stream or air-flow be 6 surperficial flow at high speed in the outer ring, the pressure in left side and the pressure difference maximum of outer ring 6 outer most edge in the T shape telescopic cavity, the outward pressure that O-ring seals is subjected to is also maximum, but, equally can not leave T shape telescopic cavity because O-ring seals is locked by the step surface of T shape telescopic cavity yet.When spool 2 continues to move to right near valve pocket 8 time, owing to be processed with the smooth conical surface 11 between interface 10 and the valve body 1, thus make O-ring seals do not entered into valve pocket 8 to the nothing wound smoothly by the elasticity extruding, thus the unlatching between valve pocket 9 and the valve pocket 8 finished.The utility model is because after adopting above-mentioned soft sealing structure, works under the environment of, deep-etching poor in high pressure, and O-ring seals neither can break away from T shape telescopic cavity, can damaged yet, thereby good seal performance, long service life, and also simple in structure, it is convenient to install.

Please refer to Fig. 3, Fig. 3 has illustrated the utility model to be applied to the structure diagram on the four-way change-over valve.In the figure, place the spool 2 in the valve body 1 to constitute by three spools that save splits, the two ends of a joint spool are formed with groove 4 respectively wherein, it is nested with on the first segment spool, with be formed with the T shape telescopic cavity that cooperates for O-ring seals between the first segment spool, afterbody at the first segment spool is shaped on screw thread 13 simultaneously, the 3rd joint spool is finished and first by screw in the middle of it 12 and screwing of screw thread 13, detachable locking between the middle joint spool, similarly, end at the 3rd joint spool also is provided with groove 4, is formed with the T shape telescopic cavity that cooperates for O-ring seals between the groove 4 of this groove 4 and one joint spool end, centre.When assembling, inner ring 5 with O-ring seals places in the groove of establishing in opposite directions 4 earlier, outer ring 6 on when locking O-ring seals is embedded in the slit 3 of T shape telescopic cavity, and to make the outer rim of outer ring 6 and valve cavity wall be drive fit, and is interference fit between boss 7 on the inner ring 5 and the spool 2.The utility model lift and the operating principle of four-way change-over valve when opening or closing and Fig. 2 structure identical mutually, therefore no longer superfluous here and.

Claims

1, a kind of soft sealing structure of valve, it comprises valve body (1), is located at spool (2), O-ring seals in valve body (1) valve pocket, it is characterized in that described O-ring seals is a compound circle, it is made of inner ring (5) and outer ring (6), wherein the radial dimension of outer ring (6) is greater than the radial dimension of inner ring (5), and the axial dimension of inner ring (5) is greater than the axial dimension of outer ring (6); Be formed with T shape telescopic cavity on the described spool (2), this T shape telescopic cavity expands the groove (4) and the middle narrow slit of contracting (3) of establishing by both sides and constitutes, O-ring seals tightly is enclosed within on the spool (2), its inner ring (5) pine place T shape telescopic cavity both sides groove (4) in, and outer ring (6) be embedded in the slit (3) of T shape telescopic cavity, and be drive fit between the valve pocket inwall of the outer rim of outer ring (6) and valve body (1).

2, the soft sealing structure of a kind of valve according to claim 1, it is characterized in that described spool (2) is a split-type structural, it is to be locked after mutual socket by the above spool of two joints to form again, be formed with groove (4) respectively in opposite directions on the corresponding position of adjacent two joint spools, nationality forms T shape telescopic chute by the slit (3) between groove of establishing in opposite directions (4) and groove (4).

3, the soft sealing structure of a kind of valve according to claim 1 is characterized in that the inner ring (5) of described O-ring seals and outer ring (6) integral production form.

4, the soft sealing structure of a kind of valve according to claim 1 is characterized in that the locking mode between the described split type spool (2) is detachable locking.

5, the soft sealing structure of a kind of valve according to claim 4, it is characterized in that described detachable locking be spirally connected or rivet in any one.

6, the soft sealing structure of a kind of valve according to claim 1 is characterized in that inwardly convexing with boss (7) on the inner ring (5) of described O-ring seals.