CN1016212B - Pressure limited valve with dry chamer including spring - Google Patents
Pressure limited valve with dry chamer including springInfo
- Publication number
- CN1016212B CN1016212B CN 88100477 CN88100477A CN1016212B CN 1016212 B CN1016212 B CN 1016212B CN 88100477 CN88100477 CN 88100477 CN 88100477 A CN88100477 A CN 88100477A CN 1016212 B CN1016212 B CN 1016212B
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- Prior art keywords
- valve
- pressure
- hole
- plunger
- spring
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Abstract
The present invention relates to a pressure limited valve mainly used for underground hydraulic supports. A middle member screwed in a valve shell is arranged between a spring retainer and a guiding device formed at the inlet side, and therefore, pressure mediums and dirt can not enter a spring cavity. A movable sealing plunger piston is arranged on the middle member with an axial hole equivalent to a plunger piston hole; one side of the movable sealing plunger piston is butted with the spring retainer, and the other side is butted with a valve plunger piston; the movable sealing plunger piston is sealed by an O-shaped ring. A radial outlet hole with an outward side surface is arranged in a transition zone between the valve plunger piston and the sealing plunger piston; the pressure mediums pass through the valve plunger piston, cross over the O-shaped ring and then is quickly and reliably led out by the valve plunger piston without entering the interior of the main body of the pressure limited valve.
Description
The present invention relates to a kind of pressure-limit valve, concrete is the pressure-limit valve that is used for the hydraulic support of underground mining, this valve has a valve housing, Movable valve plunger in the plunger hole that the inlet side of housing and outlet side be spring-loaded by, be configured in inlet side is separated, and perhaps is connected when overload occurring; Valve piston is loaded by a valve spring, one side of this spring is supported on the valve seat ring that is sitting on the valve piston, opposite side then is supported in the spring thrust supporting that constitutes the valve housing top, and required down in off position sealing realizes by being contained in O type ring in the groove in the plunger hole and cross the radial hole that passes from its axial bore on valve piston.
Use pressure-limit valve, overload occurs in order that prevent hydraulic system.In underground mining, exploit and other occasion comprehensively, be the cavity that will keep the miner to hew out especially, adopted the individual prop and the frame of hydraulic pressure, they can be subjected to, and press on punching press ground and the harm of other precipitate load.In order to bear this class sudden surge, the pressure-limit valve of corresponding installing links to each other pressurized space with atmosphere, like this, just makes the pressurized fluid physical efficiency promptly and with corresponding amount discharge, till sudden surge is balanced.
Known pressure-limit valve working condition is also not fully up to expectations.Disclosed pressure limiting valve housing has been installed a kind of so-called smooth characteristic spring that has in D.B.P. OS 33 14 837.6.As for how understanding smooth spring characteristic curve, not open in above-mentioned file.When valve event, pressurized liquid passes valve piston, is imported into spring chamber after spring-leaf retainer is mentioned.Though valve housing is provided with side opening, a part of pressure medium is overflowed, and another part pressure medium can pass spring chamber and adjust the hole discharge of screw.Except that the high lift effect deficiency of valve spring or valve seat ring, may produce pollution owing to infiltrate the dirt of adjusting screw to spring chamber on the other hand on the one hand owing to pressure medium here.Will make that so the long-term function of valve is not good.This situation is applicable to the pressure-limit valve of D.B.P.-model utility 82 16 072.4 too.Here also can point out a big defective, promptly only be provided with a lateral opening, therefore only have a small amount of pressurized fluid physical efficiency to escape into atmosphere naturally by this approach in the spring-leaf retainer bottom.In addition, the diameter in the hole in the valve piston is more much smaller than the aperture in the guiding device also is bad.
Basic task of the present invention is under the situation of the best high lift effect of maintaining valve gate seat circle scope, to make valve spring and valve housing inside not have pressure medium to enter.
By the present invention, this task solves by following approach, promptly between spring-leaf retainer and formation guiding device inlet side, that have plunger hole and valve piston, load onto a middleware that is tightened on the valve housing, it has a corresponding axial bore and one sealed plunger movably in the hole, the sealing plunger seals the hole by an O type ring, and one side is supported on the spring-leaf retainer, and another side is supported on the valve piston; In middleware, in the transition region of valve piston/sealed plunger, design has from plunger hole or axial bore is drawn, pass middleware and valve housing big radially exit orifice.
Prevented effectively that thus dirt from entering spring chamber and the influence of the action degree of accuracy that therefore may cause, because pressurized liquid does not need to flow out by spring thrust supporting or adjustment screw again, and because pressurized liquid can not enter valve housing or spring chamber at all.Pressure medium is derived by the side tap hole, does not enter the spring zone, and spring is not exerted an influence.Intermediate plunger is convenient to produce and reach the matched accuracy, and in addition, it also has following advantage, and promptly need only pack into easily has the middleware of intermediate plunger and sealed plunger, and each component that pressure-limit valve uses so far can remain unchanged.Generally speaking, this is a kind of assembled formula structure, according to selected matching relationship, helps underground application fully.
The structure of a kind of practicality of the present invention, its sealed plunger by a plastic bushing with low friction factor around.Because a kind of like this plastic sheath that rubs and reduce, for example teflon overcoat or teflon sleeve, the high lift effect is not subjected to the influence of additional member.Say definitely, so just guaranteed that in the valve piston action, sealed plunger is together action also, and need not to use the power that adds.By the method that the pressure-limit valve opening allows pressure medium flow out, can determine operating point exactly with the valve spring that is contained in valve housing or the spring chamber.
The a large amount of pressure mediums that flow out via plunger hole and plunger can be reliably, immaculately derived, because by another design of the present invention, be distributed with 8 radially exit orifices on circumference.By these holes, all pressure mediums are through after turning to accordingly, can be promptly, no problemly flow out from pressure-limit valve.
For the ease of assembling, middleware is provided with a screw thread, and it is corresponding with the screw of guiding device and valve housing.As mentioned above, be scheduled to a kind of assembled formula structure thus, adopted this structure, available same valve matrix is made the spring chamber that pressure medium opens and closes.
Two-piston is crooked each other can be prevented that promptly sealing column is plugged with a flange reliably by following approach, and valve piston has an even surface in a side of adjoining with flange.The power of sending from valve piston fully inerrably is sent to sealed plunger, and this plunger promotes spring-leaf retainer and spring, and under corresponding pressure load they is pressed together.
Known pressure-limit valve discharge capacity be about 40-60 liter/minute, be more than 100 liters by the flow of pressure-limit valve per minute of the present invention.When the radial hole of valve piston and axial bore and radially the liquid stream net sectional area of exit orifice equate or when flowing net sectional area greater than the liquid of input pipeline, by flow of the present invention can also bring up to 400 liters/minute.In this way, whole pressure mediums of introducing via input pipeline be guided through pressure-limit valve rapidly and reliably, and similar problem or loss do not appear in the change of reason cross section when pressure-limit valve moves.The degree of accuracy of such pressure-limit valve is very high, and it both can be used as the individual prop valve, also can be used for shield support or the control valve group of the support of taking a step.The application area of this class pressure-limit valve thereby significantly expansion, and very advantageously, this all is to be derived from identical structural principle.Because it is identical to be used for the manufacturing process of valve of different occasions, this just guarantees all pressure-limit valves, aspect Security, all has same numerical value especially.
In order to achieve the goal with less component, the present invention proposes again, valve piston and sealed plunger are designed to the monomer plunger, and plunger hole has enlarged, and be designed to hold the sleeve pipe that is equivalent to plastic bushing, simultaneously, the axial bore of valve piston and radial hole stop below adjacent radially exit orifice and are provided with.If the plunger hole that has particularly enlarged reaches O type ring or holds the groove of this O type ring, it is just easy to import O type ring, wants its position of scrutiny simultaneously, and simultaneously, plastic bushing makes apparent friction reduce.Generally speaking, so just can reach favourable close value.In addition, also be an advantage with the little wearing and tearing of using flexible pipe to interrelate.Here also use teflon to make sleeve pipe targetedly, because the friction factor advantageous particularly of this material.
If corresponding part all combines with guiding device, then may in the valve piston scope, be rich in advantage ground and adopt the valve piston of an increasing, thereby have more favourable liquid stream net sectional area.The present invention proposes herein, and guiding device should design to such an extent that can hold sealed plunger, valve piston and exit orifice radially, and is connected with valve housing by the centering disk that has internal and external screw thread.Guiding device has just been adorned two valve pistons or a compound valve piston like this, valve housing becomes a sealed whole body together with the valve spring that installs in it, in its upper extent, seal, and seal by centering disk in one side on the other side by adjusting screw and spring thrust supporting.On centering disk, be provided with the hole that has respective threaded, have sealed plunger, valve piston and radially the guiding device of exit orifice can screw in it.On such device, the diameter of radial hole is decreased to 2.2 to 2.5mm with can being rich in advantage, and the line footpath of O type ring can be reduced to 1.8 to 2mm, and this helps to reduce the stress of O type ring, thereby also helps to improve the action degree of accuracy of this class valve.In addition, O type ring is crossed quickly, pressure-limit valve thereby also action quickly.On purpose improved the high lift effect at last, this means, promoted spring-leaf retainer thereby pressurized liquid on purpose is used to promote valve piston, last again corresponding promotion spring flows into atmosphere thereby open opening by pressure medium.
The closed exit orifice that the inside of spring chamber can have by spring thrust supporting is simply checked.In this case, especially may be by simple blocking device and the corresponding repacking middleware that takes out in the exit orifice, and this pressure-limit valve is changed over pressurized liquid or pressure medium via the outside the sort of pressure-limit valve of guiding of spring chamber again.If spring thrust supporting correspondingly is equipped with, repacking also is corresponding simple.
If do not plan to adopt assembled formula structure, it is favourable then allowing middleware and guiding device constitute an element of construction.In valve housing or spring chamber, only need establish like that a screw thread and be used for screwing the middleware of combination and guiding device just.
Feature of the present invention particularly in provide a kind of simple in structure, act on cocksure pressure-limit valve, it have reliable high lift effect, but the inside of housing does not have pressure medium and pollution in the spring-leaf retainer scope.Additional advantage is, a kind of element of construction is provided, and its allows when needed the pressure-limit valve that has the dry type spring chamber to be designed to or to repack into the pressure-limit valve that has conventional head pressure medium.As a whole, combination manufacturing is possible, so not only can reduce production costs, and also may limit necessary stock.
Further details of the present invention and advantage can draw from the description of following accompanying drawing, have provided the most preferred embodiment with necessary details and part among the figure.Wherein:
Fig. 1 is the sectional drawing of pressure-limit valve that has the spring chamber of sealing;
Fig. 2 is the sectional drawing of the pressure-limit valve of per minute 400 liters for capacity;
Fig. 3 is a valve of pressing the band monomer valve plunger of Fig. 1;
Fig. 4 for by valve housing, the sectional view in the spring-leaf retainer scope.
The pressure-limit valve (1) that Fig. 1 to Fig. 4 describes has a Tube-like valve housing (2), in the spring chamber (3) of its inside valve spring (4) is housed.Valve spring leans against the side has a beveled edge (6), centre to have on the spring-leaf retainer (5) of a groove (7).Spring-leaf retainer (5) is used for guide springs when passing in opposite directions, and the even transmission of the power of assurance.The backstop (8) of the stroke limiting of spring-leaf retainer (5) on the inwall that is arranged on spring chamber (3) or valve housing (2).Fig. 4 shows further details, provides by Fig. 4 to further specify.
Valve spring (4) is supported on the spring-leaf retainer (5) on the one hand, also is supported on simultaneously in the spring thrust supporting (9).This spring thrust support design becomes to adjust the form of screw, and valve spring (4) more or less all is applied in stress by it.Valve spring is pressed to valve piston (10) or sealed plunger (11) with same power by spring-leaf retainer (5) then.
Sealed plunger (11) is positioned at the middleware (12) that is tightened on valve housing (2) lining, and this middleware has screw thread (15).Be provided with an axial hole (16) in middleware (12) inside, sealed plunger (11) can move in the hole.By being located at the O type ring in the groove (14), can guarantee not have pressure medium to infiltrate in the spring chamber (3) along sealed plunger (11).
From sealed plunger (11) in the zone of valve piston (10) transition, radially exit orifice (17,18) diameter is very big, to guarantee that pressure medium is from being exported to the atmosphere in the clear here.
Under the situation of g-load, also promptly when pressure-limit valve (1) moves, this pressure medium enters valve piston (10) position by the plunger hole (20) that passes whole guiding device (21).Movably valve piston (10) is positioned at the centre of guiding device (21) in plunger hole (20), and this device has a screw thread (22), and can be tightened on by this way on the valve housing (2).Pressure medium flows through the radial hole (23,24) that is formed on axial bore and becomes the end of blind hole from the hole wall of plunger hole (20) through axial bore (25) the arrival plunger hole (20) of valve piston (10) lining.Because pressure medium can not upwards arrive radially exit orifice (17,18) position by the O type ring (26) that is located in the groove (27), so valve still seals.Have only when valve piston (10) applied pressure having been surpassed the spring force of valve spring (4) by pressure medium; valve piston (10) and sealed plunger (11) just make progress away; make radial hole (23; 24) cross O type ring; pressure medium just can pass through radially exit orifice (17 subsequently; 18) discharge, up to the object of need protection for example the pressure in the piston drop to unlikely when jeopardizing whole system again till.Spring force is preponderated again then, and valve spring (4) is exerted pressure to sealed plunger (11) by spring-leaf retainer (5), subsequently valve piston (10) is sent back to its initial position again, like this, after radial hole (23,24) was crossed O type ring (26) again, valve just sealed up again.
In order to reduce friction, sealed plunger (11) with plastic bushing (28) around.Simultaneously in the scope that the function of this plastic bushing at first is not allow a little pressure medium bring O type ring (13) into.O type ring (13) just has only additional Safety function.By the lower end of sealed plunger (11) is designed to flange (30), the upper end of valve piston (10) is designed to a corresponding even surface (31), just can help valve piston (10) more and continue motion inerrably.
Pressure-limit valve shown in Figure 1 (1) can be discharged about 100 liter pressure mediums by per minute, but pressure-limit valve shown in Figure 2 then per minute is discharged pressure medium until 400 liters, be provided with a corresponding valve spring (4) on the one hand for this reason, on the other hand, in each hole, has corresponding liquid stream effective cross section.The size of the liquid stream effective cross section in these holes is suitable with the liquid stream effective cross section of input pipeline, and like this, all pressure mediums that are imported into can be discharged by pressure-limit valve really.On the pressure-limit valve of Fig. 2, valve housing is designed to tubulose.In fact the top is made of the spring thrust supporting (9) that is spun on the valve housing, and the bottom has the centering disk (33) of internal thread (35) to constitute by an existing outside thread (34).Therefore centering disk (33) also is spun on the valve housing (2), and the guiding device (21) that is designed to corresponding prolongation herein is by outside thread (35 ') or a superincumbent screw thread is set is tightened on the centering disk (33).
In the respective post consent (20 ') in guiding device (21), both be provided with valve piston (10), also be provided with sealed plunger (11).Join domain at two plungers (10,11) is equipped with radially exit orifice (17,18), when valve piston (10) is pressed into when enough far away above O type ring (26), pressure medium just can by these two radially exit orifice be discharged from.
In the past, the line of O type ring (26) directly is equal to or greater than the diameter of radial hole (23,24), and people thought once that this was to guarantee that sealing is necessary.The inventor has dwindled the line footpath of O type ring significantly now, confirm that unexpectedly sealing is guaranteed, and the reaction precision of valve improves also.Reason is that valve piston (10) is crossed O type ring (26) rapidly and easily.
Among the embodiment of Fig. 3, in the axial bore and guiding device (21) of middleware (12), piston mobile is designed to single piston (36).All be provided with sleeve pipe (37) and plastic bushing (28) at axial bore (16) and in piston hole (20), monomer plunger (36) is movable therein.Low, the action degree of accuracy height of friction factor consequently.In addition, in such an embodiment, the join domain of valve piston (10) and sealed plunger (11) loss can not occur, and axial bore (25) is designed to blind hole, and the degree of depth has only just reached half of single piston (36) total length, and crosses radial hole (23,24).When valve piston (10) rose, also exit orifice (17,18) was directed in the atmosphere pressured fluid from passing through radially here.
The embodiment's of Fig. 3 advantage is to be convenient to repack into allow pressure medium enter atmosphere by spring chamber (3).In order in the scope of spring-leaf retainer (5), to produce best high lift effect, be provided with guide groove (38,39), in addition, also be provided with the beveled edge of having mentioned (6) of spring-leaf retainer (5) and the exit orifice (40) in the spring thrust supporting (9) in the above.
The clear structure of having represented spring chamber (3) wall upper rail (38) of Fig. 4, guide groove (38,39) cross backstop (8), be up to the height of spring thrust supporting (9), need simultaneously to interrupt to constitute backstop (8), spring-leaf retainer (5) is stopped by backstop when motion, offs normal so that guarantee to prevent valve spring (4).
Claims (10)
1, a kind of pressure-limit valve, concrete is the pressure-limit valve that is used for the hydraulic support of underground mining, it has a valve housing, its inlet side and outlet side are spring-loaded by one, the interior Movable valve plunger of plunger hole that is configured in inlet side is separated, maybe when overload occurring, be connected, valve piston is loaded by a valve spring, one side of this spring is supported on the valve seat ring that is sitting on the valve piston, opposite side then is supported in the spring thrust supporting that constitutes the valve housing top, required down in off position sealing is by being contained in the plunger hole inner groovy, and realize at the O type ring that valve piston is crossed the radial hole that passes from its axial bore, it is characterized in that, at spring-leaf retainer with constitute inlet side, have between the guiding device (21) of plunger hole (20) and valve piston (10), load onto a middleware (12) that is tightened on the valve housing (2), it has a corresponding axial bore (16) and one sealed plunger movably in the hole, the sealing plunger seals the hole by an O type ring, one side is supported on the spring-leaf retainer (5), another side is supported on the valve piston (10), in middleware, in the transition region of valve piston/sealed plunger, have and draw from plunger hole (20) or axial bore (16), pass the big radially exit orifice (17,18) of middleware and valve housing.
2, by the pressure-limit valve of claim 1, it is characterized in that sealed plunger (11) by a kind of plastic bushing as teflon (28) with low friction factor around.
3, by the pressure-limit valve of claim 1, it is characterized in that on circumference, being uniform-distribution with 8 radially exit orifices (17,18).
4,, it is characterized in that middleware (12) has a screw thread (15) that is complementary with the screw thread of guiding device (21) and valve housing (2) by the pressure-limit valve of claim 1.
5, by the pressure-limit valve of claim 1, it is characterized in that sealed plunger (11) has a flange (30), valve piston (10) has an even surface in a side of adjoining with flange.
6, by the pressure-limit valve of claim 1, it is characterized in that the axial bore (25) of valve piston (10) and radial hole (23,24) and radially the liquid stream net sectional area of exit orifice (17, the 18) liquid that is equal to or greater than input pipeline flow net sectional area.
7, press the pressure-limit valve of claim 1 or 2, it is characterized in that valve piston (10) and sealed plunger (11) are designed to the monomer plunger, plunger hole (20) has enlarged, and can hold the sleeve pipe (37) that is equivalent to plastic bushing (28), vertical hole (25) of valve piston is arranged to make final position at the bottom of its hole near exit orifice (17 radially, 18) minimum point, and radial hole (23,24) is then near being provided with at the bottom of the hole in vertical hole (25).
8, press the pressure-limit valve of claim 1, it is characterized in that guiding device (21) can hold sealed plunger (11), valve piston (10) and exit orifice (17,18) radially, and be connected with valve housing (2) by the centering disk (33) that has internal and external screw thread (34,35).
9,, it is characterized in that spring thrust supporting (9) has closed exit orifice by the pressure-limit valve of claim 1.
10,, it is characterized in that middleware (12) and guiding device (21) make an element of construction by the pressure-limit valve of claim 1 or claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100477 CN1016212B (en) | 1988-02-01 | 1988-02-01 | Pressure limited valve with dry chamer including spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100477 CN1016212B (en) | 1988-02-01 | 1988-02-01 | Pressure limited valve with dry chamer including spring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1034781A CN1034781A (en) | 1989-08-16 |
| CN1016212B true CN1016212B (en) | 1992-04-08 |
Family
ID=4831371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88100477 Expired CN1016212B (en) | 1988-02-01 | 1988-02-01 | Pressure limited valve with dry chamer including spring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1016212B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101276729B (en) * | 2007-03-29 | 2010-06-02 | 株式会社Sts | Rectangular gate valve |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008034519A1 (en) * | 2006-09-18 | 2008-03-27 | Robert Bosch Gmbh | Valve arrangement for a hydrostatic machine, in particular for an axial piston machine |
| ITMI20120892A1 (en) * | 2012-05-23 | 2013-11-24 | Bosch Gmbh Robert | OVERFLOW VALVE AND FUEL INJECTION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE COMPROMISONING OF THAT TOO FULL VALVE, |
| DE102015205376A1 (en) * | 2015-03-25 | 2016-09-29 | Robert Bosch Gmbh | Pressure relief valve |
| CN113413225B (en) * | 2021-05-18 | 2023-07-28 | 李标 | Be used for esophagus cancer postoperative patient oral cavity belt cleaning device |
-
1988
- 1988-02-01 CN CN 88100477 patent/CN1016212B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101276729B (en) * | 2007-03-29 | 2010-06-02 | 株式会社Sts | Rectangular gate valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1034781A (en) | 1989-08-16 |
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