阅读说明：本技术 一种两级泄压直动式溢流阀 (A kind of two-stage pressure release direct-acting overflow valve ) 是由 王美娟 于 2019-08-20 设计创作，主要内容包括：本发明涉及精密仪器技术领域,且公开了一种两级泄压直动式溢流阀,包括阀体和调定手柄,所述调定手柄伸入阀体内的一端固定连接有顶撑盖,所述顶撑盖的另一侧设有两个同心圆环槽,所述顶撑盖的两个同心圆槽内分别设有二级调压弹簧和一级调压弹簧,所述二级调压弹簧的另一端固定连接有二级阀芯,所述二级阀芯的内部活动套接有阀杆。本发明通过在原二级阀芯内活动套接阀杆和一级阀芯,并由一级调压弹簧控制阀杆的调定压力,可将该溢流阀分为由一级调压弹簧调定的优先级压力、二级调压弹簧调定的二级压力,可使得二级调定压力以下的系统瞬时压力波动由一级阀芯优先打开泄压阀口的开度以小阀口泄压,降低系统瞬时压力波动的震动幅度。(The present invention relates to precision instrument technical fields, and disclose a kind of two-stage pressure release direct-acting overflow valve, including valve body and set up handle, the setting handle, which protrudes into the intracorporal one end of valve and is fixedly connected with, shores lid, the other side for shoring lid is set there are two concentric circles annular groove, second voltage regulation spring and level-one pressure spring are respectively equipped in two concentric grooves for shoring lid, the other end of the second voltage regulation spring is fixedly connected with second level spool, and the internal activity of the second level spool is socketed with valve rod.The present invention passes through in former secondary valve in-core pivot bush unit valve rod and level-one spool, and by the set pressure of level-one pressure spring control valve rod, the overflow valve can be divided into the preferential stage pressure set up by level-one pressure spring, the secondary pressure that second voltage regulation spring is set up, it may make second level set pressure system temporal pressure fluctuations below to open the aperture of pressure relief valve port preferentially by level-one spool with small valve port pressure release, reduce the vibration amplitude of system temporal pressure fluctuations.)

1. a kind of two-stage pressure release direct-acting overflow valve, including valve body (1) and setting handle (3), it is characterised in that: the setting hand One end that handle (3) protrudes into valve body (1), which is fixedly connected with, shores lid (4), the other side for shoring lid (4) set there are two with one heart Annular groove is respectively equipped with second voltage regulation spring (5) and level-one pressure spring (9) in two concentric grooves for shoring lid (4), The other end of the second voltage regulation spring (5) is fixedly connected with second level spool (6), the internal activity set of the second level spool (6) It is connected to valve rod (7), one end of the second level spool (6) is fixedly connected with hush panel (8), the other end of the second level spool (6) It is fixedly connected with the other end of level-one pressure spring (9), the external fixing sleeve of the valve rod (7) is connected to one-step valve core (10), institute The inside for stating second level spool (6) offers pressure relief valve port (11), the surface shape of the pressure relief valve port (11) and level-one spool (10) Shape is adapted, and the inner wall of the valve body (1) is fixedly installed with valve seat (12), the mesoporous of the valve seat (12) and second level spool (6) External surface shape be adapted.

2. a kind of two-stage pressure release direct-acting overflow valve according to claim 1, it is characterised in that: the level-one pressure spring (9) pressure for pressing valve rod (7) is identical as second voltage regulation spring (5) the press pressure of second level spool (6).

3. a kind of two-stage pressure release direct-acting overflow valve according to claim 1, it is characterised in that: the valve rod (7) and top When one side contacts of support lid (4), the side of the lucky hush panel (8) and a side contacts of second level spool (6).

4. a kind of two-stage pressure release direct-acting overflow valve according to claim 1, it is characterised in that: the pressure relief valve port (11) It is identical as the tapered surface gradient of valve seat (12).

Technical field

The present invention relates to precision instrument technical field, specially a kind of two-stage pressure release direct-acting overflow valve.

Background technique

Direct-acting overflow valve is mainly made of valve body, spool, pressure spring and pressure regulating screw (or handle).In normality Under, spool is tightly attached on valve seat under the action of pressure spring, and oil inlet and oil outlet are that obstructed (i.e. overflow valve is normally closed Type).

When by overflow valve access system, hydraulic oil just generates an active force, the direction of power and spring force on spool It is contrary, when inlet pressure be lower than overflow valve set pressure when, then spool is not turned on, and inlet pressure is main at this time Depending on outer load.When oil liquid active force is greater than spring force, spool is opened, and oil liquid flows back to fuel tank from overflow port.Spring force with The increase of the amount of opening of overflow valve and increase, until balance each other with hydraulic action.When overflow valve starts overflow, oil inlet Pressure at mouthful is basically stable on setting, to play the role of overflow pressure stabilizing.Pass through the pre- of pressure regulating screw adjustment spring Decrement can set up the size of overflow valve oil pressure relief value.

Since the pressure of direct-acting overflow valve is mainly provided by spring rate, hydraulic coupling setting is higher, then spring rate is got over Greatly, since valve port area is larger, when valve port opening is slightly changed, then cause biggish pressure oscillation, cause system hydraulic coupling Shakiness, so direct moving type hydraulic valve with its sensitivity due to pilot operated compound relief valve, be usually used in safety valve, in low-pressure low flow, this Application proposes a kind of direct-acting overflow valve, it is intended to solve the overflow valve stability problem under system pressure fluctuation.

Summary of the invention

Existing insufficient in use for the existing direct-acting overflow valve proposed in background technique, the present invention provides A kind of two-stage pressure release direct-acting overflow valve has the advantages of second level pressure release movement ensures the stationarity of overflow pressure relief, solves The problems mentioned above in the background art.

The invention provides the following technical scheme: a kind of two-stage pressure release direct-acting overflow valve, including valve body and setting handle, institute State and set up handle and protrude into the intracorporal one end of valve and be fixedly connected with and shore lid, the other side for shoring lid set there are two concentric loop Slot is respectively equipped with second voltage regulation spring and level-one pressure spring, the second voltage regulation in two concentric grooves for shoring lid The other end of spring is fixedly connected with second level spool, and the internal activity of the second level spool is socketed with valve rod, the second level spool One end be fixedly connected with hush panel, the other end of the second level spool is fixedly connected with the other end of level-one pressure spring, institute The external fixing sleeve for stating valve rod is connected to one-step valve core, and the inside of the second level spool offers pressure relief valve port, the pressure relief valve port It is adapted with the surface shape of level-one spool, the inner wall of the valve body is fixedly installed with valve seat, the mesoporous and second level of the valve seat The external surface shape of spool is adapted.

Preferably, the pressure of the pressure of the level-one pressure spring press valve rod and second voltage regulation spring press second level spool It is identical.

Preferably, the valve rod with shore lid a side contacts when, the side of the lucky hush panel and second level spool One side contacts.

Preferably, the pressure relief valve port is identical as the tapered surface gradient of valve seat.

The present invention have it is following the utility model has the advantages that

1, the present invention in former secondary valve in-core pivot bush unit valve rod and level-one spool, and by level-one pressure spring by controlling The overflow valve can be divided into preferential stage pressure, the second voltage regulation spring tune set up by level-one pressure spring by the set pressure of valve rod Fixed secondary pressure may make second level set pressure system temporal pressure fluctuations below preferentially to open relief valve by level-one spool The aperture of mouth reduces the vibration amplitude of system temporal pressure fluctuations with small valve port pressure release.

2, the present invention passes through the combination aperture of pressure relief valve port and valve seat, and system may make to encounter bigger hydraulic fluctuation When, bigger aperture can be instantaneously opened, so that system restores pressure balance, the stabilization of safeguards system in the shortest time Property.

Detailed description of the invention

Fig. 1 is schematic structural view of the invention.

In figure: 1, valve body；2, valve deck；3, handle is set up；4, lid is shored；5, second voltage regulation spring；6, second level spool；7, valve Bar；8, hush panel；9, level-one pressure spring；10, level-one spool；11, pressure relief valve port；12, valve seat；13, oil outlet.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

Referring to Fig. 1, a kind of two-stage pressure release direct-acting overflow valve, including valve body 1, thread seal are connected to 1 end of valve body Valve deck 2, thread seal is connected to the setting handle 3 inside valve deck 2, sets up one end that handle 3 protrudes into valve body 1 and be fixedly connected Lid 4 is shored, is set in the other side for shoring lid 4 there are two concentric circles annular groove, wherein second voltage regulation spring 5 is socketed in outer groove, it is interior Slot is socketed with level-one pressure spring 9, and the other end of second voltage regulation spring 5 is fixedly connected with second level spool 6, second level spool 6 it is interior Portion's movable sleeve is connected to valve rod 7, and one end of second level spool 6 is fixedly connected with hush panel 8, the other end and level-one tune of second level spool 6 The other end of pressing spring 9 is fixedly connected, and the external fixing sleeve of valve rod 7 is connected to one-step valve core 10, and the inside of second level spool 6 offers Pressure relief valve port 11, pressure relief valve port 11 are adapted with the surface shape of level-one spool 10, are fixedly installed with valve seat in the inner wall of valve body 1 12, the mesoporous of valve seat 12 is adapted with the external surface shape of second level spool 6, is opened up in the inner wall of valve body 1 there are two oil outlet 13.

It is now assumed that hydraulic coupling is gradually increasing in system used in the present invention, the course of work is described as follows:

It is identical with the set pressure of second voltage regulation spring 5 by the set pressure of level-one pressure spring 9,

When hydraulic coupling is under set pressure, the present invention is failure to actuate；

When hydraulic coupling is higher than the pressure set up, the active area due to opening second level spool 6 reduces pressure relief valve port 11 Port area, so level-one spool 10 is preferentially lifted off in pressure relief valve port 11 by hydraulic oil, hydraulic oil leads to out of pressure relief valve port 11 It crosses, then flows back to mailbox from oil outlet 13；

When hydraulic coupling is persistently higher than set pressure, it will push level-one spool 10 and leave pressure relief valve port 11, level-one tune completely Pressing spring 9 reaches most compressed state, at this point, the end of valve rod 7 is adjacent to the side contacts for shoring lid 4, the side of hush panel 8 By an end closure of pressure relief valve port 11, hydraulic coupling will push hush panel 8 and 6 synchronizing moving of second level spool, and compress second voltage regulation bullet Spring 5 opens the opening of valve seat 12, continues with big flow valve port pressure release；

Particularly, when system instantaneous pressure is more higher than set pressure, system can act on second level spool 6 and push valve seat 12 open Valve port hereafter also will continue to effect level-one spool 10 and push the valve port of pressure relief valve port 11 open, so that valve seat 12 is not reaching most Before big valve port, expand the aperture of instantaneous valve port by pressure relief valve port 11, thus, can safeguards system deal with the stabilization of instantaneous high pressure power Property.

Wherein, the spring rate of second voltage regulation spring 5 is calculated by predetermined hydraulic pressure power P multiplied by the end area of second level spool 6, and The spring rate of level-one pressure spring 9 is determined by predetermined hydraulic pressure power P multiplied by the end area of level-one spool 10.

Wherein, to ensure that second level sets up the design stability of pressure release, one end of valve rod 7 connects with the side bottom plate for shoring lid 4 When touching, the side of hush panel 8 just with a side contacts of second level spool 6.

Wherein, additional caused by preventing because of the successive impact turbulent of high pressure liquid stream to ensure that the liquid flow path direction of two-stage pressure release is consistent Vibration, the tapered surface gradient of pressure relief valve port 11 and valve seat 12 is set identical.

It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment Intrinsic element.

It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.