CN207920996U - Control valve and overflow valve - Google Patents

Abstract

The utility model is related to a kind of control valve and overflow valve, the overflow valve has valve body, sleeve, guide's valve portion, main valve portion and containment member.Valve body is installed on the shell of control valve and there is sleeve to be inserted into hole for inside, the base end part of sleeve is inserted into sleeve and is inserted into hole and has pilot chamber in sleeve inner, guide's valve portion has guide's valve seat that the pilot valve that can be moved forward and backward in the valve body and pilot valve can take a seat, guide's valve portion valve opening when the indoor pressure of guide is higher than authorized pressure, main valve portion has the main valve plug that can be moved forward and backward in the sleeve and is formed in the main valve seat that the sleeve and the main core body can take a seat, main valve portion valve opening when generating pressure difference between the pilot chamber inside and outside, containment member is set to the sleeve interior surface, it prevents from going out working solution from the pilot chamber internal leakage, it is surprisingly low to prevent the indoor pressure of guide, the unexpected unfavorable condition for being led to reservoir port of a part of working solution in hydraulic cylinder port.

Description

Control valve and overflow valve

Technical field

The utility model is related to control valve used in hydraulic mechanism and overflow valves.

Background technology

Always, for the hydraulic pressure control in the hydraulic circuits such as the control of maximum pressure of realizing the hydraulic cylinder port in control valve System uses always overflow valve (referring for example to patent document 1).

This overflow valve usually has valve body a6, sleeve a7, guide's valve portion a5 and main valve portion a4 as shown in Figure 4.The valve Body a6 is installed on the shell a1 of control valve and has described in the base end part insertion of sleeve insertion hole a6x, the sleeve a7 in inside Sleeve is inserted into the a6x of hole and in the internal spring housing a7x having as pilot chamber, guide's valve portion a5 is utilized can be in institute State the pilot valve a10 moved forward and backward in valve body a6 and the guide with the pilot valve a10 guide's valve seat a11 that can be taken a seat Valve seat member a12 is formed, valve opening when pressure of the guide's valve portion a5 in the spring housing a7x is higher than defined pressure, described Main valve portion a4 has the main valve plug a8 that can be moved forward and backward in the sleeve a7 and is formed in the sleeve a7 and the main valve The main valve seat a9 that core a8 can take a seat, main valve seat a9 are opened between outside when generation pressure difference inside the spring housing a7x Valve.On this basis, containment member a17 is configured between the sleeve a7 and guide's valve seat member a12, can prevent from coming from The leakage of working solution in spring housing a7x.

More specifically, overflow valve a3 shown in Fig. 4, be in order to by the pressure of hydraulic cylinder port a1c be controlled in specified value with It uses down.Hydraulic pressure in hydraulic cylinder port a1c is led to the bullet by being set to the hole (Orifice) of the main valve plug a8 Spring room a7x.When pressure in hydraulic cylinder port a1c is specified value or less, compared with the power of the hydraulic pressure in hydraulic cylinder port a1c, The power bigger that the 2nd forcing unit a16 for the pilot valve a10 to be placed in guide's valve seat a11 is generated, pilot valve A10 keeps the state in guide's valve seat a11.At this moment, there is no hydraulic pressure difference between outside inside the spring housing a7x, therefore The thrust of the 1st forcing unit a15 configured in the spring housing a7x makes main valve plug a8 also keep the shape for being seated at main valve seat a9 State.Once the pressure in hydraulic cylinder port a1c is more than specified value, the power of the hydraulic pressure in hydraulic cylinder port a1c defeats the 2nd force The power that unit a16 is generated, pilot valve a10 leave guide valve seat a11, and the working solution in spring housing a7x is led to reservoir port (タ Application ク ポ ー ト), therefore generate hydraulic pressure difference between the spring housing a7x and hydraulic cylinder port a1c.At this moment, main valve plug a8 leaves main valve A part for working solution in seat a9, hydraulic cylinder port a1c is led to reservoir port.

Citation

Patent document 1：Japanese Unexamined Patent Publication 2000-74003 bulletins

Utility model content

The utility model project to be solved

But due to fluid force etc., when sleeve a7 is rotated to the direction for leaving valve body a6, it may occur however that as described below unfavorable Situation.

That is, when sleeve a7 makees larger mobile to the direction for leaving valve body a6, at least part of containment member a17 It is not the state seized on both sides by the arms by sleeve a7 and guide's valve seat member a12, losing prevents treatment fluid flow in spring housing a7x toward spring Function outside the a7x of room.At this moment, no matter whether the hydraulic pressure in hydraulic cylinder port a1c is reduced to specified value hereinafter, working solution is all from bullet Reservoir port is flowed in the a7x of spring room, pressure difference occurs between stopping up a7x due to hydraulic cylinder port a1c and spring, so main valve plug a8 leaves A part for working solution in main valve seat a9, hydraulic cylinder port a1c is directed into reservoir port between being not intended to.At this moment, it may occur that load The rough sledding such as decline between the objective table of weight is not intended to.

Problem as described above is not limited to for telescopic screw to be fixed on the structure of valve body, can also betide the base of sleeve End is inserted into valve body and the top end part of valve body and sleeve is inserted into all overflow valves of the structure of mounting object.

The utility model is conceived to problems described above, for the purpose of existing as solving the problems, such as.

Solve the means of project

To solve project described above, the control valve of the utility model has composition as described below.That is the utility model Control valve has the internal shell with hydraulic circuit and is set in the hydraulic circuit and is installed on overflowing for the shell Valve is flowed, the overflow valve has：Valve body in inside there is sleeve to be inserted into hole；The base end part of sleeve, the sleeve is inserted into institute It states sleeve and is inserted into hole, the inside of the sleeve has pilot chamber；Guide's valve portion, having can move forward and backward in the valve body Pilot valve and the guide's valve seat that can take a seat of the pilot valve, when the indoor pressure of the guide is higher than authorized pressure Guide's valve portion valve opening；Main valve portion has the main valve plug that can be moved forward and backward in the sleeve and is formed in the sleeve And the main valve seat that the main valve plug can take a seat, the pilot chamber it is inside and outside between produce pressure difference when the master Valve portion valve opening；And containment member, it is set to the sleeve interior surface, is gone to work from the pilot chamber internal leakage for preventing Make liquid, the sleeve has anti-delinking part, carries out the anticreep of the sleeve by the way that the anti-delinking part is abutted with the shell.

Also, to solve the above technical problems, the overflow valve of the utility model has structure as described below.That is the utility model Overflow valve has：Valve body in inside there is sleeve to be inserted into hole；Sleeve, the base end part of the sleeve are inserted into the sleeve and insert Enter hole, the inside of the sleeve has pilot chamber；Guide's valve portion has the pilot valve that can be moved forward and backward in the valve body Guide's valve seat that core and the pilot valve can take a seat, the guide when the indoor pressure of the guide is higher than authorized pressure Valve portion valve opening；Main valve portion has the main valve plug that can be moved forward and backward in the sleeve and is formed in the sleeve and the master The main valve seat that spool can take a seat, main valve portion valve opening when producing pressure difference between outside inside the pilot chamber； And containment member, it is set to the sleeve interior surface, goes out working solution from the pilot chamber internal leakage for preventing, in institute It states sleeve top end part and has anti-delinking part, the sleeve is carried out by the anti-delinking part is abutted with the object for installing the overflow valve Anticreep.

If having these structures, once sleeve is moved to the direction for leaving valve body, by means of the installations such as sleeve and shell The abutting of the object of overflow valve can limit sleeve and further move, and prevent containment member from releasing sealing.

Also, the suitable form as the anti-delinking part, it can be cited for example that, by making near a position of the sleeve The position of nearly tip side is more prominent to the direction orthogonal with axis direction and is arranged raised.

And as an example for the form that sleeve is reliably mounted on to valve body, it can be cited for example that, it is described to be formed in The external screw thread of sleeve screws the state on the internal thread for being formed in the valve body, and the hub being mounted is in the valve body.

The effect of utility model

If using the utility model, it can prevent the indoor pressure of guide from unintentionally declining and the work in hydraulic cylinder port Make liquid a part be led to unintentionally reservoir port failure generation.

Description of the drawings

Fig. 1 is the median vertical section figure of the control valve of one implementation form of the utility model.

Fig. 2 is the median vertical section figure for the overflow valve for indicating the implementation form.

Fig. 3 is the enlarged drawing of the region x of Fig. 2.

Fig. 4 is the median vertical section figure of the control valve comprising existing overflow valve.

Specific implementation mode

One implementation form of the utility model is illustrated referring to Fig. 1~Fig. 3.

As shown in Figure 1, the control valve C of this implementation form has：Shell 1；It can be in the spool bore 1x for being set to the shell 1 The sliding spool 2 of interior sliding；And it is installed on the overflow valve 3 of the shell 1.

The shell 1 has hydraulic circuit inside it.More specifically, the inside of shell 1 has：From pump (not shown) The supply source of equal working solutions receives the working solution supply road 1a of the supply of working solution；It is set to the check-valves of working solution supply road 1a 1b；It is connected to the 1st hydraulic cylinder port 1c of the sides cylinder chamber TS1 of the tilt cylinder TS as actuator, is connected to and inclines It is connected to the 2nd hydraulic cylinder port 1d of the sides piston TS2 of hydraulic cylinder TS and with the fuel tank (not shown) of storage working solution Outlet 1e.

As described above, the sliding spool 2 can slide in spool bore 1x, can select neutral position shown in Fig. 2, from It moves the obliquity of specified amount to the right side of Fig. 2 and is moved from the neutral position to the left side of Fig. 2 and advise in the neutral position Quantitative position of standing up.In the neutral position, the working solution supply road 1a and described 1st and the 2nd hydraulic cylinder port 1c, 1d it Between and the outlet 1e and described 1st and the 2nd hydraulic cylinder port 1c, 1d between be all truncated.In the obliquity, institute Working solution supply road 1a and the 1st hydraulic cylinder port 1c and outlet 1e and the 2nd hydraulic cylinder port 1c is stated respectively to connect It is logical.Moreover, in the position of standing up, the outlet 1e and the 1st hydraulic cylinder port 1c and the working solution supply road 1a It is respectively communicated with the 2nd hydraulic cylinder port 1c.

The overflow valve 3 is arranged in the overflow valve mounting hole 1f being connected to described hydraulic cylinder port 1c, 1d, has main valve Portion 4 and guide's valve portion 5.Also, the overflow valve 3 can be adjusted so that the pressure in described hydraulic cylinder port 1c, 1d is not higher than rule Constant-pressure.The concrete structure of the overflow valve 3 is illustrated referring to Fig. 2 and Fig. 3.In addition, in Fig. 2 and Fig. 3, there is shown The mounting structure that overflow valve 3 is installed on the 1st hydraulic cylinder port 1c, the mounting structure that overflow valve 3 is installed on the 2nd hydraulic cylinder port 1d Also identical.

As shown in Fig. 2, the overflow valve 3 has valve body 6, sleeve 7, the main valve portion 4 and guide's valve portion 5.Institute Stating valve body 6 in inside there is sleeve to be inserted into hole 6x, and the base end part of the sleeve 7 is inserted into the sleeve and is inserted into hole 6x and has in inside There are the spring housing 7x as pilot chamber, the main valve portion 4 to have the main valve seat 9 that main valve plug 8 and the main valve plug 8 can take a seat, The guide's valve seat structure for guide's valve seat 11 that guide's valve portion 5 can take a seat using pilot valve 10 and with the pilot valve 10 Part 12 and formed.

As shown in said Fig. 2, the valve body 6 has inside its base end side accommodates the use of the pilot valve 10 in which can retreat Pilot valve receiving space 6a, and have inside the tip side described in the position for the base end side for accommodating the sleeve 7 Sleeve is inserted into hole 6x.Interior spiral shell of the inner surface formation of the base end side of hole 6x for screwing the sleeve 7 is inserted into the sleeve On the other hand the external screw thread 6c for being screwed with internal thread hole 1g is arranged in the top end part outer surface of the valve body 6 in groove 6b, should Internal thread hole 1g is formed on the inner surface of the overflow valve mounting hole 1f of the shell 1.

As shown in said Fig. 2, the sleeve 7 is cylindrical member, the sleeve 7 top end part i.e. towards hydraulic cylinder port 1c, The end of the side of 1d has the treatment fluid flow entrance 7a that be connected to described hydraulic cylinder port 1c, 1d, and on side with The working solution outlet 7b of the outlet 1e connections.External screw thread 7c is set in the base end part of the sleeve 7, to make the external screw thread The internal thread groove 6b of 7c and the valve body 6 are screwed, and the sleeve 7 is thus tightened against the valve body 6.I.e. with external screw thread 7c It is tightened against the state of the internal thread groove 6b, which is installed on the valve body 6.Also, 7 inside of sleeve is described in composition The spring housing 7x that the main poppet valve 14 of the main valve plug 8 of main valve portion 4 can slide.Institute is formed in the upstream side ora terminalis of spring housing 7x State main valve seat 9.

As described above, as shown in said Fig. 2, the main valve portion 4 can be taken a seat using main valve plug 8 and the main valve plug 8 and It is formed in the formation of main valve seat 9 of the sleeve 7.When forming pressure difference between the inside and outside of the spring housing 7x, the master The main valve plug 8 of valve portion 4 leaves the main valve seat 9 and becomes valve opening state.The main valve plug 8 be by intermediate piston 13 and Inside accommodates the component that the main poppet valve 14 of the intermediate piston 13 is constituted, and the inside of the intermediate piston 13 has towards the master The back pressure chamber 13a of the opposite side opening of 9 side of valve seat, the main valve plug 8 have the connection back pressure chamber 13a and the hydraulic pressure The hole 8x of cylinder mouth 1c, 1d.Then, which may be selected the closed valve state that the main poppet valve 14 is seated at the main valve seat 9 Or the main poppet valve 14 leaves the valve opening state of the main valve seat 9.More specifically, in the intermediate piston of the main valve plug 8 Between 13 and guide's valve seat member 12, setting makes the i.e. described intermediate piston 13 of the main valve plug 8 and main poppet valve 14 to institute State forcing unit, i.e. the 1st spring 15 of the force of main valve seat 9.Then, it is valve opening state, the spring housing in guide's valve portion 5 When differential pressure occurs between in 7x and in described hydraulic cylinder port 1c, 1d, win the spring because the differential pressure acts on fighting with all might for main valve plug 8 15 elastic force, the main valve portion 4 become valve opening state.

As described above, again as shown in said Fig. 2, guide's valve portion 5 utilizes pilot valve 10 and guide's valve seat member 12 And it is formed.The pilot valve 10 can retreat in the pilot valve receiving space 6a of the valve body 6, guide's valve seat structure Part 12 has guide's valve seat 11 that the pilot valve 10 can take a seat.Pressure in the spring housing 7x is higher than authorized pressure When, the pilot valve 10 of guide's valve portion 5 is left from guide's valve seat 11 and becomes valve opening state.The pilot valve 10 have spool main body 10a and guide part 10b, the spool main body 10a in more smaller to the sides hydraulic cylinder port 1c, 1d diameter Substantially coniform, the guide part 10b is from the spool main body 10a along the opposite side towards the sides described hydraulic cylinder port 1c, 1d Extend and is slid in the pilot valve receiving space 6a.On the other hand, guide's valve seat member 12 has flange part 12a and mounting portion 12b, the flange part 12a are disposed between the sleeve 7 and the valve body 6, the mounting portion 12b from this Flange part 12a extends to the sides described hydraulic cylinder port 1c, 1d and is disposed in inside the sleeve 7, and guide's valve seat structure Part 12 has guide's valve seat 11 in the end of the opposite side towards the sides hydraulic cylinder port 1c, 1d of the mounting portion 12b.In It is that guide's valve portion 5 may be selected the pilot valve 10 and be seated at the closed valve state of guide's valve seat 11 or the pilot valve The valve opening state that core 10 leaves from guide's valve seat 11.More specifically, the spool main body 10a of the pilot valve 10 with Between the valve body 6, setting makes forcing unit i.e. the 2nd spring 16 that the pilot valve 10 exerts a force to guide's valve seat 11. When being introduced into the hydraulic pressure in spring housing 7x higher than specified value from the hole 8x of described hydraulic cylinder port 1c, 1d through the main valve plug 8, because The hydraulic action wins the elastic force of the 2nd spring 16 in fighting with all might for pilot valve 10, which becomes valve opening state.

Then, to prevent from going out working solution from the spring housing 7x internal leakages, between the valve body 6 and the sleeve 7, more Strictly, between guide's valve seat member 12 and the sleeve 7, configured with the containment member 17 using O-ring.

Moreover, in this embodiment, as shown in described Fig. 2, Fig. 3, the top end part of the sleeve 7 has anti-delinking part 18.

The anti-delinking part 18 is the portion that the enlarged-diameter at the position of the base end side by making the sleeve 7 obtains neighbour nearly tip side Position is big, in other words, the anti-delinking part 18 be nearly tip side near the position of the base end side by making the sleeve 7 position more to The protrusion that the direction orthogonal with axis direction is prominent and is arranged.

If it is such composition, even because of Fluid pressure etc. so that sleeve 7 is towards the loosened screw relative to valve body 6 Direction rotate, to the direction of the arrow Y of described Fig. 3, i.e. from valve body 6 extract direction movement in the case of, also such as the figure Shown in imaginary line, by means of the abutting of the anti-delinking part 18 and the shell 1, the further movement of sleeve 7 is limited.

To if using the composition of described implementation form, since the anti-delinking part 18 can be utilized to limit the set Cylinder 7 is moved to from the direction that the valve body 6 is detached from, and can prevent from making to the direction for being detached from valve body 6 due to the sleeve 7 larger Status releasing mobile and that the containment member 17 will be clipped between the sleeve 7 and guide's valve seat member 12, Neng Goufang The unfavorable condition that working solution is leaked out from spring housing 7x only occurs.

Also, due to being tightened on the internal thread groove 6b formed on the valve body 6 with the external screw thread 7c formed on the sleeve 7 State the sleeve 7 is installed on the valve body 6, therefore the sleeve 7 can be reliably mounted on the valve body 6.

In addition, the utility model is not limited to implementation form described above.

It constitutes, can also be adopted with main poppet valve for example, main valve portion is not limited to the intermediate piston as the implementation form With these components to be formed to integrated main valve portion, in other words, it can also use and back pressure chamber is set simultaneously in the inside of main poppet valve The structure in the hole for making the back pressure chamber be connected to hydraulic cylinder port is set.

Also, guide's valve seat member about guide's valve portion, as long as guide's valve seat is fixed and had relative to valve body, how Shape and structure can.

In addition, in the implementation form, connect near the position by making sleeve the position of tip side more to axle center The orthogonal direction in direction is prominent and forms anti-delinking part, as long as but anti-delinking part can prevent sleeve from deviating from from valve body, no matter It is which type of shape can.For example, it is contemplated that using make the outer diameter of sleeve more toward base end side, i.e. close to the side of valve body it is bigger Shape, sleeve to leave valve body direction move when, a position of the outer surface of the sleeve can abut to the form of shell. Anti-delinking part can not be set in shell side in sleeve.

Moreover, the installation form about sleeve on valve body, in the implementation form, in order to more simply and reliablely Sleeve is fixed on valve body, sleeve is screwed and is fixed on valve body, but can also sleeve be simply for example inserted into valve body.

Moreover, the composition of the overflow valve of the utility model, regulation is controlled in not only for by the pressure in hydraulic cylinder port Value is hereinafter, being set in hydraulic circuit and the pressure in somewhere in hydraulic circuit being controlled in specified value or less and is arranged all excessive Stream valve can be applicable in.

In addition, can have various changes in the range of not damaging the purport of the utility model.

Symbol description

C ... control valves

1 ... shell

3 ... overflow valves

4 ... main valve portions

5 ... guide's valve portions

6 ... valve bodies

7 ... sleeves

7x ... pilot chambers (spring housing)

8 ... main valve plugs

9 ... main valve seats

10 ... pilot valves

11 ... guide's valve seats

17 ... containment members

18 ... anti-delinking parts.

Claims (4)

1. a kind of control valve has the internal shell with hydraulic circuit and is set in the hydraulic circuit and installs In the overflow valve of the shell, the control valve is characterized in that,

The overflow valve has：

Valve body in inside there is sleeve to be inserted into hole；

Sleeve, the base end part of the sleeve are inserted into the sleeve and are inserted into hole, and the inside of the sleeve has pilot chamber；

Guide's valve portion, has a pilot valve that can be moved forward and backward in the valve body and the pilot valve can take a seat Guide's valve seat, guide's valve portion valve opening when the indoor pressure of the guide is higher than authorized pressure；

Main valve portion has the main valve plug that can be moved forward and backward in the sleeve and is formed in the sleeve and the main valve plug The main valve seat that can be taken a seat, the pilot chamber it is inside and outside between produce pressure difference when the main valve portion valve opening；With And

Containment member is set to the sleeve interior surface, goes out working solution from the pilot chamber internal leakage for preventing,

The sleeve has anti-delinking part, carries out the anticreep of the sleeve by the way that the anti-delinking part is abutted with the shell.

2. control valve according to claim 1, which is characterized in that

The anti-delinking part is by making the position of nearly tip side near a position of the sleeve more to orthogonal with axis direction The protrusion that direction is prominent and is arranged.

3. control valve according to claim 1 or 2, which is characterized in that

External screw thread to be formed in the sleeve screws the state on the internal thread for being formed in the valve body, and the sleeve is pacified Loaded on the valve body.

4. a kind of overflow valve, which is characterized in that have：

Valve body in inside there is sleeve to be inserted into hole；

Sleeve, the base end part of the sleeve are inserted into the sleeve and are inserted into hole, and the inside of the sleeve has pilot chamber；

Guide's valve portion, has a pilot valve that can be moved forward and backward in the valve body and the pilot valve can take a seat Guide's valve seat, guide's valve portion valve opening when the indoor pressure of the guide is higher than authorized pressure；

Main valve portion has the main valve plug that can be moved forward and backward in the sleeve and is formed in the sleeve and the main valve plug The main valve seat that can be taken a seat, main valve portion valve opening when producing pressure difference between outside inside the pilot chamber；And

Containment member is set to the sleeve interior surface, goes out working solution from the pilot chamber internal leakage for preventing,

Have anti-delinking part in the sleeve top end part, is carried out by the anti-delinking part is abutted with the object for installing the overflow valve The anticreep of the sleeve.