KR101546607B1

KR101546607B1 - Relief valve apparatus

Info

Publication number: KR101546607B1
Application number: KR1020140016357A
Authority: KR
Inventors: 임효성; 한치우
Original assignee: 주식회사 두산
Priority date: 2014-02-13
Filing date: 2014-02-13
Publication date: 2015-08-21

Abstract

A relief valve device according to an embodiment of the present invention includes a relief valve device including an inlet through which a fluid flows and a discharge port through which a part of the fluid is discharged, A plunger having a body, a piston slidably received in the valve body, the plunger having a sub passage formed therein, and a plunger passage for guiding part or all of the fluid introduced from the inlet toward the piston, An elastic member provided between an outer circumferential surface of the plunger and an inner circumferential surface of the valve body to provide an elastic force to the plunger, and an elastic member disposed between the outer circumferential surface of the piston and the valve And the piston is provided between the inner circumferential surface of the body Description of fading and, when supplied with a second fluid passage in said piston and a control plug to press the elastic member.

Description

[0001] RELIEF VALVE APPARATUS [0002]

An embodiment of the present invention relates to a valve apparatus, and more particularly, to a relief valve apparatus.

In general, a relief valve device refers to a valve that discharges part or all of the fluid when the set pressure is reached, thereby maintaining the pressure in the circuit below the set value.

Therefore, the relief valve device is installed so as to maintain the pressure in the circuit below the set pressure.

Such a relief valve device is opened and closed by the elastic force of the elastic body and the fluid pressure difference in the circuit.

However, when such a relief valve device is used repeatedly, abrasion occurs due to repetitive friction between the plunger and the plunger seat, making it difficult to maintain the closing force to close the inlet.

In addition, there is a problem that the life and responsiveness of the relief valve device is deteriorated by abrasion between the plunger and the plunger sheet.

An embodiment of the present invention provides a relief valve device capable of effectively pressing an elastic member.

According to an embodiment of the present invention, a relief valve device includes a valve body including an inlet through which a fluid flows and a discharge opening through which a part of the fluid is discharged, and a remaining portion of the fluid is introduced; A piston having a sub passage formed therein and a plunger flow path for guiding part or all of the fluid introduced from the inlet to the piston, wherein one side selectively communicates the inlet with the discharge port and the other side is inserted into the piston An elastic member provided between an outer circumferential surface of the plunger and an inner circumferential surface of the valve body and providing an elastic force to the plunger, and an elastic member provided between an outer circumferential surface of the piston and an inner circumferential surface of the valve body, And the auxiliary passage of the piston When supplied to the fluid and a control plug to press the elastic member.

Further, the relief valve device may further include a spring seat installed between one side of the regulating plug and the resilient member, and the regulating plug includes an auxiliary plug for guiding the supply of the fluid introduced through the auxiliary passage of the piston, A plug chamber which is opposed to the spring seat and is capable of reserving the fluid supplied from the auxiliary plug flow channel, and a fluid chamber provided between the auxiliary plug flow channel and the plug chamber, And a check valve unit for supplying the check valve unit in one direction.

Further, the auxiliary passage of the piston may be opened or closed according to the position of the plunger.

Further, the adjustment plug further includes a plug seat installed in the plug chamber, and the plug seat presses the spring sheet by the pressure of the fluid stored in the plug chamber.

According to the embodiment of the present invention, the relief valve device can effectively press the elastic member, thereby improving the life and responsiveness of the relief valve device.

1 is a cross-sectional view of a relief valve device according to an embodiment of the present invention.
Figs. 2 to 4 are sectional views showing the operation state of Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive. And to the same structural elements or parts appearing in more than one drawing, the same reference numerals are used to denote similar features.

The embodiments of the present invention specifically illustrate ideal embodiments of the present invention. As a result, various variations of the illustration are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture.

Hereinafter, a relief valve device 101 according to an embodiment of the present invention will be described with reference to FIG.

1, a relief valve apparatus 101 according to an embodiment of the present invention includes a valve body 100 having an inlet 110 and a discharge port 120, a first chamber 300, A plunger 500 having a plunger flow path 510, an elastic member 600, and an adjustment plug 700. The piston 200 is provided with a first chamber 400 and a second chamber 400,

In the valve body 100, an inlet 110 and a discharge port 120 are formed. The inlet 110 is formed by opening one end of the valve body 100.

Specifically, the relief valve apparatus 101 is installed when it is desired to keep the pressure in the hydraulic circuit below the set pressure. When the fluid pressure in the circuit is equal to or higher than the set pressure, the fluid flows into the inlet 110 formed in the valve body 100 Can be introduced.

For example, the relief valve apparatus 101 of the present invention is installed in a hydraulic circuit used for a swing motor or a traveling motor of a vehicle for a construction machine, and can control the hydraulic pressure on the hydraulic circuit to a set pressure or less.

In addition, the inlet 110 may be formed at one end of the valve body 100 in the longitudinal direction.

For example, the valve body 100 may have a circular cross-section whose interior is hollow, and may be of a cylindrical shape elongated in one direction.

Specifically, the relief valve device 101 may further include a plunger sheet 10.

The plunger seat 10 may be installed at an inlet 110 formed in the valve body 100 and may be in contact with the plunger 500.

The discharge port 120 guides part of the fluid introduced into the inlet 110 to be discharged to the outside of the valve body 100.

Specifically, the fluid that has passed through the discharge port 120 can be discharged to a tank of a hydraulic device (not shown).

That is, when the fluid pressure in the circuit is equal to or higher than the set pressure, the fluid flows into the inlet 110 of the valve body 100 and a part of the fluid is discharged to the discharge port 120 and the discharge port 120 of the fluid flowing into the inlet 110 The remaining fluid can be introduced into the valve body 100.

The fluid introduced into the valve body 100 may provide power to slide the piston 200 and the plunger 500.

The piston 200 is accommodated in the valve body 100 and can be operated by fluid introduced into the valve body 100.

In addition, the piston 200 may partition the first chamber 300 and the second chamber 400 within the valve body 100.

The first chamber 300 and the second chamber 400 are partitioned by the piston 200 and can store the fluid introduced into the valve body 100.

Specifically, the first chamber 300 is formed between the inner circumferential surface of the piston 200 and the other side of the plunger 500. In addition, the first chamber 300 can hold the fluid that has passed through the plunger flow path 510.

A communication hole 210 is formed at one side of the piston 200. Specifically, the communication hole 210 may be formed so that the fluid stored in the first chamber 300 and the second chamber 400 can communicate with each other.

That is, the communication hole 210 may be formed on one side of the piston 200 facing the first chamber 300 and the second chamber 400.

The plunger 500 is received in the valve body 100 and is slid by the fluid flowing into the valve body 100. In addition, the plunger 500 opens and closes the inlet 110 to selectively communicate the inlet 110 and the outlet 120 with each other.

Specifically, the plunger 500 is slid in the valve body 100 by the pressure of the fluid flowing into the inlet 110, and the inlet 110 and the outlet 120 are communicated with each other by the sliding movement of the plunger 500 A part of the fluid introduced from the inlet 110 can be discharged to the discharge port 120. [

In addition, the plunger 500 may have a plunger flow path 510 formed therein. Specifically, the plunger channel 510 may be formed along the longitudinal direction of the plunger 500, and may guide some or all of the fluid introduced from the inlet 110 to the first chamber 300 to be stored therein .

In addition, the plunger 500 may further include a contracting portion 511. [ The contraction portion 511 is formed on the plunger flow path 510 adjacent to the discharge port 120 and has a diameter narrower than the plunger flow path 510. [

The contracting portion 511 reduces the cross-sectional area of the flow path to reduce the flow rate into the plunger flow path 510, thereby preventing a phenomenon such as hunting.

One side of the plunger 500 selectively communicates with the inlet 110 and the discharge port 120 and the other side of the plunger 500 is inserted into the piston 200 and slid.

One side of the plunger 500 is selectively opened and closed by a discharge port 120 formed on the outer peripheral surface of the valve body 100 and an inlet 110 formed at one end of the valve body 100 by the pressure of the fluid flowing into the inlet 110. [ So that a part of the fluid introduced through the inlet 110 can be discharged through the outlet 120.

The other side of the plunger 500 is inserted into the piston 200 so that the inner circumferential surface of the piston 200 and the outer circumferential surface of the plunger 500 can be slid.

Specifically, the first chamber 300 is formed between the other side of the plunger 500 and the piston 200 facing the other side of the plunger 500 to store the fluid flowing into the plunger channel 510.

That is, the other side of the plunger 500 may be formed to be narrower in diameter than one side of the plunger 500.

The elastic member 600 is disposed between the outer circumferential surface of the plunger 500 and the inner circumferential surface of the valve body 100 to provide an elastic force to the plunger 500. The elastic member 600 is installed by fitting the outer circumferential surface between the one side of the plunger 500 and the other side of the plunger 500 and is supported by the spring sheet 800 to be described later so that the plunger 500 is inserted into the inlet 110 In the direction of closing the opening.

That is, when the plunger 500 is slid toward the tartar portion of the valve body 100 by the fluid pressure flowing from the inlet 110, the elastic member 600 is contracted and the plunger 500 moves in the direction of the inlet 110 It is possible to provide a closing force in the closing direction.

The elastic member 600 can be pressed by one surface of the piston 200 facing the elastic member 600. [

Further, the elastic member 600 can be pressed by the fluid pressure in the plug chamber 720 of the regulating plug 700. [

The adjustment plug 700 is installed between the outer circumferential surface of the piston 200 and the inner circumferential surface of the valve body 100 to guide the sliding of the piston 200. Further, the regulating plug 700 presses the elastic member 600 by the hydraulic pressure supplied into the plug chamber 720 through the auxiliary passage 250 of the piston.

The regulating plug 700 can be inserted and coupled to the other end of the valve body 100. [

That is, the adjustment plug 700 can support the outer circumferential surface of the piston 200 to which the other side of the plunger 500 is inserted and slid.

For example, the regulating plug 700 may be threadably engaged with the valve body 100.

Further, a second chamber 400 may be formed between the regulating plug 700 and the piston 200. That is, the fluid introduced into the first chamber 300 flows into the second chamber 400 through the communication hole 210 and can be stored. The second chamber 400 serves to attenuate the sudden movement of the piston.

Accordingly, the regulating plug 700 can supply the stored fluid to the second chamber 400, pressurize the elastic member 600, and provide the closing force in the direction in which the plunger 500 closes the inlet 110 .

That is, the elastic member 600 can be effectively pressurized by the fluid pressure supplied to the regulating plug 700 as well as the piston 200.

Specifically, the relief valve device 101 may further include a plug 950 and a sleeve 900.

The plug 950 is engaged with the other end of the regulating plug 700. That is, the plug 950 is installed at the outermost side of the adjustment plug 700.

The sleeve 900 is coupled between the plug 950 and the piston 200 and limited in positional movement by the plug 950.

The piston 200 may further include a guide hole 220 for supplying the fluid stored in the first chamber 300 between the piston 200 and the sleeve 900 opposed to the piston 200. As the fluid is supplied between the piston (200) and the sleeve (900), the piston (200) can slide in the direction of the inlet.

Further, the relief valve apparatus 101 according to an embodiment of the present invention may further include a spring seat 800.

The spring seat 800 is installed between one side of the elastic member 600 and the opposite side of the elastic member 600 and the elastic member 600, And transmits the pressure of the fluid to the elastic member 600 when it is pressurized.

Specifically, one surface of the spring sheet 800 is in contact with the elastic member 600, and the other surface of the spring sheet 800 is in contact with one surface of the regulating plug 700 facing the elastic member 600 and / As shown in FIG.

Further, the regulating plug 700 may further include an auxiliary plug flow path 750, a plug chamber 720, and a check valve portion 730.

The auxiliary plug flow path 750 may be formed on one surface of the regulating plug 700 slidably engaged with the piston 200.

In addition, the piston 200 may further include an auxiliary passage 250. Specifically, the auxiliary passage 250 is formed in the piston 200 opposed to the auxiliary plug channel 750 and is opened by the other side of the plunger 500 to connect the first chamber 300 and the auxiliary plug channel 750 Can communicate with each other.

The auxiliary passage 250 may be formed on one side of the piston 200 slidably coupled to the other side of the plunger 500.

If the other end of the plunger 500 does not close the auxiliary passage 250 due to repeated contact between the plunger 500 and the plunger seat 10, the auxiliary passage 250 is opened and the first The stored fluid in the chamber 300 can be supplied to the plug chamber 720 through the auxiliary plug flow path 750 to effectively press the elastic member 600. [

That is, the auxiliary plug flow path 750 connects the auxiliary path 250 and the plug chamber 720 to guide the stored fluid of the first chamber 300 to the plug chamber 720. The plug chamber 720 can be formed so as to store the fluid supplied from the auxiliary plug channel 750. Further, the plug chamber 720 may be formed in a direction opposite to the spring seat 800.

Specifically, the diameter of the plug chamber 720 is formed to be larger than the diameter of the auxiliary plug channel 750, so that the fluid supplied through the auxiliary plug channel 750 can be stored.

The check valve unit 730 is provided between the auxiliary plug flow path 750 and the plug chamber 720 so that the fluid supplied from the auxiliary plug flow path 750 is supplied to the plug chamber 720 and does not flow in the opposite direction can do.

Specifically, the check valve unit 730 may be opened by the fluid pressure supplied to the auxiliary plug channel 750 to guide the fluid supplied through the auxiliary plug channel 750 to be supplied to the plug chamber 720.

When the pressure of the fluid stored in the plug chamber 720 is higher than the pressure supplied through the auxiliary plug flow path 750, the check valve part 730 closes the flow path so that the fluid is continuously supplied into the plug chamber 720 .

Thus, the regulating plug 700 can store the fluid in the plug chamber 720 and pressurize the resilient member 600 using the pressure of this fluid.

The effective area of the regulating plug 700 for pressing the spring sheet 800 may be the cross sectional area of the plug chamber 720 formed on one surface of the regulating plug 700 facing the spring seat 800. [

When the elastic member 600 fitted to the outer circumferential surface of the plunger 500 is expanded due to abrasion between the elastic member 600 and the spring seat 800 and the length is increased, 720 to press the spring sheet 800 in a direction in which the length of the elastic member 600 decreases.

Therefore, it is possible to pressurize the elastic member 600 with the fluid pressure stored in the plug chamber 720 of the regulating plug 700, so that the life of the relief valve device 101 can be improved and the responsiveness can be improved.

Further, the regulating plug 700 of the relief valve apparatus 101 according to an embodiment of the present invention may further include a plug sheet 740.

The plug seat 740 is installed in the plug chamber 720 and is pulled out of the plug chamber 720 by the fluid pressure stored in the plug chamber 720 and can press the spring seat 800.

That is, the plug sheet 740 can press the spring sheet 800 by the fluid pressure stored in the plug chamber 720 to effectively press the elastic member 600.

Hereinafter, an operation exaggeration of the relief valve apparatus 101 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

The fluid introduced through the inlet 110 is guided through the plunger flow path 510 and stored in the first chamber 300 as shown in FIG. The fluid stored in the first chamber 300 is supplied through the guide hole 220 and presses the piston 200 opposed to the sleeve 900 to move the piston 200 to one side of the valve body 100 . Further, the piston 200 presses the spring seat 800. That is, the piston 200 presses the elastic member 600 such that the plunger 500 is moved to one end of the valve body 100.

Fluid from the inlet 110 is supplied into the valve body 100 and the pressure of the fluid flowing into the inlet 110 causes the plunger 500 to move from the valve body 100 100 and the elastic member 600 is compressed.

At this time, the inlet 110, which is closed by one end of the plunger 500, is opened so that the inlet 110 and the outlet 120 communicate with each other. Part or all of the fluid introduced through the inlet 110 flows into the outlet 120, .

When the auxiliary channel 250 (shown in FIG. 1) is opened by sliding the plunger 500 due to abrasion of the plunger 500, the fluid stored in the first chamber 300 flows into the auxiliary channel 250 To the auxiliary plug flow path 750 (shown in FIG.

At this time, the plug seat 740 is pressed by the fluid pressure supplied to the plug chamber 720, and the plug seat 740 transmits the fluid pressure to the spring seat 800 to press the elastic member 600, So that the elastic force of the member 600 is recovered to the state before the abrasion. Thereby allowing the plunger 500 to effectively block the inlet 110.

That is, when the pressure of the fluid that has flowed into the inlet 110 is discharged through the outlet 120 and becomes lower than the set pressure, the fluid pressure in the plug chamber 720, which presses the elastic member 600, The elastic force of the plunger 600 is restored to its initial state, and the plunger 500 can close the inlet 110 at a constant pressure.

4, even when the fluid stored in the first chamber 300 and the auxiliary plunger flow path 750 is discharged to the outside of the valve body 100, the fluid stored in the plug chamber 720 is checked The flow path can be closed by the valve portion 730 and can be maintained in the plug chamber 720.

Thus, the regulating plug 700 can effectively pressurize the elastic member 600 with the pressure of the stored fluid inside the plug chamber 720.

With such a configuration, the relief valve apparatus 101 according to the embodiment of the present invention can effectively press the elastic member 600, thereby improving the life and responsiveness of the relief valve apparatus 101. [

In other words, the relief valve device 101 can reliably prevent the elastic force of the elastic member 600 due to the wear of the plunger 500 or the elastic force of the elastic member 600 It is possible to effectively press the elastic member 600 with a constant force despite the change of the elastic force according to the change.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be.

It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

10: plunger seat 100: valve body
101: relief valve device 110: inlet
120: Discharge port 200: Piston
210: communication hole 220: guide hole
250: auxiliary passage 300: first chamber
400: second chamber 500: plunger
510: plunger flow path 511:
600: elastic member 700: regulating plug
720: Plug chamber 730: Check valve part
740: plug sheet 750: auxiliary plug flow path
800: Spring sheet 900: Sleeve
950: Plug

Claims

A valve body including an inlet through which the fluid flows and a discharge port through which a part of the fluid is selectively discharged;
A piston which is received in the valve body and slides, the auxiliary passage being formed;
A plunger having a plunger flow path for guiding part or all of the fluid introduced from the inlet to the piston, one side of the plunger selectively communicating the inlet and the discharge port, and the other side of the plunger sliding in the piston;
An elastic member provided between an outer circumferential surface of the plunger and an inner circumferential surface of the valve body and providing an elastic force to the plunger; And
A regulating plug provided between an outer circumferential surface of the piston and an inner circumferential surface of the valve body to guide sliding of the piston and to supply the fluid through the auxiliary passage of the piston to press the elastic member;
And a relief valve device.

The method of claim 1,
Further comprising a spring seat provided between one side of the regulating plug and the elastic member,
The adjustment plug
An auxiliary plug flow path for guiding the supply of the fluid introduced through the auxiliary passage of the piston;
A plug chamber opposed to the spring seat and capable of reserving a fluid supplied from the auxiliary plug channel; And
A check valve provided between the auxiliary plug channel and the plug chamber for supplying the fluid supplied from the auxiliary plug channel to the plug chamber in one direction;
Further comprising a relief valve device.

3. The method according to claim 1 or 2,
Wherein the auxiliary passage of the piston is opened and closed in accordance with the position of the plunger.

3. The method of claim 2,
Wherein the regulating plug further comprises a plug seat installed in the plug chamber,
Wherein the plug seat presses the spring seat by a pressure of fluid stored in the plug chamber.