KR102542118B1 - Two-stage seperate double check valve - Google Patents

Abstract

The present invention relates to a two-stage separable double check valve to prevent oil leakage even if a defect or slight shape deformation occurs. According to the present invention, the two-stage separable double check valve comprises: a valve body including a first body part having a first inner diameter and a second body part extending from one end of the first body part, having a second inner diameter smaller than the first inner diameter, and having a plurality of first through-holes formed therein; a slide part formed in a hollow cylindrical shape and inserted into the first body; a slide body including a curved part formed on the outer surface of the slide part with a first width and a flat part, which is a flat surface connected to the curved part and formed in a second width, formed with a second through-hole communicating with the hollow; an opening and closing member having a spherical surface disposed at a tip of the slide part to open and close the second body part; and an elastic member disposed inside the first body part and elastically supporting the slide part.

Description

2-stage separable double check valve {TWO-STAGE SEPERATE DOUBLE CHECK VALVE}

The present invention relates to a two-stage separate double check valve.

In general, check valves or double check valves are widely used in construction machines, excavators, hydraulic equipment, etc. that linearly reciprocate cylinders by hydraulic pressure.

Registered Patent No. 10-0985814, technology to prevent reduction in operating speed and noise caused by chattering and hunting phenomena, in which the flow of oil is momentarily not smooth in the double pilot check valve equipped with an anti-cavitation device This is disclosed.

In the Patent Registration No. 10-0985814, the first taper surface, the second guide part, and the second pressing part are detachable around the first guide hole of the first pocket guide to regulate the flow of oil between the main passage and the first oil hole. Between them, second tapered surfaces are formed around the second guide hole of the second poppet guide to regulate the flow of oil between the main passage and the second oil hole.

That is, in the Patent Registration No. 10-0985814, the first guide hole is opened and closed by the first taper surface, and the second guide hole is opened and closed by the second taper surface.

However, when deviations, tolerances, and processing defects occur in the process of manufacturing the first guide hole and the first taper surface, or when minute shape deformation of the structure occurs due to external force, the alignment between the first guide hole and the first taper surface Oil leaks due to defects may cause malfunctions of construction machines, excavators, and hydraulic equipment.

In the same way, when deviations, tolerances, and processing defects occur in the process of manufacturing the second guide hole and the second taper surface, or when fine shape deformation of the structure occurs due to external force, the gap between the second guide hole and the second taper surface Oil leaks due to misalignment may cause malfunctions of construction machines, excavators, and hydraulic equipment.

In this way, when oil leakage occurs from the check valve and the double check valve, the check valve and the double check valve must be replaced, and recall and repair costs are incurred in this process.

Registered Patent No. 10-0985814, double pilot check valve with anti-cavitation device (Registration date: September 30, 2010)

The present invention is an improved two-stage separation type that can prevent oil leakage even when deviations, tolerances, and fine processing defects occur in an opening through which oil flows in and out and an opening and closing member that opens and closes the opening, or when a fine shape deformation of a structure occurs due to an external force. A double check valve is provided.

As an embodiment, the oil leak prevention check valve includes a first body portion having a first inner diameter and a second inner diameter extending from one end of the first body portion and having a plurality of first through holes formed with a second inner diameter smaller than the first inner diameter. a valve body having two body parts; A slide part inserted into the first body part in a cylindrical shape having a hollow shape, a curved part formed on an outer surface of the slide part with a first width and being a curved surface, and a flat surface connected to the curved part and formed with a second width, and the hollow part A slide body including a flat portion having a second through hole communicating therewith; and an opening/closing member having a spherical surface disposed at a front end of the sliding portion to open and close the second body portion. and an elastic member disposed inside the first body portion and elastically supporting the slide portion.

A partition wall is formed inside the slide part of the oil leak prevention check valve, and the opening and closing member is disposed in a first groove formed by the partition wall among the slide parts,

The elastic member is disposed in a second groove formed by the partition wall among the slide parts, and the size of the first groove is determined so that the opening and closing member moves inside the first groove and seals the inlet of the second body. is formed larger than the size of

A chamfer is formed at the tip of the slide part of the oil leak prevention check valve so as not to interfere with the valve body, and the opening and closing member is formed in a ball shape.

Four flat parts and four curved parts are alternately formed in the slide part of the oil leak prevention check valve, and at least one second through hole is formed in the flat part.

Six flat parts and six curved parts are alternately formed in the slide part of the oil leak prevention check valve, and at least one second through hole is formed in the flat part.

In order to seal the inlet while the opening/closing member of the oil leak prevention check valve is automatically aligned with the inlet of the second body, the slide part is formed to a size tilted at a predetermined angle inside the first body.

The oil leak prevention check valve further includes a separation preventing unit including a separation preventing member coupled to the first body portion and a fixing ring fixing the separation preventing member to prevent separation of the elastic member.

A two-stage separate double check valve including an oil leak prevention check valve includes a housing body having a block shape, a first hole penetrating both sides of the housing body, and a second hole formed to communicate with the first hole from the upper surface of the housing body. a housing including a hole and a third hole communicating with the first hole and spaced apart from the second hole from an upper surface of the housing body; a piston sliding inside the first hole; And a first body portion coupled to the first holes formed on both sides of the housing body and having a first inner diameter, and a second inner diameter extending into the housing body from the first body portion and smaller than the first inner diameter. A valve body having a second body portion having a plurality of first through holes formed therein and communicating with the second and third holes, respectively, a slide portion inserted into the first body portion in a hollow tubular shape, and the slide portion A slide body including a curved portion formed on an outer surface having a first width and a flat portion connected to the curved portion and having a second through hole communicating with the hollow with a flat portion connected to the curved portion and having a second width, the second body and an oil leak prevention check valve including an opening/closing member having a spherical surface disposed at a front end of the slide unit to open and close the unit, and an elastic member disposed inside the first body unit and elastically supporting the slide unit.

The two-stage separable double check valve according to the present invention prevents leakage of oil even when deviations, tolerances, and minute processing defects occur in an opening through which oil flows in and out and an opening and closing member that opens and closes the opening, or even when a minute shape deformation of the structure occurs due to an external force. have an effect that can

1 is an external perspective view of a two-stage separation type double check valve according to an embodiment of the present invention.
Figure 2 is a longitudinal cross-sectional view of Figure 1;
3 is a cross-sectional perspective view of the oil leak prevention check valve shown in FIGS. 1 and 2;
FIG. 4 is a perspective view illustrating the slide body shown in FIG. 3;
5 is a perspective view showing a slide unit according to another embodiment of the present invention.
The operation of the two-stage separate double check valve will be briefly described with reference to FIG. 6 .

The present invention described below may apply various transformations and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description.

However, it should be understood that this is not intended to limit the present invention to specific embodiments, and includes all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

Terms used in this patent are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this patent, terms such as "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In addition, terms such as first and second may be used to classify and describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

In addition, when at least two different embodiments are described in this patent, all or part of the components of each embodiment can be merged and mixed with each other, even if there is no specific description, within the scope of not departing from the technical spirit of the present invention. .

1 is an external perspective view of a two-stage separation type double check valve according to an embodiment of the present invention. Figure 2 is a longitudinal cross-sectional view of Figure 1;

Referring to FIGS. 1 and 2 , the two-stage separable double check valve 500 includes a housing 100, a piston 200, and an oil leak prevention check valve 300.

The housing 100 includes a housing body 110 , a first hole 120 , a second hole 130 and a third hole 140 .

The housing body 110 may be made in a block shape, and the housing body 110 may be made of, for example, a metal material.

The housing body 110 may be formed in, for example, a rectangular parallelepiped block shape. The housing body 110 includes, for example, a top surface 111 , two opposing side surfaces 112 and 113 , and a bottom surface 114 facing the top surface 111 .

The first hole 120 is formed in a first direction defined in FIG. 2 penetrating the two side surfaces 112 and 113 of the housing body 110 .

The second hole 130 is formed in a second direction from the upper surface 111 of the housing body 110 to the lower surface 114 , and the second hole 130 communicates with the first hole 120 .

The third hole 140 is formed in a second direction from the upper surface 111 of the housing body 110 to the lower surface 114 , and the third hole 140 also communicates with the first hole 120 .

In one embodiment of the present invention, the second hole 130 and the third hole 140 are spaced apart from each other by a predetermined distance, and oil flows in or out through the second hole 130 and the third hole 140. .

The piston 200 includes a piston body 210 , a first pusher 220 and a second pusher 230 .

The piston body 210 is inserted into the first hole 120 and is formed in a shape and size that slides along the first hole 120 . A sealing ring 215 is coupled to the piston body 210 .

The first pusher 220 protrudes from one side of the piston body 210 toward the side 112 of the housing body 110, and the second pusher 230 also protrudes from the other side of the piston body 210 to the housing body 110. It protrudes in a direction toward the side surface 113 of the body 110.

At this time, the lengths of the first and second pushers 220 and 230 are longer than the length of the second body of the oil leak prevention check valve 300 to be described later, and the diameters of the first and second pushers 220 and 230 are the second body. It is formed smaller than the inner diameter of 314, which is to allow oil to pass between the first and second pushers 220 and 230 and the second body portion 314.

The piston 200 slides along the first direction inside the first hole 120 in response to the pressure of the fluid provided to the second hole 130 and the third hole 140 .

The oil leak prevention check valve 300 includes an inlet of a first hole 120 formed on a side surface 112 formed on one side of the housing body 110 and a first hole formed on a side surface 113 formed on the other side of the housing body 110. It is coupled to the inlet of 120 in a screw manner, respectively.

In one embodiment of the present invention, the two oil-leakage check valves 300 are coupled in a mutually symmetrical form with respect to the center of the housing body 110, and two oil-leakage check valves having the same shape and performing the same function ( 300) will be given the same name and the same code.

3 is a cross-sectional perspective view of the oil leak prevention check valve shown in FIGS. 1 and 2;

Referring to FIGS. 2 and 3 , the oil leak prevention check valve 300 includes a valve body 310 , a slide body 320 , an opening/closing member 330 and an elastic member 340 . In addition to this, the oil leak prevention check valve 300 further includes a separation prevention unit 350 .

The valve body 310 serves as a housing. The valve body 310 includes a first body portion 312 and a second body portion 314.

The first body portion 312 is formed in a cylindrical shape having a hollow and both ends open, and the first body portion 312 has a first inner diameter.

The second body portion 314 having a cylindrical shape extends from one end of the first body portion 312, the second body portion 314 is formed in a pipe shape having a hollow, the second body portion 314 has a second inner diameter smaller than the first inner diameter.

A plurality of first through-holes 315 are formed in the second body portion 314 , and oil flows in and out through the first through-holes 315 .

As the second inner diameter of the second body portion 314 is smaller than the inner diameter of the first body portion 312 and the second body portion 314 extends from the first body portion 312, the first and second A stepped portion is formed between the body portions 312 and 314.

An oil input/output port 316 through which oil enters and exits extends in a cylindrical shape to the other end of the first body portion 312 where the second body portion 314 is not formed.

In one embodiment of the present invention, a male screw portion 313 is formed on an outer surface adjacent to the second body portion 314 of the first body portion 312 . The male screw part 313 is screwed into the female screw part formed at the entrance of the first hole 120 formed on the side surfaces 112 and 113 formed on the housing body 110 . Reference number 312a is a stopper that limits the position where the first body part 312 is coupled to the housing body 110.

The slide body 320 reciprocates inside the valve body 310 and serves to open or close the opening formed by the opening and closing member 330 to be described later by the second body portion 314 .

FIG. 4 is a perspective view illustrating the slide body shown in FIG. 3;

Referring to FIGS. 3 and 4 , the slide body 320 includes a slide part 322 , a curved part 324 and a flat part 326 . In addition to this, the slide body 320 may further include a partition wall 328 .

The slide part 322 may be formed in a cylindrical shape having a hollow, and the slide part 322 is formed to a size inserted into the inner surface of the first body part 312 . The slide part 322 is manufactured to a length that can be moved inside the first body part 312 .

In one embodiment of the present invention, the slide unit 322 may be formed in a polygonal tubular shape, for example. The slide part 322 shown in FIG. 4 may be formed in a rectangular cylinder shape.

Referring to FIG. 4, the slide part 322 formed in the shape of a square cylinder is formed with a curved part 324 having a similar curvature to the inner surface of the first body part 312, and the curved part 324 has a first width. And, the first width is formed shorter than the length of the inner circumferential surface of the first body portion 312.

Meanwhile, the slide part 322 includes a flat part 326 that is a flat surface connected to the curved part 324 .

4, the slide part 322 is formed in the shape of a square cylinder, and includes four flat parts 326 disposed perpendicular to each other and curved parts 324 formed at the corners of the four flat parts 326, and is flat. The portion 326 and the curved portion 324 are formed alternately.

In one embodiment of the present invention, the curved portion 324 is in contact with the first body portion 312, so that the sliding portion 322 can be moved along the inner circumferential surface of the first body portion (312).

On the other hand, a space is formed between the flat part 326 and the inner circumferential surface of the first body part 312 corresponding to the flat part 326, and oil passes through this space, and the oil passing through this space is transferred to each flat part. It passes through the second through hole 325 formed every 326 .

Although in one embodiment of the invention, the second through hole 325 formed in the flat portion 326 has a circular shape, and it is shown and described that one is formed in the flat portion 326, the second through hole 325 At least two may be formed in the flat part 326, and the shape of the second through hole 325 may be elliptical, triangular, quadrangular, rectangular, or polygonal instead of circular. It may be formed in various shapes such as a slit shape. On the other hand, by forming female threads in the second through holes 325 and fastening bolts to some of the second through holes 325, the flow rate of oil passing through the second through holes 325 is reduced. It is free to regulate.

Meanwhile, a chamfer 323 may be formed at the front end of the slide part 320 so as not to interfere with the valve body 310 .

5 is a perspective view showing a slide unit according to another embodiment of the present invention.

Referring to FIG. 5, the slide part 320 is formed in a hexagonal cylinder shape, and the slide part 320 may include six flat parts 326 and six curved parts 324, and each flat part ( A second through hole 325 may be formed in 326 .

Comparing the slide part 320 of FIG. 4 and the slide part 320 of FIG. 5 , the slide part 320 of FIG. 4 has a wide space between the inner diameter of the first body part 312 and the flat part 326. The reaction speed of the device operated by hydraulic pressure is fast because the amount of oil flowing in and out per unit time is large.

On the other hand, in the slide part 320 of FIG. 5, the space between the inner diameter of the first body part 312 and the flat part 326 is relatively narrow, so that the inflow and outflow of oil per unit time is relatively small, so it is a device operated by hydraulic pressure. Response may be slow.

Referring back to FIG. 3 , a partition wall 328 blocking the hollow of the slide unit 320 may be formed inside the slide unit 320 to support an opening and closing member 330 to be described later.

In one embodiment of the present invention, an opening/closing member 330 is disposed in a first groove formed on one side of the slide part 320 by the partition wall 328 among the slide parts 320 .

Meanwhile, an elastic member 340 to be described later is disposed in a second groove formed on the other side of the slide part 320 by the partition wall 328 among the slide parts 320 .

In one embodiment of the present invention, the opening and closing member 330 may be fixed to the slide unit 320, but to prevent leakage of oil caused when the second body 314 and the opening and closing member 330 are not precisely aligned. To seal the inlet of the second body portion 314 while the opening/closing member 330 moves inside the first groove, the size of the first groove is formed larger than the size of the opening/closing member 330 . That is, by arranging the opening and closing member 330 to move inside the sliding portion 320, the opening and closing member 330 can be sealed while being aligned with the inlet of the second body portion 314 by itself.

Alternatively, in order for the opening/closing member 330 to align itself with the inlet of the second body 314, the slide unit 320 may be formed in a size tilted at a predetermined angle inside the first body 312. can That is, as the sliding part 320 to which the opening and closing member 330 is mounted is tilted inside the first body 312 , the opening and closing member 330 may align itself with the inlet of the second body 314 .

Referring back to FIG. 3 , the opening/closing member 330 is disposed at the front end of the slide unit 320 , and the opening/closing member 330 faces the inlet of the second body 314 .

In one embodiment of the present invention, the opening and closing member 330 may have a portion facing the inlet of the second body portion 314 to have a spherical surface. That is, the opening and closing member 330 may have a hemispherical shape or a ball shape capable of sealing the inlet of the second body portion 314 by coming into contact with the inlet of the second body portion 314 .

Referring again to FIG. 3 , the elastic member 340 elastically supports the slide body 320 disposed inside the first body 312 and returns the opening/closing member 330 .

The elastic member 340 may include a coil spring disposed inside the slide unit 322 . One end of the elastic member 340 is disposed on the partition wall 328 disposed inside the slide unit 322, and the other end of the elastic member 340 is disposed on the detachment prevention unit 350 to be described later.

On the other hand, in order to prevent the elastic member 340 from being separated from the slide unit 322, a separation preventing member 352 having a washer shape is fitted to the inner circumferential surface of the first body portion 312, and the separation preventing member 352 A fixing ring 354 is coupled to the separation receiving member 352 to prevent separation.

The operation of the two-stage separate double check valve will be briefly described with reference to FIG. 6 .

Referring to FIG. 6, when oil having hydraulic pressure is supplied through the third opening 140 of the housing 100, the piston 200 is pushed from the right to the left by the pressure of the oil and the oil leak prevention check placed on the left side As the opening/closing member 330 of the valve 300 is pushed out, the second hole 130 and the first body 312 and the second body 314 of the slide unit 310 communicate with each other.

On the other hand, when the piston 200 is pushed from the right to the left by the pressure of oil, the opening/closing bath 330 of the anti-leakage check valve 300 disposed on the right side is also pushed by the pressure of the oil, and the third hole 140 , The first body portion 312 and the second body portion 314 of the slide portion 310 are also in communication.

As a result, the oil flows into the third hole 140, the second body portion 314, the first body portion 312, and the inside of the slider portion 322, and then is discharged through the oil entry/exit port 316 and discharged. Oil pushes the cylinder from right to left.

As the cylinder is pushed from the right to the left, the oil in the cylinder flows through the oil entry/exit port 316, the slider part 322, and the first body part 312 of the anti-leakage check valve 300 disposed on the left side of FIG. , After passing through the second body portion 314, it is discharged to the second hole 130.

According to the detailed description above, even if deviations, tolerances, and minute processing defects occur in the opening through which oil flows in and out and the opening and closing member that opens and closes the opening, or even if minute shape deformation of the structure occurs due to external force, leakage of oil can be prevented. have an effect

On the other hand, the embodiments disclosed in the drawings are only presented as specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is obvious to those skilled in the art that other modified examples based on the technical idea of the present invention can be implemented in addition to the embodiments disclosed herein.

100 ... housing 200 ... piston
300 ... oil-tight check valve 310 ... valve body
320 ... slide body 330 ... opening and closing member
340 ... elastic member 350 ... departure prevention unit

Claims (8)

A housing body having a block shape, a first hole passing through both side surfaces of the housing body, a second hole formed to communicate with the first hole from an upper surface of the housing body, and spaced apart from the second hole from an upper surface of the housing body a housing including a third hole communicating with the first hole;
a piston sliding inside the first hole; and
A first body portion coupled to the first holes formed on both sides of the housing body and having a first inner diameter, and a second inner diameter extending into the housing body from the first body portion and smaller than the first inner diameter A valve body having a second body portion having a plurality of first through-holes and communicating with the second and third holes, respectively, a slide portion inserted into the first body portion in a cylindrical shape having a hollow and an outside of the slide portion A curved portion formed on a side surface having a first width and sliding with the inner surface of the first body portion, and a flat portion connected to the curved portion and formed with a second width and having a second through hole communicating with the hollow. An oil leak prevention check including a slide body including a slide body, an opening/closing member having a spherical surface disposed at the front end of the slide unit to open and close the second body unit, and an elastic member disposed inside the first body unit and elastically supporting the slide unit. contains a valve;
The slide part slides inside the first body part and reciprocates,
The oil introduced into the space formed between the flat part of the slide part and the inner circumferential surface of the first body part passes through the second through hole formed for each flat part, moves into the slide part, passes through the elastic member, and discharged from the slide part,
The flat part is formed from one end of the slide part to the other end of the slide part,
At least one second through hole is formed in the flat portion,
Female screw portions are formed in some of the second through holes. A two-stage separable double check valve that adjusts the flow rate of oil passing through the second through hole by fastening a bolt to the female screw portion. According to claim 1,
A partition wall is formed inside the slide part,
The opening and closing member is disposed in a first groove formed by the partition wall among the sliding parts,
The elastic member is disposed in a second groove formed by the partition wall among the sliding parts,
The two-stage separable double check valve wherein the size of the first groove is larger than the size of the opening and closing member to seal the inlet of the second body while the opening and closing member moves inside the first groove. According to claim 1,
A chamfer is formed at the tip of the slide so as not to interfere with the valve body,
The opening and closing member is a two-stage separate double check valve formed in a ball shape. delete According to claim 1,
The slide part is alternately formed with six flat parts and six curved parts, and at least one second through hole is formed in the flat part. According to claim 1,
The two-stage separable double check valve, wherein the slide part is formed to a size that is tilted at a predetermined angle inside the first body part to seal the inlet while the opening and closing member is automatically aligned with the inlet of the second body part. According to claim 1,
The two-stage separable double check valve further comprising a separation preventing unit including a separation preventing member coupled to the first body portion and a fixing ring fixing the separation preventing member to prevent separation of the elastic member. delete

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