WO2018034536A1

WO2018034536A1 - Valve assembly for discharging air, and hydraulic actuator for power plant, having same

Info

Publication number: WO2018034536A1
Application number: PCT/KR2017/009011
Authority: WO
Inventors: 양천규; 김수철; 이승훈; 이동훈; 최용대; 이세호; 송규조; 임훈
Original assignee: 주식회사 에네스지
Priority date: 2016-08-18
Filing date: 2017-08-18
Publication date: 2018-02-22
Also published as: KR101739303B1; PH12018502199A1; MY192675A

Abstract

The present invention relates to a valve assembly for discharging air which selectively discharges air and a hydraulic fluid, and to a hydraulic actuator for a power plant, having the valve assembly. The valve assembly for discharging air according to the present invention comprises: a valve body having an entry and exit passage through which a hydraulic fluid flows in and out, and a discharge passage for discharging, to the outside, air and the hydraulic fluid which have been introduced through the entry and exit passage; a spherical valve spool disposed in the valve body and reciprocating so as to selectively discharge the air and the hydraulic fluid in accordance with the hydraulic fluid flowing into and out of the valve body; and a throttling part formed to have a gap between the valve body and the spherical valve spool and throttling the hydraulic fluid flowing through the gap.

Description

Air vent valve assembly and hydraulic actuator for power plant having same

The present invention relates to an air discharge valve assembly and a hydraulic actuator for a power plant having the same, and more particularly, to an air discharge valve assembly for discharging air and hydraulic oil, and a hydraulic actuator for a power plant having the same.

The hydraulic actuator basically consists of a cylinder and a piston, and is a device that provides and releases a driving force to the piston according to the inflow and outflow of the hydraulic oil to the cylinder. In general, the hydraulic actuator is mainly used in the linear system for linearly reciprocating the piston in accordance with the hydraulic force of the hydraulic oil.

Here, the hydraulic actuator is used to provide a driving force to the configuration, such as a valve connected to the piston, or widely used in various industries to provide the kinetic force to the object connected to the piston. For example, hydraulic actuators are widely used in various fields such as construction machinery field and power plant field.

Such a hydraulic actuator reciprocates the piston in accordance with the provision of the hydraulic force of the hydraulic oil drawn in and out of the cylinder with respect to the piston as described above. On the other hand, the hydraulic oil supplied to the cylinder not only contains air but also air may exist inside the cylinder. The air contained in the hydraulic oil and the air which may exist inside the cylinder may be compressed in the pressurized region inside the cylinder because it is a compressive fluid.

However, in the conventional hydraulic actuator, when the hydraulic oil is supplied into the cylinder, when the air included in the hydraulic oil and the air existing in the cylinder are compressed and exploded, damage to the sealing member of the piston may occur. Then, leakage of hydraulic oil may occur according to breakage of the sealing member of the piston, and thus there is a problem that the operating reliability of the hydraulic actuator may be lowered.

In particular, a hydraulic actuator for a power plant used in a power plant may cause a large loss to the power plant as it affects turbine operation reliability when the reliability of operation decreases due to damage of the sealing member due to the compression explosion of air in the cylinder. There is also a problem.

SUMMARY OF THE INVENTION An object of the present invention is an air discharge valve assembly having an improved structure for discharging air contained in hydraulic oil and air that may be present inside a cylinder from a pressure region of a piston to a negative pressure region when hydraulic oil is supplied, and a power plant having the same. It is to provide a hydraulic actuator.

According to the present invention, there is provided a valve body having a withdrawal flow path through which hydraulic oil is drawn in and out, and a discharge flow path for discharging the hydraulic oil drawn into the withdrawal flow path and air to the outside, and disposed inside the valve body. And a valve spool of the sphere reciprocated to selectively discharge air and hydraulic oil according to the hydraulic oil drawn in and out of the valve body, and formed to have a gap between the valve body and the valve spool of the sphere and flow into the gap. It is made by a valve assembly for air discharge comprising a throttling action portion for throttling the hydraulic oil to be.

Here, the discharge flow path is formed opposite to the take-out flow path to discharge the hydraulic oil and air drawn into the valve body to the outside of the valve body, between the take-out flow path and the first discharge flow path And a second discharge passage configured to guide the hydraulic oil and air drawn into the withdrawal passage to the first discharge passage.

Preferably, the throttling action portion is formed in the gap by the notch processing in the valve body region on the upstream side of the first discharge passage through which the hydraulic oil and the air are discharged, and may throttle the hydraulic oil discharged to the first discharge passage. .

On the other hand, the throttling action portion is formed by a notch in the valve body region on the upstream side of the first discharge passage through which the hydraulic oil and air are discharged to throttle the hydraulic oil and air flowing into the first clearance. A second throttling action for throttling a hydraulic fluid flowing through the first throttling action portion and a plurality of second gaps recessed in the second discharge passage along a reciprocating direction of movement of the valve spool of the sphere; It may include wealth.

The throttling action portion may drop the pressure along the flow direction of the hydraulic oil flowing into the gap to guide the air and the hydraulic oil to the first discharge passage.

The second throttle action portion sequentially drops the pressure along the flow direction of the hydraulic oil flowing into the second gap, guides air and hydraulic oil to the first throttle action portion, and the first throttle action portion is the second throttle action portion. The pressure may be lowered along the flow direction of the hydraulic oil flowing from the first gap to guide the air and the hydraulic oil to the first discharge passage.

The second throttle action portion may provide the same pressure between the valve body and the valve spool of the sphere disposed with the second clearance therebetween to prevent eccentric movement of the valve spool of the sphere.

The second throttle action portion may receive foreign matter contained in the hydraulic oil guided to the first discharge passage to prevent a decrease in lubricating force between the valve body and the valve spool of the sphere.

The valve body has a first valve body in which the draw flow path is formed, through which hydraulic oil is drawn in and out, and is connected to the first valve body, and the first discharge flow path and the second discharge flow path are formed, and the valve spool of the sphere is formed. It may include a second valve body is formed receiving portion for receiving.

The accommodating portion has a shape corresponding to the cross-sectional shape of the valve spool of the sphere, and the second discharge passage is formed in the second valve body in the circumferential direction of the accommodating portion is recessed so that the valve spool of the sphere is drawn out Air and hydraulic oil may be guided to the first discharge passage between a first position adjacent to the inlet passage and a second position adjacent to the first discharge passage.

The second discharge passage may be recessed in the second valve body along a reciprocating direction of movement between the first position and the second position of the valve spool of the sphere.

The air vent valve assembly may further include an elastic member disposed in the first discharge passage of the valve body to provide an elastic force to the valve spool of the sphere.

In addition, the air discharge valve assembly is disposed between the valve spool and the elastic member of the sphere, when the valve spool of the sphere is moved to the first discharge passage by the hydraulic oil introduced into the withdrawal flow passage It may further include an intermediate member for providing the hydraulic force provided to the valve spool to the elastic member and providing the elastic force of the elastic member to the valve spool of the sphere when the hydraulic oil is discharged from the inside of the valve body into the draw-out flow path have.

The media member preferably has a lower hardness than the valve spool and the elastic member of the sphere.

On the other hand, according to the present invention, there is provided a piston, a cylinder in which a hydraulic oil receiving space is formed, which receives the piston and the hydraulic oil for reciprocating the piston is formed, and the reciprocating movement direction of the piston It is also made by a hydraulic actuator for a power plant, characterized in that it comprises a valve assembly for any one of the above-described configuration disposed in the piston to discharge the air and hydraulic oil drawn into the cylinder.

Specific details of other embodiments are included in the detailed description and drawings.

Effects of the air discharge valve assembly and the hydraulic actuator for power plant having the same according to the present invention are as follows.

First, when hydraulic oil is supplied to the pressurized region of the cylinder, the valve spool of the sphere is moved and the air and hydraulic oil can be continuously discharged using the throttling action part, so that the sealing components such as sealing members due to the compression explosion of the air are damaged. Prevention can improve operational reliability with extended life of sealing components.

Secondly, between the valve spool and the elastic member of the sphere to arrange the intermediate member having a relatively low hardness compared to the valve spool and the elastic member of the sphere, when the valve spool of the sphere is reciprocated inside the valve body, the valve spool and elastic of the sphere Damage to the member can be prevented, thereby improving the maintenance efficiency of the product.

1 is a cross-sectional view of a hydraulic actuator for a power plant according to embodiments of the present invention,

2 is an operation cross-sectional view of the valve assembly for air discharge according to the first embodiment of the present invention,

3 is a first cross-sectional view of an air discharge valve assembly according to a second embodiment of the present invention;

4 is a cross-sectional view of the IV-IV line shown in FIG.

5 is a cross-sectional view of a second operation of the valve assembly for air discharge according to the second embodiment of the present invention;

6 is a cross-sectional view of the VI-VI line shown in FIG.

7 is a first enlarged cross-sectional view of the VIII-VIII line shown in FIG. 6 for the area A shown in FIG. 5;

FIG. 8 is a second enlarged cross-sectional view of the VIII-VIII line shown in FIG. 6 for the region A shown in FIG. 5;

9 is a first operation cross-sectional view of a valve assembly for air discharge according to a third embodiment of the present invention;

10 is a cross-sectional view of the VIII-VIII line shown in FIG.

FIG. 11 is an enlarged cross-sectional view of region B shown in FIG. 9;

12 is a cross-sectional view of a second operation of the air vent valve assembly according to the third embodiment of the present invention;

FIG. 13 is an enlarged cross-sectional view of region D shown in FIG. 12;

14 is a cross-sectional view taken along the line XIV-XIV shown in FIG. 12;

15 is a first operation cross-sectional view of a valve assembly for air discharge according to a fourth embodiment of the present invention;

16 is a cross-sectional view of a second operation of the air valve assembly according to the fourth embodiment of the present invention.

Hereinafter, an air discharge valve assembly and a power plant hydraulic actuator having the same according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to the description, it is noted that the air discharge valve assembly according to the embodiments of the present invention may be applied to various hydraulic devices such as mechanical fields, in addition to the hydraulic actuator for power plants described below.

In addition, the air outlet valve assembly according to the first to fourth embodiments of the present invention will be apparent that the same reference numerals denote the same reference numerals.

1 is a cross-sectional view of a hydraulic actuator for a power plant according to embodiments of the present invention.

As shown in FIG. 1, the hydraulic actuator 10 for a power plant according to embodiments of the present invention includes a piston 100, a cylinder 300, and an air discharge valve assembly 500. In addition, the hydraulic actuator 10 for the power plant according to the embodiments of the present invention further includes a hydraulic oil storage unit 400.

Piston 100 is connected to a turbine valve not shown to adjust the amount of steam supplied to the turbine. The piston 100 is disposed inside the cylinder 300 and is reciprocated according to the hydraulic oil F (refer to FIGS. 5, 6, 12 to 14 and 16) drawn out with respect to the cylinder 300. The piston 100 divides the inside of the cylinder 300 into a pressurized region provided to the hydraulic force by the hydraulic oil F and a negative pressure region not provided with the hydraulic force, that is, opposed to the pressurized region based on the piston 100. . In the embodiments of the present invention described as a single-actuated power plant hydraulic actuator 10 is permanently divided into a pressurized region and a negative pressure region by the piston 100, in contrast, in the hydraulic actuator for a double-acting power plant based on the piston 100 As a result, the pressurized region and the negative pressure region may be alternately substituted.

The cylinder 300 forms a receiving space of the piston 100 for receiving the piston 100. As described above, the interior of the cylinder 300 is divided into a pressurized region in which hydraulic pressure is provided based on the piston 100 and a negative pressure region in which no hydraulic force is provided. Hydraulic oil (F) is drawn in and out in the pressurized region inside the cylinder 300 to provide hydraulic pressure to the piston (100).

The hydraulic oil storage unit 400 is arranged to circulate the hydraulic oil F drawn in and out of the cylinder 300, that is, to store the hydraulic oil F drawn in and out of the cylinder 300. .

The air vent valve assembly 500 is disposed on the piston 100. The air discharge valve assembly 500 is disposed in the piston 100 corresponding to the reciprocating direction of the piston 100. The air discharge valve assembly 500 will be described in detail in the air discharge valve assembly 500 according to the first to fourth embodiments of the present invention to be described later.

First and Second Embodiments

2 is an operation cross-sectional view of the air discharge valve assembly according to the first embodiment of the present invention, Figure 3 is a first operation cross-sectional view of the air discharge valve assembly according to a second embodiment of the present invention, Figure 4 is FIG. 5 is a cross-sectional view of the IV-IV line, FIG. 5 is a second operation cross-sectional view of the air vent valve assembly according to the second embodiment of the present invention, FIG. 6 is a cross-sectional view of the VI-VI line shown in FIG. 5, FIG. A first enlarged cross-sectional view of the VIII-VIII line shown in FIG. 6 for region A shown in FIG. 8, and FIG. 8 is a second enlarged cross-sectional view of the VIII-VIII line shown in FIG. 6 for region A shown in FIG.

The air discharge valve assembly 500 according to the first and second embodiments of the present invention, as shown in Figures 2 to 8, the valve body 510, the draw-out flow passage 520, the discharge passage 530 And a valve spool 550 and a throttle action 580. In addition, the air discharge valve assembly 500 according to the first and second embodiments of the present invention further includes an elastic member 560.

The valve body 510 is disposed on the piston 100. In detail, the valve body 510 is disposed in the same direction along the reciprocating direction of the piston 100. In the valve body 510, the hydraulic oil F is drawn in and out of the inflow and outflow path 520 and the inflow and outflow path 520, the hydraulic oil F, the air contained in the hydraulic oil F, and the cylinder 300 are present. A discharge passage 530 is formed to discharge the air to the outside of the valve body 510. Here, the valve body 510 is disposed in the piston 100 so that the inflow and outflow passage 520 communicates with the pressurized region of the cylinder 300, and the discharge passage 530 communicates with the negative pressure region of the cylinder 300.

The valve body 510 includes, as an embodiment of the present invention, a first valve body 512, a second valve body 514, and a receiving part 516. The first valve body 512 has a withdrawal flow passage 520 through which the hydraulic oil F is drawn in and out. On the other hand, the second valve body 514 discharges the hydraulic oil F introduced into the withdrawal flow passage 520, the air contained in the hydraulic oil F, and the air existing in the cylinder 300 to the valve body 510. A discharge passage 530 is formed. The receiving part 516 is formed inside the second valve body 514 to receive the valve spool 550 of the sphere. In detail, the receiving portion 516 is a space in which the valve spool 550 of the sphere is reciprocated between a first position adjacent to the withdrawal flow passage 520 and a second position adjacent to the first discharge passage 532 to be described later. To form.

The withdrawal passage 520 is formed in the first valve body 512 as described above. The withdrawal flow passage 520 communicates with the pressurized region inside the cylinder 300 to draw in and out the hydraulic oil F drawn into and out of the pressurized region. The hydraulic oil F introduced through the withdrawal flow passage 520 provides hydraulic pressure to the valve spool 550 of the sphere so that the valve spool 550 of the sphere moves from the first position to the second position. On the other hand, the withdrawal flow path 520, as in the second embodiment, includes a first withdrawal flow path 522 and a second withdrawal flow path 524.

The first draw-out passage 522 is formed in the first valve body 512 to provide hydraulic pressure to the valve spool 550 of the sphere when the hydraulic oil (F) is drawn in. The second draw-out flow passage 524 is formed in the first valve body 512 in the circumferential direction of the first draw-in flow passage 522, the contact area in contact with the valve spool 550 of the sphere is notch (notch) Processed. The contact area between the second draw-in flow passage 524 and the valve spool 550 of the sphere is notched to guide the hydraulic oil F to the receiving portion 516 when the hydraulic oil F is drawn in. Thus, the second draw-out flow passage 524 guides the hydraulic oil F more quickly to the second discharge flow passage 534 than the first draw-out flow passage 522.

The discharge passage 530 discharges the hydraulic oil F introduced into the withdrawal passage 520, the air included in the hydraulic oil F, and the air existing in the cylinder 300 to the outside of the valve body 510. Here, the hydraulic oil F discharged to the discharge passage 530 is a very small amount does not affect the operation reliability of the piston 100. As an embodiment of the present invention, the discharge passage 530 includes a first discharge passage 532 and a second discharge passage 534.

The first discharge passage 532 is formed to face the withdrawal passage 520 to discharge the hydraulic oil F and air to the outside of the valve body 510. The first discharge passage 532 discharges not only when the valve spool 550 of the sphere is moved from the first position to the second position, but also when the valve spool 550 of the sphere is positioned in the second position. Through 580 to discharge a very small amount of hydraulic oil (F) and air.

The second discharge passage 534 is formed between the withdrawal passage 520 and the first discharge passage 532 so that the withdrawal in and out when the valve spool 550 of the sphere is reciprocated between the first position and the second position. The hydraulic oil F and air drawn in from the flow passage 520 are guided to the first discharge passage 532. The second discharge passage 534 of the present invention is recessed in the second valve body 514 along the reciprocating direction of movement between the first and second positions of the valve spool 550 of the sphere.

In detail, the second discharge passage 534 is recessed along the circumferential direction of the inner surface of the second valve body 514 in which the receiving portion 516 is formed. That is, the second discharge passage 534 is recessed with respect to the contact surface between the inner wall surface of the second valve body 514 and the valve spool 550 of the sphere so that the valve spool 550 of the sphere is located in the second position from the first position. When moved to the air and hydraulic oil (F) to guide the first discharge passage (532). In the first embodiment of the present invention, four second discharge passages 534 are arranged at intervals of 90 degrees, but at least two may be formed at equal intervals. For example, two second discharge passages 534 may be designed such that two are disposed at 180 degree intervals and five at three or 75 degree intervals at 120 degree intervals.

Next, the valve spool 550 is disposed inside the valve body 510, and the first position and the first position adjacent to the draw in and out flow path 520 according to the hydraulic oil F drawn into and out of the draw in and out flow path 520. It is reciprocated between the second positions adjacent to the discharge passage 532. The valve spool 550 according to the present invention has the shape of a sphere. The valve spool 550 of the sphere is accommodated in the receiving portion 516 formed in the second valve body 514. The outer surface of the valve spool 550 of the sphere is in contact with the inner wall surface of the second valve body 514, and formed a gap between the second discharge passage 534 formed in the inner wall surface of the second valve body 514. do. The valve spool 550 of the sphere is moved from the first position to the second position by the hydraulic force of the hydraulic oil F drawn into the withdrawal flow passage 520, wherein the hydraulic oil F and the air are discharged from the second discharge passage ( 534).

The elastic member 560 is disposed in the first discharge passage 532 formed in the valve body 510 to provide an elastic force so that the valve spool 550 of the sphere is reciprocated between the first position and the second position. In detail, the elastic member 560 is elastically biased so that the valve spool 550 of the sphere is moved from the second position adjacent to the first discharge passage 532 to the first position adjacent to the take-out passage 520. In detail, the elastic member 560 is configured to move the valve spool 550 of the sphere from the second position to the first position when the hydraulic oil F introduced into the valve body 510 is drawn out to the withdrawal passage 520. It provides an elastic force to the valve spool 550 of the sphere.

The throttling action part 580 is formed to have a clearance C between the valve body 510 and the valve spool 550 of a sphere, and throttles the hydraulic oil F which flows into the clearance C. The throttle action part 580 is formed in the clearance C in the area | region of the 2nd valve body 514 of the upstream side of the 1st discharge flow path 532 from which the hydraulic oil F and air are discharged in detail. . That is, as illustrated in FIG. 6, the throttling action part 580 is formed upstream of the first discharge passage 532 through which the hydraulic oil F and the air are discharged to throttle the hydraulic oil F and the air. The throttling action portion 580 throttles the air flowing from the second discharge passage 534 and the hydraulic oil F at the second position of the valve spool 550 of the sphere to guide the first discharge passage 532. In this way, the throttling unit 580 continuously discharges air and a very small amount of hydraulic oil F to the outside of the valve body 510.

In addition, the throttle action portion 580 has a different cross-sectional shape, respectively, as shown in FIGS. 7 and 8. As the shape of the throttle action portion 580 shown in FIG. 7 has a rectangular cross-sectional shape, the flow rate of the hydraulic oil F discharged is kept constant. On the other hand, the throttling action portion 580 shown in FIG. 8 has a triangular shape so that the bottom surface of the second valve body 514, that is, the surface of the second valve body 514 on which the throttling action portion 580 is formed. When processing, the size of the triangle is reduced, so the flow rate of the hydraulic oil (F) can be adjusted. Here, the shape of the throttle action portion 580 shown in Figs. 7 and 8 is not limited to the first and second embodiments of the present invention, but also applicable to the third and fourth embodiments described below. .

With this configuration, the operation of the air discharge valve assembly 500 according to the first and second embodiments of the present invention will be described below.

First, when the hydraulic oil F is supplied to the pressurized region inside the cylinder 300, the hydraulic oil F is introduced into the valve body 510 through the withdrawal passage 520 of the air discharge valve assembly 500. Hydraulic oil F introduced into the valve body 510 provides hydraulic pressure to the valve spool 550 of the sphere located in the first position.

Then, the valve spool 550 of the sphere is moved from the first position to the second position by the hydraulic force of the hydraulic oil (F), wherein the air and the hydraulic oil (F) is discharged first through the second discharge passage 534 Discharged into position. Here, the throttling action portion 580 disposed upstream of the first discharge passage 532 through which air and the hydraulic oil F flow, guides the air and hydraulic oil F to the first discharge passage 532. do. In detail, the throttling action portion 580 throttles the air and the very small amount of hydraulic oil F when the valve spool 550 of the sphere is positioned in the second position, and continuously guides the first discharge passage 532. In addition, the elastic member 560 is the valve spool 550 of the sphere located in the second position when the hydraulic oil (F) drawn into the inside of the valve body 510 is drawn out to the withdrawal flow passage 520 to the first position It provides an elastic force to the valve spool 550 of the sphere to move.

Third Embodiment

9 is a first cross-sectional view of the air discharge valve assembly according to the third embodiment of the present invention, FIG. 10 is a cross-sectional view of the VII-V line shown in FIG. 9, FIG. 11 is an enlarged cross-sectional view of region B shown in FIG. 12 is a second operation cross-sectional view of the air discharge valve assembly according to the third embodiment of the present invention, FIG. 13 is an enlarged cross-sectional view of region D shown in FIG. 12, and FIG. 14 is a IV-XIV shown in FIG. 12. It is a cross section of the line.

As shown in FIGS. 9 to 14, the valve assembly 500 for air discharge according to the third embodiment of the present invention includes a valve body 510, a draw in and out flow path 520, a discharge flow path 530, and a valve spool. 550 and throttle action 580. In addition, the air discharge valve assembly 500 according to the third embodiment of the present invention further includes an elastic member 560.

The valve body 510, the draw in and out flow path 520, the discharge flow path 530, the valve spool 550 and the elastic member 560 of the valve assembly 500 for air discharge according to the third embodiment of the present invention are Since the air discharge valve assembly 500 according to the first and second embodiments of the present invention has been described, a detailed description thereof will be omitted below. However, since the second discharge passage 534 of the discharge passage 530 of the third embodiment of the present invention is different from the second discharge passage 534 of the first and second embodiments, the second throttle action part 584 to be described later. ) Will be described in detail.

The throttle action part 580 of the air vent valve assembly 500 according to the third embodiment of the present invention includes a first throttle action part 582 and a second throttle action part 584. The first throttle action portion 582 is formed in the first gap C1 by notching in the region of the second valve body 514 on the upstream side of the first discharge passage 532 through which the hydraulic oil F and the air are discharged. And throttles the hydraulic oil F and air which flow into the 1st clearance C1. That is, the first throttle action portion 582 is provided in the same position as the throttle action portion 580 of the first embodiment of the present invention.

On the other hand, the second throttle action part 584 is formed of a plurality of second gaps C2 recessed in the second discharge passage 534 along the reciprocating movement direction of the valve spool 550 of the sphere, and thus the second gap ( Acts to throttle the hydraulic oil (F) flowing to C2). In detail, the second throttle action part 584 is formed to have a plurality of second clearances C2 in the second discharge passage 534 of the first and second embodiments of the present invention. Accordingly, the second discharge passage 534 has a shape different from those of the first and second embodiments of the present invention. Here, the second discharge passage 534 is formed corresponding to the number of arrangement of the second throttle action portion 584. For example, at least two second throttle action parts 584 may be formed at equal intervals, and the inner wall surface of the second valve body 514 in contact with the valve spool 550 of the sphere may be arranged along the circumferential direction. Since it may be formed continuously, the second discharge passage 534 is formed corresponding to the second throttle action 584.

The second throttling action part 584 provides the same pressure between the valve body 510 and the valve spool 550 of the sphere disposed with the second clearance C2 interposed therebetween, so that the second valve body 514 is inside. To prevent the eccentric movement of the valve spool 550 of the sphere to be reciprocated in. The second throttle action part 584 is formed of a plurality of second gaps C2 at regular intervals to sequentially lower the pressure along the flow direction of the hydraulic oil F to allow air and hydraulic oil to the first discharge passage 532. Guide (F).

On the other hand, the second throttle action portion 584 accommodates the foreign matter contained in the hydraulic oil (F) guided to the first discharge passage 532, between the second valve body 514 and the valve spool 550 of the sphere Prevents lubrication loss. In detail, foreign matter in the hydraulic oil F flowing to the second throttle action part 584 does not flow along the second gap C2 continuously along the flow direction and is received in the second throttle action part 584. Then, since foreign matters can be prevented from flowing between the second valve body 514 and the valve spool 550 of the sphere, a decrease in lubricating force between the second valve body 514 and the valve spool 550 of the sphere is prevented. It can prevent.

The first throttling action portion 582 and the second throttling action portion 584 of the third embodiment of the present invention are different from the throttling action portion 580 of the first and second embodiments of the present invention. ) And the hydraulic oil (F) is throttled firstly in the second throttle action 584 and secondly throttled in the first throttle action (582) to air into the first discharge passage (532). And discharge the hydraulic oil (F).

Looking at the operation of the air discharge valve assembly 500 according to the third embodiment of the present invention by such a configuration as follows.

Then, the valve spool 550 of the sphere is moved from the first position to the second position by the hydraulic force of the hydraulic oil (F), wherein the air and the hydraulic oil (F) is a second throttle formed in the second discharge passage 534 It is throttled by the action part 584 and flows into the 1st discharge flow path 532. Here, the first throttle action portion 582 disposed on the upstream side of the first discharge passage 532 through which air and hydraulic oil F flow is used to supply air and hydraulic oil F provided from the second throttle action portion 584. The throttling action leads to the first discharge passage 532.

In detail, the throttling action portion 580 throttles the air and the very small amount of hydraulic oil F when the valve spool 550 of the sphere is positioned in the second position, and continuously guides the first discharge passage 532. In addition, the elastic member 560 is the valve spool 550 of the sphere located in the second position when the hydraulic oil (F) drawn into the inside of the valve body 510 is drawn out to the withdrawal flow passage 520 to the first position It provides an elastic force to the valve spool 550 of the sphere to move.

Fourth Embodiment

15 is a first operation cross-sectional view of the air discharge valve assembly according to a fourth embodiment of the present invention, Figure 16 is a second operation cross-sectional view of the air discharge valve assembly according to a fourth embodiment of the present invention.

15 and 16, the air discharge valve assembly 500 according to the fourth embodiment of the present invention includes a valve body 510, a draw in and out flow path 520, a discharge flow path 530, and a valve spool. 550 and throttle action 580. In addition, the air discharge valve assembly 500 according to the third embodiment of the present invention further includes an elastic member 560. In addition, the air discharge valve assembly 500 according to the fourth embodiment of the present invention further includes an intermediate member 590 unlike the first to third embodiments.

Here, the valve body 510, the withdrawal flow passage 520, the discharge passage 530, the valve spool 550, the elastic member 560 of the air discharge valve assembly 500 according to the fourth embodiment of the present invention And the throttle action portion 580 is the same as the third embodiment of the present invention will be omitted below. Of course, the intermediate member 590 is described below to be applied to the air discharge valve assembly 500 according to the third embodiment of the present invention, the air discharge valve according to the first and second embodiments of the present invention Note that it may also be applied to the assembly 500.

The intermediate member 590 is disposed between the valve spool 550 and the elastic member 560 of the sphere. The intermediate member 590 is a valve spool of the sphere when the valve spool 550 of the sphere is moved from the first position adjacent to the withdrawal passage 520 to the second position adjacent to the first discharge passage 532. The hydraulic force provided to the 550 is provided to the elastic member 560. On the other hand, the intermediate member 590 provides an elastic force of the elastic member 560 to the valve spool 550 of the sphere when the valve spool 550 of the sphere is moved from the second position to the first position.

The intermediate member 590 has a lower hardness than the valve spool 550 and the elastic member 560 of the sphere. That is, the intermediate member 590 is provided with a material that is softer than the valve spool 550 and the elastic member 560 of the sphere. Thus, the intermediate member 590 is disposed between the valve spool 550 and the elastic member 560 of the sphere and made of a relatively soft material, to prevent damage to the valve spool 550 and the elastic member 560 of the sphere. It has an excellent effect.

Looking at the operation of the air discharge valve assembly 500 according to the fourth embodiment of the present invention by such a configuration as follows.

Then, the valve spool 550 of the sphere is moved from the first position to the second position by the hydraulic force of the hydraulic oil (F), the air and the hydraulic oil (F) is a second throttle action formed in the second discharge passage 534 It throttles by the part 584 and flows into the 1st discharge flow path 532. Here, the first throttle action portion 582 disposed on the upstream side of the first discharge passage 532 through which air and hydraulic oil F flow is used to supply air and hydraulic oil F provided from the second throttle action portion 584. The throttling action leads to the first discharge passage 532. At this time, the hydraulic force provided to the valve spool 550 of the sphere is provided to the elastic member 560 via the intermediate member 590.

In addition, the elastic member 560 is the valve spool 550 of the sphere located in the second position when the hydraulic oil (F) drawn into the inside of the valve body 510 is drawn out to the withdrawal flow passage 520 to the first position The elastic force is provided to the valve spool 550 of the sphere to move, wherein the elastic force of the elastic member 560 is provided to the valve spool 550 of the sphere via the intermediate member 590.

The intermediate member 590 is formed of a material having a lower hardness than the valve spool 550 and the elastic member 560 of the sphere when the valve spool 550 of the sphere is reciprocated between the first position and the second position. When the valve spool 550 and the elastic member 560 are in direct contact, damage to the valve spool 550 and the elastic member 560 of the sphere may be prevented.

Therefore, when the hydraulic oil is supplied to the pressure region of the cylinder, the valve spool of the sphere is moved, and the air and hydraulic oil can be continuously discharged using the throttling action, so that the sealing components such as sealing members due to the compression explosion of air, etc. are damaged. Prevention can improve operational reliability with extended life of sealing components.

In addition, the valve spool and the elastic member of the sphere between the valve spool and the elastic member of the sphere having a relatively lower hardness than the arrangement by placing the valve spool and the valve valve spool and elastic of the sphere when the reciprocating movement inside the valve body Damage to the member can be prevented, thereby improving the maintenance efficiency of the product.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. It will be understood that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Claims

A valve body having a withdrawal flow path through which hydraulic oil is drawn in and out, and a discharge flow path for discharging the hydraulic oil and air drawn into the withdrawal flow path outside;

A valve spool of a sphere disposed inside the valve body and reciprocating to selectively discharge air and hydraulic oil according to the hydraulic oil drawn in and out of the valve body;

And a throttling action portion formed to have a gap between the valve body and the valve spool of the sphere, and throttling hydraulic oil flowing into the gap.
The method of claim 1,

The discharge flow path,

A first discharge passage formed opposite to the discharge passage, for discharging hydraulic oil and air introduced into the valve body to the outside of the valve body;

An air discharge valve assembly formed between the take-out flow path and the first discharge flow path, the second discharge flow path guiding hydraulic oil and air drawn into the take-out flow path to the first discharge flow path; .
The method of claim 2,

The throttling action portion is formed by the gap in the valve body region upstream of the first discharge flow path through which hydraulic oil and air are discharged by notching, and throttles the hydraulic oil discharged to the first discharge flow path. An air discharge valve assembly.
The method of claim 2,

The throttle action portion,

A first throttling action portion formed by a notch in the valve body region on the upstream side of the first discharge passage through which the hydraulic oil and air are discharged, and throttling the hydraulic oil and air flowing into the first clearance passage. Wow;

And a second throttle action portion formed as a plurality of second recesses recessed in the second discharge passage along a reciprocating direction of the valve spool of the sphere to throttle hydraulic oil flowing into the second clearance. An air discharge valve assembly.
The method of claim 3, wherein

And said throttling action portion decreases the pressure along the flow direction of the hydraulic oil flowing into the gap, thereby guiding air and hydraulic oil to the first discharge passage.
The method of claim 4, wherein

The second throttle action part sequentially lowers the pressure along the flow direction of the hydraulic oil flowing into the second gap, thereby guiding air and hydraulic oil to the first throttle action part,

The first throttle action portion is guided from the second throttle action portion to drop the pressure along the flow direction of the hydraulic oil flowing to the first gap, the air characterized in that to guide the air and the hydraulic oil to the first discharge passage Discharge valve assembly.
The method of claim 6,

The second throttle action portion provides the same pressure between the valve body and the valve spool of the sphere disposed with the second clearance therebetween, thereby preventing eccentric movement of the valve spool of the sphere. Discharge valve assembly.
The method of claim 6,

And the second throttle action part accommodates foreign substances contained in the hydraulic oil guided to the first discharge passage, thereby preventing a decrease in lubricating force between the valve body and the valve spool of the sphere.
The method of claim 2,

The valve body,

A first valve body having the withdrawal flow path through which hydraulic oil is drawn in and out;

And a second valve body connected to the first valve body, wherein the first discharge channel and the second discharge channel are formed, and a receiving part is formed to receive the valve spool of the sphere. Assembly.
The method of claim 9,

The receiving portion has a shape corresponding to the cross-sectional shape of the valve spool of the sphere,

At least two second discharge passages are formed in the second valve body in the circumferential direction of the accommodating portion such that the valve spool of the sphere is adjacent to the first discharge passage and the first position adjacent to the withdrawal passage. Air discharge valve assembly, characterized in that for guiding air and hydraulic oil between the second position to the first discharge passage.
The method of claim 10,

And said second discharge passage is recessed in said second valve body in a reciprocating direction of movement between said first position and said second position of said valve spool of a sphere.
The method of claim 2,

The air discharge valve assembly,

And an elastic member disposed in the first discharge passage of the valve body and providing an elastic force to the valve spool of the sphere.
The method of claim 12,

The air discharge valve assembly,

Disposed between the valve spool of the sphere and the elastic member, the hydraulic force provided to the valve spool of the sphere when the valve spool of the sphere is moved to the first discharge passage by the hydraulic oil introduced into the withdrawal passage; And an intermediate member provided to the elastic member and providing the elastic force of the elastic member to the valve spool of the sphere when the hydraulic oil is discharged from the inside of the valve body to the draw in and out flow path.
The method of claim 13,

The intermediate member has a lower hardness than the valve spool and the elastic member of the sphere valve assembly for air.
A piston;

A cylinder accommodating the piston and having a hydraulic oil accommodating space through which hydraulic oil for reciprocating the piston is drawn out;

Claim 1 to 14 disposed in the piston along the reciprocating direction of the piston, the air discharge valve assembly of any one of claims 1 to 14 for discharging the air and hydraulic oil drawn into the cylinder Hydraulic actuator.