KR101739302B1 - Check valve for discharging air and hydraulic actuator for power plant having the same - Google Patents

Abstract

The present invention relates to an air discharging check valve for selectively discharging air and hydraulic oil, and to a power plant hydraulic actuator having the same. The air discharging check valve according to the present invention comprises: a valve body including an inlet and outlet flow path which hydraulic oil flows in and out and a discharge flow path in which air and hydraulic oil in accordance with the hydraulic oil fed into the inlet and outlet flow path are discharged to the outside; and a valve spool disposed in the valve body, and selectively discharging the air and hydraulic oil by reciprocating between a discharging position where the air and hydraulic oil are discharged according to the hydraulic oil which flows in and out the valve body and a blocking position where the discharge of the air and hydraulic oil is blocked. According to the present invention, the spherical valve spool can discharge air and hydraulic oil to the outside of the valve body while moving between the discharging position and the blocking position. Thus, damage caused by compression and explosion of air is prevented, and operation reliability of a piston can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a check valve for air discharge and a hydraulic actuator for a power plant having the check valve,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve for discharging air and a hydraulic actuator for a power plant having the check valve, and more particularly, to a check valve for discharging air and hydraulic oil selectively, and a hydraulic actuator for a power plant having the check valve.

Generally, a hydraulic actuator is composed of a cylinder and a piston, and is a device that provides a driving force to the piston in accordance with the hydraulic pressure of the hydraulic oil drawn in and out of the cylinder. The hydraulic actuator is mainly a linear type in which the reciprocating movement of the piston is provided by providing the linear movement force of the piston.

Here, the hydraulic actuator is used for opening and closing a valve connected to a piston, or widely used in various industrial fields for providing motion force to an object connected to the piston. For example, hydraulic actuators are widely used in a variety of fields such as construction machinery and power plants.

Such a hydraulic actuator reciprocates the piston in accordance with the hydraulic pressure of the hydraulic oil drawn in and out of the cylinder, as described above. On the other hand, when the hydraulic fluid is supplied to the cylinder of the hydraulic actuator, the air contained in the hydraulic fluid and the air existing in the cylinder in the pressurized region can be compressed and exploded.

However, in the conventional hydraulic actuator, as described above, when the hydraulic oil is supplied to the inside of the cylinder and the air is compressed and exploded in the pressing region, the sealing member of the piston may be damaged, The operating reliability of the hydraulic actuator is deteriorated.

Particularly, a hydraulic actuator for a power plant used in a power plant has a problem that reliability of operation of the turbine may be affected when operating reliability is generated due to compression and explosion of air in a pressurized region inside the cylinder as described above.

Korean Patent Registration No. 10-0941373; Hydraulic actuator for power plant and its maintenance method

SUMMARY OF THE INVENTION It is an object of the present invention to provide a check valve for air discharge with improved structure so that air in a pressurized region of a piston supplied with hydraulic oil can be discharged to a negative pressure region and a hydraulic actuator for a power plant having the check valve.

It is another object of the present invention to provide a hydraulic actuator for a power plant having an improved check valve for air discharge so that air in a pressurized region of a piston supplied with hydraulic oil can be discharged to a negative pressure region.

According to an aspect of the present invention, there is provided a hydraulic control apparatus for an internal combustion engine, comprising: a valve body having an inlet / outlet passage through which hydraulic oil is drawn out and inward and an exhausting passage for discharging air and hydraulic oil according to hydraulic oil drawn into the inlet / Which is reciprocated between a discharge position for discharging the air and the hydraulic oil discharged from the valve body and a cutoff position for shutting off the discharge of the hydraulic oil, and a valve for selectively discharging the air and the hydraulic oil, And a check valve for air discharge, characterized by comprising a spool.

A first discharge flow passage formed opposite to the discharge flow passage and configured to discharge air and hydraulic fluid from the discharge position of the valve spool on the sphere and to prevent discharge of air and hydraulic fluid from the discharge position, And a second discharge passage formed between the inlet passage and the first discharge passage for guiding air and hydraulic oil to the first discharge passage between the discharge position and the blocking position of the valve spool on the sphere.

Wherein the valve body has a first valve body formed with the outflow inlet passage through which hydraulic fluid is drawn out and connected to the first valve body and the first discharge passage and the second exhaust passage are formed, And a second valve body on which the accommodating portion is formed.

Wherein the accommodating portion has a shape corresponding to a cross-sectional shape of the valve spool of the sphere, and the second discharge passage is recessed in the second valve body in the circumferential direction of the accommodation portion, And to guide the air and the hydraulic oil to the first discharge passage between the first and second shutoff positions.

The second discharge passage may be formed in the second valve body along the reciprocating direction between the discharge position and the blocking position of the valve spool of the sphere.

The air discharge check valve further includes an elastic member disposed in the first discharge passage of the valve body to provide an elastic force such that the valve spool of the spherical body is reciprocated between the discharge position and the cutoff position .

Preferably, the resilient member may be elastically biased such that the valve spool of the sphere is moved from the interruption position to the discharge position.

Wherein the outflow inlet passage is formed in the first valve body and includes a first outflow inlet passage for supplying oil pressure to the valve spool of the sphere when the hydraulic oil is drawn in, And a second inlet / outlet flow path formed in the body and contacting the spherical portion of the sphere with the valve spool is notched to guide the hydraulic fluid to the receiving portion when the hydraulic oil is drawn.

In addition, the air discharge check valve is disposed between the valve spool and the resilient member of the sphere so that the fluid pressure provided to the valve spool of the sphere when the valve spool of the sphere is moved from the discharge position to the shut- And an intermediate member which is provided to the elastic member and provides the elastic force of the elastic member to the valve spool of the sphere when the valve spool of the sphere is moved from the blocking position to the discharge position.

The outer side surface of the intermediate member may be provided with a lubricating force providing portion for receiving hydraulic oil and providing lubrication between the valve body and the contact surface of the valve body.

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

According to another aspect of the present invention, there is provided a hydraulic control apparatus for an internal combustion engine according to the present invention, comprising: a piston; a cylinder in which a hydraulic oil receiving space accommodating the piston and reciprocating the hydraulic oil is drawn and received; And a check valve for discharging the air of the above-described configuration, which is disposed in the piston and selectively discharges the air and hydraulic oil introduced into the cylinder, is also made by the hydraulic actuator for a power plant.

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

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

First, since the valve spool of the sphere moves between the discharge position and the shutoff position, air and hydraulic oil can be discharged to the outside of the valve body, thereby preventing damage due to air compression and explosion, thereby improving operating reliability.

Second, when the valve spool of the sphere is reciprocated between the discharge position and the blocking position by disposing an intermediate member between the valve spool of the sphere and the elastic member with a relatively low hardness relative to the valve spool of the sphere and the elastic member, The spool and the elastic member can be prevented from being damaged.

Third, by providing a lubricating force providing member for containing hydraulic oil in the intermediate member, lubricating force is provided when the intermediate member is reciprocated, thereby improving the operating reliability of the air discharge check valve.

1 is a sectional view of a hydraulic actuator for a power plant according to an embodiment of the present invention,
2 is a first operational view of an air discharge check valve according to a first embodiment of the present invention;
3 is a sectional view taken along the line III-III shown in Fig. 2,
4 is a second operational view of an air discharge check valve according to a first embodiment of the present invention;
5 is a first operational view of an air discharge check valve according to a second embodiment of the present invention;
6 is a second operational view of an air discharge check valve according to a second embodiment of the present invention;
Fig. 7 is an enlarged view of the area A shown in Fig. 6,
8 is a first operational view of an air discharge check valve according to a third embodiment of the present invention;
9 is a second operational view of an air discharge check valve according to a third embodiment of the present invention;
10 is an enlarged view of the area B shown in Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an air discharge check valve and a hydraulic actuator for a power plant according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, it should be noted that the check valve for air discharge according to the embodiment of the present invention can be applied to various hydraulic devices such as the industrial machinery field in addition to the hydraulic actuator for a power plant described below.

It should be noted that the check valves for air discharge according to the first to third embodiments of the present invention are denoted by the same reference numerals for the same names.

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

1, a hydraulic actuator 10 for a power plant according to embodiments of the present invention includes a piston 100, a cylinder 300, and a check valve 500 for discharging air. In addition, the hydraulic actuator 10 for a power plant according to the embodiments of the present invention further includes a hydraulic oil storage part 400. [

The piston 100 is connected to a turbine valve not shown in the present invention. The piston 100 is disposed inside the cylinder 300 and reciprocates according to the hydraulic oil drawn in and out of the cylinder 300. The piston (100) divides the inside of the cylinder (300) into a pressurized region in which hydraulic pressure is provided by hydraulic oil and a negative pressure region in which no hydraulic pressure is provided. In the embodiments of the present invention, the hydraulic actuator 10 for a single-acting-type power plant is described. In the hydraulic actuator 10 for a double-acting power plant, the piston 100 permanently separates the pressurized region and the negative- The pressure region and the negative pressure region can be alternately replaced by reference.

The cylinder (300) receives the piston (100). As described above, the interior of the cylinder 300 is divided into a pressurized region where the oil pressure is provided by the piston 100 and a negative pressure region where no oil pressure is provided. Hydraulic oil is supplied to the pressure region inside the cylinder 300 to supply the hydraulic pressure to the piston 100.

The air discharge check valve 500 is disposed in the piston. The air discharge check valve 500 will be described in detail in the first to third embodiments to be described later.

The hydraulic oil storage part 400 is arranged to store and supply the hydraulic oil drawn in and out of the cylinder 300.

≪ Embodiment 1 >

3 is a sectional view taken along the line III-III shown in Fig. 2, and Fig. 4 is a sectional view taken along the line A-A in Fig. 2 according to the first embodiment of the present invention. Fig. 2 is a second operational view of an air discharge check valve; Fig.

2 to 4, an air discharge check valve 500 according to the first embodiment of the present invention includes a valve body 510, a take-out inlet passage 530, a discharge passage 540, (560). Also, the check valve 500 for discharging air according to the first embodiment of the present invention further includes an elastic member 570.

A valve body (510) is disposed in the piston (100). The valve body 510 is provided with an outlet flow passage 530 through which hydraulic oil F is drawn out and a discharge flow passage 530 through which air sucked in the hydraulic oil F drawn into the inlet and outlet flow passage 530 and hydraulic oil F are discharged to the outside 540 are formed. The valve body 510 includes a first valve body 512, a second valve body 514, and a receiving portion 516, as one embodiment of the present invention. The first valve body 512 is formed with an inlet / outlet passage 530 through which hydraulic oil F is drawn / received. The second valve body 514 is connected to the first valve body 512 and the second valve body 514 is provided with hydraulic oil F flowing into the outflow passage 530 formed in the first valve body 512 And a discharge passage 540 for discharging the gas to the outside of the valve body 510 is formed. The receiving portion 516 is formed in the interior of the second valve body 514 to receive the valve spool 560 of the sphere. In detail, the receiving portion 516 forms a space in which the valve spool 560 of the sphere is reciprocated between the discharge position and the blocking position.

The outflow channel 530 is formed in the first valve body 512 as described above. The outflow inlet passage 530 communicates with a pressurized region inside the cylinder 300 and draws out hydraulic oil F that is drawn into and out of the pressurized region. The hydraulic oil F flowing through the take-out inlet passage 530 provides oil pressure to the valve spool 560 of the sphere.

The discharge passage 540 guides the air contained in the hydraulic fluid F and the hydraulic fluid F flowing into the take-out inlet passage 530 to the outside of the valve body 510. The discharge passage 540 guides the air present in the pressing region of the cylinder 300 together with the hydraulic oil F to the outside of the valve body 510 together. In one embodiment of the present invention, the discharge passage 540 includes a first discharge passage 542 and a second discharge passage 544.

The first discharge passage 542 is formed opposite to the take-out inlet passage 530 to discharge the air and the hydraulic oil F to the outside of the valve body 510. The first discharge flow passage 542 discharges air and hydraulic oil F at the discharge position of the valve spool 560 of the sphere and the air and the hydraulic oil F discharged to the first discharge flow passage 542 are discharged through a valve spool (560).

The second discharge flow passage 544 is formed between the take-out inlet flow passage 530 and the first discharge flow passage 542 so that air and hydraulic oil F are supplied between the discharge position and the shut- 1 discharging flow path 542, as shown in Fig. The second discharge flow passage 544 is recessed into the second valve body 514 along the reciprocating direction between the discharge position and the shutoff position of the valve spool 560 of the sphere. 3, the second exhaust passage 544 is recessed along the circumferential direction of the second valve body 514, and four exhaust passages 544 are disposed at intervals of 90 degrees in one embodiment. That is, the second discharge flow passage 544 is recessed with respect to the inner wall surface of the second valve body 514 and the contact surface of the spherical valve spool 560 so that the spherical valve spool 560 moves And guides the air and the hydraulic oil F to the first discharge flow passage 542. [ In an embodiment of the present invention, the second discharge flow paths 544 are formed at intervals of 90 degrees and four, but at least two of the second discharge flow paths 544 may be equally spaced. For example, at least two second discharge flow paths 544 are formed at intervals of 180 degrees, that is, two are formed, three are formed at intervals of 120 degrees, and five are formed at intervals of 75 degrees.

The valve spool 560 is disposed inside the valve body 510 and is connected to a discharge position for discharging the air and the hydraulic oil in accordance with the hydraulic oil F drawn out to the valve body 510, And shutting off the discharge of the hydraulic oil F to the outside. The valve spool 560 of the present invention has the shape of a sphere. The valve spool 560 of the sphere is received in the second valve body 514, that is, the receiving portion 516. The outer surface of the valve spool 560 of the sphere is in contact with the inner wall surface of the second valve body 514. The hydraulic fluid F flowing into the outflow inlet passage 530 provides oil pressure to the lower surface of the valve spool 560 and the air and the hydraulic oil F are supplied to the inner wall surface of the second valve body 514, To the second discharge flow path 544 formed between the valve spool 560 of the valve body 560. [

The elastic member 570 is disposed in the first discharge flow passage 542 formed in the valve body 510 so as to provide elastic force such that the specific valve spool 560 reciprocates between the discharge position and the shutoff position. The elastic member 570 is elastically biased to move from the blocking position to the discharge position where the valve spool 560 of the sphere is prevented from discharging air and hydraulic oil F out of the valve body 510. Specifically, the elastic member 570 moves the valve spool 560 from the discharge position to the shutoff position by the hydraulic oil F flowing into the take-out inlet flow path 530, and then, through the take-out inlet flow path 530, The valve spool 560 of the sphere of the blocking position is moved to the discharge position when the valve F is released.

The operation of the air discharge check valve 500 according to the first embodiment of the present invention will be described below.

First, when hydraulic oil F is supplied to the pressurized area inside the cylinder 300, hydraulic oil is supplied to the take-out inlet passage 530 of the air discharge check valve 500. The hydraulic oil F supplied to the take-out inlet passage 530 provides oil pressure to the valve spool 560 of the ball positioned in the discharge position.

The valve spool 560 of the sphere is then moved from the discharge position to the shutoff position by the hydraulic pressure of the hydraulic oil F and the air and the hydraulic oil F are guided to the second discharge flow path 544, (Not shown). When the valve spool 560 of the sphere is positioned at the cut-off position, the air discharged to the first discharge passage 542 and the hydraulic oil F are blocked.

≪ Embodiment 2 >

FIG. 5 is a first operational view of an air discharge check valve according to a second embodiment of the present invention, FIG. 6 is a second operational view of an air discharge check valve according to a second embodiment of the present invention, and FIG. 6 is an enlarged view of the area A shown in Fig. 6. Fig.

5 to 7, the check valve 500 for discharging air according to the second embodiment of the present invention includes a valve body 510, a take-out inlet passage 530, a discharge passage 540, An elastic member 570, and an intermediate member 590. [

The valve body 510, the discharge passage 540, the valve spool 560 and the elastic member 570 of the air discharge check valve 500 according to the second embodiment of the present invention are similar to the first embodiment of the present invention And the detailed description thereof will be omitted.

The outflow inlet passage 530 of the second embodiment of the present invention includes a first outflow inlet passage 532 and a second outflow inlet passage 534. [ The first inlet and outlet flow path 532 is formed in the first valve body 512 and provides fluid pressure to the valve spool 560 of the sphere when hydraulic oil F is introduced. The second inlet / outlet flow path 534 is recessed in the first valve body 512 in the circumferential direction of the first inlet / outlet flow path 532, and the second inlet / outlet flow path 534 ) Are notched (N). The second take-out inlet flow path 534 is notched N and guides the hydraulic oil F to the receiving portion 516 when the hydraulic oil F is drawn. The second inlet / outlet flow path 534 can guide the air and the hydraulic oil F to the second discharge flow path 544 more quickly than the first embodiment of the present invention.

The intermediate member 590 is disposed between the valve spool 560 of the sphere and the elastic member 570. The intermediate member 590 provides the hydraulic pressure provided to the specific valve spool 560 to the elastic member 570 when the valve spool 560 of the sphere is moved from the discharge position to the blocking position. On the other hand, the intermediate member 590 provides the elastic force of the elastic member 570 to the specific valve spool 560 when the valve spool 560 of the sphere is moved from the blocking position to the discharge position. The intermediate member 590 has a lower hardness than the valve spool 560 of the sphere and the elastic member 570. That is, the intermediate member 590 is made of a soft material in contrast to the valve spool 560 and the elastic member 570 of the sphere. The intermediate member 590 is disposed between the valve spool 560 and the elastic member 570 and is made of a relatively soft material so as to prevent damage to the valve spool 560 and the elastic member 570 There are advantages to be able to.

Hereinafter, the operation of the air discharge check valve 500 according to the second embodiment of the present invention will be described.

First, when hydraulic oil F is supplied to the pressurized region inside the cylinder 300, hydraulic oil F is supplied to the outflow inlet passage 530 of the air discharge check valve 500. The hydraulic fluid F is supplied to the first inlet and outlet flow path 532 and the second inlet and outlet flow path 534 respectively and the air and the hydraulic fluid F flowing into the second inlet and outlet flow path 534 are supplied to the second discharge flow path 544. The hydraulic oil F flowing into the first inlet / outlet passage 532 and the second inlet / outlet passage 534 provides oil pressure to the valve spool 560 of the sphere located at the discharge position.

The valve spool 560 of the sphere is then moved from the discharge position to the shutoff position by the hydraulic pressure of the hydraulic oil F and the air and the hydraulic oil F are guided to the second discharge flow path 544, (Not shown). When the valve spool 560 of the sphere is positioned at the cut-off position, the air discharged to the first discharge passage 542 and the hydraulic oil F are blocked. Here, when the spherical valve spool 560 is moved between the discharge position and the shutoff position, the mediating member 590 disposed between the spherical valve spool 560 and the elastic member 570 is engaged with the spherical valve spool 560 The valve spool 560 and the elastic member 570 can be prevented from being damaged.

≪ Third Embodiment >

FIG. 8 is a first operation diagram of an air discharge check valve according to a third embodiment of the present invention, FIG. 9 is a second operation diagram of an air discharge check valve according to the third embodiment of the present invention, and FIG. 10 9 is an enlarged view of the area B shown in Fig.

8 to 10, an air discharge check valve 500 according to a third embodiment of the present invention includes a valve body 510, a take-out inlet passage 530, a discharge passage 540, An elastic member 570, and an intermediate member 590. [

The valve body 510, the discharge passage 540, the valve spool 560, and the elastic member 570 of the air discharge check valve 500 according to the third embodiment of the present invention are similar to the first embodiment of the present invention And the detailed description thereof will be omitted. In addition, since the outflow inlet passage 530 of the air discharge check valve 500 according to the third embodiment of the present invention has been described in the second embodiment of the present invention, detailed description thereof will be omitted below.

The intermediate member 590 of the third embodiment of the present invention is disposed between the specific valve spool 560 and the elastic member 570 like the intermediate member 590 of the second embodiment of the present invention. The intermediate member 590 provides the hydraulic pressure provided to the specific valve spool 560 to the elastic member 570 when the valve spool 560 of the sphere is moved from the discharge position to the blocking position. The intermediate member 590 provides the elastic force of the elastic member 570 to the specific valve spool 560 when the valve spool 560 of the sphere is moved from the blocking position to the discharge position. The intermediate member 590 has a lower hardness than the valve spool 560 of the sphere and the elastic member 570. That is, the intermediate member 590 is made of a soft material in contrast to the valve spool 560 and the elastic member 570 of the sphere.

The intermediate member 590 of the third embodiment of the present invention includes the intermediate member body 592 and the lubrication providing member 594. The intermediate member body 592 is in contact with the inner wall surface of the second valve body 514, unlike the intermediate member 590 of the second embodiment of the present invention. The intermediate member body 592 contacts the inner wall surface of the second valve body 514 to prevent eccentric movement when the sphere spool valve 560 reciprocates between the discharge position and the shutoff position.

The lubrication force applying unit 594 is disposed at a predetermined interval in the intermediate member body 592. The lubrication force applying unit 594 is disposed in a plurality of positions along the reciprocating direction of the intermediate member body 592. [ The lubrication force supplier 594 receives the hydraulic oil F flowing into the first discharge passage 542. The lubricant supplier 594 receives the hydraulic oil F and provides lubrication between the intermediate member body 592 and the second valve body 514.

The operation of the air discharge check valve 500 according to the third embodiment of the present invention will be described below.

First, when hydraulic oil F is supplied to the pressurized region inside the cylinder 300, hydraulic oil F is supplied to the outflow inlet passage 530 of the air discharge check valve 500. The hydraulic fluid F is supplied to the first inlet and outlet flow path 532 and the second inlet and outlet flow path 534 respectively and the air and the hydraulic fluid F flowing into the second inlet and outlet flow path 534 are supplied to the second discharge flow path 544. The hydraulic oil F flowing into the first inlet / outlet passage 532 and the second inlet / outlet passage 534 provides oil pressure to the valve spool 560 of the sphere located at the discharge position.

The valve spool 560 of the sphere is then moved from the discharge position to the shutoff position by the hydraulic pressure of the hydraulic oil F and the air and the hydraulic oil F are guided to the second discharge flow path 544, (Not shown). When the valve spool 560 of the sphere is positioned at the cut-off position, the air discharged to the first discharge passage 542 and the hydraulic oil F are blocked. Here, when the spherical valve spool 560 is moved between the discharge position and the shutoff position, the mediating member 590 disposed between the spherical valve spool 560 and the elastic member 570 is engaged with the spherical valve spool 560 The valve spool 560 and the elastic member 570 can be prevented from being damaged.

Further, the intermediate member body 592 comes into contact with the inner wall surface of the second valve body 514 to prevent eccentric movement. The intermediate member body 592 is provided with a lubricating force supplying member 594 for receiving hydraulic oil to provide lubrication between the second valve body 514 and the intermediate member body 592.

Accordingly, since the valve spool of the sphere can move between the discharge position and the shutoff position, air and hydraulic oil can be discharged to the outside of the valve body, thereby preventing damage due to compression and explosion of the air, thereby improving the operational reliability of the piston.

Further, when the valve spool of the sphere is reciprocated between the discharge position and the blocking position by disposing an intermediary member having a relatively low hardness as compared with the valve spool of the sphere and the elastic member between the valve spool and the elastic member of the sphere, The spool and the elastic member can be prevented from being damaged.

In addition, by providing a lubricating force providing member for accommodating hydraulic fluid in the intermediate member, lubricating force is provided when the intermediate member is reciprocated, thereby improving the operating reliability of the air discharge check valve.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, . Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

500: check valve for air discharge 510: valve body
512: first valve body 514: second valve body
516: accommodating portion 530:
532: First take-out inlet flow path 534: Second take-out inlet flow path
540: exhaust passage 542: first exhaust passage
544: second exhaust passage 560: valve spool
570: elastic member 590: intermediate member
592: intermediate member body 594: lubricant supply unit

Claims (12)

A valve body having an outlet passage through which hydraulic oil is drawn out and an outlet passage through which air and hydraulic oil are discharged to the outside;
The valve body is reciprocated between a discharge position for discharging the air and the hydraulic oil in accordance with the hydraulic oil drawn in and out of the valve body and a cutoff position for blocking the discharge of the hydraulic oil from the air, And a valve spool of a sphere to be discharged,
Wherein the discharge flow path is formed so as to face the take-out inlet flow path so that air and hydraulic oil are discharged from the discharge position of the valve spool on the sphere and the discharge of air and hydraulic oil from the discharge position is blocked, And a second discharge passage formed between the discharge position of the valve spool on the sphere and the shutoff position and guiding air and hydraulic oil to the first discharge passage formed between the first discharge passage and the first discharge passage,
Wherein the valve body is connected to a first valve body and a first valve body through which the hydraulic oil is drawn out and into which the outflow inlet passage is formed and the first discharge passage and the second discharge passage are formed, And a second valve body on which a receiving portion is formed,
Wherein the outflow inlet passage is formed in the first valve body and has a first outflow inlet passage for supplying oil pressure to the valve spool of the sphere when the hydraulic oil is drawn in and a second outflow inlet passage provided in the first valve body And a second outflow passage for guiding the hydraulic oil to the receiving portion when the hydraulic oil is drawn in a region where the spherical portion of the sphere is in contact with the valve spool is notched.
delete delete The method according to claim 1,
The receiving portion having a circular cross-sectional shape corresponding to the circular cross-sectional shape of the valve spool of the sphere,
Wherein at least two of the second discharge flow paths are recessed in the second valve body in the circumferential direction of the accommodation portion so as to guide air and hydraulic oil to the first discharge flow path between the discharge position and the shutoff position of the valve spool And a check valve for exhausting air.
5. The method of claim 4,
Wherein the second discharge passage is recessed in the second valve body along a reciprocating direction between the discharge position and the shutoff position of the valve spool of the sphere.
The method according to claim 1,
The check valve for air discharge,
Further comprising an elastic member which is disposed in the first discharge passage of the valve body and provides an elastic force so that the valve spool of the sphere is reciprocated between the discharge position and the cutoff position, .
The method according to claim 6,
Wherein said elastic member is elastically biased such that said valve spool of said sphere is moved from said blocking position to said discharge position.
delete The method according to claim 6,
The check valve for air discharge,
Wherein the valve spool is disposed between the valve spool and the elastic member of the sphere so as to provide a fluid pressure to the elastic member provided on the valve spool of the sphere when the valve spool of the sphere is moved from the discharge position to the blocking position, Further comprising an intermediate member for providing the elastic force of the elastic member to the valve spool of the sphere when the valve spool is moved from the blocking position to the discharging position.
10. The method of claim 9,
Wherein the outer side surface of the intermediate member is provided with a lubricating force providing portion for receiving hydraulic oil and providing a lubrication force between the valve body and the contact surface of the valve body.
10. The method of claim 9,
Wherein the intermediate member has a lower hardness than the valve spool and the elastic member of the sphere.
A piston;
A cylinder accommodating the piston and having a hydraulic oil receiving space through which the hydraulic oil for reciprocating the piston is drawn out;
A piston disposed in the piston along the reciprocating direction of the piston for selectively discharging air and hydraulic fluid introduced into the cylinder; And a check valve for air discharge.

Images