CN111336290B

CN111336290B - Safety valve

Info

Publication number: CN111336290B
Application number: CN201911310739.1A
Authority: CN
Inventors: 吴承焕; 黄景园
Original assignee: Joint Stock Co Motuole
Current assignee: Joint Stock Co Motuole
Priority date: 2018-12-19
Filing date: 2019-12-18
Publication date: 2022-08-09
Anticipated expiration: 2039-12-18
Also published as: KR20200076425A; KR102151124B1; CN111336290A

Abstract

The present invention relates to a safety valve that pressurizes an elastic member based on pressure of oil inside a case to adjust a relief pressure, the safety valve including: a plunger elastically supported by the elastic member and having a main plunger flow path formed therein so that oil flowing into the housing can move; the adjusting plug is hollow inside and is arranged on one side of the shell; and a piston disposed such that an inner peripheral surface thereof faces an outer peripheral surface of a region of the plunger, the region of the outer peripheral surface dividing an interior of the adjustment plug into a first chamber and a second chamber, and being moved by oil pressure or the elastic member.

Description

Safety valve

Technical Field

The present invention relates to a safety valve, and more particularly, to a safety valve that pressurizes an elastic member inside a case based on oil pressure to adjust a relief pressure.

Background

Generally, the relief valve performs an action of selectively communicating the flow paths based on a set pressure. The safety valve pressurizes the spring through a flow path formed inside by the pressure of the oil flowing into the inlet port, and communicates the inlet port with the outlet port based on a set pressure to communicate the flow path connected to the safety valve.

Such a relief valve may be provided in a device driven by hydraulic pressure and controlled to prevent the pressure in the hydraulic circuit from rising above a set pressure.

The conventional safety valve has a problem that the interior thereof is formed to have a complicated flow path. In this case, the precision of parts is required, and a precise process is also required in machining a flow passage formed in the safety valve.

The addition of such parts and the formation of a flow path in the safety valve by precision machining have a problem that the unit price of the valve itself increases. Further, it is difficult to control the quality of the flow path to be precisely machined or the like by adding parts.

Disclosure of Invention

Technical subject

The invention provides a safety valve capable of adjusting release pressure through a simple flow path.

Technical scheme

According to an embodiment of the present invention, there is provided a relief valve that pressurizes an elastic member based on pressure of oil inside a case to adjust a relief pressure, the relief valve including: a plunger elastically supported by the elastic member and having a main plunger flow path formed therein so that oil flowing into the housing can move; the adjusting plug is hollow inside and is arranged on one side of the shell; and a piston disposed such that an inner peripheral surface thereof faces an outer peripheral surface of a region of the plunger, the region of the outer peripheral surface dividing an interior of the adjustment plug into a first chamber and a second chamber, and being moved by oil pressure or the elastic member.

Further, the piston may include: a partitioning portion having a region that is formed to protrude so as to face an inner peripheral surface of the adjustment plug, and that partitions the first chamber and the second chamber; a regulation plug support part, which is provided with a piston communication hole in a mode of communicating the main plunger flow path and the first chamber; and an elastic member support portion formed to have an outer diameter relatively smaller than an outer diameter of the dividing portion, disposed to protrude from the adjustment plug, and capable of supporting the elastic member.

Further, the piston may further include: and a piston passage formed in a direction intersecting the longitudinal direction of the piston so that the main plunger passage and the second chamber can communicate with each other.

Further, the plunger may include: and a communicating plunger flow path formed in a region of the plunger in a direction intersecting a longitudinal direction of the piston so that the piston flow path and the main plunger flow path communicate with each other.

Further, the plunger may further include: and an oil storing region formed by recessing a region of the outer circumferential surface of the plunger in which the communicating plunger flow path is formed, to store oil.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the embodiment of the present invention, the relief valve can effectively maintain the relief pressure by a simple flow path structure.

Drawings

Fig. 1 shows a cross section of a safety valve of an embodiment of the present invention.

Fig. 2 to 4 show the operating state of fig. 1.

Description of the symbols

100: a housing, 101: safety valve, 400: adjusting plug, 410: first chamber, 420: second chamber, 500: elastic member, 600: plunger, 610: main plunger flow path, 630: communication plunger flow path, 640: oil storage area, 700: piston, 710: dividing section, 720: regulation plug support portion, 721: piston communication hole, 730: elastic member support portion, 740: a piston flow path.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can easily practice the invention. The invention may be embodied in many different forms and is not limited to the embodiments described herein.

It is noted that the drawings are diagrammatic and not to scale. Relative dimensions and proportions of parts shown in the figures have been shown exaggerated or reduced in size for the sake of clarity and convenience in the drawings, and any dimensions are exemplary only and not limiting. In addition, the same reference numerals are used for the same structures, elements or components appearing in two or more figures to represent similar features.

The embodiments of the present invention specifically show desirable embodiments of the present invention. As a result, various modifications of the illustration are expected. Thus, embodiments are not limited to the particular manner of area illustrated, but, for example, also include variations of the manner in which the manufacture is effected.

A safety valve 101 according to an embodiment of the present invention will be described with reference to fig. 1.

The relief valve 101 pressurizes the elastic member 500 based on the pressure of the oil inside the casing 100 to regulate the relief pressure.

As illustrated in fig. 1, the relief valve 101 of an embodiment of the present invention includes a plunger 600, a regulator plug 400, and a piston 700.

The plunger 600 is arranged inside the housing 100 so as to be long in one direction along the longitudinal direction of the housing 100. Further, the plunger 600 is supported by the elastic member 500. Further, inside the plunger 600, a main plunger flow path 610 is formed along the longitudinal direction of the plunger 600. The oil flowing into the interior of the housing 100 can move along the main plunger flow path 610. That is, the main plunger flow path 610 guides the movement of oil. The plunger 600 pressurizes the elastic member 500 based on the pressure of the oil passing through the main plunger flow path 610, and adjusts the relief pressure.

The regulation plug 400 is formed to have a hollow inside. In addition, an adjustment plug 400 is provided at one side of the housing 100.

The piston 700 is disposed such that an inner circumferential surface faces an outer circumferential surface of a region of the plunger 600, the region of the outer circumferential surface divides the inside of the adjustment plug 400 into the first chamber 410 and the second chamber 420, and is moved by oil pressure or the elastic member 500. Specifically, the first and

second chambers

410 and 420 may be formed on a same axis side by side in a length direction of the piston 700.

With such a structure, the relief valve 101 of an embodiment of the present invention can effectively adjust the relief pressure by a simple structure of guiding the movement of the oil to the first and

second chambers

410 and 420.

In addition, the piston 700 of the relief valve 101 according to an embodiment of the present invention may include a dividing portion 710, an adjustment plug support portion 720, and an elastic member support portion 730.

A region of the dividing part 710 may be convexly formed to face an inner circumferential surface of the regulation plug 400, and divide the first chamber 410 and the second chamber 420. Specifically, in the dividing portion 710, the outer diameter of the adjustment plug 400 may be formed to be expanded such that the outer circumferential surface of a region of the piston 700 is in contact with the inner circumferential surface of the adjustment plug 400. Thus, the partitioning part 710 may slidably move along the inner circumferential surface of the adjustment plug 400 in the longitudinal direction of the adjustment plug 400 to partition the first chamber 410 and the second chamber 420, and may also make the volumes of the first chamber 410 and the second chamber 420 variable.

The adjusting plug support portion 720 may be formed with a piston communication hole 721 to communicate the main plunger flow path 610 and the first chamber 410 with each other. Specifically, the adjusting plug support portion 720 may be formed at one end of the piston 700, and the outer circumferential surface of the piston 700 may be formed to be relatively smaller than the outer circumferential surface of the dividing portion 710. Further, one surface of the adjusting plug support portion 720 may be disposed to face one surface of the plug 300 provided at one side of the housing 100. That is, the adjusting plug support portion 720 may be formed to protrude toward one surface of the plug 300.

In addition, a piston communication hole 721 may be formed at an adjustment plug support portion 720 formed such that one end of the piston 700 protrudes toward the plug 300, and formed such that the inner circumferential surface of the piston 700 and the first chamber 410 communicate with each other. That is, the first chamber 410 may be defined as an area between a face of the plug 300 and the height of one end of the piston 700. In other words, the first chamber 410 may be a region between one surface of the plug 300 and a side surface of the partition 710 adjacent to the adjusting plug support portion 720 (one surface of the partition 710 facing the one surface of the plug 300).

For example, the piston communication hole 721 may be formed by opening an area of one end of the piston 700 facing the plug 300.

That is, the oil that has moved through the main plunger flow path 610 can move to the first chamber 410 through the piston communication hole 721 and the hollow portion at the open end of the piston 700. The oil moving through the main plunger flow path 610 moves the piston 700 and the plunger 600, and pressurizes the elastic member 500 to maintain the relief pressure.

The elastic member support portion 730 may be formed at the other side of the piston 700 in such a manner as to have a relatively smaller outer diameter than that of the partition portion 710. The elastic member support 730 may be disposed at the other end of the piston 700 to protrude from the adjustment plug 400. Specifically, the elastic member support portion 730 may be disposed at the other end of the piston 700 to protrude from the other end of the adjustment plug 400 formed to have a relatively smaller inner diameter than the hollow portion inside.

The elastic member support portion 730 thus disposed to protrude from the other end of the adjustment plug 400 may support the elastic member 500. Specifically, the spring plate 800 may be coupled to the elastic member support 730.

A spring serving as the elastic member 500 is disposed on the outer circumferential surface of the plunger 600, and the spring piece 800 can support such a spring.

Thus, the piston 700 may divide the first and

second chambers

410 and 420 and guide to supply oil to the first chamber 410.

In addition, the piston 700 of the relief valve 101 of an embodiment of the present invention may further include a piston flow path 740.

The piston flow path 740 may enable communication between the main plunger flow path 610 and the second chamber 420. Further, the piston flow path 740 may be formed in a direction crossing the longitudinal direction of the piston 700.

Specifically, the piston flow path 740 may be formed on an outer circumferential surface of the piston 700 facing the second chamber 420. Such a piston flow path 740 may communicate the main plunger flow path 610 and the second chamber 420. Thus, it is possible to guide the oil flowing in through the main plunger flow path 610 to be supplied to the second chamber 420, or to guide the oil stored in the second chamber 420 to be discharged through the main plunger flow path 610.

For example, the piston flow path 740 may be formed in a direction perpendicular to the central axis of the piston 700.

Thus, the piston flowpath 740 may effectively communicate the second chamber 420 with the main plunger flowpath 610.

For example, the piston flow path 740 may be an orifice.

Further, the plunger 600 of the relief valve 101 according to an embodiment of the present invention may include a communicating plunger flow path 630.

The communicating plunger flow path 630 may be formed in a region of the plunger 600 such that the piston flow path 740 and the main plunger flow path 610 communicate with each other. Further, the communicating plunger flow path 630 may be formed in a direction crossing the longitudinal direction of the piston 700.

The communication plunger flow path 630 may guide the oil flowing in through the main plunger flow path 610 to flow into the second chamber 420 through the piston flow path 740. Further, the central axes of the communicating plunger flow path 630 and the piston flow path 740 may be arranged in parallel with each other in accordance with the movement of the piston 700 or the plunger 600.

The communicating plunger flow path 630 may be formed in a region of the plunger 600 slidably supported on the inner circumferential surface of the piston 700. Specifically, the communicating plunger flow path 630 may be formed to face the piston flow path 740 in a direction perpendicular to the longitudinal direction of the plunger 600.

Accordingly, the communicating plunger flow path 630 may guide the oil flowing into the second chamber 420 through the main plunger flow path 610 to be communicated to the piston flow path 740 and the second chamber 420 without a member for an additional flow path or without complicating the structures of the piston 700 and the plunger 600.

For example, the communicating plunger flow path 630 may be an orifice.

Accordingly, the flow paths as the communicating plunger orifice for the communicating plunger flow path 630 and the piston orifice for the piston flow path 740 can be arranged side by side, and therefore, the moving time of the piston 700 can be secured. This can effectively reduce the shock acting on the relief valve 101.

In addition, the plunger 600 of the safety valve 101 according to an embodiment of the present invention may further include an oil reservoir region 640.

The oil storage region 640 may be formed by a region in which the outer circumferential surface of the plunger 600 communicating with the plunger flow path 630 is formed being depressed to store oil. The oil reservoir region 640 may be formed by the outer circumferential surface of the plunger 600 being depressed centering on the communicating plunger flow path 630 to store the oil having passed through the piston flow path 740 from the second chamber 420 and guide to be supplied to the communicating plunger flow path 630, or to store the oil when the oil having passed through the main plunger flow path 610 is supplied to the second chamber 420 through the piston flow path 740.

That is, even if the communication plunger flow path 630 and the piston flow path 740 are not located coaxially, it is possible to cause the oil passing through the communication plunger flow path 630 and the piston flow path 740 to be supplied to the second chamber 420 or the main plunger flow path 610.

Next, an operation of the safety valve 101 according to an embodiment of the present invention will be described with reference to fig. 1 to 4.

As illustrated in fig. 1, the relief valve 101 includes a housing 100, a plug 300, a regulation plug 400, a piston 700, a spring plate 800, an elastic member 500, a plunger 600, and a valve sheet 200.

A hollow-shaped regulation plug 400 is provided at one side of the case 100 formed in a hollow shape. Further, the other side of the case 100 is formed to be opened. Further, the valve sheet 200 may be provided at the other side of the housing 100, and the inflow port 110 may be formed at the center of the valve sheet 200. Further, an outlet port 120 is formed in the outer peripheral surface of the casing 100 adjacent to the other side of the casing 100.

Further, inside the housing 100, a plunger 600 is disposed along the longitudinal direction. The elastic member 500 is disposed on the outer peripheral surface of the plunger 600. The opening and closing of the inlet 110 and the outlet 120 can be controlled by the other side of the plunger 600.

The plunger orifice 620 may be formed in a region adjacent to the inflow port 110 in the main plunger flow path 610.

The plug 300 is provided at one side of the hollow-shaped regulation plug 400. A region of the piston 700 may be disposed at the other side of the hollow-shaped adjusting plug 400. Specifically, the adjusting plug support portion 720 and the dividing portion 710 may be disposed inside the other side of the adjusting plug 400.

As illustrated in fig. 2, the oil flows into the main plunger flow path 610 through the inflow port 110. At this time, the plunger 600 moves in a direction adjacent to the plug 300 by the pressure of the oil flowing in through the main plunger flow path 610, thereby pressurizing the elastic member 500.

Specifically, a region of one side of the plunger 600 slides along the inside of the piston 700 to move in a direction adjacent to the plug 300. Specifically, one end of the piston 700 is in a state of being supported by the plunger 600. At this time, the relief valve 101 is in a state of increasing the pressure up to 1 time.

As illustrated in fig. 3, the oil that has passed through the main plunger flow passage 610 moves to the first chamber 410 through the piston communication hole 721. The oil that has passed through the main plunger flow path 610 through the hollow portion of the piston 700 moves to the first chamber 410. Thus, the piston 700 moves in a direction in which the area of the first chamber 410 is widened.

Specifically, although the oil that has passed through the main plunger flow path 610 is also supplied to the second chamber 420 through the main plunger flow path 610 and through the communicating plunger flow path 630 and the piston flow path 740, the piston 700 moves in a direction away from the plug 300 because the amount supplied to the first chamber 410 is relatively large.

As the piston 700 moves in a direction in which the area of the first chamber 410 is widened, the plunger 600 also moves in a direction in which the other end of the plunger 600 is adjacent to the valve plate 200 by the same pressure. At this time, since the other end of the piston 700 is drawn out from the other end of the adjusting plug 400, the elastic member 500 can be pressurized.

Accordingly, the other end of the plunger 600 maintains a contact state with the valve sheet 200, and the relief valve 101 is raised to a set pressure.

As illustrated in fig. 4, the oil stored in the second chamber 420 flows into the main plunger flow path 610 through the piston flow path 740 and the communication plunger flow path 630. Further, such oil may be supplied to the first chamber 410.

The piston 700 moves in a direction in which the second chamber 420 becomes narrower, and the plunger 600 moves in a direction adjacent to the plug 300 by the pressure of the oil supplied to the main plunger flow path 610. That is, the piston 700 and the plunger 600 move in opposite directions.

As the second chamber 420 is narrowed, the oil stored in the second chamber 420 may be stored in the oil storage region 640, and the oil stored in the oil storage region 640 may be supplied to the main plunger flow path 610 through the communication plunger flow path 630. That is, even if the communication plunger flow path 630 and the piston flow path 740 are not coaxially located, the oil reservoir region 640 can effectively guide the movement of the oil stored in the oil reservoir region 640.

At this time, the spring piece connected to the other end of the piston 700 is pressed in the direction in which the piston 700 is compressed and moved, and the plunger 600 is moved in the direction in which the other side of the plunger 600 is separated from the valve sheet 200, so that the relief valve 101 maintains the set pressure.

As illustrated in fig. 1, when the pressure of the oil flowing into the main plunger flow path 610 through the inflow port 110 is released, the plunger 600 moves in a direction in which the other side of the plunger 600 is adjacent to the valve sheet 200 by the elastic force of the elastic member 500.

In addition, the piston 700 is also moved toward the plug 300 in a direction in which the area of the first chamber 410 is reduced by the elastic force of the elastic member 500. At this time, the oil remaining inside the relief valve 101 may be stored in the second chamber 420 through the communication plunger flow passage 630 and the piston flow passage 740.

With such a structure, the relief valve 101 of an embodiment of the present invention can effectively regulate the relief pressure through a simple internal flow path.

Although the embodiments of the present invention have been described above with reference to the drawings, it will be understood by those skilled in the art to which the present invention pertains that the present invention may be embodied in other specific forms without changing the technical idea or essential features of the present invention.

Therefore, the above-described embodiments should be construed in all aspects as illustrative and not restrictive, the scope of the present invention being indicated by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as falling within the scope of the present invention.

Claims

1. A safety valve that pressurizes an elastic member based on pressure of oil inside a case to regulate a relief pressure, the safety valve characterized by comprising:

a plunger elastically supported by the elastic member and having a main plunger flow path formed therein so that oil flowing into the housing can move;

the adjusting plug is hollow inside and is arranged on one side of the shell; and

a piston disposed such that an inner peripheral surface thereof faces an outer peripheral surface of a region of the plunger, the region of the outer peripheral surface dividing an interior of the adjusting plug into a first chamber and a second chamber and being moved by oil pressure or the elastic member,

the piston includes a piston flow path that is an orifice and is formed in a direction intersecting a longitudinal direction of the piston so that the main plunger flow path and the second chamber can communicate with each other,

the plunger includes:

a communicating plunger flow path which is an orifice and is formed in a region of the plunger such that a central axis of the communicating plunger flow path and a central axis of the piston flow path are arranged in parallel in such a manner that the piston flow path and the main plunger flow path communicate with each other; and

an oil reservoir region that is formed by recessing a region of the outer peripheral surface of the plunger in which the communicating plunger flow path is formed, the oil reservoir region storing oil to guide the oil stored in the second chamber to flow to the main plunger flow path through the piston flow path and the communicating plunger flow path even when the communicating plunger flow path is not coaxial with the central axis of the piston flow path.

2. The safety valve of claim 1,

the piston includes:

a partitioning portion having a region that is formed so as to protrude so as to face an inner peripheral surface of the adjuster plug, and that partitions the first chamber and the second chamber;

a regulation plug support part, which is provided with a piston communication hole in a mode of communicating the main plunger flow path and the first chamber; and

and an elastic member support portion formed to have an outer diameter relatively smaller than an outer diameter of the dividing portion, disposed to protrude from the adjustment plug, and capable of supporting the elastic member.