CN111911474A

CN111911474A - Gasket pressure regulating overflow valve

Info

Publication number: CN111911474A
Application number: CN202010621960.5A
Authority: CN
Inventors: 姚晓峰; 左超杰
Original assignee: Suzhou Yuanshang Precision Machinery Co ltd
Current assignee: Suzhou Yuanshang Precision Machinery Co ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-11-10

Abstract

The invention discloses a gasket pressure-regulating overflow valve, wherein a valve seat and a plug are respectively arranged at two ends of a sleeve, a valve core and an elastic member are accommodated in the sleeve, the sleeve is in clearance fit with the plug, the gasket is arranged on the valve core, two ends of the elastic member are respectively abutted against the gasket and the plug, a pressure-bearing surface is abutted against an abutting part to disconnect an oil inlet and an oil outlet, the valve core is provided with an oil through hole, the sleeve is provided with an oil drain hole, oil entering from the oil inlet firstly flows to the oil drain hole through the oil through hole and then presses the valve core, the whole process generates the response time of the overflow valve, the sudden impact of a liquid medium on the overflow valve is weakened to play a role in shock absorption, the length of the response time is realized by the size of the diameter of the oil through hole and the oil drain hole, after the elastic force of the elastic member is larger than, the take-off pressure can be adjusted by only disassembling the sleeve and the plug and replacing gaskets with different thicknesses.

Description

Gasket pressure regulating overflow valve

Technical Field

The invention relates to an overflow valve, in particular to a gasket pressure regulating overflow valve.

Background

The overflow valve is a hydraulic pressure control valve, and mainly plays the roles of constant pressure overflow, pressure stabilization, system unloading and safety protection in hydraulic equipment. In a fixed displacement pump throttling regulation system, a fixed displacement pump provides a constant flow. As system pressure increases, the flow demand decreases. At the moment, the overflow valve is opened, so that redundant flow overflows back to the oil tank, and the inlet pressure of the overflow valve, namely the outlet pressure of the pump is constant (the valve port is opened along with pressure fluctuation).

The same type product on the existing market needs to rely on an assembler to rotate a force application rod or a monkey wrench to zoom a spring and adjust the valve take-off pressure if the pressure of an overflow valve is regulated. The method occupies a large space and wastes time and labor when being implemented; under the condition of high setting pressure, the valve clack in the valve body rotates along with the valve body to strain a sealing surface; during pressure regulation, the spring can generate torsion force and even twist, so that the valve sealing force is deflected to cause valve leakage.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the gasket pressure regulating overflow valve which is simple to operate and does not damage the overflow valve during pressure regulation.

The purpose of the invention is realized by adopting the following technical scheme:

a gasket pressure regulating overflow valve comprises a valve seat, a valve core, an elastic part, a sleeve and a plug, wherein the valve seat and the plug are respectively arranged at two ends of the sleeve, the valve core and the elastic part are accommodated in the sleeve, the valve seat is provided with an oil inlet, the sleeve is provided with an oil outlet, the sleeve is in clearance fit with the plug, the gasket is arranged on the valve core, two ends of the elastic part are respectively abutted against the gasket and the plug, the valve seat is provided with an abutting part, the valve core is provided with a pressure bearing surface, the pressure bearing surface is abutted against the abutting part to disconnect the oil inlet and the oil outlet, the valve core is provided with an oil passing hole, the sleeve is provided with an oil drainage hole, the oil passing hole is communicated with the oil inlet and the oil drainage hole, oil entering from the oil inlet flows to the oil drainage hole through the oil passing hole, and then, applying pressure to the valve core, wherein after the pressure is greater than the elastic force of the elastic piece, the valve core moves to enable the oil inlet to be communicated with the oil outlet.

Further, the gasket pressure regulating overflow valve further comprises a piston, the piston is slidably mounted in the sleeve, the piston and the sleeve form a cavity, the oil drainage hole is communicated with the cavity, oil flowing out of the oil drainage hole pushes the piston to move along the sleeve, after the piston moves to a specified position, the cavity is shaped, and the oil drainage hole is sealed.

Further, the gasket pressure regulating overflow valve further comprises a sealing assembly, the sleeve is provided with a sealing groove, and the sealing assembly is located in the sealing groove and is in contact with the inner wall of the piston to seal the cavity.

Further, the sealing assembly comprises an elastic ring and a sealing ring, and the sealing ring is located between the elastic ring and the inner wall of the piston.

Further, the cross section of the pressure bearing face is oblique line.

Further, the elastic part with the cavity is acceptd in the sleeve formation, the oilhole with accept the cavity intercommunication, accept the cavity with the draining hole intercommunication.

Further, the elastic member is a spring.

Further, the valve core comprises a main body, and the main body is provided with a plurality of pressure equalizing grooves.

Further, the pressure equalizing groove is annular.

Further, the cross section of the pressure equalizing groove is V-shaped.

Compared with the prior art, the gasket pressure regulating overflow valve has the advantages that:

(1) oil entering from the oil inlet flows to the oil drainage hole through the oil through hole, when oil drainage is stopped, the valve element is pressed, the response time of the overflow valve is generated in the whole process, the sudden impact of the liquid medium on the overflow valve is weakened, the shock absorption effect is achieved, and the response time is realized by setting the oil through hole and the aperture size of the oil drainage hole;

(2) the sleeve is in clearance fit with the plug, the gasket is arranged on the valve core, two ends of the elastic part are respectively abutted against the gasket and the plug, and when the take-off pressure needs to be adjusted, the take-off pressure can be adjusted only by detaching the sleeve and the plug and replacing gaskets with different thicknesses.

Drawings

FIG. 1 is a perspective view of a gasket pressure regulating relief valve of the present invention;

FIG. 2 is a cross-sectional view of the gasket pressure regulating relief valve of FIG. 1;

FIG. 3 is an enlarged view of the gasket pressure regulating relief valve A of FIG. 2;

FIG. 4 is a perspective view of a valve spool of the shim pressure regulating relief valve of FIG. 1;

fig. 5 is a perspective view of a sleeve of the shim pressure regulating relief valve of fig. 1.

In the figure: 10. a valve seat; 11. an oil inlet; 12. a contact part; 20. a valve core; 21. a pressure bearing face; 22. sealing the step; 23. a main body; 230. a pressure equalizing groove; 24. an installation part; 25. an oil passing hole; 30. a sleeve; 31. an oil drainage hole; 32. an oil outlet; 33. a sealing groove; 40. a piston; 50. a gasket; 60. an elastic member; 70. plugging by screwing; 80. a seal assembly; 81. an elastic ring; 82. a seal ring; 90. an accommodating cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when a structure is referred to as being "secured to" another structure, it can be directly on the other structure or intervening structures may also be present, secured by the intervening structures. When a structure is referred to as being "connected" to another structure, it can be directly connected to the other structure or intervening structures may also be present. When a structure is referred to as being "disposed on" another structure, it can be directly on the other structure or intervening structures may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 5, an embodiment of a gasket pressure regulating relief valve according to the present invention includes a valve seat 10, a valve element 20, a sleeve 30, a piston 40, a gasket 50, an elastic element 60, a plug 70, and a sealing assembly 80.

The valve seat 10 is provided with an oil inlet 11 and an interference portion 12. The interference part 12 is at a right angle.

The valve body 20 is provided with a pressure receiving face 21, a seal land 22, a main body 23, and a mounting portion 24. The pressure bearing face 21 is a beveled face. The sealing step 22 is located at the side of the pressure bearing face 21. The body 23 is cylindrical. The outer surface of the main body 23 is provided with a plurality of pressure equalizing grooves 230. The plurality of pressure equalizing grooves 230 are uniformly distributed at intervals on the outer surface of the main body 23. Each of the pressure equalizing grooves 230 has a ring shape. Each of the pressure equalizing grooves 230 has a V-shaped cross-section. The pressure equalizing groove 230 can greatly reduce the influence of radial unbalanced force on the valve core 20, and also reduce the difficulty in manufacturing and the processing cost. The mounting portion 24 is located at the rear of the valve spool 20. The valve core 20 is further provided with an oil passing hole 25, and the oil passing hole 25 penetrates through the valve core 20 and is located at the center of the valve core 20.

The sleeve 30 is provided with a drain hole 31, a drain port 32, and a seal groove 33. The drain hole 31 communicates with the inside of the sleeve 30. An oil outlet 32 is located at the end of sleeve 30. The number of oil outlets 32 is plural, and each oil outlet 32 is circular. A plurality of oil outlets 32 uniformly surround the side wall of the sleeve 30. Seal groove 33 is used to mount seal assembly 80.

The spacer 50 is provided with a through hole.

The elastic member 60 is a spring.

The seal assembly 80 includes a resilient ring 81 and a sealing ring 82.

When the gasket pressure regulating relief valve is assembled, the elastic piece 60 is accommodated in the plug 70 and the end part of the elastic piece abuts against the tail end of the plug 70. The spacer 50 is attached to the attachment portion 24 of the valve body 20, and the valve body 20 and the spacer 50 are housed in the sleeve 30. The valve seat 10 is mounted to the end of the sleeve 30. The oil inlet 11 is communicated with the oil passing hole 25. The abutting part 12 abuts against the pressure bearing surface 21, so that the oil inlet 11 is disconnected from the oil outlet 32, and a line seal is formed. The elastic ring 81 is installed in the sealing groove 33, the sealing ring 82 is sleeved on the elastic ring 81, and the piston 40 is slidably installed on the sleeve 30 and forms a cavity with the sleeve 30. The volume of the cavity varies as the piston 40 moves over the sleeve 30. The seal 82 now contacts the inner wall of the piston 40 to form a seal. The cavity communicates with the drainage hole 31. The sleeve 30 is in clearance fit with the plug 70, so that the gasket 50 is convenient to replace. The sleeve 30 and the plug 70 form a receiving cavity 90. The oil passing hole 25 of the valve core 20 is communicated with the accommodating cavity 90 through a through hole of the gasket 50. The gasket 50 interferes with the elastic member 60 at this time. The elastic force of the elastic member 60 is the trip pressure of the relief valve.

When the gasket pressure-regulating overflow valve is used, hydraulic oil enters from the oil inlet 11 of the valve seat 10, the oil inlet 11 is disconnected from the oil outlet 32 due to the fact that the abutting part 12 abuts against the pressure bearing surface 21, the hydraulic oil flows into the accommodating cavity 90 from the oil passing hole 25 and flows into the cavity through the oil drainage hole 31, and the piston 40 is pushed to move along the sleeve 30 until the piston 40 stops moving. At this time, the cavity is filled with hydraulic oil, the oil drain hole 31 does not leak oil any more, and the pressure at the end of the valve core 20 is increased. When the end pressure of the valve core 20 is greater than the elastic force of the elastic element 60 (the relief valve jump pressure), the valve core 20 moves, the oil inlet 11 is communicated with the oil outlet 32, and the hydraulic oil entering from the oil inlet 11 flows out of the oil outlet 32, so that the redundant flow overflows back to the oil tank. The existence of the oil drainage hole 31 results in the response time of the overflow valve in the whole process, the sudden impact of the liquid medium on the overflow valve is weakened, the shock absorption effect is achieved, and the response time is achieved by the arrangement of the oil passing hole 25 and the aperture size of the oil drainage hole 31.

When the tripping pressure of the overflow valve needs to be adjusted, the sleeve 30 is in clearance fit with the plug 70, after the sleeve 30 and the plug 70 are disassembled, the gasket 50 with different thicknesses is replaced, the elastic piece 60 can be further compressed or relaxed, the tripping pressure is further changed, the operation is simple, and the overflow valve is not damaged during pressure adjustment.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the spirit of the invention, and all equivalent modifications and changes can be made to the above embodiments according to the essential technology of the invention, which falls into the protection scope of the invention.

Claims

1. The utility model provides a gasket pressure regulating overflow valve, includes disk seat, case, elastic component, sleeve and plug, the disk seat reaches the plug install respectively in the sleeve both ends, the case and the elastic component accept in the sleeve, the disk seat is equipped with the oil inlet, the sleeve is equipped with oil-out, its characterized in that: the sleeve with plug clearance fit, gasket pressure regulating overflow valve still includes the gasket, the gasket install in the case, the elastic component both ends respectively with the gasket reaches the plug is contradicted, the disk seat is equipped with conflict portion, the case is equipped with the bearing surface, the bearing surface with conflict portion is contradicted and is made the oil inlet with the oil-out disconnection, the case is equipped with the oilhole, the sleeve is equipped with the draining hole, cross the oilhole with the oil inlet reaches the draining hole intercommunication, the oil that the oil inlet got into passes through earlier the oilhole flow to the draining hole, it exerts pressure to the case again, be greater than behind the elasticity of elastic component, the case removes to make the oil inlet with the oil-out intercommunication.

2. The gasket pressure regulating relief valve of claim 1, wherein: the gasket pressure regulating overflow valve further comprises a piston, the piston is slidably mounted in the sleeve, the piston and the sleeve form a cavity, the oil drainage hole is communicated with the cavity, oil flowing out of the oil drainage hole pushes the piston to move along the sleeve, after the piston moves to a specified position, the cavity is shaped, and the oil drainage hole is sealed.

3. The gasket pressure regulating overflow valve of claim 2, wherein: the gasket pressure regulating overflow valve further comprises a sealing assembly, the sleeve is provided with a sealing groove, and the sealing assembly is located in the sealing groove and contacts with the inner wall of the piston to seal the cavity.

4. The gasket pressure regulating overflow valve of claim 3, wherein: the sealing assembly comprises an elastic ring and a sealing ring, and the sealing ring is located between the elastic ring and the inner wall of the piston.

5. The gasket pressure regulating relief valve of claim 1, wherein: the cross section of the pressure bearing surface is oblique line.

6. The gasket pressure regulating relief valve of claim 1, wherein: the elastic piece with the cavity is acceptd in the sleeve formation, cross the oilhole with accept the cavity intercommunication, accept the cavity with the draining hole intercommunication.

7. The gasket pressure regulating relief valve of claim 1, wherein: the elastic piece is a spring.

8. The gasket pressure regulating relief valve of claim 1, wherein: the valve core comprises a main body, and the main body is provided with a plurality of pressure equalizing grooves.

9. The gasket pressure regulating relief valve of claim 8, wherein: the pressure equalizing groove is annular.

10. The gasket pressure regulating relief valve of claim 8, wherein: the cross section of the pressure equalizing groove is V-shaped.