CN212985680U

CN212985680U - Pressure equalizing overflow valve

Info

Publication number: CN212985680U
Application number: CN202021255250.7U
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: 2021-04-16
Anticipated expiration: 2030-06-30

Abstract

The utility model discloses a pressure-equalizing overflow valve, disk seat and plug are installed respectively in the sleeve both ends, case and elastic component are acceptd in the sleeve, the case is equipped with the bearing surface and is equipped with a plurality of pressure-equalizing grooves, each pressure-equalizing groove is the annular and the cross-section is the V-arrangement, the bearing surface is contradicted with conflict portion and is made oil inlet and oil-out disconnection, it is connected with oil inlet and draining hole to cross the oilhole, the oil that the oil inlet got into flows to draining hole through crossing the oilhole earlier, exert pressure to the case again, after being greater than elastic component's elasticity, the case removes and makes oil inlet and oil-out intercommunication, through the above-mentioned design, when draining hole no longer drains oil, just exert pressure to the case, the response time of overflow valve has been produced to whole process, the liquid medium weakens; the valve core is also provided with a plurality of pressure equalizing grooves, each pressure equalizing groove is annular, the section of each pressure equalizing groove is V-shaped, the influence caused by radial unbalanced force can be greatly reduced, the difficulty in manufacturing is reduced, and the processing cost is reduced.

Description

Pressure equalizing overflow valve

Technical Field

The utility model relates to an overflow valve especially relates to a voltage-sharing 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).

In the existing products of the same type in the market, the valve core can have radial hydraulic pressure change when in use, and the valve core can be clamped and cannot move due to radial unbalanced hydraulic pressure. If the manufacturing accuracy of the spool and valve bore is tightly controlled in order to reduce radial imbalance forces, the difficulty of manufacturing is greatly increased.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a pressure-equalizing overflow valve which reduces the radial hydraulic pressure change of a valve core.

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

a pressure-equalizing overflow valve comprises a valve seat, a valve core, an elastic component, 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 component are accommodated in the sleeve, the valve seat is provided with an oil inlet, the sleeve is provided with an oil outlet, the valve seat is provided with a contact part, the valve core is provided with a pressure bearing surface and a plurality of pressure equalizing grooves, each pressure equalizing groove is annular and has a V-shaped section, the pressure bearing surface is abutted against the abutting part to disconnect the oil inlet from 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 firstly, then the valve element is pressed, and after the elastic force of the elastic component is larger than that of the valve element, the valve element moves to enable the oil inlet to be communicated with the oil outlet.

Further, the pressure-equalizing overflow valve further comprises a piston assembly, the piston assembly is slidably mounted on the sleeve, the piston assembly 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 assembly to move along the sleeve, after the piston assembly moves to a specified position, the cavity is shaped, and the oil drainage hole is sealed.

Further, the piston assembly comprises a piston body and a piston sealing ring, the piston body is slidably mounted on the sleeve, and the piston sealing ring is located between the piston body and the sleeve to seal the cavity.

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

Furthermore, the elastic component comprises an elastic part and a guide pillar, and two ends of the elastic part are respectively abutted against the valve core and the guide pillar.

Further, the guide post is in clearance fit with the plug.

Further, the pressure-equalizing overflow valve further comprises a gasket, the gasket is mounted at the tail of the valve core, and the elastic piece is abutted to the gasket.

Further, the gasket is provided with a through hole, and the through hole is communicated with the oil passing hole.

Further, the elastic part with the sleeve forms accepts the chamber, the oilhole pass through the through-hole with accept the chamber intercommunication, accept the chamber with the draining hole intercommunication.

Further, the elastic member is a spring.

Compared with the prior art, the utility model discloses the case of voltage-sharing overflow valve is equipped with the oilhole, the sleeve is equipped with the draining hole, the oilhole is crossed with oil inlet and draining hole intercommunication, the oil that the oil inlet got into flows to the draining hole through the oilhole earlier, exert pressure to the case again, after being greater than elastic component's elasticity, the case removes and makes oil inlet and oil-out intercommunication, through the above-mentioned design, the oil that the oil inlet got into flows to the draining hole through the oilhole earlier, when the draining hole no longer drains oil, just exert pressure to the case, the whole process has produced the response time of overflow valve, the liquid medium weakens the impact of liquid medium to the overflow valve suddenly, play the absorbing effect, the length of response time is realized through setting up the aperture size of oil; the valve core is also provided with a plurality of pressure equalizing grooves, each pressure equalizing groove is annular, the section of each pressure equalizing groove is V-shaped, the influence caused by radial unbalanced force can be greatly reduced, the difficulty in manufacturing is reduced, and the processing cost is reduced.

Drawings

FIG. 1 is a perspective view of the pressure equalizing overflow valve of the present invention;

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

FIG. 3 is an enlarged view of the pressure equalizing overflow valve A of FIG. 2;

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

fig. 5 is a perspective view of a sleeve of the pressure equalizing 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 gasket; 40. a piston assembly; 41. a piston body; 42. a piston seal ring; 50. a gasket; 60. an elastic component; 61. an elastic member; 62. a seal member; 63. a guide post; 70. plugging by screwing; 80. an adjustment assembly; 81. a screw; 82. a nut; 90. an accommodating cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to 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, in order to illustrate an embodiment of the pressure equalizing overflow valve of the present invention, the pressure equalizing overflow valve includes a valve seat 10, a valve core 20, a sleeve 30, a piston assembly 40, a gasket 50, an elastic assembly 60, a plug 70, and an adjusting 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, an oil outlet 32 and a sealing gasket 33. 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. The number of the sealing gaskets 33 is two, and the piston sealing ring 42 is arranged between the two sealing gaskets 33.

The piston assembly 40 includes a piston body 41 and a piston seal ring 42. The inner wall of the piston body 41 is provided with a groove for accommodating a piston seal ring 42.

The spacer 50 is provided with a through hole.

The elastic assembly 60 includes an elastic member 61, a sealing member 62, and a guide post 63. The elastic member 61 is a spring. One end of the elastic element 61 is sleeved on the guide post 63.

The adjustment assembly 80 includes a screw 81 and a nut 82 mounted to the screw 81.

When the pressure equalizing overflow valve is assembled, the sleeve 30 is in interference fit with the plug 70, and the screw 81 is rotatably arranged at the tail end of the plug 70 through threads. The nut 82 is mounted on the screw 81. The sealing member 62 is sleeved on the guide post 63. The guide post 63 is accommodated in the plug 70 and is in clearance fit with the plug 70 so that the guide post 63 can move in the plug 70. The elastic piece 61 is accommodated in the plug 70 and the end part is sleeved on the guide post 63. The spacer 50 is attached to the mounting portion 24 of the valve spool 20. The valve core 20 and the gasket 50 are accommodated in the sleeve 30, and the gasket 50 abuts against the elastic member 61. Gasket 50 makes contact with the inner wall of sleeve 30 to form a seal. The sleeve 30 now defines a receiving cavity 90 therein. 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 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 piston assembly 40 is slidably mounted to the sleeve 30 and forms a cavity with the sleeve 30. The volume of the cavity varies as the piston assembly 40 moves over the sleeve 30. The accommodating cavity 90 is communicated with the cavity through the oil drainage hole 31.

When the pressure-equalizing 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 portion 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 assembly 40 is pushed to move along the sleeve 30 until the piston assembly 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 61 (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 screw 81 is rotated, and the screw 81 is rotatably arranged at the tail end of the plug 70 through threads, so that the guide pillar 63 is pushed to move in the rotating process of the screw 81, the elastic piece 61 is further compressed or loosened, and the tripping pressure is further changed.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, all according to the equivalent modifications and evolutions of the present invention, which are made to the above embodiments by the essential technology, and all belong to the protection scope of the present invention.

Claims

1. The utility model provides a voltage-sharing 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 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 oil inlet is communicated with the oil outlet, the oil entering from the oil inlet flows to the oil drainage hole through the oil passing hole, the valve element is pressed, and after the elastic force of the elastic assembly is greater than that, the valve element moves to enable the oil inlet to be communicated with the oil outlet.

2. The pressure equalizing overflow valve of claim 1, wherein: the pressure-equalizing overflow valve further comprises a piston assembly, the piston assembly is slidably mounted on the sleeve, the piston assembly 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 assembly to move along the sleeve, after the piston assembly moves to a specified position, the cavity is shaped, and the oil drainage hole is sealed.

3. The pressure equalizing overflow valve of claim 2, wherein: the piston assembly comprises a piston body and a piston sealing ring, the piston body is slidably mounted on the sleeve, and the piston sealing ring is located between the piston body and the sleeve to seal the cavity.

4. The pressure equalizing overflow valve of claim 1, wherein: the cross section of the pressure bearing surface is oblique line.

5. The pressure equalizing overflow valve of claim 1, wherein: the elastic component comprises an elastic piece and a guide post, and two ends of the elastic piece are respectively abutted against the valve core and the guide post.

6. The pressure equalizing overflow valve of claim 5, wherein: the guide post is in clearance fit with the plug.

7. The pressure equalizing overflow valve of claim 5, wherein: the pressure-equalizing overflow valve further comprises a gasket, the gasket is mounted at the tail of the valve core, and the elastic piece is abutted to the gasket.

8. The pressure equalizing overflow valve of claim 7, wherein: the gasket is provided with a through hole which is communicated with the oil passing hole.

9. The pressure equalizing overflow valve of claim 8, wherein: the elastic piece with the cavity is acceptd in the sleeve formation, the oilhole passes through the through-hole with accept the cavity intercommunication, accept the cavity with the draining hole intercommunication.

10. The pressure equalizing overflow valve of claim 5, wherein: the elastic piece is a spring.