CN112228621A

CN112228621A - Hydraulic control manual release normally open valve

Info

Publication number: CN112228621A
Application number: CN202011180037.9A
Authority: CN
Inventors: 徐君鹏; 蒋祖光; 蒋朝晖
Original assignee: Zhejiang Wins Machinery Co ltd
Current assignee: Zhejiang Wins Machinery Co ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-01-15

Abstract

The invention provides a hydraulic control manual release normally open valve, and belongs to the technical field of hydraulic valves. The manual normally open valve solves the problems that an existing manual normally open valve is easy to numb and numb when an arm is in a long-time forced state, and the using effect and the practicability are poor. This manual release normally open valve of hydraulic control, which comprises a valve body, a valve seat, valve gap and case, the inside center of case has the cavity structure and the through-hole of run-through formula, this cavity structure and through-hole are located same axis and communicate each other, be provided with reset spring in the cavity structure, reset spring's both ends are supported respectively and are leaned on in cavity structure interior step department and the interior oil outlet department of valve body, at least one hydraulic pressure runner has been seted up to the axial on the lateral wall of case, the inside axial of disk seat is provided with the guide valve needle, the tip of guide valve needle and case on through-hole position cooperate and the diameter of guide valve needle are. The invention has the advantages of more reasonable integral structure design and capability of controlling the cut-off of the flow passage only by slight thrust generated by applying hydraulic pressure to generate a self-locking effect.

Description

Hydraulic control manual release normally open valve

Technical Field

The invention belongs to the technical field of hydraulic valves, relates to a normally open valve, and particularly relates to a hydraulically-controlled manual release normally open valve.

Background

The release valve is applied to the hydraulic field and comprises a normally open valve and a normally closed valve, the normally closed valve is in a cut-off state in normal use and is turned on through external force, the normally open valve is just opposite in principle and is in a turned-on state in normal use and is cut off through external force, the normally closed valve is mostly applied to the market at present, but the normally open valve is required to be used in some special fields, such as hydraulic control on an elevator, and a hydraulic oil circuit can be cut off in an emergency situation to prevent potential safety hazards.

In the prior art, the normally open valve is divided into two types of manual control and electromagnetic control, the electromagnetic control has the following problems, the structure is relatively complex, the manufacturing cost is high, the reliability is low, namely, the magnetic field intensity is insufficient due to unstable current, or the circuit is aged and cannot generate a magnetic field, and the like, so that the valve core cannot be effectively stopped in an emergency state.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a hydraulic control manual release normally open valve which is more reasonable in overall structural design and can control the cut-off of a flow passage only by slight thrust when hydraulic pressure is applied to generate a self-locking effect.

The purpose of the invention can be realized by the following technical scheme: a hydraulic control manual release normally open valve comprises a valve body, a valve seat, a valve cover and a valve core, wherein the valve body, the valve seat and the valve cover are mutually matched and fastened to form a whole, the valve core is in clearance fit in the valve body and can axially move, the end part of the valve body is provided with an oil inlet which is radially arranged and an oil outlet which is axially arranged, it is characterized in that the inner center of the valve core is provided with a through cavity structure and a through hole which are positioned on the same axis and are communicated with each other, a return spring is arranged in the cavity structure, two ends of the return spring are respectively abutted against the inner step of the cavity structure and the oil outlet of the valve body, at least one hydraulic flow channel is axially arranged on the side wall of the valve core, a pilot valve needle is axially arranged inside the valve seat, the end part of the pilot valve needle is matched with the position of the through hole on the valve core, and the diameter of the pilot valve needle is larger than that of the through hole.

In the hydraulic control manual release normally-open valve, the valve is in a conducting state under normal conditions, hydraulic oil flows in from an oil inlet and flows out from an oil outlet, when the valve needs to be stopped, a pilot valve needle descends to abut against a through hole through external pressure to form sealing and simultaneously contacts with the oil outlet to enable the valve core to move and contact with the oil outlet for sealing, at the moment, the hydraulic oil enters a cavity above the valve core through a hydraulic flow channel on the side wall of the valve core, the sectional area of the upper end surface of the valve core is larger than that of the oil outlet, and the through hole is blocked to be in a sealing state, so that the oil pressure of the hydraulic oil enables the valve core. When the normally open valve needs to be conducted again, the external pressure is only needed to be removed to enable the pilot valve needle to retract, the through hole is in a conducting state, the internal pressure of the valve body is balanced, and the valve core rises due to the elastic force of the return spring, so that the valve is conducted again.

In foretell manual release normally open valve of hydraulic control, the inside radial bulge of disk seat forms two seal grooves and is seal groove and last seal groove down respectively, lower seal groove inside callipers be equipped with oil blanket and O type circle one, the interior front cover of oil blanket contacts with guide's needle, the outside of oil blanket is that cambered surface structure and O type circle are one set outside locating the oil blanket, the below of oil blanket makes it be fixed in down in the seal groove through the clamping ring.

In foretell hydraulic control manual release normally open valve, last seal groove inside callipers be equipped with the sealing sleeve ring, the sealing sleeve ring in have the counter bore structure and be provided with O type circle two, sealing sleeve ring and O type circle two simultaneously with guide's needle contact seal.

In the hydraulic control manual release normally-open valve, the valve cover is provided with a screw rod capable of moving axially, one end of the screw rod is fixedly connected with the pilot valve needle, and the other end of the screw rod extends out of the valve cover and is connected with a handle.

In the hydraulic control manual release normally-open valve, the upper end in the valve seat is provided with the guide block, the guide block is in clearance fit in the valve seat, a return spring is arranged between the guide block and the valve seat, and the guide block and the middle of the screw rod are fixed with each other.

In the hydraulic control manual release normally-open valve, the outer ring of the lower end part of the valve core is of an inclined surface structure, and the contact sealing part of the oil outlet and the valve core is also of an inclined surface structure with the same inclination angle.

In the hydraulic control manual release normally-open valve, a retaining ring and an O-shaped ring III are arranged on the matching surface of the valve body and the valve seat, and a flat gasket is arranged at the bottom of the valve seat.

In the above-mentioned hydraulically-controlled manual release normally-open valve, the valve body, the valve seat and the valve cover are all made of 617 # brass, and the valve core and the pilot valve needle are all made of 304 # stainless steel.

Compared with the prior art, the hydraulic control manual release normally open valve has the following advantages:

1. the external pressure required by the hydraulic oil in a cut-off state is controlled and maintained to be small, the hand of an operator does not need to be in a force application state for a long time, namely, the external pressure is only larger than the elastic force of a spring, so that the valve core can be in contact sealing with the oil outlet movably, and the valve core is self-locked due to the oil pressure after sealing;

2. the movement and the sealing of the valve core are controlled and completed through a mechanical structure, the structure is simple, the manufacturing cost is low, and the stability is good.

Drawings

FIG. 1 is a cross-sectional structural view of a normally open valve;

FIG. 2 is an enlarged view of the structure at A in FIG. 1;

FIG. 3 is an enlarged view of the structure at B in FIG. 1;

in the figure, 1, a valve body; 2. a valve seat; 2a, an upper sealing groove; 2b, a lower sealing groove; 3. a valve cover; 4. a valve core; 4a, a cavity structure; 4b, through holes; 5. an oil inlet; 6. an oil outlet; 7. a return spring; 8. a hydraulic flow passage; 9. a pilot valve needle; 10. oil sealing; 11. a first O-shaped ring; 12. pressing a ring; 13. a sealing collar; 14. an O-shaped ring II; 15. a screw; 16. a handle; 17. a guide block; 18. a return spring; 19. a bevel structure; 20. a retaining ring; 21. an O-shaped ring III; 22. a flat washer.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 to 3, the hydraulic control manual release normally open valve comprises a valve body 1, a valve seat 2, a valve cover 3 and a valve core 4, wherein the valve body 1, the valve seat 2 and the valve cover 3 are mutually matched and fastened to form a whole, and the matching mode is threaded matching and fixing.

The valve core 4 is in clearance fit in the valve body 1 and can axially move, the end part of the valve body 1 is provided with an oil inlet 5 which is radially arranged and an oil outlet 6 which is axially arranged, one end of the axial movement is limited by the limiting end of the valve seat 2 and the other end of the axial movement is limited by the structure of the oil outlet 6, and the normally open valve is fixed on hydraulic equipment through the valve body 1.

The inside center of case 4 has run through cavity structure 4a and through-hole 4b of formula, this cavity structure 4a and through-hole 4b are located same axis and communicate each other, the diameter of cavity structure 4a is greater than the diameter of through-hole 4b, be provided with reset spring 7 in the cavity structure 4a, reset spring 7's both ends are supported respectively and are leaned on in cavity structure 4a step department and the interior oil-out 6 department of valve body 1, reset spring 7 is in compression state makes case 4 go up to move normally open the valve and switch on under the effect of no external force.

At least one hydraulic flow channel 8 is axially formed in the side wall of the valve core 4, a pilot valve needle 9 is axially arranged in the valve seat 2, the end part of the pilot valve needle 9 is matched with the position of the through hole 4b in the valve core 4, the diameter of the pilot valve needle 9 is larger than that of the through hole 4b, the hydraulic flow channel 8 is used for enabling hydraulic oil to enter a cavity above the valve core 4 when the valve core 4 moves downwards, the end part of the pilot valve needle 9 is of a needle point type structure, and the sealing effect is better when the valve core 4 is in contact with the.

Specifically, referring to fig. 2, it is further described that two sealing grooves, namely a lower sealing groove 2b and an upper sealing groove 2a, are formed by radially protruding the inner portion of the valve seat 2, and the protruding portion can support the middle section of the pilot valve needle 9 to prevent the middle section from being bent and broken during the function. Lower seal groove 2b inside callipers is equipped with oil blanket 10 and O type circle 11, the inner cover of oil blanket 10 contacts with guide valve needle 9, the outside of oil blanket 10 is cambered surface structure and O type circle 11 cover is located outside oil blanket 10, the below of oil blanket 10 makes it be fixed in down in seal groove 2b through clamping ring 12, O type circle 11 set up the structure both can produce an inside pressure increase guide valve needle 9 contact surface leakproofness to oil blanket 10 and also played the effect that increases 2 contact surface leakproofness of disk seat, and the design cooperation clamping ring 12 of oil blanket 10 cambered surface structure makes hydraulic oil can produce a radial pressure to it, further increase oil blanket 10 and guide valve needle 9's contact surface leakproofness.

Wherein go up the card in seal groove 2a and be equipped with the sealing sleeve ring 13, have the counter bore structure in the sealing sleeve ring 13 and be provided with two 14 of O type circle, the sealing sleeve ring 13 and two 14 of O type circle contact with guide's needle 9 simultaneously are sealed, and the design of this structure is used for when the interior seal structure of lower seal groove 2b became invalid, can play the effect of replacing sealed, makes this department whole have dual sealing performance.

The valve cover 3 is provided with a screw 15 capable of moving axially, one end of the screw 15 is fixedly connected with the pilot valve needle 9, the other end of the screw 15 extends out of the valve cover 3 and is connected with a handle 16, and the movement of the pilot valve needle 9 is completed by applying external force at the handle 16.

The upper end is provided with guide block 17 in the disk seat 2, and guide block 17 clearance fit is in disk seat 2 and be provided with return spring 18 between the disk seat 2, and guide block 17 and screw 15 middle part reciprocal anchorage. The design of the guide block 17 can reduce the axial movement offset of the pilot valve needle 9, prevent the pilot valve needle 9 from bending, has better overall stability, ensures that the thrust required by the movement of the pilot valve needle 9 is greater than the sum of the elastic forces of the return spring 7 and the return spring 18, ensures that the return spring 7 is contacted to enable the valve core 4 to ascend after the thrust disappears, and ensures that the return spring 18 is contacted to enable the pilot valve needle 9 to ascend.

Referring to fig. 3 specifically, the outer ring of the lower end of the valve core 4 is an inclined surface structure 19, and the contact sealing portion between the oil outlet 6 and the valve core 4 is also the inclined surface structure 19 with the same inclination angle. The design of the structure is used for increasing the contact area of the contact surfaces, increasing the sealing performance, and aligning the sealing surfaces when in contact.

As another technical scheme for further increasing the sealing performance of the oil outlet 6, the reset spring 7 is designed into a double-section structure, steel balls are placed at the joint of the two sections, the elastic force of the spring positioned above the steel balls is larger than that of the spring positioned below the steel balls, the design prevents the steel balls from entering the valve core 4 when the valve core 4 moves downwards, one half of the steel balls are positioned in the valve core 4, the other half of the steel balls protrude out of the valve core 4, the steel balls can be in contact with a hole-shaped structure at the oil outlet 6 to realize further sealing when the valve core 4 descends, and the diameter of the steel balls is larger than.

The matching surface of the valve body 1 and the valve seat 2 is provided with a retaining ring 20 and an O-shaped ring III 21, the bottom of the valve seat 2 is provided with a flat gasket 22, and the structure is used for increasing the sealing performance and the matching fastening degree between the valve body 1 and the valve seat 2 due to the fact that the upper end of the valve body 1 is provided with hydraulic oil.

In the normally open valve, the valve body 1, the valve seat 2 and the valve cover 3 are all made of 617 # brass, and the valve core 4 and the pilot valve needle 9 are all made of 304 # stainless steel, which are all conventional materials.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although various terms are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. The hydraulic control manual release normally-open valve comprises a valve body (1), a valve seat (2), a valve cover (3) and a valve core (4), wherein the valve body (1), the valve seat (2) and the valve cover (3) are mutually matched and fastened to form a whole, the valve core (4) is in clearance fit in the valve body (1) and can axially move, an oil inlet (5) formed in the radial direction and an oil outlet (6) formed in the axial direction are formed in the end part of the valve body (1), the hydraulic control manual release normally-open valve is characterized in that a through cavity structure (4 a) and a through hole (4 b) are formed in the center of the interior of the valve core (4), the cavity structure (4 a) and the through hole (4 b) are located on the same axis and are mutually communicated, a reset spring (7) is arranged in the cavity structure (4 a), and two ends of the reset spring (7) are respectively abutted against the step position in the cavity structure (4 a, at least one hydraulic flow channel (8) is axially formed in the side wall of the valve core (4), a pilot valve needle (9) is axially arranged in the valve seat (2), the end part of the pilot valve needle (9) is matched with the position of the through hole (4 b) in the valve core (4), and the diameter of the pilot valve needle (9) is larger than that of the through hole (4 b).

2. The hydraulic control manual release normally open valve according to claim 1, characterized in that two sealing grooves formed by the radial protrusion of the inner part of the valve seat (2) are a lower sealing groove (2 b) and an upper sealing groove (2 a), an oil seal (10) and a first O-ring (11) are clamped in the lower sealing groove (2 b), the inner sealing surface of the oil seal (10) is in contact with the pilot valve needle (9), the outer part of the oil seal (10) is of an arc surface structure, the first O-ring (11) is sleeved outside the oil seal (10), and the oil seal (10) is fixed in the lower sealing groove (2 b) through a compression ring (12).

3. The hydraulically controlled manual release normally open valve as claimed in claim 2, wherein a sealing collar (13) is clamped in the upper sealing groove (2 a), the sealing collar (13) has a counter bore structure and is provided with a second O-ring (14), and the sealing collar (13) and the second O-ring (14) are simultaneously in contact sealing with the pilot valve needle (9).

4. The hydraulically controlled manual release normally open valve as claimed in claim 1, characterized in that the valve cover (3) is provided with an axially movable threaded rod (15), one end of the threaded rod (15) is fixedly connected with the pilot valve needle (9), and the other end extends out of the valve cover (3) and is connected with a handle (16).

5. The hydraulically controlled manual release normally open valve according to claim 4, characterized in that a guide block (17) is arranged at the upper end in the valve seat (2), the guide block (17) is in clearance fit in the valve seat (2) and a return spring (18) is arranged between the guide block and the valve seat (2), and the guide block (17) and the middle part of the screw rod (15) are fixed with each other.

6. The hydraulically controlled manual release normally-open valve is characterized in that the outer ring of the lower end part of the valve core (4) is in a slope structure (19), and the contact sealing part of the oil outlet (6) and the valve core (4) is also in the slope structure (19) with the same inclination angle.

7. The hydraulically controlled manual release normally open valve according to claim 1, characterized in that the mating surfaces of the valve body (1) and the valve seat (2) are provided with a retaining ring (20) and an O-ring three (21), and the bottom of the valve seat (2) is provided with a flat gasket (22).

8. The hydraulically controlled manual release normally open valve according to claim 1, characterized in that the valve body (1), the valve seat (2) and the valve cover (3) are all 617 # brass, and the valve core (4) and the pilot needle (9) are all 304 # stainless steel.