CN218479990U

CN218479990U - High-pressure oil-supplementing overflow valve

Info

Publication number: CN218479990U
Application number: CN202222676604.0U
Authority: CN
Inventors: 陈陆生; 曲春秋; 彭锋
Original assignee: Zhejiang Sanshang Zhidi Technology Co ltd
Current assignee: Zhejiang Sanshang Zhidi Technology Co ltd
Priority date: 2022-10-10
Filing date: 2022-10-10
Publication date: 2023-02-14
Anticipated expiration: 2032-10-10

Abstract

The utility model discloses a high-pressure oil-supplementing overflow valve, which belongs to the technical field of hydraulic valves and comprises a valve body with a hollow interior, wherein the left end of the valve body is provided with a valve seat with a hollow interior, the left end of the valve seat is provided with an opening, the right end of the valve seat is provided with a sealing port, a pressure regulating valve rod is fixed in the opening, the right end of the pressure regulating valve rod is supported with a pressure regulating spring, and the other end of the pressure regulating spring is supported with a pilot valve; a valve sleeve is arranged on the outer side of the right end of the valve seat in a sliding mode, a first oil port is formed in the side wall of the valve sleeve, a valve rod assembly is arranged in the valve sleeve in a sliding mode, and a pressure oil cavity is formed by matching the valve seat, the valve sleeve and the valve rod assembly; the valve rod assembly comprises a main valve sleeve, a pilot valve core is connected in the main valve sleeve in a sliding mode, and a throttling hole and a second oil port which are communicated with the pressure oil cavity are formed in the pilot valve core. The utility model discloses high pressure oil supplementing overflow valve can work under high pressure, and is difficult for appearing shake, card valve phenomenon.

Description

High-pressure oil-supplementing overflow valve

Technical Field

The utility model belongs to the technical field of the hydrovalve, more specifically relates to a high pressure oil supplementing overflow valve.

Background

The hydraulic valve is applied to various engineering machines to meet various functional requirements, such as reversing, safety overflow protection and the like. At present, the hydraulic safety protection devices of engineering machinery and agricultural machinery all adopt safety valves with rated pressure below 31.5Mpa to protect a main system, but in some specific occasions, for example, the pressure in an oil cylinder is instantly increased due to abnormal impact of the oil cylinder. The oil cylinder and the motor move back and forth at the same time, and the suction phenomenon may exist. Most overflow valves are easy to generate pressure fluctuation under the working conditions of high pressure and large flow to cause the conditions of shaking or valve clamping. The existing method is realized by connecting an overflow valve with a check valve in parallel, and the overflow valve has the disadvantages of higher cost, larger installation space and inconvenience in use.

SUMMERY OF THE UTILITY MODEL

To the defect of prior art, the utility model aims to provide a high pressure mends oily overflow valve aims at solving the problem that the rated pressure of overflow valve is less, inhale empty, shake easily or block the valve under the large-traffic operating mode of high pressure.

In order to achieve the purpose, the utility model provides a high-pressure oil-supplementing overflow valve, which comprises a valve body with a hollow interior, wherein the left end of the valve body is provided with a valve seat with a hollow interior, the left end of the valve seat is provided with an opening, the right end of the valve seat is provided with a sealing opening, a pressure-regulating valve rod is fixedly arranged in the opening, a pressure-regulating spring is propped against the right end of the pressure-regulating valve rod, the other end of the pressure-regulating spring is propped against a pilot valve, and the pilot valve can move along the axial direction to open and close the sealing opening; a valve sleeve is arranged on the outer side of the right end of the valve seat in a sliding mode, a first oil port is formed in the side wall of the valve sleeve, a valve rod assembly is arranged in the valve sleeve in a sliding mode, and a pressure oil cavity is formed by matching the valve seat, the valve sleeve and the valve rod assembly; the valve rod assembly comprises a main valve sleeve, a pilot valve core is connected in the main valve sleeve in a sliding mode, a throttling hole and a second oil port which are communicated with the pressure oil cavity are formed in the pilot valve core, and the main valve sleeve can be communicated with or separated from the first oil port and the second oil port when moving.

Further, a high pressure seal is disposed between the valve seat and the valve housing, and a high pressure seal is also disposed between the valve housing and the valve stem assembly.

Furthermore, the valve sleeve and the main valve sleeve are matched with each other through a large clearance, the large clearance is in a range of 0.1-0.2 mm, the main valve sleeve and the pilot valve core are in a small clearance fit, and the small clearance is in a range of 0.005-0.01 mm.

Furthermore, a limiting step is arranged in the middle of the valve seat, a reset spring is arranged on the limiting step in a supporting mode, the other end of the reset spring is arranged on the valve sleeve in a supporting mode, and the reset spring has the trend of pushing the valve sleeve to move rightwards.

Furthermore, a pilot spring is arranged in the pressure oil cavity, one end of the pilot spring is abutted against the end part of the valve seat, the other end of the pilot spring is abutted against the pilot valve core, and the pilot spring has a movement trend of driving the pilot valve core to move rightwards.

Still further, the high pressure seal is a greige ring.

Furthermore, the pressure regulating valve rod is fixed with the valve seat through a regulating nut and a locking nut.

Furthermore, sealing rings are sleeved in grooves in the outer walls of the valve body, the valve seat and the pressure regulating valve rod.

Compared with the prior art, the technical proposal of the utility model improves the rated pressure of the work of the overflow valve due to the arrangement of the high-pressure sealing element; the valve sleeve and the main valve sleeve are in large clearance fit, so that the main valve sleeve is prevented from moving and being blocked during high pressure; the pilot valve core is provided with the throttling hole, meanwhile, the main valve sleeve and the pilot valve core are in small clearance fit, the positioning is accurate, and when the pilot valve is contacted with the pilot valve core, the pilot valve core can be prevented from shaking; the valve sleeve can be reset quickly by arranging the reset spring.

Drawings

Fig. 1 is a schematic structural view of a high-pressure oil-supplementing overflow valve provided by the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a hydraulic schematic diagram of the high-pressure oil-supplementing overflow valve provided by the present invention;

the structure corresponding to each numerical mark in the drawings is as follows: 1-valve body, 2-valve seat, 21-opening, 22-sealing port, 23-limit step, 3-pressure regulating valve rod, 4-pressure regulating spring, 5-pilot valve, 6-valve sleeve, 7-valve rod component, 71-main valve sleeve, 72-pilot valve core, 721-throttling hole, 8-pressure oil cavity, 9-reset spring, 10-pilot spring, 11-high-pressure sealing element, 12-regulating nut, 13-locking nut, 14-sealing ring, P-first oil port and T-second oil port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 3, the utility model provides a high pressure oil supplementing overflow valve, including inside for

hollow valve body

1, 1 left end of valve body is equipped with

disk seat

2, and 2 inside cavities of disk seat and left end are equipped with opening 21, and the right-hand member is equipped with sealing port 22, and opening 21 internal fixation has pressure regulating valve rod 3, and is concrete, and pressure regulating valve rod 3 passes through adjusting nut 12 and lock nut 13 and is fixed with disk seat 2. The right end of the pressure regulating valve rod 3 is propped against a pressure regulating spring 4, the other end of the pressure regulating spring 4 is propped against a pilot valve 5, and the pilot valve 5 can move along the axial direction to switch the sealing opening 22; a valve sleeve 6 is slidably arranged on the outer side of the right end of the valve seat 2, a first oil port P is formed in the side wall of the valve sleeve 6 and is an oil inlet, a valve rod assembly 7 is slidably arranged in the valve sleeve 6, and a pressure oil cavity 8 is formed among the valve seat 2, the valve sleeve 6 and the valve rod assembly 7 in a matched mode; the valve rod assembly 7 includes a main valve sleeve 71, a pilot valve core 72 is slidably connected in the main valve sleeve 71, a throttle hole 721 communicated with the pressure oil chamber 8 and a second oil port T are formed in the pilot valve core 72, the second oil port T is an oil return port, the main valve sleeve 71 can communicate with or block the first oil port P and the second oil port T when moving, and the details of each component will be described with reference to the specific embodiment.

The ordinary overflow valve is sealed by an ordinary O-shaped ring, the rated working pressure of the ordinary overflow valve is within 31.5MPA, in order to improve the rated working pressure of the overflow valve, a high-pressure sealing element is used as a sealing element, a high-pressure sealing element 11 is arranged between the valve seat 2 and the valve sleeve 6, and a high-pressure sealing element 11 is also arranged between the valve sleeve 6 and the valve rod assembly 7, specifically, the high-pressure sealing element 11 is a Glay ring (the Glay ring is formed by combining a rubber O-shaped ring and a polytetrafluoroethylene ring, the O-shaped ring applies force, the Glay ring is a double-acting piston seal, the friction force is low, no creeping occurs, the starting force is small, and high pressure is resisted), the rated working pressure of the overflow valve can be 50Mpa, and in order to further improve the sealing effect of the overflow valve, sealing rings 14 are sleeved in grooves on the outer walls of the valve body 1, the valve seat 2 and the pressure regulating valve rod 3.

In a common overflow valve, a main valve sleeve 71 and a pilot valve core 72 are in large clearance fit, the guiding precision is poor, and the value range of the large clearance is between 0.1mm and 0.2 mm; the throttling pressure difference is formed by the size of the gap, and because the gap is large, the pilot valve core 72 is unstable after the pilot valve 5 is contacted with the pilot valve core 72, the pressure fluctuation is not obvious at medium and low pressure, and the pressure fluctuation force is large at high pressure, so that the main valve is squealed. In the embodiment, a small gap of 0.005mm-0.01mm is adopted between the pilot valve core and the main valve core, so that the guiding precision is improved, and a throttling hole 721 is drilled on the pilot valve core; in a common overflow valve, small clearance sealing is also adopted between the valve sleeve 6 and the main valve sleeve 71, the hydraulic clamping force between the valve sleeves is not obvious at medium and low pressure, and clamping stagnation can occur at high pressure, so that in the embodiment, in order to avoid the hydraulic clamping stagnation phenomenon under the high-pressure condition, large clearance fit is adopted between the valve sleeve 6 and the main valve sleeve 71.

Specifically, in order to realize the quick reset of the valve sleeve 6, the middle of the valve seat 2 is provided with a limiting step 23, the limiting step 23 is provided with a reset spring 9 in a propping manner, the other end of the reset spring 9 is arranged on the valve sleeve 6 in a propping manner, and the reset spring 9 has a tendency of pushing the valve sleeve 6 to move rightwards.

Specifically, a pilot spring 10 is arranged in the pressure oil chamber 8, one end of the pilot spring 10 abuts against the end of the valve seat 2, the other end of the pilot spring 10 abuts against the pilot valve spool 72, and the pilot spring 10 has a movement tendency of driving the pilot valve spool 72 to move rightwards.

When the high-pressure flow-supplementing overflow valve is used, the high-pressure flow-supplementing overflow valve is mainly installed on each branch oil circuit of a hydraulic device (an oil cylinder and a motor). When the hydraulic device is impacted by external abnormality (the pressure is more than 40 Mpa), the valve is opened to drain high pressure back to the oil tank so as to protect the hydraulic oil cylinder and the pipeline; when negative pressure is generated in the oil cylinder, oil is supplemented with the negative pressure from the oil tank pipeline to avoid vacuum formation and cavitation, namely, the phenomenon of air suction is avoided, and the specific working principle is as follows.

When high-pressure oil enters from the first oil port P, the high-pressure oil enters the pressure oil cavity 8 through the inner hole of the pilot valve core 72, and the pressure oil in the pressure oil cavity 8 and the pilot spring 10 jointly act to enable the main valve sleeve 71 to be in contact with the hole pattern rightwards, so that the first oil port P and the second oil port T are isolated; when the pressure oil of the first oil port P continuously rises, the pilot valve core 72 moves leftwards and butts against the pilot valve 5, so that the sealing port 22 is opened, and pressure relief and overflow are realized; when the pressure of the first port P forms a negative pressure, the pressure of the first port T pushes the valve sleeve 6 to move leftward, so that the oil is delivered from the second port T to the first port P.

Because the main valve sleeve 71 and the valve sleeve 6 are in large clearance fit, the high-pressure valve core can be prevented from being blocked, and when the valve is in an overflow working condition, pressure oil opens the sealing port 22 of the pilot valve 5 and the valve seat 2. At this time, due to the pressure difference between the two ends of the pilot valve core 72, the pilot valve core 72 moves to the left and collides with the pilot valve 5, so as to prevent the radial stress imbalance of the pilot valve under the action of the flow, thereby causing the chattering and squeal. In this case, the high-pressure oil flows into the pressure oil chamber 8 from the orifice 721 of the pilot spool 72, and then overflows through the sealing port 22, reducing the chattering of the spool pilot spool 72; when the oil is replenished (the pressure of the first port P is negative pressure, which means suction phenomenon occurs), the valve sleeve 6 and the main valve sleeve 71 move leftward at the same time, and the hydraulic oil of the second port T can flow into the negative pressure first port P, so that the oil replenishment is realized.

It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims

1. The high-pressure oil-supplementing overflow valve is characterized in that: the valve comprises a valve body (1) with a hollow interior, wherein a valve seat (2) with a hollow interior is arranged at the left end of the valve body (1), an opening (21) is arranged at the left end of the valve seat (2), a sealing opening (22) is arranged at the right end of the valve seat, a pressure regulating valve rod (3) is fixed in the opening (21), a pressure regulating spring (4) is abutted against the right end of the pressure regulating valve rod (3), a pilot valve (5) is abutted against the other end of the pressure regulating spring (4), and the pilot valve (5) can move along the axial direction to open and close the sealing opening (22); a valve sleeve (6) is arranged on the outer side of the right end of the valve seat (2) in a sliding mode, a first oil port (P) is formed in the side wall of the valve sleeve (6), a valve rod assembly (7) is arranged in the valve sleeve (6) in a sliding mode, and a pressure oil cavity (8) is formed by matching the valve seat (2), the valve sleeve (6) and the valve rod assembly (7); the valve rod assembly (7) comprises a main valve sleeve (71), a pilot valve core (72) is connected in the main valve sleeve (71) in a sliding mode, a throttling hole (721) communicated with the pressure oil cavity (8) and a second oil port (T) are formed in the pilot valve core (72), and the main valve sleeve (71) can be communicated with or separated from the first oil port (P) and the second oil port (T) when moving.

2. The high-pressure oil-replenishing overflow valve according to claim 1, characterized in that: the valve seat (2) and be equipped with high-pressure seal spare (11) between valve barrel (6), valve barrel (6) with also be equipped with high-pressure seal spare (11) between valve rod subassembly (7).

3. The high-pressure oil-replenishing overflow valve according to claim 1, characterized in that: the valve sleeve (6) and the main valve sleeve (71) are in large clearance fit, the value range of the large clearance is 0.1mm-0.2mm, the main valve sleeve (71) and the pilot valve core (72) are in small clearance fit, and the value range of the small clearance is 0.005mm-0.01 mm.

4. The high-pressure oil-replenishing overflow valve according to claim 1, characterized in that: be equipped with spacing step (23) in the middle of disk seat (2), spacing step (23) are gone up to support and are equipped with reset spring (9), reset spring (9) other end supports and establishes on valve barrel (6), reset spring (9) have the promotion valve barrel (6) trend of moving right.

5. The high-pressure oil-replenishing relief valve according to claim 1, characterized in that: a pilot spring (10) is arranged in the pressure oil cavity (8), one end of the pilot spring (10) abuts against the end portion of the valve seat (2), the other end of the pilot spring (10) abuts against the pilot valve core (72), and the pilot spring (10) has a movement trend of driving the pilot valve core (72) to move rightwards.

6. The high-pressure oil-replenishing overflow valve according to claim 2, characterized in that: the high-pressure sealing element (11) is a Gray ring.

7. The high-pressure oil-replenishing overflow valve according to claim 1, characterized in that: the pressure regulating valve rod (3) is fixed with the valve seat (2) through a regulating nut (12) and a locking nut (13).

8. The high-pressure oil-replenishing overflow valve according to claim 1, characterized in that: the valve body (1), disk seat (2) and all overlap in the outer wall recess of pressure regulating valve rod (3) and be equipped with sealing washer (14).