Flush valve with buffering protection function

Abstract

The utility model discloses a flush valve with buffer protection, which comprises a valve body (1), a port A and a port B are arranged on the valve body (1), the port B is communicated with an oil return path of the flush valve, a low-pressure overflow valve core (2) is arranged between the port A and the port B, a throttling valve core (3) is arranged at the end of the low-pressure overflow valve core (2) facing the port A, and an ejector rod (4) is arranged at the other end of the low-pressure overflow valve core (2). A blind hole (5) is formed in the end face, facing the low-pressure overflow valve element (2), of the ejector rod (4), the low-pressure overflow valve element (2) is inserted into the blind hole (5), the low-pressure overflow valve element (2) is in clearance fit with the ejector rod (4), and a spring (6) is arranged between the ejector rod (4) and the low-pressure overflow valve element (2). A plurality of annular grooves (7) are formed in the peripheral face, inserted into the blind hole (5), of the low-pressure overflow valve element (2). The utility model has the advantages that the passing of impact force can be reduced, and the leakage risk of an oil return path and a system pipeline is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of flush valve, especially relate to a flush valve with buffer protection. BACKGROUND

[0002] As Figure 5 As shown in the structure of the prior art flush valve, including valve body, the valve body is equipped with A mouth and B mouth, A mouth and B mouth are the port of oil liquid in and out of flush valve, B mouth is connected with the oil return oil circuit of flush valve, low pressure overflow valve core is equipped between A mouth and B mouth, low pressure overflow valve core is equipped with overflow hole in the axial direction, low pressure overflow valve core is embedded with throttle valve core in one end, throttle valve core is equipped with throttle hole in the axial direction, the other end of low pressure overflow valve core is equipped with pre-tightening spring, when A mouth is connected with oil liquid of certain pressure, oil liquid pressure pushes throttle valve core and low pressure overflow valve core to move against spring pre-tightening force, makes A mouth and B mouth communicate.

[0003] Under certain working conditions, flush valve passes through large flow, and the flush oil liquid is acted on the low pressure overflow valve core with relatively large impact force, so that the low pressure overflow valve core moves rapidly, A mouth and B mouth change from the disconnected state to the large opening state suddenly, the impact force passes through the low pressure overflow valve core rapidly, and is acted on the oil return oil circuit of flush valve and the related system pipeline, so that the oil leakage risk is increased. UTILITY MODEL CONTENTS

[0004] The utility model discloses a flush valve with buffer protection, which has the advantages of reducing the impact force and reducing the leakage risk of the oil return oil circuit and the system pipeline.

[0005] The utility model discloses a flush valve with buffer protection, which has the advantages of reducing the impact force and reducing the leakage risk of the oil return oil circuit and the system pipeline.

[0006] In the foregoing flush valve with buffer protection, a plurality of annular grooves are arranged on the outer circumferential surface of the low pressure overflow valve core inserted into the blind hole.

[0007] In the foregoing flush valve with buffer protection, an adjusting screw is arranged on the valve body, and the screwed end of the adjusting screw axially abuts against the ejector rod.

[0008] In the foregoing flush valve with buffer protection, a locking nut is arranged on the adjusting screw.

[0009] In the aforementioned flushing valve with buffer protection, the spring is helical and located on the outside of the push rod.

[0010] In the aforementioned flushing valve with buffer protection, the adjusting screw and the push rod are in conical contact.

[0011] Compared with existing technologies, this invention adds a push rod to the existing flushing valve. The low-pressure relief valve core is axially inserted into the push rod, forming a relatively sealed cavity between the low-pressure relief valve core and the push rod. The low-pressure relief valve core and the push rod are in clearance fit. When a large flow rate is introduced through port A, some oil enters the cavity, giving the low-pressure relief valve core a reaction force. The moving speed of the low-pressure relief valve core matches the speed of oil seepage from the cavity, preventing the low-pressure relief valve core from moving too quickly, reducing impact force, effectively protecting the return oil circuit of the flushing valve and related system pipelines, and reducing the risk of oil leakage. Therefore, this invention has the advantage of reducing impact force and reducing the risk of leakage in the return oil circuit and system pipelines.

[0012] Furthermore, by setting an adjusting screw, the preload of the spring can be changed, thereby altering the opening pressure of the flushing valve and broadening the applicability of this invention. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a hydraulic schematic diagram of this utility model.

[0015] Figure 3 This is a schematic diagram of the low-pressure relief valve core.

[0016] Figure 4 This is a schematic diagram of the top rod structure.

[0017] Figure 5 This is a schematic diagram of an existing flushing valve.

[0018] The markings in the attached diagram are: 1-valve body, 2-low pressure relief valve core, 3-throttle valve core, 4-push rod, 5-blind hole, 6-spring, 7-annular groove, 8-adjusting screw, 9-locking nut. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0020] Example. A flushing valve with buffer protection is an improvement on an existing flushing valve, such as... Figure 1 As shown, it includes a valve body 1, and the valve body 1 is provided with port A ( Figure 1 (as shown in A) and B (as shown in B) Figure 1The low pressure overflow valve core 2 is inserted into the blind hole 5, and a relatively sealed cavity E is formed in the blind hole 5.

[0021] The other end of the low pressure overflow valve core 2 is provided with a top rod 4, and the top rod 4 is provided with a blind hole 5 on the end surface facing the low pressure overflow valve core 2. The low pressure overflow valve core 2 is inserted into the blind hole 5, so that a relatively sealed cavity E is formed in the blind hole 5. Figure 1 The low pressure overflow valve core 2 is in clearance fit with the top rod 4, and a helical spring 6 is arranged between the top rod 4 and the low pressure overflow valve core 2.

[0022] The outer peripheral surface of the low pressure overflow valve core 2 inserted into the blind hole 5 is provided with a plurality of annular grooves 7.

[0023] The valve body 1 is provided with an adjusting screw 8, and the adjusting screw 8 is provided with a locking nut 9. The screwed end of the adjusting screw 8 axially abuts against the top rod 4, and the taper surfaces of the adjusting screw 8 and the top rod 4 are in contact. The axial position of the top rod 4 in the valve body 1 is changed by adjusting the adjusting screw 8. The taper surface contact between the adjusting screw 8 and the top rod 4 helps to keep the top rod 4 coaxial with the low pressure overflow valve core 2, so that the low pressure overflow valve core 2 moves smoothly and the failure rate is reduced.

[0024] Working principle: The oil liquid from the A port enters the flush valve, and then enters the cavity E through the throttle hole of the throttle valve core 3 and the overflow hole of the low pressure overflow valve core 2. The oil liquid of the A port also acts on the end surfaces of the low pressure overflow valve core 2 and the throttle valve core 3, and pushes the low pressure overflow valve core 2 to move against the pre-tightening force of the spring 6. At this time, the internal pressure of the cavity E increases, and the low pressure overflow valve core 2 is given a counterforce. Since the low pressure overflow valve core 2 is in clearance fit with the top rod 11, the movement of the low pressure overflow valve core 2 will be slowly pushed out with the seepage of the oil liquid in the cavity E, thereby limiting the movement speed of the opening of the low pressure overflow valve core 2, and realizing the pressure impact protection of the oil return oil way and the system oil way of the flush valve. The oil liquid seeping out of the cavity E enters the oil return oil way through the B port.

[0025] Figure 2 In the figure, the T port is the oil return port, and the M, MA and MB ports are the pressure measuring oil ports.

Claims

1. A flush valve with buffer protection, comprising a valve body (1), an A port and a B port are arranged on the valve body (1), the B port is communicated with an oil return oil way of the flush valve, a low pressure overflow valve core (2) is arranged between the A port and the B port, a throttle valve core (3) is arranged at an end of the low pressure overflow valve core (2) which faces the A port, characterized in that: The other end of the low pressure relief valve core (2) is provided with a top rod (4), the top rod (4) is provided with a blind hole (5) on the end face thereof, the low pressure relief valve core (2) is inserted into the blind hole (5), the low pressure relief valve core (2) is in clearance fit with the top rod (4), and a spring (6) is arranged between the top rod (4) and the low pressure relief valve core (2).

2. The flush valve with cushioning protection according to claim 1, wherein: A plurality of annular grooves (7) are arranged on the outer circumferential surface of the blind hole (5) into which the low pressure relief valve core (2) is inserted.

3. The flush valve with cushioning protection according to claim 1, wherein: An adjusting screw (8) is arranged on the valve body (1), the screw-in end of the adjusting screw (8) axially abuts against the top rod (4), and the axial position of the top rod (4) in the valve body (1) is changed by adjusting the adjusting screw (8).

4. The flush valve with buffer protection according to claim 3, wherein: A lock nut (9) is arranged on the adjusting screw (8).

5. The flush valve with cushioning protection according to claim 3, wherein: The spring (6) is helical, and the spring (6) is located outside the top rod (4).

6. The flush valve with cushioning protection according to claim 3, wherein: The adjusting screw (8) and the top rod (4) are in conical surface contact.

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