Reversing valve with anti-blocking function

Abstract

The utility model relates to the technical field of reversing valves, in particular to a reversing valve with an anti-blocking function, which comprises a reversing valve body, mounting cavities are arranged at an oil suction port and an oil return port on a main pipe of the reversing valve body, a baffle plate is elastically connected in a cylinder body, a pressure relief hole with the same diameter as a pipeline mounting hole is arranged on the baffle plate, and the pressure relief hole is communicated with the oil suction port and the oil return port. A blocking mechanism is arranged in the pressure relief hole, when the pressure intensity in the installation cavity is increased to a certain degree, the baffle is pushed by fluid to move downwards, and after the baffle moves downwards to a set distance, the blocking mechanism is opened to completely expose the pressure relief hole. The pressure relief hole can be directly opened after the performance of the filter element is seriously reduced, the pressure relief hole is kept in an open state, and the pressure in the mounting cavity is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reversing valve technical field, specifically is a reversing valve with anti -blocking function. BACKGROUND

[0002] The reversing valve is a control element in the hydraulic system, is used for changing the flow direction of fluid, thereby realizes the movement direction control of the execution element (such as hydraulic cylinder), and the anti -blocking design of reversing valve usually installs filter core in the installation cavity of the oil suction port and the oil return port of valve body, filters the impurities in oil.

[0003] And in the running process of filter core, the performance of filter core will gradually decline, can cause the increase of pressure in installation cavity, to avoid excessive pressure, need regular cleaning or replacement, to avoid the possible damage caused by not timely replacement, need to set up pressure relief structure, when the pressure in filter core is too large, timely liquid into the filter core is guided out;

[0004] Commonly used is that the installation cavity bottom wall is opposite the part of filter core inner chamber bottom mouth and is set up with the flow guide hole communicated with the valve body main pipe, and the elastic baffle is installed in the flow guide hole, utilizes the elastic baffle to block the flow guide hole when pressure is normal, and when pressure is too large, the elastic baffle is impacted and occurs elastic deformation displacement, removes the blocking state of flow guide hole, so that the liquid in filter core can directly flow into the main pipe;

[0005] Since the elastic baffle is always kept in elastic connection with the flow guide hole, the opening amplitude of the elastic baffle is uncontrollable, which can keep the installation cavity in a high pressure state all the time, and has a large pressure on the sealing assembly in the installation cavity. INVENTION CONTENTS

[0006] (I) Technical problem

[0007] The utility model aims at at least solving the problem that the installation cavity is kept in a high pressure state for a long time before the filter core is replaced when the performance of the filter core is reduced to a certain extent in the prior art.

[0008] (II) Technical content

[0009] The present scheme provides a reversing valve with anti -blocking function, which is achieved by the following specific technical means: a reversing valve body, an installation cavity at the oil suction port and the oil return port on the main pipe of the reversing valve body, a cavity cover provided with a pipe installation hole, a filter core in the installation cavity;

[0010] A cylinder is fixedly penetrated at the bottom center of the installation cavity, and the bottom port of the filter core is inserted on the cylinder, and the top port of the filter core is opposite the pipe installation hole;

[0011] A flow guide hole is formed in the bottom wall of the installation cavity near the side wall, and the liquid flowing into the pipe installation hole enters the filter element, and then flows out of the installation hole into the main pipe after being filtered by the filter element;

[0012] An elastic connection is formed between the baffle and the cylinder, a pressure relief hole is formed in the baffle, and a blocking mechanism is arranged in the pressure relief hole. As the pressure in the installation cavity increases, the baffle is pushed downward by the liquid. When the baffle moves downward to a certain distance, the blocking mechanism opens to completely expose the pressure relief hole.

[0013] Preferred technical solution one: a bottom hole with the same diameter as the pressure relief hole is formed in the bottom wall of the cylinder, and a spring one is connected between the baffle and the bottom wall of the cylinder.

[0014] Preferred technical solution two: the cylinder is composed of an upper top cylinder and a lower bottom cylinder, the inner diameter of the top cylinder is smaller than the inner diameter of the bottom cylinder, and the diameter of the baffle is equal to the inner diameter of the top cylinder;

[0015] An elastic connection is formed between the baffle and the cylinder, a pressure relief hole is formed in the baffle, and a blocking mechanism is arranged in the pressure relief hole. As the pressure in the installation cavity increases, the baffle is pushed downward by the liquid. When the baffle moves downward to a certain distance, the blocking mechanism opens to completely expose the pressure relief hole.

[0016] Preferred technical solution three: an installation hole is formed in the baffle directly below the pressure relief hole, and the diameter of the installation hole is larger than the diameter of the pressure relief hole. Multiple groups of horizontal holes are uniformly and intermittently formed in the side edges of the baffle and communicate with the installation hole.

[0017] The blocking mechanism is composed of movable blocking pieces consistent with the number of horizontal holes and corresponding to the positions. The movable blocking piece includes a fan-shaped blocking piece and a horizontal rod fixed to the outer side edge of the fan-shaped blocking piece. The horizontal rod slides through the horizontal hole, and the fan-shaped blocking piece is located in the installation hole. An enlarged protrusion is fixed to the outer end of the horizontal rod. A spring two is connected between the inner side wall of the horizontal hole and the fan-shaped blocking piece. When the baffle slides in the top cylinder, the spring two is in a stretched state, and the protrusion slides in contact with the inner wall of the top cylinder. At this time, the end of the multiple groups of fan-shaped blocking pieces contacts to form a complete circular piece, which contacts the top wall of the installation hole and blocks the pressure relief hole.

[0018] When the baffle moves downward to drive the protrusion to move into the bottom cylinder, the inner diameter of the bottom cylinder is larger, and the multiple groups of fan-shaped blocking pieces move away from each other under the rebound force of the spring two, completely exposing the pressure relief hole.

[0019] Preferred technical solution four: the bottom cylinder is composed of two groups of sub-cylinders connected by rotation, the upper sub-cylinder is fixed to the top cylinder, the lower sub-cylinder is fixed to the bottom wall of the installation cavity, and the contact surface of the two groups of sub-cylinders has a sealing piece.

[0020] The inner wall top of the upper group of sub-cylinders is fixed with arc protrusions equal in number and corresponding to the protrusions, and the arc protrusions and the protrusions are dislocated in the same plane or are stacked in the plane by rotating the upper group of sub-cylinders.

[0021] In the completely overlapped state, the multiple groups of fan-shaped blocking pieces re-close the pressure relief hole, and the baffle is moved to the top cylinder under the rebound of spring one to complete the resetting.

[0022] The fifth preferred technical solution is that the side edge of the baffle has a notch with the same size as the protrusion, and when the multiple groups of fan-shaped blocking pieces block the pressure relief hole, the protrusion is just clamped into the notch.

[0023] (Three) Technical effects

[0024] The above structure makes the present application have the following beneficial effects:

[0025] By setting the pressure relief hole on the baffle, installing the blocking mechanism in the pressure relief hole, and combining the structural characteristics of the bottom cylinder and the top cylinder, the pressure relief hole can be directly opened when the filter core performance is seriously degraded, and the pressure relief hole is kept open, the pressure in the installation cavity is reduced, and the sealing assembly is prevented from being damaged due to long-term high pressure in the installation cavity before the filter core is replaced. DETAILED DESCRIPTION

[0026] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0027] Fig. 1 It is a schematic diagram of the overall structure of the present application;

[0028] Fig. 2 It is a sectional view of the installation cavity, the cavity cover and the filter core of the present application;

[0029] Fig. 3 It is an exploded view of the installation cavity, the cavity cover and the filter core of the present application;

[0030] Fig. 4 It is a sectional view of the installation cavity of the present application;

[0031] Fig. 5 It is a sectional view of the baffle of the present application;

[0032] Fig. 6 It is a top view of the upper group of sub-cylinders of the present application.

[0033] Wherein, 1, reversing valve body, 11, installation cavity, 111, flow guide hole, 112, boss one, 12, cavity cover, 121, boss two, 122, pipeline installation hole, 13, filter element, 2, barrel, 21, top cylinder, 22, bottom cylinder, 221, sub-cylinder, 222, arc protrusion, 223, bottom hole, 3, baffle, 31, pressure relief hole, 32, mounting hole, 33, notch, 34, transverse hole, 4, spring one, 5, plugging mechanism, 51, movable plugging piece, 511, fan-shaped plugging piece, 512, cross rod, 513, protruding block, 514, spring two. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0035] Please refer to Figs. 1-3 The reversing valve with the anti-blocking function comprises a reversing valve body 1, installation cavities 11 are formed at oil suction ports and oil return ports on a main pipe of the reversing valve body 1, the bottom of the installation cavity 11 is communicated with the main pipe, a cavity cover 12 is arranged on the top of the installation cavity 11, the cavity cover 12 and the installation cavity 11 are connected by bolts, the cavity cover 12 is provided with pipeline installation holes 32 for connecting with oil suction pipelines and oil return pipelines, the top cover is connected with the installation cavity 11 by bolts, and sealing elements are arranged on the butt joint surfaces, and filter elements 13 are arranged in the installation cavities 11.

[0036] A boss one 112 is arranged at the bottom center of the installation cavity 11, a barrel 2 is fixedly arranged at the center of the boss one 112, the bottom of the filter element 13 is sleeved on the barrel 2, and the top of the filter element 13 faces the pipeline installation hole 32, and a boss two 121 is fixedly arranged on the inner wall of the cavity cover 12 around the pipeline installation hole 32, the end surface of the bottom of the filter element 13 is in contact with the boss one 112, and the end surface of the top of the filter element 13 is in contact with the boss two 121.

[0037] Meanwhile, sealing gaskets are arranged between the boss one 112 and the bottom end surface of the filter element 13 and between the boss two 121 and the top end surface of the filter element 13.

[0038] The scheme is improved according to the internal structure of the installation cavity 11, the main pipe and the valve body in the reversing valve body 1 are not changed, the above structure is still the prior art, and therefore, the specific structure will not be described again.

[0039] Please refer to Figs. 4-5The reversing valve with the anti-blocking function is provided with a flow guide hole 111 which is opened at the bottom wall of the installation cavity 11 and located outside the filter element 13, and the liquid flowing into the pipeline installation hole 32 enters the filter element 13, is filtered by the filter element 13 and then flows out from the installation hole 32 into the main pipe;

[0040] The baffle 3 is elastically connected in the barrel 2, and a pressure relief hole 31 which is equal in diameter to the pipeline installation hole 32 is opened in the baffle 3, and the baffle 3 is provided with a blocking mechanism 5, when the pressure in the installation cavity 11 increases to a certain degree, the baffle 3 is pushed downward by the liquid, and when the baffle 3 moves to a set distance, the blocking mechanism 5 opens to completely expose the pressure relief hole 31, and a bottom hole 223 which is equal in diameter to the pressure relief hole 31 is opened in the bottom wall of the barrel 2 opposite to the pressure relief hole 31, and a spring 4 is connected between the baffle 3 and the bottom wall of the barrel 2, and when the pressure in the installation cavity 11 increases, the liquid flows to push the baffle 3 to move downward along the vertical cylinder to compress the spring 4;

[0041] The barrel 2 is composed of a top barrel 21 at the upper side and a bottom barrel 22 at the lower side, the inner diameter of the top barrel 21 is smaller than the inner diameter of the bottom barrel 22, and the diameter of the baffle 3 is equal to the inner diameter of the top barrel 21;

[0042] The blocking mechanism 5 is elastically connected with the baffle 3, and when the baffle 3 slides in the top barrel 21, the blocking mechanism 5 blocks the pressure relief hole 31, and when the baffle 3 moves into the bottom barrel 22, the surrounding space increases, the blocking mechanism 5 expands to unblock the pressure relief hole 31 and completely expose the pressure relief hole 31.

[0043] Please refer to Figs. 4-6 The reversing valve with the anti-blocking function is provided with an installation hole 32 which is opened in the baffle 3 below the pressure relief hole 31, and the diameter of the installation hole 32 is larger than the diameter of the pressure relief hole 31, and a plurality of groups of transverse holes 34 which are in communication with the installation hole 32 are uniformly and spaced apart opened in the side edges of the baffle 3;

[0044] The blocking mechanism 5 is composed of a plurality of groups of movable blocking pieces 51 which are consistent in number and one-to-one corresponding in position, the movable blocking piece 51 includes a fan-shaped blocking piece 511 and a cross rod 512 which is fixed on the outer side edge of the fan-shaped blocking piece 511, the cross rod 512 slides through the transverse hole 34, the fan-shaped blocking piece 511 is located in the installation hole 32, and an enlarged protrusion 513 is fixed on the outer end of the cross rod 512, the size of the protrusion 513 is larger than the diameter of the transverse hole 34, a spring 514 is connected between the inner side wall of the transverse hole 34 and the fan-shaped blocking piece 511, when the baffle 3 slides in the top barrel 21, the spring 514 is in a stretched state, and the protrusion 513 slides in contact with the inner wall of the top barrel 21, at this time, the end heads of the plurality of groups of fan-shaped blocking pieces 511 contact to form a complete circular piece which is in contact with the top wall of the installation hole 32 and blocks the pressure relief hole 31;

[0045] The side edge of the baffle 3 has a notch 33 with the same size as the protrusion 513. When the groups of fan-shaped blocking pieces 511 block the pressure relief hole 31, the protrusion 513 is just clamped into the notch 33;

[0046] When the baffle 3 moves downward to drive the protrusion 513 to move into the bottom cylinder 22, the protrusion 513 is driven to move outward by the rebound force of the spring 2, so that the protrusion 513 moves outward in the transverse direction and contacts the inner wall of the bottom cylinder 22, thereby driving the fan-shaped blocking pieces 511 to also move outward in the transverse direction to approach the position of the hole wall of the mounting hole 32. The groups of fan-shaped blocking pieces 511 are away from each other, and the pressure relief hole 31 is completely exposed. At this time, the flow in the inner cavity of the filter element 13 can directly pass through the pressure relief hole 31 to the lower side of the baffle 3, and then pass through the bottom hole 223 on the bottom wall of the bottom cylinder 22 into the main pipe;

[0047] Before the filter element 13 is replaced, the protrusion 513 cannot continue to move upward because it is blocked by the part of the bottom wall of the top cylinder 21 that protrudes from the bottom cylinder 22, so that the pressure relief hole 31 always remains in a fully open state, ensuring that the pressure in the installation cavity 11 is in a normal state, and avoiding that the sealing elements and sealing gaskets are subjected to high pressure for a long time to cause fatigue.

[0048] Please refer to Figs. 4-6 The reversing valve with the anti-blocking function is composed of two groups of sub-cylinders 221 connected in rotation, the upper group of sub-cylinders 221 is fixedly connected with the top cylinder 21, and the lower group of sub-cylinders 221 is fixedly connected with the boss 112. The bottom hole 223 is located on the bottom wall of the lower group of sub-cylinders 221, and there is a sealing element on the contact surface of the two groups of sub-cylinders 221.

[0049] The inner wall of the upper group of sub-cylinders 221 is fixedly connected with arc-shaped protrusions 222 corresponding to the number and position of the protrusions 513. The protrusion height of the arc-shaped protrusions 513 is equal to the difference between the inner radius of the bottom cylinder 22 and the top cylinder 21.

[0050] When the filter element 13 works, the arc-shaped protrusions 222 are misaligned with the protrusions 513. When the protrusions 513 move into the bottom cylinder 22 and contact the bottom wall of the top cylinder 21, the protrusions 513 are located between the adjacent two groups of arc-shaped protrusions 222. When the filter element 13 is replaced, the cavity cover 12 is first opened, then the old filter element 13 is removed, and the upper group of sub-cylinders 221 is rotated together by rotating the top cylinder 21, so that the arc-shaped protrusions 222 gradually approach the protrusions 513 and press the protrusions 513 to compress the spring 2. When the protrusions 513 slide to the innermost side of the arc-shaped protrusions 222 close to the center line of the bottom cylinder 22, the groups of fan-shaped blocking pieces 511 again approach each other to block the pressure relief hole 31, and the baffle 3 moves upward into the top cylinder 21 under the rebound of the spring 1, realizing the upward reset of the baffle 3.

[0051] Then reverse twist top cylinder 21 and upper sub-cylinder 221 reset again let arc convex 222 and protruding piece 513 misalignment can;

[0052] Finally, put in the new filter element 13, close the cavity cover 12 again, that is, the replacement of the filter element 13 is completed.

[0053] The un-disclosed part in the utility model is all prior art, and the specific structure and working principle will not be repeated.

[0054] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A reversing valve with anti-blocking function, comprising a reversing valve body (1), an installation cavity (11) is arranged at the oil suction port and the oil return port of the main pipe of the reversing valve body (1), a cavity cover (12) is arranged at the top cover, a pipeline installation hole (32) is arranged on the cavity cover (12), and sealing elements are arranged on the butt joint surface, a filter element (13) is arranged in the installation cavity (11), characterized in that: a cylinder (2) is fixedly arranged at the center of the bottom of the installation cavity (11), the bottom of the filter element (13) is sleeved on the cylinder (2), and the top of the filter element (13) is opposite to the pipeline installation hole (32); a flow guide hole (111) is arranged at the position close to the side wall of the bottom wall of the installation cavity (11), and the flow guide hole (111) is located outside the filter element (13); a baffle (3) is elastically connected in the cylinder (2), a pressure relief hole (31) with the same diameter as the pipeline installation hole (32) is arranged on the baffle (3), and a plugging mechanism (5) is arranged in the pressure relief hole (31); the cylinder (2) is composed of an upper top cylinder (21) and a lower bottom cylinder (22), the inner diameter of the top cylinder (21) is smaller than the inner diameter of the bottom cylinder (22), the diameter of the baffle (3) is equal to the inner diameter of the top cylinder (21), when the pressure in the installation cavity (11) increases to a certain degree, the baffle (3) is pushed downward by the liquid, when the baffle (3) enters the bottom cylinder (22) from the top cylinder (21), the plugging mechanism (5) expands to completely expose the pressure relief hole (31). a bottom hole (223) with the same diameter as the pressure relief hole (31) is arranged on the bottom wall of the bottom cylinder (22), and a spring (4) is connected between the baffle (3) and the bottom wall of the bottom cylinder (22); the plugging mechanism (5) is elastically connected with the baffle (3). an installation hole (32) is arranged below the pressure relief hole (31) on the baffle (3), the diameter of the installation hole (32) is larger than the diameter of the pressure relief hole (31), and a plurality of groups of transverse holes (34) are uniformly and interval ly arranged on the side edges of the baffle (3) and communicated with the installation hole (32); the plugging mechanism (5) is composed of a plurality of movable plugging elements (51) corresponding to the transverse holes (34), the movable plugging element (51) comprises a fan-shaped plugging piece (511) and a horizontal rod (512) fixed on the outer side edge of the fan-shaped plugging piece (511), the horizontal rod (512) is slidably arranged through the transverse hole (34), the fan-shaped plugging piece (511) is located in the installation hole (32), an enlarged protrusion (513) is fixed on the outer end of the horizontal rod (512), a spring (514) is connected between the inner side wall of the transverse hole (34) and the fan-shaped plugging piece (511), when the baffle (3) is in the top cylinder (21), the spring (514) is in a stretched state, at this time, the plurality of groups of fan-shaped plugging pieces (511) are in contact to form a complete circular piece, the top wall of the installation hole (32) is contacted and the pressure relief hole (31) is blocked. ​ 2. The reversing valve with anti-blocking function according to claim 1, characterized in that: ​ ​ 3. The reversing valve with anti-blocking function according to claim 2, characterized in that: ​ ​ When the baffle (3) enters the bottom cylinder (22), the convex block (513) drives the horizontal rod (512) to move out under the rebound force of spring two (514), and multiple groups of fan-shaped blocking pieces (511) move away from each other, and the pressure relief hole (31) is completely exposed.

4. The reversing valve with anti-blocking function according to claim 3, characterized in that: The bottom cylinder (22) is composed of two groups of upper and lower sub-cylinders (221) connected by rotation, the upper sub-cylinder (221) is fixedly connected with the top cylinder (21), the lower sub-cylinder (221) is fixedly connected with the bottom wall of the installation cavity (11), and the contact surfaces of the two groups of sub-cylinders (221) are provided with sealing elements; An arc convex block (513) is fixedly arranged on the inner wall of the upper sub-cylinder (221), the number of the arc convex blocks (513) is equal to that of the convex blocks (513), and the positions of the arc convex blocks (513) correspond to those of the convex blocks (513) one by one, and the height of the arc convex block (513) is equal to the difference between the inner radius of the bottom cylinder (22) and that of the top cylinder (21); The upper sub-cylinder (221) is rotated to adjust the misalignment of the arc convex block (513) and the convex block (513) in the same plane or the stacking of the arc convex block (513) and the convex block (513) in the plane.

5. The reversing valve with anti-blocking function according to claim 1, characterized in that: Sealing washers are arranged between the top and bottom openings of the filter element (13) and the contact surfaces between the cavity cover (12) and the bottom wall of the installation cavity (11).

6. The reversing valve with anti-blocking function according to claim 3, characterized in that: The side edge of the baffle (3) has a notch (33) with the same size as the convex block (513).

Images