One-way check valve

Abstract

The utility model discloses a one-way check valve which comprises a body, the body is a step-shaped cylindrical structural body with external assembly positions at two ends, the body comprises an upper cover, a lower cover and a valve core, the upper cover and the lower cover form a closed containing cavity, the valve core is arranged in the containing cavity and comprises a return guide column and a flexible valve body, and the flexible valve body is arranged on the return guide column. The return guide column is vertically arranged in the upper cover corresponding to the liquid inlet, the return guide column is of a hollow column structure with a conical section, a hemispherical closed end is arranged at the top of the return guide column, flow guide holes are symmetrically formed in the two sides, close to the hemispherical closed end, of the return guide column, the flexible valve body is of a nipple-shaped structure, the return guide column is sleeved with the flexible valve body, and the flexible valve body is connected with the return guide column. A contraction hole is formed in the sucking end of the flexible valve body corresponding to the hemispherical closed end in a penetrating mode, and the flexible valve body is movably connected with the return guide column. The anti-backflow valve is simple in structure, small in size, convenient to install, use and maintain, long in service life, safe, reliable, good in anti-backflow effect, low in production cost and high in popularization value.

Description

Technical Field

[0001] The utility model relates to the technical field of rehabilitation equipment, in particular to a one-way check valve. Background Art

[0002] A one-way valve can also be called a check valve or a non-return valve. The check valve is opened and closed by the pressure difference between the inlet and outlet of the valve. It is usually used in hydraulic or pneumatic systems to prevent oil or gas from flowing back. In rehabilitation equipment and medical equipment, if the one-way valve fails or is blocked, it must be replaced in time, which will cause serious accidents. Replacing the one-way valve will invisibly increase the cost of use.

[0003] A plunger pump check valve is currently available on the market and includes a valve body, a steel ball, a spring, and a spring seat. The valve body has an oil inlet and an oil outlet, and a valve seat disposed therebetween. The spring is disposed between the spring seat and the steel ball, with an oil outlet hole at its center. The steel ball is pressed against the valve seat under the action of the spring force. The valve body also has a flow hole with a diameter larger than the oil outlet and adjacent to the oil outlet. The spring seat is provided with at least two oil grooves communicating with the flow hole. The flow hole adjacent to the oil outlet increases the flow cross-sectional area of ​​the valve body cavity. The oil grooves are provided on the outer circumference of the spring seat to facilitate the flow of pressurized oil from the oil outlet. While this solves the problem of the steel ball clogging the oil outlet hole under excessive pressure, causing the check valve to abnormally close, and improves its reliability, the plunger pump check valve has a complex structure and is relatively large, making it unsuitable for use in thinner pipelines. If the size is reduced, reliability cannot be guaranteed.

[0004] Therefore, it is urgent for engineers and technicians in this field to develop a one-way check valve with simple structure, small size, easy use, reliable sealing and low production cost to meet the needs of current rehabilitation equipment and medical equipment. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a one-way check valve which has a simple structure, a small volume, is easy to use, safe and reliable, and has a low production cost.

[0006] In order to solve the above technical problems, the technical solution of the utility model is:

[0007] A one-way check valve comprises a body, the body being a stepped cylindrical structure with external assembly positions at both ends, the body comprising an upper cover, a lower cover, and a valve core, the lower cover being half-embedded in the upper cover, the upper cover and the lower cover forming a closed accommodating cavity, the upper cover and the lower cover being snap-connected, the upper cover and the lower cover being respectively provided with a liquid inlet and a liquid outlet corresponding to the external assembly positions, the valve core being arranged in the accommodating cavity, the valve core comprising a return guide column and a flexible valve body, the return guide column The guide column is vertically arranged in the upper cover corresponding to the liquid inlet. The return guide column is a hollow cylindrical structure with a conical cross-section. The top of the return guide column is provided with a hemispherical closed end. The return guide column is symmetrically provided with diversion holes on both sides adjacent to the hemispherical closed end. The flexible valve body is a nipple-shaped structure. The flexible valve body is sleeved on the return guide column. The suction end of the flexible valve body is corresponding to the hemispherical closed end and is penetrated by a contraction hole. The flexible valve body is movably connected to the return guide column.

[0008] In the above structure, the interior of the flexible valve body is provided with a concave cavity matching the return guide column, and the flexible valve body includes a fixed end and a sucking end. The fixed end is circumferentially provided with a stepped annular flange, and the sucking end is circumferentially provided with a flexible return stretching ring portion, a flexible fluid-sealed ring portion, and a flexible return guide ring portion. The flexible return stretching ring portion, the flexible fluid-sealed ring portion, and the flexible return guide ring portion are axially arranged in sequence between the annular flange and the shrinkage hole, and the flexible return stretching ring portion, the flexible fluid-sealed ring portion, and the flexible return guide ring portion are transitionally connected in sequence.

[0009] In the above structure, the return guide post is coaxially arranged with the upper cover, the outer surface of the return guide post is a smooth surface, and the return guide post is slidably connected to the sucking end.

[0010] In the above structure, the outside of the upper cover is integrally provided with a first external assembly position, the inside of the upper cover is provided with a first accommodating cavity, the return guide column is integrally arranged in the first accommodating cavity, the inside of the first external assembly position is provided with a flow channel corresponding to the return guide column, the flow channel is respectively arranged to penetrate the liquid inlet and the guide hole, and the side of the first accommodating cavity is symmetrically provided with a conical clamping hole.

[0011] In the above structure, the lower cover includes a second accommodating chamber and a second external assembly position. The second external assembly position is integrally arranged on the outside of the second accommodating chamber. The liquid outlet extends through the second accommodating chamber, and the second accommodating chamber extends into the interior of the first accommodating chamber. The second accommodating chamber matches the first accommodating chamber. The installation position of the annular flange and the movable space of the flexible valve body are constructed between the first accommodating chamber and the second accommodating chamber. Limiting buckles are provided on both sides of the second accommodating chamber corresponding to the conical snap-fit ​​holes.

[0012] In the above structure, an annular limiter is convexly provided on the outer circumference of the bottom of the second accommodating cavity, and the annular limiter matches the first accommodating cavity. The outer side of the bottom of the second accommodating cavity is flush with the opening end of the first accommodating cavity.

[0013] In the above structure, there are two limit buckles, and the tops of the two limit buckles are provided with smooth transition slopes. The two limit buckles are matched with the corresponding conical clamping holes respectively, and the top surfaces of the two limit buckles are matched with the first accommodating cavity.

[0014] The above structure also includes a sealing ring, which includes a first sealing ring and a second sealing ring. The first sealing ring is sleeved on the bottom of the return guide column, and the second sealing ring is arranged at the installation position corresponding to the second accommodating cavity and the annular flange. The flexible valve body is sealed and connected to the bottom of the return guide column, and the flexible valve body is sealed and connected to the upper cover and the lower cover respectively.

[0015] In the above structure, the flexible valve body is made of any flexible plastic material including silicone material.

[0016] The beneficial effects of the present invention are:

[0017] The utility model greatly enhances the non-return effect by disposing a return guide post with a conical cross section inside the valve body, and sleeves a valve core with a contraction hole at the end thereof on the return guide post. The valve core and the return guide post are connected in a sliding and sealing manner, thereby greatly improving the non-return effect. The utility model has a simple structure, a small size, is easy to install, use, and maintain, has a long service life, is safe and reliable, has a good non-return effect, and has a low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of an embodiment of a one-way check valve of the utility model;

[0019] Figure 2 This is a cross-sectional view of an embodiment of a one-way check valve of the present utility model;

[0020] Figure 3 This is the second cross-sectional view of an embodiment of the one-way check valve of the present utility model;

[0021] Figure 4 This is a structural diagram of the valve core in an embodiment of the one-way check valve of the present utility model;

[0022] Figure 5 This is a structural exploded view of an embodiment of a one-way check valve of the present utility model.

[0023] In the figure, 1-main body, 2-upper cover, 3-lower cover, 4-valve core, 5-return guide column, 6-guide hole, 7-flexible valve body, 71-flexible return stretching ring, 72-flexible fluid sealing ring, 73-flexible return guide ring, 8-contraction hole, 9-first external assembly position, 10-second external assembly position, 11-conical clamping hole, 12-limiting buckle, 13-first sealing ring, 14-second sealing ring. DETAILED DESCRIPTION

[0024] The following further describes specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the descriptions of these embodiments are intended to aid understanding of the present invention and do not constitute limitations on the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0025] like Figure 1-5 As shown, a one-way check valve includes a body. The body 1 is a stepped cylindrical structure with external assembly positions at both ends. The body 1 includes an upper cover 2, a lower cover 3, and a valve core 4. The lower cover 3 is semi-embedded in the upper cover 2. The upper cover 2 and the lower cover 3 are constructed into a closed accommodating cavity. The upper cover 2 and the lower cover 3 are snap-connected. The upper cover 2 and the lower cover 3 are respectively provided with a liquid inlet and a liquid outlet corresponding to the external assembly positions. The valve core 4 is arranged in the accommodating cavity. The valve core 4 includes a return guide column 5 and a flexible valve body. 7. The return guide post 5 is vertically arranged in the upper cover 2 corresponding to the liquid inlet. The return guide post 5 is a hollow cylindrical structure with a conical cross-section. The top of the return guide post 5 is provided with a hemispherical closed end. The return guide post 5 is symmetrically provided with diversion holes 6 on both sides adjacent to the hemispherical closed end. The flexible valve body 6 is a nipple-shaped structure. The flexible valve body 7 is sleeved on the return guide post 5. The sucking end of the flexible valve body 6 corresponds to the hemispherical closed end and is penetrated by a contraction hole 8. The flexible valve body 7 is movably connected to the return guide post 5.

[0026] Specifically, the main body 1 is a stepped cylindrical cavity structure, the upper cover 2 and the lower cover 3 are made of plastic material, there are at least two guide holes 7, the two guide holes 6 are symmetrically arranged, and the diameters of the liquid inlet and the liquid outlet are the same.

[0027] In a preferred embodiment of the present utility model, the interior of the flexible valve body 7 is provided with a concave cavity matching the return guide column 5, and the flexible valve body 6 includes a fixed end and a sucking end. The fixed end is circumferentially provided with a stepped annular flange, and the sucking end is circumferentially provided with a flexible return stretching ring portion 71, a flexible fluid-tight ring portion 72, and a flexible return guide ring portion 73. The flexible return stretching ring portion 71, the flexible fluid-tight ring portion 72, and the flexible return guide ring portion 73 are axially arranged in sequence between the annular flange and the shrinkage hole 8, and the flexible return stretching ring portion 71, the flexible fluid-tight ring portion 72, and the flexible return guide ring portion 73 are transitionally connected in sequence.

[0028] Specifically, the flexible return stretching ring portion 71 , the flexible fluid-tight ring portion 72 , and the flexible return guide ring portion 73 are integrally arranged circumferentially, and the wall thicknesses of the flexible return stretching ring portion 71 , the flexible fluid-tight ring portion 72 , and the flexible return guide ring portion 73 are different.

[0029] In a preferred embodiment of the present invention, the return guide post 5 is coaxially arranged with the upper cover 2 , the outer surface of the return guide post 5 is a smooth surface, and the return guide post 5 is slidably connected to the sucking end.

[0030] Specifically, the return guide post 5 and the first external assembly position 9 are respectively located on both sides of the upper cover 2 , and the return guide post 5 , the first external assembly position 9 and the upper cover 2 are integrally formed.

[0031] In a preferred embodiment of the present invention, a first external assembly position 9 is integrally provided on the outside of the upper cover 2, a first accommodating chamber is provided on the inside of the upper cover 2, a return guide column 5 is integrally arranged in the first accommodating chamber, a flow channel is provided inside the first external assembly position 9 corresponding to the return guide column 5, the flow channel is respectively penetrated by the liquid inlet and the guide hole 7, and a conical clamping hole 11 is symmetrically provided on the side of the first accommodating chamber.

[0032] In a preferred embodiment of the present invention, the lower cover 3 includes a second accommodating chamber and a second external assembly position 10. The second external assembly position 10 is integrally arranged on the outside of the second accommodating chamber. The liquid outlet extends through the second accommodating chamber. The second accommodating chamber extends into the interior of the first accommodating chamber. The second accommodating chamber matches the first accommodating chamber. An annular flange installation position and a movable space for the flexible valve body 6 are constructed between the first accommodating chamber and the second accommodating chamber. Limiting buckles 12 are provided on both sides of the second accommodating chamber corresponding to the conical snap-fit ​​holes 11.

[0033] Specifically, the first accommodating cavity matches the second accommodating cavity, and the first accommodating cavity and the second accommodating cavity are locked and sealed by corresponding conical clamping holes 11 on both sides provided with limiting buckles 12.

[0034] In a preferred embodiment of the present invention, an annular limiter is circumferentially protruded from the outer side of the bottom of the second accommodating cavity, which matches the first accommodating cavity, and the outer side of the bottom of the second accommodating cavity is flush with the opening end of the first accommodating cavity.

[0035] Specifically, the second external assembly position 10 is coaxially arranged with the second accommodating cavity, and the second external assembly position 10 is connected to the second accommodating cavity via an internally arranged flow channel. The annular limiter is flush with the bottom outer side surface of the second accommodating cavity.

[0036] In a preferred embodiment of the present invention, there are two limiting buckles 12, and the tops of the two limiting buckles 12 are provided with smooth transition slopes. The two limiting buckles 12 respectively match the corresponding conical clamping holes 11, and the top surfaces of the two limiting buckles 12 match the first accommodating cavity.

[0037] Specifically, the buckle parts of the two limiting buckles are elastic ends, and the tops of the two limiting buckles are provided with smooth inclined surfaces to facilitate disassembly and assembly.

[0038] In a preferred embodiment of the present invention, a sealing ring is further included, which includes a first sealing ring 13 and a second sealing ring 14. The first sealing ring 13 is sleeved on the bottom of the return guide column 5, and the second sealing ring 14 is arranged at the installation position corresponding to the second accommodating cavity and the annular flange. The flexible valve body 7 is sealed and connected to the bottom of the return guide column 5, and the flexible valve body 6 is sealed and connected to the upper cover 2 and the lower cover 3 respectively.

[0039] In a preferred embodiment of the present invention, the flexible valve body 7 is made of any flexible plastic material including silicone material.

[0040] Specifically, the end of the return guide post 5 away from the hemispherical closed end is provided with a groove for installing the first sealing ring 13, and the connection part of the annular flange 5 adjacent to the second accommodating cavity is embedded with a groove for installing the second sealing ring 14.

[0041] The working principle of this utility model:

[0042] The second external assembly position 9 of the main body 1 is movably connected to the liquid inlet pipe. When the liquid flows into the return guide pillar 5 from the liquid inlet, the flexible valve body 6 is sleeved on the return guide pillar 5 and seals the two guide holes 6. When the pressure of the return guide pillar 5 increases, the contact surface pressure of the two guide holes 7 and the flexible valve body 6 gradually increases. After the sucking end of the flexible valve body 7 is subjected to corresponding pressure, the flexible return stretching ring portion 71, the flexible fluid sealing ring portion 72, and the flexible return guide ring portion 73 of the flexible valve body 6 successively shrink along the return guide pillar 5 toward the fixed end, the shrinkage hole 8 gradually expands, the two guide holes 6 open, and the liquid flows into the second accommodating chamber through the two guide holes 6 and then flows out through the liquid outlet. When the pressure in the return guide pillar 5 decreases, the flexible valve body 7 will gradually slide toward the two guide holes 6 at the hemispherical closed end of the return guide pillar 5, and close it to achieve one-way check.

[0043] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A one-way check valve, comprising a body, wherein the body is a stepped cylindrical structure with external assembly positions at both ends, characterized in that: The main body includes an upper cover, a lower cover, and a valve core, and the lower cover is semi-embedded in the upper cover, and the upper cover and the lower cover are constructed into a closed accommodating chamber, and the upper cover and the lower cover are snap-connected, and the upper cover and the lower cover are respectively provided with a liquid inlet and a liquid outlet corresponding to the external assembly position, and the valve core is arranged in the accommodating chamber, and the valve core includes a return guide post and a flexible valve body, and the return guide post is vertically arranged in the upper cover corresponding to the liquid inlet, the return guide post is a hollow cylindrical structure with a conical cross-section, the top of the return guide post is provided with a hemispherical closed end, and the return guide post is symmetrically provided with diversion holes on both sides adjacent to the hemispherical closed end, and the flexible valve body is a nipple-shaped structure, the flexible valve body is sleeved on the return guide post, and the sucking end of the flexible valve body is provided with a contraction hole corresponding to the hemispherical closed end, and the flexible valve body is movably connected to the return guide post.

2. The one-way check valve according to claim 1, characterized in that: The interior of the flexible valve body is provided with a concave cavity matching the return guide column, and the flexible valve body includes a fixed end and a sucking end. The fixed end is circumferentially provided with a stepped annular flange, and the sucking end is circumferentially provided with a flexible return stretching ring portion, a flexible fluid-tight ring portion, and a flexible return guide ring portion. The flexible return stretching ring portion, the flexible fluid-tight ring portion, and the flexible return guide ring portion are axially arranged in sequence between the annular flange and the shrinkage hole, and the flexible return stretching ring portion, the flexible fluid-tight ring portion, and the flexible return guide ring portion are transitionally connected in sequence.

3. The one-way check valve according to claim 2, characterized in that: The return guide post is coaxially arranged with the upper cover, the outer surface of the return guide post is a smooth surface, and the return guide post is slidably connected with the sucking end.

4. The one-way check valve according to claim 3, characterized in that: The outside of the upper cover is integrally provided with a first external assembly position, the inside of the upper cover is provided with a first accommodating cavity, the return guide column is integrally arranged in the first accommodating cavity, the inside of the first external assembly position is provided with a flow channel corresponding to the return guide column, the flow channel is respectively provided through the liquid inlet and the guide hole, and the side of the first accommodating cavity is symmetrically provided with a conical clamping hole.

5. The one-way check valve according to claim 4, characterized in that: The lower cover includes a second accommodating chamber and a second external assembly position. The second external assembly position is integrally arranged on the outside of the second accommodating chamber. The liquid outlet extends through the second accommodating chamber. The second accommodating chamber extends into the interior of the first accommodating chamber. The second accommodating chamber matches the first accommodating chamber. The mounting position of the annular flange and the movable space of the flexible valve body are constructed between the first accommodating chamber and the second accommodating chamber. Limiting buckles are provided on both sides of the second accommodating chamber corresponding to the conical snap-fit ​​holes.

6. The one-way check valve according to claim 5, characterized in that: An annular limiter is convexly provided on the outer circumference of the bottom of the second accommodating cavity, and the annular limiter matches the first accommodating cavity. The outer side of the bottom of the second accommodating cavity is flush with the opening end of the first accommodating cavity.

7. The one-way check valve according to claim 5, characterized in that: There are two limit buckles, and the tops of the two limit buckles are provided with smooth transition inclined surfaces. The two limit buckles are matched with the corresponding conical clamping holes respectively, and the top surfaces of the two limit buckles are matched with the first accommodating cavity.

8. The one-way check valve according to claim 1, characterized in that: It also includes a sealing ring, which includes a first sealing ring and a second sealing ring. The first sealing ring is sleeved on the bottom of the return guide column, and the second sealing ring is arranged at the installation position corresponding to the second accommodating cavity and the annular flange. The flexible valve body is sealed and connected to the bottom of the return guide column, and the flexible valve body is sealed and connected to the upper cover and the lower cover respectively.

9. The one-way check valve according to claim 1, characterized in that: The flexible valve body is made of any flexible plastic material including silicone material.

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