Check valve

Abstract

The utility model discloses a one-way check valve, the valve body is the cylindrical structure body who is equipped with the connecting part respectively at both ends, the valve body includes front shell, rear shell, soft glue valve core, and the soft glue valve core is umbrella structure body, and the inside bottom of front shell is equipped with the horn shape assembly position, and the rear shell half-embedded setting is in the inside of front shell, and the soft glue valve core movable setting is in the accommodation cavity of front shell, rear shell structure. The utility model discloses through the improvement soft glue valve core structure, sets up the positioning structure of matching with the guide positioning column on the soft glue valve core in the rear shell, makes the soft glue valve core and the top position horn shape of front shell excess fit and always keep the central position, and makes the clearance of guide positioning column and the side wall of rear shell, thereby guaranteeing the parameter of gas liquid when passing is invariable, can make umbrella portion and the horn shape assembly position sliding seal connection of front shell into closed state, prevents the liquid backflow, greatly improved the non -return effect. The utility model discloses simple structure, small, convenient to use, long life, good reliability, low in cost.

Description

Technical Field

[0001] This utility model relates to the field of rehabilitation equipment technology, and in particular to a one-way check valve. Background Technology

[0002] A check valve is used to determine whether to open or close based on the pressure difference between its inlet and outlet. It is typically used in hydraulic or pneumatic systems to prevent the backflow of oil or gas. In rehabilitation equipment and medical devices, if a check valve fails or becomes blocked, it must be replaced promptly to avoid serious accidents. Replacing a check valve will inevitably increase the operating cost.

[0003] While the currently available plunger pump check valves have solved the problem of abnormal closure caused by the steel ball becoming blocked in the outlet under overpressure, thus improving the reliability of the check valve, they are complex in structure, expensive, and bulky, making them unsuitable for narrower pipelines. Reducing their size would decrease the volume of the steel ball and spring, compromising flow rate. Furthermore, the steel ball and spring are prone to rust and secondary oxidation, and the spring's elasticity weakens with increased usage frequency, leading to decreased sealing performance and compromised reliability. Diaphragm check valves, while cost-effective and compact, are susceptible to issues such as diaphragm failure to retract or incomplete return, and their pressure is uncontrollable, limiting their application to a limited range.

[0004] Our company has disclosed a one-way check valve, disclosure number CN223344779U, which has significant improvements in structure, size, and reliability compared to one-way check valves on the market. Although it can also be used in thinner pipelines, in practical applications, it has been found that there is still room for improvement in terms of size, structure, and cost. Moreover, the existing types of one-way check valves are limited, and users have less choice, which cannot meet current needs. Therefore, there is an urgent need for engineers in this field to develop a one-way check valve that is smaller in size, simpler in structure, easier to use, more reliable, has a longer service life, and lower in production cost to meet the current needs of rehabilitation equipment and medical devices. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a one-way check valve that is simple in structure, small in size, easy to use, long in service life, safe and reliable, has good sealing performance and low cost.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] A one-way check valve includes a valve body, which is a cylindrical structure with connecting portions at both ends. The valve body includes a front shell, a rear shell, and a soft rubber valve core. The soft rubber valve core is an umbrella-shaped structure, including a hemispherical plug, an umbrella-shaped part, and a guide positioning post. The hemispherical plug and the guide positioning post are integrally disposed on both sides of the umbrella-shaped part. The front shell and the rear shell are both cavity structures with openings at the front ends. The bottom of the front shell has a flared mounting position. The rear shell is semi-embedded inside the front shell. The soft rubber valve core is movably disposed within the accommodating cavity formed by the front shell and the rear shell. The umbrella-shaped part is interference-fitted with the flared mounting position.

[0008] In the above structure, the interior of the front shell is a trumpet-shaped structure. The bottom of the interior of the front shell is provided with an annular limiting protrusion along the top circumference of the trumpet-shaped mounting position. The inner diameter of the annular limiting protrusion is larger than the outer diameter of the umbrella part. The trumpet-shaped mounting position matches the umbrella part.

[0009] In the above structure, the rear shell is a cavity structure with a stepped cross section. The outer side of the front end of the rear shell matches the inner side of the front shell. The front end of the rear shell is provided with multiple guide ribs vertically along the inner sidewall. The multiple guide ribs are symmetrically arranged. The multiple guide ribs are spaced apart from the guide positioning post. A flow channel is constructed between the multiple guide ribs. The bottom inner side of the rear shell is provided with a cross-shaped limiting rib.

[0010] In the above structure, the connecting part includes a first connecting part and a second connecting part. The first connecting part is integrally formed on the outer side of the front shell. The interior of the first connecting part is provided with a liquid inlet hole. The liquid inlet hole is connected through the front shell. The liquid inlet hole coincides with the central axis of the front shell. The free end of the first connecting part is provided with a rounded corner on the outer circumferential direction.

[0011] In the above structure, the second connecting part is integrally disposed on the outer side of the rear shell, and the second connecting part is provided with a liquid outlet hole inside. The liquid outlet hole coincides with the central axis of the rear shell and is connected through the guide groove. The free end of the second connecting part is provided with a rounded corner on the outer circumference, and the cross-shaped limiting rib is disposed adjacent to the liquid outlet hole.

[0012] In the above structure, the central axes of the hemispherical plug, umbrella, and guide positioning post coincide, and there is an movable gap between the free end of the guide positioning post and the cross-shaped limiting rib.

[0013] In the above structure, the gap between one side of the multiple guide ribs and the guide positioning post is greater than 0.25mm.

[0014] In the above structure, the hemispherical plug is located at the top of the umbrella part, the hemispherical plug is provided corresponding to the liquid inlet hole, and the diameter of the hemispherical plug is smaller than the diameter of the liquid inlet hole.

[0015] In the above structure, the front shell and the rear shell are made of plastic material.

[0016] In the above structure, the soft rubber valve core is made of any flexible plastic material, including silicone.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention improves the structure of the soft rubber valve core and adds a positioning structure on the rear shell that matches the guide positioning post on the soft rubber valve core. This ensures that the flared interference fit between the soft rubber valve core and the top of the front shell remains centered, and that the gap between the guide positioning post and the side walls of the front and rear shells remains constant. This guarantees that the parameters remain constant when gas and liquid pass through, and allows the flared assembly of the umbrella-shaped part and the front shell to slide and seal in a closed state, preventing liquid backflow and greatly improving the check valve effect. This invention has a simple structure, small size, is easy to use, has a long service life, high reliability, and low cost. Attached Figure Description

[0019] Figure 1 This is a front view of an embodiment of the one-way check valve of this utility model;

[0020] Figure 2 This is one of the cross-sectional views of an embodiment of the one-way check valve of this utility model;

[0021] Figure 3 This is a second cross-sectional view of an embodiment of the one-way check valve of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of an embodiment of the one-way check valve of this utility model;

[0023] Figure 5 This is a schematic diagram of the soft rubber valve core in an embodiment of the one-way check valve of this utility model.

[0024] In the figure, 1-front shell, 2-rear shell, 3-soft rubber valve core, 31-hemispherical plug, 32-umbrella part, 33-guide positioning post, 4-first connecting part, 5-second connecting part, 6-liquid inlet, 7-liquid outlet. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1-5 As shown, a one-way check valve includes a valve body, which is a cylindrical structure with connecting parts at both ends. The valve body includes a front shell 1, a rear shell 2, and a soft rubber valve core 3. The soft rubber valve core 3 is an umbrella-shaped structure, which includes a hemispherical plug 31, an umbrella part 32, and a guide positioning post 33. The hemispherical plug 31 and the guide positioning post 33 are integrally disposed on both sides of the umbrella part 32. The front shell 1 and the rear shell 2 are both cavity structures with openings at the front ends. The bottom of the front shell 1 is provided with a horn-shaped mounting position. The rear shell 2 is semi-embedded in the interior of the front shell 1. The soft rubber valve core 3 is movably disposed in the accommodating cavity constructed by the front shell 1 and the rear shell 2. The umbrella part 32 is interference-fitted with the horn-shaped mounting position.

[0027] Specifically, in this embodiment, the umbrella part 32 (the outer top of the umbrella) of the soft rubber valve core 3 is interference-fitted with the trumpet-shaped mounting position of the front shell 1 by elastic tension, and the side wall of the front shell 1 is sealed to the umbrella part 32.

[0028] A gap is provided between the side wall of the front shell 1 and the umbrella part 32 to allow gas or liquid to pass through. When liquid flows in from the liquid inlet, the liquid pushes the umbrella part 32 (the outer top of the umbrella) of the soft rubber valve core 3, and a gap is formed between the side wall of the front shell 1 and the umbrella part 32 (the outer top of the umbrella). The liquid flows in through the gap and enters the receiving cavity through the guide groove, and finally flows out from the liquid outlet on the rear shell.

[0029] When liquid flows back from the outlet hole, the liquid will push the umbrella part 32 (the inner top of the umbrella) of the soft rubber valve core 3, causing the inner top of the umbrella part 32 to move under pressure, and causing the umbrella part 32 to slide and seal with the trumpet-shaped assembly position of the front shell 1 to form a closed state, preventing liquid from flowing back.

[0030] In a preferred embodiment of the present invention, the interior of the front shell 1 is a trumpet-shaped structure. The bottom of the interior of the front shell 1 is provided with an annular limiting protrusion along the top circumference of the trumpet-shaped mounting position. The inner diameter of the annular limiting protrusion is larger than the outer diameter of the umbrella part 32, and the trumpet-shaped mounting position matches the umbrella part 32.

[0031] Specifically, in this embodiment, the annular limiting protrusion is used to restrict the assembly of the rear shell, so as to ensure that the soft rubber valve core 3 has sufficient room for movement after the front shell 1 and the rear shell 2 are assembled, so as to ensure that the soft rubber valve core 3 has a good stopping effect.

[0032] In a preferred embodiment of the present invention, the rear shell 2 is a cavity structure with a stepped cross section. The outer side of the front end of the rear shell 2 matches the inner side of the front shell 1. The front end of the rear shell 2 is provided with multiple guide ribs vertically along the inner sidewall. The multiple guide ribs are symmetrically arranged. The multiple guide ribs are spaced apart from the guide positioning post 33. A flow channel is constructed between the multiple guide ribs. The bottom inner side of the rear shell 2 is provided with a cross-shaped limiting rib.

[0033] Specifically, in this embodiment, multiple guide ribs are constructed with hole-like structures that match the guide positioning posts, and a flow channel is constructed between adjacent guide ribs to allow liquid to flow through.

[0034] Specifically, in this embodiment, there are at least three guide ribs to ensure the anti-return effect of the guide positioning post 33.

[0035] In a preferred embodiment of the present invention, the connecting part includes a first connecting part 4 and a second connecting part 5. The first connecting part 4 is integrally disposed on the outer side of the front shell 1. The interior of the first connecting part 4 is provided with a liquid inlet hole 6, which is connected through the front shell 1. The liquid inlet hole 6 coincides with the central axis of the front shell 1. The free end of the first connecting part 4 is provided with a rounded corner on the outer circumferential direction.

[0036] Specifically, in this embodiment, the liquid inlet 6 is provided through the front shell 1 and is coaxial with the front shell 1. The free end of the first connecting part 4 is provided with rounded corners on the outer side to facilitate the installation of the connecting pipe.

[0037] In a preferred embodiment of the present invention, the second connecting part 5 is integrally disposed on the outer side of the rear shell 2, and the second connecting part 5 is provided with a liquid outlet hole 7 inside. The liquid outlet hole 7 coincides with the central axis of the rear shell 2 and is connected through the guide groove. The free end of the second connecting part 5 is provided with a rounded corner on the outer circumference, and a cross-shaped limiting rib is provided adjacent to the liquid outlet hole 7.

[0038] Specifically, in this embodiment, the guide channel is connected to the liquid outlet 7 through a cross-shaped limiting rib.

[0039] In a preferred embodiment of this utility model, the central axes of the hemispherical plug, the umbrella part, and the guide positioning post coincide, and an movable gap is provided between the free end of the guide positioning post and the cross-shaped limiting rib.

[0040] Specifically, in this embodiment, the cross-shaped limiting ribs play the role of supporting the guide positioning column, which can limit the range of motion of the guide positioning column to ensure that the soft rubber valve core 3 has effective space for timely stopping and guiding.

[0041] In a preferred embodiment of this invention, the gap between the multiple guide ribs and the guide positioning post on one side is greater than 0.25mm.

[0042] Specifically, in this embodiment, the gap between the multiple guide ribs and the guide positioning post on one side is greater than 0.25 mm, which can ensure that the central axis of the soft rubber valve core 3 coincides with the liquid inlet hole on the front shell 1 and the liquid outlet hole on the rear shell 2, and always maintains the centered position. The gap between the guide positioning post and the side wall of the front and rear shells remains unchanged, thereby ensuring that the parameters remain unchanged when gas and liquid pass through, improving the life of the check valve, and greatly ensuring the stopping and guiding effect.

[0043] In a preferred embodiment of the present invention, the hemispherical plug 31 is located at the top of the umbrella part, the hemispherical plug 31 is provided corresponding to the liquid inlet hole, and the diameter of the hemispherical plug 31 is smaller than the diameter of the liquid inlet hole.

[0044] Specifically, in this embodiment, the diameter of the hemispherical plug 31 is smaller than the diameter of the liquid inlet hole, and the hemispherical plug 31 is embedded in the liquid inlet hole. This ensures that the liquid enters the accommodating cavity evenly and flows out through the liquid outlet hole. When backflow occurs, it ensures that the umbrella part 32 (the outer top of the umbrella) of the soft rubber valve core 3 closes with the horn-shaped assembly position to prevent backflow.

[0045] In a preferred embodiment of this utility model, the front shell 1 and the rear shell 2 are made of plastic material.

[0046] Specifically, in this embodiment, the outer side of the rear shell 2 is flush with the outer side of the front shell 1, and the front shell 1 and the rear shell 2 are fixed together by ultrasonic welding.

[0047] In a preferred embodiment of this invention, the soft rubber valve core 3 is made of flexible plastic material.

[0048] Specifically, in this embodiment, the soft rubber valve core 3 is made of silicone rubber.

[0049] Specifically, in this embodiment, the soft rubber valve core 3 is made of silicone rubber with a hardness range of 30 to 60 degrees. The specific specifications need to be determined according to the valve body specifications.

[0050] This utility model's one-way check valve is also suitable for pneumatic check valves in thinner pipelines, offering good reliability. Specifically, in this embodiment, when the valve body 1 is installed in the corresponding pipeline, the valve body 1 is in a closed state, meaning the umbrella part 32 of the soft rubber valve core 3 and the inner bottom end of the front shell 1 are interference-fitted along the trumpet-shaped assembly position, thus maintaining a closed state. When the liquid or gas in the inlet pipe reaches a certain pressure, the umbrella part 32 of the soft rubber valve core 3 is subjected to pressure, forming a gap between the side wall of the front shell 1 and the umbrella part 32 (the outer top of the umbrella). Liquid flows in through the gap and enters the receiving cavity through the guide groove, finally flowing out through the outlet hole on the rear shell, thus maintaining a conductive state. Conversely, when the liquid or gas in the outlet pipe reaches a certain pressure, the umbrella part 32 is subjected to pressure in the opposite direction, pushing the umbrella part 32 and the inner bottom end of the front shell 1 to form an interference-sealed connection along the trumpet-shaped assembly position, thus preventing liquid backflow and maintaining a check state.

[0051] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A one-way check valve, comprising a valve body, wherein the valve body is a cylindrical structure with connecting portions at both ends, characterized in that, The valve body includes a front shell, a rear shell, and a soft rubber valve core. The soft rubber valve core is an umbrella-shaped structure, comprising a hemispherical plug, an umbrella-shaped part, and a guide positioning post. The hemispherical plug and the guide positioning post are integrally disposed on both sides of the umbrella-shaped part. Both the front shell and the rear shell are cavity structures with openings at the front ends. The bottom of the front shell has a horn-shaped mounting position. The rear shell is semi-embedded inside the front shell. The soft rubber valve core is movably disposed within the accommodating cavity constructed by the front shell and the rear shell. The umbrella-shaped part is interference-fitted with the horn-shaped mounting position.

2. The one-way check valve according to claim 1, characterized in that, The interior of the front shell is a trumpet-shaped structure. The bottom of the interior of the front shell is provided with an annular limiting protrusion along the top circumference of the trumpet-shaped mounting position. The inner diameter of the annular limiting protrusion is larger than the outer diameter of the umbrella part. The trumpet-shaped mounting position matches the umbrella part.

3. The one-way check valve according to claim 2, characterized in that, The rear shell is a cavity structure with a stepped cross section. The outer side of the front end of the rear shell matches the inner side of the front shell. The front end of the rear shell is provided with multiple guide ribs vertically along the inner sidewall. The multiple guide ribs are symmetrically arranged. The multiple guide ribs are spaced apart from the guide positioning post. A flow channel is constructed between the multiple guide ribs. The bottom inner side of the rear shell is provided with a cross-shaped limiting rib.

4. The one-way check valve according to claim 3, characterized in that, The connecting part includes a first connecting part and a second connecting part. The first connecting part is integrally disposed on the outer side of the front shell. The interior of the first connecting part is provided with a liquid inlet hole, which is connected through the front shell. The liquid inlet hole coincides with the central axis of the front shell. The free end of the first connecting part is provided with a rounded corner on the outer circumferential direction.

5. The one-way check valve according to claim 4, characterized in that, The second connecting part is integrally disposed on the outer side of the rear shell. The second connecting part has a liquid outlet hole inside. The liquid outlet hole coincides with the central axis of the rear shell. The liquid outlet hole is connected through the guide groove. The free end of the second connecting part has a rounded corner on the outer circumference. The cross-shaped limiting rib is disposed adjacent to the liquid outlet hole.

6. The one-way check valve according to claim 5, characterized in that, The central axes of the hemispherical plug, umbrella, and guide positioning post coincide, and there is an movable gap between the free end of the guide positioning post and the cross-shaped limiting rib.

7. The one-way check valve according to claim 6, characterized in that, The gap between one side of the multiple guide ribs and the guide positioning post is greater than 0.25mm.

8. The one-way check valve according to claim 7, characterized in that, The hemispherical plug is located at the top of the umbrella part, and the hemispherical plug is provided corresponding to the liquid inlet hole. The diameter of the hemispherical plug is smaller than the diameter of the liquid inlet hole.

9. The one-way check valve according to claim 1, characterized in that, The front and rear shells are made of plastic material.

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