Spring-type check valve

Abstract

The utility model discloses a spring type check valve, including valve body, the valve body is the circular cavity structure of being equipped with the connecting portion at both ends, the inside of valve body is equipped with valve core, sealing washer, and the valve body includes upper shell, lower shell, and the upper shell is the cavity structure of being equipped with the opening of front end, and the inside bottom of upper shell is equipped with the smooth surface of flaring, and the lower shell is embedded and is arranged in the mouth portion of upper shell, and the valve core is arranged in the accommodation cavity of upper shell, lower shell construction, and the guide position post is located at the both ends of spring respectively, and the top of guide position post is provided with the arc surface, and the sealing washer is covered and is arranged in the front end of guide position post, and the guide position post is abutted with upper shell through spring, and is sealedly connected with upper shell through sealing washer. The utility model has the advantages of less components, simple assembly, small size, and is suitable for fine diameter pipeline system, adopts plastic and other corrosion -resistant materials, is suitable for various liquid medicine, gas medium, especially satisfies the health requirement of medical industry. The utility model has the advantages of simple structure, small size, strong corrosion resistance, reliable sealing, long life and low cost.

Description

Technical Field

[0001] This utility model relates to the field of fluid control element technology, and in particular to a spring-loaded one-way valve. Background Technology

[0002] A check valve is an automatic valve that opens and closes based on the pressure difference between its inlet and outlet. It is widely used in hydraulic or pneumatic systems to prevent the reverse flow of oil or gas.

[0003] In rehabilitation equipment and medical devices (such as infusion pumps, ventilators, and pneumatic compression therapy devices), the performance of one-way valves is crucial. If a one-way valve fails, becomes blocked, or does not seal properly, it may lead to abnormal equipment operation, reduced treatment effectiveness, or even safety accidents. Frequent replacement of failed valves, on the other hand, increases operating costs.

[0004] Currently, the main types of check valves on the market are as follows: Ball-type check valves open and close using a steel ball under differential pressure. Their disadvantages are that under high pressure or frequent operation, the steel ball can easily clog the outlet orifice, leading to abnormal closure. Furthermore, after miniaturization, the flow rate is difficult to guarantee. Additionally, the steel ball and matching spring are prone to rust and oxidation, and the spring's elasticity weakens after long-term use, resulting in decreased sealing performance. Diaphragm-type check valves, although lower in cost and smaller in size, are prone to diaphragm misalignment or incomplete return, leading to sealing failure. Moreover, their operating pressure range is narrow, limiting their applicability.

[0005] Therefore, there is an urgent need in this field for a spring-loaded check valve that is small in size, simple in structure, highly reliable, has a long service life, low in production cost, and is corrosion-resistant, in order to meet the increasingly demanding technical requirements of modern medical and rehabilitation equipment.

[0006] Therefore, there is an urgent need for engineers in this field to develop a one-way check valve that is small in size, simple in structure, easier to use, more reliable, has a long service life, and low in production cost to meet the current needs of rehabilitation equipment and medical devices. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a spring-loaded check valve that is small in size, simple in structure, highly reliable, has a long service life, low in production cost, and is corrosion resistant.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0009] A spring-type check valve, comprising: a valve body, wherein the valve body is a circular cavity structure with connecting portions provided at both ends, a valve core and a sealing ring are arranged inside the valve body, the valve body comprises an upper shell and a lower shell, the upper shell is a cavity structure with an opening provided at a front end, a horn-shaped smooth surface is provided at an inner bottom of the upper shell, the lower shell is embedded and arranged at an opening of the upper shell, the valve core is movably arranged in an accommodation cavity constructed by the upper shell and the lower shell, the valve core comprises a guide post and a spring, the guide post and the lower shell are respectively located at two ends of the spring, an arc-shaped surface is convexly provided at a top of the guide post, the sealing ring is sleeved at a front end of the guide post, the guide post is abutted against the upper shell via the spring, and is in sealing connection with the upper shell via the sealing ring.

[0010] In the above structure, the guide post is a circular structural body with a convex-shaped cross section, the guide post comprises a plunger portion and a limit portion, the limit portion is located at a bottom of the plunger portion, the arc-shaped surface is located at a top end of the plunger portion, and the plunger portion and the limit portion are coaxially arranged.

[0011] In the above structure, the connecting portions comprise a first connecting portion and a second connecting portion, the first connecting portion is integrally arranged with the upper shell, a liquid inlet hole is arranged in the first connecting portion and penetrates through the upper shell, a diameter of the liquid inlet hole is smaller than a diameter of the plunger portion, the second connecting portion is integrally arranged with the lower shell, a liquid outlet hole is arranged in the second connecting portion and penetrates through the lower shell, and tapered undercuts are provided at free ends of both the first connecting portion and the second connecting portion.

[0012] In the above structure, the guide post and the spring are located inside the lower shell, the guide post, the spring and the lower shell are coaxially arranged, the guide post, the spring and the lower shell are integrally formed, and the guide post, the spring and the lower shell are all made of plastic materials.

[0013] In the above structure, the spring comprises a first end and a second end, the guide post is movably arranged at the first end of the spring, the second end of the spring is embedded and arranged in a clamping groove inside the lower shell, the spring is separately arranged from the guide post and the lower shell, and the spring is fixedly connected to the guide post and the lower shell respectively.

[0014] In the above structure, the spring is matched with the accommodation cavity inside the upper shell, an opening of the upper shell is provided with a first ultrasonic surface for ultrasonic welding with the lower shell.

[0015] In the above structure, a limit boss and a second ultrasonic surface are respectively provided inside the lower shell, the limit boss is convexly arranged at a middle position inside the upper shell, the limit boss is matched with the spring, the second ultrasonic surface is matched with the first ultrasonic surface, and the upper shell and the lower shell are connected via ultrasonic welding.

[0016] In the above structure, the sealing ring is an elastic sealing ring, which is sleeved on the front end of the guide post and forms a sealing fit with the trumpet-shaped surface of the upper shell.

[0017] In the above structure, the guide post, spring, upper shell, lower shell, and sealing ring are all made of corrosion-resistant materials.

[0018] The beneficial effects of this utility model are as follows:

[0019] This invention features a split upper and lower shell design and an integrated valve core structure, resulting in fewer components, easier assembly, and a compact overall size. It is suitable for small-diameter piping systems. The arc-shaped surface at the top of the guide post mates with the flared surface, and a soft seal is achieved by a sealing ring, ensuring excellent sealing performance. The movement of the spring and guide post is precisely guided by a limiting part, preventing uneven wear and significantly extending service life. This invention has a simplified structure, making it suitable for injection molding and automated assembly, effectively reducing manufacturing costs. The main components are made of corrosion-resistant materials such as plastics, making it suitable for various liquid and gaseous media, especially meeting the hygiene requirements of the medical industry. This invention boasts a simple structure, small size, strong corrosion resistance, reliable sealing, long service life, and low production cost. Attached Figure Description

[0020] Figure 1 This is a front view of an embodiment of the spring-loaded check valve of this utility model;

[0021] Figure 2 This is a cross-sectional view of an embodiment of the spring-loaded check valve of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of an embodiment of the spring-loaded check valve of this utility model;

[0023] Figure 4 This is a schematic diagram of the internal structure of an embodiment of the spring-loaded check valve of this utility model;

[0024] Figure 5 This is an exploded view of the structure of an embodiment of the spring-loaded check valve of this utility model;

[0025] Figure 6 This is an exploded view of the second embodiment of the spring-loaded one-way valve of this utility model.

[0026] In the figure, 1-upper shell, 2-lower shell, 3-sealing ring, 4-guide post, 41-plunger part, 42-limiting part, 5-spring, 6-liquid inlet hole, 7-liquid outlet hole. Detailed Implementation

[0027] The specific embodiments of the present utility model will be further described below with reference to the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present utility model, but do not constitute a limitation on the present utility model. In addition, in the various embodiments of the present utility model described below, the technical features involved can be combined with each other as long as they do not conflict with each other.

[0028] As Figure 1-6 shown in the figure, a spring type check valve comprises: a valve body, the valve body is a circular cavity structure with connecting portions provided at both ends, a valve core and a sealing ring 3 are arranged inside the valve body, the valve body comprises an upper shell 1 and a lower shell 2, the upper shell 1 is a cavity structure with an opening provided at the front end, the inner bottom of the upper shell 1 is provided with a bell-shaped smooth surface, the lower shell 2 is embedded and arranged at the mouth of the upper shell 1, the valve core is movably arranged in an accommodation cavity formed by the upper shell 1 and the lower shell 2, the valve core comprises a guide post 4 and a spring 5, the guide post 4 and the lower shell 2 are respectively located at two ends of the spring 5, the top of the guide post 4 is convexly provided with an arc-shaped surface, the sealing ring 3 is sleeved at the front end of the guide post 4, the guide post 4 is abutted against the upper shell 1 through the spring 5, and is in sealing connection with the upper shell 1 through the sealing ring 3.

[0029] Specifically, in this embodiment, the guide post 4 is an integrated plastic part with a "convex" cross-section, comprising a plunger portion 41 at the top and a limiting portion 42 at the bottom, and the top end of the plunger portion 41 is an arc-shaped surface. The sealing ring 3 is sleeved at the front end of the plunger portion 41. A first end of the spring 5 is connected with the bottom of the guide post 4, and a second end is embedded in a clamping groove inside the lower shell 2, so that the spring 5 is always in a pre-compressed state, pushing the guide post 4 and the sealing ring 3 thereon to press against the bell-shaped surface of the upper shell 1 to form a seal. At this time, the valve is in a closed state, one end of the upper shell 1 is provided with a first connecting portion, and a liquid inlet hole 6 is opened inside the first connecting portion. One end of the lower shell 2 is provided with a second connecting portion, and a liquid outlet hole 7 is opened inside the second connecting portion, free ends of the first connecting portion and the second connecting portion are both provided with tapered undercuts, which are used for rapid plug connection with external pipelines and prevent falling out.

[0030] In a preferred embodiment of the present utility model, the guide post 4 is a circular structure with a "convex" cross-section, the guide post 4 comprises a plunger portion 41 and a limiting portion 42, the limiting portion 42 is located at the bottom of the plunger portion 41, the arc-shaped surface is located at the top end of the plunger portion 41, and the plunger portion 41 and the limiting portion 42 are arranged coaxially.

[0031] Specifically, in this embodiment, the "convex" structure of the guide post 4 ensures stable guidance during its movement and prevents deflection.

[0032] In a preferred embodiment of the present invention, the connecting part includes a first connecting part and a second connecting part. The first connecting part is integrally formed with the upper shell 1. The interior of the first connecting part penetrates the upper shell 1 and is provided with a liquid inlet hole 6. The diameter of the liquid inlet hole 6 is smaller than the diameter of the plunger part 41. The second connecting part is integrally formed with the lower shell 2. The interior of the second connecting part penetrates the lower shell 2 and is provided with a liquid outlet hole 7. The free ends of both the first connecting part and the second connecting part are provided with tapered undercuts.

[0033] Specifically, in this embodiment, the limiting part 42 cooperates with the limiting boss in the lower shell 2 to limit the maximum stroke of the guide post 4 and avoid excessive compression of the spring 5; the free ends of the two connecting parts are provided with tapered buckles to facilitate quick and secure connection with pipelines. The tapered buckles are used to quickly connect with external pipelines and prevent them from coming out.

[0034] In a preferred embodiment of this utility model, the guide post 4 and the spring 5 are located inside the lower shell 2. The guide post 4, the spring 5, and the lower shell 1 are coaxially arranged. The guide post 4, the spring 5, and the lower shell 2 are integrally formed. The guide post 4, the spring 5, and the lower shell 2 are all made of plastic material.

[0035] Specifically, in this embodiment, the guide post 4, spring 5, upper shell 1, and lower shell 2 can all be integrally molded using medical-grade corrosion-resistant plastics such as PPSU, PP, and POM through injection molding. The spring 5 can also be a corrosion-resistant metal spring or a plastic spring. This material and process selection ensures the long-term stable operation of the valve in harsh media environments. The guide post 4, spring 5, upper shell 1, and lower shell 2, made of corrosion-resistant materials such as plastics, are suitable for various liquid and gas media, especially meeting the hygiene requirements of the medical industry.

[0036] Specifically, in this embodiment, the guide post 4, spring 5, and lower shell 2 are coaxially arranged and can be integrally molded. They are all made of corrosion-resistant materials such as plastic, which improves the integrity of the valve body and its resistance to media corrosion. The integral molding of the guide post 4, spring 5, and lower shell 2 results in low production costs, a simplified structure, and suitability for injection molding and automated assembly, effectively reducing manufacturing costs.

[0037] In the second embodiment of this utility model, the spring 5 includes a first end and a second end. The guide post 4 is movably disposed at the first end of the spring 5, and the second end of the spring 5 is embedded in a slot inside the lower shell 2. The spring 5, the guide post 4, and the lower shell 2 are separately disposed, and the spring 5 is fixedly connected to the guide post 4 and the lower shell 1 respectively.

[0038] Specifically, in the second embodiment of this utility model, the spring 5 is separately set from the guide post 4 and the lower shell 2. The spring 5 is fixedly connected to the guide post 4 and the lower shell 1 respectively. The specific method can be adopted according to production needs. The difference in effect and service life between the separate type and the integrated type is not significant.

[0039] In a preferred embodiment of this utility model, the spring 5 is matched with the accommodating cavity inside the upper shell 1, and the opening of the upper shell 2 is provided with a first ultrasonic surface for ultrasonic welding with the lower shell 2.

[0040] Specifically, in this embodiment, the upper shell 1 has a first ultrasonic surface at its opening, and the lower shell 2 has a second ultrasonic surface at the corresponding position. The two are connected by ultrasonic welding, which provides good sealing and high assembly efficiency.

[0041] In a preferred embodiment of this utility model, the inner side of the lower shell 2 is provided with a limiting boss and a second ultrasonic surface. The limiting boss protrudes from the middle position inside the upper shell 1 and matches the spring 5. The second ultrasonic surface matches the first ultrasonic surface. The upper shell 1 and the lower shell 2 are connected by ultrasonic welding.

[0042] In a preferred embodiment of this utility model, the sealing ring 3 is an elastic sealing ring, which is sleeved on the front end of the guide post 4 and forms a sealing fit with the trumpet-shaped surface of the upper shell 1.

[0043] Specifically, in this embodiment, the arc-shaped surface at the top of the guide post 4 matches the surface of the flared mouth, and a soft seal is achieved by the sealing ring 3, resulting in a good sealing effect. The movement of the spring 5 and the guide post 4 is precisely guided by the limiting part, avoiding uneven wear and extending the service life.

[0044] In a preferred embodiment of this utility model, the guide post 4, spring 5, upper shell 1, lower shell 2, and sealing ring 3 are all made of corrosion-resistant materials.

[0045] Specifically, in this embodiment, the valve body is a cylindrical structure with an outer diameter of no more than 10mm, suitable for small-diameter pipeline systems; the one-way valve is suitable for unidirectional flow control of liquids or gases in medical equipment or rehabilitation equipment. This utility model has a simple structure, small size, corrosion resistance, and long service life, and is suitable for small pipeline systems in medical and rehabilitation equipment, with good sealing performance and reliability.

[0046] The working principle of this novel invention:

[0047] Closed state: When the pressure at the inlet end (first connection part) is less than or equal to the pressure at the outlet end (second connection part), under the preload of spring 5, the sealing ring 3 at the top of the guide post 4 is pressed tightly against the trumpet-shaped surface, cutting off the flow channel. Open state: When the pressure at the inlet end is large enough to overcome the preload of spring 5, the fluid pressure pushes the guide post 4 to compress the spring 5 and move backward. The sealing ring 3 disengages from the trumpet-shaped surface, forming an annular flow channel. The fluid passes sequentially through the inlet hole 6, the upper shell 1 accommodating cavity, the gap between the guide post 4 and the inner wall of the valve body 1, and the lower shell 2 accommodating cavity, finally flowing out from the outlet hole 7.

[0048] 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.

[0049] 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.

[0050] 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 spring-loaded check valve, comprising: A valve body, wherein the valve body is of a circular cavity structure with connecting portions arranged at two ends, and a valve core and a sealing ring are arranged inside the valve body, characterized in that the valve body comprises an upper shell and a lower shell, the upper shell is of a cavity structure with an opening arranged at a front end, a flared smooth surface is arranged at the inner bottom of the upper shell, the lower shell is embedded in an opening of the upper shell, the valve core is movably arranged in an accommodation cavity formed by the upper shell and the lower shell, the valve core comprises a guide post and a spring, the guide post and the lower shell are respectively located at two ends of the spring, an arc-shaped surface is convexly arranged at the top of the guide post, the sealing ring is sleeved at a front end of the guide post, the guide post is abutted against the upper shell through the spring, and is in sealing connection with the upper shell through the sealing ring.

2. The spring-loaded check valve according to claim 1, characterized in that, The guide post is a circular structural body with a convex-shaped cross section, the guide post comprises a plunger portion and a limiting portion, the limiting portion is located at a bottom of the plunger portion, the arc-shaped surface is located at a top end of the plunger portion, and the plunger portion and the limiting portion are coaxially arranged.

3. The spring-loaded check valve according to claim 2, characterized in that, The connecting portions comprise a first connecting portion and a second connecting portion, the first connecting portion is integrally arranged with the upper shell, a liquid inlet hole penetrates through the upper shell inside the first connecting portion, a diameter of the liquid inlet hole is smaller than a diameter of the plunger portion, the second connecting portion is integrally arranged with the lower shell, a liquid outlet hole penetrates through the lower shell inside the second connecting portion, and tapered undercuts are arranged at free ends of both the first connecting portion and the second connecting portion.

4. The spring-loaded check valve according to claim 3, characterized in that, The guide post and the spring are located inside the lower shell, the guide post, the spring and the lower shell are coaxially arranged, the guide post, the spring and the lower shell are integrally formed, and the guide post, the spring and the lower shell are all made of plastic materials.

5. The spring-loaded check valve according to claim 3, characterized in that, The spring comprises a first end and a second end, the guide post is movably arranged at the first end of the spring, the second end of the spring is embedded in a clamping groove inside the lower shell, the spring is separately arranged from the guide post and the lower shell, and the spring is fixedly connected with the guide post and the lower shell respectively.

6. The spring-loaded check valve according to claim 2, characterized in that, The spring is matched with the accommodation cavity inside the upper shell, and a first ultrasonic surface is arranged at the opening of the upper shell for ultrasonic welding with the lower shell.

7. The spring-loaded check valve according to claim 6, characterized in that, A limiting boss and a second ultrasonic surface are respectively arranged inside the lower shell, the limiting boss is convexly arranged at a middle position inside the upper shell, the limiting boss is matched with the spring, the second ultrasonic surface is matched with the first ultrasonic surface, and the upper shell and the lower shell are connected through ultrasonic welding.

8. The spring-loaded check valve according to claim 2, characterized in that, The sealing ring is an elastic sealing ring, the sealing ring is sleeved at the front end of the guide post, and forms a sealing fit with the flared surface of the upper shell.

9. The spring-loaded check valve according to claim 1, characterized in that, The guide post, the spring, the upper shell, the lower shell and the sealing ring are all made of corrosion-resistant materials.

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