Liquid path one-way valve

Abstract

A liquid path one-way valve comprises a first butt joint used for being connected with a first channel, the first butt joint is provided with a blocking part coaxially arranged with the first butt joint, and at least one liquid outlet communicated with the first channel is formed in the peripheral side of the blocking part; the second butt joint is used for being connected with the second channel, and the first butt joint and the second butt joint are in sealed butt joint to form a sealed cavity; the sealing gasket comprises an annular sealing part of the outer ring and a one-way sealing part of the inner ring, and the annular sealing part tightly abuts against the inner wall of the sealing cavity to block the first channel and the second channel; a liquid passing hole is formed in the axis of the one-way sealing part, the plugging part is used for covering and plugging the liquid passing hole, and an inner groove is formed in the side, close to the second butt joint, of the one-way sealing part so as to form a space where the sealing gasket generates elastic deviation. The whole sealing gasket is of an annular sealing structure, plugging of a 360-degree fixing structure is more stable, the liquid through hole is blocked through the plugging part, reverse liquid cannot flow back through the liquid through hole, and backflow prevention is more reliable.

Description

Technical Field

[0001] This application relates to the field of high-pressure injection technology for medical devices, specifically to a liquid circuit check valve. Background Technology

[0002] With increasing emphasis on health, imaging technology has become widely accepted and recognized, replacing outdated methods like surgery and laboratory tests. A syringe syringe, used in conjunction with a high-pressure injector, draws contrast agent into the syringe using the injector's mechanical and electrical control. This contrast agent is then injected into the affected area of ​​the patient, and the imaging scanning equipment forms a clear and stable image, allowing for accurate assessment of the patient's condition and guiding treatment.

[0003] During high-pressure injection, a check valve is required in the fluid circuit. A check valve is a fluid control device whose core function is to allow fluid to flow in one direction while preventing reverse flow. Existing check valves in fluid circuits consist of a simple silicone sheet or flexible material sheet blocking one side of the passage. When the liquid flows in the correct direction, the pressure forces open the sheet, causing it to deform and allowing the liquid to pass through smoothly. When the liquid flows in the reverse direction, the sheet blocks the passage, thus achieving a one-way function.

[0004] According to the above solution, the existing one-way valve is implemented by a disc, which is insufficient in terms of sealing reliability when preventing backflow in one direction. Utility Model Content

[0005] This application provides a hydraulic check valve to improve the sealing reliability of the check valve against backflow.

[0006] According to this application, one embodiment provides a liquid circuit check valve, comprising:

[0007] A first docking connector is used to connect to a first channel. The first docking connector has a sealing part arranged coaxially with the first channel. At least one liquid outlet communicating with the first channel is provided on the periphery of the sealing part.

[0008] A second mating joint is used to connect to a second channel, wherein the first mating joint is sealed to the first mating joint to form a sealed cavity; and

[0009] A sealing gasket comprising an annular sealing portion of an outer ring and a one-way sealing portion of an inner ring, the annular sealing portion being tightly pressed against the inner wall of the sealing cavity to block the first channel and the second channel;

[0010] The one-way sealing part has a liquid passage hole at its axial center, and the sealing part is used to cover and seal the liquid passage hole. The one-way sealing part is provided with an inner groove on the side near the second mating joint to form a space for the sealing gasket to generate elastic displacement.

[0011] In another embodiment, the first and second mating joints are respectively provided with annular mating portions and annular mating grooves for insertion of the annular mating portions on opposite sides, and the mating portions are inserted into the mating grooves to clamp and fix the annular sealing portions.

[0012] In another embodiment, the diameter of the sealing gasket is larger than the diameter of the sealing cavity, and the annular sealing portion is under radial compression.

[0013] In another embodiment, at least one raised sealing ring is provided on the end face of the annular sealing part, and the annular sealing part is under compression in the axial direction.

[0014] In another embodiment, the sealing part includes a protruding sealing post, the front end of which abuts against the periphery of the liquid passage hole, and the diameter of the front end face of the sealing part is larger than the diameter of the liquid passage hole, so as to completely cover the liquid passage path of the liquid passage hole.

[0015] In another embodiment, the front end face of the sealing column is recessed to form a liquid-blocking groove, and the projection of the liquid passage hole along the axis falls into the liquid-blocking groove.

[0016] In another embodiment, the inner wall of the plugging tank is set as an inclined surface, and the diameter of the opening of the plugging tank is larger than the diameter of the bottom of the tank.

[0017] In another embodiment, the inner ring of the one-way sealing part is configured as a liquid-passing platform that protrudes towards the inner groove and is recessed away from the inner groove, and the outer ring of the one-way sealing part is configured as a liquid-guiding platform that is recessed towards the inner groove and protrudes away from the inner groove.

[0018] In another embodiment, a plurality of the liquid outlets are arranged around the sealing portion and evenly distributed circumferentially.

[0019] In another embodiment, the end face of the liquid guide platform is evenly distributed with multiple anti-clogging points along the circumference, and the anti-clogging points are distributed outside the circle where the liquid outlet is located.

[0020] According to the liquid circuit check valve of the above embodiment, liquid enters the sealing cavity through the first channel and the outlet. Hydraulic pressure pushes the one-way sealing part to elastically shift towards the side closer to the second mating joint, thereby opening the gap between the sealing part and the liquid passage hole, so that liquid can enter the second channel through the liquid passage hole. If liquid enters the sealing cavity from the second channel, hydraulic pressure pushes the inner groove of the sealing part to press tightly against the sealing part, thereby squeezing the gap between the liquid passage hole and the sealing part and preventing liquid backflow, thus realizing the one-way liquid passage function of the check valve. When the liquid moves in the opposite direction, the gap on the periphery of the sealing cavity is blocked and sealed by the annular sealing part, and the liquid passage hole is further blocked and sealed under hydraulic pressure. The greater the hydraulic pressure, the better the sealing performance, thereby further improving the sealing reliability of the check valve against backflow. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the liquid circuit check valve in one embodiment;

[0022] Figure 2 This is an exploded structural diagram of a liquid circuit check valve in one embodiment;

[0023] Figure 3 This is an exploded structural diagram of the liquid circuit check valve from another perspective in one embodiment;

[0024] Figure 4 This is a cross-sectional view of the hydraulic circuit check valve in its assembled state in one embodiment;

[0025] Figure 5 This is a cross-sectional view of the liquid circuit check valve in an explosive state in one embodiment.

[0026] Figure label:

[0027] 1. First passage;

[0028] 2. First mating joint; 21. Sealing part; 211. Sealing column; 212. Liquid blocking tank; 22. Liquid outlet; 23. Mating part;

[0029] 3. Sealing gasket; 31. Annular sealing part; 311. Sealing ring; 32. One-way sealing part; 321. Inner groove; 322. Fluid passage hole; 323. Fluid passage platform; 324. Fluid guide platform; 33. Anti-clogging point;

[0030] 4. Second mating joint; 41. Mating groove;

[0031] 5. Second channel.

[0032] 6. Sealed cavity. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0034] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0035] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0036] During high-pressure injection, a check valve is required in the fluid circuit. A check valve is a fluid control device whose core function is to allow fluid to flow in one direction while preventing reverse flow. Existing check valves consist of a simple silicone or flexible material sheet blocking one side of the passage. When the fluid flows in the correct direction, the pressure forces open the sheet, allowing the fluid to pass through smoothly. Reverse flow occurs because the sheet blocks the passage, achieving a one-way function. However, existing check valves, implemented with a single disc, lack sufficient sealing reliability for preventing backflow in one direction.

[0037] This application provides a hydraulic check valve to improve the sealing reliability of the check valve against backflow.

[0038] Please refer to Figure 1 , Figure 2 , Figure 3 ,and Figure 4One embodiment provides a liquid circuit one-way valve, comprising: a first docking connector 2 for connecting to a first channel 1, the first docking connector 2 having a sealing portion 21 coaxially arranged therewith, and at least one liquid outlet 22 communicating with the first channel 1 on the periphery of the sealing portion 21; a second docking connector 4 for connecting to a second channel, the first docking connector 2 sealingly docking with the first docking connector 4 to form a sealed cavity; and a sealing gasket 3, comprising an annular sealing portion 31 of the outer ring and a one-way sealing portion 32 of the inner ring, the annular sealing portion 31 pressing tightly against the inner wall of the sealed cavity to block the first channel 1 and the second channel; a liquid passage hole 322 is provided on the axis of the one-way sealing portion 32, the sealing portion 21 is used to cover and block the liquid passage hole 322, and the side of the one-way sealing portion 32 near the second docking connector 4 is provided with an inner groove 321 to form a space for the sealing gasket 3 to generate elastic displacement.

[0039] In this embodiment, please refer to Figure 4 Liquid enters the sealing cavity through the first channel 1 and the outlet 22. Hydraulic pressure pushes the one-way sealing part 32 to elastically shift towards the side closer to the second mating joint 4, thereby opening the gap between the sealing part 21 and the liquid passage 322, allowing liquid to enter the second channel through the liquid passage 322. If liquid enters the sealing cavity through the second channel, hydraulic pressure pushes the inner groove 321 of the sealing part to press tightly against the sealing part 21, thereby squeezing the gap between the liquid passage 322 and the sealing part 21 and preventing liquid backflow, thus realizing the one-way liquid passage function of the one-way valve. When the liquid moves in the opposite direction, the gap on the periphery of the sealing cavity is blocked and sealed by the annular sealing part 31, and the liquid passage 322 is further blocked and sealed under hydraulic pressure. The greater the hydraulic pressure, the better the sealing performance, thereby further improving the sealing reliability of the one-way valve against backflow.

[0040] In this embodiment, please refer to Figure 2 , Figure 3 and Figure 4 The sealing gasket 3 is made of a single piece of silicone elastic material. The sealing gasket 3 is designed as a ring-shaped sealing structure. When sealing the outer periphery, it fits tightly and compacts against the inner walls of the sealing cavities on both sides. The 360-degree fixed structure makes the sealing of the silicone elastic structure more stable and the backflow prevention more reliable. Due to the presence of the inner groove 321, the one-way sealing part 32 of the silicone elastic material can elastically deform towards the second docking joint 4 under hydraulic pressure on the first docking joint 2 side. When there is no hydraulic pressure, it automatically resets and seals the liquid passage hole 322, realizing the function of liquid passage. The blocking of the liquid passage hole 322 is achieved by the structure of the sealing gasket 3 and the hydraulic cooperation. The hydraulic pressure on the second docking joint 4 side can only push the one-way sealing part 32 further to press against the sealing part 21, strengthening the sealing between the two.

[0041] In this embodiment, please refer to Figure 1The left side consists of the first docking connector 2 and the first channel 1, which is the liquid supply end of the entire liquid channel. The right side consists of the second docking connector 4 and the second channel, which is the receiving end of the entire liquid channel. Under the action of the one-way valve, the liquid can only enter the right channel from the left channel and cannot enter the left channel from the right channel.

[0042] For details, please refer to Figure 4 and Figure 5 The first docking joint 2 and the second docking joint 4 can only form a sealing cavity for installing the sealing gasket 3 to form a one-way valve when they are connected. The first docking joint 2 and the second docking joint 4 are respectively provided with an annular docking part 23 and an annular docking groove 41 for the annular docking part 23 to be inserted into. Specifically, in this embodiment, the docking part 23 is provided on the first docking joint 2, and the docking groove 41 is formed on the second docking joint 4. The docking part 23 is inserted into the docking groove 41 and fixed by threads, screws or other means to form a stable state to clamp and fix the annular sealing part 31.

[0043] Please refer to Figure 4 and Figure 5 The sealing gasket 3 is designed as an annular sealing structure. Specifically, the diameter of the sealing gasket 3 is larger than the diameter of the sealing cavity. The annular sealing part 31 is under radial compression, thereby enhancing the radial sealing performance of the sealing gasket 3. The axial thickness of the annular sealing part 31 is greater than the width of the outer periphery of the sealing cavity, so that the annular sealing part 31 is under axial compression, thereby enhancing the axial sealing performance of the sealing gasket 3.

[0044] For further details, please refer to... Figure 4 and Figure 5 At least one raised sealing ring 311 is provided on the end face of the annular sealing part 31. The sealing ring 311 can be provided on one side or both sides. The same side of the annular sealing part 31 can be provided with a single ring or multiple rings of different diameters to complicate the passage and further enhance the sealing performance of the sealing gasket 3 around the periphery. In this embodiment, one sealing ring 311 is provided and is provided on the side of the annular sealing part 31 near the second mating joint 4. The specific design can also be designed according to the specific usage environment.

[0045] Please refer to Figure 4 and Figure 5The inner ring of the one-way sealing part 32 is configured as a liquid-passing platform 323 that protrudes towards the inner groove 321 and is concave away from the inner groove 321. The outer ring of the one-way sealing part 32 is configured as a liquid-guiding platform 324 that is concave towards the inner groove 321 and protrudes away from the inner groove 321. When liquid enters the sealing cavity on the left side of the sealing gasket 3 from the outlet 22, the protruding liquid-guiding platform 324 and the concave liquid-passing platform 323 guide and concentrate the liquid at the position of the liquid-passing platform 323, close to the liquid passage 322. The concentrated hydraulic pressure opens the gap between the sealing part 21 and the liquid-passing platform 323, thereby forming a liquid channel. When the liquid input stops, the liquid remaining in the second channel remains in the sealing cavity on the right side of the sealing gasket 3, that is, in the inner groove 321. A certain amount of hydraulic pressure squeezes the liquid-passing platform 323 and the liquid-guiding platform 324 to further squeeze the sealing part 21, strengthening the seal.

[0046] Please refer to Figure 4 and Figure 5 The end face of the liquid guide platform 324 has multiple anti-blocking points 33 evenly distributed around the circumference, and the anti-blocking points 33 are distributed on the outer side of the circle where the liquid outlet 22 is located, which isolates the liquid outlet 22 and the sealing gasket 3, and prevents the liquid guide platform 324 from sticking to and blocking the liquid outlet 22.

[0047] Please refer to Figure 4 and Figure 5 The sealing portion 21 includes a protruding sealing post 211. The front end of the sealing post 211 (i.e., the end near the sealing gasket 3) abuts against the periphery of the liquid passage hole 322, and the diameter of the front end face of the sealing portion 21 is larger than the diameter of the liquid passage hole 322, so as to completely cover the liquid passage path of the liquid passage hole 322. In this embodiment, three liquid outlets 22 are provided, and the multiple liquid outlets 22 are evenly distributed around the sealing portion 21 in the circumferential direction.

[0048] For further details, please refer to... Figure 4 and Figure 5 The front end face of the sealing column 211 is recessed to form a liquid-blocking groove 212, and the projection of the liquid passage hole 322 along the axis falls into the liquid-blocking groove 212. The inner wall of the liquid-blocking groove 212 is set as an inclined surface, and the diameter of the groove opening is larger than the diameter of the bottom. The peripheral side of the sealing column 211 and the inner wall of the liquid-blocking groove 212 form a pressure ring at the front end of the sealing column 211. The liquid passage hole 322 is entirely under the pressure ring and the sealing ring 311 of the sealing gasket 3, which enhances the sealing performance of the liquid passage hole 322 and further improves the sealing reliability of the one-way valve against backflow.

[0049] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A liquid passage check valve characterized by comprising: The utility model relates to a sealing gasket for a first channel (1) and a second channel, comprising: a first docking joint (2) for connecting the first channel (1), the first docking joint (2) having a sealing part (21) coaxially arranged therewith, the sealing part (21) being provided with at least one liquid outlet (22) in communication with the first channel (1); a second docking joint (4) for connecting the second channel, the first docking joint (2) being sealingly docked with the second docking joint (2) to form a sealed cavity; and a sealing gasket (3) comprising an annular sealing part (31) of an outer ring and a one-way sealing part (32) of an inner ring, the annular sealing part (31) being tightly abutted against the inner wall of the sealed cavity to block the first channel (1) and the second channel, the shaft center of the one-way sealing part (32) being provided with a liquid passage hole (322), the sealing part (21) being used for covering and sealing the liquid passage hole (322), and the one-way sealing part (32) being provided with an inner groove (321) close to one side of the second docking joint (4) to form a space for the elastic deflection of the sealing gasket (3).

2. The liquid passage check valve according to claim 1, wherein The first docking joint (2) and the second docking joint (4) are respectively provided with an annular docking part (23) and an annular docking groove (41) for the insertion of the annular docking part (23) on the opposite side, the docking part (23) is inserted into the docking groove (41) to clamp and fix the annular sealing part (31).

3. The liquid passage check valve according to claim 2, wherein The diameter of the sealing gasket (3) is greater than the diameter of the sealed cavity, and the annular sealing part (31) is in a state of being squeezed in the radial direction.

4. The liquid passage check valve according to claim 2, wherein The annular sealing part (31) is provided with at least one protruding sealing ring (311) on the end face, and the annular sealing part (31) is in a state of being squeezed in the axial direction.

5. The liquid passage check valve according to claim 1, wherein The sealing part (21) comprises a protruding sealing column (211), the front end of the sealing column (211) is tightly abutted against the circumferential side of the liquid passage hole (322), and the diameter of the front end face of the sealing part (21) is greater than the diameter of the liquid passage hole (322) to completely cover the liquid passage path of the liquid passage hole (322).

6. The liquid passage check valve according to claim 5, wherein The front end face of the sealing column (211) is concave to form a liquid blocking groove (212), and the projection of the liquid passage hole (322) on the axis falls into the liquid blocking groove (212).

7. The liquid passage check valve according to claim 6, wherein The inner side wall of the liquid blocking groove (212) is provided as an inclined surface, and the diameter of the groove opening of the liquid blocking groove (212) is greater than the diameter of the groove bottom.

8. The liquid passage check valve according to claim 1, wherein The inner ring of the one-way sealing part (32) is provided as a liquid passage table (323) protruding toward one side of the inner groove (321) and recessed away from the other side of the inner groove (321), and the outer ring of the one-way sealing part (32) is provided as a liquid guide table (324) recessed toward one side of the inner groove (321) and protruding away from the other side of the inner groove (321).

9. The liquid passage check valve according to claim 8, wherein A plurality of liquid outlets (22) are uniformly distributed around the sealing part (21) in the circumferential direction.

10. The liquid passage check valve according to claim 8, wherein The end face of the liquid guide table (324) is uniformly provided with a plurality of anti-blocking points (33) in the circumferential direction, and the anti-blocking points (33) are distributed outside the circle where the liquid outlets (22) are located.

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