A type of anti-detachment and anti-splash double-screw three-way valve
By designing a double-screw three-way valve, and utilizing the embedded fit of the sealing sleeve and O-ring, as well as the mechanical positioning of the limiting frame, the problems of easy loosening, falling off, and leakage in existing three-way valves are solved, achieving a stable connection and multi-stage sealing effect under high pressure or vibration environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 晋江市医院(上海市第六人民医院福建医院)
- Filing Date
- 2025-09-11
- Publication Date
- 2026-06-30
AI Technical Summary
When connecting a syringe, the existing three-way valve relies on a single threaded connection, which is prone to wear and loosening. Under high pressure or vibration, it is easy to fall off and leak. Traditional threaded seals do not have multi-level protection and are difficult to cope with the high risk of seal failure caused by temperature and pressure changes.
The design employs a double-threaded joint, where the external and internal threads of the sealing sleeve mesh together, and the O-ring and sealing ring groove are embedded together. Combined with the limiting frame and spring-driven compression ring mechanism, a multi-level sealing barrier is formed to ensure a stable connection and prevent leakage.
It effectively prevents loose connections and leaks, ensures stable connections under high pressure or vibration environments, reduces the risk of contamination, and improves safety and reliability in use.
Smart Images
Figure CN224433692U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of three-way valve technology, specifically relating to a double-screw three-way valve that is anti-detachment and anti-splash. Background Technology
[0002] A three-way valve is a valve device with three fluid channels, widely used in medical infusion, laboratory fluid control, and other fields. It controls the switching and distribution of fluid between the three channels by regulating the valve. Its core structure typically includes the main valve body, regulating mechanism, and connection port. Operators can change the fluid flow direction by rotating the regulating valve to achieve diversion, merging, or shut-off functions. In medical settings, three-way valves are often used as key components connecting syringes, infusion tubing, and injection needles.
[0003] In existing three-way valves, when connected to a syringe, the fixation typically relies solely on a threaded connection, with the sealing performance depending mainly on the tightness of the thread engagement. However, this single-threaded connection structure has significant drawbacks: after prolonged use or frequent disassembly and assembly, the threads are prone to wear and loosening, especially under high-pressure fluid impact or vibration environments, leading to potential detachment or leakage at the pipe connection; furthermore, traditional threaded seals lack multi-stage protection mechanisms, and simple sealing through thread gaps is insufficient to cope with temperature changes or fluid pressure fluctuations, increasing the risk of seal failure. Therefore, the applicant proposes a dual-threaded three-way valve with anti-detachment and anti-splash features to address the aforementioned problems. Utility Model Content
[0004] The purpose of this utility model is to provide a double-threaded three-way valve that is anti-detachment and anti-splash, in order to solve the problems in the prior art where the existing three-way valves for connecting syringes rely on a single thread for connection, which is prone to wear and loosening after long-term use, and the pipeline is prone to detachment and leakage under high pressure or vibration. In addition, the traditional threaded seals do not have multi-level protection and are difficult to cope with the high risk of failure caused by temperature and pressure changes.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A double-screw three-way valve with anti-detachment and anti-splash features includes: a three-way valve body, a regulating valve at the top of the three-way valve body, and an indicator arrow on one side of the top of the regulating valve;
[0007] An injection needle connecting tube is provided on one side of the exterior of the three-way valve body, and syringe connecting tubes are provided on the other two sides of the exterior of the three-way valve body.
[0008] Two protrusions are symmetrically fixedly installed on the outer side of the syringe connecting tube away from the three-way valve body, and a sealing ring gasket is fixedly installed on the outer middle of the syringe connecting tube.
[0009] Each of the two syringe connecting tubes has a fixing mechanism at the end away from the three-way valve body. A screw-type syringe is provided on one side of the three-way valve body. Two sealing ring grooves are formed on the inner wall of the end of the screw-type syringe near the syringe connecting tube. An internal thread is formed on the inner wall of the two sealing ring grooves on one side and at the adjacent end of the screw-type syringe.
[0010] Furthermore, the fixing mechanism includes a sealing sleeve disposed outside the syringe connecting tube. Two O-rings adapted to the sealing ring groove are fixedly installed on one end of the sealing sleeve, and an external thread adapted to the internal thread is fixedly installed on the other end of the sealing sleeve.
[0011] Furthermore, a limiting frame is fixedly installed on the inner wall of the sealing sleeve near the syringe connecting tube. The inner ring wall of the limiting frame has two symmetrically formed grooves, and the two grooves are adapted to the protrusions.
[0012] Furthermore, a fixing ring is fixedly installed in the middle of the inner wall of the sealing sleeve, and a squeezing ring is provided on the side of the fixing ring near the syringe connecting tube. Two telescopic rods are symmetrically arranged between the fixing ring and the squeezing ring, and both ends of the two telescopic rods are fixedly installed on the adjacent side wall surfaces of the fixing ring and the squeezing ring.
[0013] Furthermore, springs are fitted around the outside of both telescopic rods, and the two ends of the springs are fixedly connected to the adjacent sidewall surfaces of the fixing ring and the compression ring, respectively.
[0014] Furthermore, a protective cap is fitted onto the end of the injection needle connecting tube that is away from the three-way valve body.
[0015] Compared with the prior art, the advantages of the anti-detachment and anti-splash double-screw three-way valve provided by this utility model are:
[0016] (1) The external thread at one end of the sealing sleeve and the internal thread on the inner wall of the screw-type syringe form a tight engagement, effectively resisting fluid pressure or external force pulling and preventing loosening of the connection; the O-ring at the other end and the sealing ring groove on the inner wall of the screw-type syringe are embedded and cooperate to form a double sealing barrier, which can prevent leakage even in high vibration or high pressure environments; the limiting frame on the inner wall of the sealing sleeve is precisely matched with the protrusion at the end of the syringe connecting tube through the groove, and with the spring-driven compression ring elastic reset mechanism, automatic positioning and locking are achieved during connection, simplifying the operation process. Mechanical limiting prevents rotational loosening and ensures a stable and reliable connection. The additional blocking effect of the sealing ring gasket further seals the gap, forming a multi-level sealing system, which greatly improves the anti-detachment and anti-splashing capabilities.
[0017] (2) The indicator arrow at the top of the regulating valve intuitively displays the fluid flow direction. Operators can quickly switch paths by rotating the regulating valve to reduce the risk of misoperation. The cap at the end of the injection needle connecting tube covers the connection port by thread locking when not connected, which avoids both contamination and physical damage. It can also enhance structural stability when connected. The overall structure takes into account anti-detachment, anti-leakage and ease of operation. It is suitable for fields with stringent reliability requirements such as medical infusion and laboratory fluid control. Especially in scenarios that require frequent adjustments or vibration environments, its anti-splash and anti-detachment characteristics can significantly reduce the risk of contamination and ensure safe use. Attached Figure Description
[0018] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;
[0019] Figure 2 This is a schematic diagram of the screw-type syringe structure provided in an embodiment of the present utility model;
[0020] Figure 3 This is a schematic diagram of the sealing sleeve structure provided in an embodiment of the present utility model;
[0021] Figure 4 A schematic diagram of the extrusion ring structure provided in an embodiment of this utility model;
[0022] Explanation of reference numerals in the attached figures:
[0023] 1. Fixing mechanism; 101. Sealing sleeve; 102. O-ring; 103. External thread; 104. Limiting frame; 105. Fixing ring; 106. Telescopic rod; 107. Spring; 108. Compression ring; 2. Three-way valve body; 3. Adjusting valve; 4. Indicating arrow; 5. Injection needle connecting tube; 6. Protective cap; 7. Screw-type syringe; 8. Internal thread; 9. Sealing ring groove; 10. Syringe connecting tube; 11. Sealing ring gasket; 12. Protrusion. Detailed Implementation
[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.
[0025] As attached Figure 1 To be continued Figure 4 As shown:
[0026] Example 1:
[0027] This utility model provides a double-screw three-way valve that is anti-detachment and anti-splash, including a three-way valve body 2, a regulating valve 3 is provided at the top of the three-way valve body 2, and an indicator arrow 4 is provided on one side of the top of the regulating valve 3;
[0028] A needle connection tube 5 is provided on one side of the exterior of the three-way valve body 2, and syringe connection tubes 10 are provided on the other two sides of the exterior of the three-way valve body 2.
[0029] Two protrusions 12 are symmetrically fixedly installed on the outer side of the syringe connecting tube 10 away from the three-way valve body 2, and a sealing ring gasket 11 is fixedly installed on the outer middle of the syringe connecting tube 10.
[0030] Two syringe connecting tubes 10 are respectively provided with a fixing mechanism 1 at the end away from the three-way valve body 2. A screw-type syringe 7 is provided on one side of the three-way valve body 2. Two sealing ring grooves 9 are opened on the inner wall of the end of the screw-type syringe 7 near the syringe connecting tube 10. An internal thread 8 is opened on the inner wall of the two sealing ring grooves 9 on one side and at the adjacent end of the screw-type syringe 7.
[0031] As can be seen from the above, the three-way valve body 2 has a central fluid channel inside. After the fluid enters from the top inlet, the flow direction is controlled by the regulating valve 3, and the fluid is diverted to the two outlets through the internal channel. The indicator arrow 4 at the top of the regulating valve 3 can intuitively display the current fluid flow direction. The operator can switch the fluid path by rotating the regulating valve 3. The O-ring 102 on the outside of one end of the sealing sleeve 101 and the sealing ring groove 9 on the inner wall of one end of the screw syringe 7 form an embedded fit. The internal thread 8 machined on the inner wall of the screw syringe 7 and the external thread 103 on the outside of the sealing sleeve 101 are tightly engaged to prevent the connection from loosening. The sealing ring gasket 11 installed in the middle of the outside of the syringe connecting tube 10 can effectively block and seal the connection between the sealing sleeve 101 and the syringe connecting tube 10. The end of the injection needle connecting tube 5 is equipped with a protective cap 6, which can cover the connection port when no equipment is connected to avoid contamination or physical damage. When connected, the protective cap 6 and the injection needle connecting tube 5 are locked by threads to enhance the overall structural stability.
[0032] The internal thread 8 connects to the external thread 103, enabling the connection between the screw-type syringe 7 and the sealing sleeve 101. This effectively resists fluid pressure or external force pulling, preventing the screw-type syringe 7 from accidentally falling off and ensuring safety in medical or industrial settings. The embedded fit between the sealing ring gasket 11 and the sealing ring groove 9 forms a multi-level sealing barrier, preventing fluid leakage and reducing the risk of contamination even under high pressure or vibration environments. The arrow marking on the regulating valve 3 simplifies the flow direction switching process. The cap 6 structure combines protection and fixation functions, improving overall efficiency. It is suitable for fields requiring high-reliability connections, such as medical infusion and laboratory fluid control, and is especially suitable for occasions with strict requirements for leak prevention and detachment prevention.
[0033] Example 2:
[0034] This embodiment is basically the same as the previous embodiment, except that the fixing mechanism 1 includes a sealing sleeve 101 disposed outside the syringe connecting tube 10. Two O-rings 102 adapted to the sealing ring groove 9 are fixedly installed on one end of the sealing sleeve 101, and an external thread 103 adapted to the internal thread 8 is fixedly installed on the other end of the sealing sleeve 101.
[0035] A limiting frame 104 is fixedly installed on the inner wall of the sealing sleeve 101 near the syringe connecting tube 10. The inner ring wall of the limiting frame 104 has two symmetrical grooves, and the two grooves are adapted to the protrusion 12.
[0036] A fixing ring 105 is fixedly installed in the middle of the inner wall of the sealing sleeve 101. A squeezing ring 108 is provided on the side of the fixing ring 105 near the syringe connecting tube 10. Two telescopic rods 106 are symmetrically arranged between the fixing ring 105 and the squeezing ring 108. Both ends of the two telescopic rods 106 are fixedly installed on the adjacent side wall surfaces of the fixing ring 105 and the squeezing ring 108.
[0037] Springs 107 are fitted around the outside of both telescopic rods 106, and the two ends of the springs 107 are fixedly connected to the adjacent side wall surfaces of the fixing ring 105 and the compression ring 108, respectively.
[0038] A protective cap 6 is fitted on the end of the injection needle connecting tube 5 that is away from the three-way valve body 2.
[0039] As can be seen from the above: the external thread 103 of one end of the sealing sleeve 101 is screwed tightly into the internal thread 8 of the screw-type syringe 7, and the O-ring 102 at the other end of the sealing sleeve 101 is embedded into the sealing ring groove 9 of the screw-type syringe 7, forming a double sealing structure of thread and ring groove. A telescopic rod 106 and a spring 107 are provided between the fixing ring 105 and the compression ring 108 on the inner wall of the sealing sleeve 101. When one end of the sealing sleeve 101 is inserted into the adjacent end of the syringe connecting tube 10, the two protrusions 12 are matched with the two grooves of the limiting frame 104, and then the sealing sleeve 101 is pushed to make the syringe connecting tube 100... The end of the connector 10 is pressed against the compression ring 108, which in turn compresses the spring 107 and the telescopic rod 106. Then, the sealing sleeve 101 is rotated and released. The spring 107 and the telescopic rod 106 elastically return and push the compression ring 108, which, together with the limiting frame 104, compresses the protrusion 12. This effectively fixes and seals the sealing sleeve 101 and the syringe connecting tube 10, and seals the gap with the sealing ring gasket 11 to ensure a tight seal. The anti-rotation design of the limiting frame 104 and the protrusion 12 prevents the connecting tube from loosening due to accidental contact or fluid impact, making it suitable for environments requiring frequent adjustments or vibration.
[0040] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A double-screw three-way valve with anti-detachment and anti-splash features, comprising a three-way valve body (2), characterized in that, The top of the three-way valve body (2) is provided with a regulating valve (3), and an indicator arrow (4) is provided on one side of the top of the regulating valve (3); An injection needle connecting tube (5) is provided on one side of the outside of the three-way valve body (2), and syringe connecting tubes (10) are provided on the other two sides of the outside of the three-way valve body (2). Two protrusions (12) are symmetrically fixedly installed on the outer side of the syringe connecting tube (10) away from the three-way valve body (2), and a sealing ring gasket (11) is fixedly installed in the middle of the outer side of the syringe connecting tube (10). Each of the two syringe connecting tubes (10) is provided with a fixing mechanism (1) at the end away from the three-way valve body (2). A screw-type syringe (7) is provided on one side of the three-way valve body (2). Two sealing ring grooves (9) are opened on the inner wall of the end of the screw-type syringe (7) close to the syringe connecting tube (10). An internal thread (8) is opened on the inner wall of the two sealing ring grooves (9) on one side and at the adjacent end of the screw-type syringe (7).
2. The anti-detachment and anti-splash double-screw three-way valve according to claim 1, characterized in that: The fixing mechanism (1) includes a sealing sleeve (101) disposed outside the syringe connecting tube (10). Two O-rings (102) adapted to the sealing ring groove (9) are fixedly installed on one end of the sealing sleeve (101), and an external thread (103) adapted to the internal thread (8) is fixedly installed on the other end of the sealing sleeve (101).
3. The anti-detachment and anti-splash double-screw three-way valve according to claim 2, characterized in that: A limiting frame (104) is fixedly installed on the inner wall of one end of the sealing sleeve (101) near the syringe connecting tube (10). The inner ring wall of the limiting frame (104) has two symmetrically opened grooves, and the two grooves are adapted to the protrusion (12).
4. The anti-detachment and anti-splash double-screw three-way valve according to claim 2, characterized in that: A fixing ring (105) is fixedly installed in the middle of the inner wall of the sealing sleeve (101). A squeezing ring (108) is provided on the side of the fixing ring (105) near the syringe connecting tube (10). Two telescopic rods (106) are symmetrically arranged between the fixing ring (105) and the squeezing ring (108). Both ends of the two telescopic rods (106) are fixedly installed on the adjacent side wall surfaces of the fixing ring (105) and the squeezing ring (108).
5. The anti-detachment and anti-splash double-screw three-way valve according to claim 4, characterized in that: Both of the telescopic rods (106) are fitted with springs (107), and the two ends of the springs (107) are fixedly connected to the adjacent sidewall surfaces of the fixing ring (105) and the compression ring (108), respectively.
6. The anti-detachment and anti-splash double-screw three-way valve according to claim 1, characterized in that: The end of the injection needle connecting tube (5) away from the three-way valve body (2) is covered with a protective cap (6).