Quick plug connector with one-way valve

Abstract

The quick connector comprises a secondary pipe and a primary pipe, one end of the secondary pipe is fixedly and hermetically connected with one end of the primary pipe, a one-way valve structure is arranged at the joint of the secondary pipe and the primary pipe, the one-way valve structure comprises a spring and a movable valve element, and a fluid chamber and a front movable chamber are sequentially arranged in the secondary pipe; a rear movable chamber, a connecting chamber and a mounting chamber are sequentially arranged in the main pipe, the front movable chamber and the rear movable chamber are connected to form a movable chamber for the movable valve element to move, the connecting chamber is communicated with the rear movable chamber through a connecting port, and the diameter of the connecting port is smaller than that of the movable valve element. According to the one-way valve, the spring is matched with the movable valve element, the limiting pipe, the limiting rod and other components are combined, stable movement of the movable valve element is guaranteed, blocking is avoided, and long-term reliable work of the one-way valve is guaranteed. The quick-plug connector is compact and reasonable in overall structure and suitable for various working conditions, and the comprehensive performance and reliability of the quick-plug connector with the one-way valve are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of quick-connect fittings, and particularly relates to a quick-connect fitting with a check valve. Background Art

[0002] Due to its characteristics of quick connection and convenient disassembly, quick-connect fittings are widely used in various systems such as mechanical equipment, industrial pipelines, and automotive parts. During actual use, in order to prevent the reverse flow of fluids, quick-connect fittings with check valves have emerged. They can ensure the smooth flow of fluids in a specific direction, avoiding problems such as equipment failures, medium contamination, or system pressure imbalance caused by fluid backflow.

[0003] However, the existing quick-connect fittings with check valves have many deficiencies in terms of structural design and performance. In the check valve structure of some fittings, the moving parts are prone to jamming during frequent opening and closing, resulting in the failure of the check valve and being unable to effectively prevent the reverse flow of fluids. Moreover, the sealing performance of the moving parts is not good, and leakage is likely to occur after long-term use, affecting the normal operation of the system. In addition, the installation and disassembly processes of some quick-connect fittings are relatively complex, which not only increases the operation difficulty but also reduces the work efficiency. Their sealing structure design is unreasonable, and it is difficult to ensure the sealing effect under harsh environments such as high pressure or high temperature, posing safety hazards. At the same time, the internal structure of the existing quick-connect fittings has a relatively large resistance when fluids pass through, affecting the fluid transmission efficiency, and the structural stability is insufficient, making it difficult to meet the usage requirements of different working conditions. Summary of the Invention

[0004] To solve the above technical problems, the technical solution adopted by the present invention is: a quick-connect fitting with a check valve, including a sub-tube and a mother tube. One end of the sub-tube is fixedly and sealingly connected to one end of the mother tube. A check valve structure is provided at the connection between the sub-tube and the mother tube. The check valve structure includes a spring and a movable valve core. Inside the sub-tube, there are successively a fluid chamber and a front activity chamber. Inside the mother tube, there are successively a rear activity chamber, a connection chamber, and an installation chamber. The front activity chamber and the rear activity chamber are connected to form an activity chamber for the movement of the movable valve core. The connection chamber is communicated with the rear activity chamber through a connection port, and the diameter of the connection port is smaller than the diameter of the movable valve core.

[0005] As a preference of the above technical solution, a limiting tube is fixedly connected to one side of the movable valve core. There are several side openings around the limiting tube. One end of the spring extends into the limiting tube, and one end of the spring is sleeved on several limiting rods. The limiting rods are fixedly connected to the sub-tube, and the limiting rods are evenly spaced and fixedly connected to each other adjacent.

[0006] As a preference of the above technical solution, a sealing gasket is provided on one side of the movable valve core. A central rod is provided in the middle of the movable valve core. A limiting ring is provided on the central rod. A central hole for the central rod to pass through is provided in the middle of the sealing gasket. The sealing gasket is clamped between the limiting ring and the movable valve core.

[0007] As a preferred embodiment of the above technical solution, a plurality of limit blocks are provided on the inner wall of the front activity chamber, and one end of the spring is clamped between the limit blocks and the limit rod.

[0008] As a preferred embodiment of the above technical solution, the connecting chamber is divided into a horizontal section and a vertical section, the horizontal section is connected to the rear activity chamber, and the vertical section is connected to the installation chamber.

[0009] As a preferred embodiment of the above technical solution, a sealing ring and a limiting clamp ring for limiting the sealing ring are provided in the installation chamber, the limiting clamp ring is buckled with the mother tube, a U-shaped clamping spring is provided on the mother tube, and bayonet ports connecting to the installation chamber are provided on both sides of the mother tube, the U-shaped clamping spring includes two clamping arms, and the clamping arms extend into the installation chamber through the bayonet ports respectively.

[0010] The beneficial effects of the present invention are as follows: In the present invention, the spring cooperates with the movable valve core, combined with the limit tube, limit rod and other components to ensure the stable movement of the movable valve core, avoid jamming, and ensure the long-term reliable operation of the one-way valve; the setting of the sealing gasket and the limit ring greatly enhances the sealing performance and effectively prevents fluid leakage. The U-shaped retaining ring, sealing ring, etc. on the mother pipe make the quick-connect connector easy to install and disassemble, and have good sealing effect and strong stability. The segmented design of the connecting chamber optimizes the fluid transmission path, reduces fluid resistance, and improves transmission efficiency. The overall structure of the quick-connect connector is compact and reasonable, adaptable to a variety of working conditions, and significantly improves the comprehensive performance and reliability of the quick-connect connector with a one-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0012] Figure 2 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0013] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0015] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0016] As Figure 1-2 shown, a quick-connect fitting with a check valve includes a sub-tube 1 and a mother-tube 2. One end of the sub-tube 1 is fixedly and sealingly connected to one end of the mother-tube 2. A check valve structure is provided at the connection between the sub-tube 1 and the mother-tube 2. The check valve structure includes a spring 3 and a movable valve core 4. Inside the sub-tube 1, there are successively a fluid chamber 5 and a front activity chamber 6. Inside the mother-tube 2, there are successively a rear activity chamber 7, a connection chamber 8, and an installation chamber 9. The front activity chamber 6 and the rear activity chamber 7 are connected to form an activity chamber for the movable valve core 4 to move. The connection chamber 8 communicates with the rear activity chamber 7 through a connection port 10. The diameter of the connection port 10 is smaller than the diameter of the movable valve core 4. The mother-tube 2 and the sub-tube 1 are respectively connected to pipelines. When the fluid flows from the mother-tube 2 end towards the sub-tube 1 end, the movable valve core 4 is forced to overcome the elastic force of the spring 3 and move towards the front activity chamber 6, and the fluid flows out of the quick-connect fitting through the connection port 10, the front activity chamber 6, and the fluid chamber 5. When the fluid pressure at the mother-tube 2 end drops to a certain pressure, the movable valve core 4 blocks the connection port 10 under the restoring force of the spring 3 to prevent the fluid at the sub-tube 1 end from flowing through the connection port 10 towards the mother-tube 2 end.

[0017] Further, a limiting tube 11 is fixedly connected to one side of the movable valve core 4. A plurality of side openings 25 are provided around the limiting tube 11. One end of the spring 3 extends into the limiting tube 11, and one end of the spring 3 is sleeved on a plurality of limiting rods 26. The limiting rods 26 are fixedly connected to the sub-tube 1, and the limiting rods 26 are evenly spaced and fixedly connected adjacent to each other. The limiting tube 11 forms a limit for one end of the spring 3, so that the spring 3 can always maintain a state of pressing against the movable valve core 4.

[0018] Further, a sealing gasket 12 is provided on one side of the movable valve core 4. A central rod 13 is provided in the middle of the movable valve core 4. A limiting ring 14 is provided on the central rod 13. A central hole 15 for the central rod 13 to pass through is provided in the middle of the sealing gasket 12. The sealing gasket 12 is clamped between the limiting ring 14 and the movable valve core 4. The sealing gasket 12 improves the sealing performance of the movable valve core 4.

[0019] Further, a plurality of limiting blocks 16 are provided on the inner wall of the front activity chamber 6. One end of the spring 3 is clamped between the limiting blocks 16 and the limiting rods 26. The limiting blocks 16 and the limiting rods 26 form a fixation for one end of the spring 3 to prevent the spring 3 from being displaced.

[0020] Furthermore, the connection chamber 8 is divided into a horizontal section 17 and a vertical section 18. The horizontal section 17 communicates with the activity chamber 7, and the vertical section 18 communicates with the installation chamber 9. The horizontal section 17 and the vertical section 18 form a 90° angle to reduce the direct impact of the fluid on the movable valve core 4.

[0021] Furthermore, a sealing ring 19 and a limit snap ring 27 for restricting the sealing ring 19 are provided in the installation chamber 9. The limit snap ring 27 is buckled with the main pipe 2. A U-shaped snap spring 20 is provided on the main pipe 2. Buckles 21 communicating with the installation chamber 9 are provided on both sides of the main pipe 2. The U-shaped snap spring 20 includes two clamping arms 22, and the clamping arms 22 respectively extend into the installation chamber 9 through the buckles 21. The limit snap ring 27 restricts the position of the sealing ring 19 to prevent its dislocation from affecting the sealing effect. The main pipe 2 is quickly plugged with other pipes through the U-shaped snap spring 20.

[0022] It is worth mentioning that the technical features such as the U-shaped snap spring 20 and the spring 3 involved in this invention patent application should be regarded as prior art. The specific structures, working principles, possible control methods, and spatial arrangement methods of these technical features can be selected conventionally in this field, and should not be regarded as the inventive points of this invention patent. This invention patent will not be further specifically elaborated.

[0023] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in this technical field based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A quick-connect connector with a one-way valve, characterized in that: It includes a sub-tube and a main tube, one end of the sub-tube is fixedly and sealedly connected to one end of the main tube, a one-way valve structure is provided at the connection between the sub-tube and the main tube, the one-way valve structure includes a spring and a movable valve core, a fluid chamber and a front movable chamber are sequentially provided inside the sub-tube, and a rear movable chamber, a connecting chamber and an installation chamber are sequentially provided inside the main tube, the front movable chamber and the rear movable chamber are connected to form an movable chamber for the movable valve core to move, the connecting chamber is connected to the rear movable chamber through a connecting port, and the diameter of the connecting port is smaller than the diameter of the movable valve core.

2. The quick-connect connector with a one-way valve according to claim 1, characterized in that: One side of the movable valve core is fixedly connected to a limit tube, a plurality of side openings are arranged around the limit tube, one end of the spring extends into the limit tube, one end of the spring is sleeved on a plurality of limit rods, the limit rods are fixedly connected to the sub-tubes, the limit rods are evenly spaced, and adjacent limit rods are fixedly connected.

3. The quick-connect connector with a one-way valve according to claim 2, characterized in that: A sealing gasket is provided on one side of the movable valve core, a center rod is provided in the middle of the movable valve core, a limiting ring is provided on the center rod, a center hole for the center rod to pass through is provided in the middle of the sealing gasket, and the sealing gasket is clamped between the limiting ring and the movable valve core.

4. The quick-connect connector with a one-way valve according to claim 2, characterized in that: A plurality of limit blocks are arranged on the inner wall of the front activity chamber, and one end of the spring is clamped between the limit block and the limit rod.

5. The quick-connect connector with a one-way valve according to claim 1, characterized in that: The connecting chamber is divided into a horizontal section and a vertical section, the horizontal section is connected to the rear activity chamber, and the vertical section is connected to the installation chamber.

6. The quick-connect connector with a one-way valve according to claim 5, characterized in that: A sealing ring and a limiting clamp ring for limiting the sealing ring are provided in the installation chamber, the limiting clamp ring is buckled with the mother tube, a U-shaped clamp spring is provided on the mother tube, and bayonet ports connecting to the installation chamber are provided on both sides of the mother tube, the U-shaped clamp spring includes two clamp arms, and the clamp arms extend into the installation chamber through the bayonet ports respectively.

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