Quick-connection one-way valve

Abstract

The utility model provides a quick-connection one-way valve, belongs to the technical field of quick-connection valves, and solves the technical problems that an existing one-way valve cannot be quickly connected and is poor in air tightness after being connected and the like. Comprising a valve body upper shell, a clamping pipe, a sealing gasket and a valve body lower shell, the clamping pipe is arranged in the valve body lower shell in a sliding mode, the sealing gasket is located below the valve body lower shell and arranged on the outer side of the clamping pipe in a sleeving mode, a reset spring is arranged between the clamping pipe and the valve body lower shell, a sealing O-shaped ring is arranged on the valve body lower shell, and the valve body upper shell abuts against the upper end of the sealing O-shaped ring. The valve body upper shell is in threaded connection with the valve body lower shell, a supporting frame is in threaded connection in the valve body upper shell, a flexible diaphragm is arranged on the inner side of the lower end of the supporting frame in a sliding mode, the flexible diaphragm and the supporting frame both extend into the valve body lower shell, and a pressure maintaining spring is arranged between the flexible diaphragm and the supporting frame. The valve can be stably, simply, conveniently and rapidly connected into a pipeline, is good in air tightness, guarantees one-way circulation, has opening pressure, can limit pressure, prolongs the service life of the valve, and is good in shell sealing performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of quick-connect valves and relates to a one-way valve, in particular to a quick-connect one-way valve. Background Art

[0002] In the piping system, the one-way valve plays a vital role as a key component for controlling the one-way flow of fluid. Traditional one-way valves are mostly connected to pipelines by threaded connections, but their installation is time-consuming and labor-intensive, and the threads are easily worn, affecting the sealing and stability of the connection.

[0003] With the development of industry, the demand for one-way valve quick connection function is becoming more and more urgent. In some scenarios where the pipeline system needs to be adjusted frequently, the traditional one-way valve connection method cannot quickly connect to the pipeline, is easy to damage, has poor air tightness, and is difficult to install in some relatively narrow environments.

[0004] Therefore, we propose a quick-connect one-way valve that can be stably and quickly connected to the pipeline, is simple and fast, has good air tightness, ensures one-way flow and has opening pressure, can limit the pressure, increase the service life of the valve, and has good shell sealing. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the existing technology and propose a quick-connect one-way valve. The technical problem to be solved by the utility model is: how to achieve stable and fast access to the pipeline and limit the one-way flow of pressure.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A quick-connect one-way valve comprises a valve body upper shell, a clamping tube, a sealing gasket and a valve body lower shell, the clamping tube is slidably arranged in the valve body lower shell, the sealing gasket is located below the valve body lower shell, and the sealing gasket is sleeved on the outside of the clamping tube, a return spring is arranged between the clamping tube and the valve body lower shell, a sealing O-ring is arranged on the valve body lower shell, and the valve body upper shell abuts against the upper end of the sealing O-ring, the valve body upper shell is threadedly connected to the valve body lower shell, a support frame is threadedly connected in the valve body upper shell, a flexible diaphragm is slidably arranged on the inner side of the lower end of the support frame, and the flexible diaphragm and the support frame both extend into the interior of the valve body lower shell, and a pressure-maintaining spring is arranged between the flexible diaphragm and the support frame.

[0008] The working principle of the utility model is: insert the gas transmission pipeline into the clamping tube, and push the clamping tube to slide in the lower shell of the valve body, the clamping tube moves against the reset spring, and continues to squeeze until the clamping tube is against the lower shell of the valve body, and then the clamping tube is buckled on the lower shell of the valve body. When the pipeline is inserted into the clamping tube, the end of the clamping tube is expanded. When the clamping tube is against the lower shell of the valve body, the end of the clamping tube is tightly fitted on the pipeline, ensuring a tight connection and preventing loosening and leakage.

[0009] When the gas is introduced from the upper shell of the valve body, the gas blows from the upper shell of the valve body through the support frame to the flexible diaphragm, and the flexible diaphragm is pushed by the gas to contact the lower shell of the valve body. The flexible diaphragm fits tightly with the lower shell of the valve body to block the gas from passing through;

[0010] When gas is introduced from the lower shell of the valve body, the gas blows toward the flexible diaphragm through the clamping tube and the lower shell of the valve body. When the pressure is low, the flexible diaphragm contacts the pressure-maintaining spring to block the passage of gas. When a certain pressure is reached, the flexible diaphragm pushes the pressure-maintaining spring and slides on the support frame. The flexible diaphragm no longer contacts the lower shell of the valve body and allows the gas to pass.

[0011] The valve body lower shell includes a lower shell body and four clips evenly distributed around the circumference. The lower shell body is hollow inside. A blocking plate is fixed to one end of the lower shell body. A mounting groove is opened at the other end of the lower shell body. An internal thread is arranged inside the mounting groove. An annular partition with a hole is arranged in the lower shell body. Two symmetrically arranged hinged seats are fixed to the outer side of the valve body lower shell. The four clips are respectively hinged to the hinged seats at corresponding positions. Limiting teeth are arranged on the clips. Two of the clips are threaded with set screws. The set screws are located on the outer sides of the clips at corresponding positions, and the two set screws are symmetrically arranged.

[0012] With the above structure, two buckles and limiting teeth are used to fix the limiting clamping tube, and the two set screws are turned so that the ends of the two set screws respectively contact the pipe to fix the pipe to prevent it from falling off and sliding. The blocking plate is used to install the sealing gasket and block the movement of the clamping tube at the same time. The mounting groove is used to install the upper shell of the valve body and facilitates sealing. The internal thread is used to connect the upper shell of the sealing valve body, and the annular partition with holes facilitates the installation of the reset spring.

[0013] The upper shell of the valve body includes a lower shell valve tube, the lower shell valve tube is hollow inside, an upper shell air pipe is provided at one end of the lower shell valve tube, the upper shell air pipe is connected with the lower shell valve tube, a plurality of evenly spaced inverted skirts are provided on the upper shell air pipe, an internal thread 2 is provided inside the lower shell valve tube, a screw pipe is provided at the other end of the lower shell valve tube, an external thread 1 matching the internal thread 1 is provided on the outer side of the screw pipe, a sealing groove is provided at the end of the screw pipe, and the size and shape of the sealing groove match the sealing O-ring.

[0014] With the above structure, the several inverted skirts are convenient for connection with external pipes, the second internal thread is used for connecting the support frame, and the sealing groove abuts against the sealing O-ring for sealing to enhance air tightness.

[0015] The clamping tube includes a clamping tube, which passes through the blocking plate and extends into the lower shell of the valve body. The inside of the clamping tube is hollow. A circular retaining ring is provided at one end of the clamping tube, and a limiting ring is provided on the circular retaining ring. A plurality of flexible expansion plates evenly distributed in a circle are provided at the other end of the clamping tube. Expansion wedge blocks are provided at the ends of the flexible expansion plates. The diameter of the circle formed between the plurality of flexible expansion plates gradually decreases from bottom to top, and the diameter of the circle formed between the plurality of expansion wedge blocks gradually decreases from bottom to top. A T-shaped rubber sleeve is detachably provided inside the clamping tube, and the T-shaped rubber sleeve matches the shape and size of the clamping tube.

[0016] With the above structure, when the pipeline is inserted, the pipeline enters the buckle tube, and the pipeline moves in the buckle tube while pushing the buckle tube to move in the lower shell body. During the movement, a number of expansion wedge blocks squeeze and push the reset spring. After the pipeline reaches the end of the buckle tube, it pushes a number of flexible expansion plates to open outward, and a number of flexible expansion plates drive the expansion wedge blocks at corresponding positions to open. After the pipeline reaches the end of the expansion wedge block, the circular retaining ring abuts against the blocking plate. At this time, a number of expansion wedge blocks all abut against the inner wall of the lower shell body, and a number of expansion wedge blocks fit tightly with the pipeline, and then push the two buckles and the two limit teeth to buckle on the limit ring. The two buckles and the two limit teeth cooperate with the reset spring to buckle the buckle tube on the lower shell body to ensure that the pipeline fits tightly. The T-shaped rubber sleeve is used to fill the connection between the buckle tube and the pipeline to prevent leakage.

[0017] The flexible diaphragm includes a moving rod, a travel limit seat is provided at the end of the moving rod, a spring fixing hole is provided on the moving rod, the moving rod is slidably arranged on the support frame, a flexible disc is provided on the travel limit seat, and a flexible rubber ring is provided on the outer side of the end of the flexible disc.

[0018] With the above structure, when gas is introduced from the upper shell air pipe, the gas enters from the upper shell air pipe, passes through the support frame and blows to the flexible disc. Under the action of the pressure-maintaining spring and the gas, the flexible disc drives the flexible rubber ring to contact the perforated annular partition plate to block the passage of gas.

[0019] When gas is introduced from the lower shell of the valve body, the gas blows toward the flexible diaphragm through the clamping tube and the lower shell of the valve body. When the pressure is low, under the action of the pressure-maintaining spring, the flexible disc drives the flexible rubber ring to contact the perforated annular partition to block the passage of gas. When a certain pressure is reached, the gas pushes the flexible disc, and the flexible disc drives the travel limit seat and the moving rod to move, while squeezing the pressure-maintaining spring. The moving rod slides on the support frame, and the flexible disc and the flexible rubber ring no longer contact the perforated annular partition, allowing the gas to pass. When the pressure is high, the flexible disc and the travel limit seat respectively contact and fit on the support frame to avoid damage to the flexible disc and limit the maximum pressure.

[0020] The support frame includes a support seat, a pressure-maintaining spring is arranged between the spring fixing hole and the support seat, a plurality of blocking matching blocks evenly distributed in a circle are arranged on the outer side of the support seat, a support block is arranged on the blocking matching block, an arc plate is arranged at the end of the support block, the shape and size of the arc plate match the flexible disc, and a plurality of support blocks are provided with external threads two matching internal threads two.

[0021] With the above structure, the second external thread is used to connect the lower shell valve tube, the support seat is used to support the motion rod and the pressure-maintaining spring, and the arc plate and the blocking matching block are used to fit and support the flexible disc and the travel limit seat when the pressure is large.

[0022] The return spring is arranged in the lower shell of the valve body, and the return spring is located between the annular partition with holes and the blocking plate. The lower end of the return spring is provided with a wedge-shaped locking ring, and the shape and size of the wedge-shaped locking ring match the plurality of expansion wedge blocks;

[0023] The sealing gasket is arranged in the lower shell of the valve body, the sealing gasket is sleeved on the buckle tube, and the sealing gasket is located below the blocking plate;

[0024] The sealing O-ring is arranged at the bottom of the installation groove, and the sealing groove is fitted on the sealing O-ring.

[0025] With the above structure, when the return spring is used to clamp the buckle pipe, it pushes the plurality of expansion wedge blocks, so that the pipe and the plurality of expansion wedge blocks fit tightly, and cooperates with the two buckles and the two limit teeth to ensure the buckle effect and prevent the two buckles from falling off. At the same time, the plurality of expansion wedge blocks abut against the wedge-shaped locking ring, and the wedge-shaped locking ring squeezes the plurality of expansion wedge blocks, so that the plurality of expansion wedge blocks fit tightly against the pipe, thereby enhancing the buckle effect and preventing the pipe from falling off.

[0026] The sealing gasket is used to seal the connection between the buckle tube and the blocking plate to avoid leakage and ensure the sealing effect;

[0027] The sealing O-ring is used to seal the connection between the threaded tube and the lower shell body to enhance air tightness.

[0028] Compared with the existing technology, this quick-connect check valve has the following advantages:

[0029] 1. The upper shell of the valve body is screwed to the lower shell of the valve body and sealed with an O-ring to ensure the shell is sealed and airtight.

[0030] 2. Through the cooperation of the lower shell of the valve body and the return spring, the pipeline is buckled in the lower shell of the valve body, and the pipeline access is stable, simple and fast.

[0031] 3. Through the combination of the clamping tube and the lower shell of the valve body, the pipeline can be quickly connected and fit tightly into the clamping tube, which is efficient and has good airtightness.

[0032] 4. Through the cooperation of the flexible diaphragm and the pressure-maintaining spring, when the gas is introduced, one-way flow is guaranteed and a certain opening pressure is provided to ensure operation under a certain pressure range. In addition, it cooperates with the support frame to limit the maximum pressure and increase the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0034] Figure 2 It is a schematic diagram of the exploded structure of the utility model.

[0035] Figure 3 It is a schematic diagram of the lower three-dimensional structure of the lower shell of the valve body in the utility model.

[0036] Figure 4 It is a schematic diagram of the upper three-dimensional structure of the lower shell of the valve body in the utility model.

[0037] Figure 5 It is a three-dimensional structural schematic diagram of the upper shell of the valve body in the utility model.

[0038] Figure 6 It is a three-dimensional structural schematic diagram of the middle card pipe of the utility model.

[0039] Figure 7 It is a three-dimensional structural schematic diagram of the flexible diaphragm in the utility model.

[0040] Figure 8 It is a front view structural schematic diagram of the flexible diaphragm in the utility model.

[0041] Fig. 9 It is a three-dimensional structural schematic diagram of the support frame in the utility model.

[0042] In the figure, 1, valve body upper shell; 2, valve body lower shell; 3, clamping tube; 4, sealing gasket; 5, return spring; 6, sealing O-ring; 7, flexible diaphragm; 8, support frame; 9, buckle; 10, hinged seat; 11, blocking plate; 12, limiting teeth; 13, mounting groove; 14, internal thread 1; 15, annular partition with holes; 16, inverted skirt; 17, upper shell air pipe; 18, external thread 1; 19, lower shell body; 20, screw tube ; 21. Internal thread II; 22. Lower shell valve tube; 23. Limit ring; 24. Buckle tube; 25. Flexible expansion plate; 26. Expansion wedge block; 27. Movement rod; 28. Travel limit seat; 29. ​​Flexible rubber ring; 30. Flexible disc; 31. Support seat; 32. Support block; 33. Blocking matching block; 34. Arc plate; 35. External thread II; 36. Pressure-maintaining spring; 37. T-type rubber sleeve; 38. Set screw. DETAILED DESCRIPTION

[0043] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0044] like Figure 1-Figure 9 As shown, the quick-connect one-way valve comprises a valve body upper shell 1, a clamping tube 3, a sealing gasket 4 and a valve body lower shell 2. The clamping tube 3 is slidably arranged in the valve body lower shell 2, the sealing gasket 4 is located below the valve body lower shell 2, and the sealing gasket 4 is sleeved on the outside of the clamping tube 3. A reset spring 5 is arranged between the clamping tube 3 and the valve body lower shell 2, a sealing O-ring 6 is arranged on the valve body lower shell 2, and the valve body upper shell 1 abuts against the upper end of the sealing O-ring 6, the valve body upper shell 1 is screwed with the valve body lower shell 2, a support frame 8 is screwed in the valve body upper shell 1, a flexible diaphragm 7 is slidably arranged on the inner side of the lower end of the support frame 8, and the flexible diaphragm 7 and the support frame 8 both extend into the interior of the valve body lower shell 2, and a pressure-maintaining spring 36 is arranged between the flexible diaphragm 7 and the support frame 8.

[0045] In this embodiment, the gas pipeline is inserted into the clamping tube 3, and the clamping tube 3 is pushed to slide in the lower shell 2 of the valve body. The clamping tube 3 moves against the reset spring 5 and continues to be squeezed until the clamping tube 3 is against the lower shell 2 of the valve body. Then, the clamping tube 3 is buckled on the lower shell 2 of the valve body. When the pipeline is inserted into the clamping tube 3, the end of the clamping tube 3 is expanded. When the clamping tube 3 is against the lower shell 2 of the valve body, the end of the clamping tube 3 is tightly fitted on the pipeline to ensure a tight connection and prevent loosening and leakage.

[0046] When gas is introduced from the upper shell 1 of the valve body, the gas blows from the upper shell 1 of the valve body through the support frame 8 to the flexible diaphragm 7, and the flexible diaphragm 7 is pushed by the gas to contact the lower shell 2 of the valve body. The flexible diaphragm 7 fits tightly with the lower shell 2 of the valve body to block the passage of gas;

[0047] When gas is introduced from the valve body lower shell 2, the gas is blown toward the flexible diaphragm 7 through the clamping tube 3 and the valve body lower shell 2. When the pressure is low, the flexible diaphragm 7 contacts the pressure-maintaining spring 36 to block the passage of gas. When a certain pressure is reached, the flexible diaphragm 7 pushes the pressure-maintaining spring 36 and slides on the support frame 8. The flexible diaphragm 7 no longer contacts the valve body lower shell 2 and allows the gas to pass.

[0048] The valve body lower shell 2 includes a lower shell body 19 and four circumferentially evenly distributed buckles 9. The lower shell body 19 is hollow inside, a blocking plate 11 is fixed to one end of the lower shell body 19, and a mounting groove 13 is opened at the other end of the lower shell body 19. An internal thread 14 is arranged inside the mounting groove 13, and a ring-shaped partition plate 15 with a hole is arranged inside the lower shell body 19. Two symmetrically arranged hinge seats 10 are fixed to the outer side of the valve body lower shell 2, and the four buckles 9 are respectively hinged to the hinge seats 10 at corresponding positions. Limiting teeth 12 are arranged on the buckles 9, and two of the buckles 9 are threaded with set screws 38, and the set screws 38 are located on the outer sides of the buckles 9 at corresponding positions, and the two set screws 38 are symmetrically arranged.

[0049] In this embodiment, the two buckles 9 and the limiting teeth 12 are used to fix the limiting clamping tube 3. The two fixing screws 38 are turned so that the ends of the two fixing screws 38 respectively contact the pipeline to fix the pipeline to prevent it from falling off and sliding. The blocking plate 11 is used to install the sealing gasket 4 and block the movement of the clamping tube 3. The mounting groove 13 is used to install the valve body upper shell 1 and facilitate sealing. The internal thread 14 is used to connect the sealing valve body upper shell 1. The perforated annular partition plate 15 facilitates the installation of the reset spring 5.

[0050] The upper shell 1 of the valve body includes a lower shell valve tube 22, the lower shell valve tube 22 is hollow inside, an upper shell air pipe 17 is provided at one end of the lower shell valve tube 22, the upper shell air pipe 17 is connected to the lower shell valve tube 22, a plurality of equally spaced inverted skirts 16 are provided on the upper shell air pipe 17, an internal thread 21 is provided inside the lower shell valve tube 22, a screw tube 20 is provided at the other end of the lower shell valve tube 22, an external thread 18 matching the internal thread 14 is provided on the outer side of the screw tube 20, a sealing groove is provided at the end of the screw tube 20, and the size and shape of the sealing groove match the sealing O-ring 6.

[0051] In this embodiment, a plurality of inverted skirts 16 are convenient for connection with external pipes, the second internal thread 21 is used for connecting with the support frame 8, and the sealing groove abuts against the sealing O-ring 6 for sealing to enhance air tightness.

[0052] The clamping tube 3 includes a clamping tube 24, which passes through the blocking plate 11 and extends into the lower shell 2 of the valve body. The inside of the clamping tube 24 is hollow. A circular retaining ring is provided at one end of the clamping tube 24, and a limiting ring 23 is provided on the circular retaining ring. The other end of the clamping tube 24 is provided with a plurality of flexible expansion plates 25 evenly distributed in a circle. The ends of the flexible expansion plates 25 are provided with expansion wedge blocks 26. The diameter of the circle formed between the plurality of flexible expansion plates 25 gradually decreases from bottom to top, and the diameter of the circle formed between the plurality of expansion wedge blocks 26 gradually decreases from bottom to top. A T-shaped rubber sleeve 37 is detachably provided inside the clamping tube 3, and the T-shaped rubber sleeve 37 matches the shape and size of the clamping tube 3.

[0053] In this embodiment, when the pipeline is inserted, the pipeline enters the buckle tube 24. While the pipeline moves in the buckle tube 24, it pushes the buckle tube 24 to move in the lower shell body 19. During the movement, the plurality of expansion wedge blocks 26 squeeze and push the reset spring 5. After the pipeline reaches the end of the buckle tube 24, it pushes the plurality of flexible expansion plates 25 to open outward, and the plurality of flexible expansion plates 25 drive the expansion wedge blocks 26 at the corresponding positions to open. After the pipeline reaches the end of the expansion wedge block 26, the circular retaining ring abuts against the blocking plate 11. At this time, the plurality of expansion wedge blocks 26 all abut against the inner wall of the lower shell body 19. The plurality of expansion wedge blocks 26 fit tightly with the pipeline, and then push the two buckles 9 and the two limiting teeth 12 to fit on the limiting ring 23. The two buckles 9 and the two limiting teeth 12 cooperate with the reset spring 5 to buckle the buckle tube 24 on the lower shell body 19 to ensure that the pipeline fits tightly. The T-shaped rubber sleeve 37 is used to fill the connection between the buckle tube 24 and the pipeline to prevent leakage.

[0054] The flexible diaphragm 7 includes a moving rod 27, a travel limit seat 28 is provided at the end of the moving rod 27, a spring fixing hole is provided on the moving rod 27, the moving rod 27 is slidably set on the support frame 8, a flexible disc 30 is provided on the travel limit seat 28, and a flexible rubber ring 29 is provided on the outer side of the end of the flexible disc 30.

[0055] In this embodiment, when gas is introduced from the upper shell gas pipe 17, the gas enters from the upper shell gas pipe 17, passes through the support frame 8 and blows toward the flexible disc 30. Under the action of the pressure-maintaining spring 36 and the gas, the flexible disc 30 drives the flexible rubber ring 29 to contact the perforated annular partition 15, thereby blocking the passage of gas.

[0056] When gas is introduced from the lower shell 2 of the valve body, the gas blows toward the flexible diaphragm 7 through the clamping tube 3 and the lower shell 2 of the valve body. When the pressure is relatively low, under the action of the pressure-maintaining spring 36, the flexible disc 30 drives the flexible rubber ring 29 to contact the perforated annular partition 15 to block the passage of gas. After reaching a certain pressure, the gas pushes the flexible disc 30, and the flexible disc 30 drives the travel limit seat 28 and the moving rod 27 to move, while squeezing the pressure-maintaining spring 36. The moving rod 27 slides on the support frame 8, and the flexible disc 30 and the flexible rubber ring 29 no longer contact the perforated annular partition 15, allowing the gas to pass. When the pressure is relatively high, the flexible disc 30 and the travel limit seat 28 respectively contact and fit on the support frame 8 to avoid damage to the flexible disc 30 and limit the maximum pressure.

[0057] The support frame 8 includes a support seat 31, a pressure-maintaining spring 36 is arranged between the spring fixing hole and the support seat 31, and a plurality of blocking matching blocks 33 evenly distributed in a circle are arranged on the outer side of the support seat 31, and support blocks 32 are arranged on the blocking matching blocks 33, and arc plates 34 are arranged at the ends of the support blocks 32, and the shape and size of the arc plates 34 are matched with the flexible disc 30, and external threads 35 matching the internal threads 21 are arranged on the plurality of support blocks 32.

[0058] In this embodiment, the second external thread 35 is used to connect the lower shell valve tube 22, the support seat 31 is used to support the movement rod 27 and the pressure-maintaining spring 36, and the arc plate 34 and the blocking matching block 33 are used to fit and support the flexible disc 30 and the travel limit seat 28 when the pressure is relatively high.

[0059] The return spring 5 is arranged in the lower shell 2 of the valve body, and the return spring 5 is located between the perforated annular partition 15 and the blocking plate 11. The lower end of the return spring 5 is provided with a wedge-shaped locking ring, and the shape and size of the wedge-shaped locking ring match the plurality of expansion wedge blocks 26;

[0060] The sealing gasket 4 is arranged in the lower shell 2 of the valve body, the sealing gasket 4 is sleeved on the buckle tube 24, and the sealing gasket 4 is located below the blocking plate 11;

[0061] The sealing O-ring 6 is arranged at the bottom of the installation groove 13 , and the sealing groove is fitted on the sealing O-ring 6 .

[0062] In this embodiment, the return spring 5 is used to push the plurality of expansion wedge blocks 26 when the buckle tube 24 is engaged, so that the pipe and the plurality of expansion wedge blocks 26 are closely fitted, and cooperate with the two buckles 9 and the two limiting teeth 12 to ensure the buckle effect and prevent the two buckles 9 from falling off. At the same time, the plurality of expansion wedge blocks 26 abut against the wedge-shaped locking ring, and the wedge-shaped locking ring squeezes the plurality of expansion wedge blocks 26, so that the plurality of expansion wedge blocks 26 are closely fitted to the pipe, thereby enhancing the buckle effect and preventing the pipe from falling off.

[0063] The sealing gasket 4 is used to seal the connection between the buckle tube 24 and the blocking plate 11 to avoid leakage and ensure the sealing effect;

[0064] The sealing O-ring is used to seal the connection between the threaded tube 20 and the lower shell body 19 to enhance air tightness.

[0065] The working principle of the utility model is as follows: when inserting the pipeline, the pipeline enters the buckle tube 24, and the pipeline moves in the buckle tube 24 while pushing the buckle tube 24 to move in the lower shell body 19. During the movement, a plurality of expansion wedge blocks 26 squeeze and push the reset spring 5. After the pipeline reaches the end of the buckle tube 24, it pushes a plurality of flexible expansion plates 25 to open outward, and a plurality of flexible expansion plates 25 drive the expansion wedge blocks 26 at corresponding positions to open. After the pipeline reaches the end of the expansion wedge block 26, the circular retaining ring abuts against the blocking plate 11. At this time, the plurality of expansion wedge blocks 26 are all against the inner wall of the lower shell body 19, and the plurality of expansion wedge blocks 26 are tightly fitted with the pipeline, and then the two buckles 9 and the two limiting teeth 12 are pushed to buckle on the limiting ring 23, and the two buckles 9 and the two limiting teeth 12 cooperate with the reset spring 5 to buckle the buckle tube 24 on the lower shell body 19 to ensure that the pipeline is tightly fitted to prevent loosening and leakage, and then the two fixing screws 38 are screwed so that the ends of the two fixing screws 38 are respectively against the pipeline to fix the pipeline and prevent it from falling off;

[0066] When the gas is introduced from the upper shell air pipe 17, the gas enters from the upper shell air pipe 17, passes through the support frame 8 and blows toward the flexible disc 30. Under the action of the pressure-maintaining spring 36 and the gas, the flexible disc 30 drives the flexible rubber ring 29 to contact the perforated annular partition 15, thereby blocking the gas from passing through.

[0067] When gas is introduced from the lower shell 2 of the valve body, the gas is blown toward the flexible diaphragm 7 through the clamping tube 3 and the lower shell 2 of the valve body. When the pressure is relatively low, under the action of the pressure-maintaining spring 36, the flexible disc 30 drives the flexible rubber ring 29 to contact the perforated annular partition 15 to block the passage of gas. After reaching a certain pressure, the gas pushes the flexible disc 30, and the flexible disc 30 drives the travel limit seat 28 and the moving rod 27 to move, while squeezing the pressure-maintaining spring 36. The moving rod 27 slides on the support frame 8, and the flexible disc 30 and the flexible rubber ring 29 no longer contact the perforated annular partition 15, allowing the gas to pass. When the pressure is relatively high, the flexible disc 30 and the travel limit seat 28 respectively contact and fit on the arc plate 34 and the blocking matching block 33 to avoid damage to the flexible disc 30 and limit the maximum pressure.

[0068] In summary, the upper valve shell 1 and the lower valve shell 2 are screwed together and sealed with an O-ring 6 to ensure the sealing of the shell and ensure air tightness;

[0069] Through the cooperation between the valve body lower shell 2 and the return spring 5, the pipeline is buckled in the valve body lower shell 2, and the pipeline access is stable, simple and fast;

[0070] Through the combination of the clamping tube 3 and the lower shell 2 of the valve body, the pipeline can be quickly connected and the pipeline can be tightly fitted in the clamping tube 3, which is efficient and has good air tightness;

[0071] By cooperating with the flexible diaphragm 7 and the pressure-maintaining spring 36, when gas is introduced, one-way flow is guaranteed and a certain opening pressure is provided to ensure operation under a certain pressure range. In addition, the maximum pressure is limited in cooperation with the support frame 8 to increase the service life of the valve.

[0072] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A quick-connect one-way valve, comprising a valve body upper shell (1), a clamping tube (3), a sealing gasket (4) and a valve body lower shell (2), characterized in that: The clamping tube (3) is slidably arranged in the lower shell (2) of the valve body, the sealing gasket (4) is located below the lower shell (2) of the valve body, and the sealing gasket (4) is sleeved on the outer side of the clamping tube (3), a return spring (5) is arranged between the clamping tube (3) and the lower shell (2) of the valve body, a sealing O-ring (6) is arranged on the lower shell (2) of the valve body, and the upper shell (1) of the valve body abuts against the upper end of the sealing O-ring (6), the upper shell (1) of the valve body and the lower shell (2) of the valve body are screwed together, a support frame (8) is screwed inside the upper shell (1) of the valve body, a flexible diaphragm (7) is slidably arranged on the inner side of the lower end of the support frame (8), and the flexible diaphragm (7) and the support frame (8) both extend into the lower shell (2) of the valve body, and a pressure-maintaining spring (36) is arranged between the flexible diaphragm (7) and the support frame (8).

2. A quick-connect one-way valve according to claim 1, characterized in that: The valve body lower shell (2) comprises a lower shell body (19) and four buckles (9) evenly distributed in a circle, the lower shell body (19) is hollow inside, a blocking plate (11) is fixed at one end of the lower shell body (19), a mounting groove (13) is opened at the other end of the lower shell body (19), an internal thread (14) is provided inside the mounting groove (13), a ring-shaped partition plate (15) with a hole is provided inside the lower shell body (19), two symmetrically arranged hinge seats (10) are fixed on the outer side of the valve body lower shell (2), the four buckles (9) are respectively hinged on the hinge seats (10) at corresponding positions, and the buckles (9) are each provided with a limiting tooth (12), wherein two buckles (9) are both threaded with a fixing screw (38), the fixing screws (38) are both located on the outer side of the buckles (9) at corresponding positions, and the two fixing screws (38) are symmetrically arranged.

3. A quick-connect one-way valve according to claim 2, characterized in that: The valve body upper shell (1) comprises a lower shell valve tube (22). The lower shell valve tube (22) is hollow inside. An upper shell air tube (17) is provided at one end of the lower shell valve tube (22). The upper shell air tube (17) is connected to the lower shell valve tube (22). The upper shell air tube (17) is provided with a plurality of equally spaced inverted skirts (16). An internal thread (21) is provided inside the lower shell valve tube (22). A screw tube (20) is provided at the other end of the lower shell valve tube (22). An external thread (18) matching the internal thread (14) is provided on the outer side of the screw tube (20). A sealing groove is provided at the end of the screw tube (20). The size and shape of the sealing groove match the sealing O-ring (6).

4. A quick-connect one-way valve according to claim 3, characterized in that: The clamping tube (3) comprises a clamping tube (24), the clamping tube (24) passes through the blocking plate (11) and extends into the lower shell (2) of the valve body, the interior of the clamping tube (24) is hollow, one end of the clamping tube (24) is provided with a circular retaining ring, the circular retaining ring is provided with a limiting ring (23), the other end of the clamping tube (24) is provided with a plurality of flexible expansion plates (25) evenly distributed in a circumference, the ends of the flexible expansion plates (25) are provided with expansion wedge blocks (26), the diameter of the circumference formed between the plurality of flexible expansion plates (25) gradually decreases from bottom to top, and the diameter of the circumference formed between the plurality of expansion wedge blocks (26) gradually decreases from bottom to top, and a T-shaped rubber sleeve (37) is detachably provided inside the clamping tube (3), the T-shaped rubber sleeve (37) being matched with the shape and size of the clamping tube (3).

5. A quick-connect one-way valve according to claim 4, characterized in that: The flexible diaphragm (7) comprises a moving rod (27), a travel limit seat (28) is provided at the end of the moving rod (27), a spring fixing hole is provided on the moving rod (27), the moving rod (27) is slidably arranged on the support frame (8), a flexible disc (30) is provided on the travel limit seat (28), and a flexible rubber ring (29) is provided on the outer side of the end of the flexible disc (30).

6. A quick-connect one-way valve according to claim 5, characterized in that: The support frame (8) comprises a support seat (31), a pressure-maintaining spring (36) is arranged between the spring fixing hole and the support seat (31), a plurality of blocking matching blocks (33) evenly distributed in a circumference are arranged on the outer side of the support seat (31), a support block (32) is arranged on each of the blocking matching blocks (33), an arc plate (34) is arranged at the end of each of the support blocks (32), the shape and size of the arc plate (34) are matched with the flexible disc (30), and a plurality of support blocks (32) are provided with external threads (35) matching the internal threads (21).

7. A quick-connect one-way valve according to claim 6, characterized in that: The return spring (5) is arranged in the lower shell (2) of the valve body, and the return spring (5) is located between the annular partition plate (15) with holes and the blocking plate (11), and a wedge-shaped locking ring is provided at the lower end of the return spring (5), and the shape and size of the wedge-shaped locking ring match the plurality of expansion wedge blocks (26); The sealing gasket (4) is arranged in the lower shell (2) of the valve body, the sealing gasket (4) is sleeved on the buckle tube (24), and the sealing gasket (4) is located below the blocking plate (11); The sealing O-ring (6) is arranged at the bottom of the installation groove (13), and the sealing groove is fitted on the sealing O-ring (6).

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