Axial-flow type check valve

Abstract

The invention relates to the technical field of valves, in particular to an axial-flow type check valve which comprises a valve body, a valve seat, a valve clack and a guide rod, a flow guide sleeve is arranged in the valve body, a guide frame is arranged in the flow guide sleeve, a guide ring is arranged in the valve seat, the guide rod axially penetrates through the guide ring and the guide frame, and the guide rod is axially sleeved with the valve clack. The guide rod is sleeved with a reset spring, the two ends of the reset spring abut against the guide frame and the valve clack correspondingly, the anti-impact assembly is used for protecting the valve clack, the slow closing assembly is used for slowing down the closing speed of the valve clack, and the adjusting assembly is used for balancing the water pressure in the valve. According to the check valve, through cooperation of the anti-impact assembly, the slow closing assembly and the adjusting assembly, the impact force generated when water is injected into the check valve can be effectively resisted, meanwhile, the impact force generated when the valve clack is rapidly closed can be avoided, and therefore the service life of the check valve is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of valves, and in particular to an axial flow check valve. Background Art

[0002] The axial flow check valve is a protection device used to prevent the backflow of the medium. It adopts an axial flow shuttle structure, and the valve flap is installed with a buffer shock-absorbing spring, avoiding the impact vibration between the valve flap and the valve body when the ordinary check valve is opened.

[0003] In the related art, when the axial flow check valve is opened / closed too fast, the pressure in the pipeline suddenly rises. After the pressure in the pipeline rises, it promotes the increase of the flow velocity of the medium in the pipeline. The high-speed flowing medium is easy to form water hammer at the pipeline turning point and damage the pipeline, affecting the service life. Summary of the Invention

[0004] In order to improve the service life of the check valve, the purpose of this application is to provide an axial flow check valve.

[0005] An axial flow check valve provided by this application adopts the following technical solutions: An axial flow check valve includes a valve body, a valve seat, a valve flap and a guide rod. A flow guide sleeve is arranged in the valve body, a guide frame is arranged in the flow guide sleeve, and a guide ring is arranged in the valve seat. The guide rod axially penetrates through the guide ring and the guide frame respectively. The valve flap is axially sleeved on the guide rod, and a return spring is sleeved on the guide rod. The two ends of the return spring are respectively abutted against the guide frame and the valve flap. It also includes an impact resistance component, including a buffer rubber sheet arranged on the valve flap, and the guide rod axially penetrates through the buffer rubber sheet, and inert gas is injected between the buffer rubber sheet and the valve flap; a slow closing component, including a telescopic outer rod rotatably connected to the valve seat. A sliding groove is opened in the telescopic outer rod, a slow closing spring is arranged at the bottom of the sliding groove, a telescopic inner rod is arranged on the slow closing spring, and the telescopic inner rod is rotatably connected to the guide ring; an adjustment component, which is used to balance the water pressure in the valve.

[0006] By adopting the above technical solutions, the connection between the buffer rubber sheet and the valve flap enables the buffer rubber sheet to form a buffer airbag between the valve flaps, and thus resists the impact force generated when the check valve is just filled with water, effectively reducing the impact force received by the valve flap, thereby improving the service life of the valve flap.

[0007] When the valve flap closes, the return spring deforms, releasing the stored kinetic energy to push the valve flap to slide towards the valve seat, so that the guide ring pulls the slow closing spring and deforms and stretches the slow closing spring, thereby consuming part of the force of the return spring, thus reducing the speed of the valve flap when closing, thereby avoiding the impact force formed by the rapid closing of the valve flap, and effectively improving the service life of the check valve.

[0008] Optionally, the anti-impact component further comprises a sliding ring axially sleeved on the guide rod, the sliding ring slides along the surface of the guide rod, and a side of the sliding ring facing away from the guide rod is connected to the buffer rubber.

[0009] By adopting the above technical solution, when the buffer rubber is subjected to impact force, it slides on the surface of the guide rod, thereby consuming the kinetic energy of the impact force, thereby increasing the service life of the valve disc.

[0010] Optionally, an anti-impact spring is provided on the axial sleeve of the guide rod, one end of the anti-impact spring abuts against the sliding ring, and the other end of the anti-impact spring abuts against the valve disc.

[0011] By adopting the above technical solution, when the sliding ring slides toward the valve disc under impact, the sliding ring contacts the anti-impact spring, thereby reducing the sliding speed of the sliding ring and effectively avoiding damage to the valve disc.

[0012] Optionally, a buffer groove is provided on the valve disc, the anti-impact spring extends into the buffer groove, and the sliding ring extends into the buffer groove and abuts against the side wall of the buffer groove.

[0013] By adopting the above technical solution, after the sliding ring extends into the buffer groove, the buffer rubber abuts against the valve disc, thereby increasing the pressure on the valve disc and causing the valve disc to slide.

[0014] Optionally, the guide rod is provided with a plurality of adjustment holes between the sliding ring and the guide ring, and the adjustment assembly includes a first adjustment airbag arranged in the guide rod, and the first adjustment airbag is provided with a first adjustment tube extending between the buffer rubber and the valve disc.

[0015] By adopting the above technical solution, external fluid can flow into the guide rod through the adjustment hole. At the same time, when the buffer rubber abuts against the valve flap, the first adjustment airbag is inflated, thereby increasing the volume of the first adjustment airbag to supplement the volume after the buffer rubber and the valve flap are fitted.

[0016] Optionally, a first adjusting spring is arranged in the guide rod, one end of the first adjusting spring is connected to a side of the first adjusting airbag away from the adjusting hole, and the other end of the first adjusting spring is connected to an inner wall of the guide rod.

[0017] By adopting the above technical solution, when the first regulating airbag is inflated, the first regulating airbag squeezes the first regulating spring and causes the first regulating spring to deform and compress; when the first regulating airbag is deflated, the first regulating spring deforms and stretches to squeeze out the gas in the first regulating airbag, thereby realizing automatic inflation of the buffer rubber.

[0018] Optionally, one end of the first adjusting airbag away from the first adjusting spring is provided with one end of a second adjusting spring, the other end of the second adjusting spring is provided with a second adjusting airbag, the end of the second adjusting airbag away from the second adjusting spring is connected to the inner wall of the guide rod, and a second adjusting tube extending into the telescopic inner rod is provided on the second adjusting airbag.

[0019] By adopting the above technical solution, after the first adjusting airbag is inflated, the second adjusting airbag is compressed, so that the gas in the second adjusting airbag flows into the telescopic inner rod through the second adjusting tube, thereby driving the telescopic inner rod to contract.

[0020] Optionally, a rotating groove is formed on the guide ring, a rotating shaft is arranged on the inner wall of the rotating groove, the rotating shaft extends into the telescopic inner rod, and the second adjusting tube is arranged inside the rotating shaft, and a plurality of elastic adjusting surfaces are arranged on the surface of the telescopic inner rod.

[0021] By adopting the above technical solution, it is realized that the telescopic inner rod can be inflated inside while rotating, and after inflation, it can protrude outward through the elastic adjusting surface to balance the water pressure in the valve.

[0022] Optionally, a piston is slidably connected inside the telescopic inner rod, a rack extending into the telescopic outer rod is arranged on the piston, one end of the telescopic inner rod inside the telescopic outer rod is rotatably connected with a gear meshing with the rack, and a tooth groove meshing with the gear is arranged on the inner wall of the telescopic outer rod.

[0023] By adopting the above technical solution, when the telescopic inner rod contracts, the gear rotates to drive the piston to contract, and at the same time, when the telescopic inner rod stretches, the piston rod stretches.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The impact force generated when the check valve is just filled with water can be effectively resisted by the buffer rubber in the present application, and the impact force received by the valve flap is effectively reduced, thereby improving the service life of the valve flap; 2. The slow-closing component in the present application can effectively reduce the closing speed of the valve flap through the slow-closing component, thereby avoiding the impact force formed by the rapid closing of the valve flap and improving the service life of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of Embodiment 1 of the present application; Figure 2 is a schematic structural diagram of Embodiment 1 of the present application, mainly showing the fixed rod; Figure 3 is a schematic structural diagram of Embodiment 2 of the present application; Figure 4 is Figure 3 a partial enlarged schematic diagram of part A in Figure 5 isFigure 3 Partial enlarged schematic view of part B in Figure 6 is Figure 3 Partial enlarged schematic view of part C in

[0026] Description of the drawings: 1. Valve body; 2. Valve seat; 3. Guide ring; 4. Flow guide sleeve; 5. Guide rod; 6. Valve flap; 7. Impact resistance component; 701. Sliding ring; 702. Buffer rubber; 703. Impact resistance spring; 8. Slow closing component; 801. Telescopic outer rod; 802. Slow closing spring; 803. Telescopic inner rod; 804. Clamping ring; 805. Ball; 806. Clamping spring; 807. Gear; 808. Rack; 809. Tooth groove; 810. Piston; 811. Elastic adjustment surface; 9. Adjustment component; 901. First adjustment airbag; 902. Second adjustment airbag; 903. First adjustment spring; 904. Second adjustment spring; 905. First adjustment pipe; 906. Second adjustment pipe; 10. Flow guide plug; 11. Fixed ring; 12. Positioning ring; 13. Fixed rod; 14. Return spring; 15; Buffer groove; 16. Sliding groove; 17; Fixed groove; 18. Rotating groove; 19. Rotating shaft; 20. Adjustment hole. Detailed description of the specific implementation

[0027] The following combines the attached Figure 1 - attached Figure 6 to further elaborate on this application in detail. Embodiment 1:

[0028] An axial flow check valve, referring to Figure 1 、 Figure 2 , includes a valve body 1, one end of the valve body 1 is embedded with a valve seat 2, and the valve seat 2 is in interference fit with the inner wall of the valve body 1. A guide ring 3 is arranged in the valve seat 2, and two fixed rods 13 are fixedly connected to the guide ring 3, and the fixed rods 13 are fixedly connected to the valve seat 2.

[0029] A number of metal first connection pieces are fixedly connected in the valve body 1, and one end of the metal first connection piece away from the inner wall of the valve body 1 is fixedly connected with a flow guide sleeve 4. The end of the flow guide sleeve 4 away from the positioning ring 12 is threadedly connected with a flow guide plug 10, and a through hole for the flow of the fluid is opened on the flow guide plug 10. In addition, a number of second connection pieces are fixedly connected in the flow guide sleeve 4, one end of the second connection piece away from the flow guide sleeve 4 is fixedly connected with a fixed ring 11, and a positioning ring 12 is axially inserted into the fixed ring 11, and the positioning ring 12 is fixed with a fixing screw.

[0030] A guide rod 5 axially penetrates through the guide ring 3 and the positioning ring 12. The guide rod 5 slides in the guide ring 3 and the positioning ring 12. An arc-shaped valve flap 6 fixedly connected to its own surface is axially sleeved on the guide rod 5. The valve flap 6 is located between the guide ring 3 and the positioning ring 12, and the side of the valve flap 6 facing the guide ring 3 is arc-shaped and convex.

[0031] A sealing ring is embedded at one end of the valve seat 2 close to the positioning ring 12, and the arc-shaped edge of the valve flap 6 abuts against the valve seat 2 and the sealing ring. A return spring 14 is axially sleeved on the guide ring 3. One end of the return spring 14 is fixedly connected to the side of the valve flap 6 away from the guide ring 3, and the other end of the return spring 14 is fixedly connected to the positioning ring 12.

[0032] The implementation principle of Embodiment 1 of this application is as follows: After the valve body 1 is installed, the fluid flows into the valve body 1 from one side of the guide ring 3. When the fluid accumulates to a certain extent, it pushes the valve flap 6 to separate the valve flap 6 from the valve seat 2, so that the fluid flows into the space of the valve body 1 where the flow guide sleeve 4 is located. As the fluid continues to flow, the fluid pushes the valve flap 6 towards the flow guide sleeve 4, causing the valve flap 6 to abut against the flow guide sleeve 4. At the same time, the return spring 14 deforms and stretches. When the fluid stops flowing in, the return spring 14 deforms and stretches to push the valve flap 6 to slide towards the valve seat 2, causing the valve flap 6 to abut against the valve seat 2, so as to prevent the fluid in the valve seat 2 from flowing into the space of the valve body 1 where the flow guide sleeve 4 is located through the valve flap 6. Embodiment 2:

[0033] An axial flow check valve, see Figure 3 , which is different from Embodiment 1 in that it further includes an impact-resistant component 7 for protecting the valve flap 6, a slow-closing component 8 for slowing down the closing speed of the valve flap 6, and an adjustment component 9 for balancing the water pressure in the valve.

[0034] See Figure 3 , Figure 4 , the impact-resistant component 7 includes a sliding ring 701 slidably connected to the guide rod 5, and a sealing ring is embedded in the inner wall of the sliding ring 701, and the inner ring of the sealing ring abuts against the guide rod 5. In addition, an arc-shaped buffer rubber 702 is fixedly connected to the outer wall of the sliding ring 701, and the edge of the buffer rubber 702 is fixedly connected to the arc-shaped edge of the valve flap 6, so that a buffer cavity is formed between the buffer rubber 702 and the valve flap 6, and an inert gas is injected into the buffer cavity to form a buffer airbag.

[0035] See Figure 4 , an arc-shaped buffer groove 15 is formed on the side of the valve flap 6 facing the buffer rubber 702. One end of an impact-resistant spring 703 is fixedly connected to the bottom of the buffer groove 15, and the other end of the impact-resistant spring 703 is fixedly connected to the sliding ring 701, and the impact-resistant spring 703 is axially sleeved on the surface of the guide rod 5. Among them, the impact-resistant spring 703 includes a dense part and a sparse part. When the buffer rubber 702 is impacted, the sliding ring 701 squeezes the buffer spring, so that the sparse part of the buffer spring quickly contracts to respond to the external fluid, weakens the impact of the external fluid through the dense part, and makes the sliding ring 701 slowly insert into the buffer groove 15.

[0036] See Figure 3 ,Figure 5 The slow - closing component 8 includes two telescopic outer rods 801 rotatably connected to the inner wall of the valve seat 2. The telescopic outer rod 801 is in the shape of a test tube. A sliding groove 16 is formed in the telescopic outer rod 801, and the opening of the sliding groove 16 faces the guide rod 5. One end of a slow - closing spring 802 is fixedly connected to the bottom of the sliding groove 16, and the other end of the slow - closing spring 802 is fixedly connected to a telescopic inner rod 803 in the shape of a test tube. The open end of the telescopic inner rod 803 extends into the sliding groove 16 and slides along the direction in which the sliding groove 16 is formed.

[0037] A clamping ring 804 is fixedly connected to the telescopic outer rod 801, and the clamping ring 804 is sleeved outside the telescopic inner rod 803. Two clamping grooves are formed in the clamping ring 804. A ball 805 is rotatably arranged in the clamping groove, and one end of a clamping spring 806 is fixedly connected to the bottom of the clamping groove, and the other end of the clamping spring 806 abuts against the ball 805.

[0038] Two arc - shaped fixing grooves 17 corresponding to the positions of the balls 805 are formed on the outer surface of the telescopic inner rod 803, and the slope of the arc - shaped fixing groove 17 on the side away from the valve seat 2 is smaller than the slope of the fixing groove 17 on the side close to the valve seat 2. When the telescopic inner rod 803 slides away from the telescopic outer rod 801 and at the same time the valve flap 6 abuts against the valve seat 2, the ball 805 extends into the fixing groove 17 and abuts against the fixing groove 17. In addition, a sealing ring abutting against the surface of the telescopic inner rod 803 is arranged on the clamping ring 804.

[0039] See Figure 5 、 Figure 6 Two gears 807 are rotatably connected to the open end of the telescopic inner rod 803. The gears 807 abut against the telescopic outer rod 801. Two tooth grooves 809 corresponding to the positions of the two gears 807 are formed in the inner wall of the telescopic outer rod 801, and the tooth grooves 809 are meshed with the gears 807. At the same time, a piston 810 is slidably connected in the telescopic inner rod 803. Rack bars 808 fixedly connected to the piston 810 and meshed with the two gears 807 respectively extend into the sliding groove 16 and the slow - closing spring 802.

[0040] One end of the telescopic inner rod 803 away from the telescopic outer rod 801 is rotatably connected to the guide ring 3, and the guide ring 3 is fixedly connected to the surface of the guide rod 5. In addition, two rotating grooves 18 corresponding to the position of the telescopic inner rod 803 are formed in the guide ring 3. Rotating shafts 19 are fixedly connected to both opposite side walls of the rotating groove 18. The rotating shafts 19 penetrate and extend into the telescopic inner rod 803, and a sealing ring for preventing external fluid from entering the telescopic inner rod 803 is arranged between the rotating shafts 19 and the telescopic inner rod 803.

[0041] In addition, a strip-shaped through hole is formed in the side wall of the telescopic inner rod 803, and an elastic adjusting surface 811 is fixedly connected to the inner wall of the strip-shaped through hole, and the elastic adjusting surface 811 is located between the piston 810 and the guide ring 3.

[0042] See Figure 3 、 Figure 4 、 Figure 6 , a plurality of adjusting holes 20 are formed in the portion of the guide rod 5 between the sliding ring 701 and the guide ring 3, so that the external fluid can flow into the guide rod 5. The adjusting assembly 9 includes a connecting ring fixedly connected to the inner wall of the guide rod 5, a first adjusting airbag 901 is embedded in the connecting ring, and the connecting ring is located in the middle section of the first adjusting airbag 901.

[0043] The surface of the first adjusting airbag 901 is provided with compression folds, and both ends of the first adjusting airbag 901 are fixedly connected with a first connecting plate. In addition, one end of the first connecting plate away from the guide ring 3 of the first adjusting airbag 901 is fixedly connected with one end of a first adjusting spring 903, and the other end of the first adjusting spring 903 is fixedly connected with the inner wall of the end of the guide rod 5 away from the adjusting hole 20.

[0044] See Figure 4 , a first adjusting tube 905 is fixedly connected to the first adjusting airbag 901. The first adjusting tube 905 is a soft leather tube, and the first adjusting tube 905 sequentially penetrates through the connecting ring, the outer wall of the guide rod 5, and the valve flap 6 and extends between the buffer rubber 702 and the valve flap 6, so that the buffer airbag is communicated with the first adjusting airbag 901.

[0045] See Figure 3 、 Figure 4 、 Figure 6 , a second adjusting airbag 902 is fixedly connected to the end of the guide rod 5 away from the first adjusting spring 903, and the surface of the second adjusting airbag 902 is provided with compression folds. One end of the second adjusting airbag 902 close to the first adjusting airbag 901 is fixedly connected with a second connecting plate. One end of a second adjusting spring 904 is fixedly connected to the second connecting plate, and the other end of the second adjusting spring 904 is fixedly connected to the first connecting plate at the end of the first adjusting airbag 901 close to the adjusting hole 20.

[0046] See Figure 6 , a second adjusting tube 906 is fixedly connected to the second adjusting airbag 902, and the second adjusting tube 906 sequentially penetrates through the guide rod 5, the guide ring 3, and the rotating shaft 19 and then extends into the telescopic inner rod 803, so that the second adjusting airbag 902 is communicated with the inner cavity of the telescopic inner rod 803 in the direction of the piston 810 close to the guide rod 5.

[0047] The implementation principle of Embodiment 2 of this application is as follows: After the check valve is installed, the fluid flows into the check valve from the end of the valve seat 2. The initially flowing fluid has a high velocity and impacts the surface of the buffer rubber 702, and pushes the buffer rubber 702 to move closer to the valve flap 6. During this process, under the action of the impact-resistant spring 703, the buffer rubber 702 first quickly approaches the valve flap 6 to reduce the impact force of the fluid, and then slowly approaches the valve flap 6. At the same time, the gas in the buffer airbag gradually flows into the first adjustment airbag 901, causing the first adjustment airbag 901 to expand on both sides of the connecting ring, thereby compensating for the volume inside the valve after the buffer airbag deflates.

[0048] At the same time, the first adjustment spring 903 and the second adjustment spring 904 deform and contract. Among them, the first adjustment spring 903 abuts against the first adjustment airbag 901, and the second adjustment spring 904 abuts against the second adjustment airbag 902 and compresses the second adjustment airbag 902. Part of the gas in the second adjustment airbag 902 flows into the telescopic inner rod 803, causing the elastic adjustment surface 811 to expand outward from the telescopic inner rod 803, thereby compensating for the volume lost by the second adjustment airbag 902.

[0049] In addition, as the fluid continuously impacts the buffer rubber 702 and abuts against the arc surface of the valve flap 6, and pushes the valve flap 6 to slide toward the flow guide sleeve 4. During this process, under the action of the slow-closing spring 802, the telescopic inner rod 803 moves toward the bottom of the sliding groove 16 and causes the gear 807 to rotate, and then drives the piston 810 to slide toward the bottom of the sliding groove 16, thereby further evacuating the gas in the second adjustment airbag 902, and then pulling the first adjustment airbag 901 to expand through the second adjustment spring 904 to compensate for the volume after the buffer airbag further deflates.

[0050] After the valve flap 6 abuts against the flow guide sleeve 4, the fluid flows past both sides of the valve flap 6, and at this time the fluid continuously squeezes the buffer rubber 702 and the valve flap 6, thereby making the overall structure stable. When the fluid stops flowing, the return spring 14 pushes the valve flap 6 toward the valve seat 2. At the same time, the slow-closing spring 802 pushes the telescopic inner rod 803 to slide away from the sliding groove 16, and then the piston 810 injects the gas in the telescopic inner rod 803 into the second adjustment airbag 902.

[0051] After the second adjustment airbag 902 expands, it squeezes the first adjustment airbag 901 through the second adjustment spring 904. In addition, after the buffer rubber 702 is not impacted by the fluid, the first adjustment spring 903 can squeeze the first adjustment airbag 901 to compress the first adjustment airbag 901, thereby causing the gas in the first adjustment airbag 901 to flow into the buffer airbag.

[0052] In addition, during the movement of the valve flap 6, the deformation of the slow-closing spring 802 applies a tensile force to the telescopic inner rod 803, thereby slowing down the closing speed of the valve flap 6. Moreover, when the valve flap 6 abuts against the valve seat 2, the buffer airbag first abuts against the valve seat 2, thereby preventing damage to the valve flap 6 when it abuts against the valve seat 2. When the gas in the part of the buffer airbag that abuts against the valve seat 2 is emptied, the valve flap 6 closes.

[0053] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An axial flow check valve, comprising a valve body (1), a valve seat (2), a valve disc (6) and a guide rod (5), wherein a guide sleeve (4) is arranged in the valve body (1), a guide frame is arranged in the guide sleeve (4), and a guide ring (3) is arranged in the valve seat (2), wherein the guide rod (5) axially penetrates the guide ring (3) and the guide frame respectively, wherein the valve disc (6) is axially sleeved on the guide rod (5), and a return spring (14) is sleeved on the guide rod (5), and the two ends of the return spring (14) are respectively in contact with the guide frame and the valve disc (6), and characterized in that: Also includes The anti-impact component (7) comprises a buffer rubber (702) arranged on the valve disc (6), wherein the guide rod (5) axially penetrates the buffer rubber (702), and an inert gas is injected between the buffer rubber (702) and the valve disc (6); The slow closing assembly (8) comprises a telescopic outer rod (801) rotatably connected to the valve seat (2), a sliding groove (16) is provided in the telescopic outer rod (801), a slow closing spring (802) is provided at the bottom of the sliding groove (16), a telescopic inner rod (803) is provided on the slow closing spring (802), and the telescopic inner rod (803) is rotatably connected to the guide ring (3); An adjusting component (9), wherein the adjusting component (9) is used to balance the water pressure in the valve.

2. An axial flow check valve according to claim 1, characterized in that: The anti-impact component (7) further comprises a sliding ring (701) axially sleeved on the guide rod (5), the sliding ring (701) sliding along the surface of the guide rod (5), and the side of the sliding ring (701) facing away from the guide rod (5) is connected to the buffer rubber (702).

3. An axial flow check valve according to claim 2, characterized in that: The guide rod (5) is axially sleeved with an anti-impact spring (703), one end of the anti-impact spring (703) abuts against the sliding ring (701), and the other end of the anti-impact spring (703) abuts against the valve flap (6).

4. An axial flow check valve according to claim 3, characterized in that: The valve flap (6) is provided with a buffer groove (15), the anti-impact spring (703) extends into the buffer groove (15), and the sliding ring (701) extends into the buffer groove (15) and abuts against the side wall of the buffer groove (15).

5. The axial flow check valve according to claim 1, characterized in that: The guide rod (5) is provided with a plurality of adjustment holes (20) between the sliding ring (701) and the guide ring (3); the adjustment assembly (9) comprises a first adjustment airbag (901) arranged in the guide rod (5); and the first adjustment airbag (901) is provided with a first adjustment tube (905) extending between the buffer rubber (702) and the valve flap (6).

6. An axial flow check valve according to claim 5, characterized in that: A first adjustment spring (903) is arranged inside the guide rod (5), one end of the first adjustment spring (903) is connected to a side of the first adjustment airbag (901) away from the adjustment hole (20), and the other end of the first adjustment spring (903) is connected to the inner wall of the guide rod (5).

7. An axial flow check valve according to claim 6, characterized in that: One end of the first regulating airbag (901) away from the first regulating spring (903) is provided with one end of the second regulating spring (904), and the other end of the second regulating spring (904) is provided with a second regulating airbag (902). One end of the second regulating airbag (902) away from the second regulating spring (904) is connected to the inner wall of the guide rod (5), and the second regulating airbag (902) is provided with a second regulating tube (906) extending into the telescopic inner rod (803).

8. An axial flow check valve according to claim 7, characterized in that: The guide ring (3) is provided with a rotation groove (18), the inner wall of the rotation groove (18) is provided with a rotation shaft (19), the rotation shaft (19) extends into the telescopic inner rod (803), and the second adjustment tube (906) is arranged in the rotation shaft (19), and the surface of the telescopic inner rod (803) is provided with a plurality of elastic adjustment surfaces (811).

9. An axial flow check valve according to claim 8, characterized in that: A piston (810) is slidably connected inside the telescopic inner rod (803), and a rack (808) is provided on the piston (810) and extends into the telescopic outer rod (801). One end of the telescopic inner rod (803) inside the telescopic outer rod (801) is rotatably connected to a gear (807) meshing with the rack (808), and a tooth groove (809) meshing with the gear (807) is provided on the inner wall of the telescopic outer rod (801).

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