Axial-flow type check valve

Abstract

According to the technical scheme, the axial-flow type check valve is characterized in that the axial-flow type check valve comprises a valve body, a valve seat, a valve clack and a driving assembly, the driving assembly is used for driving the valve clack to move in the direction of the valve seat, a liquid inlet port and a liquid outlet port are formed in the valve body, a filter plate is arranged at the liquid outlet port, and the driving assembly comprises a mounting seat, a guide rod and a driving spring; the mounting seat is mounted in the valve body, the valve clack is slidably connected to the guide rod, a transmission frame is rotationally connected to the mounting seat, a transmission groove is formed in the transmission frame, a transmission rod is arranged at the end, facing the mounting seat, of the valve clack, one end of the transmission rod is connected into the transmission groove, and when the valve clack moves towards the mounting seat, the transmission rod pushes the transmission frame to rotate; an adjusting disc is arranged on the side, facing the mounting base, of the filter plate, multiple sets of adjusting plates are movably connected to the adjusting disc, the adjusting disc is connected with the transmission frame, the check valve can adjust the outflow state according to the medium inflow condition, and therefore kinetic energy balance of a flow channel in the valve body is guaranteed.

Description

Technical Field

[0001] This invention relates to a check valve, and more specifically, to an axial flow check valve. Background Technology

[0002] Axial flow check valves not only possess the basic functions of general check valves, but are also the preferred valves for oil and gas gathering and transmission pipeline systems both domestically and internationally, especially at the outlet of oil pumps. Normally, when the valve disc of an axial flow check valve is fully open, it is limited and fixed by the valve body support.

[0003] In its initial state, the valve disc, used to block the flow path between the two pipes, is tightly fitted against the opening of the passage under the force of the spring, effectively isolating the fluid passage between the two pipes. In practical applications, it can be observed that the axial flow check valve uses the pressure of the liquid to push the valve disc to move. During this process, the spring is compressed, thereby achieving the function of guiding the fluid.

[0004] The axial flow check valve currently in use, when playing a role in preventing backflow, requires its valve core to complete a dynamic opening and closing action. At the moment the valve core comes into contact with the fluid, if the medium inside the valve body cannot be discharged quickly, the backflowing liquid will continuously counteract the fluid inside the valve body, thereby shortening the service life of the valve components.

[0005] Furthermore, during liquid backflow, if the fluid flow rate is high, a water hammer effect will occur on the valve body wall. This effect will put significant pressure on the valve body and valve core, and over time, the valve body's sealing performance can easily be damaged. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide an axial flow check valve that can adjust the outflow state according to the inflow of the medium, thereby ensuring the kinetic energy balance of the internal flow channel of the valve body.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an axial flow check valve, comprising a valve body, a valve seat, a valve disc, and a drive assembly, wherein the drive assembly is used to drive the valve disc to move toward the valve seat, the valve body is provided with an inlet port and an outlet port, the inlet port, the outlet port, the valve seat, the valve disc, and the center of the drive assembly are located on the same horizontal plane, and a filter plate is provided at the outlet port, wherein the filter plate is provided with a plurality of outlet holes; The drive assembly includes a mounting base, a guide rod, and a drive spring. The mounting base is installed in the valve body, the valve disc is slidably connected to the guide rod, and the drive spring is disposed between the mounting base and the valve disc. A transmission frame is rotatably connected to the mounting base. A transmission groove is provided on the transmission frame. A transmission rod is provided at the end of the valve disc facing the mounting base. One end of the transmission rod is connected to the transmission groove. When the valve disc moves toward the mounting base, the transmission rod pushes the transmission frame to rotate. An adjustment plate is provided on the side of the filter plate facing the mounting base. Multiple sets of adjustment plates are movably connected to the adjustment plate. The adjustment plate is connected to the transmission frame. When the transmission frame rotates, the adjustment plates change synchronously.

[0008] The present invention is further configured such that: the regulating plate includes multiple sets of regulating arms, a liquid-passing area is formed between two adjacent regulating arms, and each regulating arm is provided with an regulating groove; The adjusting plate includes a fixed base, an adjusting base, and a guide plate. The adjusting base is slidably connected to the fixed base, and the guide plate is installed on the adjusting plate. When the adjusting plate rotates, the adjusting plate slides along the length direction of the fixed base.

[0009] The present invention is further configured such that: the guide plate is provided with an orientation adjustment structure, and the fixed seat is provided with a linkage structure, wherein when the adjustment seat slides along the sliding groove, the linkage structure and the orientation adjustment structure work together in linkage.

[0010] The invention is further configured such that: the guide plate includes a plate body and a rod body; one end of the rod body is rotatably connected to an adjusting seat, and the other end is connected to the plate body; the orientation adjustment structure is a transmission gear disposed on the rod body; the fixed seat is provided with a sliding groove; the linkage structure is a linkage rack disposed on the inner wall of the sliding groove; the linkage rack is meshed with the transmission gear; and the rod body rotates as the adjusting seat slides along the sliding groove.

[0011] The present invention is further configured such that: the guide plate is hinged to the upper end of the adjustment seat, and an angle adjustment structure is provided between the guide plate and the adjustment seat; The fixed base is provided with a transmission structure, which is linked to the angle adjustment structure.

[0012] The present invention is further configured such that: the angle adjustment structure includes an adjustment shaft, an adjustment worm gear, an adjustment worm, and an adjustment gear; a connecting part is provided inside the adjustment seat; and one end of the guide plate is connected to the connecting part through the adjustment shaft. The adjusting worm gear is fixedly installed at one end of the adjusting shaft and connected to the adjusting worm. The adjusting gear is installed at one end of the adjusting worm, and one side of the adjusting gear extends out of the adjusting seat and is linked with the transmission structure.

[0013] The present invention is further configured such that: the transmission structure includes a transmission rack disposed on the fixed seat, and the transmission rack is meshed with an adjustment gear.

[0014] The present invention is further configured such that: the angle adjustment structure includes a sliding rod and a pushing arm. The sliding rod is slidably connected up and down within the adjustment seat. The pushing arm is disposed at the upper end of the sliding rod, and the upper end of the pushing arm is connected to the guiding plate. The transmission structure includes a guiding groove disposed on the fixed seat. A guiding surface is provided within the guiding groove, and the lower end surface of the sliding rod abuts against the guiding surface.

[0015] The present invention is further configured such that: the radial dimension of the transmission frame is smaller than the radial dimension of the valve flap. The transmission frame is sleeved outside the driving spring, and the transmission groove is provided on the outer wall of the transmission frame. The transmission groove includes a straight groove and an arc groove. The arc groove is connected to the end position of the straight groove. When the transmission rod slides along the arc groove, the transmission frame rotates.

[0016] The present invention is further configured such that: a transmission portion having a "C" - shaped structure is provided in the middle of the transmission frame. Through - grooves for the transmission portion to pass through are symmetrically formed on the mounting seat. A sealing groove, a sealing plate, and a sealing spring are provided inside the transmission portion. The sealing plate is slidably connected within the sealing groove through the sealing spring, and the sealing plate is in sealing abutment with the groove wall of the through - groove.

[0017] In summary, the present invention has the following beneficial effects: 1. When the liquid flow rate is moderate and the valve flap is in a semi - open state, the position of the adjustment plate does not change at this time. The adjustment plate guides the liquid with a moderate flow rate, preventing the liquid from overly impacting the periphery of the filter plate, balancing the water pressure impact, and increasing the service life.

[0018] 2. When the flow rate is large and the valve flap is in a fully - open state, the position of the adjustment plate is inward at this time. Multiple adjustment plates form a vortex - like shape. The vortex structure can guide the water flow to smoothly transition to the filter plate, reducing turbulence and local resistance.

[0019] The vortex structure makes the water flow form a spiral motion, using centrifugal force to throw denser impurities (such as sediment and particulate matter) towards the inner wall of the pipeline, reducing the probability of their direct impact on the filter plate. This reduces the risk of blockage of the filter plate, extending the cleaning cycle and service life.

[0020] 3. When the flow rate decreases and the valve flap transforms from the fully - open state to the closed state, the position of the adjustment plate is reset at this time, guiding the liquid flowing in the reverse direction to flow to the four sides, making the liquid in the middle flow towards the periphery, capable of reducing the pressure peak and suppressing the water hammer impact.

[0021] Water hammer is essentially the superposition of pressure waves caused by fluid inertia. By using a diversion structure to disperse the backflowing water from the center to the periphery, local velocity abrupt changes can be reduced, and the intense reflection and superposition of pressure waves within the pipe can be avoided.

[0022] By transforming the water flow from a single-point impact to a multi-directional dispersion, the impact on the drive components is reduced. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the original axial flow check valve. Figure 2 This is a schematic diagram of an axial flow check valve. Figure 3 A three-dimensional structural diagram of the transmission frame and adjusting disc; Figure 4 A sectional view showing the location of the transmission unit; Figure 5 This is a schematic diagram of the three-dimensional structure of the adjustment disc; Figure 6 This is a schematic diagram of the three-dimensional structure of the adjustment plate; Figure 7 This is a three-dimensional structural diagram of the orientation adjustment structure and the linkage structure; Figure 8 A three-dimensional structural diagram of the angle adjustment structure and the transmission structure; Figure 9 This is a three-dimensional structural diagram of the angle adjustment structure; Figure 10 This is a structural diagram showing the location of the guide groove; Figure 11 This is a schematic diagram of the state in Example 1.

[0024] Reference numerals: 1. Valve body; 11. Valve seat; 12. Valve disc; 13. Inlet port; 14. Outlet port; 2. Drive assembly; 21. Mounting base; 22. Guide rod; 23. Drive spring; 24. Through groove; 3. Filter plate; 31. Outlet hole; 4. Transmission frame; 41. Transmission groove; 42. Transmission part; 43. Sealing groove; 44. Sealing plate; 45. Sealing spring; 5. Transmission rod; 6. Adjusting disc; 61. Adjusting arm; 62. Liquid flow area; 63. Adjusting groove; 7. Adjusting plate; 71. Fixed seat; 711. Sliding groove; 72. Adjusting seat; 73. Guide plate; 731. Plate body; 732. Rod body; 8. Orientation adjustment structure; 81. Transmission gear; 82. Angle adjustment structure; 83. Adjusting shaft; 84. Adjusting worm gear; 85. Adjusting worm; 86. Adjusting gear; 87. Sliding rod; 88. Push arm; 9. Linkage structure; 91. Linkage rack; 92. Transmission structure; 93. Transmission rack; 94. Guide groove; 95. Guide surface. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Reference Figures 1 to 11 As shown, where Figure 1 As an existing axial flow check valve, when liquid enters from the inlet port 13 on the left, the valve disc 12 moves to the right and compresses the drive spring 23, and the liquid flows out from the outlet port 14 on the right. When the liquid pressure decreases, the valve disc 12 resets under the action of the drive spring 23, cutting off the liquid flow.

[0027] To achieve the above objectives, the present invention provides the following technical solution: an axial flow check valve, comprising a valve body 1, a valve seat 11, a valve disc 12, and a drive assembly 2. The drive assembly 2 is used to drive the valve disc 12 to move toward the valve seat 11. The valve body 1 is provided with an inlet port 13 and an outlet port 14. The centers of the inlet port 13, the outlet port 14, the valve seat 11, the valve disc 12, and the drive assembly 2 are located on the same horizontal plane. A filter plate 3 is provided at the outlet port 14, and a plurality of outlet holes 31 are provided on the filter plate 3. The drive assembly 2 includes a mounting base 21, a guide rod 22, and a drive spring 23. The mounting base 21 is installed inside the valve body 1, the valve disc 12 is slidably connected to the guide rod 22, and the drive spring 23 is disposed between the mounting base 21 and the valve disc 12. A transmission frame 4 is rotatably connected to the mounting base 21. A transmission groove 41 is provided on the transmission frame 4. A transmission rod 5 is provided at one end of the valve disc 12 facing the mounting base 21. One end of the transmission rod 5 is connected to the transmission groove 41. When the valve disc 12 moves toward the mounting base 21, the transmission rod 5 pushes the transmission frame 4 to rotate. An adjustment plate 6 is provided on the side of the filter plate 3 facing the mounting base 21. Multiple sets of adjustment plates 7 are movably connected to the adjustment plate 6. The adjustment plate 6 is connected to the transmission frame 4 (fixed connection). When the transmission frame 4 rotates, the adjustment plates 7 change synchronously.

[0028] In this invention, since the regulating disc 6 is provided with multiple sets of regulating plates 7, when the valve disc 12 changes from the closed state to the open state, the transmission rod 5 slides along the extension direction of the transmission groove 41, causing the transmission frame 4 and the regulating disc 6 to rotate, thereby changing the relative position of the regulating plates 7 to meet various needs.

[0029] The specific operation is as follows: the adjustment plate 7 is initially in the outward unfolded state.

[0030] To meet the needs of the following situations: 1. When the liquid flow rate is moderate, the valve disc 12 is in a half-open state. At this time, the position of the regulating plate 7 does not change. The regulating plate 7 guides the liquid with moderate flow rate, preventing the liquid from excessively impacting the periphery of the filter plate 3, balancing the water pressure impact, and improving service life.

[0031] 2. When the flow rate is large, the valve disc 12 is fully open. At this time, the position of the regulating plate 7 is inward, and multiple regulating plates 7 form a vortex. The vortex structure can guide the water flow to smoothly transition to the filter plate 3, reducing turbulence and local resistance.

[0032] The vortex structure causes the water flow to spiral, using centrifugal force to throw denser impurities (such as silt and particulate matter) toward the inner wall of the pipe, reducing the probability of them directly impacting the filter plate 3. This reduces the risk of clogging the filter plate 3 and extends the cleaning cycle and service life.

[0033] 3. When the flow rate decreases, the valve disc 12 changes from the fully open state to the closed state. At this time, the position of the regulating plate 7 is reset, which guides the reverse-flowing liquid to the four sides, so that the liquid in the middle flows to the periphery, which can reduce the pressure peak and suppress water hammer impact.

[0034] Water hammer is essentially the superposition of pressure waves caused by fluid inertia. By using a diversion structure to disperse the backflowing water from the center to the periphery, local velocity abrupt changes can be reduced, and the intense reflection and superposition of pressure waves within the pipe can be avoided.

[0035] The water flow is transformed from a single-point impact to a multi-directional dispersion, reducing the impact on the drive component 2.

[0036] like Figure 5 As shown, when the adjustment disc 6 is provided, the filter plate 3 has a corresponding slot at the position of the adjustment disc 6, and the adjustment disc 6 replaces the function of this part of the filter structure.

[0037] Furthermore, the filter plate 3 can be replaced by the adjustment disc 6.

[0038] The present invention is further configured such that: the regulating plate 6 includes multiple sets of regulating arms 61, and a liquid-passing area 62 is formed between two adjacent regulating arms 61, and each regulating arm 61 is provided with an regulating groove 63; the design of the liquid-passing area 62 facilitates the flow of liquid.

[0039] The adjusting plate 7 includes a fixed base 71, an adjusting base 72, and a guide plate 73. The adjusting base 72 is slidably connected to the fixed base 71, and the guide plate 73 is installed on the adjusting plate 7. When the adjusting plate 6 rotates, the adjusting plate 7 slides along the length of the fixed base 71.

[0040] like Figure 3 and Figure 4As shown, the transmission frame 4 is directly connected to the adjustment plate 6. When the transmission frame 4 rotates, it drives the adjustment plate 6 to rotate, which in turn causes the guide plate 73 to change in a linked manner.

[0041] Example 1: The guide plate 73 is provided with an orientation adjustment structure 8, and the fixed seat 71 is provided with a linkage structure 9. When the adjustment seat 72 slides along the sliding groove 711, the linkage structure 9 and the orientation adjustment structure 8 work together in linkage.

[0042] The present invention is further configured such that: the guide plate 73 includes a plate body 731 and a rod body 732, one end of the rod body 732 is rotatably connected to the adjusting seat 72, and the other end is connected to the plate body 731; the adjusting structure 8 is a transmission gear 81 disposed on the rod body 732; the fixed seat 71 is provided with a sliding groove 711; the linkage structure 9 is a linkage rack 91 disposed on the inner wall of the sliding groove 711; the linkage rack 91 is meshed with the transmission gear 81; when the adjusting seat 72 slides along the sliding groove 711, the rod body 732 rotates.

[0043] like Figure 7 and Figure 11 As shown, in this first embodiment, when the adjusting disc 6 rotates, the adjusting seat 72 can slide along the sliding groove 711. At this time, the transmission gear 81 at the position of the rod 732 will mesh with the linkage rack 91 on the inner wall of the sliding groove 711 and rotate, so that the rod 732 rotates while moving.

[0044] This changes the orientation of the plate body 731. The design of this structure increases the adjustable range of the adjusting plate 7 within the limited rotation range of the transmission frame 4, thereby increasing the effect that the adjusting plate 7 can achieve when the flow rate is too high and when there is a water hammer.

[0045] When water forms a vortex, the law of conservation of angular momentum (L=mvr) and the pressure gradient force (∇p=ρ⋅rv²) work together to cause the water to contract towards the center and accelerate its rotation. When the vortex walls are close together, the radius of rotation of the water decreases and the tangential velocity (v) increases, thus creating a low-pressure zone at the center of the vortex, attracting surrounding water to accelerate into it. Therefore, when the flow rate is too high, increasing the rotation angle of the multiple regulating plates 7 brings them closer together, thereby improving the drainage effect.

[0046] When it acts as a water hammer protector, it causes the adjusting plate 7 to move outward, increasing the guiding range of the central area.

[0047] Example 2 (Examples 1 and 2 are unrelated): The guide plate 73 is hinged to the upper end of the adjustment seat 72, and an angle adjustment structure 82 is provided between the guide plate 73 and the adjustment seat 72; A transmission structure 92 is provided on the fixed base 71, and the transmission structure 92 is linked with the angle adjustment structure 82.

[0048] The present invention is further configured such that: the angle adjustment structure 82 includes an adjustment shaft 83, an adjustment worm wheel 84, an adjustment worm 85 and an adjustment gear 86, and the adjustment seat 72 is provided with a connecting part, and one end of the guide plate 73 is connected to the connecting part through the adjustment shaft 83; The adjusting worm gear 84 is fixedly installed at one end of the adjusting shaft 83 and connected to the adjusting worm 85; The adjusting gear 86 is installed at one end of the adjusting worm 85, and one side of the adjusting gear 86 extends out of the adjusting seat 72 and is linked with the transmission structure 92.

[0049] The transmission structure 92 includes a transmission rack 93 disposed on the fixed base 71, and the transmission rack 93 is meshed with the adjusting gear 86.

[0050] like Figure 8 and Figure 9 As shown, in this structure, when the adjusting seat 72 slides along the sliding groove 711, the adjusting gear 86 meshes with the transmission rack 93, causing the adjusting gear 86 and the adjusting worm 85 to rotate synchronously.

[0051] Since the adjusting worm 85 is engaged with the adjusting worm wheel 84, it drives the adjusting worm wheel 84 and the adjusting shaft 83 to rotate.

[0052] At this point, the angle of the guide plate 73 is changed. Specifically, when the flow rate increases and the transmission frame 4 rotates, the angle adjustment structure 82 causes the guide plate 73 to buckle inward. When the flow rate decreases and the transmission frame 4 resets, the angle adjustment structure causes the guide plate 73 to flip outward.

[0053] When the guide plate 73 is tilted inward, it improves the drainage effect. As the water flows along the inclined surface, it generates a normal component (a force perpendicular to the wall) and a tangential component (a force along the wall). The tangential component accelerates the water flow's rotation, increasing the tangential velocity (vθ) of the vortex, while the normal component compresses the radial space of the water flow, further reducing the radius of rotation (r). According to the law of conservation of angular momentum (L=mvr=constant), with a constant mass (m), vθ is inversely proportional to r. Therefore, the inward tilt of the guide plate 73 increases vθ by reducing r, thereby enhancing the vortex's suction capacity and accelerating drainage.

[0054] When the guide plate 73 flips outward, it effectively guides the liquid in the center to flow to the periphery.

[0055] Example 3: The present invention is further configured such that: the angle adjustment structure 82 includes a sliding rod 87 and a pushing arm 88, the sliding rod 87 slides up and down and is connected to the adjustment seat 72, the pushing arm 88 is disposed at the upper end of the sliding rod 87, and the upper end of the pushing arm 88 is connected to the guide plate 73; The transmission structure 92 includes a guiding groove 94 provided on the fixed seat 71. A guiding surface 95 is provided in the guiding groove 94, and the lower end surface of the sliding rod 87 is in contact with the guiding surface 95.

[0056] Embodiment III can be based on Embodiment I. As Figure 10 shown, when the adjusting seat 72 slides along the sliding groove 711, the sliding rod 87 abuts against the guiding surface 95, thereby changing the vertical position of the sliding plate. At this time, the angle of the guiding plate 73 is changed through the pushing arm 88, so that the guiding plate 73 is buckled and flipped inward. Therefore, while changing the facing direction, the angle of the guiding plate 73 is changed, realizing the superposition of the structural effects. The specific effects are as shown above and will not be elaborated here.

[0057] The present invention is further configured that: the radial length dimension of the transmission frame 4 is smaller than the radial length dimension of the valve flap 12. The transmission frame 4 is sleeved outside the driving spring 23, and the transmission groove 41 is provided on the outer wall of the transmission frame 4; With this structural design, the structure of the transmission frame 4 can be hidden behind the valve flap 12. When the valve flap 12 is opened, the liquid will not directly impact the transmission frame 4, ensuring that the transmission frame 4 has a long service life.

[0058] The transmission groove 41 includes a straight groove and an arc groove. The arc groove is connected to the end position of the straight groove. When the transmission rod 5 slides along the arc groove, the transmission frame 4 rotates.

[0059] With this structural design, the adjusting plate 7 and the adjusting disc 6 have different functions in various opening states of the valve flap 12.

[0060] Specifically, taking the half-open and fully-open states of the valve flap 12 as an example, when the valve flap 12 is in the half-open state, the transmission rod 5 only moves along the straight groove part, and at this time, the transmission frame 4 does not rotate.

[0061] When the valve flap 12 is switched from the half-open state to the fully-open state, the transmission rod 5 slides along the arc groove, and at this time, it can push the transmission frame 4 to rotate, thereby effectively distinguishing different states.

[0062] The present invention is further configured that: a transmission part 42 with a "C" - shaped structure is provided in the middle of the transmission frame 4. Through grooves 24 for the transmission part 42 to pass through are symmetrically opened on the mounting seat 21. A sealing groove 43, a sealing plate 44 and a sealing spring 45 are provided inside the transmission part 42. The sealing plate 44 is slidably connected to the sealing groove 43 through the sealing spring 45, and the sealing plate 44 is in sealing contact with the groove wall of the through groove 24.

[0063] The design of this structure, by placing the transmission frame 4 inside the mounting base 21, effectively protects the transmission frame 4, but it also raises the issue of the connection between the transmission frame 4 and the adjustment plate 6. Therefore, a through slot 24 is opened on the mounting base 21 for the transmission part 42 to pass through.

[0064] Furthermore, to ensure the stability of the mounting base 21 itself, a portion of the mounting base 21 is connected to the inner wall of the valve body 1.

[0065] Furthermore, through the design of the sealing plate 44, a certain effective sealing effect is maintained between the transmission frame 4 and the mounting base 21. At this time, the following effects can be obtained: the transmission frame 4 covers the outside of the drive spring 23, and one end of the transmission frame 4 will form a cylindrical body with a one-way opening. This part can effectively protect the drive spring 23 and prevent impurities in the liquid from affecting the service life of the drive spring 23.

[0066] Furthermore, since the transmission frame 4 can rotate during the opening and closing of the valve disc 12, the liquid overflowing into the transmission frame 4 can be discharged during the rotation of the transmission frame 4.

[0067] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An axial flow check valve, comprising a valve body (1), a valve seat (11), a valve disc (12), and a drive assembly (2), wherein the drive assembly (2) is used to drive the valve disc (12) to move toward the valve seat (11), the valve body (1) is provided with an inlet port (13) and an outlet port (14), and the centers of the inlet port (13), the outlet port (14), the valve seat (11), the valve disc (12), and the drive assembly (2) are located on the same horizontal plane, characterized in that: A filter plate (3) is provided at the liquid outlet port (14), and a plurality of liquid outlet holes (31) are provided on the filter plate (3); The drive assembly (2) includes a mounting base (21), a guide rod (22) and a drive spring (23). The mounting base (21) is installed inside the valve body (1). The valve disc (12) is slidably connected to the guide rod (22), and the drive spring (23) is disposed between the mounting base (21) and the valve disc (12). A transmission frame (4) is rotatably connected to the mounting base (21). A transmission groove (41) is provided on the transmission frame (4). A transmission rod (5) is provided at one end of the valve disc (12) facing the mounting base (21). One end of the transmission rod (5) is connected to the transmission groove (41). When the valve disc (12) moves toward the mounting base (21), the transmission rod (5) pushes the transmission frame (4) to rotate. The filter plate (3) is provided with an adjustment plate (6) on the side facing the mounting base (21). Multiple adjustment plates (7) are movably connected to the adjustment plate (6). The adjustment plate (6) is connected to the transmission frame (4). When the transmission frame (4) rotates, the adjustment plates (7) change synchronously.

2. The axial flow check valve according to claim 1, characterized in that: The regulating plate (6) includes multiple sets of regulating arms (61), and a liquid-filled area (62) is formed between two adjacent regulating arms (61). Each regulating arm (61) is provided with an regulating groove (63). The adjusting plate (7) includes a fixed seat (71), an adjusting seat (72), and a guide plate (73). The adjusting seat (72) is slidably connected to the fixed seat (71), and the guide plate (73) is installed on the adjusting plate (7). When the adjusting plate (6) rotates, the adjusting plate (7) slides along the length direction of the fixed seat (71).

3. An axial flow check valve according to claim 2, characterized in that: The guide plate (73) is provided with an orientation adjustment structure (8), and the fixed seat (71) is provided with a linkage structure (9). When the adjustment seat (72) slides along the sliding groove (711), the linkage structure (9) and the orientation adjustment structure (8) work together in linkage.

4. An axial flow check valve according to claim 3, characterized in that: The guide plate (73) includes a plate body (731) and a rod body (732). One end of the rod body (732) is rotatably connected to the adjusting seat (72), and the other end is connected to the plate body (731). The orientation adjustment structure (8) is a transmission gear (81) set on the rod body (732). The fixed seat (71) is provided with a sliding groove (711). The linkage structure (9) is a linkage rack (91) set on the inner wall of the sliding groove (711). The linkage rack (91) meshes with the transmission gear (81). When the adjusting seat (72) slides along the sliding groove (711), the rod body (732) rotates.

5. An axial flow check valve according to claim 2, characterized in that: The guide plate (73) is hinged to the upper end of the adjusting seat (72), and an angle adjusting structure (82) is provided between the guide plate (73) and the adjusting seat (72); The fixed base (71) is provided with a transmission structure (92), which is linked with the angle adjustment structure (82).

6. An axial flow check valve according to claim 5, characterized in that: The angle adjustment structure (82) includes an adjustment shaft (83), an adjustment worm gear (84), an adjustment worm (85), and an adjustment gear (86). A connection part is provided in the adjustment seat (72), and one end of the guide plate (73) is connected to the connection part through the adjustment shaft (83). The adjustment worm gear (84) is fixedly installed at one end of the adjustment shaft (83) and is connected to the adjustment worm (85). The adjustment gear (86) is installed at one end of the adjustment worm (85), and one side of the adjustment gear (86) extends out of the adjustment seat (72) and is linked with the transmission structure (92).

7. An axial flow check valve according to claim 6, characterized in that: The transmission structure (92) includes a transmission rack (93) provided on the fixed seat (71), and the transmission rack (93) is meshed with the adjustment gear (86).

8. An axial flow check valve according to claim 5, characterized in that: The angle adjustment structure (82) includes a sliding rod (87) and a pushing arm (88). The sliding rod (87) is connected to slide up and down in the adjustment seat (72). The pushing arm (88) is provided at the upper end of the sliding rod (87), and the upper end of the pushing arm (88) is connected to the guide plate (73). The transmission structure (92) includes a guide groove (94) provided on the fixed seat (71). A guide surface (95) is provided in the guide groove (94), and the lower end surface of the sliding rod (87) is in contact with the guide surface (95).

9. An axial flow check valve according to any one of claims 1-8, characterized in that: The radial length dimension of the transmission frame (4) is smaller than the radial length dimension of the valve flap (12). The transmission frame (4) is sleeved on the outer side of the driving spring (23), and the transmission groove (41) is provided on the outer wall of the transmission frame (4). The transmission groove (41) includes a straight groove and an arc groove. The arc groove is connected to the end position of the straight groove. When the transmission rod (5) slides along the arc groove, the transmission frame (4) rotates.

10. An axial flow check valve according to claim 9, characterized in that: A transmission part (42) with a "C" - shaped structure is provided in the middle of the transmission frame (4). Through - slots (24) for the transmission part (42) to pass through are symmetrically provided on the mounting seat (21). A sealing groove (43), a sealing plate (44), and a sealing spring (45) are provided inside the transmission part (42). The sealing plate (44) is connected to slide in the sealing groove (43) through the sealing spring (45), and the sealing plate (44) is in sealing contact with the groove wall of the through - slot (24).

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