A reverse anti-blocking check valve

Abstract

The present invention discloses a reverse anti-blocking check valve, which relates to the field of valve body technology and includes a check valve body, wherein an expansion component is provided on the valve plate surface facing the fluid direction of the check valve body; the expansion component includes: a bearing column fixed at the central axis of the valve plate surface, and a limit ring fixed at the axial top end. The present invention realizes a dynamic response function during the opening and closing of the valve by providing the expansion component on the flow-facing side of the valve plate. When the fluid impacts positively, the expansion component expands under the action of the fluid pressure, and the contact arc plate automatically adheres to the inner wall of the pipe to form an auxiliary sealing ring, effectively improving the sealing performance and reducing the leakage problem caused by poor sealing. When the fluid pressure weakens, the expansion component retracts with the help of a spring, causing the contact arc plate to separate from the inner wall of the pipe and generate relative motion, playing a cleaning role similar to that of a scraper, and can effectively peel off the attached dirt on the pipe wall and the surface of key structures, thereby improving the self-cleaning ability and anti-blocking effect of the valve.

Description

Technical Field

[0001] The present invention relates to the technical field of valve bodies, in particular to a reverse anti-blocking check valve. Background Art

[0002] A check valve is a one-way fluid control device commonly used in piping systems. Its primary function is to prevent backflow of media, ensuring system safety and stable operation. Traditional check valves often utilize a single or dual disc structure, relying on fluid pressure differentials to drive the discs open and close. However, over long-term operation, particularly when conveying industrial fluids containing solid particles, viscous substances, or impurities (such as sewage, slurry, and chemical raw materials), problems often arise: the disc becomes blocked from opening, sealing performance degrades, and even valves become stuck or fail due to dirt deposits.

[0003] After searching, the Chinese invention patent application with publication number "CN119790264A" proposes a "check valve", which opens and closes the inlet of the check valve by means of a piston movably arranged relative to the inlet and outlet, wherein the piston defines a piston axis by means of a first end facing the inlet and a second end facing the outlet, the piston has an outer surface, and the fluid flowing through the check valve in the flow direction flows along the outer surface, and the outlet has an outlet channel so that the fluid can flow outward from the check valve, wherein all outlet channels of the outlet extend obliquely relative to the piston axis, the check valve can be used for high pressure and can be softly closed even when the pressure effect is reversed, and the check valve is particularly used in hydrogen refueling stations.

[0004] In addition, the Chinese utility model patent application with publication number "CN221237225U" proposes "a check valve body structure". The micro motor starts, drives the rotating shaft to rotate, drives the pull rope to reel, and assists the smoke isolation valve plate to reset through the pull rope. When the elastic force of the torsion spring rotating shaft is not enough to drive the smoke isolation valve plate to reset, the smoke isolation valve plate is pulled into fit with the limit strip through the pull rope. At this time, the smoke isolation valve plate is reset into place, ensuring that the smoke isolation valve plate is reset into place to prevent smoke leakage and smoke backflow.

[0005] However, the above-mentioned disclosed device and similar existing devices, although they attempt to improve the sealing performance by providing elastic sealing gaskets, reinforced structural parts, etc. on the surface of the valve plate, these improvements mostly focus on structural strength or material selection, and lack a systematic design for the cleanliness and anti-blocking ability of the valve body. In addition, most traditional check valves adopt a static structure, and their valve plates only move axially during the opening and closing process, lacking effective dynamic auxiliary sealing and cleaning functions, resulting in the easy accumulation of impurities or sediments in the fluid in the sealing pair contact area. As time accumulates, a potential blockage hazard is formed, which in turn affects the flexibility of valve opening and closing and the flow efficiency. In terms of maintenance, these check valves are often not convenient for local cleaning and maintenance, especially under continuous operation conditions. If the inside of the valve body needs to be thoroughly cleaned, it is usually necessary to shut down and disassemble the valve, affecting the system operation efficiency and increasing maintenance costs. Summary of the Invention

[0006] The object of the present invention is to provide a reverse anti-blocking check valve to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a reverse anti-blocking check valve, comprising a check valve body, wherein an expansion component is provided on a valve plate surface of the check valve body facing the fluid direction;

[0008] The expansion component comprises:

[0009] The bearing column is fixed on the central axis of the valve plate surface, and a limit ring is fixed on the axial top end;

[0010] The sliding sleeve is mounted on the outside of the bearing column:

[0011] The umbrella rib deployment structure includes a plurality of umbrella rib supports composed of telescopic contact arms and linkage arms. One end of the telescopic contact arm is hinged to the surface of the movable sleeve, one end of the linkage arm is hinged to the bottom end of the axial surface of the bearing column, and the other end is hinged to the contact arc plate. The other end of the telescopic contact arm is hinged to the middle part of the linkage arm.

[0012] The spring is sleeved on the surface of the bearing column, with its two ends fixedly connected to the bottom of the limiting ring and the top of the movable sleeve respectively;

[0013] The contact valve plate is fixed to the outer periphery of the top of the movable sleeve and is used to withstand the impact of the fluid and push the movable sleeve to slide axially.

[0014] The technical solution is further preferred that the check valve body is provided with two valve plates, namely a first valve plate and a second valve plate, and a rebound member is fixed between the inner sides of the first valve plate and the second valve plate;

[0015] The check valve body also includes a valve body tube, a channel plate is fixed in the inner cavity of the valve body tube, the first valve plate and the second valve plate are respectively arranged at both ends of the channel plate in the axial direction, and the rebound member is inserted and installed at the central axis of the channel plate.

[0016] The present technical solution is further preferred in that the expansion component is installed in the following ways: being installed on the outer side surface of the first valve plate, being installed on the outer side surface of the second valve plate, and being installed on the outer side surfaces of both the first valve plate and the second valve plate.

[0017] In a further preferred embodiment of the present technical solution, the resilient member includes:

[0018] A sleeve is slidably connected to the channel plate;

[0019] Two elastic protrusions are respectively fixed at the pipe opening positions at both ends of the sleeve;

[0020] The movable opening is opened in the middle section of the casing surface and passes through the top and bottom of the casing surface;

[0021] The rack plate is fitted and fixed to the middle end of one side of the inner wall of the casing.

[0022] The technical solution is further preferred that a switching component vertically penetrates the central axis of the channel plate and is fixed inside the valve body tube, and the switching component is used to adjust the relative distance between the first valve plate and the second valve plate;

[0023] The switching component includes:

[0024] The rod sleeve is fixed inside the valve body tube and vertically penetrates the central axis of the channel plate;

[0025] The contact notch is provided at the same interface between the rod sleeve surface and the movable opening;

[0026] The switching rod is installed in the rod sleeve, and the bottom end is rotatably connected to the bottom of the rod sleeve;

[0027] The transmission gear is sleeved and fixed on the surface of the switching rod and at a position corresponding to the contact notch, and is adapted to the rack plate;

[0028] By rotating the switching rod, the transmission gear drives the rack plate to move axially, so that the sleeve moves axially as a whole, thereby adjusting the relative distance between the first valve plate and the second valve plate.

[0029] The technical solution is further preferred, wherein the valve plate includes:

[0030] The center axis of the inner cavity of the contact dish cover is fixed to the top of the elastic convex seat, and the center axis of the top of the contact dish cover surface is fixed to the axial bottom end of the bearing column;

[0031] The storage arc arm is provided with a number of blocks that match the number and position of the umbrella rib brackets and are respectively fixed to the edge of the top end of the contact dish cover surface.

[0032] The present technical solution is further preferred in that when the fluid impacts the valve plate, the movable sleeve compresses the spring and drives the umbrella rib expansion structure to expand radially, so that the outer surface of the contact arc plate fits the inner wall of the pipe;

[0033] When the fluid pressure decreases, the spring reset pushes the movable sleeve to retract, driving the contact arc plate to separate from the inner wall of the pipe. The relative movement between the outer surface of the contact arc plate and the inner wall of the pipe peels off the attached dirt.

[0034] The present technical solution is further preferred in that a dirt storage valve tube is installed at the bottom end of the inner wall of the pipeline, and the top opening of the dirt storage valve tube is located below the scraping track of the contact arc plate on the inner wall of the pipeline for receiving the stripped dirt.

[0035] The present technical solution is further preferred. When the fluid impacts the outer side surface of the first valve plate, the first valve plate contracts toward the channel plate and compresses the rebound part. The fluid impacts the inner side surface of the second valve plate through the channel plate, causing it to overcome the force of the rebound part and detach from the channel plate. When the fluid pressure decreases, the rebound part pushes the second valve plate and allows the second valve plate to return to its original position and fit the channel plate.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] This reverse anti-blocking check valve realizes a dynamic response function during the opening and closing process of the valve by arranging an expansion component on the flow-facing side of the valve disc. When the fluid impacts in the forward direction, the expansion component expands under the action of the fluid pressure, and the contact arc plate automatically adheres to the inner wall of the pipe to form an auxiliary sealing ring, which effectively improves the sealing performance and reduces the leakage problem caused by loose sealing. When the fluid pressure decreases, the expansion component retracts with the help of a spring, causing the contact arc plate to separate from the inner wall of the pipe and generate relative movement, playing a cleaning role similar to that of a scraper, which can effectively strip away the dirt attached to the pipe wall and the surface of key structures, thereby improving the self-cleaning ability and anti-blocking effect of the valve.

[0038] In addition, the dirt storage valve tube installed at the bottom of the valve body is cleverly designed. Its opening is directly below the scraping track of the contact arc plate, allowing the stripped dirt to fall into it. The removable bottom cover can be used for quick cleaning, and maintenance can be completed without shutting down the entire machine, which significantly improves the continuity of equipment operation and maintenance efficiency, and reduces operation and maintenance costs.

[0039] It should also be added that by introducing a double valve plate structure and a rebound part design, the valve can respond to changes in fluid pressure in stages during the opening and closing process, thereby improving the smoothness and reliability of the opening and closing action and avoiding structural damage caused by impurity impact or residual pressure difference. The introduction of the switching component realizes the adjustable distance between the first valve plate and the second valve plate, effectively responding to changes in fluid properties under different working conditions and enhancing the equipment's adaptability to high-viscosity and high-impurity fluids. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is an isometric view of the present invention;

[0041] Figure 2 It is a schematic cross-sectional view of the central axis direction of the present invention;

[0042] Figure 3 This is a schematic cross-sectional view of the center normal direction of the present invention;

[0043] Figure 4 This is an assembly diagram of the switching assembly of the present invention placed in the valve body tube;

[0044] Figure 5 for Figure 4 A partial enlarged view of part A;

[0045] Figure 6 This is a diagram of the bottom structure of the switching assembly of the present invention;

[0046] Figure 7 This is a structural diagram of the valve plate structure of the present invention;

[0047] Figure 8 This is a structural diagram of the expansion component of the present invention;

[0048] Figure 9 It is a schematic cross-sectional view of the central axis direction of the present invention when it is arranged in a tube body and is acted upon by a fluid.

[0049] In the figure: 1. Valve body tube; 2. Switching assembly; 201. Switching rod; 202. Elastic boss; 203. Rod sleeve; 204. Sleeve; 205. Transmission gear; 206. Rack plate; 207. Contact notch; 208. Movable opening; 3. Valve plate structure; 301. Contact dish cover; 302. Expansion component; 3021. Contact arc plate; 3022. Spring; 3023. Moving sleeve; 3024. Bearing column; 3025. Telescopic contact arm; 3026. Linkage arm; 303. Storage arc arm; 304. Contact valve plate; 4. Channel plate; 5. Sewage storage valve tube. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] Before understanding the technical solution proposed in this application, it should be clear that the core innovation of the reverse anti-blocking check valve proposed in this application is that a mechanical structure that can dynamically expand and contract is provided on the outer surface of the valve plate facing the direction of fluid flow - the expansion component 302. When the positive fluid impacts the valve plate, the expansion component 302 not only allows the fluid to push the valve plate to open, but its key components (such as the contact valve plate 304, the movable sleeve, and the umbrella rib expansion structure) will produce axial displacement and radial expansion movement under the action of fluid pressure. Specifically, the contact arc plate 3021 will expand outward and fit tightly against the inner wall of the pipe. This The fitting action has a dual function: first, when the valve is open, the expanded contact arc plate 3021 forms an auxiliary sealing ring with the inner wall of the pipe, which helps to improve the sealing effect; second, when the fluid pressure decreases and the valve needs to be closed, the expansion component 302 retracts under the action of the spring 3022, and the contact arc plate 3021 then separates from the inner wall of the pipe and shrinks toward the central axis. During this separation and contraction process, the outer surface of the contact arc plate 3021 and the inner wall of the pipe produce relative movement. This movement is like a scraper, which can effectively scrape off and peel off dirt attached to the inner wall of the pipe and near the key joints of the valve.

[0052] In addition, this solution also specially designs a sewage valve tube 5, the top opening of which is precisely located below the scraping trajectory of the contact arc plate 3021 on the inner wall of the pipe. In this way, the dirt scraped and peeled off can fall smoothly into the sewage valve tube 5 and be collected under the influence of gravity or the slight drive of the subsequent fluid, thereby preventing the dirt from re-attaching or accumulating in the working area of ​​the valve. The sewage valve tube 5 is usually provided with a detachable bottom cover, which is convenient for cleaning dirt without stopping the machine or for a short time, thereby greatly improving the convenience of maintenance.

[0053] It should also be noted that the operating principle of the preferred embodiment with dual valve plates (first and second valve plates) and a resilient element also reflects an extension of the anti-blocking design. When fluid impacts the outer side of the first valve plate, the first valve plate compresses the resilient element, moving it toward the channel plate 4 and opening it. The fluid then passes through the channel plate 4 and impacts the inner side of the second valve plate, overcoming the force of the resilient element and causing it to also open. When the fluid pressure decreases, the resilient element releases energy, first pushing the second valve plate back into contact with the channel plate 4 and closing it, then pushing the first valve plate back into contact and closing it. Finally, the valve plate structure 3 itself enhances sealing reliability. The design of the movable opening 208 built into the resilient element, as well as the ability to adjust the distance between the two valve plates via the switching assembly 2, further optimize the valve's adaptability to different operating conditions (e.g., fluids of varying viscosities and impurity contents) and its anti-blocking effectiveness. For example, appropriately increasing the distance between the two valve plates can reduce resistance to fluid flow and reduce the possibility of impurities becoming stuck in the narrow gap.

[0054] Specifically, if Figures 1-9 As shown, the present invention proposes a reverse anti-blocking check valve, including a check valve body, a valve plate of the body facing the fluid direction is provided with a valve plate structure 3, wherein the surface of the valve plate structure 3 is provided with an expansion component 302, and the expansion component 302 is designed to automatically expand and contract under the action of the fluid to enhance the anti-blocking effect.

[0055] As a preferred embodiment, refer to Figure 8 As can be seen, the expansion component 302 specifically includes: a bearing column 3024, the bearing column 3024 is fixed at the central axis of the valve plate surface, and a limit ring is welded to the axial top to provide stable support, a movable sleeve 3023, a sliding sleeve on the outside of the bearing column 3024, and moves along the axial direction, an umbrella rib expansion structure, and the umbrella rib expansion structure is composed of a plurality of umbrella rib brackets, each umbrella rib bracket includes a telescopic contact arm 3025 and a linkage arm 3026, one end of the telescopic contact arm 3025 is connected to the surface of the movable sleeve 3023 through a hinge point, and one end of the linkage arm 3026 is connected to the bearing The bottom end of the axial surface of the supporting column 3024 is hinged, and the other end is hinged to the contact arc plate 3021. At the same time, the other end of the telescopic contact arm 3025 is hinged to the middle part of the linkage arm 3026 to form a linkage mechanism, spring 3022, the spring 3022 is sleeved on the surface of the supporting column 3024, and the two ends of the spring 3022 are respectively fixedly connected to the bottom of the limit ring and the top of the movable sleeve 3023 to provide elastic reset force; and the contact valve plate 304, the contact valve plate 304 is fixed to the outer periphery of the top of the movable sleeve 3023, directly bearing the impact of the fluid and pushing the movable sleeve 3023 to slide axially.

[0056] As a preferred embodiment, in this embodiment, the valve plates of the check valve body are two independent components, namely the first valve plate and the second valve plate, and a rebound member is fixed between the inner sides of the two. The rebound member is used to provide buffering and reset functions when the fluid pressure changes. The check valve body also includes a valve body tube 1, and the inner cavity of the valve body tube 1 is fixed with a channel plate 4. The first valve plate and the second valve plate are respectively arranged at the two ends of the axial direction of the channel plate 4, and the rebound member is inserted and installed at the center axis of the channel plate 4 to ensure the stability of the overall structure. It should be added that the installation method of the expansion component 302 is flexible and diverse, including being arranged on the outer side of the first valve plate, being arranged on the outer side of the second valve plate, and being arranged on the outer sides of the first valve plate and the second valve plate at the same time.

[0057] As a preferred embodiment, refer to Figure 4-Figure 6 It can be seen that the rebound part specifically includes: a sleeve 204, which is slidably connected to the channel plate 4 and can move axially; two elastic bosses 202, which are firmly fixed at the pipe mouth positions at both axial ends of the sleeve 204 to provide elastic support; a movable opening 208, which is opened in the middle section of the surface of the sleeve 204 and passes through the top and bottom of the surface of the sleeve 204 to facilitate interaction between internal components; and a rack plate 206, which is fitted and fixed to the middle end of one side of the inner wall of the sleeve 204 for transmission adjustment. A switching component 2 that vertically penetrates the central axis of the channel plate 4 is fixed inside the valve body tube 1. The switching component 2 is used to adjust the relative distance between the first valve plate and the second valve plate to adapt to changes in fluid pressure.

[0058] It should be added that reference Figure 4-Figure 6 It can be seen that in this embodiment, the switching assembly 2 specifically includes: a rod sleeve 203, the rod sleeve 203 is fixed inside the valve body tube 1, and vertically penetrates the central axis of the channel plate 4, and the contact notch 207 is opened at the same interface between the surface of the rod sleeve 203 and the movable opening 208 to ensure alignment and fit; the switching rod 201 is installed in the rod sleeve 203, and its bottom end is connected to the bottom of the rod sleeve 203 through a rotating connection point; and a transmission gear 205, the transmission gear 205 is sleeved and fixed on the surface of the switching rod 201 and the position corresponding to the contact notch 207, and is adapted to the rack plate 206 to form an engaged transmission. By manually or automatically rotating the switching rod 201, the transmission gear 205 drives the rack plate 206 to move axially, thereby pushing the overall axial displacement of the sleeve 204, thereby accurately adjusting the relative distance between the first valve plate and the second valve plate and optimizing the sealing performance.

[0059] As a preferred embodiment, refer to Figure 7 and Figure 8It can be seen that in this embodiment, the valve plate structure 3 includes: a contact dish cover 301, the central axis position of the inner cavity of the contact dish cover 301 is fixed to the top of the elastic protrusion 202, and the central axis of the top end of the surface of the contact dish cover 301 is fixed to the axial bottom end of the supporting column 3024 to provide integrated support; and a storage arc arm 303, which is provided with a number of blocks matching the number and position of the umbrella rib brackets, and is respectively fixed to the edge of the top end of the surface of the contact dish cover 301, and is used to store the umbrella rib structure in the retracted state to keep it compact.

[0060] It should be added that when the device proposed in this application is actually used, reference Figures 1-9 It can be seen that when the fluid positively impacts the contact valve plate 304, the movable sleeve 3023 compresses the spring 3022 and drives the umbrella rib expansion structure to expand radially, so that the outer surface of the contact arc plate 3021 is tightly fitted to the inner wall of the pipe to form an effective seal. When the fluid pressure decreases, the spring 3022 resets and pushes the movable sleeve 3023 to retract, driving the contact arc plate 3021 to separate from the inner wall of the pipe. At this time, the relative movement between the outer surface of the contact arc plate 3021 and the inner wall of the pipe generates a scraping force to peel off the attached dirt. A dirt storage valve tube 5 is installed at the bottom end of the inner wall of the pipe. The top opening of the tube body is precisely located below the scraping track of the contact arc plate 3021 on the inner wall of the pipe, which is used to reliably receive the peeled dirt and prevent secondary blockage.

[0061] It should also be added that when the fluid impacts the outer side surface of the first valve plate, the first valve plate contracts toward the channel plate 4 and compresses the rebound part. The fluid passes through the channel plate 4 and impacts the inner side surface of the second valve plate, causing it to overcome the force of the rebound part and break away from the channel plate 4, thereby allowing the fluid to pass through. When the fluid pressure decreases, the rebound part elastically pushes the second valve plate and allows the second valve plate to return to its original position and fit the channel plate 4, ensuring the efficient operation of the reverse anti-blocking function.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A reverse anti-blocking check valve, comprising a check valve body, characterized in that: An expansion component (302) is provided on the valve plate surface of the check valve body facing the fluid direction; The expansion component (302) includes: The bearing column (3024) is fixed at the central axis of the valve plate surface, and a limiting ring is fixed to the axial top end; The movable sleeve (3023) is slidably mounted on the outside of the bearing column (3024): An umbrella rib deployment structure comprises a plurality of umbrella rib supports consisting of telescopic contact arms (3025) and linkage arms (3026), one end of the telescopic contact arm (3025) being hinged to the surface of a movable sleeve (3023), one end of the linkage arm (3026) being hinged to the bottom end of the axial surface of a bearing column (3024), and the other end being hinged to a contact arc plate (3021), and the other end of the telescopic contact arm (3025) being hinged to the middle portion of the linkage arm (3026); The spring (3022) is sleeved on the surface of the bearing column (3024), with its two ends fixedly connected to the bottom of the limiting ring and the top of the movable sleeve (3023) respectively; The contact valve plate (304) is fixed to the outer periphery of the top of the movable sleeve (3023) and is used to withstand the impact of the fluid and push the movable sleeve (3023) to slide axially; The check valve body is provided with two valve plates, namely a first valve plate and a second valve plate, and a rebound member is fixed between the inner sides of the first valve plate and the second valve plate; The check valve body further comprises a valve body tube (1), a channel plate (4) being fixed to the inner cavity of the valve body tube (1), the first valve plate and the second valve plate being respectively arranged at two ends of the channel plate (4) in an axial direction, and the rebound member being inserted and installed at the central axis of the channel plate (4); When the fluid impacts the outer side of the first valve plate, the first valve plate contracts toward the channel plate (4) and compresses the resilient member. The fluid passes through the channel plate (4) and impacts the inner side of the second valve plate, causing it to overcome the force of the resilient member and break away from the channel plate (4). When the fluid pressure decreases, the resilient member pushes the second valve plate and allows the second valve plate to return to its original position and fit the channel plate (4). When the fluid impacts the contact valve plate (304), the movable sleeve (3023) compresses the spring (3022) and drives the umbrella rib deployment structure to expand radially, so that the outer surface of the contact arc plate (3021) fits the inner wall of the pipe; When the fluid pressure decreases, the spring (3022) resets and pushes the movable sleeve (3023) to retract, driving the contact arc plate (3021) to separate from the inner wall of the pipe. The relative movement between the outer surface of the contact arc plate (3021) and the inner wall of the pipe peels off the attached dirt. A dirt storage valve tube (5) is installed at the bottom end of the inner wall of the pipeline. The top opening of the dirt storage valve tube (5) is located below the scraping track of the contact arc plate (3021) on the inner wall of the pipeline, and is used to receive the stripped dirt.

2. A reverse anti-blocking check valve according to claim 1, characterized in that: The expansion component (302) is installed in the following manners: being installed on the outer side surface of the first valve plate, being installed on the outer side surface of the second valve plate, or being installed on the outer side surfaces of both the first valve plate and the second valve plate.

3. The reverse anti-blocking check valve according to claim 1, characterized in that: The resilient member comprises: A sleeve (204) is slidably connected to the channel plate (4); Two elastic protrusions (202) are respectively fixed at the pipe opening positions at both axial ends of the sleeve (204); A movable opening (208) is provided in the middle section of the surface of the sleeve (204) and penetrates the top and bottom of the surface of the sleeve (204); The rack plate (206) is fixedly attached to the middle end of one side of the inner wall of the sleeve (204).

4. A reverse anti-blocking check valve according to claim 3, characterized in that: A switching assembly (2) vertically penetrating the central axis of the channel plate (4) is fixed inside the valve body tube (1), and the switching assembly (2) is used to adjust the relative distance between the first valve plate and the second valve plate; The switching component (2) comprises: A rod sleeve (203) is fixed inside the valve body tube (1) and vertically penetrates the central axis of the channel plate (4); A contact notch (207) is provided at the same interface between the surface of the rod sleeve (203) and the movable opening (208); The switching rod (201) is installed in the rod sleeve (203), and the bottom end is rotatably connected to the bottom of the rod sleeve (203); The transmission gear (205) is sleeved and fixed on the surface of the switching rod (201) and at a position corresponding to the contact notch (207), and is adapted to the rack plate (206); By rotating the switching rod (201), the transmission gear (205) drives the rack plate (206) to move axially, so that the sleeve (204) moves axially as a whole, thereby adjusting the relative distance between the first valve plate and the second valve plate.

5. The reverse anti-blocking check valve according to claim 3, characterized in that: The valve plate comprises: The contact dish cover (301) has a central axis position of an inner cavity fixed to the top of the elastic convex seat (202), and a central axis of a top surface of the contact dish cover (301) is fixed to an axial bottom end of the bearing column (3024); The receiving arc arm (303) is provided with a number of blocks matching the number and position of the umbrella rib brackets, and is respectively fixed to the edge of the top end of the contact dish cover (301).

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