A check valve with a safety valve

Abstract

The present invention discloses a check valve with a safety valve, which relates to the technical field of check valves and includes: a valve body, a valve cavity is provided in the center of the valve body, a valve disc is provided to seal one side of the valve cavity, a sealing ring is provided at the connection between the valve disc and the valve cavity, a top block is connected to the other side of the valve disc, a rotating rod is connected to the top block, and the top end of the rotating rod is hinged to the valve body; a safety valve, the safety valve is provided on the upper part of the valve body, the bottom end of the safety valve extends into the valve cavity, an overflow inlet connected to the valve cavity is provided on the side of the safety valve, an elastic membrane is connected to the bottom end of the safety valve, and the top block contacts the elastic membrane after the valve disc rotates. The present invention realizes a non-return effect on the fluid by rotating the valve disc, ensuring the unidirectional flow of the fluid; the safety valve is integrated on the check valve, and the overflow inlet is provided on the side of the safety valve. When the top block squeezes the elastic membrane to release pressure, the fluid can flow out from the overflow outlet on the side, solving the problem that the gap at the squeeze point is small and cannot quickly release pressure, thereby improving the reliability of the safety valve.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and more particularly to a check valve with a safety valve. Background Art

[0002] A check valve is a valve with a circular disc as its opening and closing member. It operates by its own weight and the pressure of the medium to prevent the backflow of the medium. To control the pressure in the pipeline to a specified value, a safety valve must be connected to the outlet of the check valve to prevent the pressure from exceeding the specified value. This ensures that the liquid in the pipeline remains within the specified value during circulation.

[0003] In the prior art, for example, the invention patent application number CN201811270335.X discloses a check valve with a safety valve, comprising a valve body and a safety valve. An end cap is mounted on one side of the outer wall of the valve body. A pin is mounted inside the end cap, which is rotatably connected to the valve body. A rotating shaft is fixed to the end of the pin, and a rocker is fixed to the outside of the rotating shaft. A valve disc is mounted in the inner cavity of the valve body. A valve disc sealing ring is mounted on one side of the valve disc. A plug is fixed to the middle of the other side of the valve disc. The outside of the plug is fixedly connected to the end of the rocker. A valve cap is mounted on the top of the valve body. A safety valve is mounted on one side of the top of the valve body. The safety valve comprises a housing, a flap body, a valve stem, and a spring. The flap body is mounted at the junction of the housing and the inner cavity of the valve body. A mating surface that matches the plug is formed in the middle of the side of the flap body away from the housing. This device helps save installation space in the pipeline by combining the check valve and the safety valve.

[0004] However, during actual use, when the head contacts the mating surface of the petal body, the through hole will be partially blocked, resulting in the problem that the fluid cannot flow out quickly and release pressure.

[0005] Therefore, it is necessary to propose a check valve with a safety valve to at least partially solve the problems existing in the prior art. Summary of the Invention

[0006] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0007] To at least partially solve the above problems, the present invention provides a check valve with a safety valve, comprising:

[0008] The valve body has a valve cavity in the center, a valve disc is provided to seal one side of the valve cavity, a sealing ring is provided at the connection between the valve disc and the valve cavity, a top block is connected to the other side of the valve disc, a rotating rod is connected to the top block, and the top end of the rotating rod is hinged to the valve body;

[0009] Safety valve, the safety valve is arranged on the upper part of the valve body, the bottom end of the safety valve extends into the valve cavity, the side of the safety valve is provided with an overflow inlet connected to the valve cavity, the bottom end of the safety valve is connected to an elastic membrane, and the top block contacts the elastic membrane after the valve disc rotates.

[0010] Preferably, an overflow outlet is provided at the top of the safety valve, and a protective cover is provided on the overflow outlet upper cover of the safety valve.

[0011] Preferably, the safety valve includes: a pressure plate, a guide groove and a pressure-stabilizing spring, the pressure plate is connected to the center of the elastic membrane, the guide groove is set on the inner wall of the safety valve and arranged along the length direction of the safety valve, the pressure plate is slidably connected in the guide groove, and the pressure-stabilizing spring is connected between the pressure plate and the end of the guide groove.

[0012] Preferably, the safety valve further includes an on-off assembly, which includes:

[0013] The telescopic ring is slidably connected to the telescopic groove at the bottom end of the side wall of the safety valve. A through hole is provided on the telescopic ring, and the through hole is adapted to the overflow inlet. The bottom end of the telescopic ring is connected to the elastic membrane;

[0014] An elastic member is connected between the telescopic ring and the top of the telescopic groove, and the elastic member applies a thrust to the telescopic ring to slide outward;

[0015] Pull rope, one end of the pull rope is connected to the top of the telescopic ring, and the other end passes through the inner wall of the safety valve and is connected to the top of the pressure plate.

[0016] Preferably, the on-off assembly further comprises:

[0017] Guide wheels, multiple guide wheels are connected to the inner wall of the safety valve, and the height of the safety valve is not lower than the height of the top of the telescopic groove.

[0018] Preferably, the on-off assembly further comprises:

[0019] A winding chamber, which is arranged at the lower part of the telescopic ring;

[0020] The film roller is rotatably connected to the winding chamber, and a coil spring is connected to the film roller shaft. One end of the elastic film passes through the bottom end of the telescopic ring and is wound around the film roller.

[0021] Preferably, the safety valve further includes a flow guide assembly, which includes:

[0022] Rack, the rack is connected to the inside of the telescopic ring

[0023] Gear, the gear is rotatably connected to the inner wall of the safety valve near the overflow inlet;

[0024] The reversing gear is rotatably connected to the inner wall of the safety valve near the overflow inlet, and the reversing gear is meshed and connected between the rack and the gear;

[0025] The guide plate is connected to the gear shaft of the gear, and a sealing film is connected between the bottom end of the guide plate and the inner wall of the safety valve.

[0026] Preferably, the flow guide assembly further comprises:

[0027] The filter screen is connected between the end of the guide plate and the inner wall of the safety valve.

[0028] Preferably, the flow guide assembly further comprises:

[0029] The impeller is connected to the upper part of the inner wall of the safety valve through a bracket, and an upward spiral vortex is formed when the impeller rotates.

[0030] Preferably, the center of the pressure plate includes a floating assembly, and the floating assembly includes:

[0031] Mounting slot, the mounting slot is set in the center of the pressure plate;

[0032] The floating block is arranged in the installation groove, and the bottom end of the floating block is provided with a groove adapted to the top block;

[0033] An airbag layer is laminated and connected between the mounting groove and the floating block;

[0034] a first passage, the first passage being arranged around the floating block and having one end passing through the bottom end of the floating block;

[0035] A second passage is provided around the floating block and arranged inside the first passage, one end of the second pipe passes through the bottom end of the floating block, and the other end is communicated with the first passage;

[0036] first communicating holes, wherein the first passage is connected to the air inlet of the airbag layer through a plurality of first communicating holes;

[0037] Second communicating holes, the second pipeline is connected to the groove through multiple second communicating holes.

[0038] Compared with the prior art, the present invention has at least the following beneficial effects:

[0039] The present invention provides a check valve with a safety valve, which realizes a non-return effect on the fluid by rotating the valve disc, thereby ensuring the unidirectional flow of the fluid; the safety valve is integrated on the check valve, and the overflow inlet is set on the side of the safety valve. When the top block squeezes the elastic membrane to release the pressure, the fluid can flow out from the overflow outlet on the side, solving the problem that the gap at the squeezing point is too small to release the pressure quickly, thereby improving the reliability of the safety valve.

[0040] The other advantages, objectives and features of the check valve with a safety valve described in the present invention will be partially reflected in the following description and will also be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0042] Figure 1 This is a schematic cross-sectional view of a check valve with a safety valve according to the present invention;

[0043] Figure 2 Schematic diagram of the cross-sectional structure of the safety valve of the present invention (with the overflow inlet open);

[0044] Figure 3 Schematic diagram of the cross-sectional structure of the safety valve of the present invention (overflow inlet blocked);

[0045] Figure 4 For the present invention Figure 3 A partial enlarged structural diagram in the middle;

[0046] Figure 5 For the present invention Figure 3 The local enlarged structure diagram at B in the middle;

[0047] Figure 6 It is a schematic diagram of the cross-sectional structure of the floating assembly in the present invention.

[0048] In the figure: 1. Valve body; 2. Valve chamber; 3. Valve disc; 4. Sealing ring; 5. Top block; 6. Rotating rod; 7. Safety valve; 11. Overflow inlet; 12. Overflow outlet; 13. Elastic membrane; 14. Protective cover; 15. Pressure plate; 16. Guide groove; 17. Pressure-stabilizing spring; 18. Telescopic ring; 19. Through hole; 21. Telescopic groove; 22. Elastic member; 23. Winding chamber; 24. Membrane roller; 25. Pull rope; 26. Guide wheel; 27. Rack; 28. Gear; 29. ​​Guide plate; 30. Reversing gear; 31. Sealing membrane; 32. Filter screen; 33. Impeller; 41. Mounting slot; 42. Floating block; 43. Airbag layer; 44. First passage; 45. Second passage; 46. First connecting hole; 47. Second connecting hole; 48. Groove. DETAILED DESCRIPTION

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0050] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0051] Example 1:

[0052] like Figure 1-3As shown, the present invention provides a check valve with a safety valve, comprising:

[0053] The valve body 1 has a valve cavity 2 in the center, a valve disc 3 is provided on one side of the valve cavity 2 to block it, a sealing ring 4 is provided at the connection between the valve disc 3 and the valve cavity 2, a top block 5 is connected to the other side of the valve disc 3, a rotating rod 6 is connected to the top block 5, and the top end of the rotating rod 6 is hinged to the valve body 1;

[0054] Safety valve 7, the safety valve 7 is arranged on the upper part of the valve body 1, the bottom end of the safety valve 7 extends into the valve cavity 2, the side of the safety valve 7 is provided with an overflow inlet 11 connected to the valve cavity 2, the bottom end of the safety valve 7 is connected to the elastic membrane 13, and after the valve disc 3 rotates, the top block 5 contacts the elastic membrane 13.

[0055] The working principle and beneficial effects of the above technical solution are:

[0056] The present invention provides a check valve with a safety valve. A fluid inlet and a fluid outlet are provided at both ends of a valve body 1, and a valve chamber 2 is provided in the center. Fluid can pass through the fluid inlet, the valve chamber 2, and the fluid outlet in sequence. A valve flap 3 is provided on the side near the fluid inlet, and the valve flap 3 blocks the side of the valve chamber 2 connected to the fluid inlet. When the fluid pressure exceeds a preset value, the fluid squeezes the valve flap 3, pushing it to overcome gravity and rotate upward with the top of the push rod 6 as the center, allowing the fluid to flow freely. When the fluid flows in the opposite direction, the squeezing force on the valve flap 3 decreases, and the valve flap 3 rotates downward under the action of gravity to reset, re-blocking the valve chamber 2 and playing a check valve role. A safety valve 7 is provided on the upper part of the valve body 1. When the fluid pressure is too high, the valve flap 3 is pressed into contact with the elastic membrane 13 of the safety valve 7. When the contact pressure reaches a preset value, the overflow inlet 11 is automatically opened, allowing the fluid to flow through the overflow inlet 11 into the safety valve 7 and then out.

[0057] Through the above structural design, the valve disc 3 is rotated to realize the non-return effect on the fluid, thereby ensuring the one-way flow of the fluid; the safety valve 7 is integrated on the non-return valve, and the overflow inlet 11 is set on the side of the safety valve 7. When the top block 5 squeezes the elastic membrane 13 to release the pressure, the fluid can flow out from the overflow outlet 11 on the side, which solves the problem that the gap at the squeezing point is too small to release the pressure quickly, and improves the reliability of the safety valve 7.

[0058] Example 2:

[0059] like Figure 2 、 3 As shown, on the basis of the above embodiment 1, an overflow outlet 12 is provided at the top of the safety valve 7, and a protective cover 14 is provided on the overflow outlet 12 of the safety valve 7.

[0060] The working principle and beneficial effects of the above technical solution are:

[0061] The fluid enters the safety valve 7 through the overflow inlet 11 and then flows out from the overflow outlet 12 at the top; a protective cover 14 is provided on the overflow outlet 12 to improve the wear resistance and erosion resistance of the safety valve 7 and extend the service life of the safety valve 7.

[0062] Example 3:

[0063] like Figure 2-4 As shown, based on the above-mentioned embodiment 1, the safety valve 7 includes: a pressure plate 15, a guide groove 16 and a pressure-stabilizing spring 17. The pressure plate 15 is connected to the center of the elastic membrane 13. The guide groove 16 is provided on the inner wall of the safety valve 7 and arranged along the length direction of the safety valve 7. The pressure plate 15 is slidably connected in the guide groove 16. The pressure-stabilizing spring 17 is connected between the pressure plate 15 and the end of the guide groove 16.

[0064] The working principle and beneficial effects of the above technical solution are:

[0065] An elastic membrane 13 is provided on the safety valve 7. Under the action of the pressure-stabilizing spring 17, the elastic membrane 13 is sealed at the bottom end of the safety valve 7. The elastic membrane 13 does not deform or deforms slightly under the action of the fluid pressure, thereby stabilizing the pressure in the valve cavity 2. When the fluid pressure reaches a preset value, the valve plate 3 rotates under the action of the fluid pressure and contacts the top block 5, squeezing the top block 5 to move toward the upper part of the safety valve 7. When it moves to the preset position, the overflow inlet 11 is opened to discharge the fluid, thereby achieving safety protection for the check valve.

[0066] Example 4:

[0067] like Figure 2-5 As shown, based on the above embodiment 3, the safety valve 7 further includes an on-off assembly, which includes:

[0068] The telescopic ring 18 is slidably connected to the telescopic groove 21 at the bottom end of the side wall of the safety valve 7. A through hole 19 is provided through the telescopic ring 18, and the through hole 19 is adapted to be arranged with the overflow inlet 11. The bottom end of the telescopic ring 18 is connected to the elastic membrane 13;

[0069] The elastic member 22 is connected between the telescopic ring 18 and the top of the telescopic groove 21, and the elastic member 22 applies a thrust to the telescopic ring 18 to slide outward;

[0070] A pull rope 25, one end of which is connected to the top of the telescopic ring 18, and the other end of which passes through the inner wall of the safety valve 7 and is connected to the top of the pressure plate 15;

[0071] The guide wheels 26 , multiple guide wheels 26 are connected to the inner wall of the safety valve 7 , and the height of the safety valve 7 is not lower than the height of the top of the telescopic slot 21 .

[0072] The working principle and beneficial effects of the above technical solution are:

[0073] When the top block 5 moves upward, one end of the pull rope 25 is loosened, and the pull rope 25 is connected to the top of the telescopic ring 18 through the guide wheel 26. Under the elastic force of the elastic member 22, the telescopic ring 18 moves downward to tighten the other end of the pull rope 25, and the telescopic ring 18 extends out of the bottom end of the safety valve 7 and does not interfere with the valve disc 3, the top block 5 and the rotating rod 6; when the through hole 19 on the telescopic ring 18 corresponds to the overflow inlet 11, the interior of the safety valve 7 is connected with the valve chamber 2, and the high-pressure fluid enters the safety valve 7 through the through hole 19 and the overflow inlet 11 and is then discharged; when the fluid pressure in the valve chamber 2 drops to a preset value, the valve disc 3 is reversed under the action of gravity and separated from the elastic membrane 13, so that the deformation of the elastic membrane 13 is restored, and the pressure plate 15 is reset under the action of the elastic force, and the telescopic ring 18 is pulled back into the telescopic groove 21 again by the pull rope 25, and the through hole 19 is staggered with the overflow inlet 11, so that the overflow inlet 11 is re-blocked.

[0074] Through the above-mentioned structural design, the action of the top block 5 squeezing the elastic membrane 13 is linked with the on-off action of the overflow inlet 11, so that when the fluid pressure reaches a preset value, the overflow inlet 11 can be automatically opened, so that the fluid can flow into the interior of the safety valve 7 from both sides and discharge; compared with the method of setting the overflow inlet 11 on the elastic membrane 13, the reliability is higher.

[0075] Example 5:

[0076] like Figure 5 As shown, based on the above embodiment 4, the switch component further includes:

[0077] The winding chamber 23 is provided at the lower portion of the telescopic ring 18;

[0078] The film roller 24 is rotatably connected to the winding chamber 23 , and a coil spring is connected to the rotating shaft of the film roller 24 . One end of the elastic film 13 passes through the bottom end of the telescopic ring 18 and is wound around the film roller 24 .

[0079] The working principle and beneficial effects of the above technical solution are:

[0080] When the on-off assembly is in use, as the positions of the pressure plate 15 and the telescopic ring 18 change, one end of the elastic membrane 13 is unwound or reeled on the membrane roller 24, so that the length of the elastic membrane 13 also changes accordingly, thereby preventing the elastic membrane 13 itself from being excessively stretched and deformed, and extending the service life of the elastic membrane 13; the setting of the coil spring can enable the elastic membrane 13 to maintain a taut state, and assist the membrane roller 24 to reel in when the elastic membrane 13 becomes shorter.

[0081] Example 6:

[0082] like Figure 5 As shown, based on the above embodiment 4, the safety valve 7 further includes a flow guide component, which includes:

[0083] Rack 27, which is connected to the inside of the telescopic ring 18

[0084] Gear 28, gear 28 is rotatably connected to the inner wall of the safety valve 7 near the overflow inlet 11;

[0085] The reversing gear 30 is rotatably connected to the inner wall of the safety valve 7 near the overflow inlet 11, and the reversing gear 30 is meshed and connected between the rack 27 and the gear 28;

[0086] The guide plate 29 is connected to the gear shaft of the gear 18 , and a sealing membrane 31 is connected between the bottom end of the guide plate 29 and the inner wall of the safety valve 7 .

[0087] The working principle and beneficial effects of the above technical solution are:

[0088] When the telescopic ring 18 is received in the telescopic groove 21, the free end of the guide plate 29 extends toward the upper part of the safety valve 7, and the guide plate 29 is arranged close to the inner wall of the safety valve 7; as the telescopic ring 19 moves downward and extends, it drives the rack 27 to move downward, and the rack 27 engages with the reversing gear 30 for transmission, driving the gear 28 to rotate toward the center of the safety valve 7, and the gear shaft of the gear 28 drives the guide plate 29 to rotate synchronously until the guide plate 29 contacts the pressure plate 15; the guide plate 29, the pressure plate 15, the sealing membrane 31 and the inner wall of the safety valve 7 are surrounded to form a diversion space, and the fluid can flow upward along the guide plate 29 after entering through the overflow inlet 11, so that the fluid can be discharged quickly; after the fluid entering from the overflow inlet 11 is diverted, the direction of the fluid in each overflow inlet 11 will not directly generate impact, thereby ensuring the effective entry of the fluid and improving the impact resistance of the safety valve 7.

[0089] Example 7:

[0090] like Figure 2 、 3 As shown, based on the above embodiment 6, the flow guide component further includes:

[0091] The filter screen 32 is connected between the end of the guide plate 29 and the inner wall of the safety valve 7.

[0092] The working principle and beneficial effects of the above technical solution are:

[0093] A filter screen 32 is arranged between the guide plate 29 and the safety valve 7. When the free end of the guide plate 29 rotates downward, the filter screen 32 is driven to unfold and is arranged in the discharge path of the fluid to filter the sand and gravel mixed in the fluid, thereby reducing the impact of the sand and gravel on the safety valve 7 body and reducing the possibility of blockage of the overflow outlet 12; when the free end of the guide plate 29 rotates upward, the filter screen 32 is driven to retract against the inner wall of the safety valve 7.

[0094] Example 8:

[0095] like Figure 2 、 3 As shown, based on the above embodiment 7, the flow guide component further includes:

[0096] The impeller 33 is connected to the upper portion of the inner wall of the safety valve 7 through the bracket 34. When the impeller 33 rotates, an upward spiral vortex is formed.

[0097] The working principle and beneficial effects of the above technical solution are:

[0098] An impeller 33 is provided on the upper part of the safety valve 7. The impeller 33 rotates under the action of the airflow, and forms an upward spiral vortex during rotation, which has a certain suction effect on the fluid in the lower part, thereby accelerating the outflow of the fluid; and changes the flow direction of the fluid discharged from the safety valve 7 to avoid direct overflow and spraying, which may cause harm to the user.

[0099] Example 9:

[0100] like Figure 6 As shown, based on the above embodiment 3, the center of the pressure plate 15 includes a floating component, and the floating component includes:

[0101] Mounting slot 41, the mounting slot 41 is provided at the center of the pressing plate 15;

[0102] The floating block 42 is arranged in the mounting groove 41, and the bottom end of the floating block 42 is provided with a groove 48 adapted to the top block 5;

[0103] The airbag layer 43 is attached between the mounting groove 41 and the floating block 42;

[0104] A first passage 44 is provided around the floating block 42 and one end of the first passage 44 passes through the bottom end of the floating block 42;

[0105] The second passage 45 is provided around the floating block 42 and arranged inside the first passage 44. One end of the second pipe 45 passes through the bottom end of the floating block 42, and the other end is connected to the first passage 44;

[0106] First communication holes 46 , the first passage 44 is connected to the air inlet of the airbag layer 43 through a plurality of first communication holes 46 ;

[0107] Second communicating holes 47 , the second pipeline 45 is connected to the groove 48 through a plurality of second communicating holes 47 .

[0108] The working principle and beneficial effects of the above technical solution are:

[0109] The valve plate 3 rotates under pressure, causing the top block 5 to contact the pressure plate 15. During the squeezing process of the pressure plate 15, due to factors such as unstable pressure in the valve chamber 2, the top block 5 will collide with the pressure plate 15, causing damage to the top block 5 and the pressure plate 15, thereby affecting the service life of the valve. A floating assembly is provided on the top block 5, and an airbag layer 43 is provided between the mounting groove 41 and the floating block 42. The fluid filled in the airbag layer 43 can provide a buffering force for the floating block 43, effectively dissipating the impact in the event of a collision. When the floating assembly is in use, the fluid in the valve chamber 2 enters through one end of the first passage 44, and part of the fluid enters the airbag layer 43 through the first connecting hole 46 to replenish the fluid inside, ensuring that the airbag layer 43 has sufficient elasticity; the other part of the fluid enters the second pipeline 45; the second pipeline 45 Part of the internal fluid flows back to the valve cavity 2 to maintain the pressure balance in the valve cavity 2, and the other part of the fluid is blown into the groove 48 through the second through hole 47 and surrounded by the end of the top block 5, forming a floating effect; and after the fluid in the groove 48 is squeezed out, the top block 5 contacts the groove 48 again; each time a collision occurs, the top block 5 and the groove 48 are separated, providing space for floating; effectively reducing the impact force between the top block 5 and the groove 48, reducing the collision damage of the top block 5 and the groove 48, and further extending the service life of the valve.

[0110] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0111] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0112] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A check valve with a safety valve, characterized in that: include: A valve body (1), a valve cavity (2) is provided at the center of the valve body (1), a valve disc (3) is provided on one side of the valve cavity (2) for blocking, a sealing ring (4) is provided at the connection between the valve disc (3) and the valve cavity (2), a top block (5) is connected to the other side of the valve disc (3), a rotating rod (6) is connected to the top block (5), and the top end of the rotating rod (6) is hinged to the valve body (1); The safety valve (7) is provided on the upper portion of the valve body (1), the bottom end of the safety valve (7) extends into the valve cavity (2), an overflow inlet (11) communicating with the valve cavity (2) is provided on the side of the safety valve (7), the bottom end of the safety valve (7) is connected to an elastic membrane (13), and after the valve disc (3) rotates, the top block (5) contacts the elastic membrane (13); The safety valve (7) comprises: a pressure plate (15), a guide groove (16) and a pressure stabilizing spring (17); the pressure plate (15) is connected to the center of the elastic membrane (13); the guide groove (16) is provided on the inner wall of the safety valve (7) and arranged along the length direction of the safety valve (7); the pressure plate (15) is slidably connected in the guide groove (16); and the pressure stabilizing spring (17) is connected between the pressure plate (15) and the end of the guide groove (16); The safety valve (7) further includes an on-off assembly, which includes: A telescopic ring (18) is slidably connected to the telescopic groove (21) at the bottom end of the side wall of the safety valve (7). A through hole (19) is provided through the telescopic ring (18), and the through hole (19) is adapted to be provided with the overflow inlet (11). The bottom end of the telescopic ring (18) is connected to the elastic membrane (13); An elastic member (22), the elastic member (22) being connected between the telescopic ring (18) and the top end of the telescopic groove (21), and the elastic member (22) exerting a thrust on the telescopic ring (18) to slide outward; A pull rope (25) is connected to the top of the telescopic ring (18) through the guide wheel (26), and the other end passes through the inner wall of the safety valve (7) and is connected to the top of the pressure plate (15); A winding chamber (23), the winding chamber (23) being arranged at the lower portion of the telescopic ring (18); The membrane roller (24) is rotatably connected to the winding chamber (23), and a coil spring is connected to the rotating shaft of the membrane roller (24). One end of the elastic membrane (13) passes through the bottom end of the telescopic ring (18) and is wound around the membrane roller (24).

2. A check valve with a safety valve according to claim 1, characterized in that: An overflow outlet (12) is provided at the top end of the safety valve (7), and a protective cover (14) is provided on the overflow outlet (12) of the safety valve (7).

3. A check valve with a safety valve according to claim 1, characterized in that: The safety valve (7) further includes a flow guide assembly, which includes: A rack (27), the rack (27) is connected to the inner side of the telescopic ring (18); A gear (28) is rotatably connected to an inner wall of the safety valve (7) near the overflow inlet (11); A reversing gear (30) is rotatably connected to the inner wall of the safety valve (7) near the overflow inlet (11), and the reversing gear (30) is meshedly connected between the rack (27) and the gear (28); The guide plate (29) is connected to the gear shaft of the gear (28), and a sealing film (31) is connected between the bottom end of the guide plate (29) and the inner wall of the safety valve (7).

4. A check valve with a safety valve according to claim 3, characterized in that: The diversion components also include: A filter screen (32) is connected between the end of the guide plate (29) and the inner wall of the safety valve (7).

5. A check valve with a safety valve according to claim 1, characterized in that: The center of the pressure plate (15) includes a floating assembly, which includes: A mounting groove (41), the mounting groove (41) being arranged at the center of the pressing plate (15); A floating block (42), the floating block (42) is arranged in the mounting groove (41), and a groove (48) adapted to the top block (5) is provided at the bottom end of the floating block (42); An airbag layer (43), the airbag layer (43) is fitted and connected between the mounting groove (41) and the floating block (42); A first passage (44), the first passage (44) is arranged around the floating block (42) and one end of the first passage (44) passes through the bottom end of the floating block (42); A second passage (45), the second passage (45) is arranged around the floating block (42) and arranged inside the first passage (44), one end of the second passage (45) passes through the bottom end of the floating block (42), and the other end is connected to the first passage (44); First communication holes (46), the first passage (44) is connected to the air inlet of the airbag layer (43) through a plurality of first communication holes (46); Second communication holes (47), the second passage (45) is connected to the groove (48) through a plurality of second communication holes (47).

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