A lift type slow-closing silencing check valve

Abstract

The present invention discloses a lifting slow-closing silencing check valve, specifically relating to the technical field of check valves, including a valve body. A valve cavity is provided at the center inside the valve body. One end of the valve body is provided with a passage one and a passage three distributed up and down, and the other end of the valve body is provided with a passage two and a passage four distributed up and down. One ends of the passage one, the passage two, the passage three and the passage four are all communicated with the outside, and the other ends of the passage one, the passage two, the passage three and the passage four are all communicated with the inside of the valve cavity; Two closing mechanisms are arranged inside the valve cavity, and the two closing mechanisms are respectively arranged at the other ends of the passage three and the passage four to close the passage three and the passage four; A plugging assembly is arranged inside the valve cavity. The present invention has a slow-closing function, preventing the first valve flap from being damaged due to too fast descent and hitting the valve body, and has low noise. At the same time, it has a two-way anti-reverse function adapting to the fluid flow direction. When the fluid flow direction in the pipeline changes, there is no need to disassemble and reinstall, and it has a wide application range.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and particularly relates to a lift - type slow - closing and sound - eliminating check valve. Background Art

[0002] A valve is a pipeline accessory used to open and close pipelines, control the flow direction, and regulate and control the parameters (temperature, pressure, and flow rate) of the transported medium. A check valve is a valve that can block the reverse flow of the medium. When the inlet pressure is greater than the sum of the weight of the valve flap and its flow resistance, the valve is opened. Conversely, when the medium flows backward, the valve closes, so the medium is only allowed to flow in one direction.

[0003] A lift - type check valve is a type of check valve, and its main functions are to prevent the reverse flow of the medium, prevent the pump and the driving motor from reversing, and the discharge of the container medium. The lift - type check valve is similar in structure to a globe valve, only lacking the valve stem that drives the valve flap.

[0004] Currently, when the lift - type check valve moves vertically to close the valve under the action of the backflow, the impact force is too large, which is likely to damage the sealing surface and produce a large noise. At the same time, the existing lift - type check valve only has a one - way check function, making it impossible to change according to the fluid direction. When the fluid direction changes, it needs to be disassembled and reinstalled, with a small scope of application. Summary of the Invention

[0005] The purpose of the present invention is to provide a lift - type slow - closing and sound - eliminating check valve, which has a slow - closing function to prevent the first valve flap from being damaged due to excessive impact with the valve body when descending too fast, and has low noise. At the same time, it has a two - way check function that adapts to the fluid flow direction. When the fluid flow direction in the pipeline changes, it does not need to be disassembled and reinstalled, with a wide range of applications, so as to solve the above deficiencies in the technology.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A lift - type slow - closing and sound - eliminating check valve, including a valve body. A valve cavity is provided at the center inside the valve body. One end of the valve body is provided with a channel one and a channel three distributed vertically, and the other end of the valve body is provided with a channel two and a channel four distributed vertically. One ends of the channel one, channel two, channel three, and channel four are all communicated with the outside, and the other ends of the channel one, channel two, channel three, and channel four are all communicated with the inside of the valve cavity.

[0007] Two closing mechanisms are provided inside the valve cavity, and the two closing mechanisms are respectively arranged at the other ends of the channel three and the channel four to close the channel three and the channel four.

[0008] A plugging assembly is provided inside the valve cavity, and the plugging assembly is arranged above the closing mechanism.

[0009] A discharge mechanism is provided at the bottom end of the valve body, and a deodorizing mechanism is provided at the top end of the valve body.

[0010] Preferably, the closing mechanism includes a valve tube, a lifting rod, a circular ring, a spring, a first valve flap and a first sealing ring. The valve tube is fixed on the inner wall of the valve cavity. The lifting rod is arranged inside the valve tube and the bottom end of the lifting rod extends out of the bottom end of the valve tube. The top surface of the lifting rod is flush with the top surface of the valve tube. A first valve flap is fixedly arranged at the bottom end of the lifting rod. A first sealing ring is fixedly arranged at the bottom end of the first valve flap. A circular ring is fixed to the outer end of the lifting rod. The circular ring is arranged inside the valve tube and can slide up and down along the valve tube. The spring is arranged at the outer end of the lifting rod and is arranged between the bottom end of the circular ring and the inner bottom end of the valve tube. Second sealing rings are fixedly arranged at both ends of the valve tube, and the two second sealing rings are respectively sleeved on the outer end of the lifting rod for closing the channel.

[0011] Preferably, the first valve flap on the closing mechanism at the other end of the third channel is arranged at the top of the third channel, and the first sealing ring at the bottom end of the first valve flap closes the other end of the third channel. The first valve flap on the closing mechanism at the other end of the fourth channel is arranged at the top of the fourth channel, and the first sealing ring at the bottom end of the first valve flap closes the other end of the fourth channel.

[0012] Preferably, the plugging assembly includes a rotating rod arranged on the inner wall of the valve cavity through a rotating shaft. Telescopic rods are fixedly arranged on both sides of the rotating rod. Second valve flaps are arranged at the ends of the two telescopic rods away from the rotating rod. The telescopic rods are rotatably connected to the second valve flaps. Third sealing rings are fixedly arranged at the top ends of the two second valve flaps. The bottom end of the left second valve flap is arranged at the top of the valve tube of the closing mechanism at the other end of the third channel, and the left second valve flap is directly below the other end of the first channel. The bottom end of the right second valve flap is arranged directly above the valve tube of the closing mechanism at the other end of the fourth channel, and the right second valve flap is at the bottom of the other end of the second channel, and the third sealing ring on the right second valve flap closes the other end of the second channel.

[0013] Preferably, fixing plates are arranged on the left side of the left second valve flap and on the right side of the right second valve flap. The two fixing plates are both fixed on the inner wall of the valve cavity, and chutes are opened at the front ends of the two fixing plates. Sliders are fixedly arranged on the left side of the left second valve flap and on the right side of the right second valve flap. The ends of the two sliders away from the second valve flaps are respectively slidably connected inside the two chutes.

[0014] Preferably, a transparent observation window is inlaid at the front end of the valve body for facilitating the observation of the internal situation of the valve body. The front end of the rotating shaft on the rotating rod penetrates through the transparent observation window and extends out of the front end of the valve body, and the rotating shaft is connected to the transparent observation window through a sealing bearing. A knob is fixedly arranged at the front end of the rotating shaft, and the knob is locked with the front end of the transparent observation window through a bolt.

[0015] Preferably, a lower opening is provided at the bottom end of the valve body. The lower opening is located between passage three and passage four, and is provided at the bottom end of the valve cavity and communicates with the inside of the valve cavity. The discharge mechanism includes a lower valve cover, a plugging rod, and a fourth sealing ring. The lower valve cover is fixed to the bottom end of the valve body. The plugging rod passes through the lower valve cover and is threadedly connected to the lower valve cover. The top end of the plugging rod is inserted into the lower opening to block the lower opening. The fourth sealing ring is sleeved outside the plugging rod and is arranged between the lower valve cover and the valve body, facilitating the discharge of the residual fluid in the valve cavity.

[0016] Preferably, an upper opening is provided at the top end of the valve body. The upper opening is located between passage one and passage two, and is provided at the top end of the valve cavity and communicates with the inside of the valve cavity. The deodorizing mechanism includes an upper valve cover fixed to the top end of the valve body. A hollow plugging rod is fixedly provided at the bottom end of the upper valve cover. A waterproof and breathable film is fixedly provided at the bottom end of the hollow plugging rod. A fifth sealing ring is sleeved on the top of the outer end of the hollow plugging rod. A box body with a box cover at the top is fixed to the top end of the upper valve cover. The box body communicates with the inside of the hollow plugging rod. Multiple activated carbon adsorption plates are arranged inside the box body to adsorb the odor generated by the fluid that has accumulated for too long, achieving the effect of deodorization.

[0017] Preferably, filter meshes are fixedly provided inside both ends of the valve body. The left filter mesh is arranged at one end of passage one and passage three, and the right filter mesh is arranged at one end of passage two and passage four to filter impurities in the fluid.

[0018] Preferably, connection components are provided at both ends of the valve body. Both connection components include a connecting pipe bent into an arc shape and flanges fixedly provided at both ends of the connecting pipe. The flange close to the valve body is fixedly connected to the valve body. A sewage pipe is fixedly provided at the bottom end of the connecting pipe. A sealing plug is threadedly connected inside the sewage pipe, and the bottom end of the sealing plug extends out of the bottom end of the sewage pipe. A sixth sealing ring is arranged between the sewage pipe and the sealing plug, facilitating the discharge of the filtered impurities.

[0019] In the above technical solution, the technical effects and advantages provided by the present invention are as follows:

[0020] 1. When the fluid is conveyed from right to left, passage two and passage three are closed. The pressure of the fluid impacts the first valve flap of the right-side closing mechanism, causing the first valve flap to move upward, opening passage four. Then the fluid flows out through passage one. When the fluid conveyance stops, the first valve flap descends to close passage four, preventing the fluid from flowing backward.

[0021] When the fluid is conveyed from left to right, passage one and passage four are first closed by the plugging component. The fluid causes the first valve flap of the left-side closing mechanism to rise, opening passage three. The fluid flows out through passage two. When the fluid conveyance stops, the first valve flap descends to close passage three, preventing the fluid from flowing backward.

[0022] The present invention has a two-way check function that adapts to the fluid flow direction. When the fluid flow direction in the pipeline changes, there is no need to disassemble and reinstall, and it has a wide range of applications.

[0023] 2. When the fluid stops being transported, the lifting rod, the ring, and the first valve flap descend. At the same time, the ring falls and is blocked by the spring, causing the first valve flap to descend slowly, thus having a slow-closing function, preventing the first valve flap from being damaged due to a too-fast descent and hitting the valve body, and having low noise.

[0024] 3. The discharge mechanism facilitates the discharge of the residual fluid in the valve cavity, and the deodorizing mechanism adsorbs the peculiar smell generated by the fluid that has accumulated for too long, achieving the effect of deodorization.

[0025] 4. The filter screen filters the impurities in the fluid, and the impurities are deposited in the connecting pipe. Opening the sealing plug facilitates the discharge of the impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is the overall structure diagram of the present invention;

[0028] Figure 2 is the cross-sectional view of the present invention;

[0029] Figure 3 is the Figure 2 partial enlarged view A of the present invention;

[0030] Figure 4 is the cross-sectional view of the closing mechanism of the present invention;

[0031] Figure 5 is the structure diagram of the plugging assembly of the present invention;

[0032] Figure 6 is the structure diagram of the discharge mechanism of the present invention;

[0033] Figure 7 is the cross-sectional view of the discharge mechanism of the present invention;

[0034] Figure 8 is the structure diagram of the deodorizing mechanism of the present invention;

[0035] Figure 9 is the cross-sectional view of the deodorizing mechanism of the present invention;

[0036] Figure 10 is the structure diagram of the connection assembly of the present invention;

[0037] Figure 11 Cross-sectional view of the connection component of the present invention;

[0038] Figure 12 Schematic diagram of the use of the present invention;

[0039] Figure 13 Of the present invention Figure 12 Enlarged view of part B in

[0040] Explanation of reference numerals in the drawings:

[0041] 1 valve body, 2 first channel, 3 second channel, 4 third channel, 5 fourth channel, 6 valve cavity, 7 closing mechanism, 8 plugging assembly, 9 discharging mechanism, 10 deodorizing mechanism, 11 valve pipe, 12 lifting rod, 13 ring, 14 spring, 15 first valve flap, 16 first sealing ring, 17 rotating rod, 18 telescopic rod, 19 second valve flap, 20 third sealing ring, 21 fixing plate, 22 slider, 23 second sealing ring, 24 sliding groove, 25 knob, 26 lower opening, 27 lower valve cover, 28 plugging rod, 29 fourth sealing ring, 30 upper opening, 31 upper valve cover, 32 hollow plugging rod, 33 waterproof and breathable membrane, 34 fifth sealing ring, 35 box body, 36 activated carbon adsorption plate, 37 filter screen, 38 connection component, 39 connecting pipe, 40 flange, 41 sewage pipe, 42 sealing plug, 43 sixth sealing ring, 44 transparent observation window. Detailed implementation manners

[0042] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] As Figure 1-2 shown, the present invention provides a lifting slow-closing sound-absorbing check valve, including a valve body 1. A valve cavity 6 is provided at the center inside the valve body 1. One end of the valve body 1 is provided with a first channel 2 and a third channel 4 distributed up and down, and the other end of the valve body 1 is provided with a second channel 3 and a fourth channel 5 distributed up and down. One ends of the first channel 2, the second channel 3, the third channel 4 and the fourth channel 5 are all communicated with the outside, and the other ends of the first channel 2, the second channel 3, the third channel 4 and the fourth channel 5 are all communicated with the inside of the valve cavity 6.

[0044] As Figure 2 shown, two closing mechanisms 7 are provided inside the valve cavity 6, and the two closing mechanisms 7 are respectively arranged at the other ends of the third channel 4 and the fourth channel 5 to close the third channel 4 and the fourth channel 5. Specifically, as Figure 3 , 4As shown, the closing mechanism 7 includes a valve tube 11, a lifting rod 12, a ring 13, a spring 14, a first valve flap 15 and a first sealing ring 16. The valve tube 11 is fixed to the inner wall of the valve chamber 6. The lifting rod 12 is arranged inside the valve tube 11 and the bottom end of the lifting rod 12 extends out of the bottom end of the valve tube 11. The top surface of the lifting rod 12 is flush with the top surface of the valve tube 11. A first valve flap 15 is fixedly arranged at the bottom end of the lifting rod 12. A first sealing ring 16 is fixedly arranged at the bottom end of the first valve flap 15. A ring 13 is fixed to the outer end of the lifting rod 12. The ring 13 is arranged inside the valve tube 11 and can slide up and down along the valve tube 11. The spring 14 is arranged at the outer end of the lifting rod 12, and the spring 14 is arranged between the bottom end of the ring 13 and the inner bottom end of the valve tube 11. Second sealing rings 23 are fixedly arranged at both ends of the valve tube 11, and the two second sealing rings 23 are respectively sleeved on the outer end of the lifting rod 12. The second sealing rings 23 are used to prevent fluid from entering the inside of the valve tube 11.

[0045] The first valve flap 15 on the closing mechanism 7 at the other end of the third channel 4 is arranged at the top of the third channel 4, and the first sealing ring 16 at the bottom end of the first valve flap 15 seals the other end of the third channel 4. The first valve flap 15 on the closing mechanism 7 at the other end of the fourth channel 5 is arranged at the top of the fourth channel 5, and the first sealing ring 16 at the bottom end of the first valve flap 15 seals the other end of the fourth channel 5.

[0046] A plugging assembly 8 is arranged inside the valve chamber 6, and the plugging assembly 8 is arranged above the closing mechanism 7. Specifically, as Figure 3 、 5 shown, the plugging assembly 8 includes a rotating rod 17 arranged on the inner wall of the valve chamber 6 through a rotating shaft. Telescopic rods 18 are fixedly arranged on both sides of the rotating rod 17. Second valve flaps 19 are arranged at the ends of the two telescopic rods 18 away from the rotating rod 17. The telescopic rods 18 are rotatably connected to the second valve flaps 19. Third sealing rings 20 are fixedly arranged at the tops of the two second valve flaps 19. The bottom end of the left second valve flap 19 is arranged at the top of the valve tube 11 of the closing mechanism 7 at the other end of the third channel 4, and the left second valve flap 19 is directly below the other end of the first channel 2. The bottom end of the right second valve flap 19 is arranged directly above the valve tube 11 of the closing mechanism 7 at the other end of the fourth channel 5, and the right second valve flap 19 is at the bottom of the other end of the second channel 3. The third sealing ring 20 on the right second valve flap 19 seals the other end of the second channel 3.

[0047] In order to guide the up and down movement of the second valve flap 19, as Figure 3 、 5As shown in the figure, fixing plates 21 are provided on the left side of the second valve flap 19 on the left and on the right side of the second valve flap 19 on the right. Both fixing plates 21 are fixed to the inner wall of the valve chamber 6, and sliding grooves 24 are formed at the front ends of both fixing plates 21. Sliders 22 are fixed on the left side of the second valve flap 19 on the left and on the right side of the second valve flap 19 on the right. One ends of the two sliders 22 away from the second valve flap 19 are respectively slidably connected inside the two sliding grooves 24. The sliders 22 can slide up and down along the fixing plates 21 to guide the up and down movement of the second valve flap 19.

[0048] To facilitate the observation of the inside of the valve body 1, as Figure 1 shown, a transparent observation window 44 is inlaid at the front end of the valve body 1. The front end of the rotating shaft on the rotating rod 17 penetrates through the transparent observation window 44 and extends out of the front end of the valve body 1, and the rotating shaft is connected to the transparent observation window 44 through a sealed bearing. To facilitate the fixation of the rotating rod 17, a knob 25 is fixedly provided at the front end of the rotating shaft, and the knob 25 is locked to the front end of the transparent observation window 44 through a bolt.

[0049] As Figure 2 、 3 shown, the second channel 3 is closed by the second valve flap 19 on the right. At the same time, the second valve flap 19 on the left presses down the lifting rod 12 on the left closing mechanism 7, so that the left closing mechanism 7 cannot be opened. Therefore, the third channel 4 is closed by the left closing mechanism 7.

[0050] When the fluid is conveyed from right to left, the pressure of the fluid impacts the first valve flap 15 of the right closing mechanism 7, causing the first valve flap 15 to move upward, driving the lifting rod 12 and the circular ring 13 to rise, opening the fourth channel 5. Then the fluid can only flow out through the first channel 2. When the fluid stops being conveyed, the lifting rod 12, the circular ring 13 and the first valve flap 15 descend to close the fourth channel 5 to prevent the fluid from flowing back. At the same time, the circular ring 13 descends and contacts the spring 14, squeezing the spring 14. The elastic force generated by the spring 14 creates a resistance to the descent of the circular ring 13, causing the circular ring 13 to descend slowly, preventing the first valve flap 15 from descending too quickly and colliding with the valve body 1, resulting in damage and low noise.

[0051] As Figure 12 、 13 shown, when the fluid is conveyed from left to right, loosen the bolt on the knob 25 to release the fixation of the knob 25. Then rotate the knob 25 to drive the rotating shaft on the rotating rod 17 and the rotating rod 17 to rotate, thereby driving the telescopic rod 18 to rotate. The rotation of the telescopic rod 18 causes the second valve flap 19 on the left to rise to close the first channel 2. At the same time, the second valve flap 19 on the right descends to press down the lifting rod 12 on the right closing mechanism 7, so that the fourth channel 5 is closed by the right closing mechanism 7. Then tighten the bolt on the knob 25 to fix the knob 25, the rotating rod 17, the telescopic rod 18, and the second valve flap 19.

[0052] When the fluid flows from left to right, the fluid causes the first valve flap 15, the lifting rod 12, and the circular ring 13 of the left-side closing mechanism 7 to rise, the third channel 4 is opened, and the fluid flows out through the second channel 3. When the fluid transportation stops, the lifting rod 12, the circular ring 13, and the first valve flap 15 descend to close the third channel 4, preventing the fluid from flowing back. At the same time, when the circular ring 13 falls, it is blocked by the spring 14, causing the first valve flap 15 to descend slowly, preventing the first valve flap 15 from hitting and damaging the valve body 1 too quickly, and with low noise.

[0053] In summary, the present invention has the following advantages: 1. It has a slow-closing function, preventing the first valve flap 15 from being damaged due to hitting the valve body 1 too quickly during descent, and with low noise; 2. It has a two-way anti-backflow function adapted to the fluid flow direction. When the fluid flow direction in the pipeline changes, there is no need to disassemble and reinstall, and it has a wide range of applications.

[0054] As Figure 1-2 shown, a lower opening 26 is provided at the bottom end of the valve body 1. The lower opening 26 is located between the third channel 4 and the fourth channel 5, and the lower opening 26 is provided at the bottom end of the valve cavity 6 and is in communication with the inside of the valve cavity 6. A discharge mechanism 9 is provided at the bottom end of the valve body 1. Specifically, as Figure 6 、 7 shown, the discharge mechanism 9 includes a lower valve cover 27, a plugging rod 28, and a fourth sealing ring 29. The lower valve cover 27 is fixed to the bottom end of the valve body 1. The plugging rod 28 passes through the lower valve cover 27 and is threadedly connected to the lower valve cover 27. The top end of the plugging rod 28 is inserted into the lower opening 26 to plug the lower opening 26. The fourth sealing ring 29 is sleeved outside the plugging rod 28, and the fourth sealing ring 29 is provided between the lower valve cover 27 and the valve body 1. Rotating and opening the plugging rod 28 facilitates the residual fluid in the valve cavity 6 to be discharged through the lower opening 26.

[0055] As Figure 1-2 shown, an upper opening 30 is provided at the top end of the valve body 1. The upper opening 30 is located between the first channel 2 and the second channel 3, and the upper opening 30 is provided at the top end of the valve cavity 6 and is in communication with the inside of the valve cavity 6. An odor removal mechanism 10 is provided at the top end of the valve body 1. Specifically, as Figure 8 、 9As shown, the odor removal mechanism 10 includes an upper valve cover 31 fixed to the top end of the valve body 1. A hollow plug rod 32 is fixedly provided at the bottom end of the upper valve cover 31. A waterproof and breathable membrane 33 is fixedly provided at the bottom end of the hollow plug rod 32 (Principle of the waterproof and breathable membrane 33: Gas particles are very small. According to the principle of capillary movement, they can smoothly penetrate into the capillary to the other side. However, water droplet particles are larger. Due to the surface tension of the water droplets (the water molecules "pull and counteract" each other), the water molecules cannot smoothly penetrate to the other side, that is, the penetration of water is prevented). A fifth sealing ring 34 is sleeved on the top of the outer end of the hollow plug rod 32. A box body 35 with a box cover at the top is fixed to the top end of the upper valve cover 31. The box body 35 is internally communicated with the hollow plug rod 32. A multi-layer activated carbon adsorption plate 36 is provided inside the box body 35. The fluid remaining in the valve cavity 6 will produce an odor after being accumulated for a long time. The odor flows upward and is adsorbed by the activated carbon adsorption plate 36 to achieve the effect of deodorization.

[0056] As Figure 2 shown, filter nets 37 are fixedly provided inside both ends of the valve body 1. The left filter net 37 is arranged at one end of the first channel 2 and the third channel 4, and the right filter net 37 is arranged at one end of the second channel 3 and the fourth channel 5. The filter nets 37 are used to filter impurities in the fluid.

[0057] As Figure 1-2 shown, connection components 38 are provided at both ends of the valve body 1. Specifically, as Figure 10 、 11 shown, both connection components 38 include a connecting pipe 39 bent into an arc shape and flanges 40 fixedly provided at both ends of the connecting pipe 39. The flange 40 close to the valve body 1 is fixedly connected to the valve body 1. A sewage discharge pipe 41 is fixedly provided at the bottom end of the connecting pipe 39. A sealing plug 42 is threadedly connected inside the sewage discharge pipe 41, and the bottom end of the sealing plug 42 extends out of the bottom end of the sewage discharge pipe 41. A sixth sealing ring 43 is provided between the sewage discharge pipe 41 and the sealing plug 42. The filtered impurities are deposited in the connecting pipe 39. Opening the sealing plug 42 facilitates the discharge of the impurities.

[0058] Only some exemplary embodiments of the present invention have been described by way of illustration above. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A lifting slow-closing silencing check valve, comprising a valve body (1), characterized in that: A valve cavity (6) is provided at the center inside the valve body (1). One end of the valve body (1) is provided with a first passage (2) and a third passage (4) which are distributed up and down, and the other end of the valve body (1) is provided with a second passage (3) and a fourth passage (5) which are distributed up and down. One ends of the first passage (2), the second passage (3), the third passage (4) and the fourth passage (5) are all communicated with the outside, and the other ends of the first passage (2), the second passage (3), the third passage (4) and the fourth passage (5) are all communicated with the inside of the valve cavity (6). Two closing mechanisms (7) are provided inside the valve cavity (6), and the two closing mechanisms (7) are respectively arranged at the other ends of the third passage (4) and the fourth passage (5) to close the third passage (4) and the fourth passage (5). A plugging assembly (8) is provided inside the valve cavity (6), and the plugging assembly (8) is arranged above the closing mechanism (7). A discharge mechanism (9) is provided at the bottom end of the valve body (1), and an odor removal mechanism (10) is provided at the top end of the valve body (1). The closing mechanism (7) includes a valve pipe (11), a lifting rod (12), a ring (13), a spring (14), a first valve flap (15) and a first sealing ring (16). The valve pipe (11) is fixed on the inner wall of the valve cavity (6). The lifting rod (12) is arranged inside the valve pipe (11), and the bottom end of the lifting rod (12) extends out of the bottom end of the valve pipe (11). The top surface of the lifting rod (12) is flush with the top surface of the valve pipe (11). A first valve flap (15) is fixedly provided at the bottom end of the lifting rod (12). A first sealing ring (16) is fixedly provided at the bottom end of the first valve flap (15). A ring (13) is fixedly provided at the outer end of the lifting rod (12). The ring (13) is arranged inside the valve pipe (11) and can slide up and down along the valve pipe (11). The spring (14) is arranged at the outer end of the lifting rod (12), and the spring (14) is arranged between the bottom end of the ring (13) and the inner bottom end of the valve pipe (11). Second sealing rings (23) are fixedly provided at both ends of the valve pipe (11), and the two second sealing rings (23) are respectively sleeved on the outer end of the lifting rod (12). The first valve flap (15) on the closing mechanism (7) at the other end of the third passage (4) is arranged at the top of the third passage (4), and the first sealing ring (16) at the bottom end of the first valve flap (15) closes the other end of the third passage (4). The first valve flap (15) on the closing mechanism (7) at the other end of the fourth passage (5) is arranged at the top of the fourth passage (5), and the first sealing ring (16) at the bottom end of the first valve flap (15) closes the other end of the fourth passage (5). The plugging assembly (8) includes a rotating rod (17) arranged on the inner wall of the valve cavity (6) through a rotating shaft. Expansion rods (18) are fixedly provided on both sides of the rotating rod (17). Second valve flaps (19) are provided at the ends of the two expansion rods (18) far away from the rotating rod (17). The expansion rods (18) are rotatably connected with the second valve flaps (19). Third sealing rings (20) are fixedly provided at the top ends of the two second valve flaps (19). The bottom end of the second left valve flap (19) is provided at the top end of the valve pipe (11) of the closing mechanism (7) at the other end of the third channel (4), and the second left valve flap (19) is directly below the other end of the first channel (2). The bottom end of the second right valve flap (19) is provided directly above the valve pipe (11) of the closing mechanism (7) at the other end of the fourth channel (5), and the second right valve flap (19) is at the bottom of the other end of the second channel (3). The third sealing ring (20) on the second right valve flap (19) seals the other end of the second channel (3). Fixing plates (21) are provided on the left side of the second left valve flap (19) and the right side of the second right valve flap (19). Both fixing plates (21) are fixed to the inner wall of the valve cavity (6). Slide grooves (24) are provided at the front ends of both fixing plates (21). Sliders (22) are fixed on the left side of the second left valve flap (19) and the right side of the second right valve flap (19). One ends of the two sliders (22) away from the second valve flap (19) are respectively slidably connected inside the two slide grooves (24). The sliders (22) slide up and down along the fixing plates (21) to guide the up and down movement of the second valve flap (19). A transparent observation window (44) is inlaid at the front end of the valve body (1). The front end of the rotating shaft on the rotating rod (17) penetrates through the transparent observation window (44) and extends out of the front end of the valve body (1). The rotating shaft is connected to the transparent observation window (44) through a sealing bearing. A knob (25) is fixed to the front end of the rotating shaft. The knob (25) is locked to the front end of the transparent observation window (44) through a bolt. Loosen the bolt on the knob (25) to release the fixation of the knob (25), then rotate the knob (25) to drive the rotating shaft on the rotating rod (17) and the rotating rod (17) to rotate, thereby driving the telescopic rod (18) to rotate. The rotation of the telescopic rod (18) causes the second valve flap (19) on the left to rise to seal the first channel (2), and at the same time the second valve flap (19) on the right to descend to press the lifting rod (12) on the right closing mechanism (7), so that the fourth channel (5) is sealed by the right closing mechanism (7). Then tighten the bolt on the knob (25) to fix the knob (25), the rotating rod (17), the telescopic rod (18), and the second valve flap (19).

2. The lift type slow-closing silencing check valve according to claim 1, characterized in that: A lower opening (26) is provided at the bottom end of the valve body (1). The lower opening (26) is located between the third channel (4) and the fourth channel (5), and the lower opening (26) is provided at the bottom end of the valve cavity (6) and is communicated with the inside of the valve cavity (6). The discharging mechanism (9) includes a lower valve cover (27), a plugging rod (28), and a fourth sealing ring (29). The lower valve cover (27) is fixed to the bottom end of the valve body (1). The plugging rod (28) penetrates through the lower valve cover (27) and is threadedly connected to the lower valve cover (27). The top end of the plugging rod (28) is inserted into the lower opening (26) to plug the lower opening (26). The fourth sealing ring (29) is sleeved on the outside of the plugging rod (28), and the fourth sealing ring (29) is provided between the lower valve cover (27) and the valve body (1).

3. The lift type slow-closing silencing check valve according to claim 1, characterized in that: The top end of the valve body (1) is provided with an upper opening (30). The upper opening (30) is arranged between the first channel (2) and the second channel (3), and is located at the top end of the valve cavity (6) and communicates with the inside of the valve cavity (6). The odor removal mechanism (10) includes an upper valve cover (31) fixed to the top end of the valve body (1). A hollow plug rod (32) is fixedly arranged at the bottom end of the upper valve cover (31). A waterproof and breathable membrane (33) is fixedly arranged at the bottom end of the hollow plug rod (32). A fifth sealing ring (34) is sleeved on the outer top end of the hollow plug rod (32). A box body (35) with a box cover at the top end is fixed to the top end of the upper valve cover (31). The box body (35) communicates with the inside of the hollow plug rod (32). A plurality of activated carbon adsorption plates (36) are arranged inside the box body (35).

4. A lifting slow-closing silencing check valve according to claim 1, characterized in that: Filter meshes (37) are fixedly arranged inside both ends of the valve body (1). The left filter mesh (37) is arranged at one end of the first channel (2) and the third channel (4), and the right filter mesh (37) is arranged at one end of the second channel (3) and the fourth channel (5).

5. A lifting slow-closing sound-absorbing check valve according to claim 1, characterized in that: Connection components (38) are arranged at both ends of the valve body (1). Both connection components (38) include a connecting pipe (39) bent into an arc shape and flanges (40) fixedly arranged at both ends of the connecting pipe (39). The flange (40) close to the valve body (1) is fixedly connected to the valve body (1). A sewage discharge pipe (41) is fixedly arranged at the bottom end of the connecting pipe (39). A sealing plug (42) is threadedly connected inside the sewage discharge pipe (41), and the bottom end of the sealing plug (42) extends out of the bottom end of the sewage discharge pipe (41). A sixth sealing ring (43) is arranged between the sewage discharge pipe (41) and the sealing plug (42).

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