Bidirectional sealing check valve

Abstract

The invention relates to a bidirectional sealing check valve, which belongs to the technical field of valves, and comprises a check valve consisting of a valve seat, a valve pipe and a valve, the lower surface of the valve pipe is fixedly communicated with a drain pipe, and a drain hole communicated with the drain pipe is formed in the valve pipe; a sealing structure for sealing the drain hole is arranged in the valve pipe, and a connecting structure for linkage of the valve and the sealing structure is arranged in the valve pipe. A jacking structure used in cooperation with the sealing structure is arranged in the discharge pipe, and a communicating pipe is arranged between the valve seat and the jacking structure. According to the two-way sealing check valve, two-way sealing of the valve seat and the drain pipe is achieved through the valve and the sealing structure, and the water flow driving and connecting rod transmission mechanism modes are combined; the device has the advantages and advantages of efficient sealing and discharging, simplicity and convenience in operation, automation, strong adaptability, high reliability, convenience in maintenance, low cost, energy conservation, environmental protection, sustainability, improvement of production efficiency and economic benefits and the like.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a bidirectional sealing check valve. Background Art

[0002] A check valve, also known as a non-return valve, one-way valve, reflux valve or isolation valve, is a valve with a circular opening and closing part that blocks the backflow of the medium by its own weight and the pressure of the medium. Its main function is to allow the fluid to flow in one direction only. When the fluid flows back, the valve disc will automatically close, thereby cutting off the flow path and preventing damage caused by the backflow. The working principle of the check valve is to rely on the weight of the opening and closing part and the pressure of the medium to achieve automatic opening and closing. When the medium flows in from the inlet end, the valve disc is pushed open by the pressure of the medium, and the medium can flow; when the inlet pressure is less than the sum of the weight of the valve disc and its flow resistance, or when the medium flows back, the valve disc will close under the dual action of its own weight and the pressure of the backflow medium to prevent the backflow of the medium.

[0003] Chinese patent CN205371719 U discloses "a two-way check valve installed on a pipeline. It is mainly designed to solve the problem that the existing check valves installed on pipelines are all one-way check valves and have a limited scope of use. It includes a valve body, one end of the valve body has a water inlet, the other end of the valve body has a water outlet, a raft is arranged in the valve body at the water inlet, one end of the raft is installed on a pin support through a pin, the pin support is fixed to the valve body, a drain pipe is arranged obliquely above the raft, the drain pipe is fixed to the valve body and extends out of the valve body, and the outer end of the drain pipe has a drain port. The advantage is that the structure is simple, and it has a drain function while having a check function, which can prevent the exposed pipes from freezing in winter."

[0004] The above patent has the following shortcomings: in order to discharge the water remaining in the valve body, a drain pipe is arranged on the valve body. However, the drain pipe lacks a sealing structure when in use, which makes it difficult to stop the valve body and automatically drain the drain pipe.

[0005] Therefore, it is urgent to improve the above patent to solve the above problems. Summary of the invention

[0006] In view of the shortcomings of the existing technology, two-way sealing of the valve seat and the discharge pipe is achieved through valves and sealing structures, and combined with a series of mechanical linkages and water flow control mechanisms, it brings about many beneficial effects such as efficient two-way sealing performance, optimized fluid management, enhanced structural stability and reliability, easy installation and maintenance, and improved system safety.

[0007] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the present invention includes: a two-way sealing check valve, including a check valve composed of a valve seat, a valve pipe and a valve, the lower surface of the valve pipe is fixedly connected with a drain pipe, and a drain hole connected with the drain pipe is opened inside the valve pipe, so that excess water or other media in the valve pipe can be discharged smoothly, avoiding the problem of water accumulation or medium residue, wherein the drain hole is a circular hole and is vertically arranged; both ends of the valve seat are welded with connecting flanges, and the connecting flanges are provided with docking holes, the connecting flanges are circular in shape, and the setting of the docking holes can facilitate the docking installation of the valve seat; The valve tube is provided with a sealing structure for sealing the drain hole, and the valve tube is provided with a connecting structure for linking the valve and the sealing structure; A lifting structure used in conjunction with a sealing structure is arranged in the discharge pipe, and a connecting pipe is arranged between the valve seat and the lifting structure.

[0008] This application adopts the above-mentioned technical solution to achieve two-way sealing of the valve seat and the discharge pipe through the valve and sealing structure, and combines the water flow drive and connecting rod transmission mechanism to bring many benefits and advantages such as efficient sealing and discharge, simple operation and automation, strong adaptability and high reliability, convenient maintenance and low cost, energy saving, environmental protection and sustainability, and improved production efficiency and economic benefits.

[0009] Preferably, the number of the valve seats is two, the valve pipe is fixedly connected between the two valve seats, and the valve is arranged at one end of the valve pipe and is tightly connected to one of the valve seats.

[0010] The beneficial effect of adopting the above further solution is that the double valve seat structure provides an additional support point when the valve is closed, which helps to enhance the stability of the entire valve system, helps to reduce vibration and noise caused by medium pressure fluctuations or temperature changes, and improves the operating efficiency of the system.

[0011] Preferably, the valve comprises a valve cover, a sealing block and a buffer gasket, wherein the sealing block is fixed to a side of the valve cover close to the valve seat, and the buffer gasket is sleeved and installed on the outer surface of the sealing block to achieve a tight connection with the valve.

[0012] The beneficial effect of adopting the above further scheme is: by fixing the sealing block to the side of the valve cover close to the valve seat, an effective sealing surface can be formed between the sealing block and the valve seat to prevent medium leakage. At the same time, the sleeve installation of the buffer gasket further enhances the sealing effect, because the buffer gasket has a certain elasticity and deformation ability, which can fill the tiny gap between the sealing surfaces and improve the tightness and reliability of the seal.

[0013] Preferably, a guide rod and a third return spring are fixedly installed on one side of the valve seat close to the valve, the other end of the third return spring is fixed to the outer surface of the valve cover, and a through hole is opened inside the valve cover, and the guide rod passes through the inside of the valve cover through the through hole.

[0014] The beneficial effect of adopting the above further scheme is: the presence of the third return spring enables the valve to automatically return to its original position when closed, ensuring close contact between the valve and the valve seat, thereby improving the stability of the seal, and also having a buffering effect. When the valve is subjected to fluid impact or external force, the third return spring can absorb part of the impact force, play a buffering role, and protect the valve from damage.

[0015] Preferably, the connecting structure includes a swing arm, a rotating shaft, a first connecting rod and a second connecting rod, wherein the first connecting rod and the second connecting rod are hinged at opposite ends to the upper and lower ends of the swing arm respectively, and the other end of the first connecting rod is hinged to the side of the valve cover away from the valve seat.

[0016] The beneficial effects of adopting the above further scheme are: Preferably, one end of the rotating shaft is connected to the internal bearing of the swing arm, and the other end of the rotating shaft is fixed to the inner wall of the valve tube, and the first connecting rod and the second connecting rod are arranged in parallel.

[0017] The beneficial effect of adopting the above further solution is that the first connecting rod and the second connecting rod are arranged in parallel, and this structure enables the valve and the sealing structure to remain stable during the movement, reducing the vibration and noise caused by unstable movement. The other end of the second connecting rod is hinged to the top of the telescopic sleeve. The components are connected in an articulated manner. This structure has good durability and fatigue resistance, and can withstand long-term use and frequent opening / closing operations.

[0018] Preferably, the sealing structure comprises a telescopic sleeve and a telescopic tube which are telescopically connected, and a first return spring which is fixedly mounted on the end of the telescopic tube and fixed to the inner wall of the telescopic sleeve, and the other end of the second connecting rod is hinged to the top end of the telescopic sleeve.

[0019] The beneficial effect of adopting the above further solution is that the sealing plug is extended into the drain hole through the deformation of the first return spring, thereby achieving sealing of the drain pipe.

[0020] Preferably, a circular block is fixedly connected to one end of the telescopic tube away from the telescopic sleeve, a sealing plug tightly matched with the drain hole is installed on the bottom side of the circular block, and a limiting rod guiding the telescopic sleeve is installed on the inner side of the valve seat; Among them, a limiting ear which is connected and matched with the limiting rod is fixed on the outer surface of the telescopic sleeve, a sheath is fixed on the inner side of the limiting ear, and the limiting rod passes through the sheath.

[0021] The beneficial effect of adopting the above further scheme is that the combination of the limit rod, the limit ear and the sleeve plays a vital role in the design of the sealing structure inside the valve tube, which not only improves the sealing effect, but also enhances the stability of the structure and the convenience of maintenance, providing a strong guarantee for the long-term stable operation of the valve.

[0022] Preferably, the lifting structure includes a piston that reciprocates against the inside of the discharge pipe, a bracket fixedly installed on the inner side of the bottom end of the discharge pipe, a sealing rod and a second return spring fixedly installed on the upper surface of the bracket, and a lifting rod that is detachably installed on the top of the piston and abuts against the lower surface of the sealing plug.

[0023] The beneficial effect of adopting the above further scheme is: through the precise control of the jacking structure, precise regulation of the fluid flow can be achieved. When the fluid needs to be discharged, the piston descends and opens the discharge channel; when the discharge needs to be stopped, the piston rises and closes the discharge channel, thereby achieving the advantage of optimized fluid management.

[0024] Preferably, the other end of the second return spring is fixed to the lower surface of the piston, a sealing hole adapted to the sealing rod is provided inside the piston, a second connecting hole connected to one end of the connecting pipe is provided inside the valve seat, and a first connecting hole connected to the other end of the connecting pipe is provided on the side wall of the discharge pipe and above the piston.

[0025] The beneficial effect of adopting the above further scheme is: by supplying water into the valve tube, the water flows into the valve seat and pushes the valve open by the impact force, and at the same time a part of the water flows into the connecting pipe through the second connecting hole, and the water flows into the connecting pipe eventually enters the discharge pipe, and the piston moves downward by the impact of the water flow, and the downward movement of the piston drives the push rod to extend into the discharge pipe, and the sealing rod seals the sealing hole.

[0026] The present invention has at least the following beneficial effects: 1. The two-way sealing check valve realizes two-way sealing of the valve seat and the discharge pipe through the valve and sealing structure, and combines the water flow drive and connecting rod transmission mechanism to bring many benefits and advantages such as efficient sealing and discharge, simple and automatic operation, strong adaptability and high reliability, convenient maintenance and low cost, energy saving, environmental protection and sustainability, as well as improved production efficiency and economic benefits.

[0027] 2. It has the advantage of fast discharge. It uses water flow to enter the valve seat and relies on the impact to push the valve open. No additional power source is required. It is easy to operate and energy-saving and environmentally friendly. When the water supply is stopped, the excess water in the valve pipe can be quickly discharged through the drain hole and the drain pipe, avoiding the waste of water resources and the problem of water accumulation in the pipeline system, and reducing the risk of environmental pollution and ecological damage.

[0028] 3. The two-way sealing check valve is driven by a connecting rod: the valve displacement is driven by the connecting rod and the swing arm, which realizes the precise control of the sealing structure, making the whole operation process more automated and efficient. The valve is connected to the swing arm by the first connecting rod. When the valve is opened or closed, the rotation angle of the swing arm can be precisely controlled, and then the sealing structure is driven to move by the second connecting rod, realizing the linkage between the valve and the sealing structure.

[0029] 4. The bidirectional sealing check valve adopts a connection structure including a swing arm, a rotating shaft, a first connecting rod and a second connecting rod to realize the linkage between the valve and the sealing structure, which brings many benefits such as efficient linkage mechanism, enhanced structural stability and reliability, improved sealing performance, easy installation and maintenance, and strong adaptability.

[0030] 5. The two-way sealing check valve relies on the impact of water flow to move the piston downward, and the downward movement of the piston drives the push rod to extend into the discharge pipe, and the sealing rod blocks the sealing hole. When the sealing structure is displaced a certain distance, the sealing plug is extended into the discharge hole through the deformation of the first spring to achieve the sealing of the discharge pipe. When the water supply is stopped, the piston moves upward to lift the sealing plug through the push rod, and the third reset spring is used in conjunction with the use of the connecting structure to restore the valve and the sealing structure to their original state. At this time, the excess water in the valve pipe is discharged through the discharge hole and the discharge pipe, achieving the advantage of automatic discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural front view of the bidirectional sealing check valve of the present invention; Figure 2 It is a cross-sectional view of the overall structure of the bidirectional sealing check valve of the present invention; Figure 3 It is a cross-sectional view of the valve tube structure of the bidirectional sealing check valve of the present invention; Figure 4 It is a schematic diagram of the valve structure of the bidirectional sealing check valve of the present invention; Figure 5 for Figure 2 A is a schematic diagram of the enlarged structure shown; Figure 6 It is a structural schematic diagram of the second connecting hole of the bidirectional sealing check valve of the present invention; Figure 7 It is a structural schematic diagram of the connection structure of the bidirectional sealing check valve of the present invention; Figure 8 It is a structural cross-sectional view of the sealing structure of the bidirectional sealing check valve of the present invention; Fig. 9 It is a schematic diagram of the overall structure of the lifting structure of the bidirectional sealing check valve of the present invention; Fig.10 It is a schematic structural diagram of the lifting structure of the bidirectional sealing check valve of the present invention; Fig.11 A front view of the valve tube structure of the bidirectional sealing check valve of the present invention; Fig.12 It is a front view of the sheath structure of the bidirectional sealing check valve of the present invention.

[0032] In the figure: 1. valve seat; 2. valve pipe; 3. valve; 31. valve cover; 32. sealing block; 33. buffer pad; 34. perforation; 4. drain pipe; 41. drain hole; 5. connecting structure; 501. swing arm; 502. rotating shaft; 503. first connecting rod; 504. second connecting rod; 6. sealing structure; 601. telescopic sleeve; 602. telescopic tube; 603. first return spring; 604. circular block; 605. sealing plug; 7. connecting pipe; 8. lifting structure; 801. piston; 802. bracket; 803. second return spring; 804. push rod; 805. sealing hole; 806. first connecting hole; 807. sealing rod; 9. second connecting hole; 10. guide rod; 11. third return spring; 12. limit rod; 13. limit ear; 14. sleeve. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0034] like Figure 1 - Figure 4 and Fig.11As shown, the modified two-way sealing check valve provided in this embodiment includes a check valve composed of a valve seat 1, a valve tube 2 and a valve 3. The lower surface of the valve tube 2 is fixedly connected with a drain pipe 4, and a drain hole 41 connected with the drain pipe 4 is provided inside the valve tube 2; so that the excess water or other medium in the valve tube 2 can be discharged smoothly, avoiding the problem of water accumulation or medium residue. Among them, the drain hole 41 is a circular hole, and it is vertically arranged to ensure that the medium can be discharged smoothly; connecting flanges are welded at both ends of the valve seat 1, and docking holes are provided in the connecting flanges. The connecting flanges are circular in shape, and the setting of the docking holes can facilitate the docking of the valve seat 1. Two valve seats 1 are installed, and the valve tube 2 is fixedly connected between the two valve seats 1. The valve 3 is arranged at one end of the valve tube 2 and is tightly connected to one of the valve seats 1. The valve 3 includes a valve cover 31, a sealing block 32 and a buffer pad 33. The sealing block 32 is fixed to one side of the valve cover 31 close to the valve seat 1, and the buffer pad 33 is sleeved and installed on the outer surface of the sealing block 32 to achieve a tight connection with the valve 3. The combination of the sealing block 32 and the buffer pad 33: the sealing block 32 is fixed to one side of the valve cover 31, and the buffer pad 33 is sleeved and installed on the outer surface of the sealing block 32, which not only enhances the tightness of the seal, but also improves the durability and wear resistance of the valve 3. There are two valves 3, and another valve 3 is elastically hinged and installed on another valve seat 1. It can achieve sealing of the fluid in two directions, effectively prevent the backflow of the medium, and ensure the stability and safety of the system.

[0035] It can be understood that the check valve has a compact structure design and is easy to install and disassemble, which reduces the difficulty and cost of installation and maintenance, and because key components such as the valve 3 and the valve seat 1 are easily accessible, they can be easily inspected, repaired and replaced, ensuring the long-term stable operation of the valve 3. Key components such as the valve seat 1, the valve pipe 2 and the valve 3 are made of high-quality stainless steel or corrosion-resistant alloy materials to ensure that the valve body can still maintain good corrosion resistance and sealing performance under various harsh working conditions.

[0036] In addition, the connection design between the drain hole 41 and the drain pipe 4 enables the valve pipe 2 to automatically discharge excess water or other media after the medium stops flowing, effectively avoiding the problem of water accumulation or residual media. This not only reduces the corrosion of the valve 3 by the medium, but also avoids valve jamming or failure caused by residual media. Water accumulation or residual media may cause pressure fluctuations in the pipeline system, thereby affecting the stability of the system. By discharging excess media in a timely manner, the two-way sealing check valve helps maintain the pressure balance of the pipeline system and improve the overall stability of the system.

[0037] like Figure 5As shown, a guide rod 10 and a third return spring 11 are fixedly installed on one side of the valve seat 1 close to the valve 3. The existence of the third return spring 11 enables the valve 3 to automatically return to its original position when closed, ensuring close contact between the valve 3 and the valve seat 1, thereby improving the stability of the seal, and also having a buffering effect. When the valve 3 is impacted by fluid or external force, the third return spring 11 can absorb part of the impact force, play a buffering role, and protect the valve 3 from damage. The other end of the third return spring 11 is fixed to the outer surface of the valve cover 31, and a through hole 34 is provided inside the valve cover 31, and the guide rod 10 passes through the inside of the valve cover 31 through the through hole 34. The guide rod 10 passes through the inside of the valve cover 31 through the through hole 34, so that the valve 3 can move smoothly during the opening and closing process, reducing the friction and wear between the valve 3 and the valve seat 1, and at the same time improving the service life. Due to the reduction of wear, the service life of the valve 3 is extended, and the frequency of replacing the valve 3 and the maintenance cost are reduced.

[0038] In addition, the guide rod 10 not only supports the valve 3, but also ensures that the valve 3 can move along the correct trajectory during the opening and closing process, thereby avoiding the misalignment or jamming of the valve 3. Since the valve 3 can be opened and closed smoothly and accurately, the flow efficiency of the fluid is improved, and the energy consumption and fluid resistance are reduced. Since the valve 3 can be tightly closed and automatically reset, it can effectively prevent accidental leakage of the medium, thereby improving the safety of the system.

[0039] like Figure 2 and Figure 8 and Fig.12 As shown, a sealing structure 6 for sealing the drain hole 41 is arranged inside the valve tube 2, and the sealing structure 6 includes a telescopic sleeve 601 and a telescopic tube 602 which are telescopically connected, and a first return spring 603 which is fixedly installed at the end of the telescopic tube 602 and fixed to the inner wall of the telescopic sleeve 601. Among them, a circular block 604 is fixedly connected to one end of the telescopic tube 602 away from the telescopic sleeve 601, and a sealing plug 605 which is tightly matched with the drain hole 41 is installed on the bottom side of the circular block 604, and a limiting rod 12 which guides the telescopic sleeve 601 is installed on the inner side of the valve seat 1. The limiting rod 12 can guide the sealing structure 6 to make it linearly displaced. The length of the limiting rod 12 is adapted to the moving distance of the sealing structure 6.

[0040] The outer surface of the telescopic sleeve 601 is fixed with a stop ear 13 that is connected with the stop rod 12, and the inner side of the stop ear 13 is fixed with a sheath 14, and the stop rod 12 passes through the sheath 14. The design of the sealing structure 6 inside the valve tube 2 and the combination of the stop rod 12, the stop ear 13 and the sheath 14 bring multiple benefits: It not only has the advantage of guiding stability: the setting of the limit rod 12 plays a good guiding role for the sealing structure 6 (including the telescopic sleeve 601, the telescopic tube 602 and other components). When the sealing structure 6 performs linear displacement, the limit rod 12 ensures the linearity and stability of its movement, avoiding sealing failure or component damage caused by offset or shaking. It also has the advantage of moving precision: since the length of the limit rod 12 is compatible with the moving distance of the sealing structure 6, this ensures that the sealing structure 6 can accurately reach the predetermined position during the movement, that is, the sealing plug 605 can fit the drain hole 41 tightly to achieve an effective sealing effect.

[0041] At the same time, it has the advantage of structural stability: the interlocking cooperation between the stopper ears 13 on the outer surface of the telescopic sleeve 601 and the stopper rod 12, as well as the fixed installation of the sheath 14, enhances the stability of the entire sealing structure. This design not only improves the stability of the sealing structure 6 during movement, but also increases its ability to resist external interference, making the sealing effect more reliable.

[0042] In addition, the synergistic effect of the stopper rod 12, the stopper ear 13 and the sheath 14 can effectively reduce the friction and wear of the sealing structure 6 during movement, thereby extending its service life. This is of great significance for improving the overall performance of the valve and reducing maintenance costs, thereby extending the service life.

[0043] In summary, the combination of the limit rod 12, the limit ear 13 and the sleeve 14 plays a vital role in the design of the sealing structure 6 inside the valve tube 2, which not only improves the sealing effect, but also enhances the stability and maintenance convenience of the structure, providing a strong guarantee for the long-term stable operation of the valve.

[0044] To realize the linkage between the valve 3 and the sealing structure 6, as Figure 2 , Figure 3 and Figure 7 As shown, a connecting structure 5 is provided inside the valve tube 2 to link the valve 3 with the sealing structure 6; the connecting structure 5 includes a swing arm 501, a rotating shaft 502, a first connecting rod 503 and a second connecting rod 504, and the first connecting rod 503 and the second connecting rod 504 are respectively hinged at the upper and lower ends of the swing arm 501 at opposite ends, and the other end of the first connecting rod 503 is hinged at the side of the valve cover 31 away from the valve seat 1. The valve 3 is connected to the swing arm 501 through the first connecting rod 503, and when the valve 3 is opened or closed, the rotation angle of the swing arm 501 can be accurately controlled, and then the sealing structure 6 is driven to move through the second connecting rod 504, thereby realizing the linkage between the valve 3 and the sealing structure 6.

[0045] Specifically, one end of the rotating shaft 502 is connected to the internal bearing of the swing arm 501, and the other end of the rotating shaft 502 is fixed to the inner wall of the valve tube 2. The swing arm 501 is connected to the rotating shaft 502 through the bearing, which ensures the stability and reliability of the swing arm 501 during the rotation process and avoids failures caused by loose connection or wear. The first connecting rod 503 and the second connecting rod 504 are arranged in parallel. Since the swing arm 501 is fixed to the inner wall of the valve tube 2 through the rotating shaft 502, and the first connecting rod 503 and the second connecting rod 504 are arranged in parallel, this structure allows the valve 3 and the sealing structure 6 to remain stable during the movement, reducing the vibration and noise caused by unstable movement. The other end of the second connecting rod 504 is hinged to the top of the telescopic sleeve 601. The various components are connected in an articulated manner. This structure has good durability and fatigue resistance and can withstand long-term use and frequent opening / closing operations.

[0046] It can be understood that the connection structure 5 is used to link the valve 3 and the sealing structure 6, which has the advantage of adapting to various working conditions. The connection structure 5 has high adaptability and flexibility, can adapt to different working conditions and medium conditions, and meet the needs of various fluid control systems. At the same time, it is easy to adjust. By adjusting the length or angle of the first connecting rod 503 and the second connecting rod 504, the movement trajectory and displacement of the valve 3 and the sealing structure 6 can be conveniently adjusted to adapt to different application scenarios.

[0047] In summary, the connection structure 5 including the swing arm 501, the rotating shaft 502, the first connecting rod 503 and the second connecting rod 504 is used to realize the linkage between the valve 3 and the sealing structure 6, which brings many benefits such as efficient linkage mechanism, enhanced structural stability and reliability, improved sealing performance, easy installation and maintenance, and strong adaptability. These advantages make the design have broad application prospects and important value in fluid control systems.

[0048] like Figure 2 , Figure 3 , Figure 5 , Figure 6 , Fig. 9 and Fig.10As shown, a lifting structure 8 used in conjunction with the sealing structure 6 is provided in the discharge pipe 4, and a connecting pipe 7 is provided between the valve seat 1 and the lifting structure 8. The design of the connecting pipe 7 forms a pressure balance system between the inside of the valve seat 1 and the discharge pipe 4, which helps to reduce the leakage problem caused by the pressure difference. The lifting structure 8 includes a piston 801 that abuts against the inside of the discharge pipe 4, a bracket 802 fixedly mounted on the inner side of the bottom end of the discharge pipe 4, a sealing rod 807 fixedly mounted on the upper surface of the bracket 802, and a second return spring 803, and a push rod 804 that is detachably mounted on the top of the piston 801 and abuts against the lower surface of the sealing plug 605. There are two push rods 804, which can better and more steadily lift the sealing plug 605. The bracket 802 is fixedly mounted on the inner side of the bottom end of the discharge pipe 4, providing a stable support for the lifting structure 8. The piston 801 abuts against the inside of the discharge pipe 4 reciprocatingly, and forms a dynamic seal with the inner wall of the discharge pipe 4, effectively preventing the medium from leaking from the discharge pipe 4. The length of the push rod 804 can be adjusted to better lift the sealing plug 605.

[0049] Through the precise control of the lifting structure 8, the fluid flow can be precisely regulated. When the fluid needs to be discharged, the piston 801 descends to open the discharge channel; when the discharge needs to be stopped, the piston 801 rises to close the discharge channel, thereby achieving the advantage of optimizing fluid management. This method does not require an additional power source and completely relies on water flow drive and spring reset, thus achieving energy conservation, avoiding the waste of water resources and the problem of water accumulation in the pipeline system, and reducing the risk of environmental pollution and ecological damage.

[0050] like Fig. 9 As shown, the other end of the second return spring 803 is fixed to the lower surface of the piston 801, a sealing hole 805 adapted to the sealing rod 807 is opened inside the piston 801, a second connecting hole 9 connected to one end of the connecting pipe 7 is opened inside the valve seat 1, and a first connecting hole 806 connected to the other end of the connecting pipe 7 is opened on the side wall of the discharge pipe 4 and above the piston 801. The valve seat 1 and the discharge pipe 4 are bidirectionally sealed by the valve 3 and the sealing structure 6. By supplying water to the valve pipe 2, the water flows into the valve seat 1 and pushes the valve 3 open by the impact force. At the same time, a part of the water flows into the connecting pipe 7 through the second connecting hole 9. The water flows into the connecting pipe 7 and finally enters the discharge pipe 4. The piston 801 moves downward by the impact of the water flow. The downward movement of the piston 801 drives the push rod 804 to extend into the discharge pipe 4. The sealing rod 807 blocks the sealing hole 805. When the sealing structure 6 is displaced a certain distance, the sealing plug 605 is extended into the discharge hole 41 by the deformation of the first return spring 603 to achieve the sealing of the discharge pipe 4. When the water supply is stopped, the piston 801 moves upward to lift the sealing plug 605 through the push rod 804. The third return spring 11 is used in conjunction with the connection structure 5 to restore the valve 3 and the sealing structure 6 to their original state. At this time, the excess water in the valve pipe 2 is discharged through the discharge hole 41 and the discharge pipe 4.

[0051] like Figure 1 - Fig.12 As shown, the principle of the bidirectional sealing check valve provided in this embodiment is as follows: When the present invention is used, the valve seat 1 and the discharge pipe 4 are bidirectionally sealed by the valve 3 and the sealing structure 6. By supplying water into the valve pipe 2, the water flows into the valve seat 1 and pushes the valve 3 open by the impact force. At the same time, a part of the water flows into the connecting pipe 7 through the second connecting hole 9. The displacement of the valve 3 drives the swing arm 501 to rotate through the first connecting rod 503. The swing arm 501 rotates through the second connecting rod 504 to drive the sealing structure 6 to move closer to the discharge hole 41. In addition, the water flows into the connecting pipe 7 and finally enters the discharge pipe 4. The piston 801 moves downward by the impact of the water flow. The piston 8 01 moves downward to drive the push rod 804 to extend into the discharge pipe 4, and the sealing rod 807 blocks the sealing hole 805. When the sealing structure 6 is displaced a certain distance, the sealing plug 605 is extended to the discharge hole 41 through the deformation of the first return spring 603, so as to seal the discharge pipe 4. When the water supply is stopped, the piston 801 moves upward to lift the sealing plug 605 through the push rod 804, and the third return spring 11 is used in conjunction with the connection structure 5 to restore the valve 3 and the sealing structure 6 to their original state. At this time, the excess water in the valve tube 2 is discharged through the discharge hole 41 and the discharge pipe 4.

[0052] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0053] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0054] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A two-way sealing check valve, comprising a check valve consisting of a valve seat (1), a valve pipe (2) and a valve (3), characterized in that: The lower surface of the valve tube (2) is fixedly connected to a drain pipe (4), and a drain hole (41) is provided inside the valve tube (2) and is connected to the drain pipe (4), so that excess water or other media in the valve tube (2) can be discharged smoothly, thereby avoiding the problem of water accumulation or media residue, wherein the drain hole (41) is a circular hole and is vertically arranged; connecting flanges are welded at both ends of the valve seat (1), and docking holes are provided inside the connecting flanges. The connecting flanges are circular in shape, and the arrangement of the docking holes facilitates docking installation of the valve seat (1), thereby enhancing the stability and sealing of the connection; A sealing structure (6) for sealing the drain hole (41) is provided inside the valve tube (2), and a connecting structure (5) for linking the valve (3) and the sealing structure (6) is provided inside the valve tube (2); A lifting structure (8) used in conjunction with the sealing structure (6) is provided in the discharge pipe (4), and a connecting pipe (7) is provided between the valve seat (1) and the lifting structure (8).

2. The bidirectional sealing check valve according to claim 1, characterized in that: There are two valve seats (1), the valve pipe (2) is fixedly connected between the two valve seats (1), and the valve (3) is arranged at one end of the valve pipe (2) and is tightly connected to one of the valve seats (1).

3. The bidirectional sealing check valve according to claim 1, characterized in that: The valve (3) comprises a valve cover (31), a sealing block (32) and a buffer pad (33); the sealing block (32) is fixed to a side of the valve cover (31) close to the valve seat (1), and the buffer pad (33) is sleeved and mounted on the outer surface of the sealing block (32) to achieve a tight connection with the valve (3).

4. The bidirectional sealing check valve according to claim 3, characterized in that: A guide rod (10) and a third return spring (11) are fixedly mounted on a side of the valve seat (1) close to the valve (3); the other end of the third return spring (11) is fixed to the outer surface of the valve cover (31); a through hole (34) is provided inside the valve cover (31); and the guide rod (10) passes through the inside of the valve cover (31) through the through hole (34).

5. The bidirectional sealing check valve according to claim 4, characterized in that: The connection structure (5) comprises a swing arm (501), a rotating shaft (502), a first connecting rod (503) and a second connecting rod (504), wherein opposite ends of the first connecting rod (503) and the second connecting rod (504) are respectively hinged to upper and lower ends of the swing arm (501), and the other end of the first connecting rod (503) is hinged to a side of the valve cover (31) away from the valve seat (1).

6. The bidirectional sealing check valve according to claim 5, characterized in that: One end of the rotating shaft (502) is connected to the internal bearing of the swing arm (501), and the other end of the rotating shaft (502) is fixed to the inner wall of the valve tube (2), and the first connecting rod (503) and the second connecting rod (504) are arranged in parallel.

7. The bidirectional sealing check valve according to claim 5, characterized in that: The sealing structure (6) comprises a telescopic sleeve (601) and a telescopic tube (602) that are telescopically connected, and a first return spring (603) fixedly mounted on the end of the telescopic tube (602) and fixed to the inner wall of the telescopic sleeve (601); the other end of the second connecting rod (504) is hinged to the top end of the telescopic sleeve (601).

8. The bidirectional sealing check valve according to claim 7, characterized in that: A circular block (604) is fixedly connected to one end of the telescopic tube (602) away from the telescopic sleeve (601); a sealing plug (605) tightly fitting with the discharge hole (41) is installed on the bottom side of the circular block (604); and a limiting rod (12) guiding the telescopic sleeve (601) is installed on the inner side of the valve seat (1); The outer surface of the telescopic sleeve (601) is fixed with a limiting ear (13) which is interlocked with the limiting rod (12), the inner side of the limiting ear (13) is fixed with a protective sleeve (14), and the limiting rod (12) passes through the protective sleeve (14).

9. The bidirectional sealing check valve according to claim 8, characterized in that: The lifting structure (8) comprises a piston (801) that reciprocates against the inside of the discharge pipe (4), a bracket (802) fixedly mounted on the inner side of the bottom end of the discharge pipe (4), a sealing rod (807) and a second return spring (803) fixedly mounted on the upper surface of the bracket (802), and a lifting rod (804) that is detachably mounted on the top of the piston (801) and abuts against the lower surface of the sealing plug (605).

10. The two-way sealing check valve according to claim 9, characterized in that: The other end of the second return spring (803) is fixed to the lower surface of the piston (801); a sealing hole (805) adapted to the sealing rod (807) is provided inside the piston (801); a second connecting hole (9) connected to one end of the connecting pipe (7) is provided inside the valve seat (1); and a first connecting hole (806) connected to the other end of the connecting pipe (7) is provided on the side wall of the discharge pipe (4) and located above the piston (801).

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