Check valve with high sealing structure

Abstract

The invention discloses a check valve with a high-sealing structure, and relates to the technical field of valves, the check valve comprises a valve body, the valve body is internally provided with a fluid channel, and the valve body is provided with a plugging piece capable of moving up and down to control opening and closing of the fluid channel; the anti-scale part comprises a shielding part which is hermetically attached to the inner wall of the fluid channel and a sliding part which is connected to the inner wall of the valve body in a sliding manner and is connected with the shielding part; the piston piece comprises an air supply part arranged on the top face of the valve body and an air channel formed in the wall face of the valve body and communicated with the air supply part, and the sliding part slides in the air channel in a sealed mode. Through the design of the shielding part and the sliding part of the anti-scaling part, the anti-scaling part can better adapt to the shape of the water inlet flow channel, impurities and scales are effectively blocked, meanwhile, the anti-scaling part and the piston part can automatically adjust the position of the shielding part according to the pressure change in the fluid channel through a linkage mechanism of the gas channel, the timeliness and effectiveness of anti-scaling are improved, and the anti-scaling effect is improved. And therefore, long-term stable operation of the check valve is guaranteed.

Description

Technical Field

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

[0002] As a valve widely used in various fluid conveying systems, the main function of the check valve is to prevent the backflow of the medium and ensure the normal operation, safety and stability of the system. In many fields such as petrochemical, water supply and drainage, and electricity, the performance of the check valve is directly related to the reliability and efficiency of the entire system.

[0003] However, in actual use, the existing check valves have a more prominent problem, that is, scale is easily accumulated inside. Since the transported medium often contains impurities, particles, chemical substances, etc., these substances will gradually adhere to the inner wall of the check valve and the sealing member during the long-term flow process. As time goes by, the scale continues to accumulate, resulting in a gap between the sealing member and the inner wall of the check valve. The formation of this gap seriously affects the sealing performance of the check valve, causing the medium to flow back from time to time. Once the medium flows back, it will not only reduce the working efficiency of the system, but may also cause a series of safety hazards.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The object of the present invention is to provide a check valve with a high sealing structure to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides a check valve with a high sealing structure, comprising: A valve body having a fluid passage inside thereof and provided with a blocking member capable of lifting and lowering to control the opening and closing of the fluid passage; The anti-scaling member comprises a shielding portion sealingly attached to the inner wall of the fluid channel and a sliding portion slidably connected to the inner wall of the valve body and connected to the shielding portion; The piston member includes an air supply portion arranged on the top surface of the valve body and a gas channel opened on the wall surface of the valve body and connected to the air supply portion. The sliding portion slides sealingly inside the gas channel. The blocking member moves up and down to change the pressure difference inside the air supply portion. The pressure difference is transmitted to the inside of the gas channel to drive the sliding portion to move along the axis of the fluid channel to change the position of the shielding portion.

[0007] Furthermore, the piston member further comprises a valve cover mounted on the top surface of the valve body to seal the fluid passage, the air supply portion is arranged on the top surface of the valve cover, and the air supply portion comprises: A piston cylinder vertically extends upward from the top surface of the valve cover and has a piston cavity formed inside; The piston plate is installed inside the piston cavity and can perform linear reciprocating motion along the axis of the piston cylinder.

[0008] Furthermore, the gas channel includes: A first air passage is provided on the side wall of the piston cylinder, one end of which is connected to the piston cavity and the other end of which extends to the bottom surface of the piston cylinder; A second air passage is provided inside the valve cover, one end of which extends to the top surface of the valve cover, and the other end of which extends to the side wall of the valve cover; A third air channel is provided on the side wall of the valve body, and when the piston is installed on the valve body, the first air channel, the second air channel and the third air channel are connected to each other; A slideway is provided on the inner wall of the valve body, the bottom end of the third airway is communicated with the slideway, and the sliding part is sealed and slides inside the slideway.

[0009] Furthermore, an annular air cavity connected to the third air channel is provided inside the valve body, and a plurality of first air holes connected to the slide channel are provided on the inner bottom surface of the annular air cavity. The plurality of first air holes are distributed in a circular array, and the gas inside the third air channel flows through the annular air cavity and the first air holes in sequence and then enters the slide channel.

[0010] Furthermore, the fluid channel includes a water inlet channel arranged along the axial extension direction of the valve body and a water outlet channel arranged along the radial extension direction of the valve body, the cross-section of the water inlet channel is trapezoidal, and the anti-scaling component is located inside the water inlet channel.

[0011] Furthermore, the shielding portion includes: A first sleeve is slidably connected to the inside of the water inlet flow channel, and has smooth inner and outer walls, and its outer wall is in contact with the inner wall of the water inlet flow channel with the smallest inner diameter; A ring plate, connected to the outer wall of the bottom end of the first sleeve and extending in the radial direction of the first sleeve, with its outer wall fitting against the inner wall of the maximum inner diameter of the water inlet flow channel; The sliding portion includes: A second sleeve is slidably connected to the interior of the slideway, and a bottom end of the second sleeve is adjacent to the top surface of the ring plate; The sealing ring is connected to the top surface of the second sleeve, and the inner and outer walls of the sealing ring are both sealed and attached to the wall surface of the slideway.

[0012] Furthermore, the anti-scaling member also includes: A locking sleeve, wherein a sliding cavity is provided on the side wall of the valve body, and the locking sleeve is slidably connected inside the sliding cavity; A ball, a sliding hole connecting the slideway and the sliding cavity is provided on the side wall of the valve body, the ball is slidably connected to the inside of the sliding hole, a groove for the ball to be inserted is provided on the outer wall of the second sleeve; a clearance groove for avoiding the ball is provided on the inner wall of the lock sleeve; The support spring is installed inside the slideway, with its bottom end connected to the inner wall of the slideway and its top end connected to the side wall of the lock sleeve. The support spring pushes the lock sleeve upward under the initial elastic force.

[0013] Furthermore, a second air hole is opened on the side wall of the valve body, one end of the second air hole is connected to the upper part of the slideway, and the other end is connected to the upper part of the slide cavity. The gas entering the gas channel will preferentially enter the slide cavity through the second air hole to push the lock sleeve downward.

[0014] Furthermore, the blocking member includes a valve stem disposed on the piston member and a sealing member connected to the valve stem, wherein the valve stem includes: A polished rod section is slidably connected to the valve cover, and its top end passes through both ends of the piston cylinder. One end of the polished rod section extending outside the piston cylinder is connected to a hand wheel, and the piston plate is fixedly mounted on the outer wall of the polished rod section; The threaded section is threadedly connected to the inside of the valve cover, one end of which is connected to the polished rod section, and the other end of which is connected to the sealing member.

[0015] Furthermore, the sealing element comprises: The sealing head is a cylindrical body connected to the threaded section, and an elastic sealing gasket is installed on its outer wall. When the sealing head is extended into the water inlet flow channel, the sealing gasket is tightly against the water inlet flow channel; A plurality of annular grooves are provided on the outer wall of the sealing head and cooperate with the sealing gasket to form a sealed chamber; A through hole extends vertically upward from the bottom surface of the end cap, and its end passes through the polished rod section and the threaded section. A communicating hole extending radially is provided inside the end cap, and one end of the communicating hole is connected to the through hole, and the other end is connected to the annular groove; A sliding rod is slidably connected to the inside of the through hole, and one end thereof extending to the outside of the head is connected to a baffle, a sealed flexible air bag is arranged between the baffle and the bottom surface of the head, an external threaded portion for locking the position of the sliding rod is arranged on the outer wall of the sliding rod, and an internal threaded portion cooperating with the external threaded portion is arranged inside the through hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention realizes the check function by controlling the opening and closing of the fluid channel through the lifting and lowering of the plugging member. The anti-scaling member is provided, and its shielding portion can reduce the adhesion of impurities and the like to the inner wall of the fluid channel. The sliding portion cooperates with the gas channel and can automatically adjust the position of the shielding portion according to the action of the plugging member, so that the inside of the fluid channel is not easy to scale, thereby improving the anti-scaling effect. When the plugging member cuts off the fluid channel, the plugging member cooperates with the clean inner wall of the fluid channel, thereby improving the sealing performance of the check valve and reducing the risk of medium backflow.

[0017] 2. In the present invention, the support spring is in the slide, the bottom end is connected to the inner wall of the slide, and the top end is connected to the side wall of the locking sleeve. The locking sleeve moves under the action of the support spring, and the ball is inserted into the slot to limit the position of the second sleeve, thereby locking the position of the second sleeve and improving the stability of the installation of the second sleeve. When the gas pressure changes and the gas enters the slide, the second sleeve is pushed, which will push the locking sleeve downward in advance, causing the ball to disengage from the slot to unlock the restriction on the position of the second sleeve. Through the design of the locking sleeve, the ball, the slot and the support spring, a locking and unlocking mechanism is provided for the sliding part of the anti-scaling part, which can flexibly control the position of the anti-scaling part according to the change of gas pressure, thereby improving the working stability and reliability of the anti-scaling part.

[0018] 3. In the present invention, rotating the slide bar can make it move up and down in the through hole; when the slide bar moves, it will drive the baffle to squeeze or stretch the flexible airbag; if the flexible airbag is squeezed, the internal gas pressure increases, and the gas enters the annular groove through the through hole and the connecting hole, further squeezing the sealing gasket, making it fit more closely with the inner wall of the water inlet channel, thereby significantly enhancing the sealing performance; conversely, if the flexible airbag is stretched, the deformation degree of the sealing gasket can be appropriately adjusted to meet the sealing requirements under different working conditions. This flexible sealing adjustment mechanism greatly enhances the sealing reliability and adaptability of the check valve, enables it to operate stably in a variety of complex working environments, and effectively guarantees the high sealing performance of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 It is a schematic diagram of the connection structure between the valve stem and the valve cover in the present invention; Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of; Figure 5 It is a structural schematic diagram of the valve body in the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the valve body in the present invention; Figure 7 It is a schematic diagram of the structure of the anti-scaling component in the present invention; Figure 8 for Figure 2 A magnified view of the structure at center.

[0020] In the figure: 1. Valve body; 11. Third air channel; 12. Annular air cavity; 13. First air hole; 14. Slideway; 15. Second air hole; 16. Slide cavity; 17. Slide hole; 2. Fluid channel; 3. Water inlet channel; 4. Water outlet channel; 5. Piston member; 51. Valve cover; 52. Piston cylinder; 53. Piston chamber; 54. Piston plate; 55. First air passage; 56. Second air passage; 6. Valve stem; 61. Polished stem section; 62. Hand wheel; 63. Threaded section; 7. sealing member; 71. end cap; 72. sealing gasket; 73. annular groove; 74. connecting hole; 75. through hole; 76. sliding rod; 77. baffle; 78. flexible airbag; 8. Anti-scaling part; 81. First sleeve; 82. Ring plate; 83. Second sleeve; 84. Lock sleeve; 85. Support spring; 86. Ball; 87. Clearance groove. DETAILED DESCRIPTION

[0021] 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.

[0022] See also Figure 1-Figure 8 The present invention provides a technical solution: a check valve with a high sealing structure, comprising: A valve body 1 has a fluid passage 2 inside, and a plugging member is provided on the valve body that can move up and down to control the opening and closing of the fluid passage 2; The anti-scaling member 8 comprises a shielding portion sealingly attached to the inner wall of the fluid channel 2 and a sliding portion slidably connected to the inner wall of the valve body 1 and connected to the shielding portion; The piston member 5 includes an air supply portion arranged on the top surface of the valve body 1 and a gas channel opened on the wall surface of the valve body 1 and connected to the air supply portion. The sliding portion seals and slides inside the gas channel. The sealing member moves up and down to change the pressure difference inside the air supply portion. The pressure difference is transmitted to the inside of the gas channel to drive the sliding portion to move along the axis of the fluid channel 2 to change the position of the blocking portion.

[0023] Specifically, when the blocking member rises, the fluid flows forward in the fluid channel 2 inside the valve body 1. At this time, the internal pressure of the air supply part and the piston part 5 changes, and is transmitted to the sliding part and the anti-scaling part 8 through the gas channel. Under the action of positive pressure, the sliding part is driven to move along the axis of the fluid channel 2, driving the shielding part to move downward and change its position, moving away from the fluid flow direction. When the fluid stops, the blocking member descends, and the fluid channel 2 is closed. At the same time, the internal pressure difference of the air supply part changes again. Under the action of negative pressure, the sliding part is driven to move in the opposite direction, and the shielding part returns to a position close to the inner wall of the fluid channel 2. It should be noted that: the opening and closing of the fluid channel 2 is controlled by the lifting and lowering of the sealing member to realize the check function. The anti-scaling member 8 is arranged so that its shielding portion can reduce the adhesion of impurities and the like to the inner wall of the fluid channel 2. The sliding portion cooperates with the gas channel and can automatically adjust the position of the shielding portion according to the action of the sealing member, so that the inside of the fluid channel 2 is not easy to scale, thereby improving the anti-scaling effect. When the sealing member cuts off the fluid channel 2, the sealing member cooperates with the clean inner wall of the fluid channel 2, thereby improving the sealing performance of the check valve and reducing the risk of medium backflow.

[0024] See also Figure 3 and Figure 4 The piston member 5 further includes a valve cover 51 mounted on the top surface of the valve body 1 to seal the fluid passage 2. The air supply portion is arranged on the top surface of the valve cover 51. The air supply portion includes: The piston cylinder 52 vertically extends upward from the top surface of the valve cover 51, and a piston cavity 53 is formed inside the piston cylinder; The piston plate 54 is installed inside the piston cavity 53 and can perform linear reciprocating motion along the axis of the piston cylinder 52 .

[0025] Specifically, the valve cover 51 is installed on the top surface of the valve body 1 to seal the fluid channel 2. The piston cylinder 52 extends vertically upward from the top surface of the valve cover 51, and has a piston cavity 53 inside. The piston plate 54 is in the piston cavity 53 and can make linear reciprocating motion along the axis of the piston cylinder 52. When the blocking member is raised or lowered, the piston plate 54 is pushed to move, causing the pressure in the fluid channel 2 to change, and then causing the pressure in the piston cavity 53 to change; This enables the air supply part to more effectively sense the pressure changes in the fluid channel 2, thereby accurately controlling the movement of the sliding part connected to the gas channel, further ensuring the normal operation of the anti-scaling part 8, and improving the response accuracy of the check valve to changes in the fluid state.

[0026] See also Figure 2 , Figure 3 , Figure 4 and Figure 6 , the gas channel includes, The first air passage 55 is formed on the side wall of the piston cylinder 52, one end of which is connected to the piston chamber 53, and the other end of which extends to the bottom surface of the piston cylinder 52; The second air passage 56 is provided inside the valve cover 51, one end of which extends to the top surface of the valve cover 51, and the other end of which extends to the side wall of the valve cover 51; The third air passage 11 is provided on the side wall of the valve body 1. When the piston 5 is installed on the valve body 1, the first air passage 55, the second air passage 56 and the third air passage 11 are interconnected. The slideway 14 is provided on the inner wall of the valve body 1 . The bottom end of the third air channel 11 is communicated with the slideway 14 . The sliding part is sealed and slides inside the slideway 14 .

[0027] Specifically, when the piston plate 54 moves in the piston chamber 53, the pressure in the piston chamber 53 changes, and the pressure is transmitted to the second air channel 56 through the first air channel 55, and then reaches the slide 14 through the third air channel 11, driving the sliding part to slide in the slide 14; the pressure change of the air supply part can be accurately and stably transmitted to the sliding part, ensuring that the shielding part of the anti-scaling component 8 adjusts its position in time according to the pressure change in the fluid channel 2, thereby improving the overall performance of the check valve.

[0028] See also Figure 6 The valve body 1 further has an annular air cavity 12 in communication with the third air channel 11. The inner bottom surface of the annular air cavity 12 has a plurality of first air holes 13 in communication with the slide 14. The plurality of first air holes 13 are distributed in a circular array. The gas in the third air channel 11 flows through the annular air cavity 12 and the first air holes 13 in sequence and then enters the slide 14.

[0029] Specifically, the gas in the third gas channel 11 enters the annular gas cavity 12, and a plurality of first gas holes 13 distributed in a circumferential array on the bottom surface of the annular gas cavity 12 are connected to the slideway 14. The gas enters the slideway 14 through the annular gas cavity 12 and the first gas holes 13, pushing the sliding part to move. The provision of the annular air cavity 12 and the first air hole 13 makes the gas entering the slideway 14 more evenly distributed, can push the sliding part more smoothly, ensure the stable movement of the shielding part of the anti-scaling member 8, and improve the anti-scaling effect and the reliability of the check valve.

[0030] See also Figure 6 The fluid channel 2 includes an inlet channel 3 arranged along the axial extension direction of the valve body 1 and an outlet channel 4 arranged along the radial extension direction of the valve body 1. The cross-section of the inlet channel 3 is trapezoidal, and the anti-scaling member 8 is located inside the inlet channel 3.

[0031] Specifically, the fluid channel 2 includes an inlet channel 3 and an outlet channel 4. The inlet channel 3 has a trapezoidal cross section. The anti-scaling member 8 is located in the inlet channel 3. The fluid enters from the inlet channel 3 and flows out from the outlet channel 4 after passing through the anti-scaling member 8. The trapezoidal cross-section design of the water inlet channel 3 enables the anti-scaling component 8 to fit with its inner wall, reducing the possibility of impurities adhering. The anti-scaling component 8 in the water inlet channel 3 can effectively prevent impurities from accumulating on the inner wall of the water inlet channel 3, thereby improving the sealing performance and service life of the check valve.

[0032] See also Figure 2 , Figure 6 , Figure 7 and Figure 8 , the shielding part includes, The first sleeve 81 is slidably connected to the inside of the water inlet channel 3, and has smooth inner and outer walls, and its outer wall is in contact with the inner wall of the smallest inner diameter of the water inlet channel 3; The ring plate 82 is connected to the outer wall of the bottom end of the first sleeve 81 and extends radially along the first sleeve 81, and its outer wall is in contact with the inner wall of the maximum inner diameter of the water inlet channel 3; The sliding part includes: The second sleeve 83 is slidably connected to the interior of the slideway 14, and its bottom end is adjacent to the top surface of the ring plate 82; The sealing ring is connected to the top surface of the second sleeve 83 , and its inner and outer walls are both sealed and attached to the wall surface of the slideway 14 .

[0033] Specifically, the first sleeve 81 of the shielding part slides in the water inlet channel 3, and its outer wall fits with the inner wall of the minimum inner diameter of the water inlet channel 3. The ring plate 82 is connected to the outer wall of the bottom end of the first sleeve 81 and fits with the inner wall of the maximum inner diameter of the water inlet channel 3. The second sleeve 83 of the sliding part slides in the slide 14, and the bottom end is adjacent to the top surface of the ring plate 82. The sealing ring seals and fits the wall of the slide 14. When the gas enters the slide 14, it pushes the second sleeve 83, and then drives the ring plate 82 and the first sleeve 81 to move. The specific structure of the shielding part and the sliding part of the anti-scaling part 8 is clarified. This structural design enables the anti-scaling part 8 to better adapt to the shape of the water inlet channel 3 and effectively prevent impurities from scaling. At the same time, through the cooperation of the sliding part and the gas channel, it is ensured that the anti-scaling part 8 can move flexibly, thereby improving the anti-scaling effect.

[0034] See also Figure 6 , Figure 7 and Figure 8 , the anti-scaling member 8 also includes, The locking sleeve 84, a sliding cavity 16 is formed on the side wall of the valve body 1, and the locking sleeve 84 is slidably connected inside the sliding cavity 16; The ball 86, a sliding hole 17 connecting the slideway 14 and the sliding cavity 16 is opened on the side wall of the valve body 1, and the ball 86 is slidably connected to the inside of the sliding hole 17, and a groove for the ball 86 to be inserted is opened on the outer wall of the second sleeve 83; a clearance groove 87 for avoiding the ball 86 is opened on the inner wall of the lock sleeve 84; The support spring 85 is installed inside the slideway 14, with its bottom end connected to the inner wall of the slideway 14 and its top end connected to the side wall of the lock sleeve 84. The support spring 85 pushes the lock sleeve 84 upward under the initial elastic force; A second air hole 15 is provided on the side wall of the valve body 1 , one end of the second air hole 15 is connected to the upper part of the slide 14 , and the other end is connected to the upper part of the slide cavity 16 . The gas entering the gas channel will first enter the slide cavity 16 through the second air hole 15 to push the lock sleeve 84 downward.

[0035] Specifically, the support spring 85 is in the slideway 14, with the bottom end connected to the inner wall of the slideway 14 and the top end connected to the side wall of the locking sleeve 84. The locking sleeve 84 moves under the action of the support spring 85, and the ball 86 is inserted into the slot to limit the position of the second sleeve 83, thereby locking the position of the second sleeve 83 and improving the stability of the installation of the second sleeve 83. When the gas pressure changes, when the gas enters the slideway 14 and pushes the second sleeve 83, the locking sleeve 84 will be pushed down in advance, so that the ball 86 will be disengaged from the slot to unlock the restriction on the position of the second sleeve 83. Through the design of the locking sleeve 84, the ball 86, the slot and the support spring 85, a locking and unlocking mechanism is provided for the sliding part of the anti-scaling part 8, and the position of the anti-scaling part 8 can be flexibly controlled according to the change of gas pressure, thereby improving the stability and reliability of the anti-scaling part 8. The gas entering the gas channel preferentially enters the sliding cavity 16 through the second air hole 15 to push the lock sleeve 84 downward, so that the ball 86 is separated from the slot, which facilitates the movement of the second sleeve 83. The provision of the second air hole 15 optimizes the flow path of the gas, so that the locking sleeve 84 can respond to the change of the gas pressure more promptly, quickly release the lock of the second sleeve 83, and improve the timeliness and flexibility of the movement of the anti-scaling member 8.

[0036] See also Figure 1-Figure 4 The sealing member includes a valve stem 6 disposed on the piston member 5 and a sealing member 7 connected to the valve stem 6. The valve stem 6 includes: The polished rod section 61 is slidably connected to the valve cover 51, and its top end passes through both ends of the piston cylinder 52. One end of the polished rod section 61 extending outside the piston cylinder 52 is connected to the hand wheel 62, and the piston plate 54 is fixedly installed on the outer wall of the polished rod section 61; The threaded section 63 is threadedly connected to the inside of the valve cover 51 , one end of which is connected to the polished rod section 61 , and the other end of which is connected to the sealing member 7 .

[0037] Specifically, rotating the hand wheel 62 can drive the smooth rod section 61 and the threaded section 63 to rotate, so that the sealing member 7 can be raised and lowered to control the opening and closing of the fluid channel 2. At the same time, the movement of the smooth rod section 61 can also cause the pressure in the piston chamber 53 to change, so that the sealing member can control the opening and closing of the fluid channel 2 through manual operation.

[0038] See also Figure 3 and Figure 4, the seal 7 comprises, The sealing head 71 is a cylindrical body connected to the threaded section 63, and an elastic sealing gasket 72 is installed on its outer wall. When the sealing head 71 is extended into the water inlet channel 3, the sealing gasket 72 is tightly against the water inlet channel 3; A plurality of annular grooves 73 are provided on the outer wall of the sealing head 71 and cooperate with the sealing gasket 72 to form a sealed chamber; The through hole 75 extends vertically upward from the bottom surface of the end cap 71, and its end passes through the polished rod section 61 and the threaded section 63. A communicating hole 74 extending along the radial direction is provided inside the end cap 71, and one end of the communicating hole 74 is connected to the through hole 75, and the other end is connected to the annular groove 73; The slide rod 76 is slidably connected to the inside of the through hole 75, and one end thereof extending to the outside of the head 71 is connected to a baffle 77. A sealed flexible air bag 78 is arranged between the baffle 77 and the bottom surface of the head 71. An external threaded portion for locking the position of the slide rod 76 is arranged on the outer wall of the slide rod 76, and an internal threaded portion cooperating with the external threaded portion is arranged inside the through hole 75.

[0039] Specifically, the core component of the seal 7 is the seal head 71, which is cylindrical and firmly connected to the threaded section 63. When the check valve is working and the fluid channel 2 needs to be closed, the seal head 71 will extend into the water inlet channel 3 as the valve stem 6 rotates. At this time, the elastic sealing gasket 72 installed on the outer wall of the seal head 71 plays a key role. It is tightly against the inside of the water inlet channel 3 to form a basic sealing defense line, which effectively prevents the fluid from leaking from the gap between the seal head 71 and the inner wall of the water inlet channel 3. On the outer wall of the sealing head 71, a plurality of annular grooves 73 are carefully opened; these annular grooves 73 cooperate with the sealing gasket 72 to construct a sealed chamber; when the sealing gasket 72 is subjected to the fluid pressure in the water inlet channel 3, the sealing gasket 72 will be deformed to a certain extent and squeezed into the annular groove 73, further enhancing the sealing effect and reducing the risk of leakage; preventing it from further spreading, playing a role of auxiliary sealing; The through hole 75 extends vertically upward from the bottom surface of the end cap 71, and its end passes through the smooth rod section 61 and the threaded section 63; inside the end cap 71, there is also a connecting hole 74 extending radially thereof, one end of the connecting hole 74 is connected to the through hole 75, and the other end is connected to the annular groove 73. Such a unique channel structure design makes it possible to adjust the sealing state; the sliding rod 76 can slide freely in the through hole 75, one end of which extends to the outside of the end cap 71 and is connected to the baffle 77, and a sealed flexible air bag 78 is provided between the baffle 77 and the bottom surface of the end cap 71; when it is necessary to optimize the sealing effect, the sliding rod 76 can be rotated, because the outer wall of the sliding rod 76 is provided with an external threaded portion, which cooperates with the internal threaded portion inside the through hole 75. Rotating the slide bar 76 can make it move up and down in the through hole 75; when the slide bar 76 moves, it will drive the baffle 77 to squeeze or stretch the flexible airbag 78; if the flexible airbag 78 is squeezed, the internal gas pressure increases, and the gas enters the annular groove 73 through the through hole 75 and the connecting hole 74, further squeezing the sealing gasket 72, making it fit more closely with the inner wall of the water inlet channel 3, thereby significantly enhancing the sealing performance; conversely, if the flexible airbag 78 is stretched, the deformation degree of the sealing gasket 72 can be appropriately adjusted to meet the sealing requirements under different working conditions. This flexible sealing adjustment mechanism greatly enhances the sealing reliability and adaptability of the check valve, enabling it to operate stably in a variety of complex working environments, effectively ensuring the high sealing performance of the check valve.

[0040] Working principle: Basic non-return function operation: In the process of conventional fluid delivery, when the fluid flows forward into the fluid channel 2 of the valve body 1, the valve stem 6 plays a key control role in this process. When the fluid flows forward, the operator rotates the hand wheel 62, and the hand wheel 62 drives the polished rod section 61 to rotate. Due to the threaded connection relationship between the threaded section 63 and the valve cover 51, the rotation of the polished rod section 61 will cause the threaded section 63 to move upward along the thread of the valve cover 51, thereby driving the seal 7 connected thereto to rise. At this time, the fluid channel 2 is opened, and the fluid can flow smoothly. When the fluid stops flowing, the operator rotates the hand wheel 62 in the opposite direction, driving the polished rod section 61 and the threaded section 63 to rotate in the opposite direction, so that the threaded section 63 descends along the thread of the valve cover 51, thereby driving the seal 7 to descend until the fluid channel 2 is completely closed, thereby effectively preventing the fluid from flowing back and realizing the basic non-return function. During this process, the displacement of the valve stem 6 and the internal pressure of the air supply part related to the piston member 5 change due to the change in the flow state of the fluid. This pressure change is transmitted to the sliding part related to the anti-scaling part 8 through a specific gas channel. Specifically, the pressure change of the air supply part causes the gas to flow in the gas channel, thereby driving the sliding part to move along the axial direction of the fluid channel 2. The movement of the sliding part drives the shielding part connected thereto to change its position, and can automatically adjust the position of the shielding part according to the action of the blocking part, so that the inside of the fluid channel 2 is not easy to scale, thereby improving the anti-scaling effect. When the blocking part cuts off the fluid channel 2, the blocking part cooperates with the clean inner wall of the fluid channel 2, thereby improving the sealing performance of the check valve and reducing the risk of medium backflow. At the same time, when the valve stem 6 moves up and the fluid channel 2 is in an open state, the pressure difference inside the air supply part changes again. This change is transmitted to the sliding part through the gas channel, driving the sliding part to move in the opposite direction, so that the shielding part returns to its initial position close to the inner wall of the fluid channel 2, preparing for the next fluid flow and anti-scaling work. The piston 5 cooperates with the gas channel: The structural design of the piston member 5 plays a key role in pressure transmission and control in the operation of the entire check valve. The valve cover 51 is installed on the top surface of the valve body 1. Its main function is to seal the fluid channel 2 to ensure that the fluid flows in the channel according to a predetermined path without leakage. The piston cylinder 52 extends vertically upward from the top surface of the valve cover 51, and a closed piston chamber 53 is formed inside the piston cylinder 52. The piston plate 54 is installed inside the piston chamber 53 and can perform linear reciprocating motion along the axial direction of the piston cylinder 52. When the blocking member moves up and down due to the operator turning the hand wheel 62, it will directly push the piston plate 54 to perform linear reciprocating motion in the piston chamber 53. This action will cause the pressure inside the piston cylinder 52 to change. This pressure change will be transmitted through the gas channel, and the pressure change in the piston chamber 53 will; The gas channel is composed of a first gas channel 55, a second gas channel 56, a third gas channel 11 and a slide 14. When the piston plate 54 moves in the piston chamber 53, the pressure in the piston chamber 53 changes. This pressure change is first transmitted through the first gas channel 55 opened on the side wall of the piston cylinder 52. One end of the first gas channel 55 is connected to the piston chamber 53, and the other end extends to the bottom surface of the piston cylinder 52. The pressure is transmitted to the second gas channel 56 through the first gas channel 55. The second gas channel 56 is opened inside the valve cover 51, one end of which extends to the top surface of the valve cover 51, and the other end extends to the valve cover 51. The pressure is then transmitted to the third air channel 11 through the second air channel 56. The third air channel 11 is provided on the side wall of the valve body 1. When the piston member 5 is installed on the valve body 1, the first air channel 55, the second air channel 56 and the third air channel 11 are interconnected, thereby ensuring that the pressure can be smoothly transmitted. Finally, the pressure reaches the slideway 14. The slideway 14 is provided on the inner wall of the valve body 1. The bottom end of the third air channel 11 is connected to the slideway 14. The pressure forms a driving force in the slideway 14, driving the sliding part connected to the anti-scaling member 8 to slide in the slideway 14, thereby realizing the adjustment of the position of the anti-scaling member 8. Working mechanism of anti-scaling element 8: The design of the anti-scaling member 8 is intended to solve the problem of impurity accumulation in the traditional check valve affecting the sealing performance. The shielding part and the sliding part of the anti-scaling member 8 cooperate closely to jointly achieve the anti-scaling function.

[0041] The shielding portion is composed of a first sleeve 81 and a ring plate 82. The first sleeve 81 slides in the water inlet channel 3, and its outer wall is designed to fit tightly with the inner wall of the smallest inner diameter of the water inlet channel 3. This fitting method can minimize the adhesion of impurities in the gap between the outer wall of the first sleeve 81 and the inner wall of the water inlet channel 3. The ring plate 82 is connected to the outer wall of the bottom end of the first sleeve 81 and extends along the radial direction of the first sleeve 81. Its outer wall fits with the inner wall of the largest inner diameter of the water inlet channel 3. Such a structural design enables the shielding portion to better adapt to the trapezoidal cross-sectional shape of the water inlet channel 3, fully covering the area where the inner wall of the water inlet channel 3 may be scaled, and effectively preventing impurities from scaling on the inner wall of the water inlet channel 3. The sliding part is composed of a second sleeve 83 and a sealing ring. The second sleeve 83 slides in the slideway 14, and its bottom end is adjacent to the top surface of the ring plate 82. When the gas enters the slideway 14 and generates a driving force, the second sleeve 83 starts to slide under the action of the driving force, thereby driving the ring plate 82 and the first sleeve 81 connected thereto to move, thereby adjusting the position of the shielding part. The sealing ring is connected to the top surface of the second sleeve 83, and its inner wall and outer wall are both sealed and fitted to the wall surface of the slideway 14. Such a sealing design ensures that the pressure of the gas in the slideway 14 can be effectively transmitted to the second sleeve 83, while preventing gas leakage, thereby ensuring the stability and accuracy of the movement of the sliding part. In addition, the anti-scaling member 8 is also provided with a set of locking and unlocking mechanisms to improve the stability and reliability of its operation. A sliding cavity 16 is provided on the side wall of the valve body 1, and the lock sleeve 84 is slidably connected inside the sliding cavity 16. A sliding hole 17 connecting the slideway 14 and the sliding cavity 16 is also provided on the side wall of the valve body 1. A ball 86 is slidably connected in the sliding hole 17. A groove for the ball 86 to be inserted is provided on the outer wall of the second sleeve 83, and a clearance groove 87 for avoiding the ball 86 is provided on the inner wall of the lock sleeve 84. The support spring 85 is installed inside the slideway 14, and its bottom end is connected to the inner wall of the slideway 14, and its top end is connected to the side wall of the lock sleeve 84. The support spring 85 arranged in the slide 14 pushes the second sleeve 83 to move upward, and the ball 86 will be stuck in the groove of the outer wall of the second sleeve 83 during the movement, thereby limiting the position of the second sleeve 83 and preventing it from moving at will. When the gas pressure changes, for example, when it is necessary to adjust the anti-scaling part 8 to move downward, the gas enters the slide cavity 16 through the second air hole 15 opened on the side wall of the valve body 1. One end of the second air hole 15 is connected to the upper part of the slide 14, and the other end is connected to the upper part of the slide cavity 16. The gas entering the slide cavity 16 pushes the lock sleeve 84 to move downward. During the downward movement of the lock sleeve 84, the yield groove 87 on its inner wall no longer avoids the ball 86, so that the ball 86 is separated from the groove of the outer wall of the second sleeve 83. At this time, the second sleeve 83 can continue to move driven by the gas pressure, so as to realize the flexible adjustment of the position of the anti-scaling part 8. Working principle of seal 7: The sealing head 71 of the sealing member 7 is cylindrical and connected to the threaded section 63 of the valve stem 6. When the fluid passage 2 needs to be closed, the operator rotates the hand wheel 62 to drive the polished rod section 61 and the threaded section 63 to rotate. Since the threaded section 63 is threadedly connected to the inside of the valve cover 51, rotating the threaded section 63 will cause it to move downward along the thread of the valve cover 51, thereby driving the sealing head 71 connected to one end thereof to descend and extend into the inside of the water inlet flow passage 3. An elastic sealing gasket 72 is installed on the outer wall of the sealing head 71. When the sealing head 71 is extended into the water inlet channel 3, the sealing gasket 72 is pressed by the sealing head 71 to tightly abut against the inside of the water inlet channel 3, forming a basic sealing defense line, effectively preventing the fluid from leaking from the gap between the sealing head 71 and the inner wall of the water inlet channel 3. A plurality of annular grooves 73 are also provided on the outer wall of the end cap 71. These annular grooves 73 cooperate with the sealing gasket 72 to form a sealed chamber. A through hole 75 is provided inside the end cap 71. The through hole 75 extends vertically upward from the bottom surface of the end cap 71, and its end passes through the polished rod section 61 and the threaded section 63. An external threaded portion is provided on the outer wall of the slide rod 76, and an internal threaded portion cooperating with the external threaded portion is provided inside the through hole 75. When the sealing effect needs to be optimized, the slide rod 76 can be rotated to utilize the external threaded portion of the outer wall of the slide rod 76 and the internal threaded portion of the through hole 75. The cooperation between the internal threaded parts causes the slide bar 76 to move up and down in the through hole 75. When the slide bar 76 moves, it will drive the baffle 77 to squeeze or stretch the flexible air bag 78. If the flexible air bag 78 is squeezed, the internal gas pressure increases, and the gas enters the annular groove 73 through the through hole 75 and the connecting hole 74, further squeezing the sealing gasket 72, making it fit more closely with the inner wall of the water inlet channel 3, thereby significantly enhancing the sealing performance; conversely, if the flexible air bag 78 is stretched, the deformation degree of the sealing gasket 72 can be appropriately adjusted to meet the sealing requirements under different working conditions.

Claims

1. A check valve with a high sealing structure, characterized in that: include: A valve body (1) having a fluid passage (2) therein and provided with a blocking member capable of lifting and lowering to control the opening and closing of the fluid passage (2); The anti-scaling member (8) comprises a shielding portion sealingly attached to the inner wall of the fluid channel (2) and a sliding portion slidably connected to the inner wall of the valve body (1) and connected to the shielding portion; The piston member (5) comprises an air supply portion arranged on the top surface of the valve body (1) and a gas channel opened on the wall surface of the valve body (1) and connected to the air supply portion, the sliding portion sealingly slides inside the gas channel, the blocking member moves up and down to change the pressure difference inside the air supply portion, and the pressure difference is transmitted to the inside of the gas channel to drive the sliding portion to move along the axis of the fluid channel (2), so as to change the position of the shielding portion.

2. A check valve with a high sealing structure as claimed in claim 1, characterized in that: The piston member (5) further comprises a valve cover (51) mounted on the top surface of the valve body (1) to seal the fluid passage (2), the air supply portion being arranged on the top surface of the valve cover (51), and the air supply portion comprising: A piston cylinder (52) extending vertically upward from the top surface of the valve cover (51) and having a piston cavity (53) formed therein; The piston plate (54) is installed inside the piston chamber (53) and can perform linear reciprocating motion along the axis of the piston cylinder (52).

3. A check valve with a high sealing structure as claimed in claim 2, characterized in that: The gas channel comprises: A first air channel (55) is formed on a side wall of the piston cylinder (52), one end of which is in communication with the piston chamber (53) and the other end of which extends to the bottom surface of the piston cylinder (52); a second air passage (56) disposed inside the valve cover (51), one end of which extends to the top surface of the valve cover (51) and the other end of which extends to the side wall of the valve cover (51); a third air channel (11) formed on a side wall of the valve body (1); when the piston member (5) is mounted on the valve body (1), the first air channel (55), the second air channel (56) and the third air channel (11) are in communication with each other; A slideway (14) is provided on the inner wall of the valve body (1); the bottom end of the third airway (11) is in communication with the slideway (14); and the sliding portion seals and slides inside the slideway (14).

4. A check valve with a high sealing structure as claimed in claim 3, characterized in that: The valve body (1) is further provided with an annular air cavity (12) in communication with the third air channel (11); the inner bottom surface of the annular air cavity (12) is provided with a plurality of first air holes (13) in communication with the slideway (14); the plurality of first air holes (13) are distributed in a circular array; the gas in the third air channel (11) flows through the annular air cavity (12) and the first air holes (13) in sequence and then enters the slideway (14).

5. A check valve with a high sealing structure as claimed in claim 3, characterized in that: The fluid channel (2) comprises a water inlet channel (3) arranged along the axial extension direction of the valve body (1) and a water outlet channel (4) arranged along the radial extension direction of the valve body (1); the cross section of the water inlet channel (3) is trapezoidal, and the anti-scaling component (8) is located inside the water inlet channel (3).

6. A check valve with a high sealing structure as claimed in claim 5, characterized in that: The shielding portion includes: A first sleeve (81) is slidably connected to the inside of the water inlet channel (3), and has smooth inner and outer walls, and its outer wall is in contact with the inner wall of the water inlet channel (3) with the smallest inner diameter; A ring plate (82) connected to the outer wall of the bottom end of the first sleeve (81) and extending radially along the first sleeve (81), with its outer wall being in contact with the inner wall of the maximum inner diameter of the water inlet channel (3); The sliding portion includes: A second sleeve (83) is slidably connected to the interior of the slideway (14), and a bottom end thereof is adjacent to the top surface of the ring plate (82); A sealing ring is connected to the top surface of the second sleeve (83), and its inner and outer walls are both sealed against the wall surface of the slideway (14).

7. A check valve with a high sealing structure as claimed in claim 6, characterized in that: The anti-scaling member (8) further comprises: A locking sleeve (84), wherein a sliding cavity (16) is provided on a side wall of the valve body (1), and the locking sleeve (84) is slidably connected inside the sliding cavity (16); A ball (86), a sliding hole (17) connecting the slideway (14) and the sliding cavity (16) is formed on the side wall of the valve body (1), the ball (86) is slidably connected to the inside of the sliding hole (17), a groove for the ball (86) to be inserted is formed on the outer wall of the second sleeve (83); and a clearance groove (87) for avoiding the ball (86) is formed on the inner wall of the lock sleeve (84); A support spring (85) is installed inside the slideway (14), with its bottom end connected to the inner wall of the slideway (14) and its top end connected to the side wall of the lock sleeve (84). The support spring (85) pushes the lock sleeve (84) upward under the initial elastic force.

8. A check valve with a high sealing structure as claimed in claim 7, characterized in that: A second air hole (15) is provided on the side wall of the valve body (1), one end of the second air hole (15) is connected to the upper part of the slideway (14), and the other end is connected to the upper part of the slide cavity (16). Gas entering the gas channel will preferentially enter the slide cavity (16) through the second air hole (15) to push the lock sleeve (84) downward.

9. A check valve with a high sealing structure according to any one of claims 1 to 8, characterized in that: The blocking member comprises a valve stem (6) arranged on the piston member (5) and a sealing member (7) connected to the valve stem (6), wherein the valve stem (6) comprises: a polished rod section (61) slidably connected to the valve cover (51), with its top end passing through both ends of the piston cylinder (52); one end of the polished rod section (61) extending outside the piston cylinder (52) is connected to a hand wheel (62); and the piston plate (54) is fixedly mounted on the outer wall of the polished rod section (61); The threaded section (63) is threadedly connected to the interior of the valve cover (51), one end of which is connected to the polished rod section (61) and the other end of which is connected to the sealing member (7).

10. A check valve with a high sealing structure as claimed in claim 9, characterized in that: The sealing member (7) comprises: The sealing head (71) is in the form of a cylinder and is connected to the threaded section (63). An elastic sealing gasket (72) is installed on its outer wall. When the sealing head (71) is extended into the water inlet channel (3), the sealing gasket (72) is tightly abutted against the inside of the water inlet channel (3); A plurality of annular grooves (73) are formed on the outer wall of the sealing head (71) and cooperate with the sealing gasket (72) to form a sealed chamber; A through hole (75) vertically extends upward from the bottom surface of the sealing head (71), and its end passes through the polished rod section (61) and the threaded section (63); a communicating hole (74) extending radially thereof is provided inside the sealing head (71); one end of the communicating hole (74) is communicated with the through hole (75), and the other end is communicated with the annular groove (73); The slide rod (76) is slidably connected to the inside of the through hole (75), and one end of the slide rod (76) extending to the outside of the head (71) is connected to a baffle (77), and a sealed flexible air bag (78) is provided between the baffle (77) and the bottom surface of the head (71). An external threaded portion for locking the position of the slide rod (76) is provided on the outer wall of the slide rod (76), and an internal threaded portion cooperating with the external threaded portion is provided inside the through hole (75).

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