High-pressure sealing valve with buffer structure

Abstract

The invention discloses a high-pressure sealing valve with a buffering structure. The high-pressure sealing valve comprises a valve body, a valve cover, a valve rod and a valve element. A valve seat is arranged in the valve body, and an inlet channel and an outlet channel are formed in the two ends of the valve body respectively. The valve further comprises a flow guide sealing piece arranged on the valve seat on the outer side of the valve element and an elastic buffering piece arranged at the inlet channel. A flow guide channel, a pressing sealing piece and an overflow channel are sequentially arranged in the upper end of the flow guide sealing piece, an opening groove facing the inlet channel and a flow guide hole facing the opening of the valve seat are further formed in the lower end of the flow guide sealing piece, and the valve element is used for sealing the opening groove, the flow guide hole and the opening of the valve seat. According to the high-pressure sealing valve, the flow guide sealing piece and the elastic buffering piece are arranged in the valve cavity, so that the effects of reducing fluid impact force, assisting opening and closing of the valve element and improving the sealing performance of the valve element can be synchronously achieved when the valve is opened and closed, and the use convenience of the valve is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly relates to a high-pressure sealing valve with a buffer structure. Background Art

[0002] A valve is a device used to control the direction, pressure, and flow rate of fluids in a fluid system, and can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil products, liquid metals, and radioactive media.

[0003] During the daily use of a valve, the spool is subjected to the impact of high-pressure fluid at the moment of opening. Over time, the side of the spool is easily damaged by the impact, resulting in unsmooth opening and reduced sealing performance, thereby reducing the service life of the valve. Therefore, there is an urgent need for a high-pressure sealing valve with a buffer structure to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-pressure sealing valve with a buffer structure to solve the problems mentioned in the above background art.

[0005] To achieve the above object, the solution of the present invention is: a high-pressure sealing valve with a buffer structure, including a valve body, a valve cover, a valve stem, and a spool; a valve seat is provided inside the valve body, and an inlet passage and an outlet passage are respectively provided at both ends of the valve body; the valve also includes a diversion seal provided on the valve seat outside the spool and an elastic buffer provided at the inlet passage; a diversion channel, a pressing seal, and an overflow channel are sequentially provided inside the upper end of the diversion seal, and an opening groove facing the inlet passage and a diversion hole facing the opening of the valve seat are also provided at the lower end of the diversion seal; the spool is used to seal the opening groove, the diversion hole, and the opening of the valve seat; a first sealing plate is movably provided at the bottom end of the diversion channel, and one end of the first sealing plate is movably connected to the elastic buffer; a second sealing plate is provided in the overflow channel, and the second sealing plate and the first sealing plate are connected by a linkage; a drainage channel communicating with the overflow channel is provided in the valve seat at the outlet passage end, and the other end of the drainage channel extends to directly below the opening of the valve seat; the valve stem passes through the pressing seal and is connected to the spool; when the spool is closed, the first sealing plate is opened and the second sealing plate is closed, and the pressing seal is deformed by the fluid extrusion and presses the spool; when the spool is opened, the first sealing plate is closed and the second sealing plate is opened, the pressing seal is reset to squeeze the fluid into the overflow channel, and it is pushed below the spool through the drainage channel; when the elastic buffer expands and contracts, it will pull the first sealing plate to open or close.

[0006] Furthermore, the valve body is connected to the bottom of the valve cover, and the valve stem is vertically inserted between the valve body and the valve cover; a diaphragm is provided in the valve cavity of the valve body, the guide seal is inserted in the center of the diaphragm and abuts against the top of the valve seat, an oriented groove is provided on the diaphragm, and a guide strip matched with the oriented groove is provided on the outer surface of the guide seal.

[0007] Furthermore, the flow guide seal comprises a detachably connected upper cover and a flow guide sleeve, and a through hole for accommodating a valve stem is provided in the center of the upper cover and the flow guide sleeve; a pressure chamber and a flow guide chamber are provided inside the flow guide sleeve from top to bottom, which are interconnected; the compression seal is located in the pressure chamber, and the valve core is located in the flow guide chamber; the flow guide channel and the overflow channel are both connected to the pressure chamber, and the flow guide channel is located at an opening groove at one end close to the sealing plate.

[0008] Furthermore, the linkage includes a connecting rod and a connecting plate; the connecting rod is vertically arranged in the guide sleeve on one side of the guide channel, the bottom of the connecting rod is connected to the movable end of the sealing plate one, and the top of the connecting rod is fixed to the bottom of the connecting plate; the connecting plate is slidably connected in the gap between the guide sleeve above the pressure chamber and the upper cover, and the top of the sealing plate two is fixed to the bottom of the connecting plate.

[0009] Furthermore, a spring 1 is provided at the bottom of the upper cover, and the bottom of the spring 1 contacts the connecting plate.

[0010] Furthermore, the compression seal includes a second spring, a pressure plate and a diaphragm; the pressure plate is connected to the upper end of the pressure chamber through the second spring, the diaphragm is sleeved on the outer circumference of the pressure plate, and the outer circumference of the diaphragm is embedded in the inner wall of the pressure chamber.

[0011] Furthermore, a through hole adapted to the valve stem is provided at the center of the pressure plate, and a rubber sealing pad is provided at the bottom of the pressure plate.

[0012] Furthermore, the valve core only moves up and down in the flow guide cavity, and the compression seal can enter the flow guide cavity from the pressure cavity and abut the valve core when it is telescopically deformed.

[0013] Furthermore, the elastic buffer comprises baffle 1, an elastic telescopic column, baffle 2 and a connecting rod; baffle 1 and baffle 2 are rotatably arranged at the bottom edge of the inlet channel and under the cross partition respectively, the elastic telescopic column is connected between baffle 1 and baffle 2 and makes baffle 1, the elastic telescopic column and baffle 2 form a "Z" shaped structure; the connecting rod is movably connected to the other side of baffle 2 and is used to connect sealing plate 1.

[0014] Furthermore, a gap one is left between the top of the baffle plate one and the transverse partition, a gap two is left between the bottom of the baffle plate two and the bottom edge of the inlet channel, and the size of the gap one is smaller than the size of the gap two.

[0015] The beneficial effects of the present invention compared with the prior art are as follows: By providing a diversion seal in the valve cavity of the valve body, when the valve is closed, the fluid stored in the inlet passage will enter the interior of the diversion passage through the sealing plate one opened by the diversion seal and flow above the compression seal. The compression seal is deformed and lowered by the extrusion of the fluid, giving a downward pressure to the valve core, so that the valve core is more tightly sealed at the opening of the valve seat, effectively improving the sealing performance between the valve core and the valve seat.

[0016] By providing an elastic buffer in the inlet passage, when the fluid flows through the valve, it will first impact the elastic buffer. The elastic buffer reduces the fluid pressure through its own elastic telescopic deformation, so that when the fluid reaches the diversion sleeve and contacts the valve core, the impact force on the valve core can be reduced, avoiding damage to the valve core caused by direct impact of high-pressure fluid at the moment of opening, ensuring the sealing performance between the valve core and the valve seat, and extending the service life of the valve.

[0017] The present invention connects the elastic buffer with the sealing plate one, and connects the sealing plate one with the sealing plate two through a linkage member, so that the elastic buffer will drive the synchronous movement of the sealing plate one and the sealing plate two during telescopic deformation, realizing the opening and closing of the diversion passage and the overflow passage. Thus, through the interaction between the fluid in the pressure chamber and the compression seal, the compression sealing and opening assistance of the valve core are realized, enabling the valve to simultaneously reduce the fluid impact force, assist the valve core to open and close, and improve the sealing performance of the valve core during opening and closing, effectively improving the convenience of valve use. Brief Description of the Drawings

[0018] Figure 1 It is a schematic partial sectional structure diagram of the high-pressure sealing valve of the present invention in the closed state; Figure 2 It is a schematic partial sectional structure diagram of the high-pressure sealing valve of the present invention in the open state; Figure 3 It is a three-dimensional structure diagram of the diversion seal of the present invention; Figure 4 It is a sectional structure diagram of the diversion seal of the present invention; Figure 5 For the present invention Figure 1 The enlarged structure diagram at position A; Figure 6 For the present invention Figure 2 The enlarged structure diagram at position A; Figure 7 For the present invention Figure 1 The enlarged structure diagram at position B; Figure 8 For the present invention Figure 2 The enlarged structure diagram at position B.

[0019] In the accompanying drawings, the list of components represented by each reference numeral is as follows: Valve body; 11, valve seat; 12, diversion channel; 2, valve cover; 3, valve stem; 31, push plate; 4, diversion seal; 41, upper cover; 411, first spring; 42, diversion sleeve; 421, diversion channel; 422, pressure chamber; 423, overflow channel; 424, diversion chamber; 43, guide strip; 44, opening groove; 45, diversion hole; 46, first sealing plate; 461, connecting rod; 47, second sealing plate; 48, compression seal; 481, second spring; 482, pressing plate; 483, diaphragm; 49, connecting plate; 5, elastic buffer; 51, first baffle; 52, elastic telescopic column; 53, second baffle; 54, connecting rod; 6, valve core. Specific embodiments

[0020] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0021] Embodiment 1:

[0022] As Figure 1-8As shown in the figure, a high-pressure sealed valve with a buffer structure includes a valve body 1, a valve cover 2, a valve stem 3 and a valve core 6; a valve seat 11 is provided inside the valve body 1, and an inlet channel and an outlet channel are respectively provided at both ends of the valve body 1; the valve further includes a diversion seal 4 provided on the valve seat 11 outside the valve core 6 and an elastic buffer 5 provided at the inlet channel; a diversion channel 421, a compression seal 48 and an overflow channel 423 are sequentially provided inside the upper end of the diversion seal 4, an opening groove 44 facing the inlet channel and a diversion hole 45 facing the opening of the valve seat 11 are further provided at the lower end of the diversion seal 4, and the valve core 6 is used to seal the opening groove 44, the diversion hole 45 and the opening of the valve seat 11; a first sealing plate 46 is movably provided at the bottom end of the diversion channel 421, and one end of the first sealing plate 46 is movably connected to the elastic buffer 5; a second sealing plate 47 is provided in the overflow channel 423, and the second sealing plate 47 and the first sealing plate 46 are connected by a linkage; a diversion channel 12 communicating with the overflow channel 423 is provided in the valve seat 11 at the outlet channel end, and the other end of the diversion channel 12 extends to directly below the opening of the valve seat 11; the valve stem 3 passes through the compression seal 48 and is connected to the valve core 6; when the valve core 6 is closed, the first sealing plate 46 is opened and the second sealing plate 47 is closed, and the compression seal 48 is deformed by the fluid extrusion and presses against the valve core 6; when the valve core 6 is opened, the first sealing plate 46 is closed and the second sealing plate 47 is opened, and the compression seal 48 is reset to squeeze the fluid into the overflow channel 423 and push it below the valve core 6 through the diversion channel 12; when the elastic buffer 5 expands and contracts, it will pull the first sealing plate 46 to open or close; among them, when the valve is closed, the valve stem 3 drives the valve core 6 to descend so that the bottom end of the valve core 6 is inserted into the diversion hole 45 and seals the opening groove 44 and the opening of the valve seat 11. At this time, the diversion seal 4 is completely sealed, the elastic buffer 5 is in a normal state, and the fluid in the inlet channel will enter the diversion channel 421 through the opened first sealing plate 46 and flow to above the compression seal 48. At this time, the overflow channel 423 is closed by the second sealing plate 47, and the compression seal 48 is deformed under the influence of the fluid pressure, descends and abuts against the valve core 6 to give the valve core 6 a downward pressure, so that the valve core 6 is more tightly sealed at the opening of the valve seat 11, effectively improving the sealing performance between the valve core 6 and the valve seat 11; when the valve is opened, the valve stem 3 drives the valve core 6 to rise so that the bottom end of the valve core 6 leaves the diversion hole 45. At this time, the fluid can flow from the opening groove 44 of the diversion seal 4 to the diversion hole 45 and then flow out through the opening of the valve seat 11 to the outlet channel. During the flow of the high-pressure fluid, it will preferentially impact the elastic buffer 5 at the inlet channel, and the elastic expansion and contraction deformation of the elastic buffer 5 itself is used to slow down the fluid pressure, so that when the fluid contacts the valve core 6 after reaching the diversion seal 4, the impact force on the valve core 6 can be reduced, avoiding damage to the valve core 6 caused by direct impact of the high-pressure fluid at the moment of opening, ensuring the sealing performance between the valve core 6 and the valve seat 11, and extending the service life of the valve;Meanwhile, after the valve is opened, when the elastic buffer 5 is stretched and deformed due to the impact of the fluid, it will drive the first sealing plate 46 to close and close the bottom of the diversion channel 421. When the first sealing plate 46 closes, it will drive the second sealing plate 47 to move upward through the linkage to open the overflow channel 423. At this time, the pressure exerted by the fluid accumulated above the diversion channel 421 and the pressing seal 48 is not enough to deform it. The pressing seal 48 will automatically reset under the action of its own resilience and push the excess fluid into the overflow channel 423, and then the overflow channel 423 will guide it into the diversion channel 12 and push it to directly below the opening of the valve seat 11, giving the valve core 6 an upward thrust to make it easier and smoother to open.

[0023] In this embodiment, the bottom of the valve core 6 is adapted to the diversion hole 45 and the opening of the sealing valve seat 11. When the valve core 6 passes through the diversion hole 45 to block the opening of the sealing valve seat 11, the inner side of the opening groove 44 is also sealed by the side wall of the valve core 6. This is to ensure the stable use of the valve core 6 in the diversion seal 4 and also ensure that the valve core 6 can fully seal the opening of the valve seat 11, so as to ensure the stable closing of the valve.

[0024] In a specific embodiment of this embodiment, the valve body 1 is connected to the bottom of the valve cover 2, and the valve stem 3 is vertically inserted between the valve body 1 and the valve cover 2; a horizontal partition is provided in the valve cavity of the valve body 1, and the diversion seal 4 is inserted through the center of the horizontal partition and abuts against the top of the valve seat 11. The horizontal partition is provided with a guiding groove, and the outer surface of the diversion seal 4 is provided with a guiding strip 43 adapted to the guiding groove; among them, the setting of the horizontal partition can facilitate the assembly of the diversion seal 4 and the valve body 1, ensuring that the valve core 6 located inside the diversion seal 4 can contact the valve seat 11 and open and close the valve body 1; the setting of the guiding groove can facilitate the quick determination of the installation position of the opening groove 44 on the diversion sleeve 42 when the diversion seal 4 is assembled with the horizontal partition, so as to ensure that the opening groove 44 can face the inlet channel; in this embodiment, the guiding strip 43 is provided on the diversion seal 4 directly above the opening groove 44 (as shown in the figure), which is convenient for the quick positioning of the diversion seal 4 during assembly; of course, the position of the guiding strip 43 is not limited to the above position, and it can also be provided on the diversion sleeve 42 on the back of the opening groove 44 or other positions (not shown in the figure), as long as it is ensured that the diversion seal 4 can be quickly oriented during installation. The number of guiding strips 43 provided is not limited to 1 shown in the figure, and the number can also be increased according to actual needs for assembly and positioning.

[0025] It should be noted that the valve body 1, the valve cover 2, the valve stem 3, and the valve core 6 are all basic structures of the valve structure. Therefore, the assembly and connection methods of these structural components are not described in detail.

[0026] In a specific implementation manner of this embodiment, the diversion seal 4 includes a detachable upper cover 41 and a diversion sleeve 42. Through holes for accommodating the valve stem 3 are provided in the centers of both the upper cover 41 and the diversion sleeve 42. Inside the diversion sleeve 42, a pressure chamber 422 and a diversion chamber 424 that communicate with each other are sequentially arranged from top to bottom. The pressing seal 48 is located in the pressure chamber 422, and the valve core 6 is located in the diversion chamber 424. The diversion channel 421 and the overflow channel 423 are both connected to the pressure chamber 422, and the opening of the diversion channel 421 near one end of the sealing plate 46 is located at the opening groove 44. Among them, the upper cover 41 and the diversion sleeve 42 can be connected by threads or snap connections. The setting of the through holes can facilitate the assembly of the valve stem 3 and ensure that the valve stem 3 can pass through the upper cover 41 and the diversion sleeve 42 to be fixed to the valve core 6 in the diversion chamber 424. In this embodiment, the inner diameter of the pressure chamber 422 is larger than the inner diameter of the diversion chamber 424, and the communication channel between the pressure chamber 422 and the diversion chamber 424 is smaller than the inner diameter of the diversion chamber 424, ensuring that the valve core 6 can only move up and down in the diversion chamber 424 and will not get stuck in the pressure chamber 422, while the pressing seal 48 can enter the diversion chamber 424 through the communication channel to abut against the valve core 6. At the same time, by arranging the first sealing plate 46 at the opening groove 44, it can be ensured that the fluid in the inlet channel can smoothly enter the diversion channel 421 through the opened first sealing plate 46 when the valve core 6 is closed, ensuring the stable use of the pressing seal 48.

[0027] In a specific implementation manner of this embodiment, the linkage member includes a connecting rod 461 and a connecting plate 49; the connecting rod 461 is vertically arranged in a flow guide sleeve 42 on one side of the flow guide channel 421, the bottom of the connecting rod 461 is connected to the movable end of the first sealing plate 46, and the top of the connecting rod 461 is fixed to the bottom of the connecting plate 49; the connecting plate 49 is slidably connected in the gap between the flow guide sleeve 42 above the pressure chamber 422 and the upper cover 41, and the top end of the second sealing plate 47 is fixed to the bottom of the connecting plate 49; wherein, by arranging the connecting plate 49 in the gap between the flow guide sleeve 42 and the upper cover 41, the connecting plate 49 can have sufficient movement space, and the detachable upper cover 41 and flow guide sleeve 42 can facilitate the assembly of the connecting plate 49; when the first sealing plate 46 is closed, the connecting rod 461 is lifted upward under the action of the first sealing plate 46, so the connecting plate 49 will drive the second sealing plate 47 to lift synchronously under the action of the connecting rod 461, thereby releasing the closing of the overflow channel 423 by the second sealing plate 47 and achieving the closing effect of the flow guide channel 421 when the overflow channel 423 is opened; similarly, when the first sealing plate 46 is opened, the connecting rod 461 descends under the action of the first sealing plate 46, and the connecting plate 49 will drive the second sealing plate 47 to descend synchronously under the action of the connecting rod 461, thereby closing the overflow channel 423 through the second sealing plate 47 and achieving the closing of the overflow channel 423 when the flow guide channel 421 is opened; in addition, in order to prevent the fluid from overflowing when the second sealing plate 47 closes the overflow channel 423, a sealing rubber (not shown in the figure) can be arranged outside the second sealing plate 47 to further improve the sealing effect of the second sealing plate 47 on the overflow channel 423.

[0028] Specifically, a first spring 411 is arranged at the bottom of the upper cover 41, and the bottom of the first spring 411 abuts against the connecting plate 49. The arrangement of the first spring 411 can give a certain supporting force and resilience to the connecting plate 49, ensure the smooth synchronous movement of the connecting rod 461 and the second sealing plate 47 when the connecting plate 49 moves up and down, and at the same time ensure that when the valve core 6 is opened and closed, the first spring 411 can drive the connecting rod 461 and the second sealing plate 47 to move smoothly through the resilience.

[0029] In a specific implementation manner of this embodiment, the pressing and sealing member 48 includes a second spring 481, a pressing plate 482 and a diaphragm 483; the pressing plate 482 is connected to the upper end of the pressure chamber 422 through the second spring 481, the diaphragm 483 is sleeved on the outer circumference of the pressing plate 482, and the outer circumference of the diaphragm 483 is embedded in the inner wall of the pressure chamber 422; wherein, when the valve is closed, the fluid stored in the inlet channel will enter the flow guide channel 421 through the opened first sealing plate 46 and flow into the pressure chamber 422. After the fluid entering the pressure chamber 422 is blocked by the second sealing plate 47, it will apply pressure to the pressing plate 482 and the diaphragm 483, causing the diaphragm 483 to expand and push the pressing plate 482 downward (asFigure 1 , Figure 5 As shown in Figure 5 , when the pressing plate 482 moves downward, it will pull the second spring 481 to deform until the pressing plate 482 blocks the communication end of the pressure chamber 422 and the diversion chamber 424 and presses the top of the valve core 6, giving the valve core 6 a downward pressure to make the valve core 6 more tightly sealed at the opening of the valve seat 11, so as to improve the sealing performance between the valve core 6 and the valve seat 11; when the valve is opened, the first sealing plate 46 is closed and the second sealing plate 47 is opened, which will block the diversion channel 421 and open the overflow channel 423. The pressing plate 482 and the diaphragm 483 will squeeze the fluid in the pressure chamber 422 into the overflow channel 423 and guide it to the drainage channel 12 under the resilience of the second spring 481, so that the fluid in the pressure chamber 422 will flow to directly below the opening of the valve seat 11, giving the valve core 6 an upward thrust to ensure that the valve core 6 can be opened more conveniently and smoothly.

[0030] In order to improve the pressing and sealing effect of the pressing plate 482 on the valve core 6, a push plate 31 can also be provided on the valve stem 3 below the pressing plate 482. The push plate 31 can be provided Figure 1 , Figure 2 , Figure 5 , Figure 6 with the "T"-shaped structure shown in Figure 5 , Figure 6 , Figure 4 , and , and a groove adapted to the structure of the push plate 31 is provided at the connection of the pressure chamber 422 and the diversion chamber 424. While ensuring that the pressing seal 48 gives the valve core 6 a pressing force, it can also reduce the excessive deformation of the second spring 481 and the diaphragm 483 to extend the service life of the second spring 481 and the diaphragm 483; of course, the push plate 31 is not limited to the above shape and can also be an "I"-shaped structure (i.e., the groove structure is the "I"-shaped groove shown in

[0031] ) or other shapes, as long as it is ensured that the pressing seal 48 can closely fit above the push plate 31 and can apply pressure to the valve core 6.

[0031] Specifically, a through hole adapted to the valve stem 3 is provided in the center of the pressing plate 482, and a rubber sealing pad is provided at the bottom of the pressing plate 482; the through hole is provided to facilitate the up and down movement of the pressing plate 482 along the valve stem 3, and the rubber sealing pad is provided to improve the elasticity of the bottom of the pressing plate 482 and reduce the extrusion force when the pressing plate 482 presses the push plate 31, thereby reducing the damage of the push plate 31; in addition, in order to improve the sealing performance between the valve stem 3 and the diversion seal 4, sealing rings can also be provided inside the through holes of the upper cover 41, the diversion sleeve 42, and the pressing plate 482 to improve the sealing performance at the connection of the upper cover 41, the diversion sleeve 42, and the pressing plate 482 with the valve stem 3 and prevent fluid from flowing from the pressure chamber 422 to the diversion chamber 424; and ​​In a specific implementation manner of this embodiment, the elastic buffer member 5 includes a first baffle 51, an elastic telescopic column 52, a second baffle 53, and a connecting rod 54; the first baffle 51 and the second baffle 53 are respectively rotatably arranged at the bottom edge of the inlet passage and below the transverse partition, and the elastic telescopic column 52 is connected between the first baffle 51 and the second baffle 53 to form a "Z"-shaped structure by the first baffle 51, the elastic telescopic column 52, and the second baffle 53; the connecting rod 54 is movably connected to the other side of the second baffle 53 for connecting the first sealing plate 46; wherein, the contact ends of the first baffle 51 and the second baffle 53 with the inlet passage are shaped to match the inner cavity shape of the inlet passage, and limiting grooves for accommodating the first baffle 51 and the second baffle 53 are respectively provided at the bottom edge of the inlet passage and below the transverse partition to prevent the first baffle 51 and the second baffle 53 from being excessively deformed and affecting the flow rate of the valve; the elastic telescopic column 52 is a common spring-type telescopic structure to ensure that there is a certain telescopic margin when the first baffle 51 and the second baffle 53 are telescopically deformed, avoiding damage to the first baffle 51 and the second baffle 53 caused by excessive fluid pressure; the "Z"-shaped structure formed by connecting the first baffle 51, the elastic telescopic column 52, and the second baffle 53 itself also has a certain telescopic deformation space, which can effectively disperse the impact force of high-pressure fluid.

[0032] Specifically, there is a first gap between the top of the first baffle 51 and the transverse partition, and a second gap between the bottom of the second baffle 53 and the bottom edge of the inlet passage, and the size of the first gap is smaller than the size of the second gap; the setting of the first gap and the second gap can ensure the flow rate of the inlet passage and prevent the first baffle 51 and the second baffle 53 from being damaged by the direct impact of high-pressure fluid.

[0033] In summary, for the high-pressure sealing valve with a buffer structure provided by the present invention, by arranging a diversion seal 4 and an elastic buffer 5 in the valve cavity of the valve body 1, when the valve is closed, the fluid stored in the inlet passage will enter the inside of the diversion passage 421 through the opened first sealing plate 46 and flow into the pressure chamber 422. The fluid squeezes and compresses the seal 48 to deform and descend, giving a downward pressure to the valve core 6, so that the valve core 6 is more tightly sealed at the opening of the valve seat 11, effectively improving the sealing performance between the valve core 6 and the valve seat 11. When the valve is opened, the flowing high-pressure fluid will first impact the elastic buffer 5 in the inlet passage. The elastic expansion and contraction deformation of the elastic buffer 5 itself is used to slow down the pressure of the fluid, so that when the fluid reaches the guide sleeve 42 and contacts the valve core 6, the impact force on the valve core 6 can be reduced, avoiding damage to the valve core 6 caused by direct impact of the high-pressure fluid at the moment of opening, ensuring the sealing performance between the valve core 6 and the valve seat 11, and extending the service life of the valve. At the same time, after the valve is opened, due to the elastic expansion and contraction deformation of the elastic buffer 5 caused by the impact of the fluid, it will drive the first sealing plate 46 to close and close the diversion passage 421. When the first sealing plate 46 is closed, it will drive the second sealing plate 47 to move and open the overflow passage 423 through the linkage member. The fluids in the diversion passage 421 and the pressure chamber 422 will be pushed by the reset of the pressing seal 48 and introduced into the drainage passage 12 through the overflow passage 423, and finally pushed to directly below the opening of the valve seat 11, giving an upward thrust to the valve core 6, so that the valve core 6 can be opened more conveniently and smoothly, enabling the valve to simultaneously achieve the effects of reducing the fluid impact force, assisting the opening and closing of the valve core, and improving the sealing performance of the valve core during opening and closing, effectively improving the use convenience of the valve.

[0034] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0035] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-pressure sealing valve with a buffer structure, comprising a valve body (1), a valve cover (2), a valve stem (3) and a valve core (6); a valve seat (11) is provided inside the valve body (1), and an inlet channel and an outlet channel are provided at both ends of the valve body (1); the characteristics are: It also includes a flow guide seal (4) arranged on the valve seat (11) outside the valve core (6) and an elastic buffer (5) arranged at the inlet channel; the upper end of the flow guide seal (4) is provided with a flow guide channel (421), a compression seal (48) and an overflow channel (423) in sequence; the lower end of the flow guide seal (4) is also provided with an opening groove (44) facing the inlet channel and a flow guide hole (45) facing the valve seat (11); the valve core (6) is used to seal the opening groove (44), the flow guide hole (45) and the opening of the valve seat (11); the bottom end of the flow guide channel (421) is movably provided with a sealing plate 1 (46), one end of which is movably connected to the elastic buffer (5); the overflow channel (423) is provided with a sealing plate 2 (47), and the sealing plate 2 (47) and the sealing plate 1 are connected to each other. (46) are connected by a linkage; a drainage channel (12) communicating with the overflow channel (423) is provided in the valve seat (11) at the outlet channel end, and the other end of the drainage channel (12) extends to just below the opening of the valve seat (11); the valve stem (3) passes through the compression seal (48) and is connected to the valve core (6); when the valve core (6) is closed, the sealing plate 1 (46) is opened and the sealing plate 2 (47) is closed, and the compression seal (48) is deformed by the fluid and presses the valve core (6); when the valve core (6) is opened, the sealing plate 1 (46) is closed and the sealing plate 2 (47) is opened, and the compression seal (48) is reset to squeeze the fluid into the overflow channel (423) and push it to the bottom of the valve core (6) through the drainage channel (12); when the elastic buffer (5) is stretched and deformed, it pulls the sealing plate 1 (46) to open or close.

2. A high pressure sealing valve with a buffer structure as claimed in claim 1, characterized in that: The valve body (1) is connected to the bottom of the valve cover (2), and the valve stem (3) is vertically inserted between the valve body (1) and the valve cover (2); a transverse partition is provided in the valve cavity of the valve body (1), the flow guide seal (4) is inserted in the center of the transverse partition and abuts against the top of the valve seat (11), the transverse partition is provided with an orientation groove, and the outer surface of the flow guide seal (4) is provided with a guide strip (43) adapted to the orientation groove.

3. A high pressure sealing valve with a buffer structure as claimed in claim 1, characterized in that: The flow guide seal (4) comprises a detachably connected upper cover (41) and a flow guide sleeve (42); the upper cover (41) and the flow guide sleeve (42) are centrally provided with a through hole for accommodating the valve stem (3); the flow guide sleeve (42) is provided with a pressure chamber (422) and a flow guide chamber (424) interconnected from top to bottom; the compression seal (48) is located in the pressure chamber (422), and the valve core (6) is located in the flow guide chamber (424); the flow guide channel (421) and the overflow channel (423) are both connected to the pressure chamber (422), and the flow guide channel (421) is opened at one end close to the sealing plate (46) and located at the opening groove (44).

4. A high pressure sealing valve with a buffer structure as claimed in claim 3, characterized in that: The linkage member comprises a connecting rod (461) and a connecting plate (49); the connecting rod (461) is vertically arranged in a guide sleeve (42) on one side of the guide channel (421); the bottom of the connecting rod (461) is connected to the movable end of the sealing plate 1 (46); the top of the connecting rod (461) is fixed to the bottom of the connecting plate (49); the connecting plate (49) is slidably connected in the gap between the guide sleeve (42) above the pressure chamber (422) and the upper cover (41); the top of the sealing plate 2 (47) is fixed to the bottom of the connecting plate (49).

5. A high pressure sealing valve with a buffer structure as claimed in claim 4, characterized in that: A spring 1 (411) is provided at the bottom of the upper cover (41), and the bottom of the spring 1 (411) is in contact with the connecting plate (49).

6. A high pressure sealing valve with a buffer structure as claimed in claim 3, characterized in that: The compression seal (48) comprises a second spring (481), a pressure plate (482) and a diaphragm (483); the pressure plate (482) is connected to the upper end of the pressure chamber (422) via the second spring (481), the diaphragm (483) is sleeved on the outer circumference of the pressure plate (482), and the outer circumference of the diaphragm (483) is embedded in the inner wall of the pressure chamber (422).

7. A high pressure sealing valve with a buffer structure as claimed in claim 6, characterized in that: A through hole matching the valve stem (3) is provided at the center of the pressing plate (482), and a rubber sealing pad is provided at the bottom of the pressing plate (482).

8. A high pressure sealing valve with a buffer structure as claimed in claim 3, characterized in that: The valve core (6) moves up and down only in the flow guide cavity (424); and the compression seal (48) can enter the flow guide cavity (424) from the pressure cavity (422) and abut against the valve core (6) when it is deformed by expansion and contraction.

9. A high pressure sealing valve with a buffer structure according to any one of claims 1 to 8, characterized in that: The elastic buffer (5) comprises a baffle plate 1 (51), an elastic telescopic column (52), a baffle plate 2 (53) and a connecting rod (54); the baffle plate 1 (51) and the baffle plate 2 (53) are rotatably arranged at the bottom edge of the inlet passage and below the transverse partition respectively; the elastic telescopic column (52) is connected between the baffle plate 1 (51) and the baffle plate 2 (53) so that the baffle plate 1 (51), the elastic telescopic column (52) and the baffle plate 2 (53) form a "Z"-shaped structure; the connecting rod (54) is movably connected to the other side of the baffle plate 2 (53) and is used to connect the sealing plate 1 (46).

10. A high pressure sealing valve with a buffer structure as claimed in claim 9, characterized in that: A gap one is left between the top of the baffle plate one (51) and the transverse partition, a gap two is left between the bottom of the baffle plate two (53) and the bottom edge of the inlet channel, and the size of the gap one is smaller than the size of the gap two.

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