Valve body sealing mechanism of gate valve

Abstract

The invention relates to the technical field of gate valves, in particular to a gate valve body sealing mechanism which comprises a valve body, a sleeve, two gate plates and two valve seats. A valve rod is arranged on the valve body, the sleeve is arranged on the valve rod, the two gate plates are arranged on the valve body, and each valve seat corresponds to one gate plate. A first sealing ring is arranged on the valve seat, and a second sealing ring is arranged on the gate plate. According to the valve body sealing mechanism of the gate valve, by arranging the valve body, the sleeve, the two gate plates and the two valve seats, when the gate plates need to block a channel, the sleeve and the gate plates synchronously move to clean impurities between the first sealing ring and the second sealing ring, and when the gate plates need to open the channel again, due to the fact that the gate plates and the valve seats are obliquely arranged at the moment, the sealing effect is good. Therefore, the first sealing ring on the gate plate and the second sealing ring on the corresponding valve seat can be separated more quickly, and the service life of the gate valve is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of gate valves, and in particular to a valve body sealing mechanism of a gate valve. Background Art

[0002] As one of the most commonly used valves, gate valves are widely used in all walks of life. Gate valves have a simple structure, the medium does not change its flow direction when flowing through the gate valve, and the fluid resistance is small, opening and closing is labor-saving, and the application range is wide. The closing part of the gate valve is the gate, which moves in the valve body in the vertical direction of the medium flow, and the medium in the pipeline is opened and closed by closing the gate and the valve seat.

[0003] Gate valves are mainly divided into wedge gate valves and flat gate valves. The main difference between them is whether the two sealing surfaces of the gate and the valve body are in a parallel state or in a wedge-shaped state with a certain angle. When in use, both wedge gate valves and flat gate valves have certain limitations. Specifically, because the gate of the wedge gate valve has a slope, the sealing surface can be separated faster during the opening process, and the wear is less, but the sealing surfaces on the gate and the valve body are more likely to adhere to sediments, and hard granular impurities will damage the sealing surface, directly affecting the life of the valve. The sealing surface of the gate and the valve body of the flat gate valve is always in a fit state during the opening and closing process, which can avoid the influence of particles and suspended matter in the medium on the sealing surface and achieve self-cleaning. However, compared with the wedge gate valve, the sealing surface of the flat gate valve is more difficult to separate during the opening process, which increases the difficulty of operation and energy consumption. Summary of the invention

[0004] The invention provides a valve body sealing mechanism of a gate valve, so as to solve the problem that the existing gate valve cannot clean the sealing surfaces on the gate plate and the valve body and realize faster separation of the sealing surfaces during opening, thereby reducing the wear of the sealing surfaces.

[0005] A valve body sealing mechanism of a gate valve of the present invention adopts the following technical scheme: a valve body sealing mechanism of a gate valve, comprising a valve body, a sleeve, two gate plates and two valve seats; the valve body has a passage running through it in a first direction, the first direction being a horizontal direction; a valve cover is arranged on the valve body, a valve stem is arranged on the valve cover, the valve stem is arranged in a second direction and can rotate around its own axis, the second direction being a vertical direction; a sleeve is arranged on the valve stem, and the valve stem can move up and down by rotating around its own axis; two gate plates are arranged on the valve body and symmetrically arranged about the vertical center axis of the valve stem, and the two gate plates can move up and down to open or block the passage; two valve seats are arranged in the passage and can slide in the passage in the first direction, each valve seat is arranged corresponding to a gate plate, and each valve seat is located on a side of the gate plate arranged corresponding to it, away from the valve stem in the first direction; a first sealing ring is arranged on each valve seat, a second sealing ring is arranged on each gate plate, and the first sealing ring and the second sealing ring arranged corresponding to it are arranged face to face in the first direction. The valve body sealing mechanism of the gate valve has a first state, a second state, a third state and a fourth state. When in the first state, the sleeve moves downward synchronously with the gate plate, and the gate plate and the valve seat are both vertically arranged. When in the second state, the sleeve moves downward relative to the gate plate, and the gate plate and the valve seat are both inclined. When in the third state, the sleeve moves upward synchronously with the gate plate, and the gate plate and the valve seat are both inclined. When in the fourth state, the sleeve moves upward relative to the gate plate, and the gate plate and the valve seat are both vertically arranged.

[0006] Furthermore, the valve stem is a threaded rod, the sleeve is spirally matched with the valve stem, and when the valve stem rotates around its own axis, the sleeve can move up and down.

[0007] Furthermore, it also includes a limit platform and two adjusting rods, the limit platform is coaxial with the sleeve and is arranged on the sleeve around the second direction, the two adjusting rods are arranged one-to-one with the two gate plates, the adjusting rod has a first end and a second end, the first end is rotatably connected to the gate plate corresponding to it, and the second end is rotatably connected to the sleeve; the two gate plates are connected by a first elastic member, the first elastic member is arranged along the first direction, and when the valve body sealing mechanism of the gate valve is in the first state and the fourth state, the second end is located above the first end, and the distance from the first end to the second end in the first direction is a first preset value, when the valve body sealing mechanism of the gate valve is in the second state and the third state, the first end is located above the second end, and the distance from the first end to the second end in the first direction is a second preset value, and the second preset value is greater than the first preset value.

[0008] Furthermore, the valve seat is slidably mounted in the valve body via a second elastic member, and the second elastic member is arranged along the first direction.

[0009] Furthermore, a center plate is provided on both gate plates, and the two center plates are arranged face to face in the first direction. A rotating groove is provided on both center plates, and the rotating groove is an arc-shaped groove. The two center plates are connected by a center rotating block, and the center rotating block rotates with the two rotating grooves; the center rotating block is installed in the valve body through a limit rod, and the limit rod allows the center rotating block to move in the second direction and limits the center rotating block from moving in the first direction.

[0010] Furthermore, the central rotating block is fixedly connected to the limiting rod, a limiting groove is provided on the valve body, the limiting groove is arranged along the second direction, and the limiting rod is slidably installed in the limiting groove.

[0011] Furthermore, the sleeve includes an inner tube and an outer tube; the inner tube is spirally matched with the valve stem, and the outer tube is threadedly matched with the inner tube. The outer tube can move up and down with the inner tube, and can rotate around its own axis relative to the inner tube; the limit platform is arranged on the outer tube around the second direction, and is an integrally formed structure with the outer tube.

[0012] Furthermore, a first spiral groove is provided on the valve stem, and a first spiral protrusion is provided on the inner circumferential wall surface of the inner cylinder, the first spiral protrusion is rotationally matched with the first spiral groove, and when the valve stem rotates around its own axis, the inner cylinder can move up and down; a second spiral protrusion is provided on the outer circumferential wall surface of the inner cylinder, and a second spiral groove is provided on the inner circumferential wall surface of the outer cylinder, the second spiral protrusion is rotationally matched with the second spiral groove, and the spiral lead angle of the first spiral protrusion is greater than the spiral lead angle of the second spiral protrusion.

[0013] Furthermore, a plurality of rotating wedge blocks are arranged on the outer cylinder, and the plurality of rotating wedge blocks are evenly distributed on the outer cylinder around the second direction; a matching cylinder is arranged on the valve body, and the matching cylinder is coaxially arranged with the valve stem and can rotate around its own axis relative to the valve body; a plurality of matching wedge blocks are arranged on the inner circumferential wall surface of the matching cylinder, and the plurality of matching wedge blocks are evenly distributed on the inner circumferential wall surface of the matching cylinder around the second direction, and a matching groove is defined between every two matching wedge blocks adjacently arranged around the second direction, and the plurality of matching grooves are arranged one-to-one correspondingly to the plurality of rotating wedge blocks, and each rotating wedge block can be inserted into its corresponding matching groove.

[0014] Furthermore, an adjusting shaft is rotatably arranged on the valve body, the adjusting shaft is arranged along the first direction and one end of the adjusting shaft extends into the valve body, the end of the adjusting shaft extending into the valve body is fixedly connected to a first bevel gear, and a second bevel gear is coaxially and fixedly connected to the matching cylinder, and the second bevel gear meshes with the first bevel gear.

[0015] The beneficial effects of the present invention are as follows: a valve body sealing mechanism of a gate valve of the present invention is provided with a valve body, a sleeve, two gate plates and two valve seats. When the gate plate is required to block the passage, the sleeve moves synchronously with the gate plate to clean the impurities between the first sealing ring and the second sealing ring, so as to avoid the impurities between the first sealing ring and the second sealing ring from damaging the sealing surface, and the sealing surface is self-cleaned. After the gate plate blocks the passage, the sleeve moves relative to the gate plate, so that the gate plate and the valve seat are both inclined. When the gate plate is required to open the passage again, since the gate plate and the valve seat are both inclined at this time, the gate plate has a slope. During the passage opening process, the sleeve moves synchronously with the gate plate, so that the first sealing ring on the gate plate and the second sealing ring on the corresponding valve seat can be separated faster, thereby reducing the degree of wear on the sealing surface and increasing the service life of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a valve body sealing mechanism of a gate valve of the present invention; Figure 2 A cross-sectional view of the overall structure of an embodiment of a valve body sealing mechanism of a gate valve of the present invention; Figure 3 for Figure 2 The enlarged view of point A in the middle; Figure 4 It is a schematic diagram of an embodiment of a valve body sealing mechanism of a gate valve of the present invention in a first state; Figure 5 A cross-sectional view of the overall structure of an embodiment of a valve body sealing mechanism of a gate valve of the present invention at another viewing angle; Figure 6 for Figure 5 The enlarged view of point B in the middle; Figure 7 for Figure 5 Enlarged view of point C in the middle; Figure 8 for Figure 5 The enlarged view of point D in the middle; Fig. 9 It is a front view of the overall structure of an embodiment of a valve body sealing mechanism of a gate valve of the present invention; Fig.10 for Fig. 9 Cross-sectional view along the middle edge EE; Fig.11 for Fig.10 Cross-sectional view along the middle edge FF.

[0018] In the figure: 100, valve body; 101, channel; 110, valve cover; 120, valve stem; 121, hand wheel; 130, slideway; 140, limit groove; 150, matching cylinder; 151, matching wedge block; 152, second bevel gear; 160, adjusting shaft; 170, first bevel gear; 200, sleeve; 210, inner cylinder; 220, outer cylinder; 221, rotating wedge block; 300, gate; 310, second sealing ring; 320, first elastic member; 330, center plate; 340, rotating slide groove; 350, center rotating block; 360, limit rod; 400, valve seat; 410, first sealing ring; 420, second elastic member; 500, limit platform; 600, adjusting rod. DETAILED DESCRIPTION

[0019] 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.

[0020] An embodiment of a valve body sealing mechanism of a gate valve of the present invention is as follows Figures 1 to 11 shown.

[0021] A valve body sealing mechanism of a gate valve comprises a valve body 100, a sleeve 200, two gate plates 300 and two valve seats 400. The valve body 100 has a passage 101 extending in a first direction, wherein the first direction is a horizontal direction. A valve cover 110 is provided on the valve body 100, a valve stem 120 is provided on the valve cover 110, and a hand wheel 121 is provided on the valve stem 120. The valve stem 120 is provided in a second direction and can rotate around its own axis, wherein the second direction is a vertical direction. The sleeve 200 is provided on the valve stem 120, and the rotation of the valve stem 120 around its own axis can cause the sleeve 200 to move up and down. Two gate plates 300 are both provided on the valve body 100 and are symmetrically provided about the vertical center axis of the valve stem 120, and the two gate plates 300 can both move up and down to open or block the passage 101. The two valve seats 400 are both arranged in the channel 101 and can slide in the first direction in the channel 101. Each valve seat 400 is arranged corresponding to a gate plate 300, and each valve seat 400 is located on a side of the gate plate 300 corresponding to it, which is away from the valve stem 120 in the first direction. A first sealing ring 410 is arranged on each valve seat 400, and a second sealing ring 310 is arranged on each gate plate 300. The first sealing ring 410 and the second sealing ring 310 corresponding to it are arranged face to face in the first direction.

[0022] The valve body sealing mechanism of the gate valve has a first state, a second state, a third state and a fourth state. In the first state, the sleeve 200 moves downward synchronously with the gate 300, and the gate 300 and the valve seat 400 are both vertically arranged. In the second state, the sleeve 200 moves downward relative to the gate 300, and the gate 300 and the valve seat 400 are both inclined. In the third state, the sleeve 200 moves upward synchronously with the gate 300, and the gate 300 and the valve seat 400 are both inclined. In the fourth state, the sleeve 200 moves upward relative to the gate 300, and the gate 300 and the valve seat 400 are both vertically arranged.

[0023] Specifically, the valve stem 120 is a threaded rod, the sleeve 200 is screw-matched with the valve stem 120, and when the valve stem 120 rotates around its own axis, the sleeve 200 can move up and down.

[0024] In this embodiment, a valve body 100, a sleeve 200, two gate plates 300 and two valve seats 400 are provided. In an initial state, the two gate plates 300 are both located above the channel 101 and open the channel 101. At this time, the valve body sealing mechanism of the gate valve is in a first state, and the gate plates 300 and the valve seats 400 are both vertically provided. When the gate plates 300 are required to block the channel 101, the valve stem 120 is rotated around its own axis, and the sleeve 200 is moved downward by the rotation of the valve stem 120. The downward movement of the sleeve 200 will drive the two gate plates 300 to move synchronously, so that the second sealing ring 310 on the gate plate 300 slides along the first sealing ring 410 on the corresponding valve seat 400, until the second sealing ring 310 fits with the first sealing ring 410, and a sealing surface is formed by the first sealing ring 410 and the second sealing ring 310 to block the channel 101. In this process, impurities between the first sealing ring 410 and the second sealing ring 310 will be cleaned to prevent impurities from being between the first sealing ring 410 and the second sealing ring 310 to damage the sealing surface, and the sealing surface is self-cleaned, thereby increasing the service life of the gate valve. After the gate 300 blocks the channel 101, the gate 300 will no longer be able to move. At this time, the valve stem 120 continues to rotate to move the sleeve 200 downward relative to the gate 300, and the gate 300 and the valve seat 400 are both tilted. At this time, the valve body sealing mechanism of the gate valve is in the second state.

[0025] When the gate 300 is needed to open the passage 101 again, the valve stem 120 is rotated around its own axis, and the sleeve 200 is moved upward by the rotation of the valve stem 120. The upward movement of the sleeve 200 will drive the two gates 300 to move synchronously, so that the first sealing ring 310 on the gate 300 and the second sealing ring 410 on the corresponding valve seat 400 are relatively moved and separated. At this time, the valve body sealing mechanism of the gate valve is in the third state, and the gate 300 and the valve seat 400 are both inclined. Since the gate 300 and the valve seat 400 are both inclined at this time, the gate 300 has a slope. In the process of opening the passage 101, the first sealing ring 310 on the gate 300 and the second sealing ring 410 on the corresponding valve seat 400 can be separated faster, reducing the wear degree of the sealing surface. When the gate 300 is above the channel 101 again and opens the channel 101, the gate 300 cannot continue to move upward under the restriction of the valve body 100. At this time, the sleeve 200 moves upward relative to the gate 300. At this time, the valve body sealing mechanism of the gate valve is in the fourth state, and the gate 300 and the valve seat 400 are both vertically arranged. The valve body sealing mechanism of the gate valve returns to the initial state again, completing the first blocking and opening of the channel 101, waiting for the next use.

[0026] In this embodiment, a valve body sealing mechanism of a gate valve further includes a stopper 500 and two adjusting rods 600, the stopper 500 is coaxial with the sleeve 200 and is arranged on the sleeve 200 around the second direction, the two adjusting rods 600 are arranged one by one with the two gate plates 300, the adjusting rod 600 has a first end and a second end, the first end is rotatably connected to the gate plate 300 corresponding to it, and the second end is rotatably connected to the sleeve 200. The two gate plates 300 are connected through a first elastic member 320, the first elastic member 320 is arranged along the first direction, the first elastic member 320 is a spring, and when the valve body sealing mechanism of the gate valve is in the first state and the fourth state, the second end is located above the first end, and the distance from the first end to the second end in the first direction is a first preset value, and when the valve body sealing mechanism of the gate valve is in the second state and the third state, the first end is located above the second end, and the distance from the first end to the second end in the first direction is a second preset value, and the second preset value is greater than the first preset value.

[0027] In this embodiment, a limit table 500 and two adjustment rods 600 are provided. Figure 4As shown, when the gate 300 is needed to block the channel 101, the valve stem 120 is rotated around its own axis, and the sleeve 200 is moved downward by the rotation of the valve stem 120. The sleeve 200 moves downward and drives the two gates 300 to move synchronously. At this time, the second end is located above the first end, and the distance from the first end to the second end in the first direction is a first preset value. In the process of the sleeve 200 driving the two gates 300 to move downward synchronously, the sleeve 200, the limit platform 500, the adjusting rod 600 and the gate 300 are all in a relatively static state.

[0028] When the gate 300 blocks the channel 101, the gate 300 can no longer move. At this time, the valve stem 120 continues to rotate to make the sleeve 200 move downward relative to the gate 300. The movement of the sleeve 200 will drive the second end of the adjusting rod 600 to move, so that the second end of the adjusting rod 600 moves downward relative to its first end, and the first end of the adjusting rod 600 will rotate relative to the gate 300, and the second end of the adjusting rod 600 will rotate relative to the sleeve 200. Since the sleeve 200 cannot move, during the rotation of the adjusting rod 600, the adjusting rod 600 will cause the gate 300 and the valve seat 400 corresponding to the gate 300 to move in the first direction, thereby gradually tilting the gate 300 and the valve seat 400, and causing the first elastic member 320 to deform until the adjusting rod 600 abuts against the limit platform 500. At this time, the adjusting rod 600 cannot continue to rotate under the restriction of the limit platform 500. See attached Figure 6 As shown, that is, the adjusting rod 600 is restricted by the stopper 500 and cannot continue to rotate clockwise. At this time, the valve body sealing mechanism of the gate valve switches from the first state to the second state, the first end is located above the second end, and the distance from the first end to the second end in the first direction is the second preset value. Since the second preset value is greater than the first preset value, the inclination of the adjusting rod 600 increases at this time, and the gate 300 and the valve seat 400 switch from the vertical state to the inclined state. The sealing pressure between the gate 300 and the corresponding valve seat 400 is increased by the adjusting rod 600, and the sealing effect between the gate 300 and the corresponding valve seat 400 is improved.

[0029] Similarly, when the gate 300 is needed to open the channel 101 again, the valve stem 120 is rotated around its own axis, and the sleeve 200 is moved upward by the rotation of the valve stem 120. The upward movement of the sleeve 200 will drive the two gates 300 to move synchronously. At this time, the first end is located above the second end. In the process of the sleeve 200 driving the two gates 300 to move upward synchronously, the sleeve 200, the limit platform 500, the adjusting rod 600 and the gate 300 are all in a relatively static state.

[0030] When the gate 300 is above the channel 101 again and opens the channel 101, the gate 300 cannot continue to move upward under the restriction of the valve body 100. At this time, the sleeve 200 moves upward relative to the gate 300. The movement of the sleeve 200 will drive the second end of the adjusting rod 600 to move, so that the second end of the adjusting rod 600 moves upward relative to its first end, and the first end of the adjusting rod 600 will rotate relative to the gate 300, and the second end of the adjusting rod 600 will rotate relative to the sleeve 200. During the rotation of the adjusting rod 600, the gate 300 and the valve seat 400 corresponding to the gate 300 move in the first direction, and under the action of the first elastic member 320, the gate 300 and the valve seat 400 are gradually reset, so that the gate 300 and the valve seat 400 return to the vertical state.

[0031] Further, the valve seat 400 is slidably installed in the valve body 100 through the second elastic member 420. Specifically, a slideway 130 is provided in the valve body 100, and the valve seat 400 is slidably installed in the slideway 130 through the second elastic member 420. The second elastic member 420 is arranged along the first direction, and the second elastic member 420 is a spring.

[0032] The second elastic member 420 is provided to assist the valve seat 400 in resetting. In the initial state, the second elastic member 420 is in a natural state. When the valve seat 400 is tilted, the second elastic member 420 is in a deformed state and has a tendency to cause the valve seat 400 to return to a vertical position.

[0033] In this embodiment, a center plate 330 is disposed on each of the two gate plates 300, and the two center plates 330 are disposed face to face in the first direction. A rotational slide 340 is provided on each of the two center plates 330, and the rotational slide 340 is an arc-shaped groove. The two center plates 330 are connected by a center rotating block 350, and the center rotating block 350 rotates in cooperation with the two rotational slides 340. The center rotating block 350 is installed in the valve body 100 through a limiting rod 360, and the limiting rod 360 allows the center rotating block 350 to move in the second direction and limits the center rotating block 350 from moving in the first direction.

[0034] Specifically, the center rotating block 350 is fixedly connected to the limiting rod 360 and is an integrally formed structure. A limiting groove 140 is opened on the valve body 100, and the limiting groove 140 is arranged along the second direction. The limiting rod 360 is slidably installed in the limiting groove 140, so that the limiting rod 360 can move along the second direction and limit the movement of the limiting rod 360 in the first direction, and then the center rotating block 350 is limited to move in the first direction by the limiting rod 360, and the center rotating block 350 is allowed to move in the second direction.

[0035] In this embodiment, a center plate 330 is provided, and two center plates 330 are connected via a center rotating block 350. When the two gate plates 300 are pushed and rotated by the corresponding adjusting rods 600, the rotation of the two adjusting rods 600 is restricted by the rotating slide groove 340 and the center rotating block 350, so as to avoid excessive rotation freedom of the gate plates 300 and unnecessary deflection of the gate plates 300.

[0036] In another possible embodiment, the sleeve 200 includes an inner cylinder 210 and an outer cylinder 220. The inner cylinder 210 is screw-matched with the valve stem 120, and the outer cylinder 220 is screw-matched with the inner cylinder 210. The outer cylinder 220 can move up and down with the inner cylinder 210, and can rotate around its own axis relative to the inner cylinder 210. The limiting platform 500 is arranged on the outer cylinder 220 around the second direction, and is an integrally formed structure with the outer cylinder 220.

[0037] Specifically, the valve stem 120 is provided with a first spiral groove, and the inner circumferential wall surface of the inner cylinder 210 is provided with a first spiral protrusion, the first spiral protrusion is rotationally matched with the first spiral groove, and when the valve stem 120 rotates around its own axis, the inner cylinder 210 can move up and down. A second spiral protrusion is provided on the outer circumferential wall surface of the inner cylinder 210, and a second spiral groove is provided on the inner circumferential wall surface of the outer cylinder 220, the second spiral protrusion is rotationally matched with the second spiral groove, and the spiral lead angle of the first spiral protrusion is greater than the spiral lead angle of the second spiral protrusion, so that when the inner cylinder 210 moves up and down, the outer cylinder 220 can be driven to move synchronously, and the outer cylinder 220 can rotate around its own axis relative to the inner cylinder 210. And the outer cylinder 220 rotates around its own axis relative to the inner cylinder 210 to change the distance from the first end of the adjusting rod 600 to the second end of the adjusting rod 600 in the first direction, that is, to change the inclination degree of the adjusting rod 600, and then change the inclination degree of the gate 300.

[0038] In this embodiment, a plurality of rotating wedges 221 are arranged on the outer cylinder 220, and the plurality of rotating wedges 221 are evenly distributed on the outer cylinder 220 around the second direction. A matching cylinder 150 is arranged on the valve body 100, and the matching cylinder 150 is coaxially arranged with the valve stem 120 and can rotate around its own axis relative to the valve body 100. A plurality of matching wedges 151 are arranged on the inner circumferential wall surface of the matching cylinder 150, and the plurality of matching wedges 151 are evenly distributed on the inner circumferential wall surface of the matching cylinder 150 around the second direction, and a matching groove is defined between every two matching wedges 151 adjacently arranged around the second direction, and the plurality of matching grooves are arranged one-to-one with the plurality of rotating wedges 221, and each rotating wedge 221 can be inserted into the matching groove corresponding to the matching groove.

[0039] Specifically, an adjusting shaft 160 is rotatably provided on the valve body 100, the adjusting shaft 160 is arranged along the first direction and one end thereof extends into the valve body 100, the end of the adjusting shaft 160 extending into the valve body 100 is fixedly connected to a first bevel gear 170, and a second bevel gear 152 is coaxially and fixedly connected to the matching cylinder 150, and the second bevel gear 152 is meshed with the first bevel gear 170.

[0040] An annular protrusion is coaxially arranged on the mating cylinder 150, and the annular protrusion is arranged around the second direction on the outer peripheral wall surface of the mating cylinder 150. An annular groove is opened in the valve body 100, and the annular groove and the annular protrusion are rotatably matched, so that the mating cylinder 150 can rotate around its own axis relative to the valve body 100 and limit the up and down movement of the mating cylinder 150.

[0041] When in use, the valve stem 120 is rotated around its own axis, and the inner cylinder 210 drives the outer cylinder 220 to move upward through the rotation of the valve stem 120. After each rotating wedge block 221 can be inserted into the corresponding matching groove, the first bevel gear 170 is driven to rotate by rotating the adjusting shaft 160, and then the second bevel gear 152 is driven to rotate through the first bevel gear 170, so that the matching cylinder 150 can rotate around its own axis. The rotation of the matching cylinder 150 will drive the outer cylinder 220 to rotate, so that the outer cylinder 220 moves up and down relative to the inner cylinder 210, and then the limit platform 500 moves up and down, changing the distance between the limit platform 500 and the adjusting rod 600, and then changing the timing of the adjusting rod 600 contacting the limit platform 500. The more the limit platform 500 moves upward, the greater the degree to which the limit platform 500 allows the first end of the adjusting rod 600 to rotate (the adjusting rod 600 is attached to the limit platform 500). Figure 6 The closer the first end of the adjusting rod 600 is to the second end of the adjusting rod 600 in the first direction, the smaller the inclination of the gate 300. Conversely, the more downward the limit platform 500 is, the smaller the degree of rotation of the first end of the adjusting rod 600 allowed by the limit platform 500, and the farther the first end of the adjusting rod 600 is to the second end of the adjusting rod 600 in the first direction, the greater the inclination of the gate 300.

[0042] By setting the matching tube 150 and the outer tube 220 to cooperate, the inclination of the adjusting rod 600 is changed, and then the inclination of the gate plate 300 is adjusted. The greater the inclination of the gate plate 300, the greater the sealing pressure between the gate plate 300 and the corresponding valve seat 400, and the better the sealing effect.

[0043] In combination with the above embodiments, the specific working process is as follows: In the initial state, the two gate plates 300 are both located above the channel 101 and open the channel 101. At this time, the valve body sealing mechanism of the gate valve is in the first state, and the gate plates 300 and the valve seat 400 are both vertically arranged. When the gate plate 300 is needed to block the channel 101, the valve stem 120 is rotated around its own axis, and the sleeve 200 is moved downward by the rotation of the valve stem 120. The downward movement of the sleeve 200 will drive the two gate plates 300 to move synchronously. At this time, the second end is located above the first end, and the distance from the first end to the second end in the first direction is a first preset value. In the process of the sleeve 200 driving the two gate plates 300 to move downward synchronously, the sleeve 200, the limit platform 500, the adjusting rod 600 and the gate plate 300 are all in a relatively static state.

[0044] The second sealing ring 310 on the gate plate 300 slides along the first sealing ring 410 on the corresponding valve seat 400 until the second sealing ring 310 fits with the first sealing ring 410 and forms a sealing surface with the first sealing ring 410 and the second sealing ring 310 to block the channel 101. In this process, impurities between the first sealing ring 410 and the second sealing ring 310 will be cleaned to prevent impurities from being between the first sealing ring 410 and the second sealing ring 310 and damaging the sealing surface, thereby self-cleaning the sealing surface and improving the service life of the gate valve.

[0045] When the gate 300 blocks the channel 101, the gate 300 can no longer move. At this time, the valve stem 120 continues to rotate to make the sleeve 200 move downward relative to the gate 300. The movement of the sleeve 200 will drive the second end of the adjusting rod 600 to move, so that the second end of the adjusting rod 600 moves downward relative to its first end, and the first end of the adjusting rod 600 will rotate relative to the gate 300, and the second end of the adjusting rod 600 will rotate relative to the sleeve 200. Since the sleeve 200 cannot move, during the rotation of the adjusting rod 600, the adjusting rod 600 will cause the gate 300 and the valve seat 400 corresponding to the gate 300 to move in the first direction, thereby gradually tilting the gate 300 and the valve seat 400, and causing the first elastic member 320 to deform until the adjusting rod 600 abuts against the limit platform 500. At this time, the adjusting rod 600 cannot continue to rotate under the restriction of the limit platform 500. See attached Figure 6As shown, that is, the adjusting rod 600 is restricted by the stopper 500 and cannot continue to rotate clockwise. At this time, the valve body sealing mechanism of the gate valve switches from the first state to the second state, the first end is located above the second end, and the distance from the first end to the second end in the first direction is the second preset value. Since the second preset value is greater than the first preset value, the inclination of the adjusting rod 600 increases at this time, and the gate 300 and the valve seat 400 switch from the vertical state to the inclined state. The sealing pressure between the gate 300 and the corresponding valve seat 400 is increased by the adjusting rod 600, and the sealing effect between the gate 300 and the corresponding valve seat 400 is improved.

[0046] When the gate 300 is needed to open the passage 101 again, the valve stem 120 is rotated around its own axis, and the sleeve 200 is moved upward by the rotation of the valve stem 120. The upward movement of the sleeve 200 will drive the two gates 300 to move synchronously, so that the first sealing ring 310 on the gate 300 and the second sealing ring 410 on the corresponding valve seat 400 are relatively moved and separated. At this time, the first end is located above the second end. In the process of the sleeve 200 driving the two gates 300 to move synchronously upward, the sleeve 200, the limit platform 500, the adjustment rod 600 and the gate 300 are all in a relatively static state. And the valve body sealing mechanism of the gate valve is in the third state, the gate plate 300 and the valve seat 400 are both inclined. Since the gate plate 300 and the valve seat 400 are both inclined at this time, the gate plate 300 has a slope. During the opening process of the channel 101, the first sealing ring 310 on the gate plate 300 and the second sealing ring 410 on the corresponding valve seat 400 can be separated faster, reducing the wear of the sealing surface.

[0047] When the gate 300 is above the channel 101 again and opens the channel 101, the gate 300 cannot continue to move upward under the restriction of the valve body 100. At this time, the sleeve 200 moves upward relative to the gate 300. The movement of the sleeve 200 will drive the second end of the adjusting rod 600 to move, so that the second end of the adjusting rod 600 moves upward relative to its first end, and the first end of the adjusting rod 600 will rotate relative to the gate 300, and the second end of the adjusting rod 600 will rotate relative to the sleeve 200. During the rotation of the adjusting rod 600, the gate 300 and the valve seat 400 corresponding to the gate 300 move in the first direction, and under the action of the first elastic member 320, the gate 300 and the valve seat 400 are gradually reset, so that the gate 300 and the valve seat 400 return to the vertical state.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve body sealing mechanism for a gate valve, characterized in that: It comprises a valve body, a sleeve, two gate plates and two valve seats; the valve body has a passage running through it in a first direction, the first direction being a horizontal direction; the valve body is provided with a valve cover, the valve cover is provided with a valve stem, the valve stem is provided in a second direction and can rotate around its own axis, the second direction being a vertical direction; the sleeve is provided on the valve stem, and the valve stem can move up and down by rotating around its own axis; the two gate plates are provided on the valve body and are symmetrically arranged about the vertical center axis of the valve stem, and the two gate plates can move up and down to open or block the passage; the two valve seats are provided in the passage and can slide in the passage in a first direction, each valve seat is provided corresponding to a gate plate, and each valve seat is located on the side of the gate plate provided corresponding to it, away from the valve stem in the first direction; each valve seat is provided with a first sealing ring, each gate plate is provided with a second sealing ring, and the first sealing ring and the corresponding second sealing ring are provided face to face in the first direction; The valve body sealing mechanism of the gate valve has a first state, a second state, a third state and a fourth state. When in the first state, the sleeve moves downward synchronously with the gate plate, and the gate plate and the valve seat are both vertically arranged. When in the second state, the sleeve moves downward relative to the gate plate, and the gate plate and the valve seat are both inclined. When in the third state, the sleeve moves upward synchronously with the gate plate, and the gate plate and the valve seat are both inclined. When in the fourth state, the sleeve moves upward relative to the gate plate, and the gate plate and the valve seat are both vertically arranged.

2. The valve body sealing mechanism of a gate valve according to claim 1, characterized in that: The valve stem is a threaded rod, the sleeve is spirally matched with the valve stem, and when the valve stem rotates around its own axis, the sleeve can move up and down.

3. The valve body sealing mechanism of a gate valve according to claim 2, characterized in that: It also includes a limit platform and two adjusting rods, the limit platform is coaxial with the sleeve and is arranged on the sleeve around the second direction, the two adjusting rods are arranged one by one with the two gate plates, the adjusting rod has a first end and a second end, the first end is rotatably connected to the gate plate corresponding to it, and the second end is rotatably connected to the sleeve; the two gate plates are connected by a first elastic member, the first elastic member is arranged along the first direction, and when the valve body sealing mechanism of the gate valve is in the first state and the fourth state, the second end is located above the first end, and the distance from the first end to the second end in the first direction is a first preset value, when the valve body sealing mechanism of the gate valve is in the second state and the third state, the first end is located above the second end, and the distance from the first end to the second end in the first direction is a second preset value, and the second preset value is greater than the first preset value.

4. The valve body sealing mechanism of a gate valve according to claim 1, characterized in that: The valve seat is slidably mounted in the valve body through a second elastic member, and the second elastic member is arranged along the first direction.

5. The valve body sealing mechanism of a gate valve according to claim 1, characterized in that: A center plate is provided on both gate plates, and the two center plates are arranged face to face in the first direction. A rotating slide groove is provided on both center plates, and the rotating slide groove is an arc-shaped groove. The two center plates are connected by a center rotating block, and the center rotating block rotates with the two rotating slide grooves; the center rotating block is installed in the valve body through a limit rod, and the limit rod allows the center rotating block to move in the second direction and limits the center rotating block from moving in the first direction.

6. The valve body sealing mechanism of a gate valve according to claim 5, characterized in that: The central rotating block is fixedly connected to the limiting rod, a limiting groove is arranged on the valve body, the limiting groove is arranged along the second direction, and the limiting rod is slidably installed in the limiting groove.

7. The valve body sealing mechanism of a gate valve according to claim 3, characterized in that: The sleeve includes an inner tube and an outer tube; the inner tube is spirally matched with the valve stem, and the outer tube is threadedly matched with the inner tube. The outer tube can move up and down with the inner tube, and can rotate around its own axis relative to the inner tube; the limit platform is arranged on the outer tube around the second direction, and is an integrally formed structure with the outer tube.

8. The valve body sealing mechanism of a gate valve according to claim 7, characterized in that: A first spiral groove is provided on the valve stem, and a first spiral protrusion is provided on the inner circumferential wall surface of the inner cylinder. The first spiral protrusion is rotationally matched with the first spiral groove, and when the valve stem rotates around its own axis, the inner cylinder can move up and down; a second spiral protrusion is provided on the outer circumferential wall surface of the inner cylinder, and a second spiral groove is provided on the inner circumferential wall surface of the outer cylinder. The second spiral protrusion is rotationally matched with the second spiral groove, and the spiral lead angle of the first spiral protrusion is greater than the spiral lead angle of the second spiral protrusion.

9. The valve body sealing mechanism of a gate valve according to claim 8, characterized in that: A plurality of rotating wedge blocks are arranged on the outer cylinder, and the plurality of rotating wedge blocks are evenly distributed on the outer cylinder around the second direction; a matching cylinder is arranged on the valve body, and the matching cylinder is coaxially arranged with the valve stem and can rotate around its own axis relative to the valve body; a plurality of matching wedge blocks are arranged on the inner circumferential wall surface of the matching cylinder, and the plurality of matching wedge blocks are evenly distributed on the inner circumferential wall surface of the matching cylinder around the second direction, and a matching groove is defined between every two matching wedge blocks adjacently arranged around the second direction, and the plurality of matching grooves are arranged one-to-one correspondingly to the plurality of rotating wedge blocks, and each rotating wedge block can be inserted into its corresponding matching groove.

10. The valve body sealing mechanism of a gate valve according to claim 9, characterized in that: An adjusting shaft is rotatably arranged on the valve body. The adjusting shaft is arranged along a first direction and one end of the adjusting shaft extends into the valve body. A first bevel gear is fixedly connected to the end of the adjusting shaft extending into the valve body. A second bevel gear is coaxially and fixedly arranged on the matching cylinder. The second bevel gear meshes with the first bevel gear.

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