Double-valve-plate adjustable gate valve used on steam pipeline

Abstract

The invention discloses a double-valve-plate adjustable gate valve used on a steam pipeline, and relates to the technical field of gate valves, the double-valve-plate adjustable gate valve comprises a valve body, the valve body is provided with a steam inlet channel and a steam outlet channel which are transversely arranged, and a valve cavity which is vertically arranged; valve plates used for opening or closing the valve cavity are arranged at the connecting openings of the steam inlet channel and the valve cavity and the connecting openings of the steam outlet channel and the valve cavity respectively, the two valve plates are vertically arranged in parallel, and the two annular clamping grooves are formed in the connecting openings of the steam inlet channel and the valve cavity and the connecting openings of the steam outlet channel and the valve cavity respectively. The outer diameter of the convex ring is the same as that of the valve plates, and the convex ring is mounted at the opposite ends of the two valve plates and extends; according to the check valve, when the valve plate moves to enable the convex ring to move into the annular clamping groove, the convex ring firstly makes contact with the blocking part and pushes the blocking part to drive the sealing ring to move in the annular clamping groove, direct friction between the convex ring and the sealing ring is avoided when the convex ring is inserted into the annular clamping groove, the sealing ring has an extending space, and friction deformation of the convex ring when the convex ring enters the annular clamping groove is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of gate valves, in particular to a double-valve-plate adjustable gate valve used on a steam pipeline. Background Art

[0002] The double-disc gate valve is a parallel gate valve. The two valve plates are installed in a spectacle-type spectacle plate assembly. When the valve is closed, the two valve plates are propped open by wedges and pressed tightly against the valve seat to form a forced seal. During the valve switching process, the valve plate is always close to the guide plate. The valve plate moves without gaps in the guide plate to form a floating seal to prevent the medium from entering the valve cavity during the switching process. When the valve is fully opened, it is equivalent to a straight-through pipeline. The guide hole assembly and the valve seat form an elastic seal to prevent the medium from entering the valve cavity. The action of this valve is divided into two steps. When closed, the valve plate moves into place before propping up the seal. When opened, the valve plate shrinks and then moves upward.

[0003] There will inevitably be certain size deviations and shape errors between the flow port and the valve plate during the processing and installation process. If the valve plate is simply moved down to block the flow port, it is difficult to ensure that the valve plate and the flow port are closely fitted in all directions. There will be a small gap in some parts, resulting in medium leakage. Therefore, in the prior art, when the double valve plate in the double valve plate gate valve moves down to the flow port, the two plates in the double valve plate will move away from each other, respectively contact the two side walls of the port, and then achieve closure to prevent gas leakage; Since the double valve plate will inevitably rub against the inner wall of the flow port in the gate valve during movement, the double valve plate and the channel port will rub against each other. The continuous friction will gradually wear the double valve plate and the inner wall surface of the flow port, causing their size and shape to change, resulting in poor sealing effect, making it easy for gas leakage to occur between the gate plate and the channel in the valve body; In the prior art, wear is mostly reduced by installing rubber sealing pads on the inner wall of the channel or the outer wall of the valve plate, and then the inner wall of the channel or the outer wall of the valve plate will rub along the outer wall of the rubber seal. However, first of all, although the rubber sealing pad is relatively soft, its surface is not absolutely smooth at the microscopic level, which will increase friction. Moreover, during the friction process of the rubber sealing pad, the rubber sealing pad will be stretched due to friction and then deformed. There is a hysteresis phenomenon in the deformation and recovery process of the rubber, and part of the energy will be dissipated in the form of heat energy, which is the hysteresis loss. At the same time, there is internal friction between the rubber molecular chains. During the movement of the valve plate, the rubber sealing pad is constantly deformed and recovered. The hysteresis loss and internal friction will continue to consume energy, which is converted into friction that hinders the movement of the valve plate, making it difficult for the valve plate to move along the inner wall of the channel. Summary of the invention

[0004] The object of the present invention is to provide a double-valve-plate adjustable gate valve for use on a steam pipeline to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides a double valve plate adjustable gate valve for steam pipeline, comprising a valve body, wherein the valve body has two transversely arranged steam inlet channels and steam outlet channels and a vertically arranged valve cavity, wherein the steam inlet channel and the steam outlet channel are respectively provided with valve plates for opening or closing the valve cavity at the connection openings with the valve cavity, and the two valve plates are vertically arranged in parallel, and further comprising: Two annular grooves are respectively arranged along the steam inlet channel and the steam outlet channel at the connection openings with the valve cavity; a convex ring has an outer diameter the same as that of the valve plate and is installed and extended at the opposite ends of the two valve plates, and the convex ring is matched with the annular grooves; The sealing ring has a fixed end connected to the side wall of the valve cavity, and a movable end thereof extends along the side wall of the valve cavity and is bent into the annular groove, and the length of the sealing ring bent into the annular groove is not less than the depth of the annular groove; the blocking part is sleeved on the annular groove, the movable end of the sealing ring is connected to the blocking part, and the blocking part is partially protruding from the surface of the sealing ring, and the spacing between the inner ring wall of the convex ring and the inner ring of the annular groove is not less than the thickness of the sealing ring, so that when the convex ring extends into the annular groove, the blocking part is pushed to drive the movable end of the sealing ring to move.

[0006] Furthermore, it comprises a plurality of strip slideways which are arranged on the inner bottom wall of the annular groove at equal intervals along the circumferential direction of the annular groove, and a sliding group is arranged in the strip slideways; The sliding group includes a plurality of balls arranged at equal intervals along the axial direction of the strip slide. An outlet is provided at one end of the strip slide away from the valve body. The ball diameter of the ball is larger than the outlet of the strip slide, and a part of the ball extends through the outlet and is higher than the inner bottom wall of the annular groove. The inner wall of the blocking part abuts against the outer wall of the ball.

[0007] Furthermore, a reset member is provided in the annular groove, and the reset member includes a sliding groove, which is provided on one side of the annular groove and communicated with the annular groove, and the sliding groove corresponds to the blocking part horizontally; a sliding block, one end of which is connected to a side of the blocking part away from the sealing ring, and the other end of which extends to the inside of the sliding groove and is slidably connected to the inner wall of the sliding groove, and the inner wall of the sliding block and the blocking part are both against the outer wall of the ball; Multiple elastic members are arranged in the sliding groove and are arranged at equal intervals along the circumferential direction of the sliding groove. One end of the elastic member is connected to the inner wall of the sliding groove, and the other end is connected to one end of the slider. When the slider moves with the blocking part and squeezes the elastic member, the slider and the blocking part are pushed back to their original positions.

[0008] Furthermore, the inner wall of the blocking part is provided with a plurality of buckle grooves, the number of the buckle grooves is the same as the number of the strip slides, the buckle grooves are arranged at equal intervals along the circumferential direction of the blocking part, each buckle groove corresponds to one of the strip slides, the two sides of the buckle groove protrude from the inner wall of the blocking part and extend into the interior of the strip slide, the buckle groove is adapted to the ball bearings, the inner wall of the buckle groove is abutted against the outer wall of the ball bearings, and when the blocking part moves, the buckle groove slides along the plurality of ball bearings in sequence.

[0009] Furthermore, it also includes a placement groove, which is opened in the valve cavity of the valve body and is located between the annular clamping groove and the buckle groove. The placement groove is connected to the annular clamping groove and the sliding groove. The placement groove corresponds horizontally to the blocking part and is adapted to the shape of the blocking part.

[0010] Furthermore, it also includes an elastic plate, which is obliquely arranged between the sealing ring and the inner wall of the valve cavity. One end of the elastic plate is connected to the inner wall of the valve body valve cavity, and the other end is inclined toward the center of the valve cavity and abuts against the outer wall of the sealing ring, thereby stretching the sealing ring away from the valve plate.

[0011] Furthermore, it also includes a support ring, which is installed on the side of the annular groove away from the sliding groove. The end of the sealing ring that is not connected to the valve body extends beyond the support ring into the annular groove. One side of the support ring is set as an arc surface, and the outer wall of the sealing ring is against the arc surface of the support ring.

[0012] Furthermore, the outer wall of the support ring is connected to a water-absorbing pad, the outer wall of the water-absorbing pad is against the outer wall of the sealing ring, the support ring and the valve body are both provided with a plurality of through holes, the through holes on the support ring correspond to the through holes on the valve body and are interconnected, the valve body is provided with a plurality of first water guide grooves and second water guide grooves, the first water guide grooves and the second water guide grooves are arranged at equal intervals along the circumferential direction of the annular groove, the first water guide grooves and the second water guide grooves are inclined and connected to each other, the first water guide grooves are connected to a plurality of through holes, the valve body is provided with a plurality of water outlets, some of the water outlets are connected to the steam inlet channel, and the remaining water outlets are connected to the steam outlet channel.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, when the valve plate moves to move the convex ring into the annular groove, the convex ring first contacts and pushes the blocking portion to drive the sealing ring to move in the annular groove, thereby avoiding direct friction between the convex ring and the sealing ring when the convex ring is inserted into the annular groove. The sealing ring has space to stretch, thereby avoiding friction deformation of the convex ring when it enters the annular groove.

[0014] 2. In the present invention, the elastic plate is used to prop up the sealing ring to prevent the sealing ring from being subjected to incorrect force due to the proximity of the convex ring, so that the sealing ring bulges toward the center of the steam channel port to prevent it from bulging abnormally. The elastic plate itself is elastic and will be squeezed and tilted when the sealing ring moves. It can recover after deformation and can use its own elasticity to prop up the sealing ring again after the valve plate leaves. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the external structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 is a schematic diagram of the blocking portion and the sealing ring in the present invention; Figure 4 It is a schematic diagram of the connection structure between the valve plate and the convex ring in the present invention; Figure 5 It is a schematic diagram of the connection structure between the slider and the elastic member in the present invention; Figure 6 It is a schematic diagram of the connection structure between the convex ring and the annular groove in the present invention; Figure 7 It is a schematic diagram of the connection structure between the strip slideway and the ball in the present invention; Figure 8 for Figure 2 A magnified view of the structure at center A; Fig. 9 for Figure 2 A magnified view of the structure at B in the middle; Fig.10 for Figure 3 A magnified view of the structure at C in the middle; Fig.11 for Figure 6 A magnified view of the structure at D in the middle; Fig.12 for Figure 6 Enlarged view of the structure at E in the middle.

[0016] In the figure: 1. valve body; 2. Steam inlet channel; 3. Steam outlet channel; 4. Valve plate; 5. Moving block; 6. Extrusion groove; 7. Extrusion block; 8. Valve stem; 9. Sealing ring; 10. Pad; 11. Convex ring; 12. Elastic plate; 13. Sliding block; 14. Blocking part; 15. Placement groove; 16. Sliding groove; 17. Elastic member; 18. Strip slide; 19. Ball; 20. Support ring; 21. Water absorbent pad; 22. First water guide groove; 23. Second water guide groove; 24. Water outlet; 25. Annular groove; 26. Buckle groove; 27. Through hole. DETAILED DESCRIPTION

[0017] 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.

[0018] The present invention provides a technical solution: See also Figure 1-Figure 12 As shown, a double valve plate adjustable gate valve for a steam pipeline includes a valve body 1, the valve body 1 has two transversely arranged steam inlet channels 2 and steam outlet channels 3 and a vertically arranged valve cavity, the steam inlet channel 2 and the steam outlet channel 3 are respectively provided with valve plates 4 for opening or closing the valve cavity at the connection openings with the valve cavity, the two valve plates 4 are vertically arranged in parallel, and also include, Two annular grooves 25 are respectively arranged along the steam inlet channel 2 and the steam outlet channel 3 at the connection openings with the valve cavity; the convex ring 11 has an outer diameter the same as that of the valve plate 4 and is installed on the opposite ends of the two valve plates 4, and the convex ring 11 is matched with the annular grooves 25; The sealing ring 9 has a fixed end connected to the side wall of the valve cavity, and a movable end extending along the side wall of the valve cavity and bent into the annular groove 25. The length of the sealing ring 9 bent into the annular groove 25 is not less than the depth of the annular groove 25. The blocking portion 14 is sleeved on the annular groove 25, and the moving end of the sealing ring 9 is connected to the blocking portion 14. The blocking portion 14 is partially protruding from the surface of the sealing ring 9. The distance between the inner ring wall of the convex ring 11 and the inner ring of the annular groove 25 is not less than the thickness of the sealing ring 9. When the convex ring 11 extends into the annular groove 25, the blocking portion 14 is pushed to drive the moving end of the sealing ring 9 to move.

[0019] The steam inlet channel 2 corresponds to the steam outlet channel 3 horizontally, the valve cavity of the valve body 1 is located between the steam inlet channel 2 and the steam outlet channel 3, and the valve cavity is connected with the steam inlet channel 2 and the steam outlet channel 3. Two valve plates 4 are located in the valve cavity of the valve body 1. When the valve plate 4 moves upward, it will move away from the end corresponding to the steam inlet channel 2 and the steam outlet channel 3, and then the steam enters the valve cavity of the valve body 1 from the steam inlet channel 2, and then enters the steam outlet channel 3 to be transmitted to other places. When the valve plate 4 moves downward and blocks the end corresponding to the steam inlet channel 2 and the steam outlet channel 3, the steam in the steam inlet channel 2 is blocked by the valve plate 4, and thus cannot enter the steam outlet channel 3 to be further transported; The inner wall of the valve body 1 is provided with two annular grooves 25, the annular grooves 25 are adapted to the convex ring 11, and the end of the valve plate 4 corresponding to the annular groove 25 is fixedly connected to the convex ring 11. Figure 2 From the perspective of, a moving block 5 is fixedly installed at one end corresponding to the two valve plates 4, the outer walls of the two moving blocks 5 are butted against each other, and the corresponding outer walls of the two moving blocks 5 are provided with an extrusion groove 6, and an extrusion block 7 is adapted in the extrusion groove 6, and there is a gap between the bottom end of the extrusion block 7 and the bottom end of the extrusion groove 6, the outer wall of the extrusion block 7 is butted against the inner wall of the extrusion groove 6, and a valve stem 8 is fixedly installed on the top of the extrusion block 7; Still Figure 2 From the perspective of the embodiment of the present invention, the valve stem 8 can be driven to move up or down by a driving component such as an electric telescopic rod, a cylinder or a hydraulic rod. When the valve stem 8 is driven to move up, the portion of the extrusion block 7 located between the two extrusion grooves 6 will first move upward along the inside of the extrusion groove 6. When the inner bottom wall of the extrusion block 7 abuts against the inner top wall of the extrusion groove 6, the extrusion block 7 will pull the two moving blocks 5 and the two valve plates 4 to move upward together, so that the valve plates 4 move upward away from the ports corresponding to the steam inlet channel 2 and the steam outlet channel 3, so that the steam can pass through the valve cavity of the valve body 1. When the valve stem 8 is driven to move downward, the valve stem 8 and the extrusion block 7 move downward to make the moving block 5 and the valve plate 4 move downward together. When the bottoms of the two moving blocks 5 hit the outer wall of the cushion block 10, the valve plate 4 and the moving block 5 stop moving downward. Then, since there is a gap between the bottom end of the extrusion block 7 and the bottom end of the extrusion groove 6, the valve stem 8 and the extrusion block 7 continue to move downward. The extrusion block 7 squeezes the two extrusion grooves 6. After the extrusion grooves 6 are squeezed, the two moving blocks 5 move away from each other, and then the two valve plates 4 move away from each other together. Still like Figure 2 From the perspective of FIG, after the two valve plates 4 move away from each other, the left valve plate 4 will translate toward the direction of the steam inlet channel 2, while the right valve plate 4 will translate toward the direction of the steam outlet channel 3. The valve plate 4 moves together with the convex ring 11. It is worth noting that when the bottom of the moving block 5 contacts the outer wall of the cushion block 10, the moving block 5 and the valve plate 4 can no longer move downward. At this time, the bottom of the valve plate 4 is not in contact with the inner wall of the valve cavity between the steam inlet channel 2 and the steam outlet channel 3. Figure 6 From the perspective of FIG, the width of the annular groove 25 is the same as that of the convex ring 11, but the diameter of the annular groove 25 is larger than that of the convex ring 11. Therefore, when the convex ring 11 is inserted into the annular groove 25, the outer wall of the convex ring 11 will not contact the inner top wall of the annular groove 25, and the inner wall of the convex ring 11 will not contact the inner bottom wall of the annular groove 25. like Figure 4 The convex ring 11 protrudes from one end of the valve plate 4, and then Figure 8 From the perspective of, the initial position of the blocking portion 14 is on the right side of the annular groove 25. Since the blocking portion 14 and the convex ring 11 are both annular, the inner ring wall of the blocking portion 14 and the convex ring 11 is the inner wall, and the outer ring is the outer wall. The inner wall of the blocking portion 14 abuts against the inner bottom wall of the annular groove 25. One end of the sealing ring 9 is fixedly connected to the inner wall of the valve cavity of the valve body 1, and the other end goes around from the valve cavity to the inside of the annular groove 25, and then is fixedly connected to the outer wall of the blocking portion 14. Since the sealing ring 9 is relatively wide and the blocking portion 14 is close to the edge of the annular groove 25, a small area of ​​the sealing ring 9 is located inside the annular groove 25, and the remaining wider area hangs down in the valve cavity; exist Figure 5It can be clearly seen that after one end of the sealing ring 9 is connected to the valve cavity and the other end is connected to the blocking portion 14, a cavity is formed between the sealing ring 9 and a part of the valve cavity. Figure 8 From the perspective of FIG. 2 , when the convex ring 11 and the valve plate 4 move toward the direction of the annular groove 25 together, the convex ring 11 first contacts the convex ring 11 when it moves toward the inside of the annular groove 25, and then the convex ring 11 continues to move and pushes the blocking portion 14 to move toward the inside of the annular groove 25. During the movement, the convex ring 11 pulls the sealing ring 9 to move together, so that the originally hanging part of the sealing ring 9 is gradually tightened, and the cavity between the sealing ring 9 and a part of the valve cavity is gradually reduced, and the outer wall of the sealing ring 9 slides along the inner bottom wall of the annular groove 25, and then when the convex ring 11 is far away Before one end of the valve plate 4 is close to the inner wall of the annular groove 25, the end of the valve plate 4 corresponding to the annular groove 25 will first contact the outer wall of the sealing ring 9 and be squeezed with the sealing ring 9. Since the sealing ring 9 is made of elastic rubber material, the sealing ring 9 will be elastically deformed after being squeezed by the valve plate 4 for a moment, and then a small buffering effect will be produced on the collision force of the valve plate 4, thereby reducing the impact force of the convex ring 11 on the inner wall of the annular groove 25, and then the valve plate 4 and the convex ring 11 will continue to move, so that the end of the convex ring 11 away from the valve plate 4 just abuts against the inner wall of the annular groove 25; At this time, the outer wall of the sealing ring 9 is tightly against the valve plate 4, and the convex ring 11 has been inserted into the annular groove 25 and is against the inner wall of the annular groove 25. At this time, the steam inlet channel 2 and the steam outlet channel 3 are blocked by the valve plate 4, so that the valve cavity of the valve body 1 is not connected with the steam inlet channel 2 and the steam outlet channel 3. Figure 6 From the perspective of , the outer wall of the sealing ring 9 abuts against the valve plate 4 to form a first seal, and the inner wall of the convex ring 11 abuts against the outer wall of the sealing ring 9 to form a second seal, and then the end of the convex ring 11 away from the valve plate 4 abuts against the inner wall of the annular groove 25 to form a third seal, and the gap between the outer wall of the convex ring 11 and the inner top wall of the annular groove 25 is connected to the valve cavity of the valve body 1, so that the valve cavity is separated from the steam inlet channel 2 and the steam outlet channel 3, and there are gaps between the outer wall of the convex ring 11 and the inner top wall of the annular groove 25, as well as between the inner wall of the convex ring 11 and the inner bottom wall of the annular groove 25, so when the convex ring 11 is inserted into the annular groove 25, no friction occurs between the two; Since the convex ring 11 does not directly generate relative movement friction with the sealing ring 9, but pushes the blocking portion 14, and then the blocking portion 14 drives the sealing ring 9 to move, the sealing ring 9 mainly changes in its own extension, and does not undergo tensile deformation itself, and the sealing ring 9 has more extension space, even if the sealing ring 9 slides along the inner bottom wall of the annular groove 25 and friction occurs, the sealing ring 9 will curl in some areas and will not be forcibly stretched and deformed. Therefore, the direct contact friction between the sealing ring 9 and the convex ring 11 is greatly reduced, thereby effectively reducing the friction force; The material of the sealing ring 9 can be, for example, silicone rubber, which can maintain stable performance in a temperature range of -60°C to 200°C or even wider, and has excellent flexibility and elasticity, can withstand a certain degree of deformation and impact, and can play a good buffering role. When subjected to pressure, the silicone rubber can be compressed and deformed, and can quickly return to its original shape after the pressure is removed. In addition, the surface of the silicone rubber is relatively smooth, which can reduce friction. Since the two sealing rings 9 correspond to the openings in the steam inlet channel 2 and the steam outlet channel 3 respectively, the steam The steam will float to the outer wall of the sealing ring 9. When the outer wall of the sealing ring 9 is stained with water mist in the steam, the outer wall of the sealing ring 9 will become smooth due to the water. Therefore, when the outer wall of the sealing ring 9 contacts the convex ring 11, the contact surface between the sealing ring 9 and the convex ring 11 will be relatively smooth, thereby further reducing the friction between the contact surfaces between the sealing ring 9 and the convex ring 11. Moreover, when the outer wall of the sealing ring 9 contacts the inner wall of the convex ring 11, the excess water mist will be squeezed out and slide down along the outer wall of the sealing ring 9, so that it will not enter the inner part of the annular groove 25 too much. It is worth mentioning that, generally speaking, as long as the annular groove 25 is enlarged and then the convex ring 11 is inserted into the annular groove 25 so that the outer wall of the convex ring 11 is against the inner wall of the annular groove 25, not only can it be sealed, but also no friction will occur between the inner wall of the annular groove 25 and the outer wall of the convex ring 11. However, first of all, the moving distance of the valve plate 4 is limited, and the outer wall of the convex ring 11 and the inner wall of the annular groove 25 simply abut against each other, which will still cause wear. Wear is not only caused by movement friction. This is because the surface of any object looks smooth, but in fact there are many uneven tiny protrusions and depressions at the microscopic level, which is what we call roughness. When a collision occurs, the impact force will cause these microstructures to squeeze and deform each other. Therefore, the mutual contact between the convex ring 11 and one side of the annular groove 25 alone is not enough to ensure sealing. Therefore, in the prior art, an inward groove like the annular groove 25 is opened for these protrusions such as the convex ring 11 to be inserted, the purpose of which is to increase the contact area to ensure sealing.

[0020] See also Figure 5-Figure 11 , comprising a plurality of strip slideways 18, which are arranged on the inner bottom wall of the annular groove 25 at equal intervals along the circumferential direction of the annular groove 25, and a sliding group is provided in the strip slideway 18; The sliding group includes a plurality of balls 19 arranged equidistantly along the axial direction of the strip slide 18. An outlet is provided at one end of the strip slide 18 away from the valve body 1. The ball diameter of the ball 19 is larger than the outlet of the strip slide 18. Part of the area of ​​the ball 19 extends through the outlet and is higher than the inner bottom wall of the annular groove 25. The inner wall of the blocking portion 14 abuts against the outer wall of the ball 19.

[0021] by Fig.10From the perspective of the embodiment of the present invention, the inner bottom wall of the annular groove 25 is provided with a plurality of strip slideways 18, each of which has the same spacing, and each of which has an equal number of balls 19, which are arranged in a row inside the strip slideways 18, and the strip slideways 18 fit the shape of the balls 19, and the balls 19 are not connected to the strip slideways 18, so the balls 19 can rotate inside the strip slideways 18, and since the strip-shaped outlet width of the strip slideways 18 is narrow, the balls 19 cannot fall from the strip slideways 18, and only a part of the balls 19 is allowed to extend from the outlet, and since a part of the balls 19 extending out of the outlet protrudes from the inner bottom wall of the annular groove 25, when the blocking portion 14 and the sealing ring 9 move along the inner bottom wall of the annular groove 25, at this time, Figure 5 and Figure 7 From the perspective of , the inner wall of the blocking portion 14 will slide along the outer wall of the ball 19, and the outer wall of the sealing ring 9 will also slide along the outer wall of the ball 19. The ball 19 will roll in the strip slide 18 due to the friction between the blocking portion 14 and the sealing ring 9, thereby reducing the friction of the blocking portion 14 and the sealing ring 9 on the inner bottom wall of the annular groove 25 during movement.

[0022] See also Figure 5-Figure 10 A reset member is provided in the annular groove 25, and the reset member includes: The sliding groove 16 is arranged at one side of the annular groove 25 and communicates with the annular groove 25. The sliding groove 16 corresponds to the blocking portion 14 horizontally. The sliding block 13 has one end fixedly connected to a side of the blocking portion 14 away from the sealing ring 9, and the other end extends to the inside of the sliding groove 16 and is slidably connected to the inner wall of the sliding groove 16. The inner walls of the sliding block 13 and the blocking portion 14 are both against the outer wall of the ball 19. Multiple elastic members 17 are arranged in the sliding groove 16 at equal intervals along the circumferential direction of the sliding groove 16. One end of the elastic member 17 is fixedly connected to the inner wall of the sliding groove 16, and the other end is fixedly connected to one end of the slider 13. When the slider 13 moves with the blocking portion 14 and squeezes the elastic member 17, the slider 13 and the blocking portion 14 are pushed back to their original positions.

[0023] The valve body 1 is provided with two sliding grooves 16, which are respectively located on one side of the annular groove 25 on both sides. Figure 5From the perspective of FIG, the sliding groove 16 is provided inside the annular groove 25. The sliding groove 16 is the same as the annular groove 25 and is also annular. When the blocking portion 14 moves toward the sliding groove 16, the blocking portion 14 will drive the slider 13 to move together, and the slider 13 will slide along the inner wall of the sliding groove 16 when moving. The sliding of the slider 13 and the sliding groove 16 provides a guide for the blocking portion 14, and at the same time prevents the blocking portion 14 from tilting when moving. When the slider 13 moves along the sliding groove 16, it will squeeze a plurality of elastic members 17. When the valve plate 4 and the convex ring 11 move up and away, the elastic member 17 will use its own elastic properties to push the slider 13 toward the direction of the annular groove 25, thereby pushing the slider 13 and the blocking portion 14 back to the initial position. The elastic member 17 can be a spring or other elastic object that can restore to its original state after being squeezed, so that the slider 13 and the blocking portion 14 can be pushed back to the initial position.

[0024] See also Figure 7 The inner wall of the blocking portion 14 is provided with a plurality of buckle grooves 26, and the number of the buckle grooves 26 is the same as that of the strip slides 18. The buckle grooves 26 are arranged at equal intervals along the circumferential direction of the blocking portion 14, and each buckle groove 26 corresponds to one of the strip slides 18. Both sides of the buckle groove 26 protrude from the inner wall of the blocking portion 14 and extend into the interior of the strip slide 18. The buckle groove 26 is adapted to the ball 19, and the inner wall of the buckle groove 26 abuts against the outer wall of the ball 19, so that when the blocking portion 14 moves, the buckle groove 26 slides along the plurality of ball 19 in sequence.

[0025] Since the protruding two sides of the buckle groove 26 are inserted into the strip slide 18, the blocking part 14 will move along the inside of the strip slide 18 through the buckle groove 26 when moving, and the ball 19 will also rotate between the buckle groove 26 and the strip slide 18. The way in which the buckle groove 26 is inserted into the strip slide 18 can ensure that the blocking part 14 can be more stably connected to the strip slide 18, and the blocking part 14 can move horizontally, while also preventing the blocking part 14 from rotating.

[0026] See also Figure 5-Figure 10 , and also includes a placement groove 15, which is opened in the valve cavity of the valve body 1 and is located between the annular groove 25 and the buckle groove 26. The placement groove 15 is connected with the annular groove 25 and the sliding groove 16. The placement groove 15 corresponds horizontally to the blocking portion 14 and is adapted to the shape of the blocking portion 14.

[0027] In order to ensure that the end of the convex ring 11 away from the valve plate 4 can abut against the inner wall of the annular groove 25, two placement grooves 15 are provided on the valve body 1. The two placement grooves 15 are also annular and are respectively located in the two annular grooves 25. The placement grooves 15 are located between the sliding groove 16 and the annular groove 25 and are adapted to the size of the blocking portion 14. Figure 6From the perspective of , when the end of the convex ring 11 away from the valve plate 4 abuts against the inner wall of the annular groove 25, the blocking portion 14 is also inserted into the annular groove 25, so that the contact surface of the convex ring 11 and the annular groove 25 abuts against each other to form a seal.

[0028] See also Figure 5-Figure 8 , and also includes an elastic plate 12, which is obliquely arranged between the sealing ring 9 and the inner wall of the valve cavity. One end of the elastic plate 12 is fixedly connected to the inner wall of the valve cavity of the valve body 1, and the other end is inclined toward the center of the valve cavity and abuts against the outer wall of the sealing ring 9, thereby stretching the sealing ring 9 away from the valve plate 4.

[0029] The elastic plate 12 is also annular and is located in the cavity between the sealing ring 9 and the valve cavity wall. The initial shape of the elastic plate 12 is Figure 5 As can be seen from the figure, the elastic plate 12 is initially in a ring-shaped tilted state. Figure 5 The figure is a cross section of the elastic plate 12, so one end of the elastic plate 12 looks like it is tilted to the lower right, but in fact the elastic plate 12 is a complete closed loop. Figure 3 The complete form of the middle elastic plate 12; Therefore, the function of the elastic plate 12 is to prop up the sealing ring 9 and keep the sealing ring 9 away from the bulging area inside the annular groove 25, so as to prevent the sealing ring 9 from tilting toward the valve plate 4, thereby causing the convex ring 11 to preferentially squeeze the sealing ring 9 instead of the blocking portion 14 when approaching the annular groove 25. The elastic plate 12 makes the sealing ring 9 bulge toward the central part of the port of the steam inlet channel 2 or the steam outlet channel 3 close to the valve cavity, so as to prevent a part of the sealing ring 9 from bulging toward the valve plate 4 when the sealing ring 9 moves back to its original position following the blocking portion 14. Since the elastic plate 12 itself is elastic, when the end of the sealing ring 9 connected to the blocking portion 14 moves toward the inside of the annular groove 25, the area corresponding to the sealing ring 9 and the valve cavity wall will gradually approach the valve cavity wall of the valve body 1, and then the elastic plate 12 will be squeezed by the sealing ring 9 and will also tilt to one side, such as Figure 6 From the perspective of , the part of the elastic plate 12 that is not connected to the valve cavity will gradually approach the valve cavity. The elastic plate 12 can be made of elastic hard plastic material and can return to its original shape after deformation. When the valve plate 4 leaves, the sealing ring 9 relaxes its squeezing on the elastic plate 12, and the elastic plate 12 will prop up the sealing ring 9 again due to its own elasticity.

[0030] See also Figure 5 and Fig.11 , and also includes a support ring 20, which is fixedly installed on the side of the annular groove 25 away from the sliding groove 16, and the end of the sealing ring 9 that is not connected to the valve body 1 extends over the support ring 20 into the annular groove 25, and one side of the support ring 20 is set as an arc surface, and the outer wall of the sealing ring 9 is against the arc surface of the support ring 20.

[0031] The support ring 20 is also annular, and the outer wall of the support ring 20 is fixedly connected to the inner wall of the annular groove 25. Fig.10 From the perspective of Fig.11 From the perspective of , since one end of the sealing ring 9 needs to pass over the inner bottom wall of the annular groove 25 to be connected to the blocking portion 14, the outer wall of the sealing ring 9 will be against the outer wall of the support ring 20, and the arcuate surface of the support ring 20 is in contact with the sealing ring 9, and the arcuate surface of the support ring 20 is relatively smooth, so the friction between the outer wall of the sealing ring 9 can be reduced, and since the contact surface is smooth, the sealing ring 9 is not easily scratched when moving along the outer wall of the support ring 20.

[0032] See also Figure 5-Figure 12 The outer wall of the support ring 20 is fixedly connected with a water-absorbing pad 21, and the outer wall of the water-absorbing pad 21 is against the outer wall of the sealing ring 9. The support ring 20 and the valve body 1 are both provided with a plurality of through holes 27. The through holes 27 on the support ring 20 correspond to the through holes 27 on the valve body 1 and are connected to each other. The valve body 1 is provided with a plurality of first water guide grooves 22 and second water guide grooves 23. The first water guide grooves 22 and the second water guide grooves 23 are arranged at equal intervals along the circumferential direction of the annular groove 25. The first water guide grooves 22 and the second water guide grooves 23 are inclined and connected to each other. The first water guide groove 22 is connected to the plurality of through holes 27. The valve body 1 is provided with a plurality of water outlets 24, some of which are connected to the steam inlet channel 2, and the remaining water outlets 24 are connected to the steam outlet channel 3.

[0033] A layer of water-absorbing pad 21 is fixedly connected to the outer wall of the support ring 20. The water-absorbing pad 21 can be made of water-absorbing materials such as water-absorbing fibers or sponges, and is relatively soft. Since the side of the sealing ring 9 corresponding to the elastic plate 12 is not completely closed, steam molecules are likely to enter the side of the sealing ring 9 in contact with the elastic plate 12. Since the outer wall of the elastic plate 12 is against a part of the sealing ring 9, the water mist will be concentrated and adhered to the outer wall of the sealing ring 9 that is not in contact with the elastic plate 12. When this part of the sealing ring 9 moves, it will slide along the outer wall of the water-absorbing pad 21, absorbing water. The pad 21 will absorb water molecules on the outer wall of the sealing ring 9, and then as the sealing ring 9 squeezes the water-absorbing pad 21, the water can flow along the through hole 27 into the first water guide groove 22. Since the through hole 27 and the first water guide groove 22 are both in an inclined state, the water can easily flow from the through hole 27 to the first water guide groove 22, and then flow along the first water guide groove 22 to the second water guide groove 23. Since the second water guide groove 23 is also in an inclined state, the water will flow along the second water guide groove 23 to the water outlet 24, and finally flow back to the steam inlet channel 2 or the steam outlet channel 3 through the water outlet 24.

Claims

1. A double-valve-plate adjustable gate valve for use on a steam pipeline, comprising a valve body (1), wherein the valve body (1) has two transversely arranged steam inlet channels (2) and steam outlet channels (3) and a vertically arranged valve cavity, wherein the steam inlet channels (2) and the steam outlet channels (3) are respectively provided with valve plates (4) for opening or closing the valve cavity at their connection openings with the valve cavity, wherein the two valve plates (4) are arranged vertically in parallel, and wherein: Also includes, Two annular grooves (25) are respectively arranged along the steam inlet channel (2) and the steam outlet channel (3) at the connection openings with the valve chamber; A convex ring (11) has an outer diameter that is the same as the outer diameter of the valve plate (4) and is mounted on the opposite ends of the two valve plates (4) and is arranged to match the annular groove (25); A sealing ring (9), a fixed end of which is connected to the side wall of the valve cavity, and a movable end of which extends along the side wall of the valve cavity and is bent into the annular groove (25), wherein the length of the sealing ring (9) bent into the annular groove (25) is not less than the depth of the annular groove (25); The blocking portion (14) is sleeved on the annular groove (25), the movable end of the sealing ring (9) is connected to the blocking portion (14), a portion of the blocking portion (14) is protruding from the surface of the sealing ring (9), the spacing between the inner ring wall of the convex ring (11) and the inner ring of the annular groove (25) is not less than the thickness of the sealing ring (9), and is used for pushing the blocking portion (14) to drive the movable end of the sealing ring (9) to move when the convex ring (11) extends into the annular groove (25).

2. A double-valve plate adjustable gate valve for a steam pipeline as claimed in claim 1, characterized in that: It comprises a plurality of strip slideways (18) which are arranged at equal intervals on the inner bottom wall of the annular groove (25) along the circumferential direction of the annular groove (25), and a sliding group is arranged in the strip slideway (18); The sliding group comprises a plurality of balls (19) arranged at equal intervals along the axial direction of the strip slideway (18); an outlet is provided at one end of the strip slideway (18) away from the valve body (1); a diameter of the ball (19) is larger than the outlet of the strip slideway (18); a portion of the ball (19) extends through the outlet and is higher than the inner bottom wall of the annular groove (25); and an inner wall of the blocking portion (14) abuts against an outer wall of the ball (19).

3. A double-valve plate adjustable gate valve for a steam pipeline as claimed in claim 2, characterized in that: A reset member is provided in the annular groove (25), and the reset member comprises: A sliding groove (16) is arranged on one side of the annular clamping groove (25) and is in communication with the annular clamping groove (25). The sliding groove (16) corresponds horizontally to the blocking portion (14); A slider (13) has one end connected to a surface of the blocking portion (14) away from the sealing ring (9), and the other end extending into the interior of the sliding groove (16) and slidably connected to the inner wall of the sliding groove (16), and the inner walls of the slider (13) and the blocking portion (14) are both in contact with the outer wall of the ball (19); A plurality of elastic members (17) are arranged in the sliding groove (16) at equal intervals along the circumferential direction of the sliding groove (16); one end of the elastic member (17) is connected to the inner wall of the sliding groove (16), and the other end is connected to one end of the sliding block (13), so as to push the sliding block (13) and the blocking portion (14) back to their original positions when the sliding block (13) moves with the blocking portion (14) and presses the elastic member (17).

4. A double-valve plate adjustable gate valve for a steam pipeline as claimed in claim 3, characterized in that: The inner wall of the blocking portion (14) is provided with a plurality of buckling grooves (26), the number of the buckling grooves (26) being the same as the number of the strip slideways (18), the buckling grooves (26) being arranged at equal intervals along the circumferential direction of the blocking portion (14), each buckling groove (26) corresponding to one of the strip slideways (18), both sides of the buckling groove (26) protruding from the inner wall of the blocking portion (14) and extending into the interior of the strip slideway (18), the buckling groove (26) being adapted to the ball bearings (19), the inner wall of the buckling groove (26) being abutted against the outer wall of the ball bearings (19), and being used for the buckling groove (26) to slide along the plurality of ball bearings (19) in sequence when the blocking portion (14) moves.

5. A double-valve plate adjustable gate valve for a steam pipeline as claimed in claim 4, characterized in that: The valve body (1) further comprises a placement groove (15), which is formed in the valve cavity of the valve body (1) and is located between the annular clamping groove (25) and the buckle groove (26). The placement groove (15) is in communication with the annular clamping groove (25) and the sliding groove (16). The placement groove (15) corresponds horizontally to the blocking portion (14) and is adapted to the outer shape of the blocking portion (14).

6. A double-valve plate adjustable gate valve for a steam pipeline as claimed in claim 5, characterized in that: It also includes an elastic plate (12) which is obliquely arranged between the sealing ring (9) and the inner wall of the valve cavity, one end of the elastic plate (12) being connected to the inner wall of the valve cavity of the valve body (1), and the other end of the elastic plate (12) being inclined toward the center of the valve cavity and abutting against the outer wall of the sealing ring (9), thereby stretching the sealing ring (9) in a direction away from the valve plate (4).

7. A double-valve plate adjustable gate valve for a steam pipeline as claimed in claim 6, characterized in that: It also includes a support ring (20) mounted on a side of the annular groove (25) away from the sliding groove (16); an end of the sealing ring (9) not connected to the valve body (1) extends beyond the support ring (20) into the annular groove (25); one side of the support ring (20) is configured as an arcuate surface; an outer wall of the sealing ring (9) abuts against the arcuate surface of the support ring (20).

8. A double-valve plate adjustable gate valve for a steam pipeline as claimed in claim 7, characterized in that: The outer wall of the support ring (20) is connected to a water-absorbing pad (21), the outer wall of the water-absorbing pad (21) abuts against the outer wall of the sealing ring (9), the support ring (20) and the valve body (1) are both provided with a plurality of through holes (27), the through holes (27) on the support ring (20) correspond to the through holes (27) on the valve body (1) and are interconnected, the valve body (1) is provided with a plurality of first water guide grooves (22) and second water guide grooves (23), the first water guide grooves (2 2) and the second water guide groove (23) are arranged at equal intervals along the circumferential direction of the annular groove (25), the first water guide groove (22) and the second water guide groove (23) are arranged obliquely and communicate with each other, the first water guide groove (22) is communicated with a plurality of through holes (27), the valve body (1) is provided with a plurality of water outlets (24), some of the water outlets (24) are communicated with the steam inlet channel (2), and the remaining water outlets (24) are communicated with the steam outlet channel (3).

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