A new type of double-driven fully enclosed gas water-sealed gate valve

Abstract

The present invention relates to a novel dual-drive fully enclosed gas water-sealed plug-in valve, comprising a valve body, a valve cover and a valve plate, wherein the valve plate is movably arranged in a body cavity formed by the valve body and the valve cover; a valve plate opening and closing mechanism is arranged on the valve cover, and the valve plate opening and closing mechanism comprises a valve opening and closing driving device, an opening and closing rotating shaft and a rocker arm, the valve opening and closing driving device is connected to the opening and closing rotating shaft by a key, and the opening and closing rotating shaft is connected to the rocker arm by a key; a slider I is slidably arranged in an open groove at the other end of the rocker arm, and the slider I forms a movable hinge connection with a connecting plate pin column passing through the valve plate; both ends of the connecting plate pin column are hinged in the through holes of two sliders II, and the slider II slides in the groove arranged on the valve cover so that the connecting plate pin column drives the valve plate to make a linear motion in the body cavity. The novel dual-drive fully enclosed gas water-sealed plug-in valve of the present invention has a series of advantages such as small size, light weight, flexible installation method, fast opening and closing speed, safer and more reliable sealing, novel appearance and structure, etc. compared with a fully enclosed gas plug-in valve.

Description

Technical Field

[0001] The present invention relates to the technical field of gas water seal plug valve manufacturing, and specifically to a fully enclosed gas water seal plug valve with double drive and double valve plates, which is suitable for use as a cutoff device on pipelines containing tar gas and pure gas, and is widely used in metallurgy, coking and other industries. Background Art

[0002] The existing fully enclosed gas plug valve, also called the enclosed glasses valve, is composed of a valve body (composed of the left, middle and right parts), a valve plate (composed of a through-hole plate and a blind-hole plate), a valve plate travel mechanism, a valve expansion and clamping mechanism, and its working principle is as follows: the expansion and clamping mechanism arranged on the valve body compresses or stretches the bellows arranged in front of the valve body sealing seat to shrink or expand it, thereby realizing the separation or compression of the valve body sealing surface and the valve plate sealing surface.

[0003] The valve plate travel mechanism provided on the valve drives the valve plate to move left and right so that the through-hole plate and the blind-hole plate on the valve plate switch between the two sealing surfaces of the valve body. The valve can be cut off or conducted through the orderly action of the valve plate travel mechanism and the opening and clamping mechanism. The existing fully enclosed gas plug valve has a large structure size because the valve plate is composed of a through-hole plate and a blind-hole plate, and the through-hole plate and the blind-hole plate need to switch between the sealing surfaces of the valve body, and the valve can only be installed horizontally on a horizontal pipeline. Summary of the invention

[0004] The purpose of the present invention is to provide a more convenient and flexible installation method that is not restricted by site conditions, a safer and more reliable double sealing form of mechanical hard seal plus water seal, and a new type of dual-drive fully enclosed gas water seal gate valve that significantly improves the sealing effect and service life of the valve in order to address the problems of existing fully enclosed gas gate valves being large in size, single in installation method, large in space occupied at the installation site, and valve sealing elements being easily aged and failed, resulting in sealing leakage.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a novel dual-drive fully enclosed gas water-sealed plug valve, comprising a valve body, a valve cover, and a valve plate, wherein the valve plate is movably arranged in a body cavity formed by the valve body and the valve cover; a valve plate opening and closing mechanism is arranged on the valve cover, and the valve plate opening and closing mechanism comprises a valve opening and closing drive device, an opening and closing rotating shaft, and a rocker arm, the valve opening and closing drive device is connected to the opening and closing rotating shaft by a key, and the opening and closing rotating shaft is connected to the rocker arm by a key; a slider I is slidably arranged in an open groove at the other end of the rocker arm, and the slider I forms a movable hinge connection with a connecting plate pin column passing through the valve plate; both ends of the connecting plate pin column are hinged in the through holes of two sliders II, and the slider II slides in the groove arranged on the valve cover so that the connecting plate pin column drives the valve plate to make a linear motion in the body cavity, thereby driving the two valve plates to move up and down (vertical installation) or left and right (horizontal installation) in the body cavity.

[0006] The valve cover is provided with a groove to control the running track of the slider II when the valve is opened and closed.

[0007] Furthermore, the valve plate is provided with two pieces, and a valve plate tensioning mechanism is provided on the valve body, the valve plate tensioning mechanism comprises a valve plate tensioning drive device, a valve shaft, a tensioning shaft, a forward wedge block, and a reverse wedge block, the tensioning shaft, the forward wedge block, and the reverse wedge block are located between the two valve plates, and a connectable and separable one-shaped fork is used at the joint between the valve shaft and the tensioning shaft to transmit the power and angular displacement provided by the valve plate tensioning drive device; a left-handed external thread and a right-handed external thread are provided on the tensioning shaft, the left-handed external thread is matched and connected with the left-handed internal thread of the forward wedge block, and the right-handed external thread is matched and connected with the right-handed internal thread of the reverse wedge block.

[0008] The joint of the straight-line shift fork of the valve shaft is a boss, and the joint of the straight-line shift fork of the tensioning shaft is a groove, so the two can be conveniently joined and separated.

[0009] When the valve plate is in the closed position, the straight-shaped fork boss on the valve shaft is located in the straight-shaped fork groove set on the tensioning shaft, and as the valve plate tensioning drive device drives the valve shaft to rotate clockwise, the tensioning shaft is driven to rotate clockwise. The spiral transmission mechanism composed of the left-handed and right-handed external threads on the tensioning shaft and the left-handed and right-handed internal threads set in the forward wedge and reverse wedge makes the forward and reverse wedges move outward at the same time. The wedge force of the valve plate is applied to the sealing surface between the valve plate and the valve body to form a sealing force. The mechanical hard seal of the valve is formed by the spiral transmission plus the wedge-type force enhancement method.

[0010] When the valve plate is opened, the valve plate tensioning drive device drives the valve shaft to rotate counterclockwise, and the tensioning shaft is driven to rotate counterclockwise by the straight-line fork between the valve shaft and the tensioning shaft, and the forward and reverse wedges are moved inward at the same time by the spiral transmission mechanism, and the forward and reverse wedges are disengaged from the inclined surface of the valve plate, the wedging force between the wedges and the valve plate is removed, and the valve plate tensioning drive device stops when the opening direction of the straight-line fork groove of the tensioning shaft is rotated to a position consistent with the guide plate provided on the valve body or the valve cover.

[0011] Furthermore, a disc spring group is provided between the positive wedge block and the reverse wedge block.

[0012] When the sealing force between the valve sealing surfaces is removed, the positive wedge and the reverse wedge move inward at the same time, the butterfly spring group is compressed, and a spring preload force is provided between the spiral surfaces of the threaded transmission to prevent the threads from loosening and causing the groove at the joint of the tensioning shaft and the straight-fork to turn misaligned with the valve body guide plate, resulting in jamming and making it impossible for the valve plate to open and close.

[0013] Furthermore, a bellows is arranged between the forward wedge block and the reverse wedge block, a tensioning shaft sleeve is arranged at one end of the tensioning shaft passing through the reverse wedge block, and a tensioning shaft sealing sleeve, a tensioning shaft sealing ring and a tensioning shaft sealing pressure ring are arranged on the forward wedge block.

[0014] The closed space formed by the bellows between the forward and reverse wedge blocks, the tensioning shaft sleeve arranged on the reverse wedge block, the tensioning shaft sealing sleeve installed on the forward wedge block, the tensioning shaft sealing ring and the tensioning shaft sealing pressure ring enclose the spiral transmission mechanism composed of the tensioning shaft and the forward and reverse wedge blocks in a closed space, which is beneficial to protect the threaded transmission mechanism from being eroded by corrosive media in the pipeline and ensure flexible and reliable transmission.

[0015] Furthermore, the valve plate is configured in two pieces, and rollers and wheels are provided on opposite sides of the valve plate in the body cavity. The rollers are connected to the two valve plates, and rollers are provided on each valve plate. During the opening or closing process of the valve plate, the rollers roll on the double guide rails provided on the inner wall of the body cavity, and the rollers roll on the surface of the body cavity.

[0016] The relative position of the valve plates in the valve body cavity is ensured by a roller shaft arranged on the same side of the two valve plates and connected to the two valve plates and a roller arranged on the other side of the valve plates and connected to each valve plate.

[0017] Furthermore, an observation cover made of a high-strength explosion-proof transparent organic glass plate is fixed outside the groove of the valve cover.

[0018] An observation cover is provided to directly observe the position change of the slider II, thereby reflecting the opening and closing position of the valve plate.

[0019] Furthermore, a top cover is installed on the valve cover, and a water inlet and a vent are arranged on the top cover; a bottom cover is installed on the bottom of the valve, and a sewage outlet is arranged on the bottom cover.

[0020] The water inlet is used to inject water into the valve cavity to form a water seal to isolate the medium at both ends of the valve after a mechanical hard seal has been formed between the valve plate and the valve body. The vent is used to discharge the air in the body cavity when injecting water. The water stored between the valve body cavities for achieving the water seal and other dirt in the pipeline can be discharged through the sewage outlet.

[0021] Furthermore, a water level gauge or a pressure gauge is provided on the valve cover to provide water level information.

[0022] Furthermore, the valve body and the valve cover are horizontally distributed to form a horizontal installation structure, and support feet are provided at the bottom of the valve body and the bottom of the valve cover.

[0023] Furthermore, the valve body and the valve cover are vertically distributed to form a vertical installation structure, and a support foot is provided at the bottom of the valve body.

[0024] The technical effects of the present invention are as follows: since the new dual-drive fully enclosed gas water-sealed gate valve has only one pair of blind plates inside and corresponding structural measures are taken, the installation space of the valve is reduced and is not subject to the requirements of the surrounding pipelines on its installation space. It can be installed vertically or horizontally, overcoming the defects of the fully enclosed gas gate valve.

[0025] The valve sealing method of this invention adopts a double valve plate hard seal plus water seal structure, in which the double valve plate hard seal is realized by a valve plate tensioning mechanism, which adopts left-right thread transmission plus forward and reverse wedge block force enhancement method. At the same time, the left-right thread transmission components are enclosed in a sealed space to ensure that the threaded part is not corroded by corrosive media in the pipeline, ensuring that its operation is flexible and reliable.

[0026] The two valve plates of the invention can realize mechanical hard sealing through the valve plate tensioning mechanism, and then water can be injected into the middle cavity of the valve through the water injection port arranged on the valve cover to produce a water seal between the two sealing surfaces of the valve, so that the valve sealing structure is a double sealing form of mechanical hard seal and water seal, which overcomes the phenomenon of internal and external leakage of the valve caused by aging and failure of the rubber sealing ring of the fully enclosed gas plug valve due to use time or medium corrosion, making the valve seal safer and more reliable.

[0027] The new double-driven fully enclosed gas water seal plug valve is composed of support feet, bottom cover, valve body, valve plate, valve plate tensioning mechanism, water level gauge or pressure gauge, top cover, valve opening and closing mechanism, valve cover, observation cover, side cover, roller shaft, roller, roller shaft, spring, etc. The valve opening and closing mechanism is composed of valve opening and closing drive device, opening and closing shaft, rocker arm, slider I, slider II, connecting plate pin. The valve plate tensioning mechanism is composed of valve plate tensioning drive device, valve shaft sealing pressure ring, valve shaft sealing ring, valve shaft, tensioning shaft, tensioning shaft sealing pressure ring, tensioning shaft sealing ring, tensioning shaft sealing sleeve, forward wedge, reverse wedge, tensioning shaft sleeve, disc spring group, bellows.

[0028] The mechanical hard seal of the new double-driven fully enclosed gas water-sealed plug valve is formed by the left-right trapezoidal thread and a group of forward and reverse wedges set on the tensioning shaft. A butterfly spring is installed between the forward and reverse wedges to ensure that the two wedges can increase the pre-tightening force between the spiral pairs in the retracted state to prevent the threads from loosening. The spiral transmission components move in the closed space formed by the tensioning shaft sealing ring, the tensioning shaft sealing ring, the tensioning shaft sealing sleeve, the bellows set between the forward wedge and the reverse wedge, and the tensioning shaft sleeve, which can effectively prevent the corrosive media from corroding the spiral transmission parts and ensure its flexible and reliable operation.

[0029] The opening or closing action of the valve plate is realized by a rocker slider mechanism composed of a rotating shaft, a rocker arm, a slider I, a slider II and a connecting plate pin, wherein the slider II slides in a groove set on the valve cover, and an observation cover made of a thickened explosion-proof transparent organic glass plate is fixed outside the groove. The slider position can be visually displayed through the observation cover to indicate the opening and closing position of the gate. Rollers and rollers are respectively set on both sides of the valve plate. The rollers are installed on one side of the two valve plates and connect the two valve plates, and are in rolling contact with the valve body or valve cover guide rail. The rollers are set outside the roller shaft and installed on the other side of each valve plate to contact the inner surface of the valve body or valve cover. The rollers and rollers ensure that the valve plate can move normally when the valve is installed vertically or horizontally.

[0030] The new double-driven fully enclosed gas water seal plug valve has a water injection port and a discharge port at the top, and a water level gauge or pressure gauge is set to provide water level information. A sewage box and a sewage outlet are set at the bottom of the valve.

[0031] When the valve is closed, the valve opening and closing drive device drives the opening and closing shaft to rotate clockwise to drive the rocker arm to move, and the slider II moves downward (when installed vertically) or leftward (when installed horizontally) in the groove of the valve cover, driving the valve plate to move to the closed position. When the valve plate is in the closed position, the valve plate tensioning drive device drives the valve shaft to rotate clockwise, and the straight-shaped fork at the connection between the valve shaft and the tensioning shaft drives the tensioning shaft to rotate clockwise. The left-right threaded transmission mechanism between the tensioning shaft and the forward and reverse wedges transmits power to move the forward and reverse wedges away from the center of the valve, and then the wedge converts and amplifies the axial force on the valve shaft into a sealing force on the valve sealing surface. After the valve is subjected to the above-mentioned mechanical sealing force, water is injected into the inner cavity of the valve through the water injection port to stop injecting water when the specified water level or the specified water pressure is reached. The water pressure in the inner cavity of the valve forms a water seal on the two sealing surfaces to ensure the sealing performance of the valve. The water level meter or pressure gauge monitors the water level or water pressure in the inner cavity. When the water level or water pressure is lower than the lower limit, water is injected through the water injection port to increase pressure.

[0032] When the valve is opened, the water in the valve cavity is first discharged through the drain port, and then the valve plate tensioning drive device rotates the valve shaft counterclockwise, and the straight-shaped fork between the valve shaft and the tensioning shaft drives the tensioning shaft to rotate counterclockwise until the tensioning shaft groove is consistent with the position of the guide plate set on the valve body and stops rotating. At this time, the left-right threaded transmission mechanism between the tensioning shaft and the positive and negative wedge blocks moves the positive and negative wedge blocks toward the center of the valve plate, and the inclined surface of the original wedge block in contact with the valve plate is disengaged, the sealing force between the valve plate and the sealing surface of the valve body is cancelled, and only the spring preload force between the two valve plates is retained. The valve opening and closing drive device rotates the rocker arm counterclockwise to drive the slider and the valve plate to move in the direction of valve opening, and the valve completes the opening action.

[0033] Compared with the conventional fully enclosed gas gate valve, the novel dual-drive fully enclosed gas water-sealed gate valve of the present invention has the following main features:

[0034] 1. Novel appearance and flexible installation method

[0035] Compared with the fully enclosed gas plug valve, the valve has the following notable features: the valve is small in size and has a flexible installation method. It can be installed vertically or horizontally. There are water inlets and vents at the top of the valve, and a sewage outlet at the bottom of the valve. A water level gauge or pressure gauge is provided on the upper part of the valve to monitor the water level or water pressure of the water seal in the body cavity. A groove is provided on the valve cover to control the running track of the slider II when the valve is opened and closed. An observation cover made of a high-strength explosion-proof transparent organic glass plate is fixed outside the groove, which can directly observe the position change of the slider and reflect the opening and closing position of the valve plate.

[0036] 2. The seal is safer and more reliable

[0037] Compared with the fully enclosed gas gate valve, the soft rubber sealing ring is easy to age and its service life is greatly shortened. The new double-driven fully enclosed gas water-sealed gate valve adopts a double sealing form of mechanical hard seal and water seal, and a water level gauge or pressure gauge is added to monitor the water level. Its sealing performance is safer and more reliable.

[0038] 3. Different transmission methods

[0039] The present invention adopts two sets of driving devices to control the opening and closing action of the valve and the tightening action of the valve plate respectively. The opening and closing action of the valve is controlled by the valve opening and closing driving device to control the opening and closing rotating shaft, rocker arm, slider I, slider II, connecting plate pin and other parts to form a rocker arm slider mechanism to realize the opening and closing of the valve plate. The tightening action of the valve plate is controlled by the valve plate tightening driving device to control the valve shaft, tightening shaft, forward and reverse wedge blocks and the threaded transmission plus wedge force amplification mechanism formed by them to control the compression and separation of the valve plate sealing surface to the valve body sealing surface, thereby completing the tightening action of the valve plate.

[0040] Compared with the fully enclosed gas flapper valve, the novel dual-drive fully enclosed gas water-sealed flapper valve of the present invention has the following beneficial effects:

[0041] (1) The volume and weight are significantly reduced, and the original three-box structure is changed to a two-box structure. In particular, the valve installation method of the present invention can be vertical or horizontal, and the space requirement on the site of use is not limited.

[0042] (2) Since the valve is opened and closed using a rocker arm slider mechanism, the opening and closing speed is faster than the gear rack or sprocket chain transmission method of the fully enclosed gas gate valve.

[0043] (3) The valve seal adopts a double seal form of mechanical hard seal and water seal, which has better sealing performance.

[0044] (4) The valve adopts a double-plate structure with two valve plates. Four compression springs are arranged between the two valve plates to create a pre-tightening force between the valve plates and the sealing surface of the valve body. The sealing surface can be scraped during the opening and closing process to reduce the influence of tar or other impurities in the gas medium on the sealing performance.

[0045] (5) An enlarged sewage box is provided at the bottom of the valve body or valve cover, which can effectively store the dirt scraped from between the valve sealing pairs.

[0046] The novel dual-drive fully enclosed gas water-sealed gate valve of the present invention has a series of advantages over the fully enclosed gas gate valve, such as small size, light weight, flexible installation, fast opening and closing speed, safer and more reliable sealing, novel appearance and structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] AttachedFigure 1 This is the horizontal installation appearance drawing of the new double-driven fully enclosed gas water-seal plug valve;

[0048] Attached Figure 2 This is the vertical installation appearance drawing of the new double-driven fully enclosed gas water-seal plug-in valve;

[0049] Attached Figure 3 It is a schematic diagram of the opening and closing mechanism structure of a new type of double-driven fully enclosed gas water-sealed plug valve;

[0050] Attached Figure 4 It is a structural diagram of the valve plate tensioning mechanism of a new type of double-driven fully enclosed gas water-sealed plug valve;

[0051] Attached Figure 5 This is an enlarged schematic diagram of the valve plate tensioning mechanism A of the new double-driven fully enclosed gas water-seal plug valve;

[0052] Attached Figure 6 This is an enlarged schematic diagram of the valve plate tensioning mechanism B of the new dual-drive fully enclosed gas water-seal plug-in valve.

[0053] 1. Valve plate tensioning drive device; 2. Water level gauge or pressure gauge; 3. Top cover; 4. Valve plate tensioning drive device; 5. Valve plate tensioning drive device; 6. Water level gauge or pressure gauge; 7. Top cover; 8. Valve opening and closing drive device; 9. Valve cover; 10. Observation cover; 11. Side cover; 12. Opening and closing shaft; 13. Rocker arm; 14. Slider I; 15. Slider II; 16. Connecting plate pin; 17. Roller shaft; 18. Roller; 19. Roller shaft; 20. Spring; 21. Valve shaft sealing pressure ring; 22. Valve shaft sealing ring; 23. Valve shaft; 24. Tensioning shaft; 25. Tensioning shaft sealing pressure ring; 26. Tensioning shaft sealing ring; 27. Tensioning shaft sealing sleeve; 28. Forward wedge block; 29. ​​Reverse wedge block; 30. Tensioning shaft sleeve; 31. Disc spring assembly; 32. Bellows. DETAILED DESCRIPTION

[0054] 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.

[0055] Example

[0056] As attached Figure 1 , 2 The new double-driven fully enclosed gas water-sealed plug valve shown in the figure is composed of a support foot 1, a bottom cover 2, a valve body 3, a valve plate 4, a water level gauge or a pressure gauge 6, a top cover 7, a valve cover 9, an observation cover 10, a side cover 11, a roller shaft 17, a roller 18, a roller shaft 19, a spring 20, and a valve opening and closing mechanism (attached Figure 3 )、Valve plate tensioning mechanism (attached Figure 4 , 5 , 6) composition.

[0057] A top cover 7 is installed on the valve cover 9, and a water inlet and a vent are provided on the top cover 7. The water inlet is used to inject water into the valve cavity after a mechanical hard seal has been formed between the valve plate 4 and the valve body 3 to form a water seal to isolate the medium at both ends of the valve, and the vent is used to discharge the air in the body cavity when injecting water.

[0058] The valve body 3 (when installed vertically) or the valve cover 9 (when installed horizontally) is provided with a sewage box and a bottom cover 2 is installed. The bottom cover 2 is provided with a sewage outlet, through which the water stored between the valve body cavities for achieving the water seal and other dirt in the pipeline can be discharged.

[0059] As attached Figure 1 , 2 As shown, a groove is provided on the valve cover 9 to control the running track of the slider II 15 when the valve is opened and closed. An observation cover 10 made of a high-strength explosion-proof transparent organic glass plate is fixed outside the groove, and the position change of the slider II 15 can be directly observed to reflect the opening and closing position of the valve plate 4.

[0060] As attached Figure 1 , 2 As shown, a water level gauge or pressure gauge 6 is provided on the valve cover 9, which is used to detect the water level or water pressure of the water seal in the valve body cavity when the valve is closed. When the water level or water pressure of the water seal is lower than the set minimum value, water will be injected into the valve body cavity through the water inlet provided on the top cover 7 until the water level or water pressure of the water seal reaches the set value, so as to ensure the safe operation of the valve.

[0061] As attached Figure 3 As shown, the valve opening and closing mechanism consists of a valve opening and closing drive device 8 fixed on the valve cover 9, an opening and closing shaft 12, a rocker arm 13, a slider I 14, a slider II 15 and a connecting plate pin 16 arranged between the two valve plates and connected to the sliders I and II to form a movable hinge. The mechanism provides sufficient opening force or closing force to the two valve plates to realize the movement of the valve plates in the valve cavity, so that the valve plates are in an open or closed position.

[0062] The valve opening and closing drive device 8 and the opening and closing shaft 12, as well as the opening and closing shaft 12 and the rocker arm 13 are connected by keys. The slider I14 slides in the open groove set on the rocker arm 13. The slider I14 forms a movable hinge connection with the connecting plate pin 16 that passes through the through holes set on the two valve plates 4. The two ends of the connecting plate pin 16 are hinged in the through holes of the two sliders II15. The slider II15 slides in the groove set on the valve cover 9 to make the connecting plate pin 16 move linearly, thereby driving the two valve plates 4 to move up and down (vertical installation) or left and right (horizontal installation) in the body cavity.

[0063] The relative position of the valve plates 4 in the valve body cavity is ensured by a roller 17 arranged on the same side of the two valve plates 4 and connecting the two valve plates 4, and a roller 18 arranged on the other side of the valve plates 4 and connected to each valve plate 4. During the opening or closing process of the valve plates 4, the roller 17 rolls on the double guide rails arranged in the valve body 3 or the valve cover 9, and the roller 18 rolls on the inner cavity surface of the valve body 3 or the valve cover 9.

[0064] As attached Figure 4 , 5 As shown in Figures 6 and 7, the valve plate tensioning mechanism is composed of a valve plate tensioning driving device 5 arranged on the valve body 3, a valve shaft sealing pressure ring 21, a valve shaft sealing ring 22, a valve shaft 23, and a tensioning shaft 24 arranged between two valve plates 4 and movable with the valve plates 4, a tensioning shaft sealing pressure ring 25, a tensioning shaft sealing ring 26, a tensioning shaft sealing sleeve 27, a positive wedge 28, a reverse wedge 29, a tensioning shaft sleeve 30, a disc spring group 31, and a bellows 32. The mechanism is used to provide sufficient sealing force between the gate sealing surface and the valve body sealing surface to realize the mechanical hard sealing of the valve, and provide a basic guarantee for the realization of the valve water seal function.

[0065] The valve shaft 23 and the valve plate tensioning drive device 5 are connected by a key, and the straight-shaped fork used at the junction of the valve shaft 23 and the tensioning shaft 24 transmits the torque provided by the valve plate tensioning drive device 5. When the valve plate 4 is in the closed position, the straight-shaped fork boss on the valve shaft 23 is located in the straight-shaped fork groove provided on the tensioning shaft 24, and as the valve plate tensioning drive device 5 drives the valve shaft 23 to rotate clockwise, the tensioning shaft 24 is driven to rotate clockwise, and the forward and reverse wedges are simultaneously moved outwards through the spiral transmission mechanism composed of the left-handed and right-handed external threads on the tensioning shaft 24 and the left-handed and right-handed internal threads provided in the forward wedge block 28 and the reverse wedge block 29, and the valve plate 4 is subjected to the wedging force of the wedge block to form a sealing force through the sealing surface between the valve plate 4 and the valve body 3.

[0066] As attached Figure 4 , 5As shown in Figures 6 and 7, when the valve plate 4 is opened, the valve plate tensioning driving device 5 drives the valve shaft 23 to rotate counterclockwise, and the tensioning shaft 24 is driven to rotate counterclockwise by the straight-shaped fork between the valve shaft 23 and the tensioning shaft 24, and the forward and reverse wedges are moved inward at the same time by the spiral transmission mechanism, and the forward wedge 28 and the reverse wedge 29 are out of contact with the inclined surface of the valve plate, and the wedging force between the wedge and the valve plate 4 is removed, and the opening direction of the straight-shaped fork groove of the tensioning shaft 24 is just rotated to the guide provided on the valve body 3 or the valve cover 9. When the valve plates are in the same position, the valve plate tensioning drive device 5 stops moving, and the elastic force provided by the disc spring group 31 between the positive wedge block 28 and the reverse wedge block 29 will make the left and right thread positions on the tensioning shaft 24 self-locking. As the valve plate 4 moves along the guide rail in the valve body 3, the straight-line fork groove on the tensioning shaft 24 will slide into the guide plate, and the tensioning shaft 4 is locked by the guide plate and will not rotate until the valve plate 4 is in the closed position again. The tensioning shaft 24 groove can be released only after it slides into the straight-line fork boss of the valve shaft 23.

[0067] The closed space formed by the bellows 32 between the forward and reverse wedge blocks, the tensioning shaft sleeve 30 arranged on the reverse wedge block, the tensioning shaft sealing sleeve 27 installed on the forward wedge block, the tensioning shaft sealing ring 26, and the tensioning shaft sealing pressure ring 25 encloses the spiral transmission mechanism in a closed space, which is beneficial to protect the threaded transmission mechanism from being eroded by corrosive media in the pipeline and ensure flexible and reliable transmission.

[0068] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. A new type of double-driven fully enclosed gas water seal gate valve, characterized in that: It includes a valve body, a valve cover, and a valve plate, and the valve plate is movably arranged in the body cavity formed by the valve body and the valve cover; a valve plate opening and closing mechanism is arranged on the valve cover, and the valve plate opening and closing mechanism includes a valve opening and closing drive device, an opening and closing rotating shaft, and a rocker arm, and the valve opening and closing drive device is connected to the opening and closing rotating shaft through a key, and the opening and closing rotating shaft is connected to the rocker arm through a key; a slider I is slidably arranged in the opening groove at the other end of the rocker arm, and the slider I forms a movable hinge connection with the connecting plate pin column passing through the valve plate; the two ends of the connecting plate pin column are hinged in the through holes of the two sliders II, and the slider II slides in the groove arranged on the valve cover so that the connecting plate pin column drives the valve plate to make a linear motion in the body cavity; The valve plate is provided with two pieces, and a valve plate tensioning mechanism is provided on the valve body. The valve plate tensioning mechanism includes a valve plate tensioning driving device, a valve shaft, a tensioning shaft, a forward wedge block, and a reverse wedge block. The tensioning shaft, the forward wedge block, and the reverse wedge block are located between the two valve plates. The joint part of the valve shaft and the tensioning shaft adopts a straight-shaped fork that can be combined and separated to transmit the power and angular displacement provided by the valve plate tensioning driving device; a left-handed external thread and a right-handed external thread are provided on the tensioning shaft. The left-handed external thread is matched and connected with the left-handed internal thread of the forward wedge block, and the right-handed external thread is matched and connected with the right-handed internal thread of the reverse wedge block; An observation cover made of a high-strength explosion-proof transparent organic glass plate is fixed outside the groove of the valve cover.

2. A novel dual-drive fully enclosed gas water-seal gate valve according to claim 1, characterized in that: A disc spring group is arranged between the positive wedge block and the reverse wedge block.

3. A novel dual-drive fully enclosed gas water-seal gate valve according to claim 1 or 2, characterized in that: A bellows is arranged between the forward wedge block and the reverse wedge block, a tensioning shaft sleeve is arranged at one end of the tensioning shaft passing through the reverse wedge block, and a tensioning shaft sealing sleeve, a tensioning shaft sealing ring and a tensioning shaft sealing pressure ring are arranged on the forward wedge block.

4. A novel dual-drive fully enclosed gas water-seal gate valve according to claim 1, characterized in that: The valve plate is provided with two pieces, and rollers and wheels are provided on opposite sides of the valve plate in the body cavity. The rollers are connected to the two valve plates, and rollers are provided on each valve plate. During the opening or closing process of the valve plate, the rollers roll on the double guide rails provided on the inner wall of the body cavity, and the rollers roll on the surface of the body cavity.

5. A novel dual-drive fully enclosed gas water-seal gate valve according to claim 1, characterized in that: A top cover is installed on the valve cover, and a water inlet and a vent are arranged on the top cover. A bottom cover is installed on the bottom of the valve, and a sewage outlet is arranged on the bottom cover.

6. A novel dual-drive fully enclosed gas water-seal gate valve according to claim 5, characterized in that: A water level gauge or pressure gauge is provided on the valve cover.

7. A novel dual-drive fully enclosed gas water-seal gate valve according to claim 1, characterized in that: The valve body and the valve cover are horizontally distributed to form a horizontal installation structure, and support feet are arranged at the bottom of the valve body and the bottom of the valve cover.

8. A novel dual-drive fully enclosed gas water-sealed gate valve according to claim 1, characterized in that: The valve body and the valve cover are vertically distributed to form a vertical installation structure, and a support foot is arranged at the bottom of the valve body.

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