A flat gate valve with top seal and zero leakage

Abstract

The present invention discloses a flat gate valve with zero leakage of upper sealing, which belongs to the technical field of flat gate valves. It comprises a valve body, a valve cover is installed with a valve bolt on the top of the valve body, a shaft sleeve is fixedly sleeved on the outer surface of the valve cover, one end of the valve body is fixedly connected to a water inlet pipe, the other end of the valve body is fixedly connected to a water outlet pipe, and an accommodating cavity is provided inside the valve body; the flat gate valve with zero leakage of upper sealing prevents the valve body and the flat gate plate from being subjected to a large medium impact force during the closing process of the valve body by arranging a driving mechanism and a diversion mechanism, thereby improving the service life of the valve body and the flat gate plate, and achieving the upper sealing effect through the upper sealing mechanism, thereby solving the problem of the existing flat gate valve that the valve body is subjected to a large medium impact force during the closing process, reducing the service life of the flat gate plate and the valve body, and requiring a large amount of filler to be compressed at the sealing filler, which may cause medium leakage after the valve is used for a long time.

Description

Technical Field

[0001] The present invention relates to the field of flat gate valves, and more particularly to a flat gate valve with an upper seal and zero leakage. Background Art

[0002] The flat gate valve is a sliding valve with a parallel gate as the closing part. The flat gate valve can be divided into manual flat gate valve, pneumatic flat gate valve and electric flat gate valve according to the driving mode. It can be divided into flat gate valve with diversion hole, flat gate valve without diversion hole, oilfield flat gate valve, pipeline flat gate valve and gas flat gate valve according to the purpose and occasion.

[0003] In the process of opening and closing the existing flat gate valve, the gate plate usually moves directly upward or downward to cooperate with the gate valve to complete the opening and closing of the gate valve, and a large amount of sealing packing is often required at the sealing packing to fill the gap between the valve stem and the valve body to prevent medium leakage.

[0004] However, the existing flat gate valve is not convenient for controlling the flow rate of the medium in the valve body during the opening or closing process, resulting in the valve body being subjected to a large impact force of the medium during the closing process, thereby reducing the service life of the flat gate and the valve body.

[0005] The existing flat gate valve sealing packing requires a large amount of packing to be compressed, and a large amount of compression is required to achieve the sealing effect. After the valve is used for a long time, a gap is likely to appear between the valve stem and the packing, resulting in medium leakage. Summary of the Invention

[0006] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a flat gate valve with zero leakage on the upper seal, which can overcome the problem that the medium impact force of the existing valve body is large during the closing process, thereby reducing the service life of the flat gate and valve body.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] The present invention provides a flat gate valve with upper sealing and zero leakage, comprising a valve body, a valve cover is installed with a bolt on the top of the valve body, a shaft sleeve is fixedly sleeved on the outer surface of the valve cover, one end of the valve body is fixedly connected to a water inlet pipe, and the other end of the valve body is fixedly connected to a water outlet pipe, an accommodating cavity is opened in the interior of the valve body, one end of the water inlet pipe and the water outlet pipe extend into the interior of the valve body and are connected to two valve seats, a flat gate plate is arranged between the two valve seats, a valve stem is fixedly connected to the top of the flat gate plate, an upper sealing mechanism is arranged on the flat gate plate, a driving mechanism is arranged on the top of the shaft sleeve, a flow guide mechanism is arranged in the water inlet pipe, and a fixing mechanism is arranged on the top of the flow guide mechanism;

[0009] The upper sealing mechanism includes a connecting arm extending into the interior of the accommodating cavity, the outer surface of the connecting arm is fixedly connected to a sealing portion, the sealing portion abuts against the inner surface of the accommodating cavity, the outer surface of the sealing portion is provided with two first sealing grooves, and two first O-type wear-resistant sealing rings are installed in the two first sealing grooves;

[0010] The guide mechanism includes a guide plate, which is rotatably connected to the water inlet pipe. A placement slot is provided on the top of the guide plate, and a fixed rod is fixedly connected to the placement slot. A movable block is movably sleeved on the outer surface of the fixed rod, and a sealing sleeve is fixedly connected to the outer surface of the water inlet pipe. A movable rod is movably inserted into the sealing sleeve, and the bottom end of the movable rod movably penetrates the water inlet pipe and is hinged to the movable block through a hinge seat. By setting a driving mechanism and a guide mechanism, under the cooperation of a linkage mechanism, the flat gate plate can be controlled to open and close while the guide plate can be synchronously driven to rotate in the water inlet pipe. Under the joint cooperation of the placement slot, the fixed rod, the movable block, the movable rod and the sealing sleeve, the guide plate swings when the flat gate plate is closed. The tilt changes the flow rate of the medium in the valve body, preventing the valve body and the flat gate from being subjected to a large medium impact force. When the flat gate is opened, the guide plate swings to a horizontal state, which can reduce the obstruction of the medium in the valve body and improve the service life of the valve body and the flat gate. By setting up an upper sealing mechanism, the form of the conventional gate is changed, and a sealing structure combining a connecting arm, a sealing part, a first sealing groove and a first O-type wear-resistant sealing ring is designed to achieve an upper sealing effect without the need for packing compression, which solves the problem of the existing flat gate valve being subjected to a large medium impact force during the closing process, reducing the service life of the flat gate and the valve body, and a large amount of packing is required to compress the sealing packing, which will cause medium leakage after long-term use of the valve.

[0011] In a preferred technical solution of the present invention, the driving mechanism includes a fixed shell, which is fixedly connected to the top of the sleeve, and the top end of the valve stem movably passes through the valve cover and the sleeve and extends into the fixed shell. A screw is rotatably connected inside the fixed shell, and a moving block is threadedly connected to the outer surface of the screw. A limiting groove is provided on one side of the fixed shell, and a limiting plate is slidably connected in the limiting groove, and one side of the limiting plate is fixedly connected to the moving block.

[0012] In a preferred technical solution of the present invention, one side of the moving block is movably connected to two connecting hole plates, and the two connecting hole plates are rotatably connected to the fixed shell at one end away from the moving block. Two swing guide grooves are provided at the connection parts of the two connecting hole plates and the moving block, and two lifting guide grooves are provided on one side of the two connecting hole plates. The two connecting hole plates are movably connected to a connecting slider through the two lifting guide grooves, and a limit baffle fixedly connected in the fixed shell, the connecting slider is slidably connected to the limit baffle, and the bottom end of the connecting slider is fixedly connected to the valve stem.

[0013] In a preferred technical solution of the present invention, the bottom of the limit plate is fixedly connected with a telescopic rod, the bottom end of the telescopic rod is fixedly connected with a connecting rod, the outer surface of the screw is fixedly sleeved with a worm gear, the inner side of the fixed shell is connected with a worm gear through a bearing, and the worm gear is meshed with the worm gear; by setting a driving mechanism, the transmission mode of the worm gear and the worm gear has self-locking properties, which can ensure the stability of the flat gate plate and the guide plate, and a moving block and a connecting slider are set. The rotation of the screw drives the moving block to move up and down, and the moving block drives the connecting orifice plate to swing through the swing guide groove, so that the swing of the connecting orifice plate drives the connecting slider to slide along one side of the limit baffle through the lifting guide groove, and the sliding of the connecting slider drives the valve stem and the flat gate plate to move, and at the same time, with the cooperation of the telescopic rod and the connecting rod, the purpose of the lifting and lowering movement of the flat gate plate and the swinging movement of the guide plate is synchronously achieved.

[0014] In a preferred technical solution of the present invention, a rotating wheel is fixedly mounted on one end of the worm, a support plate is fixedly connected to the inner top of the fixed shell, and one end of the worm is rotatably connected to the support plate.

[0015] In a preferred technical solution of the present invention, the fixing mechanism includes a fixing block, which is fixedly connected to the top end of the movable rod, a slot is provided at the top end of the fixing block, a fixing hole is provided on the outer surface of the connecting rod, the outer surface of the fixing block is fixedly connected to a fixing frame, a slide is slidably connected to the inner side of the fixing frame, one side of the slide is fixedly connected to a limiting rod, and one end of the limiting rod movably passes through the fixing block and the slot and extends into the fixing hole.

[0016] In a preferred technical solution of the present invention, a pull rod is fixedly connected to one side of the slide, one end of the pull rod movably passes through the fixing frame and is fixedly connected to a pull ring, and a reset spring is sleeved on the outer surface of the pull rod.

[0017] In a preferred technical solution of the present invention, two second sealing grooves are opened on the inner surface of the valve cover, and two second O-type wear-resistant sealing rings are installed in the two second sealing grooves. A third sealing groove is opened on the top of the valve body, and a mid-way wound gasket is arranged in the third sealing groove.

[0018] In a preferred technical solution of the present invention, a balancing hole communicating with the accommodating cavity is provided on the outer surface of the valve cover, and a screw plug is threadedly connected to the inner surface of the balancing hole.

[0019] In a preferred technical solution of the present invention, a mounting groove is provided on the top of the valve cover, the mounting groove is filled with graphite, and the bottom of the sleeve extends into the mounting groove and is pressed tightly with the graphite in the mounting groove; through the fixing mechanism, with the cooperation of the limit rod and the fixing hole, the connecting rod can be easily fixed to ensure that the guide plate will not be accidentally displaced during operation, thereby ensuring the effective performance of the diversion function. When the flat gate valve needs maintenance and inspection, the setting of the pull rod, pull ring and reset spring facilitates the quick disassembly and assembly of the connecting rod and the fixing block, thereby facilitating maintenance and inspection.

[0020] The beneficial effects of the present invention are:

[0021] The closure of the closure is closed by the cam, and the closure is closed by the cam, so that the closure is closed and the closure is closed, thereby preventing the closure from leaking out of the closure and the closure is closed.

[0022] By setting up a driving mechanism, the transmission mode of the worm gear and the worm is self-locking, which can ensure the stability of the flat gate and the guide plate. A moving block and a connecting slider are set. The rotation of the screw drives the moving block to move up and down, and the moving block drives the connecting orifice plate to swing through the swing guide groove, so that the swing of the connecting orifice plate drives the connecting slider to slide along one side of the limit baffle through the lifting guide groove. The sliding of the connecting slider drives the valve stem and the flat gate to move. At the same time, with the cooperation of the telescopic rod and the connecting rod, the purpose of the lifting movement of the flat gate and the swing movement of the guide plate is achieved synchronously.

[0023] Through the fixing mechanism, with the cooperation of the limit rod and the fixing hole, the connecting rod can be easily fixed to ensure that the guide plate will not be accidentally shifted during operation, thereby ensuring the effective performance of the diversion function. When the flat gate valve needs maintenance and inspection, the setting of the pull rod, pull ring and reset spring facilitates the quick disassembly and assembly of the connecting rod and the fixing block, which facilitates maintenance and inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional diagram of the main structure of a flat gate valve with upper sealing and zero leakage according to the present invention;

[0025] Figure 2 This is a right-side structural perspective view of a flat gate valve with top sealing and zero leakage according to the present invention;

[0026] Figure 3 This is a frontal sectional structural perspective view of a flat gate valve with an upper seal and zero leakage according to the present invention;

[0027] Figure 4 This is a partially expanded structural perspective view of a connecting rod and a fixed block in a flat gate valve with top sealing and zero leakage according to the present invention;

[0028] Figure 5 This is a partial cross-sectional structural perspective view of a water inlet pipe in a flat gate valve with top sealing and zero leakage according to the present invention;

[0029] Figure 6 This is a partial cross-sectional structural perspective view of a fixed shell in a flat gate valve with top sealing and zero leakage according to the present invention;

[0030] Figure 7 This is a perspective view of the expanded structure of the balancing hole and the screw plug in a flat gate valve with top sealing and zero leakage according to the present invention;

[0031] Figure 8 for Figure 3 The enlarged structural stereogram at B in the middle;

[0032] Figure 9 for Figure 3 Enlarged three-dimensional diagram of the structure at point A in the middle.

[0033] In the picture:

[0034] 1. Valve body; 2. Valve cover; 3. Bushing; 4. Water inlet pipe; 5. Water outlet pipe; 6. Accommodating chamber; 7. Valve seat; 8. Flat gate; 9. Valve stem; 10. Upper sealing mechanism; 1001. Connecting arm; 1002. Sealing part; 1003. First sealing groove; 1004. First O-type wear-resistant sealing ring; 11. Driving mechanism; 1101. Fixed shell; 1102. Screw; 1103. Moving block; 1104. Limiting groove; 1105. Limiting plate; 1106. Connecting orifice plate; 1107. Swinging guide groove; 1108. Lifting guide groove; 1109. Connecting slider; 1110. Limiting baffle; 1111. Telescopic rod; 1112. Connecting rod; 1113. Worm gear; 1 114. Worm; 1115. Rotor; 1116. Support plate; 12. Guide mechanism; 1201. Guide plate; 1202. Placement slot; 1203. Fixed rod; 1204. Movable block; 1205. Sealing sleeve; 1206. Movable rod; 13. Fixing mechanism; 1301. Fixed block; 1302. Slot; 1303. Fixing hole; 1304. Fixing frame; 1305. Slide plate; 1306. Limiting rod; 1307. Pull rod; 1308. Pull ring; 1309. Return spring; 14. Second sealing groove; 15. Second O-ring; 16. Third sealing groove; 17. Middle spiral wound gasket; 18. Balancing hole; 19. Screw plug; 20. Mounting groove. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] like Figures 1-9 As shown, an embodiment provides a flat gate valve with an upper seal and zero leakage, comprising a valve body 1, a valve cover 2 being installed on the top bolt of the valve body 1, a shaft sleeve 3 being fixedly sleeved on the outer surface of the valve cover 2, one end of the valve body 1 being fixedly connected to a water inlet pipe 4, and the other end of the valve body 1 being fixedly connected to a water outlet pipe 5, an accommodating chamber 6 being provided inside the valve body 1, one end of the water inlet pipe 4 and the water outlet pipe 5 extending into the interior of the valve body 1 and connected to two valve seats 7, a flat gate plate 8 being provided between the two valve seats 7, a valve stem 9 being fixedly connected to the top of the flat gate plate 8, an upper sealing mechanism 10 being provided on the flat gate plate 8, a driving mechanism 11 being provided on the top of the shaft sleeve 3, a flow guide mechanism 12 being provided in the water inlet pipe 4, and a fixing mechanism 13 being provided on the top of the flow guide mechanism 12;

[0037] The upper sealing mechanism 10 includes a connecting arm 1001 extending into the interior of the accommodating chamber 6. A sealing portion 1002 is fixedly connected to the outer surface of the connecting arm 1001. The sealing portion 1002 abuts against the inner surface of the accommodating chamber 6. The outer surface of the sealing portion 1002 is provided with two first sealing grooves 1003. Two first O-type wear-resistant sealing rings 1004 are installed in the two first sealing grooves 1003.

[0038] The guide mechanism 12 includes a guide plate 1201, which is rotatably connected to the water inlet pipe 4. A placement groove 1202 is provided on the top of the guide plate 1201, and a fixed rod 1203 is fixedly connected to the placement groove 1202. The outer surface of the fixed rod 1203 is movably sleeved with a movable block 1204. The outer surface of the water inlet pipe 4 is fixedly connected with a sealing sleeve 1205, and a movable rod 1206 is movably inserted into the sealing sleeve 1205. The bottom end of the movable rod 1206 movably passes through the water inlet pipe 4 and is hinged to the movable block 1204 through a hinge seat.

[0039] like Figure 1 and Figure 6 As shown, the driving mechanism 11 includes a fixed shell 1101, which is fixedly connected to the top of the shaft sleeve 3. The top of the valve stem 9 movably passes through the valve cover 2 and the shaft sleeve 3 and extends into the fixed shell 1101. A screw 1102 is rotatably connected in the fixed shell 1101. The outer surface of the screw 1102 is threadedly connected to a moving block 1103. A limiting groove 1104 is provided on one side of the fixed shell 1101. A limiting plate 1105 is slidably connected in the limiting groove 1104. One side of the limiting plate 1105 is fixedly connected to the moving block 1103. The screw 1102, the moving block 1103, the limiting groove 1104 and the limiting plate 1105 form a driving structure. When the screw 1102 rotates in the fixed shell 1101, due to the threaded connection between the moving block 1103 and the screw 1102 and the sliding restriction of the limiting plate 1105 in the limiting groove 1104, the moving block 1103 can only move linearly up and down. At the same time, the cooperation between the limiting groove 1104 and the limiting plate 1105 provides stable guidance and support for the moving block 1103, ensuring that the moving block 1103 does not deviate or shake during movement.

[0040] like Figure 6 As shown, one side of the moving block 1103 is movably connected to two connecting hole plates 1106, and one end of the two connecting hole plates 1106 away from the moving block 1103 is rotatably connected to the fixed shell 1101. The connection parts of the two connecting hole plates 1106 and the moving block 1103 are provided with two swing guide grooves 1107, and one side of the two connecting hole plates 1106 is provided with two lifting guide grooves 1108. The two connecting hole plates 1106 are movably connected to the connecting slider 1109 through the two lifting guide grooves 1108. The fixed shell 110 1, the connecting slider 1109 is slidably connected to the limiting baffle 1110, and the bottom end of the connecting slider 1109 is fixedly connected to the valve stem 9. Through the joint cooperation among the moving block 1103, the connecting slider 1109, the screw 1102, the swing guide groove 1107, the connecting orifice plate 1106, the lifting guide groove 1108 and the limiting baffle 1110, the sliding of the connecting slider 1109 can drive the valve stem 9 and the flat gate 8 to move, thereby facilitating the opening and closing of the valve body 1.

[0041] like Figure 4 and Figure 6 As shown, the bottom of the limit plate 1105 is fixedly connected to a telescopic rod 1111, the bottom end of the telescopic rod 1111 is fixedly connected to a connecting rod 1112, the outer surface of the screw 1102 is fixedly sleeved with a worm gear 1113, and the inner side of the fixed shell 1101 is connected to a worm 1114 through a bearing, and the worm 1114 is meshingly connected to the worm gear 1113. By setting the telescopic rod 1111, it is ensured that when the flat gate 8 is closed, the guide plate 1201 swings to an inclined state, and when the flat gate 8 is opened, the guide plate 1201 swings to a horizontal state. At the same time, the meshing transmission mode of the worm gear 1113 and the worm 1114 is self-locking, which can effectively prevent the flat gate 8 and the guide plate 1201 from moving accidentally, thereby ensuring the stability of the flat gate 8 and the guide plate 1201 during operation, and ensuring the normal operation and sealing performance of the valve.

[0042] like Figure 6 As shown, one end of the worm 1114 is fixedly mounted with a rotating wheel 1115, and the inner top of the fixed shell 1101 is fixedly connected with a support plate 1116. One end of the worm 1114 is rotatably connected to the support plate 1116. The setting of the rotating wheel 1115 provides a convenient operating position for the rotation of the worm 1114. The operator can easily rotate the worm 1114 through the rotating wheel 1115. The setting of the support plate 1116 provides a stable supporting structure for the worm 1114, thereby ensuring the stability of the worm 1114 during the rotation process, reducing the transmission error caused by the shaking of the worm 1114, and improving the transmission accuracy.

[0043] like Figure 1 、 Figure 4 and Figure 5 As shown, the fixing mechanism 13 includes a fixing block 1301, which is fixedly connected to the top of the movable rod 1206, a slot 1302 is provided at the top of the fixing block 1301, and a fixing hole 1303 is provided on the outer surface of the connecting rod 1112. The outer surface of the fixing block 1301 is fixedly connected to a fixing frame 1304, and a slide 1305 is slidably connected to the inner side of the fixing frame 1304. One side of the slide 1305 is fixedly connected to a limiting rod 1306, and one end of the limiting rod 1306 is movably passed through the fixing block 1301 and the slot 1302 and extends into the fixing hole 1303. Through the cooperation of the limiting rod 1306 and the fixing hole 1303, the connecting rod 1112 can be firmly fixed on the fixing block 1301, thereby ensuring the stability of the guide plate 1201.

[0044] like Figure 4As shown, one side of the slide plate 1305 is fixedly connected to a pull rod 1307, one end of the pull rod 1307 is movable through the fixing frame 1304 and is fixedly connected to a pull ring 1308, and a return spring 1309 is sleeved on the outer surface of the pull rod 1307. When the flat gate valve needs to be maintained and overhauled, the operator can pull the pull rod 1307 through the pull ring 1308 to make the slide plate 1305 drive the limit rod 1306 to disengage from the fixing hole 1303, so as to facilitate the disassembly and separation of the connecting rod 1112 and the fixing block 1301, and facilitate the overhaul and maintenance of the flat gate valve. The return spring 1309 can automatically restore the slide plate 1305 and the limit rod 1306 to their initial positions after the operation is completed, so as to prepare for the next fixing operation, thereby improving the convenience and efficiency of the maintenance and overhaul of the flat valve.

[0045] like Figure 8 and Figure 9 As shown, two second sealing grooves 14 are provided on the inner surface of the valve cover 2, and two second O-type wear-resistant sealing rings 15 are installed in the two second sealing grooves 14. A third sealing groove 16 is provided on the top of the valve body 1, and a mid-way spiral wound gasket 17 is provided in the third sealing groove 16. The combination of the second sealing groove 14 and the second O-type wear-resistant sealing ring 15 provides an additional sealing mechanism, which effectively prevents leakage of the valve stem 9 during movement, ensures the sealing of the system, reduces the risk of leakage, and improves the overall safety of the system. The combination of the third sealing groove 16 and the mid-way spiral wound gasket 17 provides a stronger sealing effect, ensuring that the connection between the valve cover 2 and the valve body 1 can effectively prevent the leakage of liquid or gas, and improve the sealing performance of the system. The mid-way spiral wound gasket 17 has excellent elasticity and plasticity, and can adapt to deformation under extreme working conditions such as high temperature and high pressure, ensuring that the sealing effect remains consistent under various operating conditions. The design of the mid-way spiral wound gasket 17 enables it to withstand higher compression loads, so that it can effectively resist external pressure during valve operation, prevent sealing failure, and ensure the safety and stability of the system.

[0046] like Figure 7 As shown, the outer surface of the valve cover 2 is provided with a balancing hole 18 connected to the accommodating cavity 6, and a screw plug 19 is connected to the inner thread of the balancing hole 18. By providing the balancing hole 18, the gas or vacuum that may be formed in the cavity can be effectively excluded, and the occurrence of gas lock can be avoided, thereby ensuring the normal flow of the fluid. By removing the screw plug 19 with threaded connection, the pressure in the valve can be easily adjusted, thereby improving the operational flexibility and convenience.

[0047] like Figure 8As shown, the top of the valve cover 2 is provided with a mounting groove 20 filled with graphite. The bottom of the sleeve 3 extends into the mounting groove 20 and is tightly fitted with the graphite in the mounting groove 20. Graphite acts as a good solid lubricant, effectively reducing friction between the valve stem 9 and the sleeve 3, thereby improving the smoothness of the movement, ensuring flexible operation of the valve, reducing wear and energy consumption, and providing fire protection.

[0048] The use method and working principle of this device: When opening the valve, the operator rotates the wheel 1115, and the wheel 1115 drives the worm 1114 to rotate. Since the worm 1114 is engaged with the worm wheel 1113, and the worm wheel 1113 is fixedly sleeved on the screw 1102, the screw 1102 is driven to rotate. During the rotation of the screw 1102, the moving block 1103 threadedly connected thereto performs an upward linear motion under the restriction of the limit plate 1105 and the limit groove 1104. When the moving block 1103 moves upward, it passes through the connecting orifice plate 1106, the swing guide groove 1107, and the lifting guide groove. The combined action of 1108 and the connecting slider 1109 drives the valve stem 9 to move upward, thereby lifting the flat gate plate 8 upward. At this time, the valve is opened. At the same time, during the upward lifting of the flat gate plate 8, the telescopic rod 1111 drives the connecting rod 1112 to move upward synchronously, thereby driving the movable rod 1206 to move upward synchronously. Under the combined action of the placement groove 1202, the fixed rod 1203 and the movable block 1204, the guide plate 1201 is swung to a horizontal state, reducing the obstruction to the medium in the valve body 1, so that the water flow can smoothly pass through the water inlet pipe 4, the inside of the valve body 1 and flow out from the water outlet pipe 5.

[0049] In the valve closing stage, the wheel 1115 is rotated in the opposite direction to reverse the screw 1102, and the moving block 1103 moves linearly downward, thereby driving the valve stem 9 and the flat gate 8 to move downward until the flat gate 8 is closed and the water flow channel is cut off. At the same time, the telescopic rod 1111 drives the connecting rod 1112 to move downward, and the guide plate 1201 is swung to an inclined state through the fixing mechanism 13, thereby changing the flow velocity of the medium in the valve body 1, so that the flow velocity of the medium in the valve body 1 is reduced.

[0050] During the sealing stage, the valve stem 9 is connected to the sealing portion 1002 that abuts the inner surface of the accommodating chamber 6 through the connecting arm 1001 during movement. The inclined connecting arm 1001 can better fit the inner surface of the accommodating chamber 6, so that an effective contact surface is formed between the sealing portion 1002 and the inner surface of the accommodating chamber 6. At the same time, the setting of the two first sealing grooves 1003 provides an effective accommodating space, so that the two first O-type wear-resistant sealing rings 1004 can better abut against the inner wall of the accommodating chamber 6. The two first O-type wear-resistant sealing rings 1004 form multiple sealing protections, thereby improving the integrity of the seal.

[0051] During the maintenance stage, when the valve body 1 and the valve cover 2 need to be disassembled and maintained, the operator first pulls the pull ring 1308 to drive the pull rod 1307 to move, so that the slide 1305 drives the limit rod 1306 to disengage from the fixing hole 1303. At this time, the return spring 1309 is squeezed and begins to shrink, thereby releasing the restriction on the connecting rod 1112. By rotating the wheel 1115, the connecting rod 1112 moves upward, so that the connecting rod 1112 can be separated from the fixed block 1301, and the valve body 1 and the valve cover 2 can be disassembled, and then subsequent inspection and maintenance can be carried out.

[0052] Other technologies of this embodiment adopt existing technologies.

[0053] The present invention is described through preferred embodiments. Those skilled in the art will appreciate that various modifications or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A flat gate valve with zero leakage on the upper seal, characterized in that: The invention comprises a valve body (1), a valve cover (2) is bolted on the top of the valve body (1), a shaft sleeve (3) is fixedly sleeved on the outer surface of the valve cover (2), one end of the valve body (1) is fixedly connected to a water inlet pipe (4), and the other end of the valve body (1) is fixedly connected to a water outlet pipe (5), a receiving cavity (6) is provided inside the valve body (1), one end of the water inlet pipe (4) and the water outlet pipe (5) extend to the inside of the valve body (1) and are connected to two valve seats (7), a flat gate (8) is provided between the two valve seats (7), the top of the flat gate (8) is fixedly connected to a valve stem (9), an upper sealing mechanism (10) is provided on the flat gate (8), a driving mechanism (11) is provided on the top of the shaft sleeve (3), a flow guide mechanism (12) is provided in the water inlet pipe (4), and a fixing mechanism (13) is provided at the top of the flow guide mechanism (12); The upper sealing mechanism (10) comprises a connecting arm (1001) extending into the interior of the accommodating cavity (6); the outer surface of the connecting arm (1001) is fixedly connected to a sealing portion (1002); the sealing portion (1002) abuts against the inner surface of the accommodating cavity (6); the outer surface of the sealing portion (1002) is provided with two first sealing grooves (1003); two first O-type wear-resistant sealing rings (1004) are installed in the two first sealing grooves (1003); The flow guide mechanism (12) comprises a flow guide plate (1201), the flow guide plate (1201) is rotatably connected to the water inlet pipe (4), a placement groove (1202) is provided on the top of the flow guide plate (1201), a fixed rod (1203) is fixedly connected in the placement groove (1202), a movable block (1204) is movably sleeved on the outer surface of the fixed rod (1203), a sealing sleeve (1205) is fixedly connected to the outer surface of the water inlet pipe (4), a movable rod (1206) is movably inserted in the sealing sleeve (1205), and the bottom end of the movable rod (1206) movably penetrates the water inlet pipe (4) and is hinged to the movable block (1204) through a hinge seat.

2. The flat gate valve with zero leakage and upper sealing according to claim 1, characterized in that: The driving mechanism (11) comprises a fixed shell (1101), wherein the fixed shell (1101) is fixedly connected to the top of the shaft sleeve (3), the top end of the valve stem (9) movably passes through the valve cover (2) and the shaft sleeve (3) and extends into the fixed shell (1101), a screw rod (1102) is rotatably connected in the fixed shell (1101), and a moving block (1103) is threadedly connected to the outer surface of the screw rod (1102), a limiting groove (1104) is provided on one side of the fixed shell (1101), a limiting plate (1105) is slidably connected in the limiting groove (1104), and one side of the limiting plate (1105) is fixedly connected to the moving block (1103).

3. The flat gate valve with zero leakage and upper sealing according to claim 2, characterized in that: One side of the movable block (1103) is movably connected to two connecting orifice plates (1106), and one end of the two connecting orifice plates (1106) away from the movable block (1103) is rotatably connected to the fixed shell (1101), and two swing guide grooves (1107) are provided at the connection parts of the two connecting orifice plates (1106) and the movable block (1103), and two lifting guide grooves (1108) are provided on one side of the two connecting orifice plates (1106), and the two connecting orifice plates (1106) are movably connected to a connecting slider (1109) through the two lifting guide grooves (1108), and a limit baffle (1110) is fixedly connected in the fixed shell (1101), and the connecting slider (1109) is slidably connected to the limit baffle (1110), and the bottom end of the connecting slider (1109) is fixedly connected to the valve stem (9).

4. The top-sealed zero-leakage flat gate valve according to claim 3, characterized in that: The bottom of the limiting plate (1105) is fixedly connected to a telescopic rod (1111), the bottom end of the telescopic rod (1111) is fixedly connected to a connecting rod (1112), the outer surface of the screw (1102) is fixedly sleeved with a worm gear (1113), the inner side of the fixed housing (1101) is connected to a worm gear (1114) via a bearing, and the worm gear (1114) is meshedly connected to the worm gear (1113).

5. The top-sealed zero-leakage flat gate valve according to claim 4, characterized in that: A rotating wheel (1115) is fixedly mounted on one end of the worm (1114), a support plate (1116) is fixedly connected to the inner top of the fixed shell (1101), and one end of the worm (1114) is rotatably connected to the support plate (1116).

6. The top-sealed zero-leakage flat gate valve according to claim 4, characterized in that: The fixing mechanism (13) comprises a fixing block (1301), wherein the fixing block (1301) is fixedly connected to the top end of the movable rod (1206), a slot (1302) is provided at the top end of the fixing block (1301), a fixing hole (1303) is provided on the outer surface of the connecting rod (1112), a fixing frame (1304) is fixedly connected to the outer surface of the fixing block (1301), a slide (1305) is slidably connected to the inner side of the fixing frame (1304), a limiting rod (1306) is fixedly connected to one side of the slide (1305), and one end of the limiting rod (1306) movably passes through the fixing block (1301) and the slot (1302) and extends into the fixing hole (1303).

7. The top-sealed zero-leakage flat gate valve according to claim 6, characterized in that: One side of the slide plate (1305) is fixedly connected to a pull rod (1307), one end of the pull rod (1307) is movably inserted into the fixing frame (1304) and is fixedly connected to a pull ring (1308), and the outer surface of the pull rod (1307) is sleeved with a return spring (1309).

8. The top-sealed zero-leakage flat gate valve according to claim 1, characterized in that: The inner surface of the valve cover (2) is provided with two second sealing grooves (14), and two second O-type wear-resistant sealing rings (15) are installed in the two second sealing grooves (14). The top of the valve body (1) is provided with a third sealing groove (16), and a middle spiral wound gasket (17) is arranged in the third sealing groove (16).

9. The top-sealed zero-leakage flat gate valve according to claim 8, characterized in that: The outer surface of the valve cover (2) is provided with a balancing hole (18) communicating with the accommodating cavity (6), and a screw plug (19) is connected to the inner thread of the balancing hole (18).

10. The top-sealed zero-leakage flat gate valve according to claim 1, characterized in that: The top of the valve cover (2) is provided with a mounting groove (20), the mounting groove (20) is filled with graphite, and the bottom of the shaft sleeve (3) extends into the mounting groove (20) and is tightly fitted with the graphite in the mounting groove (20).

Images