Intelligent self-compensating seal flat gate valve

Abstract

The utility model relates to a flat gate valve of intelligent self -compensation seal belongs to flat gate valve field, for solving the hard particle in the seal pair gap, the viscous lump will continuously produce extrusion, grinding, scraping effect to rubber pad, will form scratch, pressure pit, local deformation on the rubber seal pad surface, destroy the flatness and integrality of seal surface, cause the valve micro -leakage, sealing failure etc.

Description

Technical Field

[0001] This invention relates to the field of flat gate valves, and in particular to a smart self-compensating sealing flat gate valve. Background Technology

[0002] Flat gate valves are core pipeline control equipment for transporting fluids containing impurities, such as those found in coal mining, metallurgy, petrochemicals, and mining water supply and drainage. Among them, self-compensating sealing flat gate valves, with their excellent adaptive sealing performance, are widely used in high-pressure, high-frequency fluid transport scenarios. The core sealing principle of existing self-compensating sealing flat gate valves relies on the synergistic effect of hydraulic drive and spring compensation structure to bidirectionally push the valve plate against the valve seat sealing surface. Mechanical clamping force achieves a tight fit between the valve plate and the valve seat. Simultaneously, the adaptive compensation characteristics of the spring compensate for changes in the sealing gap caused by wear of the sealing components and fluctuations in pipeline pressure during valve operation, effectively ensuring the long-term sealing reliability of the valve and solving the technical problems of loose seals, leakage during opening and closing, and poor seal adaptability in traditional gate valves.

[0003] However, when conveying complex fluids containing impurities such as mud, slag, coking compounds, and solid particles, this type of self-compensating flat gate valve still has unavoidable structural defects. During normal valve opening and closing, the valve plate rises away from the valve seat, creating a flow gap. Solid impurities and viscous clumps in the pipeline can easily enter the gap between the valve plate and the valve seat sealing pair with the fluid. When the valve closes and resets, the combined clamping force of hydraulic pressure and spring will directly and forcibly squeeze the retained impurities between the rubber sealing gasket of the valve seat and the valve plate.

[0004] Under conditions of frequent valve opening and closing and continuous pipeline pressure fluctuation, hard particles and viscous lumps in the sealing gap will continuously exert squeezing, grinding and scraping effects on the rubber gasket, forming scratches, pits and local deformation on the surface of the rubber gasket, damaging the flatness and integrity of the sealing surface, causing problems such as valve micro-leakage and sealing failure, and significantly shortening the service life of valve sealing components. Summary of the Invention

[0005] The purpose of this invention is to provide an intelligent self-compensating sealing flat gate valve, which solves the problem that hard particles and viscous lumps in the sealing pair gap will continuously exert pressure, abrasion and scraping on the rubber gasket, forming scratches, pits and local deformation on the surface of the rubber sealing gasket, damaging the flatness and integrity of the sealing surface, causing valve micro-leakage and sealing failure, and significantly shortening the service life of the valve sealing components.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an intelligent self-compensating sealing flat gate valve, comprising a valve body, a support plate disposed above the valve body, a motor fixedly connected to the upper end of the support plate, a threaded rod fixedly connected to the output end of the motor, a first connecting plate threadedly connected to the outside of the threaded rod, a hydraulic elastic plate disposed below the first connecting plate, a valve seat fixedly connected to the inside of the valve body, and an elastic sealing gasket fixedly connected to the side of the hydraulic elastic plate near the valve seat. A first bearing shell is connected to the lower part of the valve body, and a push block is fixedly connected to the inner side of the first bearing shell. Two hydraulic elastic plates are symmetrically arranged about the central axis of the first connecting plate, and the two hydraulic elastic plates are laterally slidably connected to the first connecting plate. The two hydraulic elastic plates are fixedly connected to each other by a first elastic telescopic rod. The two sides of the push block are inclined surfaces. An elastic mechanism is disposed inside the first bearing shell, and a pushing mechanism is disposed outside the elastic mechanism. The motor is used to drive the first connecting plate and the hydraulic elastic plate to rise and fall through the threaded rod. When opening, the first elastic telescopic rod stores force to make the two hydraulic elastic plates close together in the middle, so that the elastic sealing gasket does not produce relative sliding friction with the valve seat during the lifting and lowering process. When closing, the two hydraulic elastic plates open to the sides, so that the elastic sealing gasket fits against the valve seat.

[0007] Preferably, the elastic mechanism includes a second bearing shell fixedly connected to the outside of the first bearing shell, a fluid channel disposed inside the second bearing shell, a first filter screen fixedly connected to both ends of the fluid channel, a first baffle disposed on one side of the first filter screen, a second filter screen fixedly connected to the upper part of the first baffle, a hole opened inside the first baffle, a second baffle disposed inside the hole, and a third elastic telescopic rod fixedly connected to the lower end of the second baffle and fixedly connected to the first baffle.

[0008] Preferably, one end of the first filter screen is connected to the inner side of the valve seat away from the hydraulic elastic plate, and the other end of the first filter screen is connected to the inner side of the first bearing shell.

[0009] Preferably, the upper surface of the second baffle is an inclined surface, and the width of the end of the second baffle away from the first elastic telescopic rod is greater than the width of the hole, which is used to control the unidirectional flow of fluid when the hydraulic elastic plate moves.

[0010] Preferably, the elastic mechanism further includes a first groove disposed inside the first bearing shell, a second elastic telescopic rod disposed inside the first groove and fixedly connected to the first baffle, a fourth elastic telescopic rod fixedly connected to one side of the first baffle, and a sleeve disposed outside the first baffle and slidably connected to the first bearing shell. The outer side of the first baffle is in contact with the inner side of the sleeve, and the width of the first baffle is less than the width of the first groove.

[0011] Preferably, the elastic mechanism further includes a push plate disposed below the first elastic telescopic rod and fixedly connected to the inner side of the hydraulic elastic plate; The push plate is triangular at one end near the push block. Multiple triangular first guide grooves are provided on both sides of the upper end of the push block, and second guide grooves are provided on both sides of the lower end of the push block.

[0012] Preferably, the second guide groove is triangular, which is used to cause the accumulated fluid to be quickly impacted and discharged when the push plate moves to the second guide groove.

[0013] Preferably, the pushing mechanism includes a second connecting plate fixedly connected to the outside of the first connecting plate, a fifth elastic telescopic rod fixedly connected to the lower end of the second connecting plate, a third bearing shell disposed on the outside of the second bearing shell and fixedly connected to the valve body, a pipe disposed on the outside of the third bearing shell, a hydraulic channel disposed below the third bearing shell and communicating with the pipe, a push rod disposed inside the upper end of the hydraulic channel, and a third baffle fixedly connected to the upper end of the push rod. The outer side of the push rod fits into the upper interior of the hydraulic channel.

[0014] Preferably, the third baffle is used to block one end of the valve body by moving upward through the fifth elastic telescopic rod and the top rod when the second connecting plate moves downward, so that the impact fluid breaks up the viscous impurities in the closed space.

[0015] Preferably, the second filter screen is used to block the push block from entering the inner side of the first bearing shell and causing interference to the push block when the hydraulic elastic plate moves upward, under the push of the third elastic telescopic rod and the fourth elastic telescopic rod.

[0016] 1. Compared with the prior art, the beneficial effects of the present invention are as follows: when the flat gate valve is opened, the motor rotates in the opposite direction to drive the hydraulic elastic plate to move upward. The stored force of the first elastic telescopic rod causes the hydraulic elastic plate to close in the middle, so that the elastic sealing gasket does not generate relative sliding friction with the valve seat when it moves upward, and does not generate sliding friction when it moves downward when it is closed, thereby achieving the effect of reducing the wear of the rubber sealing gasket and improving the sealing performance.

[0017] 2. In this invention, the upward movement of the hydraulic elastic plate drives the push plate downward. The triangular structure of the first guide groove causes the gap between the two hydraulic elastic plates to continuously change, introducing fluid from the inside of the valve body, filtered by the first filter screen, into the gap. This pushes the impurity-free fluid out from between the valve seat and the elastic sealing gasket. This achieves the effect of pushing out impurities located between the valve seat and the sealing gasket, reducing the impact of impurities on the elastic sealing gasket.

[0018] 3. In this invention, multiple guide grooves are evenly distributed along the inclined side of the push block, causing the hydraulic elastic plate to move closer and closer to the valve seat during opening and closing, gradually compressing and expelling impurities. This achieves the effects of preventing the elastic sealing gasket from directly pressing against the valve seat, reducing the accumulation of large impurities, and improving the service life of the elastic sealing gasket.

[0019] 4. This invention uses a first guide groove whose distance to the center of the push block is less than the angle of inclination of the push block. This results in less fluid being pushed in each time compared to the initial flow rate. Fluid continuously accumulates between the hydraulic elastic plates. When the push plate enters the second guide groove for the last time, the accumulated fluid is rapidly ejected, flushing away impurities between the valve seat and the elastic sealing gasket. This achieves the effect of minimizing impurities between the valve seat and the sealing gasket during contact and improving the service life of the sealing gasket.

[0020] 5. In this invention, the downward movement of the second connecting plate drives the fifth elastic telescopic rod to push the top rod and the third baffle upward, sealing one end of the valve body. This causes the fluid in the final rapid impact to collide within the confined space, breaking up viscous impurities. This effectively prevents large impurities from quickly settling and adhering to the gap between the valve seat and the hydraulic elastic plate, which could make the hydraulic elastic plate difficult to open and damage the motor.

[0021] 6. In this invention, when the hydraulic elastic plate moves upward driven by the motor, the first baffle and the second filter screen move upward. The third elastic telescopic rod pushes the second baffle upward, and the fourth elastic telescopic rod pushes the second filter screen to one side, so that the second filter screen blocks the push block. This achieves the effect of preventing impurities from entering the inner side of the first bearing shell and interfering with the push block during normal use of the valve body. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the left-side structure of the third baffle of the present invention; Figure 3 This is a schematic diagram of the front cross-sectional structure of the pusher block of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle; Figure 5 For the present invention Figure 3 Schematic diagram of the structure at point B; Figure 6 For the present invention Figure 3 Schematic diagram of the structure at point C; Figure 7 This is a front cross-sectional view of the first connecting plate of the present invention.

[0023] In the diagram: 1. Valve body; 2. Support plate; 3. Motor; 4. Threaded rod; 5. First connecting plate; 6. Hydraulic elastic plate; 7. First bearing shell; 8. Push block; 9. First elastic telescopic rod; 10. Valve seat; 11. Elastic sealing gasket; 12. Elastic mechanism; 13. Pushing mechanism; 121. Second bearing shell; 122. Fluid channel; 123. First filter screen; 124. First groove; 125. Second elastic telescopic rod; 126. First baffle. 127. Second filter screen; 128. Hole; 129. Second baffle; 1210. Third elastic telescopic rod; 1211. Fourth elastic telescopic rod; 1212. Sleeve; 1213. Push plate; 1214. First guide groove; 1215. Second guide groove; 131. Second connecting plate; 132. Fifth elastic telescopic rod; 133. Third bearing shell; 134. Pipe; 135. Hydraulic channel; 136. Top rod; 137. Third baffle. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Please see Figures 1-7 This invention provides the following: At the intelligent control level, a flow sensor (specifically a turbine flow meter or electromagnetic flow meter, installed in the outlet pipeline of valve body 1, 100-200mm away from the sealing surface of valve seat 10) is installed on the outer side of the hydraulic elastic plate 6. When the motor 3 drives the hydraulic elastic plate 6 to its position, if the flow sensor still detects fluid passing through, the controller determines that the clamping force between the elastic sealing gasket 11 and the valve seat 10 is insufficient, resulting in a sealing gap. At this time, the controller starts an external hydraulic press, adding hydraulic fluid to the inner side of the hydraulic elastic plate 6 (i.e., the hydraulic cavity between the two hydraulic elastic plates 6) through the hydraulic pipeline, pushing the valve plate and elastic sealing gasket 11 on the inner side of the two hydraulic elastic plates 6 to further open outward, increasing the clamping force between the elastic sealing gasket 11 and the valve seat 10, until the leakage flow detected by the flow sensor drops to zero, and the controller stops the hydraulic press, achieving adaptive sealing compensation. The controller uses a PLC programmable logic controller or an embedded microcontroller (such as the STM32 series), which integrates a PID control algorithm to adjust the output pressure of the hydraulic press in a closed loop based on the feedback signal from the flow sensor. The method for determining the preset threshold is as follows: before the valve leaves the factory, the drive current value of motor 3 is measured in a leak-free state as the reference current I0, and I0 × 1.1 to 1.2 times is set as the current threshold. At the same time, the output value of the flow sensor in a zero-leak state is used as the flow threshold.

[0025] At the intelligent control level, the driver of motor 3 has a built-in current / torque monitoring module that collects the drive current or output torque signal of motor 3 during the downward movement of hydraulic elastic plate 6. After the elastic sealing gasket 11 and valve seat 10 are fully bonded, the drive current of motor 3 will rise from a stable no-load value to a stable load value. By using this stable load value as a reference sealing pressure characteristic value, and in conjunction with the upper and lower limit thresholds set by the controller, the sealing effect of each valve closing action can be evaluated in real time: if the drive current reaches the preset threshold, it is determined that the elastic sealing gasket 11 is tightly bonded to valve seat 10, and the controller sends a stop command to motor 3; if there is a gap between elastic sealing gasket 11 and valve seat 10 due to impurities, and the bonding resistance is insufficient, the drive current of motor 3 cannot reach the preset threshold. In this case, the controller does not send a stop command, and motor 3 continues to drive hydraulic elastic plate 6 downward. The inclined surface of push block 8 further pushes the two hydraulic elastic plates 6 outward, increasing the clamping force between elastic sealing gasket 11 and valve seat 10, and realizing adaptive sealing compensation.

[0026] The device consists of a valve body 1, a support plate 2, a motor 3, a threaded rod 4, a first connecting plate 5, a hydraulic elastic plate 6, a first bearing shell 7, a push block 8, a valve seat 10, an elastic sealing gasket 11, an elastic mechanism 12, and a pushing mechanism 13.

[0027] The lateral sliding connection between the hydraulic elastic plate 6 and the first connecting plate 5 is achieved through the following structure: a T-shaped groove (inverted T-shaped cross-section) is formed on the lower surface of the first connecting plate 5, and a T-shaped slider is correspondingly provided at the upper end of the hydraulic elastic plate 6. The T-shaped slider is embedded in the T-shaped groove and can slide freely laterally along the groove. Limiting blocks are provided at both ends of the T-shaped groove of the first connecting plate 5 to prevent the hydraulic elastic plate 6 from detaching from the end during sliding. The T-shaped slider and the T-shaped groove are clearance-fitted (0.2-0.5mm clearance on one side) and coated with grease to reduce sliding friction. At the same time, an anti-detachment flange is also provided at the upper end of the hydraulic elastic plate 6, which cooperates with the anti-detachment groove on the lower surface of the first connecting plate 5 to ensure that the hydraulic elastic plate 6 will not detach from the first connecting plate 5 during lifting and lowering. Thus, while the first connecting plate 5 drives the hydraulic elastic plate 6 to lift and lower, the hydraulic elastic plate 6 can slide freely laterally along the first connecting plate 5.

[0028] The first elastic telescopic rod 9 consists of an outer sleeve, an inner sliding rod, and a compression spring. The outer sleeve is a hollow cylindrical structure, with one end fixedly connected to a hydraulic elastic plate 6 on one side. One end of the inner sliding rod is inserted into the outer sleeve, and the other end is fixedly connected to the hydraulic elastic plate 6 on the other side. The compression spring is located inside the outer sleeve, sleeved on the outside of the inner sliding rod, with its two ends abutting against the bottom of the outer sleeve and the end of the inner sliding rod, respectively. When the two hydraulic elastic plates 6 are pushed outward by the inclined surface of the push block 8, the inner sliding rod is further inserted into the outer sleeve, and the compression spring is compressed and stores force. When the inclined surface force of the push block 8 decreases or disappears, the compression spring releases its elastic force, pushing the inner sliding rod outward and causing the two hydraulic elastic plates 6 to close and reset towards the middle. The number of first elastic telescopic rods 9 is 2-4, equidistantly distributed along the height direction of the hydraulic elastic plates 6 to ensure balanced force distribution.

[0029] When the flat gate valve needs to be closed, the starter motor 3 drives the threaded rod 4 to rotate. Because the threaded rod 4 is threadedly connected to the first connecting plate 5, the first connecting plate 5 drives the hydraulic elastic plate 6 to move downward. The two hydraulic elastic plates 6 are symmetrically arranged about the central axis of the first connecting plate 5 and are laterally slidably connected to the first connecting plate 5. The two hydraulic elastic plates 6 are fixedly connected to each other by the first elastic telescopic rod 9.

[0030] When the hydraulic elastic plate 6 contacts the upper end of the push block 8, the two sides of the push block 8 are inclined surfaces, which push the hydraulic elastic plate 6 to move outward, so that the elastic sealing gasket 11 is tightly pressed onto the valve seat 10.

[0031] It should be noted that "no relative sliding friction" in this scheme means that when the hydraulic elastic plates 6 are in the lifting and lowering state, the two hydraulic elastic plates 6 are brought together in the middle under the elastic force of the first elastic telescopic rod 9, causing the elastic sealing gasket 11 to separate from the sealing surface of the valve seat 10 (i.e., a gap of 0.5-2mm is formed between the sealing gasket and the valve seat). In this state, there is no contact pressure between the sealing gasket and the valve seat, so no sliding friction is generated. Only when the hydraulic elastic plates 6 have moved to their positions does the inclined surface of the push block 8 push the hydraulic elastic plates 6 to open outward, causing the elastic sealing gasket 11 to adhere to the valve seat 10 to form a seal. Therefore, the contact and friction between the sealing gasket and the valve seat only exist in the static pressing stage after the position is reached. During the lifting and lowering process, the sealing gasket and the valve seat do not contact each other, so no relative sliding friction is generated.

[0032] When the flat gate valve is opened, the motor 3 rotates in the reverse direction, and the two hydraulic elastic plates 6 move upward. The first elastic telescopic rod 9 stores force to drive the hydraulic elastic plates 6 to close in the middle, so that the elastic sealing gasket 11 does not generate relative sliding friction with the valve seat 10 when it moves upward, and does not generate sliding friction when it moves downward. This greatly reduces the wear of the rubber sealing gasket 11, maintains the sealing fit accuracy for a long time, and effectively improves the overall sealing performance.

[0033] Since the elastic sealing gasket 11 has no sliding contact throughout the process, before the sealing gasket and valve seat 10 are attached, media impurities are very likely to accumulate in the gap between the two. If they are directly and rigidly attached and pressed, the impurities will be trapped between the sealing surfaces, causing the sealing gasket to be squeezed and deformed, worn, and the sealing to fail, which will greatly shorten the service life of the sealing gasket.

[0034] It should be noted that the width of the top cavity of valve body 1 is greater than the width of the middle channel of valve body 1, and a tapered transition section is provided between the top cavity and the middle channel. When the hydraulic elastic plate 6 moves downward to the junction of the top cavity and the middle channel, the hydraulic elastic plate 6 has not yet contacted the inclined surface of the push block 8 (the push block 8 is located below the middle channel), so there is no problem of "being forced to open outward while being blocked by the side wall of the top cavity". When the hydraulic elastic plate 6 continues to move downward and fully enters the middle channel, the hydraulic elastic plate 6 begins to contact the inclined surface of the push block 8. At this time, the hydraulic elastic plate 6 has completely detached from the top cavity, and the space on both sides is the wide area of ​​the middle channel, so there will be no jamming. In addition, the part where the hydraulic elastic plate 6 contacts the push block 8 is provided with a rounded transition (R3-R5mm) guide slope. This guide slope cooperates with the inclined surface of the push block 8, so that the hydraulic elastic plate 6 slides smoothly outward under the push of the push block 8. The inclined surface angle of push block 8 is 15°-30°, which, together with the guide slope at the bottom of hydraulic elastic plate 6, ensures smooth sliding without jamming.

[0035] To solve this problem, the supporting elastic mechanism 12 works synchronously during the reciprocating motion of the hydraulic elastic plate 6 upward and downward.

[0036] The elastic mechanism 12 includes a second bearing shell 121, a fluid channel 122, a first filter screen 123, a first groove 124, a second elastic telescopic rod 125, a first baffle 126, a second filter screen 127, a hole 128, a second baffle 129, a third elastic telescopic rod 1210, a fourth elastic telescopic rod 1211, a sleeve 1212, a push plate 1213, a first guide groove 1214, and a second guide groove 1215.

[0037] The fluid driving force originates from the opening and closing motion of the hydraulic elastic plates 6 in the horizontal direction, which changes the volume of the gap between the two hydraulic elastic plates 6. When the hydraulic elastic plates 6 open outward, the gap volume increases, forming a local low-pressure area; when the hydraulic elastic plates 6 close inward to reset, the gap volume decreases, and the fluid is squeezed out. This process is similar to the working principle of a plunger pump—the lateral movement of the hydraulic elastic plates 6 acts as the "piston" of the pump, driving the fluid flow. This driving force comes from the pushing force of the inclined surface of the push block 8 against the hydraulic elastic plates 6 and the elastic force of the first elastic telescopic rod 9.

[0038] The movement relationship between the first baffle 126 and the sleeve 1212 is as follows: the outer side of the first baffle 126 slides against the inner side of the sleeve 1212, and the first baffle 126 can float vertically up and down within the sleeve 1212. When the push plate 1213 moves downward and pushes the first baffle 126, the first baffle 126 moves downward against the elastic force of the second elastic telescopic rod 125; when the push plate 1213 moves upward and away from the first baffle 126, the second elastic telescopic rod 125 pushes the first baffle 126 back to its original position. The width of the first baffle 126 is smaller than the width of the first groove 124, so that it will not interfere with the sidewall of the first groove 124 during its up and down floating process. The driving force for the upward movement of the first baffle 126 comes from the release of the elastic force of the second elastic telescopic rod 125 and the fourth elastic telescopic rod 1211, and the driving force for the downward movement comes from the mechanical push of the push plate 1213.

[0039] The push plate 1213 is fixedly connected to the inner side of the hydraulic elastic plate 6, located below the first elastic telescopic rod 9, with one end near the push block 8 being triangular. Multiple triangular first guide grooves 1214, evenly distributed along the hypotenuse of the push block 8, are provided on both sides of the upper end of the push block 8, and triangular second guide grooves 1215 are provided on both sides of the lower end of the push block 8. Because the push plate 1213 is always in close contact with the outer side of the push block 8 under the elastic force of the first elastic telescopic rod 9, when the push plate 1213 contacts and engages with the first guide groove 1214, it will adaptively adjust the hydraulic elastic plate 6 to the inner and outer sides according to the groove structure, causing the gap between the two hydraulic elastic plates 6 to continuously and dynamically change.

[0040] The compressed fluid is located in the gap area between the two hydraulic elastic plates 6 and between the hydraulic elastic plates 6 and the inner wall of the valve body 1. When the two hydraulic elastic plates 6 open outward under the action of the inclined surface of the push block 8, the gap volume between the two hydraulic elastic plates 6 increases, and the gap volume between the hydraulic elastic plates 6 and the inner wall of the valve body 1 decreases. The fluid is pushed from the inner wall side of the valve body 1 to the space between the two hydraulic elastic plates 6. When the two hydraulic elastic plates 6 close inward under the elastic force of the first elastic telescopic rod 9, the gap volume between the two hydraulic elastic plates 6 decreases, and the fluid is squeezed outward from this gap area. During this process, although the total volume of the valve body 1 does not change, the spatial distribution on both sides of the hydraulic elastic plates 6 changes. It is this dynamic change in spatial distribution that drives the flow of fluid.

[0041] The first filter screen 123 is made of stainless steel woven mesh with a filtration accuracy of 50-200 mesh (corresponding to an aperture of 0.074-0.3mm), which can effectively intercept solid particle impurities larger than this size. For viscous clumps, the first filter screen 123, in conjunction with fluid impact and high pressure differential, can partially break up or intercept large viscous substances. However, for micron-sized colloidal particles, the filtration effect is limited. The "cleanliness" of the clean fluid refers to the removal of hard particles that may cause scratches or damage to the sealing surface. The core of this device is to use the filtered clean fluid to flush the sealing gap. Those skilled in the art can select a filter screen with an appropriate mesh size according to the actual impurity particle size distribution of the medium in the pipeline.

[0042] When the gap between the two sets of hydraulic elastic plates 6 increases, the fluid inside the valve body 1 is squeezed and pushed from one end of the first filter screen 123 (connected to the inner side of the valve seat 10 away from the hydraulic elastic plate 6) through the fluid channel 122 to the other end of the first filter screen 123 (connected to the inner side of the first bearing shell 7). After the fluid is fully filtered by the first filter screen 123, solid impurities are removed, forming a clean fluid without impurities.

[0043] The second baffle 129 is located inside the hole 128, which is formed inside the first baffle 126, connecting the inner side of the first bearing shell 7 with the side of the valve seat 10 away from the hydraulic elastic plate 6. The second baffle 129 is a one-way valve structure, allowing fluid to flow only from the inner side of the first bearing shell 7 to the valve seat 10 (i.e., unidirectional flow from bottom to top). When flowing in the opposite direction, the second baffle 129 tightly seals the hole 128 under the combined action of fluid pressure and the elastic force of the third elastic telescopic rod 1210. When the clean fluid between the hydraulic elastic plates 6 is squeezed outward, the clean fluid attempts to flow back from the sealing gap between the valve seat 10 and the elastic sealing gasket 11 to the inner side of the first bearing shell 7. If this backflow occurs, it will bring the discharged impurities back to the sealing gap. By sealing the hole 128, the second baffle 129 cuts off the path of the clean fluid flowing back from the sealing gap to the first bearing shell 7, thereby ensuring that the discharged clean fluid and impurities do not flow back to the sealing gap, ensuring the cleanliness of the sealing surface.

[0044] The upper surface of the second baffle 129 is inclined, and the width of the end away from the first elastic telescopic rod 9 is greater than the width of the hole 128. At this time, the second baffle 129 completely blocks and seals the hole 128, and the clean fluid will not flow back from the sealing gap between the hydraulic elastic plate 6 and the valve seat 10, thus completely preventing impurities from entering the sealing gap again and reducing the squeezing and friction damage of hard impurities on the elastic sealing gasket 11.

[0045] When the push plate 1213 moves and embeds into the first guide groove 1214, the first elastic telescopic rod 9 pulls the two hydraulic elastic plates 6 together and resets in the middle, squeezing the clean fluid inside to flow outward. The fluid is discharged outward from the first filter screen 123 on the side of the valve seat 10 away from the hydraulic elastic plate 6, and from the gap between the valve seat 10 and the elastic sealing gasket 11. The high-speed fluid can directly push out and flush out the residual impurities that are stuck between the valve seat 10 and the elastic sealing gasket 11, thoroughly remove impurities from the sealing surface, and reduce the wear and sealing interference of impurities on the sealing structure.

[0046] Because the push block 8 has gradually sloping sides, and the first guide groove 1214 is evenly distributed in multiple sets along the inclined side of the push block 8, the hydraulic elastic plate 6 gradually moves closer to the valve seat 10 during the dynamic adjustment process of opening and closing multiple times. The sealing gap gradually shrinks, and the particle size and quantity of impurities that can be retained in the gap continuously decrease, achieving the effect of step-by-step compression and step-by-step impurity removal. Through multiple fluid flushing and step-by-step compression to clean the gap, the elastic sealing gasket 11 is prevented from directly and rigidly pressing against the valve seat 10, eliminating the damage to the sealing surface caused by impurities, and significantly improving the service life of the elastic sealing gasket 11.

[0047] The inward closing of the hydraulic elastic plate 6 is driven by the elastic force of the first elastic telescopic rod 9. The closing speed is related to the magnitude of the spring force and the fluid resistance. Under normal operating conditions, although the closing speed is not high (approximately 10-50 mm / s), the cross-sectional area of ​​the sealing gap is very small (gap width approximately 0.5-2 mm). According to the continuity equation, the local flow velocity of the fluid within the narrow gap can reach a relatively high level (several times the movement speed of the hydraulic elastic plate). Although the impact intensity of the high-speed fluid is limited and cannot be compared with that of a high-power water pump, it is sufficient to blow away tiny particulate impurities suspended in the sealing gap. Combined with repeated reciprocating flushing, it can effectively reduce the amount of impurities remaining in the sealing gap.

[0048] The purpose of filtration is to transform fluid containing impurities into clean fluid free of hard particles, which is then used to flush the sealing surfaces. Although impurities still exist inside the valve body 1 (filtered onto the first filter screen 123 or deposited at the bottom of the first support shell 7), the clean fluid flushing the sealing gaps prevents new impurities from being introduced into the sealing surfaces. After the sealing gaps are cleaned by the clean fluid, the impurities are flushed to the bottom of the valve body 1 or inside the first support shell 7, away from the sealing area. The impurities do not disappear, but are transferred from a harmful location between the sealing surfaces to a location that does not harm the seal. A drain port can be provided at the bottom of the first support shell 7 to periodically discharge deposited impurities.

[0049] In actual physical processes, the intake flow rate and the discharge flow rate are equal in each complete cycle (conforming to the law of conservation of mass). This device utilizes the instantaneous flow difference—at the moment the hydraulic elastic plate 6 rapidly closes, the instantaneous peak value of the discharge flow rate is greater than the instantaneous peak value of the intake flow rate, generating a pulsed high-speed scouring effect. During repeated opening and closing, the clean fluid continuously replaces the impurity-containing fluid within the sealing gap, gradually replacing the fluid within the sealing gap with clean fluid. The term "accumulation" refers to the gradual enrichment of clean fluid and the gradual reduction of impurity concentration in the area between the hydraulic elastic plates 6, rather than a net increase in fluid volume. When the push plate 1213 enters the second guide groove 1215 for the last time, the clean fluid enriched in this area is discharged under instantaneous high pressure, creating the scouring effect.

[0050] Because the inward distance of the first guide groove 1214 towards the center of the push block 8 is less than the downward slope of the inclined side of the push block 8, the fluid flow rate discharged by the push plate 1213 each time its inner side closes and squeezes is greater than the fluid flow rate sucked in when the gap expands. Clean fluid continuously accumulates between the two hydraulic elastic plates 6, and its storage capacity gradually increases. The width of the second guide groove 1215 is greater than the width of the first guide groove 1214. When the push plate 1213 is inserted into the second guide groove 1215 for the last time, a large amount of clean fluid accumulated in the previous period is instantly and rapidly discharged, performing high-intensity flushing of the sealing gap. This ensures that there are almost no impurities remaining in the gap before the valve seat 10 and the elastic sealing gasket 11 are fitted, further guaranteeing the sealing fit accuracy and improving the service life of the elastic sealing gasket 11. The entire flushing and impurity removal process only utilizes the pipeline's own medium fluid, without the need for external fluid, which can strictly guarantee the purity of the medium fluid inside the pipeline and prevent external contamination.

[0051] Simultaneously, the actuator 13 operates in sync. The actuator 13 includes a second connecting plate 131, a fifth elastic telescopic rod 132, a third bearing shell 133, a pipe 134, a hydraulic channel 135, a push rod 136, and a third baffle 137. The second connecting plate 131 is fixedly connected to the outside of the first connecting plate 5. When the first connecting plate 5 moves downward, it drives the fifth elastic telescopic rod 132 to move downward synchronously. The fifth elastic telescopic rod 132 presses down, pushing the medium inside the hydraulic channel 135 and the pipe 134 upward, thereby driving the push rod 136 and the third baffle 137 to move upward, sealing one end of the medium channel inside the valve body 1. This creates a sealed flushing chamber inside the valve body. The clean fluid from the final high-speed impact creates turbulent collisions and high-pressure disturbances within the sealed space, effectively breaking up viscous impurities with strong viscosity in the pipeline. This prevents large particles and viscous impurities from settling and adhering to the sealing gap between the valve seat 10 and the hydraulic elastic plate 6, thus preventing impurities from causing the hydraulic elastic plate 6 to jam or fail to open and close. At the same time, it also prevents the motor 3 from being overloaded and damaged.

[0052] When the gate valve needs to be opened and the hydraulic elastic plate 6 needs to be retracted, the motor 3 reverses to drive the hydraulic elastic plate 6 to move upward as a whole, simultaneously causing the first baffle 126 and the second filter screen 127 to move upward. The third elastic telescopic rod 1210 pushes the second baffle 129 to spring upward and reset, and the fourth elastic telescopic rod 1211 pushes the second filter screen 127 to slide laterally and unfold. After unfolding, the second filter screen 127 completely covers the upper opening of the push block 8. During the normal operation of the gate valve, it can prevent impurities and dirt from entering the interior of the first bearing shell 7, avoiding the accumulation of impurities that interfere with the guiding and telescopic movements of the push block 8 and the push plate 1213, and ensuring the long-term stable operation of the mechanism.

[0053] The outer side of the first baffle 126 slides and fits against the inner side of the sleeve 1212, and the width of the first baffle 126 is smaller than the width of the first groove 124. In conjunction with the second elastic telescopic rod 125, the first baffle 126 achieves adaptive elastic floating, ensuring precise coordination of fluid channel opening and closing, impurity blocking, and fluid circulation.

[0054] In summary, this device reduces gasket wear through a frictionless opening and closing structure, achieves step-by-step impurity removal through multi-stage dynamic gap adjustment, achieves high-pressure final flushing through flow difference accumulation, breaks up viscous impurities through a sealed cavity, and, in conjunction with an opening and closing dustproof protection structure, comprehensively improves the sealing stability, self-cleaning ability, and overall service life of the flat gate valve.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A smart self-compensating sealing flat gate valve, comprising a valve body (1), a support plate (2) disposed above the valve body (1), a motor (3) fixedly connected to the upper end of the support plate (2), a threaded rod (4) fixedly connected to the output end of the motor (3), a first connecting plate (5) threadedly connected to the outside of the threaded rod (4), a hydraulic elastic plate (6) disposed below the first connecting plate (5), a valve seat (10) fixedly connected inside the valve body (1), and an elastic sealing gasket (11) fixedly connected to the side of the hydraulic elastic plate (6) near the valve seat (10), characterized in that, The valve body (1) is connected to a first bearing shell (7) below. A push block (8) is fixedly connected to the inner side of the first bearing shell (7). Two hydraulic elastic plates (6) are symmetrically arranged about the central axis of the first connecting plate (5), and the two hydraulic elastic plates (6) are laterally slidably connected to the first connecting plate (5). The two hydraulic elastic plates (6) are fixedly connected to each other by a first elastic telescopic rod (9). The two sides of the push block (8) are inclined surfaces. An elastic mechanism (12) is provided inside the first bearing shell (7), and a pushing mechanism (13) is provided on the outer side of the elastic mechanism (12). The motor (3) is used to drive the first connecting plate (5) and the hydraulic elastic plate (6) to rise and fall through the threaded rod (4). When it is open, the first elastic telescopic rod (9) stores force to make the two hydraulic elastic plates (6) close together in the middle, so that the elastic sealing gasket (11) does not produce relative sliding friction with the valve seat (10) during the rising and falling process. When it is closed, the two hydraulic elastic plates (6) open to both sides, so that the elastic sealing gasket (11) fits against the valve seat (10).

2. The intelligent self-compensating sealing flat gate valve according to claim 1, characterized in that, The elastic mechanism (12) includes a second bearing shell (121) fixedly connected to the outside of the first bearing shell (7), a fluid channel (122) disposed inside the second bearing shell (121), a first filter screen (123) fixedly connected to both ends of the fluid channel (122), a first baffle (126) disposed on one side of the first filter screen (123), a second filter screen (127) fixedly connected to the upper end of the first baffle (126), a hole (128) opened inside the first baffle (126), a second baffle (129) disposed inside the hole (128), and a third elastic telescopic rod (1210) fixedly connected to the lower end of the second baffle (129) and fixedly connected to the first baffle (126).

3. The intelligent self-compensating sealing flat gate valve according to claim 2, characterized in that, One end of the first filter screen (123) is connected to the inner side of the valve seat (10) away from the hydraulic elastic plate (6), and the other end of the first filter screen (123) is connected to the inner side of the first bearing shell (7).

4. The intelligent self-compensating sealing flat gate valve according to claim 2, characterized in that, The upper surface of the second baffle (129) is an inclined surface, and the width of the end of the second baffle (129) away from the first elastic telescopic rod (9) is greater than the width of the hole (128), which is used to control the unidirectional flow of fluid when the hydraulic elastic plate (6) moves.

5. The intelligent self-compensating sealing flat gate valve according to claim 2, characterized in that, The elastic mechanism (12) further includes a first groove (124) disposed inside the first bearing shell (7), a second elastic telescopic rod (125) disposed inside the first groove (124) and fixedly connected to the first baffle (126), a fourth elastic telescopic rod (1211) fixedly connected to one side of the first baffle (126), and a sleeve (1212) disposed outside the first baffle (126) and slidably connected to the first bearing shell (7). The outer side of the first baffle (126) is in contact with the inner side of the sleeve (1212), and the width of the first baffle (126) is smaller than the width of the first groove (124).

6. The intelligent self-compensating sealing flat gate valve according to claim 2, characterized in that, The elastic mechanism (12) also includes a push plate (1213) disposed below the first elastic telescopic rod (9) and fixedly connected to the inner side of the hydraulic elastic plate (6). The push plate (1213) is triangular at one end near the push block (8). Multiple triangular first guide grooves (1214) are provided on both sides of the upper end of the push block (8) and are equidistantly distributed along the hypotenuse of the push block (8). Second guide grooves (1215) are provided on both sides of the lower end of the push block (8).

7. The intelligent self-compensating sealing flat gate valve according to claim 6, characterized in that, The second guide groove (1215) is triangular and is used to cause the accumulated fluid to be quickly impacted and discharged when the push plate (1213) moves to the second guide groove (1215).

8. The intelligent self-compensating sealing flat gate valve according to claim 1, characterized in that, The pushing mechanism (13) includes a second connecting plate (131) fixedly connected to the outside of the first connecting plate (5), a fifth elastic telescopic rod (132) fixedly connected to the lower end of the second connecting plate (131), a third bearing shell (133) fixedly connected to the valve body (1) on the outside of the second bearing shell (121), a pipe (134) fixedly connected to the outside of the third bearing shell (133), a hydraulic channel (135) located below the third bearing shell (133) and connected to the pipe (134), a push rod (136) located inside the upper end of the hydraulic channel (135), and a third baffle (137) fixedly connected to the upper end of the push rod (136). The outer side of the push rod (136) fits against the upper interior of the hydraulic channel (135).

9. A smart self-compensating sealing flat gate valve according to claim 8, characterized in that, The third baffle (137) is used to block one end of the inner side of the valve body (1) when the second connecting plate (131) moves downward through the fifth elastic telescopic rod (132) and the top rod (136), so that the impact fluid breaks up the viscous impurities in the closed space.

10. A smart self-compensating sealing flat gate valve according to claim 5, characterized in that, The second filter screen (127) is used to block the push block (8) from entering the inner side of the first bearing shell (7) and causing interference to the push block (8) when the hydraulic elastic plate (6) moves upward, under the push of the third elastic telescopic rod (1210) and the fourth elastic telescopic rod (1211).

Images