An expansion cut-off door for drainage engineering

Abstract

The present invention relates to the field of water supply and drainage, and specifically to an expansion cut-off gate for drainage engineering. The gate comprises a base, a rotary cutting gate and a power mechanism, wherein the base comprises a fixed seat and a movable ring; the fixed seat is fixedly mounted on the pipe mouth, and the movable ring is rotatably mounted on the fixed seat, and an annular sealing surface is provided on the side of the movable ring away from the fixed seat, a partition plate is provided on the inner wall of the water hole, and a sealing rubber ring is provided on the annular sealing surface. During the closing process of the rotary cutting gate, in conjunction with the rotation of the movable ring, debris at the bottom of the movable ring can be transported upward under the action of the partition plate, thereby avoiding excessive accumulation of debris at the bottom. This not only facilitates the rotary cutting gate to effectively cut debris and improves the closing reliability, but also avoids excessive rubbing of debris and the annular sealing surface during cutting. At the same time, the sealing rubber ring is blocked by a block in the open state, and the sealing rubber ring does not directly contact the water body, thereby preventing the rubber ring from aging and corrosion and extending the service life of the sealing rubber ring.

Description

Technical Field

[0001] The present invention relates to the field of water supply and drainage, and in particular to an expansion type cut-off valve for drainage engineering. Background Art

[0002] In existing drainage projects, in addition to using gate-type sluices or powered flap gates to control the opening and closing of pipe orifice flow channels, expansion-type cut-off gates are also used to control pipe orifice flow channels. Expansion-type cut-off gates are a new type of drainage equipment, primarily used in urban drainage network overflow pollution control, prevention of river backflow, initial rainwater interception, and combined sewer network reconstruction. An expansion-type cut-off gate primarily consists of a base and a cut-off gate. The base is installed at the pipe orifice, and the left and right sides of the cut-off gate are rotatably connected to the base. Compared to gate-type sluices and powered flap gates, expansion-type cut-off gates have a compact structure and do not require a large installation space or a high installation height. Furthermore, when closing the pipe orifice, the cut-off gate rotates to be tangent to the edge of the base, effectively cutting off dead branches and impurities in the water body, preventing equipment jamming due to impurities in the water.

[0003] During actual use of the existing cut-off gate, as the cut-off gate rotates, the debris in the water body is pushed by the cut-off gate and concentrated at the lower part of the pipe mouth and cut off before the cut-off gate closes, resulting in excessive accumulation of debris, difficulty in cutting, and greater damage to the cut-off gate. At the same time, due to the special cutting function of the expansion cut-off gate, it is often arranged for use in relatively harsh environments, and the corrosion of the sealing structure on it is relatively serious. Moreover, due to the tangential closure of the cut-off gate, the sealing ring is easily worn, affecting the sealing performance, and further affecting the blocking effect of the pipe mouth flow channel.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0005] In view of the deficiencies of the prior art, one of the purposes of the present invention is to facilitate the gate to effectively cut off debris such as dead branches in the water body, thereby improving the reliability of closing the gate.

[0006] Another object of the present invention is to improve the sealing performance of the expansion type shear door.

[0007] The expansion type shear gate for drainage engineering of the present invention adopts the following technical solution: comprising a base, a rotary shear gate and a power mechanism;

[0008] The base includes a fixed seat and a movable ring; the fixed seat is fixedly installed at the water outlet or pipe opening of the well wall of the drainage project, and is provided with a central through hole connected to the water outlet or pipe opening; the movable ring is rotatably installed on the fixed seat and has a water hole at its center, which is coaxially connected to the central through hole of the fixed seat; the side of the movable ring away from the fixed seat is provided with an outwardly expanded annular sealing surface connected to the water hole, and the inner wall of the water hole is provided with a plurality of circumferentially evenly distributed partition plates;

[0009] The left and right sides of the rotary cutting gate are respectively connected to the left and right sides of the fixed seat for rotation to close or open the water hole. The rotary cutting gate is tangent to the annular sealing surface during the process of closing the water hole, and forms a seal with the sealing surface after closing the water hole.

[0010] The power mechanism is used to drive the rotary cutting gate to rotate around its rotation center to open and close the gate.

[0011] Optionally, the partition plate is arranged to be inclined, and the inclination direction is consistent with the rotation direction of the movable ring.

[0012] Optionally, mounting cantilevers are provided on both the left and right sides of the fixing seat, and connecting arms are provided on both the left and right sides of the rotary cutting gate, and the ends of the connecting arms are rotatably connected to the ends of the mounting cantilevers.

[0013] Optionally, the power mechanism includes a power push rod, which is capable of extension and retraction, the fixed end of the power push rod is hingedly connected to the top of the fixed seat, the output end of the power push rod is hingedly connected to the end of the connecting arm, and the hinge point is located on one side of the hinge point of the connecting arm and the mounting cantilever.

[0014] Optionally, the working surface of the rotary cutting gate is spherical, and the shape of the annular sealing surface is adapted thereto; an annular sealing cavity and a control cavity are provided on the movable ring at a position corresponding to the annular sealing surface; the sealing cavity passes through the annular sealing surface, a sealing rubber ring is provided in the sealing cavity, and the sealing rubber ring can slide along the depth direction of the sealing cavity, and a plurality of blocks are provided on the movable ring, and the blocks can slide along the width direction of the sealing cavity to cover or expose the sealing rubber ring;

[0015] The control cavity is located outside the sealing cavity. An elastic bladder wall is provided on the side of the control cavity close to the annular sealing surface. The elastic bladder wall and the side of the control cavity away from the annular sealing surface enclose each other to form a control chamber. The control chamber is connected to the sealing cavity, and the control chamber and the sealing cavity are filled with hydraulic oil.

[0016] A plurality of mounting grooves are provided on the annular sealing surface, which are connected to the control cavity. A plurality of pushing blocks are provided in the mounting grooves. The pushing blocks can slide along the depth direction of the control cavity and abut against the elastic bag wall. The pushing blocks correspond to the stop blocks one by one and act on the stop blocks. When the pushing blocks move toward the inside of the control cavity, they drive the stop blocks to move toward the control cavity to expose the sealing rubber ring.

[0017] Optionally, the sealing rubber ring is hollow inside and is open on one side close to the bottom of the sealing cavity, and the middle part of the side wall of the sealing rubber ring close to the annular sealing surface is a thin-walled structure.

[0018] Optionally, a sliding protrusion is provided on the movable ring, and guide sliding grooves are provided on both sides of the stopper, and the sliding protrusion cooperates with the guide sliding grooves.

[0019] Optionally, a guide slope is provided on one side of the pushing block close to the center of the movable ring, a connecting groove is provided on the guide slope, a connecting slider is provided at one end of the stop block, and the connecting slider is slidably provided in the connecting groove.

[0020] Optionally, the pushing block includes a guide portion and a pushing portion, the guide portion is adapted to the mounting slot and is slidably disposed in the mounting slot, and the pushing portion is disposed on a side of the guide portion away from the elastic bladder wall;

[0021] The outer peripheral surface of the pushing portion includes at least a first extrusion surface, a second extrusion surface and a pushing surface. The first extrusion surface is located on a side away from the center of the movable ring, and the first extrusion surface is inclined toward the center of the movable ring from one end connected to the guide portion to the other end. The pushing surface is located on one side of the guide portion and is coplanar with the side surface corresponding to the guide portion. The second extrusion surface is located on the opposite side of the pushing surface. The second extrusion surface is relatively inclined to the side surface corresponding to the guide portion, and the inclination direction is opposite to the rotation direction of the movable ring.

[0022] Optionally, a driving motor is provided on the fixed seat, a driving gear is provided at the output end of the driving motor, a gear ring is provided on the movable ring, and the gear ring is meshed with the driving gear.

[0023] The beneficial effects of the present invention are as follows: an expansion cut-off gate for drainage engineering of the present invention is configured as a split structure including a fixed seat and a rotating ring, and a partition plate is provided on the inner wall of the water hole of the rotating ring. During the closing process of the rotary cutting gate, in conjunction with the rotation of the movable ring, debris at the bottom of the movable ring can be transported upward under the action of the partition plate, avoiding excessive accumulation of debris at the bottom. The rotary cutting gate can complete the cutting of debris mostly in the middle and upper parts, which not only facilitates the rotary cutting gate to effectively cut debris and improves the reliability of closing, but also avoids excessive squeezing of debris and the annular sealing surface during cutting, thereby extending the service life of the annular sealing surface and improving the sealing effect.

[0024] Furthermore, by setting the pushing block and the stop block, the sealing rubber ring at the annular sealing surface is blocked by the block when the gate is open, and the sealing rubber ring does not come into direct contact with sewage or rainwater, thereby preventing the rubber ring from aging and corrosion, and extending the service life of the sealing rubber ring. In the closed state, the block cancels the blocking of the sealing rubber ring, and the sealing rubber ring and the rotary cutting gate are squeezed and sealed to improve the sealing reliability. At the same time, the sealing rubber ring is blocked when the rotary cutting gate is in the position for cutting debris or in the position when it is not cutting. After the cutting is completed, the sealing rubber ring pops out to prevent the cutting from damaging the sealing rubber ring, further extending the service life of the sealing rubber ring.

[0025] Furthermore, by making special arrangements for the structure of the pushing block, the rotary cutting gate can contact different surfaces of the pushing block during the closing process, thereby achieving the inward contraction of the pushing block to release the sealing ring and at the same time pushing the movable ring to rotate. No additional power is required to drive the movable ring to rotate, thereby improving energy utilization and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of an expansion type cut-off door for drainage engineering according to the present invention;

[0028] Figure 2 This is a front view of an expansion cut-off door for drainage engineering according to the present invention;

[0029] Figure 3 for Figure 2 Middle BB cross-section;

[0030] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0031] Figure 5 This is a schematic diagram of an expansion cut-off valve for drainage engineering in a closed state according to the present invention;

[0032] Figure 6 for Figure 5 Cross-sectional view of the state;

[0033] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0034] Figure 8 It is a structural schematic diagram of the pushing block in the present invention;

[0035] Figure 9 Schematic diagram of the structure of the stopper in the present invention;

[0036] Figure 10 This is a cutaway perspective view of an expansion-type cut-off door for drainage engineering according to the present invention in an open state;

[0037] Figure 11 for Figure 10 Enlarged view of point C in the middle.

[0038] In the picture:

[0039] 100, fixed seat; 110, limiting ring; 120, cantilever installation;

[0040] 200, movable ring; 201, water hole; 202, annular sealing surface; 203, sealing chamber; 204, control chamber; 205, elastic bladder wall; 206, control chamber; 207, sliding protrusion; 208, mounting notch; 209, partition plate;

[0041] 210, sealing rubber ring; 220, stop block; 221, guide slide; 222, connecting slider; 230, pushing block; 231, connecting slide; 232, first extrusion surface; 233, second extrusion surface; 234, pushing surface.

[0042] 300, rotary cutting gate; 310, connecting arm;

[0043] 400. Power push rod. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0045] like Figures 1 to 11 As shown, an expansion cut-off gate for drainage engineering (hereinafter referred to as expansion cut-off gate) provided by an embodiment of the present invention includes a base, a rotary cutting gate 300 and a power mechanism, and the base includes a fixed seat 100 and a movable ring 200.

[0046] The fixing seat 100 is fixedly installed at the water outlet or pipe mouth of the well wall of the drainage project. The fixing seat 100 is provided with a central through hole connected to the water outlet or pipe mouth; specifically, the fixing seat 100 is provided with a plurality of through holes. During installation, bolts and other connecting parts are inserted into the through holes to connect the fixing seat 100 to the well wall or pipe mouth.

[0047] The movable ring 200 is rotatably mounted on the fixed base 100 and has a water hole 201 in its center, which is coaxially connected to the central through hole of the fixed base 100; the side of the movable ring 200 away from the fixed base 100 is provided with an outwardly expanded annular sealing surface 202 connected to the water hole 201 (refer to Figure 10 ), a plurality of circumferentially evenly distributed partition plates 209 are provided on the inner wall of the water hole 201; to facilitate the installation of the movable ring 200, a limiting ring 110 is provided on one side of the fixed seat 100, and the movable ring 200 is coaxial with the limiting ring 110 and is rotatably connected to the limiting ring 110.

[0048] The left and right sides of the rotary cutting gate 300 are respectively rotatably connected to the left and right sides of the fixing seat 100 to close or open the water hole 201. The rotary cutting gate 300 is tangent to the annular sealing surface 202 during the process of closing the water hole 201, and forms a seal with the sealing surface after closing the water hole 201.

[0049] The power mechanism is used to drive the rotary cutting gate 300 to rotate around its rotation center to realize opening and closing.

[0050] It can be understood that in the cut-off door solution of the prior art, the base is an integral structure, and the inner wall of the flow channel for water is basically a smooth structure. During the closing process, the rotary cutting gate 300 will push the dead branches and other debris in the fluid to the bottom of the base and cut them off before closing. However, too much debris accumulates at the bottom, making it difficult for the rotary cutting gate 300 to cut, which can easily damage the rotary cutting gate 300. In addition, a large amount of debris cut at the bottom can easily be squeezed with the annular sealing surface 202, affecting the service life of the annular sealing surface 202 and reducing the sealing effect.

[0051] The solution of this embodiment is to set the base as a split structure including a fixed seat 100 and a movable ring 200, and a partition plate 209 is set on the inner wall of the water hole 201 of the movable ring 200. During the closing process of the rotary cutting gate 300, in conjunction with the rotation of the movable ring 200, the debris at the bottom of the movable ring 200 can be transported upward under the action of the partition plate 209, avoiding excessive accumulation of debris at the bottom. The rotary cutting gate 300 can complete the cutting of the debris mostly in the middle and upper part, which not only facilitates the rotary cutting gate 300 to effectively cut the debris, but also avoids excessive rubbing of the debris and the annular sealing surface 202, thereby extending the service life of the annular sealing surface 202.

[0052] Furthermore, in order to realize the installation of the rotary cutting gate 300, the preferred embodiment provided by the present invention is that installation cantilevers 120 are provided on the left and right sides of the fixing seat 100, and connecting arms 310 are provided on the left and right sides of the rotary cutting gate 300, and the end of the connecting arm 310 is rotatably connected to the end of the installation cantilever 120.

[0053] In one embodiment, the power mechanism includes a power push rod 400, which is retractable. The fixed end of the power push rod 400 is hingedly connected to the top of the fixed base 100, and the output end of the power push rod 400 is hingedly connected to the end of the connecting arm 310, and the hinge point is located on one side of the hinge point between the connecting arm 310 and the mounting cantilever 120. When the power push rod 400 is shortened, it drives the rotary cutting gate 300 to rotate toward the annular sealing surface 202 to close the gate. When the power push rod 400 is extended, it drives the rotary cutting gate 300 to rotate upward to open the gate. Specifically, the connecting arm 310 is L-shaped, and the hinge point between the connecting arm 310 and the mounting cantilever 120 is located at the end where the horizontal rod and vertical rod of the connecting arm 310 are connected. The hinge point between the power push rod 400 and the connecting arm 310 is located at the overhanging end of the horizontal rod of the connecting arm 310. The power push rod 400 can be a hydraulic rod, a pneumatic rod, an electric push rod or other power elements that can achieve the same function.

[0054] In other embodiments, the power mechanism may also be configured as a power motor, which is disposed on the mounting cantilever 120 and has an output end connected to the connecting arm 310 , thereby driving the connecting arm 310 to rotate.

[0055] In a further embodiment, the partition plate 209 is tilted and the tilt direction is consistent with the rotation direction of the movable ring 200. The partition plate 209 is set to an inclined structure so that the partition plate 209 and the inner peripheral wall of the water hole 201 form a triangular bearing area, thereby improving the reliability of the partition plate 209 in carrying debris. At the same time, when the movable ring 200 rotates, the debris can be lifted to a higher height through the partition plate 209, reducing the accumulation of debris at the bottom and facilitating cutting.

[0056] In order to realize the rotation of the movable ring 200, in one embodiment, a driving motor (not shown in the figure) can be provided on the fixed base 100, and a driving gear is provided at the output end of the driving motor. A ring gear is provided on the movable ring 200, and the ring gear is engaged with the driving gear. The driving motor drives the driving gear to rotate, and the movable ring 200 is driven to rotate through the engagement of the driving gear and the ring gear.

[0057] In a further embodiment, the working surface of the rotary cutting gate 300 (referring to the surface that blocks the water hole 201 when the gate is closed) is spherical, and the shape of the annular sealing surface 202 is adapted thereto; an annular sealing cavity 203 and a control cavity 204 are provided on the movable ring 200 at a position corresponding to the annular sealing surface 202; the sealing cavity 203 passes through the annular sealing surface 202, and a sealing rubber ring 210 is provided in the sealing cavity 203, and the sealing rubber ring 210 can slide along the depth direction of the sealing cavity 203 (the depth direction is a direction perpendicular to the annular sealing surface 202), and a plurality of blocks 220 are provided on the movable ring 200, and the blocks 220 can slide along the width direction of the sealing cavity 203 to cover or expose the sealing rubber ring 210 (the width direction refers to a direction perpendicular to the depth direction).

[0058] The control chamber 204 is located on the periphery of the sealing chamber 203 (along the radial direction of the movable ring 200, the side close to the center of the circle is inside, and the opposite is outside). An elastic bag wall 205 is provided on the side of the control chamber 204 close to the annular sealing surface 202. The elastic bag wall 205 and the side of the control chamber 204 facing away from the annular sealing surface 202 enclose a control chamber 206. The control chamber 206 is connected to the sealing chamber 203, and the control chamber 206 and the sealing chamber 203 are filled with hydraulic oil.

[0059] A plurality of mounting notches 208 are provided on the annular sealing surface 202, and the mounting notches 208 are connected to the control chamber 204. A plurality of pushing blocks 230 are provided in the mounting notches 208, and the pushing blocks 230 can slide along the depth direction of the control chamber 204. The pushing blocks 230 abut against the elastic bag wall 205. The pushing blocks 230 correspond to the stop blocks 220 one by one and act on the stop blocks 220. When the pushing blocks 230 move toward the inside of the control chamber 204, they drive the stop blocks 220 to move toward the direction close to the control chamber 204 to expose the sealing rubber ring 210. It can be understood that, in the initial state, the pushing block 230 is in the outer end limit position under the action of the elastic sac wall 205 and extends out of the annular sealing surface 202, and the stop block 220 blocks the sealing rubber ring 210; when the rotary cutting gate 300 is closed, the rotary cutting gate 300 gradually contacts the pushing block 230 and pushes the pushing block 230, so that the pushing block 230 moves toward the inside of the control chamber 204. At the same time, when the pushing block 230 moves toward the inside of the control chamber 204, the pushing block 230 squeezes the elastic sac wall 205, the volume of the control chamber 206 decreases, and the hydraulic oil in the control chamber 206 flows into the sealing chamber 203, pushing the sealing rubber ring 210 to move outward. After moving outward, the sealing rubber ring 210 abuts against the rotary cutting gate 300, thereby improving the sealing performance.

[0060] Furthermore, the interior of the sealing rubber ring 210 is hollow and one side near the bottom of the sealing cavity 203 is open. The middle part of the side wall of the sealing rubber ring 210 near the annular sealing surface 202 is a thin-walled structure. The thin-walled structure allows the sealing rubber ring 210 at this position to be deformed and protruded appropriately, thereby being able to be squeezed more tightly with the rotary cutting gate plate 300, further improving its sealing reliability with the rotary cutting gate plate 300.

[0061] It can be understood that when the expansion cut-off door of the present invention is in the open state, the pushing block 230 extends out of the movable ring 200, and the block 220 blocks the sealing rubber ring 210, so that the sealing rubber ring 210 does not come into direct contact with fluids such as sewage or rainwater, thereby preventing the sealing rubber ring 210 from aging and corrosion, improving the sealing effect of the sealing rubber ring 210, and extending the service life of the sealing rubber ring 210; when the door is closed, refer to Figure 3 In the direction shown, the rotary cutting gate 300 rotates counterclockwise. During the rotation of the rotary cutting gate 300, it gradually becomes tangent to the annular sealing surface 202 and squeezes the pushing block 230, so that the pushing block 230 moves toward the inside of the control chamber 204 and squeezes the elastic bag wall 205. The volume of the control chamber 206 is reduced, and the hydraulic oil in the control chamber 206 flows into the sealing chamber 203. At the same time, the pushing block 230 drives the block 220 to move toward the control chamber 204, and the position of the sealing rubber ring 210 covered by the moving block 220 is exposed, that is, the rotary cutting The sealing rubber ring 210 is in a covered state at the position where the gate 300 cuts the debris and at the position where it does not cut. The sealing rubber ring 210 is exposed after the rotary cutting gate 300 passes by to prevent the sealing rubber ring 210 from being damaged by cutting. After the rotary cutting gate 300 is closed in place, the rotary cutting gate 300 contacts all the pushing blocks 230, and all the blocks 220 no longer cover the sealing rubber ring 210. Under the action of the hydraulic oil, the sealing rubber ring 210 moves toward the direction close to the annular sealing surface 202, and then squeezes and seals with the rotary cutting gate 300.

[0062] When the rotary cutting gate 300 is reset from closing to opening, the rotary cutting gate 300 and each pushing block 230 are gradually separated. After the rotary cutting gate 300 is separated from the pushing block 230, the pushing block 230 is reset under the action of the elastic bag wall 205, the hydraulic oil flows back to the control chamber 206, the sealing rubber ring 210 is reset, and at the same time, the pushing block 230 drives the block 220 to reset, re-covering the sealing rubber ring 210 to protect the sealing rubber ring 210.

[0063] Furthermore, in order to enable the pushing block 230 to drive the stopper 220 to move, a sliding protrusion 207 is provided on the movable ring 200, and a guide groove 221 is provided on both sides of the stopper 220. The sliding protrusion 207 cooperates with the guide groove 221 to guide the moving direction of the stopper 220.

[0064] A guide slope is provided on one side of the pushing block 230 close to the center of the movable ring 200 , and a connecting groove 231 is provided on the guide slope. A connecting slider 222 is provided at one end of the stopper 220 , and the connecting slider 222 is slidably provided in the connecting groove 231 .

[0065] Based on the embodiment in which the pushing block 230 is provided, the present invention provides the following preferred embodiments to realize the rotation of the movable ring 200 to save power resources. Specific details are as follows:

[0066] The pushing block 230 includes a guiding portion and a pushing portion. The guiding portion is adapted to the mounting slot 208 and is slidably disposed in the mounting slot 208 . The pushing portion is disposed on a side of the guiding portion away from the elastic bag wall 205 .

[0067] The outer peripheral surface of the pushing portion includes at least a first extrusion surface 232, a second extrusion surface 233 and a pushing surface 234. The first extrusion surface 232 is located on a side away from the center of the movable ring 200, and the first extrusion surface 232 is inclined from one end connected to the guide portion to the other end toward the center of the movable ring 200. In this way, when the first extrusion surface 232 is pushed by the rotary cutting gate 300, the pushing block 230 can move along the control cavity 204; the pushing surface 234 is located on one side of the guide portion and is coplanar with the corresponding side surface of the guide portion. , with such a configuration, when the pushing surface 234 is pushed by the rotary cutting gate 300, the movable ring 200 can rotate around the set direction, and the second extrusion surface 233 is located on the opposite side of the pushing surface 234, and the second extrusion surface 233 is relatively inclined to the corresponding side surface of the guide portion, and the inclination direction is opposite to the rotation direction of the movable ring 200. With such a configuration, when the rotary cutting gate 300 contacts the second extrusion surface 233, the pushing block 230 can move toward the inside of the control chamber 204 without pushing the movable ring 200 to rotate in the opposite direction.

[0068] Reference Figure 8 As shown, the guide portion of the pushing block 230 is a rectangular structure as a whole, the pushing portion is arranged on one side of the guide portion and is in the shape of a prism as a whole, and the connecting groove 231 is arranged at the junction of the guide portion and the pushing portion.

[0069] In combination with the above embodiments, the operating principle and working process of the present invention are as follows:

[0070] When the expansion shut-off door of the present invention is in the open state, the fluid flows through the base, the pushing block 230 extends out of the movable ring 200, and the block 220 blocks the sealing rubber ring 210. The sealing rubber ring 210 does not come into direct contact with fluids such as sewage or rainwater, thereby preventing the sealing rubber ring 210 from aging and corrosion, improving the sealing effect of the sealing rubber ring 210, and extending the service life of the sealing rubber ring 210.

[0071] When closing, refer to Figure 3In the direction shown, the power push rod 400 contracts and drives the rotary cutting gate 300 to rotate counterclockwise. During the rotation of the rotary cutting gate 300, it gradually becomes tangential to the annular sealing surface 202 and gradually squeezes the pushing block 230 from top to bottom. When the rotary cutting gate 300 is initially closed, it contacts the first squeezing surface 232 of the uppermost pushing block 230 and causes the pushing block 230 to move toward the inside of the control chamber 204. The pushing block 230 moving inward squeezes the elastic bladder wall 205, and the volume of the control chamber 206 decreases. The hydraulic oil in the control chamber 206 flows into the sealing chamber 203. At the same time, the pushing block 230 drives the block 220 to move toward the control chamber 204, and the position of the sealing rubber ring 210 that was blocked by the moving block 220 is exposed. As the rotary cutting gate 300 continues to close, the left side of the rotary cutting gate 300 gradually squeezes the pushing surface 234 of the pushing block 230 at the corresponding position, thereby driving the movable ring 200 to rotate, The debris pushed at the bottom is transported upward, making it easier for the rotary cutting gate 300 to cut the debris. At the same time, the right side of the rotary cutting gate 300 contacts the second extrusion surface 233 of the corresponding pushing block 230 on the right side, so that the corresponding pushing block 230 can still move into the control cavity 204 without causing the movable ring 200 to rotate in the opposite direction; after the rotary cutting gate 300 is closed in place, the rotary cutting gate 300 contacts all the pushing blocks 230, all the pushing blocks 230 enter the control cavity 204, and all the blocks 220 no longer block the sealing rubber ring 210. Under the action of the hydraulic oil, the sealing rubber ring 210 moves toward the direction close to the annular sealing surface 202, and then squeezes and seals with the rotary cutting gate 300.

[0072] When the gate is opened again, the power push rod 400 extends and drives the rotary cutting gate 300 to rotate clockwise, and the rotary cutting gate 300 gradually separates from the pushing blocks 230. After the rotary cutting gate 300 separates from the pushing blocks 230, the pushing blocks 230 are reset under the action of the elastic bag wall 205, and the hydraulic oil flows back to the control chamber 206. The sealing rubber ring 210 is reset, and at the same time, the pushing block 230 drives the block 220 to reset, and re-covers the sealing rubber ring 210 to protect the sealing rubber ring 210.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An expansion cut-off gate for drainage engineering, characterized in that: It includes a base, a rotary cutting gate and a power mechanism; The base includes a fixed seat and a movable ring; the fixed seat is fixedly installed at the water outlet or pipe opening of the well wall of the drainage project, and is provided with a central through hole connected to the water outlet or pipe opening; the movable ring is rotatably installed on the fixed seat and has a water hole at its center, which is coaxially connected to the central through hole of the fixed seat; the side of the movable ring away from the fixed seat is provided with an outwardly expanded annular sealing surface connected to the water hole, and the inner wall of the water hole is provided with a plurality of circumferentially evenly distributed partition plates; The left and right sides of the rotary cutting gate are respectively connected to the left and right sides of the fixed seat for rotation to close or open the water hole. The rotary cutting gate is tangent to the annular sealing surface during the process of closing the water hole, and forms a seal with the sealing surface after closing the water hole. The power mechanism is used to drive the rotary cutting gate to rotate around its rotation center to open and close the gate; The working surface of the rotary cutting gate is spherical, and the shape of the annular sealing surface is adapted thereto; an annular sealing chamber and a control chamber are provided on the movable ring at positions corresponding to the annular sealing surface; the sealing chamber passes through the annular sealing surface, and a sealing rubber ring is provided in the sealing chamber, which can slide along the depth direction of the sealing chamber; a plurality of blocks are provided on the movable ring, which can slide along the width direction of the sealing chamber to cover or expose the sealing rubber ring; The control cavity is located outside the sealing cavity. An elastic bladder wall is provided on the side of the control cavity close to the annular sealing surface. The elastic bladder wall and the side of the control cavity away from the annular sealing surface enclose each other to form a control chamber. The control chamber is connected to the sealing cavity, and the control chamber and the sealing cavity are filled with hydraulic oil. A plurality of mounting notches are provided on the annular sealing surface, the mounting notches being connected to the control cavity. A plurality of pushing blocks are provided in the mounting notches. The pushing blocks can slide along the depth direction of the control cavity and abut against the elastic bag wall. The pushing blocks correspond to the stoppers one by one and act on the stoppers. When the pushing blocks move into the control cavity, they drive the stoppers to move toward the control cavity to expose the sealing rubber ring. The pushing block includes a guide portion and a pushing portion, wherein the guide portion is adapted to the mounting slot and is slidably disposed in the mounting slot, and the pushing portion is disposed on a side of the guide portion away from the elastic bag wall; The outer peripheral surface of the pushing portion includes at least a first extrusion surface, a second extrusion surface and a pushing surface. The first extrusion surface is located on a side away from the center of the movable ring, and the first extrusion surface is inclined toward the center of the movable ring from one end connected to the guide portion to the other end. The pushing surface is located on one side of the guide portion and is coplanar with the side surface corresponding to the guide portion. The second extrusion surface is located on the opposite side of the pushing surface. The second extrusion surface is relatively inclined to the side surface corresponding to the guide portion, and the inclination direction is opposite to the rotation direction of the movable ring.

2. The expansion cut-off valve for drainage engineering according to claim 1, characterized in that: The partition plate is arranged tilted, and the tilting direction is consistent with the rotation direction of the movable ring.

3. The expansion cut-off valve for drainage engineering according to claim 1, characterized in that: The left and right sides of the fixing seat are both provided with mounting cantilevers, the left and right sides of the rotary cutting gate are both provided with connecting arms, and the ends of the connecting arms are rotatably connected to the ends of the mounting cantilevers.

4. The expansion cut-off valve for drainage engineering according to claim 3, characterized in that: The power mechanism includes a power push rod, which can be extended and retracted. The fixed end of the power push rod is hingedly connected to the top of the fixed seat, and the output end of the power push rod is hingedly connected to the end of the connecting arm, and the hinge point is located on one side of the hinge point of the connecting arm and the mounting cantilever.

5. The expansion cut-off valve for drainage engineering according to claim 1, characterized in that: The sealing rubber ring is hollow inside and has an open side close to the bottom of the sealing cavity. The middle part of the side wall of the sealing rubber ring close to the annular sealing surface is a thin-walled structure.

6. The expansion cut-off valve for drainage engineering according to claim 1, characterized in that: The movable ring is provided with a sliding protrusion, and both sides of the stopper are provided with a guide sliding groove, and the sliding protrusion is matched with the guide sliding groove.

7. The expansion cut-off valve for drainage engineering according to claim 1, characterized in that: A guide slope is provided on one side of the pushing block close to the center of the movable ring, a connecting slide is provided on the guide slope, a connecting slider is provided at one end of the stopper, and the connecting slider is slidably provided in the connecting slide.

8. The expansion cut-off valve for drainage engineering according to claim 1, characterized in that: A driving motor is arranged on the fixed seat, a driving gear is arranged at the output end of the driving motor, a gear ring is arranged on the movable ring, and the gear ring is meshed with the driving gear.

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