River water plugging device and method for hydropower station technical water supply system pipe network

Abstract

The invention discloses a hydropower station technology water supply system pipe network river water plugging device and method.The hydropower station technology water supply system pipe network river water plugging device comprises a limiting disc, an annular groove is formed in the outer circumferential wall of the limiting disc, an air ring is installed in the annular groove, an air inlet nozzle of the air ring upwards penetrates through the limiting disc in a sealed mode, a cavity is formed in the limiting disc, and an air bag is fixedly installed on the lower side face of the limiting disc; an air inlet pipe is fixedly installed on the upper side face of the limiting disc, a valve is arranged on the air inlet pipe, and the air inlet pipe is communicated with the cavity; a limiting device is further installed on the limiting disc and used for fixing the limiting disc and the pipeline. The air ring is installed on the limiting disc, the air bag is installed on the lower side of the limiting disc, double protection is achieved through the air bag and the air ring, the limiting disc can be fixed to the pipeline through the limiting device, and therefore the situations that a single air bag leaks water easily and slides out of the pipeline easily, the single air bag is broken, and river water flows backwards can be prevented, and the safety risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy and hydropower engineering, and in particular to a device and method for blocking river water in a pipe network of a technical water supply system of a hydropower station. Background Art

[0002] A hydropower station's technical water supply system is a crucial component of hydropower unit operation, primarily providing circulating cooling water for unit cooling, lubrication, and turbine shaft seals. This system typically consists of a water source, a booster pump station, water filtration equipment, a water distribution network, water-using equipment, and monitoring equipment. The distribution network is the key link connecting the water source and water-using equipment. During hydropower station operation, the technical water supply system requires regular network upgrades to meet unit upgrades or system optimization needs.

[0003] In the technical water supply system of a hydropower station, the drainage pipe is usually directly connected to the downstream pipeline of the reservoir. Therefore, if the drainage pipe is not effectively blocked during the pipe network renovation construction, it is very likely that the river water will flow back during the construction process, causing serious safety accidents such as flooding of the power plant and damage to equipment. Therefore, it is of great significance to develop an efficient, safe and reliable drainage pipe blocking technology. Currently, a single airbag is generally used to seal the drainage pipe. However, if the water pressure in the drainage pipe suddenly increases, the single airbag is prone to leaking, slipping out of the drainage pipe, or even rupturing, which poses a significant safety risk during operation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to solve the problems existing in the above-mentioned background technology, and to provide a river water blocking device for the pipeline network of the technical water supply system of a hydropower station. By installing an air ring on the limit plate and installing an air bag on the lower side of the limit plate, the air bag and the air ring are doubly protected, and the limit plate can also be fixed to the pipeline by a limit device, thereby preventing a single air bag from leaking, slipping out of the pipeline, and preventing a single air bag from rupturing and backflowing of river water, thereby reducing safety risks.

[0005] Another technical problem to be solved by the present invention is to provide a method for blocking river water in the pipe network of the technical water supply system of a hydropower station.

[0006] In order to achieve the above-mentioned technical features, the purpose of the present invention is achieved as follows: A river water blocking device for the pipeline network of the technical water supply system of a hydropower station includes a limit plate, an annular groove is provided on the outer circumferential wall of the limit plate, an air ring is installed in the annular groove, the air inlet nozzle of the air ring passes through the limit plate upward and sealed, the interior of the limit plate has a cavity, an air bag is fixedly installed on the lower side of the limit plate, the air bag is connected with the cavity, an air intake pipe is fixedly installed on the upper side of the limit plate, a valve is provided on the air intake pipe, and the air intake pipe is connected with the cavity; a limiting device is also installed on the limit plate, and the limiting device is used to fix the limit plate to the pipeline.

[0007] The limiting plate includes a supporting plate, a fixed ring, a sliding plate and a sliding ring. The fixed ring is fixedly connected to the lower side of the supporting plate, and the sliding ring is fixedly connected to the upper side of the sliding plate. A plurality of limiting grooves are axially arranged on the inner wall of the fixing ring. The limiting grooves are formed with steps at the lower end of the fixing ring. A plurality of protrusions are arranged on the upper end of the outer wall of the sliding ring at positions corresponding to the limiting grooves. The upper end of the sliding ring is inserted into the fixing ring, and the protrusions are slidably installed in the limiting grooves. The annular groove is formed in the area outside the fixing ring between the supporting plate and the sliding plate, and the cavity is formed in the area inside the fixing ring. There is a gap between the sliding ring and the fixing ring to allow gas to flow.

[0008] The sliding plate is provided with an annular groove on the outside of the sliding ring, and the outer wall of the lower end of the fixed ring is provided with a first sealing groove, and a first sealing ring is installed in the first sealing groove. When the sliding plate moves upward, the lower end of the fixed ring is inserted into the annular groove, and the first sealing ring cooperates with the annular groove to form a seal.

[0009] A plurality of positioning rods are fixedly installed on the top of the sliding plate. The positioning rods slide upward and pass through the support plate in a sealed manner. A limiting ring is fixedly installed on the top of the positioning rod. A spring is also installed on the positioning rod between the limiting ring and the support plate. A mark for indicating the position of the sliding plate is also provided on the positioning rod.

[0010] The inner wall of the through hole on the support plate through which the positioning rod passes is provided with a second sealing groove, in which a second sealing ring is installed, and the second sealing ring slides and cooperates with the positioning rod for sealing.

[0011] A third sealing groove is provided on the outer circumferential wall of the sliding plate, and a third sealing ring is installed in the third sealing groove.

[0012] The limiting device includes a limiting plate and a pushing device. A plurality of limiting plates are installed on the upper side of the limiting plate for radial sliding along the circumferential direction. The limiting plate is also installed with a pushing device, which is connected to the limiting plate and is used to drive the limiting plate to move telescopically.

[0013] A plurality of sliding grooves are radially arranged on the upper side surface of the limit plate along the circumferential direction, and a limit plate is slidably installed in each of the sliding grooves, and the pushing device is connected to the limit plate.

[0014] The pushing device includes a connecting disk, a worm gear and a worm. The worm gear is fixedly mounted on the upper side of the connecting disk. The connecting disk and the worm gear are both rotatably mounted on the intake pipe. Two shaft seats are fixedly mounted on the limiting disk. The two ends of the worm are rotatably mounted on the two shaft seats respectively. The worm is located on one side of the worm gear. The worm and the worm gear are meshed for transmission. One end or both ends of the worm extend out of the shaft seat, and the end of the worm extending out of the shaft seat forms a driving part; a fixed column is fixedly provided on the limiting plate, and a plurality of hinge seats are fixedly provided on the outer circumference of the connecting disk. The fixed column on each limiting plate is movably connected to the corresponding hinge seat through a connecting rod; the connecting rod deviates from the central axis of the limiting plate.

[0015] A method for blocking river water in a pipe network of a hydropower station's technical water supply system, using the aforementioned device for blocking river water in a pipe network of a hydropower station's technical water supply system, comprises the following steps: S1. Place the river water blocking device into the pipeline through the air inlet pipe. The support plate and the sliding plate are then moved together by the spring. The lower end of the fixing ring is inserted into the annular groove, and the fixing ring and the sliding plate are sealed. S2. Connect the air inlet pipe to the compressed air supply pipe. With the valve open, inflate the airbag. When the mark on the positioning rod moves down to the preset position, the airbag and the pipe form a primary seal. Close the valve and stop the air supply from the compressed air supply pipe. S3. Inflate the air ring through the air inlet nozzle of the air ring. During inflation, the air ring gradually expands, and the air ring and the pipe form a secondary seal. As the air ring is further inflated, the spring is further compressed, and the lower end of the fixed ring is released from the annular groove. The air in the cavity enters the annular groove through the gap between the sliding ring and the fixed ring, thereby squeezing the air ring. S4. Fix the limit plate to the pipeline through the limit device installed on the limit plate; S5. During the blocking process, the spring force causes the sliding plate to move upward, squeezing the air ring. If river water flows back into the pipeline, the river water squeezes the airbag, causing the airbag to deform and the air in the airbag to be squeezed. The air in the cavity is further squeezed into the ring groove, so that the air ring and the inner wall of the pipeline are more tightly combined. If the river water seeps through the air bag, the river water squeezes the sliding plate, and if the sliding plate moves upward, the sliding plate will further squeeze the air ring; If the airbag is damaged, the river water pressure is borne by the sliding plate, the air ring is further squeezed, the sliding plate moves up, and the lower end of the fixed ring is inserted into the annular groove, so that the fixed ring and the sliding plate are sealed.

[0016] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: 1. The limit plate of the present invention can be fixed in the pipeline through a limit device. The ring groove provides space for the installation of the air ring. The air ring forms a seal with the inner wall of the pipeline after inflation. The air inlet nozzle is used to inflate the air ring. The air bag also forms a seal with the inner wall of the pipeline after inflation. The air inlet pipe is used to inflate the air bag. The valve is used to close the air bag after inflation to prevent gas leakage in the air bag. Through the dual protection of the air bag and the air ring, the present invention can prevent a single air bag from leaking, slipping out of the pipeline, and backflow of river water if a single air bag ruptures, thereby reducing safety risks.

[0017] 2. There is a gap between the sliding ring and the fixed ring of the present invention that allows gas to flow. When the airbag is squeezed, the gas in the airbag will enter the cavity and then enter the outside of the fixed ring through this gap, thereby squeezing the air ring and increasing the pressure inside the air ring.

[0018] 3. If the airbag of the present invention is damaged, the air inside will leak out. At this point, the airbag will fold, and the river water pressure will be borne by the sliding plate, further squeezing the air ring and improving the seal between the air ring and the pipe. Simultaneously, the sliding plate moves upward, inserting the lower end of the retaining ring into the annular groove, sealing the retaining ring and the sliding plate. River water entering through the air guide hole is confined within the cavity, preventing it from overflowing from the upper and lower sides of the air ring onto the upper side of the limit plate.

[0019] 4. Due to the obstruction of the limit plate, the inflation status of the airbag cannot be observed in the present invention. When the pressure in the airbag increases to a certain value, the pressure in the cavity will also increase, and the spring will begin to be compressed. At this time, it can be observed through the mark. If the position between the support plate and the mark changes, the inflation of the airbag can be stopped.

[0020] 5. Since the present invention is provided with a spring, after the air ring is inflated, the spring can also compress the air ring to improve the sealing between the air ring and the inner wall of the pipeline.

[0021] 6. When the pressure of the air ring of the present invention reaches a threshold value, the lower end of the fixed ring will leave the annular groove. At this time, a small amount of air in the airbag will enter the space between the air ring and the fixed ring, squeezing the air ring. In this way, after the airbag is squeezed and deformed by the pressure of the pressurized river water, the pressure in the space between the air ring and the fixed ring will increase, thereby squeezing the air ring, so that there is a greater pressure between the air ring and the inner wall of the pipe.

[0022] 7. The outer circumferential wall of the sliding plate of the present invention is provided with a third sealing groove, in which a third sealing ring is installed to improve the sealing effect between the sliding plate and the inner wall of the pipe, thereby preventing water from seeping from the edge of the sliding plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application 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.

[0024] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the top structure of the present invention.

[0026] Figure 3 for Figure 2 Schematic diagram of the AA cross-section structure.

[0027] Figure 4 for Figure 2 Schematic diagram of the BB cross-section structure.

[0028] Figure 5 This is a schematic diagram of the main structure of the worm gear and the connecting disc of the present invention.

[0029] Figure 6 It is a schematic top view of the worm gear and the connecting disc of the present invention.

[0030] Figure 7 for Figure 2 Schematic diagram of the CC cross-section structure.

[0031] Figure 8 It is a schematic cross-sectional structural diagram of the fixed ring and the sliding ring of the present invention.

[0032] Figure 9 This is a schematic diagram of the state when the present invention is placed in a pipeline and the gas ring is not pressurized.

[0033] Figure 10 This is a schematic diagram of the state of the present invention when it is placed in a pipeline and the gas ring is pressurized.

[0034] Reference numerals: Limiting plate 100, annular groove 101, cavity 102, Support plate 110, slide groove 111, shaft seat 112, second sealing groove 113, second sealing ring 114; Fixed ring 120, limiting groove 121, step 122, first sealing groove 123, first sealing ring 124; Sliding plate 130, air guide hole 131, third sealing groove 132, third sealing ring 133, annular groove 134; Sliding ring 140, extension portion 141; Limiting plate 150, fixing column 151, central axis 152; Pushing device 160, connecting plate 161, worm gear 162, worm 163, driving part 164, hinge seat 165, pin 166; Positioning rod 170, spring 171, limiting ring 172, mark 173; Connecting rod 180; Air ring 200, air inlet nozzle 201; Airbag 300, air inlet port 301, flange 302, flange 303, screw 304; Inlet pipe 400, valve 410; Pipeline 500. DETAILED DESCRIPTION

[0035] 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 creative efforts are within the scope of protection of the present invention.

[0036] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0037] Example 1: See also Figure 1-3 A river water blocking device for a water supply system in a hydropower station includes a limit plate 100, an annular groove 101 is provided on the outer circumferential wall of the limit plate 100, an air ring 200 is installed in the annular groove 101, an air inlet nozzle 201 of the air ring 200 passes through the limit plate 100 upward and sealed, a cavity 102 is provided inside the limit plate 100, an air bag 300 is fixedly installed on the lower side of the limit plate 100, the air bag 300 is communicated with the cavity 102, an air intake pipe 400 is fixedly installed on the upper side of the limit plate 100, a valve 410 is provided on the air intake pipe 400, and the air intake pipe 400 is communicated with the cavity 102; a limiting device is also installed on the limit plate 100, and the limiting device is used to fix the limit plate 100 to the pipeline 500.

[0038] The limiting plate 100 can be fixed within the pipe 500 through a limiting device. The annular groove 101 provides space for the installation of the air ring 200. After inflation, the air ring 200 forms a seal with the inner wall of the pipe 500. The air inlet nozzle 201 is used to inflate air into the air ring 200. The air bag 300 also forms a seal with the inner wall of the pipe 500 after inflation. The air inlet pipe 400 is used to inflate air into the air bag 300. The valve 410 is used to close after the air bag 300 is inflated to prevent gas leakage within the air bag 300. Through the dual protection of the air bag 300 and the air ring 200, the present invention can prevent a single air bag from leaking, slipping out of the pipe, and backflow of river water if a single air bag ruptures, thereby reducing safety risks.

[0039] Example 2: Based on Example 1, see Figure 3 The limiting plate 100 includes a support plate 110, a fixed ring 120, a sliding plate 130, and a sliding ring 140. The fixed ring 120 is welded to the lower side of the support plate 110, and the sliding ring 140 is welded to the upper side of the sliding plate 130. The inner wall of the fixed ring 120 is axially provided with a plurality of limiting grooves 121. The limiting grooves 121 are formed with steps 122 at the lower end of the fixed ring 120. The upper end of the outer wall of the sliding ring 140 is provided with a plurality of protrusions 141 at positions corresponding to the limiting grooves 121. The upper end of the sliding ring 140 is inserted into the fixed ring 120, and the protrusions 141 are slidably mounted within the limiting grooves 121. A gap is formed between the sliding ring 140 and the fixed ring 120 to allow gas to circulate. Between the support plate 110 and the sliding plate 130, the annular groove 101 is formed in the area outside the fixed ring 120, and the cavity 102 is formed in the area inside the fixed ring 120.

[0040] Specifically, see Figure 3 、 8 The sliding ring 140 passes through the fixed ring 120 from bottom to top, and the protruding portion 141 is located in the limiting groove 121. The sliding ring 140 can only move up and down but cannot rotate, and when the protruding portion 141 abuts against the step 122, the fixed ring 120 and the sliding ring 140 are limited to prevent the fixed ring 120 and the sliding ring 140 from detaching, thereby playing a guiding and limiting role.

[0041] In this embodiment, the air ring 200 can form a seal between the support plate 110 and the sliding plate 130 by itself in an inflated state, or the air ring 200 can be bonded to the support plate 110 and the sliding plate 130 by a flexible structural adhesive to form a seal.

[0042] And because there is a gap between the sliding ring 140 and the fixed ring 120 that allows gas to flow, when the airbag 300 is squeezed, the gas in the airbag 300 will enter the cavity 102, and then pass through this gap to the outside of the fixed ring 120, thereby squeezing the air ring 200, thereby increasing the pressure inside the air ring 200.

[0043] In this embodiment, see Figure 3 The airbag 300 has an air inlet opening 301 with a flange 302 at its end. A flange 303 is mounted on the flange 302. An air guide hole 131 is provided in the middle of the sliding plate 130. The air inlet opening 301 is aligned with the air guide hole 131. The threaded end of the screw 304 passes through the holes in the flange 303 and the flange 302, and then is screwed into the sliding ring 140 for securement. Both the air ring 200 and the airbag 300 are made of rubber.

[0044] Example 3: Based on Example 2, see Figure 3 The sliding plate 130 is provided with an annular groove 134 on the outer side of the sliding ring 140. The outer wall of the lower end of the fixed ring 120 is provided with a first sealing groove 123. A first sealing ring 124 is installed in the first sealing groove 123. When the sliding plate 130 moves upward, the lower end of the fixed ring 120 is inserted into the annular groove 134, and the first sealing ring 124 cooperates with the annular groove 134 to form a seal. If the airbag 300 is damaged, the air inside the airbag 300 will leak out. At this time, the airbag 300 will collapse, and the river water pressure will be borne by the sliding plate 130. The air ring 200 is further squeezed, further improving the sealing between the air ring 200 and the pipe 500. At the same time, the sliding plate 130 moves upward, and the lower end of the fixing ring 120 is inserted into the annular groove 134, so that the fixing ring 120 and the sliding plate 130 are sealed, and the river water entering from the air guide hole 131 is sealed in the cavity 102, preventing the river water from overflowing from the upper and lower sides of the air ring 200 to the upper side of the limit plate 100.

[0045] The first sealing ring 124 may be an O-ring.

[0046] Example 4: Based on Example 3, see Figure 3 、 7A plurality of positioning rods 170 are fixedly mounted on the top of the sliding plate 130. The positioning rods 170 slide upward and sealably pass through the support plate 110. A limit ring 172 is fixedly mounted on the top of the positioning rods 170. A spring 171 is mounted on the positioning rods 170 between the limit ring 172 and the support plate 110. The positioning rods 170 are also provided with markings 173 for indicating the position of the sliding plate 130. With this structure, when the airbag 300 is inflated, the spring 171 acts to insert the lower end of the fixing ring 120 into the annular groove 134, sealing the cavity 102 and preventing compressed air from leaking to the air ring 200. This allows the compressed air to pass through the cavity 102 and then enter the airbag 300.

[0047] Due to the obstruction of the limit plate 100, the inflation status of the airbag 300 cannot be observed. When the pressure in the airbag 300 increases to a certain value, the pressure in the cavity 102 will also increase, and the spring 171 begins to be compressed. At this time, it can be observed through the mark 173. If the position between the support plate 110 and the mark 173 changes, the inflation of the airbag 300 can be stopped.

[0048] Since the spring 171 is provided, after the air ring 200 is inflated, the spring 171 can also compress the air ring 200 to improve the sealing between the air ring 200 and the inner wall of the pipe 500.

[0049] When the pressure of the air ring 200 reaches the threshold, the lower end of the fixed ring 120 will leave the annular groove 134. At this time, a small amount of air in the airbag 300 will enter the space between the air ring 200 and the fixed ring 120, squeezing the air ring 200. In this way, after the airbag 300 is squeezed and deformed by the pressure of the pressurized river water, the pressure in the space between the air ring 200 and the fixed ring 120 will increase, thereby squeezing the air ring 200, so that there is a greater pressure between the air ring 200 and the inner wall of the pipe 500.

[0050] Specifically, see Figure 7 The inner wall of the through hole of the support plate 110 through which the positioning rod 170 passes is provided with a second sealing groove 113. A second sealing ring 114 is installed in the second sealing groove 113. The second sealing ring 114 slides and seals with the positioning rod 170. The second sealing ring 114 can be a Y-shaped sealing ring.

[0051] Example 5: Based on Example 4, see Figure 3 A third sealing groove 132 is provided on the outer circumferential wall of the sliding plate 130 , and a third sealing ring 133 is installed in the third sealing groove 132 to improve the sealing effect between the sliding plate 130 and the inner wall of the pipe 500 . To prevent water from seeping from the edge of the sliding plate 130 .

[0052] In this embodiment, the third sealing ring 133 is a V-shaped sealing ring.

[0053] Example 6: On the basis of Example 1 or 2 or 3 or 4 or 5, see Figures 1 to 6 The limiting device includes a limiting plate 150 and a pushing device 160. A plurality of limiting plates 150 are radially slidably installed on the upper side of the limiting disk 100 in the circumferential direction. The limiting disk 100 is also equipped with a pushing device 160, which is connected to the limiting plate 150 and is used to drive the limiting plate 150 to move telescopically.

[0054] See also Figure 2 、 4 A plurality of slide grooves 111 are radially provided on the upper side of the limit plate 100 along the circumferential direction. A limit plate 150 is slidably installed in each of the slide grooves 111 , and the pushing device 160 is connected to the limit plate 150 .

[0055] Specifically, see Figures 2 to 6 The pushing device 160 includes a connecting plate 161, a worm wheel 162 and a worm 163. The worm wheel 162 is fixedly mounted on the upper side of the connecting plate 161. The connecting plate 161 and the worm wheel 162 are both rotatably mounted on the intake pipe 400. Two shaft seats 112 are fixedly mounted on the limiting plate 100. The two ends of the worm 163 are rotatably mounted on the two shaft seats 112 respectively. The worm 163 is located on one side of the worm wheel 162. The worm 163 is meshed with the worm wheel 162 to transmit the air. The worm 163 extends out of the shaft seat 112 at one end or both ends, and the driving portion 164 is formed by extending one end of the worm 163 out of the shaft seat 112. A fixing column 151 is fixed on the limiting plate 150, and a plurality of hinge seats 165 are fixed on the outer circumference of the connecting disk 161. The fixing column 151 on each limiting plate 150 is movably connected to the corresponding hinge seat 165 through a connecting rod 180. The connecting rod 180 deviates from the central axis 152 of the limiting plate 150.

[0056] When it is necessary to fix the limiting plate 100 to the inner wall of the pipe 500, refer to Figure 2 The driving part 164 can be a quadrilateral or hexagonal column structure, which is rotated by a wrench to drive the worm 163 to rotate, thereby driving the worm wheel 162, and the worm wheel 162 drives the connecting plate 161 to rotate. Figure 2 When the connecting disk 161 rotates clockwise, the limiting plates 150 are pushed outward, so that all the limiting plates 150 are synchronously and tightly pressed against the inside of the pipe 500.

[0057] When the connecting disk 161 rotates counterclockwise, the limiting plate 150 is pulled inward, thereby separating the limiting plate 150 from the pipe 500 .

[0058] See also Figure 3The lower end of the air intake pipe 400 is provided with a mounting section with an outer diameter smaller than that of the upper end. The lower end of the air intake pipe 400 passes through the support plate 110 and is welded and sealed on the support plate 110. The air intake pipe 400 is rotatably mounted on the mounting section located on the upper side of the support plate 110 and is provided with the connecting disc 161 and the worm gear 162. The connecting disc 161 and the worm gear 162 can be welded into one, or a plurality of pins 166 can be installed between the connecting disc 161 and the worm gear 162 to connect and fix them into one.

[0059] Example 7: Based on Example 5 or 6, see Figure 3 、 9 10. A method for blocking river water in a pipe network of a hydropower station's technical water supply system, using the aforementioned device for blocking river water in a pipe network of a hydropower station's technical water supply system, the method comprising the following steps: S1. Place the river water blocking device into the pipeline 500 through the air intake pipe 400. The support plate 110 and the sliding plate 130 are then brought together by the spring 171. The lower end of the fixing ring 120 is inserted into the annular groove 134, sealing the fixing ring 120 with the sliding plate 130. The air intake pipe 400 is made of steel and has a certain length, allowing the river water blocking device to be suspended in the pipeline 500.

[0060] S2. Connect the air inlet pipe 400 to the compressed air supply pipe. When the valve 410 is open, inflate the airbag 300. When the mark 173 on the positioning rod 170 moves down to the preset position, the airbag 300 and the pipe 500 form a primary seal. Close the valve 410 and stop the air supply from the compressed air supply pipe.

[0061] S3. Inflate the air ring 200 through the air inlet nozzle 201 of the air ring 200. During inflation, the air ring 200 gradually expands, forming a secondary seal between the air ring 200 and the pipe 500. As the air ring 200 is further inflated, the spring 171 is further compressed, the lower end of the fixed ring 120 is released from the annular groove 134, and the air in the cavity 102 enters the annular groove 101 through the gap between the sliding ring 140 and the fixed ring 120, squeezing the air ring 200. After the airbag 300 is squeezed and deformed by the pressurized river water pressure, the pressure in the space between the air ring 200 and the fixed ring 120 increases, thereby squeezing the air ring 200 and creating a higher pressure between the air ring 200 and the inner wall of the pipe 500.

[0062] S4. Fix the limiting plate 100 and the pipeline 500 through the limiting device installed on the limiting plate 100 to prevent the river water blocking device from being separated from the pipeline 500.

[0063] S5. During blocking, the elastic force of the spring 171 causes the sliding plate 130 to tend to move upward, and the sliding plate 130 squeezes the air ring 200.

[0064] If river water flows back into the pipe 500, the river water squeezes the airbag 300, causing the airbag 300 to deform, squeezing the air in the airbag 300. The air in the cavity 102 is further squeezed into the annular groove 101, so that the air ring 200 is more tightly bonded to the inner wall of the pipe 500. If the river water seeps through the air bag 300, the river water squeezes the sliding plate 130. If the sliding plate 130 moves upward, the sliding plate 130 further squeezes the air ring 200. If airbag 300 is damaged, the air inside will leak out, causing it to collapse. According to the formula F=PA, where F represents pressure, P represents pressure intensity, and A represents the area under force, the river water pressure is borne by sliding plate 130, further squeezing air ring 200 and improving the seal between air ring 200 and pipe 500. Simultaneously, sliding plate 130 moves upward, inserting the lower end of retaining ring 120 into annular groove 134, sealing retaining ring 120 with sliding plate 130. River water entering through air guide hole 131 is confined within cavity 102, preventing it from overflowing from the upper and lower sides of air ring 200 onto the upper side of limit plate 100.

[0065] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Any modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A river water blocking device for a water supply system pipe network of a hydropower station, characterized by: The invention comprises a limiting plate (100), wherein an annular groove (101) is provided on the outer circumferential wall of the limiting plate (100), an air ring (200) is installed in the annular groove (101), an air inlet nozzle (201) of the air ring (200) upwardly and sealingly passes through the limiting plate (100), an interior of the limiting plate (100) has a cavity (102), an air bag (300) is fixedly installed on the lower side of the limiting plate (100), the air bag (300) is communicated with the cavity (102), an air inlet pipe (400) is fixedly installed on the upper side of the limiting plate (100), a valve (410) is provided on the air inlet pipe (400), and the air inlet pipe (400) is communicated with the cavity (102); a limiting device is also installed on the limiting plate (100), and the limiting device is used to fix the limiting plate (100) and the pipeline (500).

2. The river water blocking device for the pipe network of the technical water supply system of a hydropower station according to claim 1, characterized in that: The limiting plate (100) comprises a support plate (110), a fixed ring (120), a sliding plate (130) and a sliding ring (140), wherein the fixed ring (120) is fixedly connected to the lower side of the support plate (110), and the sliding ring (140) is fixedly connected to the upper side of the sliding plate (130). The inner wall of the fixed ring (120) is axially provided with a plurality of limiting grooves (121), the limiting grooves (121) are formed with steps (122) at the lower end of the fixed ring (120), and the upper end of the outer wall of the sliding ring (140) is formed at the corresponding limiting grooves (121). ) are provided with a plurality of protruding portions (141), the upper end of the sliding ring (140) is inserted into the fixed ring (120), and the protruding portions (141) are slidably installed in the limiting groove (121); between the support plate (110) and the sliding plate (130), the annular groove (101) is formed in the area outside the fixed ring (120), and the cavity (102) is formed in the area inside the fixed ring (120); and there is a gap between the sliding ring (140) and the fixed ring (120) to allow gas to circulate.

3. The device for blocking river water in a pipe network of a hydropower station's technical water supply system according to claim 2, characterized in that: The sliding plate (130) is provided with an annular groove (134) on the outer side of the sliding ring (140), and the outer wall of the lower end of the fixed ring (120) is provided with a first sealing groove (123). A first sealing ring (124) is installed in the first sealing groove (123). When the sliding plate (130) moves upward, the lower end of the fixed ring (120) is inserted into the annular groove (134), and the first sealing ring (124) cooperates with the annular groove (134) to form a seal.

4. The device for blocking river water in a pipe network of a hydropower station's technical water supply system according to claim 3, characterized in that: A plurality of positioning rods (170) are fixedly installed on the top of the sliding plate (130). The positioning rods (170) slide upward and sealably pass through the support plate (110). A limiting ring (172) is fixedly installed on the top of the positioning rod (170). A spring (171) is also installed on the positioning rod (170) between the limiting ring (172) and the support plate (110). A mark (173) for indicating the position of the sliding plate (130) is also provided on the positioning rod (170).

5. The device for blocking river water in a pipe network of a hydropower station's technical water supply system according to claim 4, characterized in that: The positioning rod (170) passes through the inner wall of the through hole on the support plate (110) and is provided with a second sealing groove (113). A second sealing ring (114) is installed in the second sealing groove (113). The second sealing ring (114) and the positioning rod (170) are slidably matched and sealed.

6. The device for blocking river water in a pipe network of a hydropower station's technical water supply system according to claim 2, characterized in that: A third sealing groove (132) is provided on the outer circumferential wall of the sliding plate (130), and a third sealing ring (133) is installed in the third sealing groove (132).

7. The river water blocking device for the pipe network of the technical water supply system of a hydropower station according to claim 1, characterized in that: The limiting device comprises a limiting plate (150) and a pushing device (160), wherein a plurality of limiting plates (150) are mounted on the upper side of the limiting disk (100) in a radially sliding manner along the circumferential direction, and the limiting disk (100) is further mounted with a pushing device (160), the pushing device (160) being connected to the limiting plate (150), and the pushing device (160) being used to drive the limiting plate (150) to telescopically move.

8. The river water blocking device for the pipe network of the technical water supply system of a hydropower station according to claim 7, characterized in that: The upper side surface of the limiting disk (100) is radially provided with a plurality of sliding grooves (111) along the circumferential direction, and a limiting plate (150) is slidably installed in each of the sliding grooves (111), and the pushing device (160) is connected to the limiting plate (150).

9. The river water blocking device for the pipe network of the technical water supply system of a hydropower station according to claim 8, characterized in that: The pushing device (160) includes a connecting plate (161), a worm wheel (162) and a worm (163). The worm wheel (162) is fixedly mounted on the upper side of the connecting plate (161). The connecting plate (161) and the worm wheel (162) are both rotatably mounted on the intake pipe (400). Two shaft seats (112) are fixedly mounted on the limiting plate (100). The two ends of the worm (163) are rotatably mounted on the two shaft seats (112). The worm (163) is located on one side of the worm wheel (162). The worm (163) is meshed with the worm wheel (162). The transmission is combined, one end or both ends of the worm (163) extend out of the shaft seat (112), and one end of the worm (163) extending out of the shaft seat (112) forms a driving portion (164); a fixing column (151) is fixed on the limit plate (150), and a plurality of hinge seats (165) are fixed on the outer circumference of the connecting disk (161); the fixing column (151) on each limit plate (150) is movably connected to the corresponding hinge seat (165) through a connecting rod (180); the connecting rod (180) deviates from the central axis (152) of the limit plate (150).

10. A method for blocking river water in a pipe network of a hydropower station's technical water supply system, using the device for blocking river water in a pipe network of a hydropower station's technical water supply system according to claim 4, the method comprising the following steps: S1. Place the river water blocking device into the pipe (500) through the air inlet pipe (400). At this time, the support plate (110) and the sliding plate (130) are moved closer together under the action of the spring (171). The lower end of the fixing ring (120) is inserted into the annular groove (134). The fixing ring (120) and the sliding plate (130) are sealed. S2. Connect the air inlet pipe (400) to the compressed air supply pipe, and inflate the air bag (300) with the valve (410) open. When the mark (173) on the positioning rod (170) moves down to the preset position, the air bag (300) and the pipe (500) form a primary seal. Close the valve (410) and stop the air supply from the compressed air supply pipe. S3, inflating the air ring (200) through the air inlet nozzle (201) of the air ring (200); during inflation, the air ring (200) gradually expands, and the air ring (200) and the pipe (500) form a secondary seal. As the air ring (200) is further inflated, the spring (171) is further compressed, and the lower end of the fixed ring (120) is released from the annular groove (134); the air in the cavity (102) passes through the gap between the sliding ring (140) and the fixed ring (120) and enters the annular groove (101) to squeeze the air ring (200); S4, fixing the limiting plate (100) and the pipe (500) by means of a limiting device installed on the limiting plate (100); S5. During blocking, the elastic force of the spring (171) causes the sliding plate (130) to tend to move upward, and the sliding plate (130) squeezes the air ring (200); If river water flows back into the pipe (500), the river water squeezes the airbag (300), causing the airbag (300) to deform, squeezing the air in the airbag (300), and further squeezing the air in the cavity (102) into the annular groove (101), so that the air ring (200) and the inner wall of the pipe (500) are more tightly combined; If the river water seeps through the air bag (300), the river water squeezes the sliding plate (130), and if the sliding plate (130) moves upward, the sliding plate (130) further squeezes the air ring (200); If the air bag (300) is damaged, the river water pressure is borne by the sliding plate (130), the air ring (200) is further squeezed, the sliding plate (130) moves upward, and the lower end of the fixing ring (120) is inserted into the annular groove (134), so that the fixing ring (120) and the sliding plate (130) are sealed.

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