Device for preventing river water from flowing backwards in power plant

Abstract

The invention belongs to the technical field of control equipment, and discloses a power plant river water backflow prevention device which comprises a valve body and further comprises an adjusting mechanism arranged on the outer wall of the valve body; the number of the connecting mechanisms is two, one connecting mechanism is arranged on the outer wall of the adjusting mechanism, and the other connecting mechanism is arranged on the outer wall of the valve body; the valve element is arranged in the inner wall of the valve body through a fixing mechanism, and the outer wall of the connecting plate is slidably connected with a sliding block; the adjusting mechanism comprises an adjusting channel; wherein the connecting mechanism comprises a connecting plate; through cooperation of the connecting plate, the sliding block and other structures, the positions of the bolt holes in the sliding block are adjusted, the device and an external pipeline can be connected and fixed through the positioning bolts, and therefore when the positions of the flange bolt holes of the external pipeline are different, adjustment and installation can be conducted through the connecting mechanism, and adaptability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of control equipment, in particular to a device for preventing river water backflow in a power plant. Background Art

[0002] The power plant's river water backflow prevention device is installed at the connection point between the power plant and the river (such as the drainage pipe outlet, sewage pipe outlet, etc.). Through water level monitoring, valve automatic control, check structure design, etc., it prevents river water from backflowing into the power plant when the river water level rises abnormally, thereby avoiding equipment damage, unit shutdown and other safety accidents. Its core function is to achieve flood protection through physical barriers, intelligent monitoring and linkage control mechanisms. It belongs to the cross-application category of the power engineering safety protection field and the water conservancy disaster prevention and mitigation field.

[0003] In some existing technologies, power plant drainage systems utilize check valves installed on the plant's pipes to prevent river water from backflowing. However, in practice, frequent check valve actuation can lead to seal failure and a loose seal. This can easily cause water to flow through the pipes into the hydropower plant's buildings even when the river level is low, flooding equipment and causing significant damage. Summary of the Invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a device for preventing river water backflow in a power plant.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a device for preventing river water backflow in a power plant, comprising a valve body, and also comprising: an adjusting mechanism, the adjusting mechanism being arranged on the outer wall of the valve body; a connecting mechanism, the connecting mechanism being provided with two groups, one group of connecting mechanisms being arranged on the outer wall of the adjusting mechanism, and the other group of connecting mechanisms being arranged on the outer wall of the valve body; a valve core, the valve core being arranged in the inner wall of the valve body through a fixing mechanism; a water flow direction detection mechanism, which automatically starts to control the adjusting mechanism to cut off the water flow when it finds that river water flows into the pipeline in the opposite direction, thereby achieving the purpose of preventing river water backflow.

[0006] Among them, the connecting mechanism includes a connecting plate, the outer wall of which is slidably connected to a slider; the adjusting mechanism includes an adjusting channel, the inner wall of which is slidably connected to a moving rod; the fixing mechanism includes a mounting block, the outer wall of which is slidably connected to a moving ring.

[0007] Preferably, the outer wall of the connecting plate is provided with a sliding groove, the outer wall of the connecting plate is provided with a guide groove, the outer wall of the connecting plate is fixedly connected to a connecting tube, the outer wall of the connecting tube is provided with a circular groove, the outer wall of the connecting tube is slidably connected to a circular ring, the slider is hinged to the outer wall of the circular ring through a hinge rod, the outer wall of the slider is fixedly connected to a guide block, the outer wall of the circular ring is fixedly connected to a fixed block A, and the inner wall of the fixed block A is elastically connected to a circular rod through an elastic member A.

[0008] Preferably, the guide block is slidably connected to the inner wall of the guide groove, one end of the hinged rod is hinged to the outer wall of the ring, and the other end of the hinged rod is hinged to the outer wall of the slider.

[0009] Preferably, one end of the elastic member A is fixedly connected to the outer wall of the round rod, and the other end of the elastic member A is fixedly connected to the inner wall of the fixed block A. The round rod is slidably connected in the inner wall of the fixed block A, and the round rod is clamped in the circular groove.

[0010] Preferably, a square groove is provided on the outer wall of the movable rod, a sleeve is fixedly connected to the inner wall of the adjustment channel, the inner wall of the sleeve is elastically connected to the rotating shaft through a spiral spring, the outer wall of the rotating shaft is fixedly connected to a baffle, the outer wall of the bottom end of the movable rod is fixedly connected to a block, and a limiting component is provided on the outer wall of the top end of the adjustment channel.

[0011] Preferably, the adjusting channel is fixedly connected to the outer wall of the valve body, the moving rod passes through the top outer wall of the adjusting channel, one end of the volute spring is fixedly connected to the outer wall of the rotating shaft, the other end of the volute spring is fixedly connected to the inner wall of the sleeve, the rotating shaft is rotatably connected in the inner wall of the sleeve, and the block is in contact with the baffle.

[0012] Preferably, the limiting assembly includes a fixed block B, the inner wall of the fixed block B is elastically connected to a wedge block through an elastic member B, the fixed block B is fixedly connected to the top outer wall of the adjustment channel, one end of the elastic member B is fixedly connected to the outer wall of the wedge block, and the other end of the elastic member B is fixedly connected to the inner wall of the fixed block B, the wedge block is slidably connected to the inner wall of the fixed block B, and the wedge block is clamped in the square groove.

[0013] Preferably, the inner wall of the mounting block is elastically connected to the insert block via a reset spring, the inner wall of the mounting block is slidably connected to the trapezoidal block, the outer wall of the trapezoidal block is slidably connected to the slide rod, and the outer wall of the valve core is provided with a slot.

[0014] Preferably, the mounting block is fixedly connected to the top outer wall of the valve body, the movable ring is fixedly connected to the outer wall of the trapezoidal block, and the sliding rod is fixedly connected to the insert block.

[0015] Preferably, one end of the return spring is fixedly connected to the outer wall of the insert block, the other end of the return spring is fixedly connected to the inner wall of the mounting block, the insert block is slidingly connected to the inner wall of the mounting block, and the insert block is snap-fitted to the slot.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention cooperates with structures such as connecting plates and sliders. When the round rod is pulled and the ring is moved, the hinged rod can be flipped to drive multiple groups of sliders to move synchronously toward the middle or outside. The positions of the bolt holes on the sliders are adjusted so that the bolt holes on the sliders are adjusted to correspond to the positions of the bolt holes on the external pipe flanges. The device can be connected and fixed to the external pipes by positioning bolts. Therefore, even if the bolt holes on the external pipe flanges are at different positions, the device can be adjusted and installed through the connecting mechanism, which has high adaptability.

[0018] The present invention cooperates with structures such as a baffle and a movable rod, and by moving the movable rod up and down, the position of the baffle can be adjusted, thereby adjusting the flip angle of the baffle, and further adjusting the flow rate of the power plant drainage, which is simple to operate and relatively flexible.

[0019] The present invention cooperates with the structures such as the mounting block and the plug block. When disassembling and installing the valve core, the movable ring can be moved downward to drive the plug block to move into the inner wall of the mounting block, so that the valve core can be disassembled and installed. The valve core can be fixed by engaging the plug block with the slot. There is no need to disassemble and install the valve core by turning the bolts multiple times, which is more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the exploded structure of the connecting mechanism, regulating mechanism, valve body, and valve core of the present invention;

[0022] Figure 3 This is a schematic diagram of the exploded structure of the connecting pipe, circular ring section, and connecting plate of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the adjustment channel and sleeve after decomposition of the present invention;

[0024] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of part A;

[0025] Figure 6 This is a schematic diagram of the structure of the mounting block, movable ring cross section, and valve core after decomposition of the present invention.

[0026] In the figure: 1. valve body; 2. connecting mechanism; 201. connecting plate; 202. slide groove; 203. guide groove; 204. connecting pipe; 205. circular groove; 206. circular ring; 207. fixed block A; 208. elastic part A; 209. round rod; 210. hinged rod; 211. slider; 212. guide block; 3. adjusting mechanism; 31. adjusting channel; 32. moving rod; 33. square groove; 34. sleeve; 35. rotating shaft; 36. volute spring; 37. baffle; 38. block; 301. fixed block B; 302. elastic part B; 303. wedge block; 4. fixing mechanism; 41. mounting block; 42. moving ring; 43. trapezoidal block; 44. slide rod; 45. plug-in block; 46. return spring; 47. slot; 5. valve core. DETAILED DESCRIPTION

[0027] 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.

[0028] like Figures 1 to 6 As shown, the present invention provides a device for preventing river water backflow in a power plant, comprising a valve body 1, and further comprising: an adjusting mechanism 3, which is arranged on the outer wall of the valve body 1; a connecting mechanism 2, which is provided with two groups, one group of connecting mechanisms 2 is arranged on the outer wall of the adjusting mechanism 3, and the other group of connecting mechanisms 2 is arranged on the outer wall of the valve body 1; a valve core 5, which is arranged in the inner wall of the valve body 1 through a fixing mechanism 4;

[0029] Among them, the connecting mechanism 2 includes a connecting plate 201, and the outer wall of the connecting plate 201 is slidably connected to a slider 211; the adjusting mechanism 3 includes an adjusting channel 31, and the inner wall of the adjusting channel 31 is slidably connected to a moving rod 32; the fixing mechanism 4 includes a mounting block 41, and the outer wall of the mounting block 41 is slidably connected to a moving ring 42.

[0030] Adopting the above scheme: valve body 1 is the main body of the check valve used to prevent river water from flowing back in the power plant pipeline. Its two ends can be connected to the power plant pipeline. The connecting mechanism 2 can be fixed to the power plant pipeline flange by bolts. Among the two sets of connecting mechanisms 2, one set of connecting pipes 204 is fixedly connected to the outer wall of the regulating channel 31, and the other set of connecting pipes 204 is fixedly connected to the outer wall of the valve body 1. The connecting mechanism 2, the regulating mechanism 3, and the valve body 1 are in a connected state. Figure 1As shown, water from the power plant can flow in from the left connecting mechanism 2, have its flow rate adjusted by the regulating mechanism 3, and then flow out from another set of connecting mechanisms 2 to the river through the valve body 1. When the river water flows back, when it flows in from the right connecting mechanism 2, the check valve will prevent the river water from flowing back, so as to avoid backflow into the power plant and affecting the equipment.

[0031] like Figure 3 As shown, the outer wall of the connecting plate 201 is provided with a sliding groove 202, the outer wall of the connecting plate 201 is provided with a guide groove 203, the outer wall of the connecting plate 201 is fixedly connected to the connecting tube 204, the outer wall of the connecting tube 204 is provided with a circular groove 205, the outer wall of the connecting tube 204 is slidably connected to the circular ring 206, the slider 211 is hinged to the outer wall of the circular ring 206 through the hinge rod 210, the outer wall of the slider 211 is fixedly connected to the guide block 212, the outer wall of the circular ring 206 is fixedly connected to the fixed block A207, and the inner wall of the fixed block A207 is elastically connected to the circular rod 209 through the elastic member A208.

[0032] The above scheme is adopted: multiple groups of slide grooves 202, guide grooves 203 and sliders 211 are provided, and the positions of the slide grooves 202 and the sliders 211 correspond to each other. Bolt holes are provided on the slider 211, and the position of the slider 211 can be adjusted to correspond to the position of the bolt holes of the external pipe flange and installed, thereby avoiding the problem of being unable to install due to the different positions of the bolt holes of the external pipe flange and the flange on the valve body 1; when the slider 211 moves, the bolt holes on its outer wall always correspond to the slide grooves 202, and the bolts can be inserted into the bolt holes and connected to the external pipe flange through the slide grooves 202; the ring 206 can move laterally on the outer wall of the connecting pipe 204 but cannot rotate, and there are multiple groups of circular grooves 205. Under normal circumstances, the elastic member A208 keeps the round rod 209 popped out and engaged with a group of circular grooves 205 due to the elastic force, thereby fixing the position of the ring 206.

[0033] like Figure 3 As shown, the guide block 212 is slidably connected to the inner wall of the guide groove 203, one end of the hinged rod 210 is hinged to the outer wall of the ring 206, and the other end of the hinged rod 210 is hinged to the outer wall of the slider 211; one end of the elastic member A208 is fixedly connected to the outer wall of the round rod 209, and the other end of the elastic member A208 is fixedly connected to the inner wall of the fixed block A207, the round rod 209 is slidably connected in the inner wall of the fixed block A207, and the round rod 209 is clamped with the circular groove 205.

[0034] The above solution is adopted: when the position of the slider 211 needs to be adjusted, the round rod 209 can be pulled upward to compress the elastic member A208 and disengage it from the circular groove 205, thereby releasing the limit of the ring 206 and moving it along the outer wall of the connecting tube 204; when moving, the ring 206 will drive one end of the hinged rod 210 to move synchronously, and the other end of the hinged rod 210 will drive the slider 211 to move. Since the guide block 212 is always in contact with the inner wall of the guide groove 203, the multiple groups of sliders 211 can be moved synchronously under the action of the guide. When the slider 211 is adjusted to correspond to the position of the external pipe bolt hole, the round rod 209 can be loosened, and the elastic member A208 pops out and engages with the circular groove 205 under the elastic force of the elastic member A208, thereby completing the fixation of the position of the circular ring 206, and then fixing the position of the hinge rod 210 and the slider 211; since there are multiple groups of circular grooves 205, the slider 211 can be adjusted to multiple positions for fixation, thereby improving the adaptability and convenience of installation.

[0035] like Figures 4 and 5 As shown, a square groove 33 is provided on the outer wall of the moving rod 32, a sleeve 34 is fixedly connected to the inner wall of the adjusting channel 31, the inner wall of the sleeve 34 is elastically connected to the rotating shaft 35 through a spiral spring 36, the outer wall of the rotating shaft 35 is fixedly connected to a baffle 37, the bottom outer wall of the moving rod 32 is fixedly connected to a stop block 38, and a limiting component is provided on the top outer wall of the adjusting channel 31.

[0036] The above scheme is adopted: the moving rod 32 can move up and down in the inner wall of the regulating channel 31, and its position is fixed by the limit assembly; when there is no water flowing through, the rotating shaft 35 and the baffle 37 maintain a certain position under the elastic force of the spiral spring 36, and the baffle 37 closes the connection between the connecting pipe 204 and the regulating channel 31, so that water cannot flow back from the right to the left, thereby playing a double anti-backflow effect when the valve body 1 fails; when the water flows from the left to the right, due to the large impact force of the water flow, the baffle 37 will be pushed open, causing the rotating shaft 35 and the baffle 37 to flip upward, and when the baffle 37 flips, it contacts the block 38 and is restricted and cannot rotate anymore, thereby fixing the opening size of the connection between the connecting pipe 204 and the regulating channel 31, and then adjusting the flow rate of the power plant drainage.

[0037] like Figures 4 and 5 As shown, the regulating channel 31 is fixedly connected to the outer wall of the valve body 1, the moving rod 32 passes through the top outer wall of the regulating channel 31, one end of the spiral spring 36 is fixedly connected to the outer wall of the rotating shaft 35, and the other end of the spiral spring 36 is fixedly connected to the inner wall of the sleeve 34, the rotating shaft 35 is rotatably connected in the inner wall of the sleeve 34, and the block 38 is in contact with the baffle 37.

[0038] By adopting the above solution, when the baffle 37 flips, the block 38 will limit its flipping range, and when the position of the movable rod 32 is adjusted up and down, the position of the block 38 can be adjusted synchronously, and the flipping range of the baffle 37 can be adjusted, thereby adjusting the flow rate of the power plant drainage.

[0039] like Figures 4 and 5 As shown, the limiting assembly includes a fixed block B301, the inner wall of the fixed block B301 is elastically connected to the wedge block 303 through the elastic member B302, the fixed block B301 is fixedly connected to the top outer wall of the adjustment channel 31, one end of the elastic member B302 is fixedly connected to the outer wall of the wedge block 303, and the other end of the elastic member B302 is fixedly connected to the inner wall of the fixed block B301, the wedge block 303 is slidably connected to the inner wall of the fixed block B301, and the wedge block 303 is clamped with the square groove 33.

[0040] The above solution is adopted: the arc surface of the wedge block 303 is always facing downward, and a shift block is provided on its top surface, which penetrates the outer wall of the fixed block B301. The shift block can be moved to drive the wedge block 303 to move; when the moving rod 32 is pulled upward, the inner wall of the square groove 33 will generate pressure on the arc surface of the wedge block 303, so that the wedge block 303 moves toward the inner wall of the fixed block B301, and the moving rod 32 can be directly pulled upward. At this time, the stop block 38 moves upward synchronously, and the flip range of the baffle 37 becomes larger; when the moving rod 32 needs to be moved upward, the stop block 38 moves upward synchronously, and the flip range of the baffle 37 becomes larger. When 32 moves downward, the operator needs to manually move the dial block to move the wedge block 303 to the inner wall of the fixed block B301 and disengage from the square groove 33, so that the moving rod 32 can be released from the limit and moved downward; when it moves to the appropriate position, the wedge block 303 pops out under the elastic force of the elastic part B302 and engages with the square groove 33 to complete the fixation of the moving rod 32; there are multiple groups of square grooves 33, which can adjust the moving rod 32 to multiple positions for fixation, thereby adjusting the water flow to multiple appropriate flow rate states.

[0041] like Figure 6 As shown, the inner wall of the mounting block 41 is elastically connected to the insert block 45 via a return spring 46, the inner wall of the mounting block 41 is slidably connected to the trapezoidal block 43, the outer wall of the trapezoidal block 43 is slidably connected to the slide rod 44, and the outer wall of the valve core 5 is provided with a slot 47.

[0042] The above scheme is adopted: two groups of plug blocks 45, return springs 46, slide rods 44 and trapezoidal blocks 43 are each provided, symmetrically distributed on the inner walls on both sides of the mounting block 41, and the two groups of trapezoidal blocks 43 are fixedly connected to the inner wall of the movable ring 42, and when the movable ring 42 moves up and down, it can drive the trapezoidal blocks 43 to move synchronously; under normal circumstances, the return spring 46 keeps the plug block 45 in a certain position due to the elastic force, and the plug block 45 drives the slide rod 44 to maintain contact with the long side inclined surface of the trapezoidal block 43 and is in a pop-up state. When the valve core 5 is inserted into the valve body 1, the plug block 45 will engage with the slot 47 to fix the valve core 5.

[0043] like Figure 6 As shown, the mounting block 41 is fixedly connected to the top outer wall of the valve body 1, the movable ring 42 is fixedly connected to the outer wall of the trapezoidal block 43, and the slide rod 44 is fixedly connected to the plug block 45; one end of the return spring 46 is fixedly connected to the outer wall of the plug block 45, and the other end of the return spring 46 is fixedly connected to the inner wall of the mounting block 41, the plug block 45 is slidably connected to the inner wall of the mounting block 41, and the plug block 45 is snap-fitted into the slot 47.

[0044] The above scheme is adopted: when the operator needs to remove the valve core 5 for maintenance or replacement, the operating personnel can manually move the moving ring 42 downward, driving the trapezoidal block 43 to move downward synchronously. The inclined surface of the trapezoidal block 43 affects the slide bar 44 and moves. Since the slide bar 44 can only move horizontally in the inner wall of the mounting block 41, it will drive the corresponding plug block 45 to move to both sides at the same time, so that it is out of contact with the slot 47, and the limit of the valve core 5 can be released to remove it; when installing the valve core 5, it is also necessary to move the moving ring 42 downward to move the plug block 45 to the inner wall of the mounting block 41 and insert the valve core 5 into the valve body 1. When the plug block 45 corresponds to the position of the slot 47, the moving ring 42 can be loosened. Under the elastic force of the return spring 46, the plug block 45 pops out and is stuck in the slot 47, and the valve core 5 is fixed. There is no need to disassemble and install by turning the bolts, which is more convenient.

[0045] The working principle and use process of the present invention:

[0046] When the power plant pipeline is draining, water flows in from the left connecting mechanism 2, and after the flow rate is adjusted by the regulating mechanism 3, it is discharged from the right connecting mechanism 2 to the river through the check valve body 1. At this time, the valve core 5 of the valve body 1 opens under the action of the water flow pressure, allowing forward drainage; the baffle 37 of the regulating mechanism 3 flips under the impact of the water flow, and the flipping range is limited by the block 38 to control the drainage flow rate; when the river water level rises or the pressure reverses, the river water flows back from the right connecting mechanism 2, and the valve core 5 of the valve body 1 automatically closes to prevent the river water from flowing back; at the same time, the baffle 37 of the regulating mechanism 3 is reset under the action of the volute spring 36, closing the connection between the connecting pipe 204 and the regulating channel 31, forming a double anti-backflow protection.

[0047] When the device is installed on the power plant pipeline, the position of the slider 211 can be adjusted first according to the position of the flange bolt hole on the pipeline; the operator can pull the round rod 209 upwards, compress the elastic part A208, so that the round rod 209 is disengaged from the circular groove 205, release the limit of the ring 206, and push the ring 206 to slide on the outer wall of the connecting pipe 204, and drive multiple groups of sliders 211 to move synchronously through the hinge rod 210. During movement, the threaded holes of the sliders 211 always correspond to the position of the slide groove 202; after the slider 211 is adjusted to the position where the threaded holes on its surface correspond to the bolt holes of the external pipeline flange, the round rod 209 is released, and the elastic part A208 pushes the round rod 209 to fit into the circular groove 205, fixing the position of the slider 211; since there are multiple groups of circular grooves 205, multi-level adjustment of the slider 211 can be achieved to adapt to the bolt hole spacing of different pipeline flanges.

[0048] When the power plant is draining water and the drainage flow rate needs to be adjusted, if the flow rate needs to be increased to improve the drainage efficiency, the operator can pull the movable rod 32 upwards, and the square groove 33 squeezes the arc surface of the wedge block 303, so that the wedge block 303 is temporarily retracted into the fixed block B301, the block 38 moves upwards, and the flipping range of the baffle 37 is increased; if the flow rate needs to be reduced, the wedge block 303 can be manually moved to release the engagement with the square groove 33, and the movable rod 32 can be moved downwards. After releasing the block, the wedge block 303 is reset and locked, thereby reducing the flipping range of the baffle 37, which is more flexible.

[0049] After long-term use, when the valve core 5 needs to be disassembled for maintenance or replacement, the movable ring 42 can be manually moved downward to drive the trapezoidal block 43 to move downward synchronously. The inclined surface of the trapezoidal block 43 drives the slide rod 44 and the plug block 45 to move to both sides, so that the plug block 45 is disengaged from the slot 47. After the limit is released, the valve core 5 can be taken out from the valve body 1; when installing the valve core 5, the movable ring 42 is also moved downward to retract the plug block 45 into the installation block 41, and the valve core 5 is inserted into the designated position of the valve body 1. The plug block 45 pops out and is stuck in the slot 47 to complete the fixation. There is no need to disassemble and install it by turning the bolts, which is more convenient and quick.

[0050] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for preventing river water backflow in a power plant, comprising a valve body (1), characterized in that: Also includes: an adjusting mechanism (3), wherein the adjusting mechanism (3) is arranged on the outer wall of the valve body (1); A connecting mechanism (2), wherein the connecting mechanism (2) is provided in two groups, one group of the connecting mechanism (2) is provided on the outer wall of the regulating mechanism (3), and the other group of the connecting mechanism (2) is provided on the outer wall of the valve body (1); A valve core (5), the valve core (5) being arranged in the inner wall of the valve body (1) via a fixing mechanism (4); The connecting mechanism (2) comprises a connecting plate (201), and the outer wall of the connecting plate (201) is slidably connected to a slider (211); The adjustment mechanism (3) comprises an adjustment channel (31), and the inner wall of the adjustment channel (31) is slidably connected to a moving rod (32); The fixing mechanism (4) comprises a mounting block (41), and the outer wall of the mounting block (41) is slidably connected to a moving ring (42).

2. The device for preventing river water backflow in a power plant according to claim 1, characterized in that: The outer wall of the connecting plate (201) is provided with a sliding groove (202), the outer wall of the connecting plate (201) is provided with a guide groove (203), the outer wall of the connecting plate (201) is fixedly connected to a connecting tube (204), the outer wall of the connecting tube (204) is provided with a circular groove (205), the outer wall of the connecting tube (204) is slidably connected to a circular ring (206), the slider (211) is hinged to the outer wall of the circular ring (206) through a hinge rod (210), the outer wall of the slider (211) is fixedly connected to a guide block (212), the outer wall of the circular ring (206) is fixedly connected to a fixed block A (207), and the inner wall of the fixed block A (207) is elastically connected to a circular rod (209) through an elastic member A (208).

3. The device for preventing river water backflow in a power plant according to claim 2, characterized in that: The guide block (212) is slidably connected to the inner wall of the guide groove (203), one end of the hinge rod (210) is hinged to the outer wall of the ring (206), and the other end of the hinge rod (210) is hinged to the outer wall of the slider (211).

4. The device for preventing river water backflow in a power plant according to claim 2, characterized in that: One end of the elastic member A (208) is fixedly connected to the outer wall of the round rod (209), and the other end of the elastic member A (208) is fixedly connected to the inner wall of the fixed block A (207). The round rod (209) is slidably connected to the inner wall of the fixed block A (207), and the round rod (209) is clamped with the circular groove (205).

5. The power plant river water backflow prevention device according to claim 1, characterized in that: The outer wall of the movable rod (32) is provided with a square groove (33), the inner wall of the adjusting channel (31) is fixedly connected with a sleeve (34), the inner wall of the sleeve (34) is elastically connected with a rotating shaft (35) via a volute spring (36), the outer wall of the rotating shaft (35) is fixedly connected with a baffle (37), the outer wall of the bottom end of the movable rod (32) is fixedly connected with a stopper (38), and the outer wall of the top end of the adjusting channel (31) is provided with a limiting assembly.

6. The device for preventing river water backflow in a power plant according to claim 5, characterized in that: The regulating channel (31) is fixedly connected to the outer wall of the valve body (1), the moving rod (32) passes through the top outer wall of the regulating channel (31), one end of the volute spring (36) is fixedly connected to the outer wall of the rotating shaft (35), the other end of the volute spring (36) is fixedly connected to the inner wall of the sleeve (34), the rotating shaft (35) is rotatably connected to the inner wall of the sleeve (34), and the block (38) is in contact with the baffle (37).

7. The device for preventing river water backflow in a power plant according to claim 5, characterized in that: The limiting assembly includes a fixed block B (301), the inner wall of the fixed block B (301) is elastically connected to a wedge block (303) through an elastic member B (302), the fixed block B (301) is fixedly connected to the top outer wall of the adjustment channel (31), one end of the elastic member B (302) is fixedly connected to the outer wall of the wedge block (303), and the other end of the elastic member B (302) is fixedly connected to the inner wall of the fixed block B (301), the wedge block (303) is slidably connected to the inner wall of the fixed block B (301), and the wedge block (303) is clamped with the square groove (33).

8. The device for preventing river water backflow in a power plant according to claim 1, characterized in that: The inner wall of the mounting block (41) is elastically connected to an insert block (45) via a return spring (46), the inner wall of the mounting block (41) is slidably connected to a trapezoidal block (43), the outer wall of the trapezoidal block (43) is slidably connected to a slide rod (44), and the outer wall of the valve core (5) is provided with a slot (47).

9. The power plant river water backflow prevention device according to claim 8, characterized in that: The mounting block (41) is fixedly connected to the top outer wall of the valve body (1), the moving ring (42) is fixedly connected to the outer wall of the trapezoidal block (43), and the sliding rod (44) is fixedly connected to the insert block (45).

10. The device for preventing river water backflow in a power plant according to claim 8, characterized in that: One end of the return spring (46) is fixedly connected to the outer wall of the insert block (45), and the other end of the return spring (46) is fixedly connected to the inner wall of the mounting block (41). The insert block (45) is slidably connected to the inner wall of the mounting block (41), and the insert block (45) is snap-fitted to the slot (47).

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