CN110984090B - Drainage energy dissipation station based on hydraulic system tail end - Google Patents
Drainage energy dissipation station based on hydraulic system tail end Download PDFInfo
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- CN110984090B CN110984090B CN201911417045.8A CN201911417045A CN110984090B CN 110984090 B CN110984090 B CN 110984090B CN 201911417045 A CN201911417045 A CN 201911417045A CN 110984090 B CN110984090 B CN 110984090B
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- 230000021715 photosynthesis, light harvesting Effects 0.000 title claims abstract description 115
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000010865 sewage Substances 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims description 85
- 238000011010 flushing procedure Methods 0.000 claims description 25
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
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Abstract
The invention discloses a drainage energy dissipation station based on the tail end of a water conservancy system; the water tank comprises a tank body and a discharge valve, wherein the tank body is formed by pouring concrete, the tank body adopts a square structure, the upper part of one vertical side surface is provided with a water inlet communicated with an upper water source, the water outlet is arranged on the other vertical side surface, the bottom of the tank body is provided with a concrete base for installing a submerged discharge valve, and the upper surface of the base is pre-embedded with a foundation valve seat; triangular energy dissipation blocks are arranged around the tank body, and energy dissipation slopes are arranged on the upper surface and the lower surface of the triangular energy dissipation blocks; a sewage discharge pipe communicated with the bottom end of the tank body; the relief valve is vertically installed in the energy dissipation tank. By adopting the technical scheme, the submerged energy dissipation station can be formed by the submerged energy dissipation station and the discharge valve, so that high kinetic energy jet is effectively prevented from being ejected from the discharge valve, the downward leakage rapid flow is changed into slow flow, and the kinetic energy of the downward leakage water flow can be eliminated by more than 80%.
Description
Technical Field
The invention belongs to the technical field of energy dissipation tanks of water conservancy systems, and particularly relates to a drainage energy dissipation station based on the tail end of a water conservancy system.
Background
With the rapid development of high dam construction in China, the problems of high water head, large flow flood discharge and energy dissipation are extremely focused research subjects in the water conservancy project community. An energy dissipating pond, also called a stilling pond, promotes the creation of underflow hydraulic energy dissipating facilities downstream of the spillway building. The absorption basin can change the downward leakage rapid flow into the slow flow, generally can eliminate the kinetic energy of the downward leakage water flow by 40% -70%, can shorten the length of the guard period, and is an effective and economic energy dissipation facility.
Typically, the energy dissipating reservoir is used in combination with a relief valve to form a submerged energy dissipating station that is typically installed at the end of a piping system for regulating the water intake of a reservoir or the water flow at the end of a dam or pipeline. Compared with other terminal discharge valves, the valve has the main advantages that the valve is combined with an energy dissipation tank with a compact structure, so that the kinetic energy of a pipeline medium is eliminated stably, and a relatively stable post-valve leakage flow is provided. When the common valve works in a small opening throttle state, cavitation is easy to occur due to high-speed jet injection; when the submerged energy dissipation and discharge valve works, high-speed jet is sprayed into a water pool around the valve, and implosion of cavitation bubbles occurs in the water pool far away from the valve and the pipeline, so that cavitation cannot be damaged; the existing energy dissipation tank generally adopts a traditional energy dissipation tank structure, so that the diversion energy dissipation atomization is serious; the traditional underflow energy dissipation atomization is lower, but the water flow is concentrated, the jet flow near-bottom flow velocity is high, and the impact resistance and protection difficulty of the bottom plate are high; the water flow connection condition of the surface flow is difficult to control, the surface wave influence is far, and the downstream river bank is not beneficial to the anti-impact protection. Therefore, the problems of concentrated underflow energy dissipation water flow, high bottoming flow rate, stability of the bottom plate of the stilling pool and the like become engineering difficulties. The example of the damage of the water discharge building caused by the high-speed water flow of flood discharge is frequent, and the damage of different degrees of the water discharge building with nearly 1/3 of the water conservancy and hydropower engineering is counted, the damage of the protection structure of the downstream stilling pool is the most common form, the flood discharge and energy dissipation safety problem is quite remarkable, and the water conservancy and hydropower engineering is one of the control factors of the design and operation safety of the water conservancy and hydropower engineering.
The areas of the energy dissipation tank and the bleeder valve are relatively large, the height of the energy dissipation tank is about 15m from the bottommost part (paved concrete) of the energy dissipation tank to the topmost part of the operating mechanism, and the outside of the energy dissipation tank is 10m multiplied by 9m; designing the discharge flow to be 12 cubic meters per second, and enabling the energy dissipation water head to reach 90m; the valve main body caliber DN1600 is about 12.5m in height and the weight is close to 30t, so that the stability of the installation is also important in the design and construction process.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides the drainage energy dissipation station based on the tail end of the water conservancy system, which has the advantages of reasonable structure, easiness in construction and good energy dissipation effect.
The invention is realized in such a way that the energy dissipation station for discharging based on the tail end of the water conservancy system comprises a submerged energy dissipation tank arranged at the tail end of the water conservancy system and a discharge valve arranged in the energy dissipation tank; the relief valve is vertically arranged in the energy dissipation tank; the relief valve includes the valve body and installs the valve rod in the valve body, installs the sleeve floodgate in the valve pocket of valve body, spoke support connection valve rod's in the sleeve floodgate lower extreme, the up end in energy dissipation pond is extended to the upper end of valve rod, the drive arrangement of drive valve rod drive sleeve floodgate up-and-down motion, its characterized in that is installed to the upper end of valve rod: the energy dissipation tank comprises a tank body formed by pouring concrete, wherein the tank body adopts a square structure, the upper part of one vertical side surface is provided with a water inlet communicated with an upper water source, the water outlet is arranged on the other vertical side surface, the bottom of the tank body is provided with a concrete base for installing a relief valve, and the upper surface of the base is pre-embedded with a foundation valve seat; triangular energy dissipation blocks are arranged around the tank body, 45-degree energy dissipation slopes are arranged on the upper surface and the lower surface of the triangular energy dissipation blocks, and the upper edges of the triangular energy dissipation blocks are flush with the lower edge of the water outlet; the upper surface of the tank body is provided with a relief valve mounting hole, and a relief valve supporting plate is arranged on the relief valve mounting hole; the bottom of the tank body is provided with a sewage discharge port communicated with sewage treatment; the valve body comprises a lower valve body connected with a basic valve seat, a flow regulating spray pipe is fixedly arranged on the upper end face of the lower valve body, a middle valve body is fixedly arranged on the upper end face of the flow regulating spray pipe, a first sealing component is arranged on the matching face of the flow regulating spray pipe and the middle valve body, a second sealing component is arranged on the matching face of the flow regulating spray pipe and the lower valve body, an upper valve body is fixedly arranged on the upper end face of the middle valve body, and the upper end part of the upper valve body is fixedly connected with a diversion elbow; one side of the lower valve body is connected with a sewage drain pipe, and the sewage drain pipe penetrates through a sewage discharge port of the energy dissipation tank to be communicated with a sewage well; a manhole for overhauling and dredging is arranged on the side wall of the lower valve body at a position avoiding the sewage drain pipe, and a manhole cover is hermetically arranged on the end face of the manhole; the upper valve body adopts a reducing structure, and the inner diameter of the end of the connecting guide elbow is larger than that of the end of the valve body in connection; the diversion elbow is connected with a water inlet pipe arranged in the water inlet of the energy dissipation tank; a support sleeve is arranged on the guide elbow corresponding to the valve rod position, a sleeve type valve rod bracket is fixedly arranged at the upper end of the support sleeve, and the valve rod bracket is fixedly arranged on the discharge valve supporting plate; the inner part of the guide bent pipe is provided with a guide plate along the bending direction of the guide bent pipe, the guide plate divides the guide bent pipe into an upper guide channel and a lower guide channel, and the height of the upper guide channel is larger than that of the upper guide channel.
The technical scheme is preferable, and the side length of the inner cavity of the triangular energy dissipation tank body is assumed to be S; the distance h between the lower edge of the triangular energy dissipation block and the bottom of the pool is 0.25S; the overall height H of the triangular energy dissipation block is 0.78S; the height S1 of the energy dissipation slope is 0.27S; the water inclined side length of the triangular energy dissipation block is 0.414S.
According to the technical scheme, the foundation valve seat is formed by integrally casting and comprises a relief valve mounting plate, a foundation connecting plate is arranged at the bottom of the relief valve mounting plate, and embedded bolts are arranged on the foundation connecting plate along the circumferential direction; the lower surface of bleeder valve mounting panel is equipped with the concrete and holds the chamber, holds the intracavity at the concrete and is equipped with spoke form gusset, the equipartition is equipped with the through-hole that allows the concrete grouting material to pass through on the gusset.
According to the technical scheme, the first sealing assembly comprises a sealing ring, the upper surface of the sealing ring is provided with a sealing compression ring, and the sealing compression ring is installed in a sealing groove at the upper end of the flow-regulating spray pipe through a fastening bolt; the inner side surface of the sealing ring is in sealing fit with the outer circumferential surface of the sleeve brake, and a height adjusting screw is arranged on the sealing compression ring along the circumferential direction at a position avoiding the fastening bolt.
In the above technical scheme, preferably, three sealing bands are arranged on the inner circumferential surface of the sealing ring at intervals, and two inner elastic deformation spaces are formed between the three sealing bands; the outer circumference of the sealing ring is provided with two sealing belts extending obliquely upwards, the two sealing belts are respectively positioned at the upper end and the lower end of the sealing ring, and the two sealing belts and the upper plane and the lower plane of the sealing ring form an inclined angle of 8-10 degrees; an external elastic deformation space is formed between the two sealing strips.
The technical scheme is that the valve rod is of a split structure and at least comprises two valve rod monomers, and the adjacent valve rod monomers are connected by a coupler; the valve rod monomer at the upper part passes through the diversion elbow corresponding to the valve rod position.
In the above technical scheme, preferably, a torque member for preventing the valve rod from rotating is fixedly installed on the valve rod in the valve rod bracket, and a guide groove consistent with the movement direction of the valve rod is formed in the valve rod bracket at the position corresponding to the boss at the position corresponding to the torque member; the length of the guide groove is longer than the length of the valve rod stroke; the torque member comprises two semicircular torque plates which are symmetrically arranged and are connected through fastening bolts, a boss is arranged on the outer side of each torque plate, and the width of the boss is equal to that of the guide groove; the boss is inserted in the guide groove; the rotary mounting groove is formed in the valve rod, a key groove is formed in the rotary mounting groove, and a key matched with the key groove is embedded into the inner surface of one of the torque plates of the torque member.
According to the technical scheme, preferably, a spoke type guide frame integrated with the middle valve body is arranged in the middle valve body, and a guide sleeve for penetrating the valve rod is arranged in the center of the guide frame; a valve rod guide disc is arranged between the middle valve body and the upper valve body and between the upper valve body and the flange connecting disc between the guide bent pipe, a spoke type rib plate is arranged in the valve rod guide disc, and the spoke type rib plate is connected with a guide sleeve in the center of the valve rod guide disc; four lateral brackets are fixedly arranged on the side face of the middle valve body along the circumferential direction, and the other end of each lateral bracket is fixedly connected with a pre-buried connecting seat pre-buried on the inner side face of the energy dissipation tank.
The technical scheme is that the flow-regulating spray pipe comprises a barrel, wherein flanges are arranged at two ends of the barrel; the side wall of the cylinder body is provided with a plurality of rows of overflow holes; the same row of overflow holes are divided into a throttling area, an overflow area and a blowdown flushing area from the following description, the throttling area is positioned at the side of the lower valve body, a plurality of main regulation overflow holes with the same aperture are arranged on the overflow area, a plurality of blowdown flushing overflow holes are arranged on the blowdown flushing area, and the aperture of the blowdown flushing overflow hole is larger than that of the main regulation overflow hole of the main regulation overflow area; the throttling area is provided with a plurality of throttling and overflowing holes, and the aperture of each throttling and overflowing hole is smaller than that of the corresponding overflowing hole.
The technical scheme is preferable and comprises a cylinder, wherein flanges are arranged at two ends of the cylinder; a plurality of flow through grooves are formed in the side wall of the cylinder along the height direction of the cylinder; the overflow groove is divided into a throttling area, an overflow area and a sewage draining flushing area from bottom to top; the length ratio of the throttling area to the overflow area to the sewage flushing area is 1:2:1, the width of the overflow groove gradually increases from the throttling area to the pollution discharge flushing area.
The invention has the advantages and technical effects that: the submerged energy dissipation station is formed by the energy dissipation pool and the discharge valve, a triangular energy dissipation block with an energy dissipation slope is arranged in the energy dissipation pool to dissipate energy, so that high kinetic energy jet flow is effectively prevented from being ejected from the discharge valve, the downward leakage rapid flow is changed into slow flow, more than 80% of kinetic energy of the downward leakage water flow can be eliminated, and then the downward leakage water flow slowly flows out from the water outlet; the relief valve has the advantages of firm installation, stable operation, safety, reliability, good sealing performance, high flow regulating precision and the like.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic illustration of the dimensional specification labeling structure of the present invention;
FIG. 3 is a schematic diagram of the construction of the energy dissipating tank;
FIGS. 4 and 5 are schematic views of a basic valve seat structure;
FIG. 6 is a schematic view of a bleed valve construction;
FIG. 7 is a schematic view of the internal structure of the bleeder valve;
FIG. 8 is a schematic view of a sleeve brake structure;
FIGS. 9a and 9b are schematic views of the structure of the flow regulating nozzle;
FIG. 10 is a schematic diagram of a slotted flow regulating nozzle;
FIG. 11 is a schematic view of the valve stem pilot disc construction;
FIG. 12 is an enlarged view of section I of FIG. 7;
FIG. 13 is an enlarged view of section II of FIG. 7;
FIG. 14 is a schematic view of a torque member mounting structure;
FIG. 15 is a schematic view of a partial construction of a valve stem;
FIG. 16 is a reference graph of a energy dissipating cell design;
FIG. 17 is a graph of flow system percentage versus valve opening for the present invention.
In the figure, 10, an energy dissipation tank; 101. a water inlet; 102. a water outlet; 103. a base; 104. a base valve seat; 114. a bleed valve mounting plate; 124. a base connection board; 134. embedding bolts; 144. a concrete accommodating chamber; 154. spoke-shaped rib plates; 164. a through hole; 105. triangular energy dissipation blocks; 106. a relief valve mounting hole; 107. a relief valve support plate; 108. a sewage discharge port; 20. a relief valve; 210. a valve body; 211. a lower valve body; 212. a middle valve body; 2121. spoke type guide frame; 2122. a guide sleeve; 213. a first seal assembly; 2131. a seal ring; 2132. sealing compression rings; 2133. sealing grooves; 2134. an adjusting screw; 214. a second seal assembly; 215. an upper valve body; 216. a diversion elbow; 217. a sewage drain pipe; 218. a manhole; 219. a manhole cover; 220. a valve stem; 2201 support sleeve; 2202. a valve stem bracket; 221. a valve stem monomer; 222. a coupling; 223. a rotary installation groove; 224. a key slot; 230. a sleeve gate; 231. a boss; 232. a guide ring; 233. a spoke support; 234. a deflector; 240. a flow regulating spray pipe; 241. a cylinder; 242. a flange plate; 2420. a throttle zone; 2421. a flow passage area; 2422. a sewage disposal flushing area; 2423. a main regulating overflow hole; 2424. flushing the overflow hole by sewage discharge; 2425. a throttle flow orifice; 2426. a flow trough; 250. a driving device; 260. a torque member; 261. a guide groove; 262. a torque plate; 263. a boss; 264. a key; 270. a valve stem guide disc; 271. spoke type rib plate; 272. a guide sleeve; 280. a bracket; 290. embedding a connecting seat; 30. a water inlet pipe.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 17, a drainage energy dissipation station based on the end of a hydraulic system comprises a submerged energy dissipation tank 10 arranged at the end of the hydraulic system and a drainage valve 20 arranged in the energy dissipation tank; the relief valve is vertically arranged in the energy dissipation tank; the relief valve 20 comprises a valve body 210 and a valve rod 220 arranged in the valve body, wherein a sleeve brake 230 is arranged in a valve cavity of the valve body, and the sleeve brake is made of stainless steel; the spoke support 233 in the sleeve brake is connected with the lower end of the valve rod, the upper end of the valve rod extends out of the upper end face of the energy dissipation tank, the upper end of the valve rod is provided with a driving device 250 for driving the valve rod to drive the sleeve brake to move up and down, the energy dissipation tank comprises a tank body formed by casting concrete, the tank body adopts a square structure, the upper part of one vertical side face is provided with a water inlet 101 communicated with an upper water source, the water outlet 102 is arranged on the other vertical side face, the bottom of the tank body is provided with a concrete base 103 for installing a relief valve, and the upper surface of the base is pre-embedded with a base valve seat 104; triangular energy dissipation blocks 105 are arranged around the tank body, 45-degree energy dissipation slopes are arranged on the upper surface and the lower surface of the triangular energy dissipation blocks, and the upper edges of the triangular energy dissipation blocks are level with the lower edge of the water outlet; the triangular energy dissipation blocks with energy dissipation slopes are arranged in the energy dissipation pool to dissipate energy, so that high kinetic energy jet is effectively prevented from being ejected from the relief valve, and the downward leakage rapid flow is changed into slow flow; the upper surface of the tank body is provided with a relief valve mounting hole 106, and a relief valve supporting plate 107 is arranged on the relief valve mounting hole; the bottom of the tank body is provided with a sewage discharge port 108 communicated with sewage treatment; the valve body 210 comprises a lower valve body 211 connected with a basic valve seat, a flow regulating spray pipe 240 is fixedly arranged on the upper end surface of the lower valve body, a middle valve body 212 is fixedly arranged on the upper end surface of the flow regulating spray pipe, a first sealing component 213 is arranged on the matching surface of the flow regulating spray pipe and the middle valve body, and a second sealing component 214 is arranged on the matching surface of the flow regulating spray pipe and the lower valve body; The boss 231 with the height of 2mm is processed at the lower part of the sleeve gate, so that the contact area is reduced and the opening and closing torque is reduced when the sleeve gate slides on the flow-regulating spray pipe to be opened or closed; meanwhile, the boss is precisely matched with the flow-regulating spray pipe, and the upper part of the sleeve gate is precisely matched with a guide ring 232 arranged above the flow-regulating spray pipe to form an upper guide ring and a lower guide ring; the working stroke of the precisely-guided sleeve brake is stable and reliable; an upper valve body 215 is fixedly arranged on the upper end surface of the middle valve body, and the upper end part of the upper valve body is fixedly connected with a diversion elbow 216; one side of the lower valve body is connected with a sewage drain pipe 217 which passes through a sewage discharge port of the energy dissipation tank to be communicated with a sewage well; a manhole 218 for overhauling and dredging is arranged on the side wall of the lower valve body at a position avoiding the sewage drain pipe, and a manhole cover 219 is hermetically arranged on the end surface of the manhole; the upper valve body 215 adopts a reducing structure, and the inner diameter of the connecting diversion elbow end is larger than that of the valve body end in connection; the diversion elbow is connected with a water inlet pipe 30 arranged in the water inlet of the energy dissipation tank; a support sleeve 2201 is arranged on the flow guide elbow corresponding to the valve rod position, a sleeve type valve rod bracket 2202 is fixedly arranged at the upper end of the support sleeve, and a packing seal box is arranged between the actual assembly type support sleeve and the valve rod; the valve stem bracket is fixedly mounted on the relief valve support plate 107; The guide plate 234 is arranged in the guide bent pipe along the bending direction of the guide bent pipe, the guide plate divides the guide bent pipe into an upper guide channel and a lower guide channel, and the height of the upper guide channel is larger than that of the upper guide channel.
Referring to a design reference graph of the energy dissipation tank in the construction of the energy dissipation tank, please refer to fig. 16, assuming that the side length of the inner cavity of the triangular energy dissipation tank body is S; the side length S of the inner cavity of the triangular energy dissipation tank body is calculated and tabulated by adopting the following calculation formula:
q: maximum discharge amount m 3/s (given by design)
H: maximum head m before valve (design given)
D: minimum depth m of energy dissipation pool
S: energy dissipation Chi Bianchang m
Calculating the side length of the energy dissipation pool, and then determining the sizes of the triangular energy dissipation blocks; wherein the distance h between the lower edge of the triangular energy dissipation block and the bottom of the pool is 0.25S; the overall height H of the triangular energy dissipation block is 0.78S; the height S1 of the energy dissipation slope is 0.27S; the water inclined side length of the triangular energy dissipation block is 0.414S.
In the above technical solution, the base valve seat 104 is integrally cast and includes a relief valve mounting plate 114, a base connecting plate 124 is disposed at the bottom of the relief valve mounting plate, and embedded bolts 134 are disposed on the base connecting plate along the circumferential direction; the lower surface of bleeder valve mounting panel is equipped with concrete and holds the chamber 144, is equipped with spoke form gusset 154 in the concrete and holds the intracavity, the equipartition is equipped with the through-hole 164 that allows the concrete grouting material to pass through on the gusset. The stability of bleeder valve installation has been guaranteed, and the foundation disk seat is pour in the bottom of the pool of energy dissipation pond an organic whole, and the bottom of foundation disk seat adopts the spoke formula support additional strengthening that link up moreover, does benefit to pouring concrete grouting material and passes through, guarantees foundation base installation's fastness.
In the above technical solution, preferably, the first sealing assembly 213 includes a sealing ring 2131, the upper surface of the sealing ring is provided with a sealing compression ring 2132, and the sealing compression ring is installed in a sealing groove 2133 at the upper end of the flow regulating nozzle by a fastening bolt; the inner side of the sealing ring is in sealing fit with the outer circumferential surface of the sleeve brake, a height adjusting screw 2134 is arranged on the sealing compression ring at a position avoiding the fastening bolt along the circumferential direction, and the compression deformation of the sealing ring can be adjusted through the height adjusting screw, so that the effective deformation can be ensured to achieve an ideal sealing effect. In the above technical scheme, preferably, three sealing bands are arranged on the inner circumferential surface of the sealing ring at intervals, and two inner elastic deformation spaces are formed between the three sealing bands; the outer circumference of the sealing ring is provided with two sealing belts extending obliquely upwards, the two sealing belts are respectively positioned at the upper end and the lower end of the sealing ring, and the two sealing belts and the upper plane and the lower plane of the sealing ring form an inclined angle of 8-10 degrees; an external elastic deformation space is formed between the two sealing strips. When in initial sealing, the sealing compression ring is locked, the outer side of the sealing ring is compressed, the inner side of the sealing ring is extruded inwards, and the three sealing belts are extruded towards the sleeve gate to form three seals. When the sealing surface is worn, the adjusting flange is locked again, and the inner side of the sealing ring is extruded inwards, so that the worn sealing quantity is compensated. The sealing ring with the design has the advantages of large adjustment compensation amount, reasonable sealing specific pressure and different sealing amounts of the three sealing belts, and can ensure sealing even if the sleeve gate is slightly inclined.
The above technical scheme is preferable, the sealing ring of the second sealing component adopts a 'convex' sealing ring.
Preferably, the valve rod 220 adopts a split structure, at least comprises two valve rod units 221, and adjacent valve rod units are connected by a coupler 222; corresponding to the valve rod position, the valve rod monomer at the upper part passes through the diversion elbow, and the intensity of the valve rod is ensured by adopting split processing due to the higher relief valve.
In the above technical solution, preferably, a torque member 260 for preventing the valve rod from rotating is fixedly installed on the valve rod in the valve rod bracket, and a guide groove 261 consistent with the movement direction of the valve rod is provided on the valve rod bracket at the position corresponding to the boss corresponding to the position of the torque member; the length of the guide groove is longer than the length of the valve rod stroke; the torque member comprises two semicircular torque plates 262 which are symmetrically arranged and are connected through fastening bolts, a boss 263 is arranged on the outer side of each torque plate, and the width of the boss is equal to that of the guide groove; the boss is inserted in the guide groove; the valve rod is provided with a rotary mounting groove 223, a key groove 224 is arranged in the rotary mounting groove, and a key 264 matched with the key groove is embedded on the inner surface of one of the torque plates of the torque member. The torque component moves in the guide groove in the opening and closing process of the valve, and is restrained in the circumferential direction, so that the valve rod can only move up and down and cannot rotate, the problem that the sliding sleeve starts to fail or cannot reach the expected opening or closing stroke due to the rotation of the sliding sleeve along with the valve rod is solved, and the service performance of the valve is guaranteed.
In the above preferred embodiment, a spoke type guide frame 2121 integrated with the middle valve body is disposed in the middle valve body 212, and a guide sleeve 2122 for threading the valve rod is disposed in the center of the guide frame; a valve rod guide disc 270 is arranged between the middle valve body and the upper valve body and between the upper valve body and the flange connecting disc between the diversion bent pipe, a spoke type rib plate 271 is arranged in the valve rod guide disc, and the spoke type rib plate is connected with a guide sleeve 272 in the center of the valve rod guide disc; four lateral brackets 280 are fixedly arranged on the side surface of the middle valve body along the circumferential direction, and the other end of each lateral bracket is fixedly connected with a pre-buried connecting seat 290 pre-buried on the inner side surface of the energy dissipation tank. The adoption of the wheel type guide frame structure ensures the supporting strength of the valve rod and ensures the valve rod to stably run up and down;
In the above technical solution, the flow-regulating nozzle 240 includes a cylinder 241, and flanges 242 are disposed at two ends of the cylinder; the side wall of the cylinder body is provided with a plurality of rows of overflow holes; the same row of overflow holes are divided into a throttling area 2420, an overflow area 2421 and a blowdown flushing area 2422 from the following description, the throttling area is positioned on the side of the lower valve body, a plurality of main regulation overflow holes 2423 with the same aperture are arranged on the overflow area, a plurality of blowdown flushing overflow holes 2424 are arranged on the blowdown flushing area, and the aperture of the blowdown flushing overflow hole is larger than that of the main regulation overflow hole of the main regulation overflow area; the throttling area is provided with a plurality of throttling flow holes 2425, and the aperture of the throttling flow holes is smaller than that of the flow holes in the flow area.
Preferably, in the above technical solution, the flow-regulating nozzle 240 includes a cylinder, and flanges are disposed at two ends of the cylinder; a plurality of flow-through grooves 2426 are arranged on the side wall of the cylinder along the height direction of the cylinder; the overflow groove is divided into a throttling area, an overflow area and a sewage draining flushing area from bottom to top; the length ratio of the throttling area to the overflow area to the sewage flushing area is 1:2:1, the width of the overflow groove gradually increases from the throttling area to the pollution discharge flushing area.
The flow-regulating spray pipes are distributed with spray holes or grooves; the size, shape and distribution of the spray holes or grooves are specially designed based on different working conditions. Compared with the traditional valve adopting uniformly distributed overflow holes, the flow regulating spray pipe in the technical scheme has the advantages that the flow regulating precision is high when the valve is opened in a throttling zone (small opening), the symmetrically distributed overflow holes are used for energy dissipation through opposite flushing, the valve is small in vibration and low in noise, and cavitation is controlled in a medium in the center of a pipeline through opposite flushing and spraying, so that the valve is protected; when the valve is opened in the flow-through region, the flow-regulating characteristic curve approaches to linear regulation, see fig. 17. The medium in the valve is directly sprayed into the energy dissipation tank through the sleeve, and the kinetic energy of the medium is fully dissipated in water; the valve has the advantages of large flow regulation range, rapid and stable energy dissipation, stable full-stroke operation of the valve, and no influence of vibration and cavitation. When the valve is fully opened, the large hole at the tail end of the sleeve is opened, so that the flow regulating range can be further increased, large particle impurity dirt deposited in front of the valve can be flushed away, the valve opening and closing part is cleaned, and the service life of the valve is prolonged.
In summary, the submerged energy dissipation station is formed by the energy dissipation pool and the discharge valve, the triangular energy dissipation blocks with energy dissipation slopes are arranged in the energy dissipation pool to dissipate energy, so that high-kinetic energy jet flow is effectively prevented from being ejected from the discharge valve, the downward leakage rapid flow is changed into slow flow, more than 80% of kinetic energy of the downward leakage water flow can be eliminated, and then the downward leakage water flow slowly flows out from the water outlet; the relief valve has the advantages of firm installation, stable operation, safety, reliability, good sealing performance, high flow regulating precision and the like.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. A drainage energy dissipation station based on the tail end of a water conservancy system comprises a submerged energy dissipation tank arranged at the tail end of the water conservancy system and a drainage valve arranged in the energy dissipation tank; the relief valve is vertically arranged in the energy dissipation tank; the relief valve includes the valve body and installs the valve rod in the valve body, installs the sleeve floodgate in the valve pocket of valve body, spoke support connection valve rod's in the sleeve floodgate lower extreme, the up end in energy dissipation pond is extended to the upper end of valve rod, the drive arrangement of drive valve rod drive sleeve floodgate up-and-down motion, its characterized in that is installed to the upper end of valve rod: the energy dissipation tank comprises a tank body formed by pouring concrete, wherein the tank body adopts a square structure, the upper part of one vertical side surface is provided with a water inlet communicated with an upper water source, the water outlet is arranged on the other vertical side surface, the bottom of the tank body is provided with a concrete base for installing a relief valve, and the upper surface of the base is pre-embedded with a foundation valve seat; triangular energy dissipation blocks are arranged around the tank body, 45-degree energy dissipation slopes are arranged on the upper surface and the lower surface of the triangular energy dissipation blocks, and the upper edges of the triangular energy dissipation blocks are flush with the lower edge of the water outlet; the upper surface of the tank body is provided with a relief valve mounting hole, and a relief valve supporting plate is arranged on the relief valve mounting hole; the bottom of the tank body is provided with a sewage discharge port communicated with sewage treatment;
The valve body comprises a lower valve body connected with a basic valve seat, a flow regulating spray pipe is fixedly arranged on the upper end face of the lower valve body, a middle valve body is fixedly arranged on the upper end face of the flow regulating spray pipe, a first sealing component is arranged on the matching face of the flow regulating spray pipe and the middle valve body, a second sealing component is arranged on the matching face of the flow regulating spray pipe and the lower valve body, an upper valve body is fixedly arranged on the upper end face of the middle valve body, and the upper end part of the upper valve body is fixedly connected with a diversion elbow; one side of the lower valve body is connected with a sewage drain pipe, and the sewage drain pipe penetrates through a sewage discharge port of the energy dissipation tank to be communicated with a sewage well; a manhole for overhauling and dredging is arranged on the side wall of the lower valve body at a position avoiding the sewage drain pipe, and a manhole cover is hermetically arranged on the end face of the manhole;
The upper valve body adopts a reducing structure, and the inner diameter of the end of the connecting guide elbow is larger than that of the end of the valve body in connection;
The diversion elbow is connected with a water inlet pipe arranged in the water inlet of the energy dissipation tank; a support sleeve is arranged on the guide elbow corresponding to the valve rod position, a sleeve type valve rod bracket is fixedly arranged at the upper end of the support sleeve, and the valve rod bracket is fixedly arranged on the discharge valve supporting plate; a guide plate is arranged in the guide bent pipe along the bending direction of the guide bent pipe, the guide plate divides the guide bent pipe into an upper guide channel and a lower guide channel, and the height of the upper guide channel is larger than that of the upper guide channel;
Assuming that the side length of the inner cavity of the triangular energy dissipation tank body is S; the distance h between the lower edge of the triangular energy dissipation block and the bottom of the pool is 0.25S; the overall height H of the triangular energy dissipation block is 0.78S; the height S1 of the energy dissipation slope is 0.27S; the water inclined side length of the triangular energy dissipation block is 0.414S;
The foundation valve seat is formed by integrally casting and comprises a relief valve mounting plate, a foundation connecting plate is arranged at the bottom of the relief valve mounting plate, and embedded bolts are arranged on the foundation connecting plate along the circumferential direction; the lower surface of bleeder valve mounting panel is equipped with the concrete and holds the chamber, holds the intracavity at the concrete and is equipped with spoke form gusset, the equipartition is equipped with the through-hole that allows the concrete grouting material to pass through on the gusset.
2. The hydraulic system end-based bleeder energy dissipation station of claim 1, wherein: the first sealing assembly comprises a sealing ring, the upper surface of the sealing ring is provided with a sealing compression ring, and the sealing compression ring is installed in a sealing groove at the upper end of the flow-regulating spray pipe through a fastening bolt; the inner side surface of the sealing ring is in sealing fit with the outer circumferential surface of the sleeve brake, and a height adjusting screw is arranged on the sealing compression ring along the circumferential direction at a position avoiding the fastening bolt.
3. The hydraulic system end-based bleeder and energy dissipation station of claim 2, wherein: three sealing belts are arranged on the inner circumferential surface of the sealing ring at intervals, and two inner elastic deformation spaces are formed between the three sealing belts; the outer circumference of the sealing ring is provided with two sealing belts extending obliquely upwards, the two sealing belts are respectively positioned at the upper end and the lower end of the sealing ring, and the two sealing belts and the upper plane and the lower plane of the sealing ring form an inclined angle of 8-10 degrees; an external elastic deformation space is formed between the two sealing strips.
4. The hydraulic system end-based bleeder energy dissipation station of claim 1, wherein: the valve rod adopts a split structure and at least comprises two valve rod monomers, and the adjacent valve rod monomers are connected by a coupler; the valve rod monomer at the upper part passes through the diversion elbow corresponding to the valve rod position.
5. The hydraulic system end-based bleeder energy dissipation station of claim 1, wherein: a torque component for preventing the valve rod from rotating is fixedly arranged on the valve rod in the valve rod bracket, and a guide groove consistent with the movement direction of the valve rod is arranged on the valve rod bracket at the position corresponding to the boss corresponding to the position of the torque component; the length of the guide groove is longer than the length of the valve rod stroke; the torque member comprises two semicircular torque plates which are symmetrically arranged and are connected through fastening bolts, a boss is arranged on the outer side of each torque plate, and the width of the boss is equal to that of the guide groove; the boss is inserted in the guide groove; the rotary mounting groove is formed in the valve rod, a key groove is formed in the rotary mounting groove, and a key matched with the key groove is embedded into the inner surface of one of the torque plates of the torque member.
6. The hydraulic system end-based bleeder energy dissipation station of claim 1, wherein: a spoke type guide frame integrated with the middle valve body is arranged in the middle valve body, and a guide sleeve for penetrating the valve rod is arranged in the center of the guide frame; a valve rod guide disc is arranged between the middle valve body and the upper valve body and between the upper valve body and the flange connecting disc between the guide bent pipe, a spoke type rib plate is arranged in the valve rod guide disc, and the spoke type rib plate is connected with a guide sleeve in the center of the valve rod guide disc; four lateral brackets are fixedly arranged on the side face of the middle valve body along the circumferential direction, and the other end of each lateral bracket is fixedly connected with a pre-buried connecting seat pre-buried on the inner side face of the energy dissipation tank.
7. The hydraulic system end-based bleeder energy dissipation station of claim 1, wherein: the flow-regulating spray pipe comprises a barrel, and flanges are arranged at two ends of the barrel; the side wall of the cylinder body is provided with a plurality of rows of overflow holes; the same row of overflow holes are divided into a throttling area, an overflow area and a blowdown flushing area from the following description, the throttling area is positioned at the side of the lower valve body, a plurality of main regulation overflow holes with the same aperture are arranged on the overflow area, a plurality of blowdown flushing overflow holes are arranged on the blowdown flushing area, and the aperture of the blowdown flushing overflow hole is larger than that of the main regulation overflow hole of the main regulation overflow area; the throttling area is provided with a plurality of throttling and overflowing holes, and the aperture of each throttling and overflowing hole is smaller than that of the corresponding overflowing hole.
8. The hydraulic system end-based bleeder energy dissipation station of claim 1, wherein: the device comprises a cylinder body, wherein flanges are arranged at two ends of the cylinder body; a plurality of flow through grooves are formed in the side wall of the cylinder along the height direction of the cylinder; the overflow groove is divided into a throttling area, an overflow area and a sewage draining flushing area from bottom to top; the length ratio of the throttling area to the overflow area to the sewage flushing area is 1:2:1, the width of the overflow groove gradually increases from the throttling area to the pollution discharge flushing area.
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| US6886595B2 (en) * | 2002-10-04 | 2005-05-03 | Stealth International, Inc. | Bi-directional adjustable energy dissipating and head loss valve |
| CN101270574A (en) * | 2008-04-18 | 2008-09-24 | 北京航空航天大学 | Layered multi-strand non-collision high-efficiency energy dissipation structure for flood discharge of high arch dam body in canyon area |
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