CN213576201U - Low-temperature welding sealing tool for surge chamber of hydropower station - Google Patents
Low-temperature welding sealing tool for surge chamber of hydropower station Download PDFInfo
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- CN213576201U CN213576201U CN202022420196.3U CN202022420196U CN213576201U CN 213576201 U CN213576201 U CN 213576201U CN 202022420196 U CN202022420196 U CN 202022420196U CN 213576201 U CN213576201 U CN 213576201U
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Abstract
The utility model discloses a sealed frock of power station surge-chamber low temperature welding belongs to power station metallic structure technical field. Comprises a sealing blocking plate and a plurality of L-shaped lacing wires; the lower surface of the sealing blocking plate is provided with an annular groove, and a sealing water stopping device is arranged in the annular groove; one end of the L-shaped lacing wire is fixedly connected with the sealing blocking plate, and the other end of the L-shaped lacing wire is in braze welding connection with the pressure regulating chamber; the sealing water-stopping device is in close contact with the pipe orifice of the middle connecting pipe in the pressure regulating chamber in the circumferential direction. The L-shaped lacing wire is respectively connected with the sealing blocking plate and the pressure regulating chamber, and the generated pulling force compresses the sealing water stopping device, so that the sealing water stopping device is in close contact with the circumferential direction of the pipe orifice of the middle connecting pipe, and good sealing is realized. The L-shaped lacing wire and the pressure regulating chamber are connected by brazing, so that the welding temperature is low, the strength of the pressure regulating chamber for tempering the high-strength steel plate is not influenced while the connection strength is met, and the subsequent operation safety risk is reduced; and simple structure, reasonable in design, the installation and the dismantlement of being convenient for, welding pollution is little.
Description
Technical Field
The utility model belongs to the technical field of power station metal structure, a sealed frock of power station surge-chamber low temperature welding is related to.
Background
In the initial design stage of the water diversion power generation type hydropower station, in order to improve the water hammer phenomenon in the pressure steel pipe, an air cushion type pressure regulating chamber is usually designed and built at the joint of a pressure diversion tunnel or a pressure diversion pipe and a pressure pipeline so as to improve the influence of the water hammer on the vibration of a unit. The air cushion type pressure regulating chamber is large in size, the pressure of a gas and liquid mixed medium is borne inside the air cushion type pressure regulating chamber during working, a pressure maintaining test of water pressure and air pressure needs to be carried out after the construction of the pressure regulating chamber is finished, the test pressure is generally 1.25 times of the rated pressure, the pressure maintaining test can be communicated with a main pressure steel pipe through a middle connecting pipe of the pressure regulating chamber after the pressure maintaining test is accepted, and the air cushion type pressure regulating chamber is put into a power station to operate and use.
The air cushion type pressure regulating chamber is arranged in parallel to the longitudinal axis direction of the pressure pipeline, and the central line of the pressure regulating chamber is positioned on the middle flat section of the pressure pipeline. The pressure regulating chamber is of a steel plate welding structure, an upstream welding choke plug and a downstream welding choke plug form a closed space, and the closed space is connected with the pressure steel pipe through a connecting pipe positioned in the middle. At present, all pressure regulating chamber air chamber steel pipes are made of 07MnMoVR quenched and tempered high-strength steel, welt branch pipes are reinforced by 07MnMoVR quenched and tempered high-strength steel, a joint section of an intermediate connecting pipe close to a telescopic joint is made of Q345R steel, and other positions are made of 07MnMoVR quenched and tempered high-strength steel.
The hydraulic test is carried out under the condition that the main air chamber is communicated with the connecting pipe, and the premise is that air chambers on two sides of the middle flat section must form a closed space. Since the main air chamber is in communication with the connecting pipe, a method must be provided for closing the space between the main air chamber and the connecting pipe. The air chamber and the connecting pipe are mostly in a 07MnMoVR quenched and tempered high-strength steel plate welding structure, and the conventional welding on the surface of the air chamber and the connecting pipe is not allowed to be carried out for ensuring the strength requirement of the quenched and tempered high-strength steel plate according to the GB50766-2012 standard requirement. Although the purpose of sealing the air chamber of the pressure regulating chamber can be achieved by the aid of the choke plug of the conventional welding structure, the inner wall steel plate of the air chamber can be damaged by welding and disassembling, secondary heat treatment of the high-strength steel plate can be caused by high temperature generated by welding and gouging, the strength of the steel plate is reduced, water leakage and air leakage risks exist in the air chamber operation process, and the safety and stability operation of a unit is influenced.
Disclosure of Invention
In order to solve the problem, an object of the utility model is to provide a sealed frock of power station surge-chamber low temperature welding under the condition that does not influence the high-strength steel plate intensity of barochamber quenching and tempering, the space between sealed surge-chamber main air chamber and the connecting pipe makes the surge-chamber form airtight space, satisfies air cushion type surge-chamber hydrostatic test requirement.
The utility model discloses a realize through following technical scheme:
the utility model discloses a low-temperature welding sealing tool for a hydropower station surge chamber, which comprises a sealing closure plate and a plurality of L-shaped lacing wires; the lower surface of the sealing blocking plate is provided with an annular groove, and a sealing water stopping device is arranged in the annular groove; one end of the L-shaped lacing wire is fixedly connected with the sealing blocking plate, and the other end of the L-shaped lacing wire is in braze welding connection with the pressure regulating chamber; the sealing water-stopping device is in close contact with the pipe orifice of the middle connecting pipe in the pressure regulating chamber in the circumferential direction.
Preferably, the lower surface of the sealing blocking plate is fixedly connected with a plurality of second tensioning lugs, the inner wall of the middle connecting pipe expansion joint is fixedly connected with a plurality of first tensioning lugs, and the first tensioning lugs and the second tensioning lugs are connected through a guy cable device.
Further preferably, a plurality of second tensioning lifting lugs are uniformly distributed on the lower surface of the sealing blocking plate.
Preferably, the upper surface of the sealing closure plate is fixedly connected with a plurality of reinforcing ribs.
Further preferably, a plurality of reinforcing ribs are uniformly distributed in a grid mode.
Preferably, the edge of the annular groove is provided with a chamfer.
Preferably, the L-shaped lacing wires are uniformly distributed on the periphery of the sealing and plugging plate.
Further preferably, the number of the L-shaped lacing wires is 12-24.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a sealed frock of power station surge-chamber low temperature welding because the material of surge-chamber and intermediate junction pipe is quenching and tempering high strength steel board, according to relevant standard and standard requirement, does not allow to carry out conventional welding, consequently adopts L type lacing wire to be connected with sealed closure plate and surge-chamber respectively, and the pulling force of production compresses tightly sealed watertight fittings, makes the mouth of pipe circumference in close contact with of sealed watertight fittings and intermediate junction pipe to realize the good sealing of surge-chamber. The L-shaped lacing wire and the pressure regulating chamber are connected by brazing, so that the welding temperature is low, the strength of the pressure regulating chamber for tempering the high-strength steel plate is not influenced while the connection strength is met, and the subsequent operation safety risk is reduced; and simple structure, reasonable in design, the installation and the dismantlement of being convenient for, welding pollution is little.
Furthermore, the middle connecting pipe expansion joint is made of low alloy steel, the weldability is good, the first tensioning lifting lug and the inner wall of the middle connecting pipe expansion joint are fixed, and then the first tensioning lifting lug and the second tensioning lifting lug are connected through a guy cable device, so that the positioning and tensioning during installation are facilitated, and the sealing effect can be improved; meanwhile, when the individual L-shaped lacing wire fails, the tool can be prevented from failing, and the safety and the stability are improved.
Furthermore, a plurality of second tensioning lifting lugs are uniformly distributed on the lower surface of the sealing blocking plate, so that the tension of the inhaul cable device can be uniformly applied to the whole lower surface of the sealing blocking plate, the compression amount of each part of the sealing water stopping device is basically equal, and the sealing performance is improved.
Further, the rigidity of the sealing plate can be increased by the reinforcing ribs, and deformation during a hydrostatic test is avoided.
Furthermore, the grid-type uniform distribution structure of the reinforcing ribs can uniformly act on the whole upper surface of the sealing blocking plate, and the sealing blocking plate is uniform in stress and good in effect.
Further, annular groove edge is equipped with the chamfer, avoids causing the damage to sealed watertight fittings, influences sealed effect.
Furthermore, the L-shaped lacing wires are uniformly distributed on the periphery of the sealing and plugging plate, so that the tensioning force can be uniformly applied to the periphery of the sealing and water-stopping device, the compression amount is uniform, and the sealing is reliable.
Furthermore, the number of the L-shaped lacing wires is 12-24, so that the strength of the tensioning force can be ensured.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the upper surface of the sealing plate;
fig. 3 is a schematic structural view of the lower surface of the sealing closure plate.
In the figure, 1 is sealed closure plate, 2 is first taut lug, 3 is the annular groove, 4 is sealed stagnant water device, 5 is the taut lug of second, 6 is the cable device, 7 is the strengthening rib, 8 is the surge-chamber, 9 is the intermediate junction pipe, 10 is L type lacing wire.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
as shown in fig. 1, the utility model discloses a low-temperature welding and sealing tool for a hydropower station surge chamber, which comprises a sealing closure plate 1 and a plurality of L-shaped tie bars 10; the lower surface of the sealing blocking plate 1 is provided with an annular groove 3, and a sealing water stopping device 4 is arranged in the annular groove 3; one end of the L-shaped lacing wire 10 is fixedly connected with the sealing blocking plate 1, and the other end of the L-shaped lacing wire is connected with the pressure regulating chamber 8 in a brazing mode; the sealing water-stopping device 4 is closely contacted with the pipe orifice circumference of the middle connecting pipe 9 in the pressure adjusting chamber 8.
The utility model discloses a better embodiment, the lower fixed surface of sealed closure plate 1 is connected with a plurality of taut lugs 5 of second, and the inner wall fixedly connected with a plurality of taut lugs 2 of the 9 telescopic joints of intermediate junction pipe, first taut lug 2 and the taut lug 5 of second pass through cable device 6 and connect, and cable device 6 can adopt chain block. Preferably, a plurality of second tensioning lugs 5 are uniformly distributed on the lower surface of the sealing closure plate 1, as shown in fig. 3, an arrangement form of 4 second tensioning lugs 5 arranged in a matrix may be adopted.
Referring to fig. 2, in a preferred embodiment of the present invention, a plurality of reinforcing ribs 7 are fixedly connected to the upper surface of the sealing closure plate 1, and preferably, the plurality of reinforcing ribs 7 are uniformly distributed in a grid manner.
In a preferred embodiment of the present invention, the edge of the annular groove 3 is chamfered.
Referring to fig. 3, in a preferred embodiment of the present invention, 12 to 24L-shaped tie bars 10 are uniformly distributed on the periphery of the sealing plate 1.
The mounting method of the low-temperature welding sealing tool for the pressure regulating chamber of the hydropower station comprises the following steps:
step 1: uniformly fixing a plurality of first tensioning lifting lugs 2 on the inner wall of an expansion joint of a middle connecting pipe 9 in a circumferential direction, placing a sealing blocking plate 1 at the pipe orifice of the middle connecting pipe 9 in a pressure regulating chamber 8, enabling the center of the sealing blocking plate 1 to be superposed with the axis of the middle connecting pipe 9, and cleaning the contact surface of a sealing water stopping device 4; the two ends of the guy cable device 6 are respectively connected with the first tensioning lifting lug 2 and the second tensioning lifting lug 5, the tension of the guy cable device 6 is adjusted until the sealing water-stopping device 4 reaches a preset compression amount, and the compression amount of the sealing water-stopping device 4 is generally 20% -30%;
step 2: polishing two ends of a plurality of L-shaped lacing wires 10, then distributing the L-shaped lacing wires on the periphery of the sealing and plugging plate 1, and welding all the L-shaped lacing wires 10 and the sealing and plugging plate 1 by adopting manual electric arc welding, wherein the welding current is 100-120A, and the electric arc voltage is 20-21V;
and step 3: the sealing water-stopping device 4 is arranged in the annular groove 3, and the sealing blocking plate 1 is positioned;
and 4, step 4: and (3) brazing the L-shaped lacing wire 10 and the steel plate of the surge chamber 8 by adopting S-Sn40Pb58Sb tin-lead brazing filler metal, wherein the welding temperature is controlled to be 183-235 ℃.
The selection and installation of the low-temperature welding sealing tool for the hydropower station surge chamber of the utility model are further explained by a specific embodiment as follows:
1) the sealing closure plate 1 is made of a Q345R steel plate, and has the following dimensions: (diameter x thickness): 4000 x 60 mm. And the sealing blocking plate 1 is subjected to chamfering, polishing and smooth transition from the outer edge of the annular groove 3 to the outer edge of the sealing blocking plate 1. The surface roughness is required to be not less than Ra12.5.
2) The edge of the reinforcing rib 7 is provided with a single V groove which is welded with the upper surface of the sealing closure plate 1 in a # -shaped manner, and the horizontal distance is 800 mm.
3) The processing of 1 lower surface of sealed closure plate is used for assembling annular groove 3 of sealed watertight fittings 4, the size of annular groove 3: (inner diameter width depth) 3200.22.5 41 mm.
4) And a sealing water stopping device 4 is assembled at the annular groove 3. Sealed watertight fittings 4 adopt wear-resisting butadiene-acrylonitrile rubber to make, and sealed watertight fittings 4 and 4 cooperation assemblies of sealed recess guarantee that sealed compression ratio is: 1:1.25.
5) And four second tensioning lifting lugs 5 are welded on the lower surface of the sealing closure plate 1.
6) The first tensioning lifting lug 2 is welded on the inner wall of the part, made of the material Q345R, of the middle connecting pipe 9, the middle connecting pipe is connected with the second tensioning lifting lug 5 through the guy cable device 6, and the middle connecting pipe is tensioned through the guy cable device 6, so that the sealing water stopping device 4 is in close contact with the inner wall of the air cushion type pressure regulating chamber to play a role in sealing.
7) The outer circle of the sealing blocking plate 1 is divided into 12 areas, 12L-shaped lacing wires 10 are welded, the L-shaped lacing wires 10 and the upper surface of the sealing blocking plate 1 are welded through manual electric arc welding by adopting phi 3.2mm E5015 welding rods, the welding current is 100-120A, and the electric arc voltage is 20-21V; the contact part of the L-shaped lacing wire 10 and the steel plate of the surge chamber 8 is brazed by adopting S-Sn40Pb58Sb tin-lead solder, and the welding temperature is controlled to be 183-235 ℃.
It should be noted that the above description is only one of the embodiments of the present invention, and all equivalent changes made by the system described in the present invention are included in the protection scope of the present invention. The technical field of the present invention can be replaced by other embodiments described in a similar manner, without departing from the structure of the present invention or exceeding the scope defined by the claims, which belong to the protection scope of the present invention.
Claims (8)
1. A low-temperature welding sealing tool for a hydropower station surge chamber is characterized by comprising a sealing closure plate (1) and a plurality of L-shaped lacing wires (10); the lower surface of the sealing blocking plate (1) is provided with an annular groove (3), and a sealing water stopping device (4) is arranged in the annular groove (3); one end of the L-shaped tie bar (10) is fixedly connected with the sealing closure plate (1), and the other end is connected with the pressure regulating chamber (8) in a brazing mode; the sealing water-stopping device (4) is tightly contacted with the pipe orifice circumference of the middle connecting pipe (9) in the pressure regulating chamber (8).
2. The low-temperature welding sealing tool for the pressure regulating chamber of the hydropower station according to claim 1, wherein a plurality of second tensioning lugs (5) are fixedly connected to the lower surface of the sealing blocking plate (1), a plurality of first tensioning lugs (2) are fixedly connected to the inner wall of the expansion joint of the intermediate connecting pipe (9), and the first tensioning lugs (2) and the second tensioning lugs (5) are connected through a guy cable device (6).
3. The low-temperature welding sealing tool for the pressure regulating chamber of the hydropower station according to claim 2, wherein a plurality of second tensioning lifting lugs (5) are uniformly distributed on the lower surface of the sealing closure plate (1).
4. The low-temperature welding sealing tool for the pressure regulating chamber of the hydropower station according to claim 1, wherein a plurality of reinforcing ribs (7) are fixedly connected to the upper surface of the sealing closure plate (1).
5. The low-temperature welding and sealing tool for the pressure regulating chamber of the hydropower station according to claim 3, wherein a plurality of reinforcing ribs (7) are uniformly distributed in a grid manner.
6. The hydropower station surge chamber low-temperature welding sealing tool as claimed in claim 1, wherein a chamfer is arranged at the edge of the annular groove (3).
7. The low-temperature welding sealing tool for the pressure regulating chamber of the hydropower station according to claim 1, wherein the L-shaped tie bars (10) are uniformly distributed on the periphery of the sealing closure plate (1).
8. The hydropower station surge chamber low-temperature welding sealing tool according to claim 7, wherein the number of the L-shaped tie bars (10) is 12-24.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022420196.3U CN213576201U (en) | 2020-10-27 | 2020-10-27 | Low-temperature welding sealing tool for surge chamber of hydropower station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022420196.3U CN213576201U (en) | 2020-10-27 | 2020-10-27 | Low-temperature welding sealing tool for surge chamber of hydropower station |
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| Publication Number | Publication Date |
|---|---|
| CN213576201U true CN213576201U (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022420196.3U Active CN213576201U (en) | 2020-10-27 | 2020-10-27 | Low-temperature welding sealing tool for surge chamber of hydropower station |
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| Country | Link |
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| CN (1) | CN213576201U (en) |
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- 2020-10-27 CN CN202022420196.3U patent/CN213576201U/en active Active
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