CN110441158B - Water pressure test method for coiled tube heat exchange module - Google Patents
Water pressure test method for coiled tube heat exchange module Download PDFInfo
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Abstract
The invention discloses a hydraulic test method for a coiled tube heat exchange module, which comprises the following steps: step (1): firstly, connecting a high-pressure water pump with a header water inlet pipe, and connecting a hydraulic press with a header exhaust pipe; step (2): starting the high-pressure water pump, quickly filling water into the coiled heat exchange module, stopping the high-pressure water pump after the coiled heat exchange module is filled with water, and plugging a header drain pipe; and (3): starting a hydraulic press to perform pressure boosting and maintaining on the coiled tube heat exchange module, and performing leakage check, wherein no leakage is qualified; and (4): and (3) unloading the pipe orifice end socket, discharging water, then connecting the high-pressure centrifugal fan with a header water inlet pipe of the coiled pipe heat exchange module, starting the high-pressure centrifugal fan, carrying out large-air-volume blowing and draining on the inside of the coiled pipe heat exchange module, and continuously blowing and draining until no water drips at the pipe orifice of the header water drain pipe and no water is accumulated at the bottom of the header, and stopping the high-pressure centrifugal fan. The invention has the advantages that: (1) the water filling time of the hydrostatic test is short, and the production efficiency is high; (2) the accumulated water in the module after the hydrostatic test can be completely drained.
Description
Technical Field
The invention relates to the technical field of hydrostatic tests of energy-saving and emission-reducing heat exchange devices, in particular to a method for hydrostatic tests of a coiled tube heat exchange module.
Background
Energy is used as a material basis for survival and development of human society, is highly valued by all countries in the world, and is not exceptional in China, and particularly in the current new historical development period, energy conservation and emission reduction are inevitable choices for establishing a resource-saving and environment-friendly society for accelerating the pace of ecological civilization construction in China. Energy conservation and emission reduction are long-term strategic guidelines for economic and social development in China and are extremely urgent tasks. The waste heat recovery and energy consumption reduction have important practical significance for realizing energy conservation, emission reduction and environmental protection development strategy in China. Meanwhile, the utilization of waste heat plays an increasingly important role in the aspects of improving labor conditions, saving energy, increasing production, improving product quality, reducing production cost and the like, and some of the waste heat become an integral part in industrial production.
The boiler exhaust heat loss of the power station is one of the main heat losses in the thermal power plant, and the exhaust waste heat utilization system is adopted to reduce the exhaust temperature, so that the economy of the power plant can be greatly improved, and the boiler exhaust heat loss is one of the important ways for improving the heat efficiency of a unit. At present, a plurality of domestic power plants adopt a low-temperature economizer technology to reduce the exhaust gas temperature and improve the economy of the power plants. The heat exchange device assembled by a plurality of coiled pipe heat exchange modules is one of necessary devices of the low-temperature economizer technology, and the advantages and disadvantages of the performance of the coiled pipe heat exchange modules directly influence the electric dust removal efficiency and the effective service life of system equipment. The serpentine heat exchange module used at present generally comprises: the heat exchange system comprises a water inlet header, a water outlet header and a plurality of rows of snakelike heat exchange tubes, wherein the snakelike heat exchange tubes are positioned between the water inlet header and the water outlet header, a header water inlet tube is arranged on the water inlet header, and a header drain tube and a header exhaust tube are arranged on the water outlet header.
The hydrostatic test is one of the most important processes in the manufacturing process of the coiled tube heat exchange module and is used for detecting whether the coiled tube heat exchange module has leakage, can bear pressure after operation, and has obvious defects of welding penetration, welding leakage, cracks and the like of welding seams.
The hydraulic pressure test mainly comprises three steps of irrigation, pressure maintaining and water drainage, wherein during irrigation, a header drain pipe and a header exhaust pipe of the coiled pipe heat exchange module are firstly plugged, then a header water inlet pipe is directly connected to a water source, and after the header water inlet pipe is filled with water, the header water inlet pipe is plugged; during pressure maintaining, the exhaust pipe of the header is connected with a hydraulic press, the hydraulic press is used for boosting and maintaining pressure in the coiled pipe heat exchange module, and whether the coiled pipe heat exchange module leaks or not is checked; when the water is drained, the exhaust pipe of the header is directly opened, so that the water in the coiled heat exchange module naturally flows out.
The existing hydrostatic test has the following defects:
(1) the water filling time of the hydrostatic test is long, and the production efficiency is low;
(2) because of the structural characteristics of the coiled pipe heat exchange module (a coiled pipe and header structure), the elbows of the coiled pipes are welded and butted, and because the pipes are deformed during welding and the horizontal welding of each pipe cannot be guaranteed during factory manufacture, the coiled pipes cannot be completely flat, accumulated water in the module after drainage is ensured, and because the water inlet and the water outlet of the header tank cannot be the lowest point of the module, the drainage is not clean during drainage; the bottom of the header also has accumulated water, the accumulated water in the module can not be completely drained during drainage, and the water in the module can not be thoroughly drained even if the module is repeatedly swung and poured. Accumulated water in the module can corrode the pipe wall and frost crack the pipe, a series of failure hidden dangers can be generated, the service life of the heat exchange device is shortened, and potential safety hazards are buried for production and operation safety of a power plant.
The accumulated water of the hydrostatic test module is difficult in the whole industries such as an economizer, a membrane wall, LGGH and the like, and no water accumulated in the heat exchange module can be completely removed in the domestic industry at present.
Disclosure of Invention
The invention aims to provide a water pressure test method for a coiled heat exchange module, which has short irrigation time and can completely remove accumulated water in the module.
In order to achieve the purpose, the invention adopts the following technical scheme: the hydraulic test method for the coiled pipe heat exchange module comprises the following steps:
step (1): firstly, connecting a high-pressure water pump with a header water inlet pipe of a coiled pipe heat exchange module, and then connecting a hydraulic press with a header exhaust pipe of the coiled pipe heat exchange module;
step (2): starting a high-pressure water pump, quickly filling water into the coiled pipe heat exchange module, and flushing garbage sundries in the coiled pipe heat exchange module; when the coiled pipe heat exchange module is filled with water and the water flowing out of the header drain pipe has no garbage, the high-pressure water pump is stopped; then, plugging the header drain pipe by using a pipe orifice end socket;
and (3): starting a hydraulic press to boost the coiled tube heat exchange module, stopping boosting and carrying out primary leakage check after the pressure in the coiled tube heat exchange module is increased to the working pressure of the module, continuing boosting to the testing pressure of the module after no leakage is ensured, then stopping the hydraulic press, maintaining the pressure for a certain time, carrying out secondary leakage check, then reducing the pressure to the working pressure of the module, carrying out tertiary leakage check, and determining that the product is qualified if no leakage exists;
and (4): and (3) detaching a pipe opening end socket on the header drain pipe, discharging water in the coiled pipe heat exchange module, connecting a high-pressure centrifugal fan with a header water inlet pipe of the coiled pipe heat exchange module, starting the high-pressure centrifugal fan, carrying out large-air-volume blowing and draining on the inside of the coiled pipe heat exchange module, and continuously blowing and stopping the high-pressure centrifugal fan when no water drips at the pipe opening of the header drain pipe and no water is accumulated at the bottom of the header.
Further, the hydraulic test method for the coiled tube heat exchange module comprises the following steps: the high-pressure water pump and the high-pressure centrifugal fan are simultaneously connected with a high-pressure sealing butt joint which is in sealing butt joint with the water inlet pipe of the header through a reversing connecting pipe group, and the reversing connecting pipe group enables the high-pressure sealing butt joint to be only communicated with the high-pressure water pump or only communicated with the high-pressure centrifugal fan.
Further, the hydraulic test method for the coiled tube heat exchange module comprises the following steps: the structure of the reversing connection pipe group comprises: the high-pressure centrifugal fan comprises a water inlet branch pipe connected with an outlet of the high-pressure water pump, an air inlet branch pipe connected with an outlet of the high-pressure centrifugal fan, a connecting main pipe connected with a high-pressure sealing butt joint, and a three-way reversing valve, wherein two inlets of the three-way reversing valve are respectively connected with the water inlet branch pipe and the air inlet branch pipe, and an outlet of the three-way reversing valve is connected with the connecting main pipe.
Further, the hydraulic test method for the coiled tube heat exchange module comprises the following steps: the structure of the high-pressure sealing butt joint comprises: the water-filling device comprises a connecting pipe and a sleeve pipe which are sequentially distributed along the water-filling direction, wherein one end of the pipe ends at two sides of the connecting pipe, which is far away from the sleeve pipe, is a water inlet end, and one end of the pipe ends at two sides of the connecting pipe, which is close to the sleeve pipe, is a water outlet end; a supporting pipe used for communicating the sleeve with the connecting pipe is arranged between the sleeve flange disc and the connecting pipe flange disc, the connecting pipe, the supporting pipe and the sleeve jointly form a water passage, the connecting pipe, the supporting pipe and the sleeve are connected and fixed together through a fastening assembly, a check door is arranged between the spring positioning table and the water outlet end of the connecting pipe, a spring is connected between the check door and the spring positioning table, and the spring enables the check door to always have the tendency of being tightly pressed on the end face of the water outlet end of the connecting pipe; when the water pressure of the pipe connecting side is greater than the sum of the acting force of the spring and the water pressure of the sleeve pipe side, the stop gate can leave the end face of the water outlet end of the pipe connecting under the action of the water pressure of the pipe connecting side, so that the water passing channel is opened, and when the water pressure of the sleeve pipe side is greater than the water pressure of the pipe connecting side, the stop gate can be tightly pressed on the end face of the water outlet end of the pipe connecting under the combined action of the water pressure of the sleeve pipe side and the spring, so that the water passing channel is cut off.
Further, the hydraulic test method for the coiled tube heat exchange module comprises the following steps: the structure of the fixing mechanism comprises: the inner diameter of the water outlet end of the sleeve is larger than that of the water inlet end of the sleeve, so that an annular convex shoulder for the end surface of the water inlet pipe of the header to abut against is formed at the diameter-variable position of the inner wall of the sleeve, and a sealing gasket is arranged on the annular convex shoulder; a hoop binding disc is fixedly sleeved outside the water outlet end of the sleeve, and four corners of the hoop binding disc are respectively provided with a mounting hole which axially penetrates through the hoop binding disc; the water inlet and outlet pipe is characterized by further comprising two U-shaped binding hoops capable of being clamped on the header, the outer end portions of the two side straight sections of each U-shaped binding hoop are threaded sections, the two U-shaped binding hoops correspond to a pair of mounting holes in the upper side and the lower side of the binding hoop disc respectively, each U-shaped binding hoop is clamped on the header through a U-shaped bayonet, the two side straight sections of each U-shaped binding hoop penetrate through the corresponding mounting holes respectively and are in threaded connection with locking nuts, all the locking nuts are screwed, the end face of the water inlet and outlet pipe is pressed on a sealing gasket of an annular convex shoulder in the sleeve, and the water inlet and outlet pipe is connected with the sleeve in the outside in a sealing mode.
Further, the hydraulic test method for the coiled tube heat exchange module comprises the following steps: the structure of the fastening assembly includes: the pipe connecting flange plate is provided with a plurality of first through holes which axially penetrate through the pipe connecting flange plate along the circumferential direction, the pipe connecting flange plate is provided with a plurality of second through holes which axially penetrate through the pipe connecting flange plate along the circumferential direction, the first through holes of the pipe connecting flange plate and the second through holes of the pipe connecting flange plate are in one-to-one correspondence, each pair of corresponding first through holes and second through holes are respectively provided with a fastening bolt in a penetrating way, a screw rod of each fastening bolt penetrates through the corresponding first through holes and second through holes and then is respectively connected with a fastening nut in a threaded way, all the fastening nuts are screwed, the pipe connecting flange plate and the pipe connecting flange plate are in a relative sealing and clamping supporting pipe, and therefore the sleeve pipe, the supporting pipe and the connecting pipe can be detachably connected and fixed together.
Further, the hydraulic test method for the coiled tube heat exchange module comprises the following steps: annular positioning grooves for embedding the stay tubes are respectively arranged on the end faces of the opposite sides of the sleeve flange plate and the pipe connecting flange plate, the pipe ends of the two sides of the stay tubes are respectively embedded into the corresponding annular positioning grooves of the two sides, and a first sealing gasket for sealing a gap between the flange plate and the stay tubes is respectively arranged in each annular positioning groove; and when the check door is tightly pressed on the end face of the water outlet end of the connecting pipe through the second sealing washer, the second sealing washer can seal a gap between the check door and the end face of the water outlet end of the connecting pipe.
Further, the hydraulic test method for the coiled tube heat exchange module comprises the following steps: each spoke rod is provided with a guide pipe which axially extends to the flange of the connecting pipe, all the guide pipes surround the outer side of the stop gate, and all the guide pipes form a guide channel which can ensure that the stop gate accurately moves to the end face of the water outlet end of the connecting pipe.
Further, the hydraulic test method for the coiled tube heat exchange module comprises the following steps: the hydraulic press connects the collection case blast pipe through setting up in the pipe end of its export connecting pipe end is sealed, the structure that the pipe end connects includes: the pressure gauge is arranged at one end of the central tube, the pressure gauge is connected with the central tube through a bypass tube with a check valve, two locking nuts are connected to the central tube through threads, a flexible sleeve and two pushing and pressing shaft sleeves are sequentially and movably sleeved on the central tube between the two locking nuts, a locking and positioning ring is arranged between the two pushing and pressing shaft sleeves and consists of a plurality of independent arc-shaped shaft tiles, an expansion groove convenient for the two ends of each arc-shaped shaft tile to outwards open is arranged on the outer wall of each arc-shaped shaft tile along the circumferential direction, each arc-shaped shaft tile is arranged in a shape that the two ends are thin along the axial direction and the middle is thick, a tapered channel convenient for the pushing and pressing shaft sleeves to push in is formed at the two ends of the locking and positioning ring, when the locking nuts are tightened, the locking nuts can push the two pushing and pressing shaft sleeves into the locking and positioning ring along the tapered channel at the same side, the two ends of each arc-shaped shaft tile of the locking and positioning ring are respectively outwards opened to tightly expand with the inner wall of a tube end, and continuously tightening the locking nut to extrude the flexible sleeve, so that the flexible sleeve expands along the radial direction to seal the gap between the central tube and the inner wall of the tube end.
Further, the hydraulic test method for the coiled tube heat exchange module comprises the following steps: the structure of mouth of pipe head includes: the central screw rod, there is a lock nut at both ends of the central screw rod separately whorl, there are a flexible sleeve and two bulldozing axle sleeves in order to movably cover on the central screw rod between two lock nuts, there are locking locating rings between two bulldozing axle sleeves, the locking locating ring is made up of independent arc shaft tiles of several petals, there are convenient arc shaft tile both ends to open the expanded groove outwards on the outer wall of every petal arc shaft tile along the direction of circumference, every petal arc shaft tile is set up in the shape of being thin and thick in the middle along the axial both ends, make both ends of the locking locating ring form the taper channel that is convenient for bulldozing the axle sleeve to push in, when tightening up the lock nut, the lock nut can push two bulldozing axle sleeves into the locking locating ring along the same side taper channel, make both ends of every petal arc shaft tile of the locking locating ring expand and position with the inner wall of the pipe orifice tightly separately, continue tightening up the lock nut and extrude the flexible sleeve, the flexible sleeve is radially expanded to seal the orifice.
Through the implementation of the technical scheme, the invention has the beneficial effects that:
(1) the water is poured through large water quantity, the water pouring time of the hydrostatic test is short, and the production efficiency is high;
(2) the water in the module after the water pressure test can be completely drained by blowing and draining with large air volume, so that a series of failure hidden dangers such as pipe wall corrosion, pipe frost crack and the like caused by the accumulated water in the module are eliminated, the service life of the heat exchange device is greatly prolonged, and the production and operation safety of a power plant is ensured;
(3) the high-pressure sealing butt joint has the advantages of simple structure, convenience in operation, disassembly and maintenance, time and labor saving, and greatly improves the working efficiency;
(4) the pipe orifice end socket has simple structure, convenient operation, low use cost and good fixing effect with the pipe end; the pressure bearing device can bear higher pressure and has long effective service life; the locking positioning ring can be detached for replacement and maintenance without withdrawing parts such as the locking nut on the central screw, so that the maintenance process is simplified, and the maintenance efficiency is improved.
(5) The pipe end joint has simple structure, good fixing effect with the pipe end and high use stability; the sealing effect between the hydraulic test tube and the tube end is good, the pressure bearing is high, and effective guarantee is provided for the normal operation of a hydraulic test; the expansion pipe has the advantages of convenient operation, long service life, low use cost and convenient disassembly, assembly and maintenance, and particularly, when the expansion pipe is maintained, the expansion pipe can be disassembled for replacement and maintenance without withdrawing parts such as a locking nut on the central pipe, so that the maintenance process is simplified, and the maintenance efficiency is improved; the function is various, can know the inside real-time pressure of coiled pipe heat exchange module through the manometer accurately in real time.
Drawings
Fig. 1 is a schematic view of the use states of a high-pressure water pump, a high-pressure centrifugal fan, a hydraulic press, a high-pressure sealing butt joint, a pipe orifice end socket and a pipe end joint in the water pressure test method of the coiled heat exchange module.
Fig. 2 is a schematic structural view of the high pressure sealing butt joint shown in fig. 1.
Fig. 3 is an enlarged schematic view of a portion H shown in fig. 2.
Fig. 4 is a schematic view of the construction of the sleeve flange shown in the right-hand orientation of fig. 2.
Fig. 5 is a schematic structural view of the high-pressure-tight butt joint and the connection header shown in fig. 2 when they are not assembled.
Fig. 6 is a schematic structural view of the orifice closure shown in fig. 1.
Fig. 7 is a schematic view of the usage state of fig. 6.
Fig. 8 is a schematic view of the structure of the pipe end fitting shown in fig. 1.
Fig. 9 is a schematic view of the use state of fig. 8.
Fig. 10 is a schematic structural view of the center tube shown in fig. 8.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1, the hydraulic test method for the coiled heat exchange module includes a hydraulic test device including a high pressure water pump 1, a high pressure centrifugal fan 2, a high pressure sealing butt joint 4 for sealing and butt-jointing with a header water inlet pipe 31 of the coiled heat exchange module 3, a pipe mouth end socket 5 for sealing and plugging a header water outlet pipe 32 of the coiled heat exchange module 3, and a hydraulic press 6, wherein a pipe end of an outlet connecting pipe 61 of the hydraulic press 6 is provided with a pipe end joint 7 for sealing and butt-jointing with a header exhaust pipe 33 of the coiled heat exchange module 3, the high pressure sealing butt joint 4 is simultaneously connected with the high pressure water pump 1 and the high pressure centrifugal fan 2 through a reversing connecting pipe group, and the reversing connecting pipe group can enable the high pressure sealing butt joint 4 to be communicated with only the high pressure water pump 1 or only with only the high pressure centrifugal fan 2;
in this embodiment, as shown in fig. 2, 3, 4, and 5, the structure of the high-pressure sealing butt joint includes: comprises a connecting pipe 41 which is distributed along the water injection direction in sequence and a sleeve 42 which is sleeved with the header water inlet pipe 31 of the coiled pipe heat exchange module 3, one end of the pipe ends at the two sides of the connecting pipe 41 far away from the sleeve 42 is a water inlet end, one end close to the sleeve 42 is a water outlet end, a quick nipple 43 is arranged at the water inlet end of the adapter 41, a adapter flange 44 is arranged at the water outlet end of the adapter 41, one end of the two side pipe ends of the sleeve 42 close to the connecting pipe 41 is a water inlet end, one end far away from the connecting pipe 41 is a water outlet end, a fixing mechanism for connecting the sleeve 42 and the header inlet pipe 31 in a sealing manner is arranged at the water outlet end of the sleeve 42, a sleeve flange plate 45 is arranged at the water inlet end of the sleeve 42, a spring positioning table 46 is arranged at the center of the sleeve flange plate 45, and the spring positioning table 46 is connected with the sleeve flange plate 45 into a whole through a plurality of radial rods 47 which are circumferentially arranged outside the spring positioning table 46; a supporting pipe 48 used for communicating the sleeve 42 with the connecting pipe 41 is arranged between the sleeve flange disc 45 and the connecting pipe flange disc 44, the connecting pipe 41, the supporting pipe 48 and the sleeve 42 jointly form a water passing channel, the sleeve 42, the supporting pipe 48 and the connecting pipe 41 are connected and fixed together through a fastening assembly, a stop door 49 is arranged between the spring positioning table 46 and the water outlet end of the connecting pipe 41, a spring 410 is connected between the stop door 49 and the spring positioning table 46, and the stop door 49 always has the tendency of being tightly pressed on the end face of the water outlet end of the connecting pipe 41 by the spring 410; when the water pressure on the pipe connecting side is greater than the sum of the acting force of the spring and the water pressure on the sleeve pipe side, the stop gate 49 can leave the end face of the water outlet end of the pipe connecting pipe under the action of the water pressure on the pipe connecting side to open the water passing channel, and when the water pressure on the sleeve pipe side is greater than the water pressure on the pipe connecting side, the stop gate 49 can be pressed on the end face of the water outlet end of the pipe connecting pipe 41 under the combined action of the water pressure on the sleeve pipe side and the spring 410 to cut off the water passing channel;
in this embodiment, the structure of the fixing mechanism includes: the inner diameter of the water outlet end of the sleeve 42 is larger than that of the water inlet end of the sleeve 42, so that an annular shoulder for the end face of the water inlet and outlet pipe of the header to abut against is formed at the reducing part of the inner wall of the sleeve 42, and a first sealing gasket 411 is arranged on the annular shoulder; a hoop tying disc 412 is fixedly sleeved outside the water outlet end of the sleeve 42, and four corners of the hoop tying disc 412 are respectively provided with a mounting hole which axially penetrates through the hoop tying disc 412; the fixing mechanism is simple in structure, convenient to assemble, disassemble and maintain and capable of greatly improving working efficiency;
in this embodiment, the structure of the fastening assembly includes: a plurality of first through holes 441 axially penetrating through the pipe flange plate 44 are circumferentially arranged on the pipe flange plate 44, a plurality of second through holes 451 axially penetrating through the pipe flange plate 45 are circumferentially arranged on the sleeve flange plate 45, the first through holes 441 of the pipe flange plate 44 and the second through holes 451 of the sleeve flange plate 45 are in one-to-one correspondence, a fastening bolt 415 is respectively penetrated through each pair of corresponding first through holes 441 and second through holes 451, a screw rod of each fastening bolt 415 penetrates through the corresponding first through holes 441 and second through holes 451 and is respectively in threaded connection with a fastening nut 416, all the fastening nuts 416 are screwed, so that the pipe flange plate 44 and the sleeve flange plate 45 are oppositely sealed and clamped with the supporting pipe 48, and the sleeve 42, the supporting pipe 48 and the connecting pipe 41 are detachably connected and fixed together, the fastening assembly has a simple structure, and can facilitate the dismounting and maintenance of the sleeve, the supporting pipe and the connecting pipe 41, the assembly and maintenance efficiency is improved;
in this embodiment, annular positioning grooves for inserting the supporting pipes 48 are respectively formed in the end faces of the opposite sides of the sleeve flange plate 45 and the pipe connecting flange plate 44, the pipe ends of the two sides of the supporting pipes 48 are respectively inserted into the corresponding annular positioning grooves of the two sides, and a second sealing washer 417 for sealing a gap between the flange plate and the supporting pipe 48 is respectively placed in each annular positioning groove, so that the sealing effects of the sleeve, the supporting pipe and the pipe connecting pipe can be improved, and the use stability of the equipment is improved; in the embodiment, a third sealing washer 418 is arranged between the stop door 49 and the water outlet end face of the adapter tube 41, and when the stop door 49 is pressed against the water outlet end face of the adapter tube through the third sealing washer 418, the third sealing washer 418 seals a gap between the stop door 49 and the water outlet end face of the adapter tube 41, so that the sealing effect between the stop door and the water outlet end face of the adapter tube can be improved, and the use stability of the device is further improved;
in this embodiment, each spoke 47 is provided with a conduit 421 axially extending to the pipe connecting flange 44, all the conduits 421 surround the through-stop gate 49, and all the conduits 421 form a guide channel which enables the through-stop gate 49 to accurately move to the water outlet end face of the pipe connecting 41, so that the use stability of the device can be further improved; in this embodiment, a first positioning boss 461 protruding toward the connection pipe side and allowing the spring to be sleeved is disposed at the center of the spring positioning table 46, a second positioning boss 491 protruding toward the sleeve pipe side and allowing the spring to be sleeved is disposed at the center of the stop door 49, and two ends of the spring 410 are respectively sleeved on the first positioning boss 461 and the second positioning boss 491, so that the stop door and the spring are installed together in a split manner, and the spring and the stop door can be more conveniently folded and maintained;
in this embodiment, as shown in fig. 6 and 7, the structure of the nozzle cap 5 includes: a solid central screw 51, a second locking nut 52 is connected with one end of the central screw 51 through a thread, a third locking nut 53 is connected with the other end of the central screw 51 through a thread, two first pushing and pressing shaft sleeves 54 and a first flexible sleeve 55 made of rubber materials or other elastic materials are sequentially and movably sleeved on the central screw 51 between the second locking nut 52 and the third locking nut 53, a first locking and positioning ring is arranged between the two first pushing and pressing shaft sleeves 54 and consists of a plurality of independent first arc-shaped shaft tiles 56, a first expansion groove 57 convenient for the two ends of the first arc-shaped shaft tiles 56 to be outwards opened is arranged on the outer wall of each first arc-shaped shaft tile 56 along the circumferential direction, each first arc-shaped shaft tile 56 is arranged in a shape that the two ends are thin along the axial direction and the middle is thick, so that two ends of the first locking and positioning ring form a tapered channel convenient for the first pushing and pressing shaft sleeves 54 to be pushed in, when the second locking nut 52 or the third locking nut 53 is tightened, the two first pushing and pressing shaft sleeves 54 can be pushed into the first locking and positioning ring along the tapered channel on the same side, so that the two ends of each first arc-shaped shaft tile 56 of each first locking and positioning ring are respectively outwards opened to expand and tightly position with the inner wall of the pipe orifice of the header drain pipe 32, the second locking nut 52 or the third locking nut 53 is continuously tightened to extrude the first flexible sleeve 55, and the first flexible sleeve 55 is extruded to expand along the radial direction to seal the pipe orifice of the header drain pipe 32;
in this embodiment, the first sawtooth grooves 59 are formed in the outer surface of the first arc-shaped shaft tile 56, and the friction between the first arc-shaped shaft tile 56 and the inner wall of the pipe orifice of the header drain pipe 32 can be improved through the first sawtooth grooves 59, so that the first arc-shaped shaft tile is more firmly expanded and fixed with the inner wall of the pipe orifice of the header drain pipe 32, and the use stability and the safety of the device are greatly improved; in this embodiment, the first supporting sleeve 510 is sleeved on the central screw 51 between the first flexible sleeve 55 and the second locking nut 52 on the corresponding side, and the second supporting sleeve 511 and the first sleeve 512 are sleeved on the central screw 51 between the first pushing and pressing sleeve 54 and the third locking nut 53 on the corresponding side, so that the position of the locking and positioning ring in the header drain pipe 32 can be conveniently adjusted, and the operation is more convenient;
as shown in fig. 8, 9 and 10, the pipe end fitting 7 includes: a hollow central tube 71, a pressure gauge 72 is arranged at a position close to the tube opening on one side of the central tube 71, the pressure gauge 72 is connected with the central tube 71 through a bypass tube 74 with a stop valve 73, two locking nuts, namely a fourth locking nut 75 and a fifth locking nut 76, are in threaded connection on the central tube 71, two second push shaft sleeves 77 and a second flexible sleeve 78 made of rubber or other elastic materials are sequentially and movably sleeved on the central tube 71 between the fourth locking nut 75 and the fifth locking nut 76, a second locking positioning ring is arranged between the two second push shaft sleeves 77 and consists of a plurality of independent second arc-shaped shaft tiles 79, a second expansion groove 710 which is convenient for the two ends of each second arc-shaped shaft tile 79 to outwards open is arranged on the outer wall of each second arc-shaped shaft tile 79 along the circumferential direction, each second arc-shaped shaft tile 79 is arranged in a shape that the two ends are thin along the axial direction and the middle is thick, two ends of the second locking positioning ring form tapered channels which are convenient for pushing the second pushing shaft sleeve 77 into, when the fourth locking nut 75 or the fifth locking nut 76 is tightened, the two second pushing shaft sleeves 77 can be pushed into the second locking positioning ring along the tapered channels on the same side, two ends of each second arc-shaped shaft tile 79 of each lobe of the second locking positioning ring are respectively expanded outwards to be expanded and positioned with the inner wall of the header exhaust pipe 33, the fourth locking nut 75 or the fifth locking nut 76 is continuously tightened to extrude the second flexible sleeve 78, and the second flexible sleeve 78 is expanded along the radial direction to seal a gap between the central pipe 71 and the inner wall of the header exhaust pipe 33; in this embodiment, the second sawtooth grooves 711 are formed in the outer surface of the second arc-shaped shaft tile 79, and the friction between the second arc-shaped shaft tile 9 and the inner wall of the header exhaust pipe 33 can be improved through the second sawtooth grooves 711, so that the second arc-shaped shaft tile is more firmly expanded and fixed with the inner wall of the header exhaust pipe 33, and the use stability and safety of the equipment are greatly improved; in this embodiment, the third support sleeve 712 is sleeved on the central tube 71 between the second flexible sleeve 78 and the corresponding fourth lock nut 75, and the fourth support sleeve 713 and the second sleeve 714 are sleeved on the central tube 71 between the second push sleeve 77 and the corresponding fifth lock nut 76, so as to facilitate the adjustment of the position of the locking positioning ring in the header exhaust pipe 33, and the operation is more convenient;
in this embodiment, the structure of the reversing connection pipe group includes: a large-caliber water inlet branch pipe 81 connected with the outlet of the high-pressure water pump 1, a large-caliber air inlet branch pipe 82 connected with the outlet of the high-pressure centrifugal fan 2, a large-caliber connecting main pipe 83 connected with the high-pressure sealing butt joint 4, a quick outer joint 831 which is matched and quickly connected with the quick inner joint 43 of the connecting pipe 41 in the high-pressure sealing butt joint 4 and a three-way reversing valve 84 are arranged at the pipe end of the connecting main pipe 83, two inlets of the three-way reversing valve 84 are respectively connected with the water inlet branch pipe 81 and the air inlet branch pipe 82, and the outlet of the three-way reversing valve 84 is connected with the connecting main pipe 83; the reversing connecting pipe set is simple in structure and convenient to install and maintain;
in this embodiment, in order to improve the automation level of the equipment, the system further comprises a PLC control system 9, the PLC control system 9 is simultaneously in signal connection with the high-pressure water pump 1, the high-pressure centrifugal fan 2, the hydraulic press 6 and the three-way reversing valve 84, and the PLC control system 9 can control the high-pressure water pump 1, the high-pressure centrifugal fan 2, the hydraulic press 6 and the three-way reversing valve 84 to be turned off; in the embodiment, the filter 10 and the flow regulating valve 11 are further sequentially arranged at the inlet of the high-pressure water pump 1 along the water injection direction, so that the flow and the water quality of water can be better controlled, and the use stability and the use safety of the equipment are improved;
the invention relates to a hydraulic test method for a coiled tube heat exchange module, which comprises the following steps:
step (1): install high-pressure seal butt joint on header inlet tube 31 earlier, specifically operate as follows: firstly, the U-shaped binding hoop 413 is detached, then the sleeve 42 is sleeved outside the header water inlet pipe 31, then the U-shaped binding hoop 413 is clamped on the water inlet header through the U-shaped bayonet, the straight sections at two sides of each U-shaped binding hoop 413 respectively penetrate through the corresponding mounting holes and then are in threaded connection with a first locking nut 414, then all the first locking nuts 414 are screwed, so that the end surface of the header water inlet pipe 31 is tightly pressed on a first sealing washer 411 of the annular shoulder, and the sleeve 41 and the header water inlet pipe 31 are connected together in a sealing manner; then the quick external connector 831 connected with the pipe end of the main pipe 83 is quickly connected with the quick internal connector 43 on the connecting pipe 41 in a clamping way, and then the inlet of the filter 10 is connected with a water source;
and then the pipe end joint 7 at the pipe end of the outlet connecting pipe 61 of the hydraulic press 6 is in sealed butt joint with the header exhaust pipe 33 of the coiled pipe heat exchange module 3, and the specific operation is as follows: the fourth locking nut 75, the third supporting sleeve 712, the second flexible sleeve 78, the second locking positioning ring, the second pushing sleeve 77 and the fourth supporting sleeve 713 on the central tube 71 are firstly extended into the end of the header exhaust pipe 32 together until the pressure gauge 72 is located at a position close to the opening of the header exhaust pipe 32, tightening the fifth locking nut 76, wherein the fifth locking nut 76 can push the two second pushing shaft sleeves 77 into the second locking positioning ring along the same-side tapered channel and simultaneously extrude the second flexible sleeve 78, so that the two ends of each second arc-shaped shaft tile 79 of each second locking positioning ring are respectively expanded outwards to be tightly positioned with the inner wall of the pipe end of the header exhaust pipe 33, and the fifth locking nut 76 is continuously tightened to extrude the second flexible sleeve 78, so that the second flexible sleeve 78 is expanded along the radial direction to seal the gap between the central pipe 71 and the inner wall of the header exhaust pipe 33, and thus the sealed butt joint of the pipe end connector 7 and the header exhaust pipe 33 is completed;
step (2): large-water-volume irrigation:
(2.1) firstly, the PLC control system 9 controls the three-way reversing valve 84 to reverse, so that the connecting main pipe 83 is only communicated with the water inlet branch pipe 81, and the PLC control system controls the high pressure water pump 1 to start, after the high pressure water pump 1 is started, the high pressure water enters the connecting pipe 41 through the filter 10, the flow regulating valve 11, the high pressure water pump 1, the water inlet branch pipe 81 and the connecting main pipe 83 in sequence, because the water pressure at the connecting pipe side is greater than the sum of the spring acting force and the water pressure at the sleeve pipe side, therefore, the stop gate 49 will leave the end face of the water outlet end of the connecting pipe under the action of the water pressure at the side of the connecting pipe to open the water passage, so that the high-pressure water introduced into the connecting pipe 41 enters the stay tube 48, the high-pressure water filled into the coiled pipe heat exchange module can sweep the garbage sundries in the coiled pipe heat exchange module 3, and the garbage sundries are swept out from the header drain pipe 32;
(2.2) when the coiled pipe heat exchange module is filled with water and the water flowing out of the header drain pipe 32 of the coiled pipe heat exchange module 3 has no garbage, enabling the PLC control system 9 to control to close the three-way reversing valve 84 and send the water to the high-pressure water pump 1; then, the header drain pipe 32 is blocked by the pipe orifice end enclosure 5, and the specific operations are as follows: the second locking nut 52, the first supporting sleeve 510, the first flexible sleeve 55, the first locking positioning ring, the first pushing shaft sleeve 54 and the second supporting sleeve 511 on the central screw 51 of the pipe orifice end enclosure 5 are extended into the header drain pipe 32 together, then the third locking nut 53 is tightened, the third locking nut 53 can push the two first pushing shaft sleeves 54 into the first locking positioning ring along the same-side tapered channel in the tightening process, so that the two ends of the first arc-shaped shaft tiles 56 of each petal of the first locking positioning ring are respectively outwards expanded and tightly positioned with the inner wall of the header drain pipe 32, then the third locking nut 53 is continuously tightened to extrude the first flexible sleeve 55, and the first flexible sleeve 55 is expanded along the radial direction to seal the header drain pipe 32 after being extruded;
and (3): pressure maintaining:
(3.1) controlling a PLC (programmable logic controller) control system 9 to start a hydraulic press 6, controlling the pressure in a coiled tube heat exchange module 3 to slowly rise by the hydraulic press 6, and in the process that the pressure in the coiled tube heat exchange module 3 gradually rises, when the water pressure at the sleeve side connected with a header water inlet pipe 31 is higher than the water pressure at the pipe connecting side, a stop door 49 is tightly pressed on the end surface of the water outlet end of a connecting pipe 41 under the combined action of the water pressure at the sleeve side and a spring 410 to cut off a water passing channel, so that the header water inlet pipe 31 is automatically sealed and blocked, at the moment, the coiled tube heat exchange module 3 is a relatively closed space, continuously pressurizing the coiled tube heat exchange module 3 by the hydraulic press 6, stopping pressurizing and primarily checking leakage after the pressure in the coiled tube heat exchange module 3 rises to the working pressure of the module, and continuously pressurizing after the butt pipe ends are ensured to be well sealed and have no leakage; the specific operations for performing the leak check are as follows: firstly, blowing off accumulated water on the outer wall of the coiled tube heat exchange module 3 by using compressed air, and then, checking whether leakage occurs in each tube and welding seams of the coiled tube heat exchange module 3 by using a highlight flashlight;
(3.2) observing the pressure gauge 72, and stopping the water press 6 by the PLC control system 9 for pressure maintaining for 20-30 min after the pressure in the coiled tube heat exchange module 3 is increased to the module test pressure and the pointer of the pressure gauge 72 is stable; the specific operation of performing the leak check during pressure holding is as follows: firstly, blowing off accumulated water on the outer wall of the coiled tube heat exchange module 3 by using compressed air, and then, checking whether leakage occurs in each tube and welding seams of the coiled tube heat exchange module 3 by using a highlight flashlight;
(3.3) then reducing the pressure to the working pressure of the module and carrying out a third leakage check, wherein the specific operation of the leakage check is as follows: firstly, blowing off accumulated water on the outer wall of the coiled tube heat exchange module 3 by using compressed air, and then, detecting whether leakage occurs to each tube and welding seams of the coiled tube heat exchange module 3 by using a highlight flashlight, wherein the leakage is qualified if no leakage occurs, thereby completing the leakage detection of the hydrostatic test;
and (4): large air volume drainage:
(4.1) removing the end socket of the pipe orifice of the header drain pipe 32, discharging water in the coiled pipe heat exchange module 3, then controlling the three-way reversing valve 84 to reverse again by the PLC control system 9, enabling the connecting main pipe 83 to be only communicated with the air inlet branch pipe 82, controlling the high-pressure centrifugal fan 2 to start by the PLC control system, carrying out large-air-volume blowing and drainage on the interior of the coiled pipe heat exchange module 3 by the high-pressure centrifugal fan 2 at the moment, continuously blowing until no water drips from the pipe orifice of the header drain pipe 32 and no accumulated water exists at the bottom of the header, finally checking by using a clean towel, then turning off the high-pressure centrifugal fan 2 by the PLC control system 9 to finish drainage operation, and enabling the coiled pipe heat exchange module after drainage operation to have no accumulated water,
the invention has the advantages that:
(1) the water is poured through large water quantity, the water pouring time of the hydrostatic test is short, and the production efficiency is high;
(2) the water in the module after the water pressure test can be completely drained by blowing and draining with large air volume, so that a series of failure hidden dangers such as pipe wall corrosion, pipe frost crack and the like caused by the accumulated water in the module are eliminated, the service life of the heat exchange device is greatly prolonged, and the production and operation safety of a power plant is ensured;
(3) the high-pressure sealing butt joint has the advantages of simple structure, convenience in operation, disassembly and maintenance, time and labor saving, and greatly improves the working efficiency;
(4) the pipe orifice end socket has simple structure, convenient operation, low use cost and good fixing effect with the pipe end; the pressure bearing device can bear higher pressure and has long effective service life; the locking positioning ring can be detached for replacement and maintenance without withdrawing parts such as the locking nut on the central screw rod, so that the maintenance process is simplified, and the maintenance efficiency is improved;
(5) the pipe end joint has simple structure, good fixing effect with the pipe end and high use stability; the sealing effect between the hydraulic test tube and the tube end is good, the pressure bearing is high, and effective guarantee is provided for the normal operation of a hydraulic test; the expansion pipe has the advantages of convenient operation, long service life, low use cost and convenient disassembly, assembly and maintenance, and particularly, when the expansion pipe is maintained, the expansion pipe can be disassembled for replacement and maintenance without withdrawing parts such as a locking nut on the central pipe, so that the maintenance process is simplified, and the maintenance efficiency is improved; the function is various, can know the inside real-time pressure of coiled pipe heat exchange module through the manometer accurately in real time.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made in accordance with the technical spirit of the present invention are within the scope of the present invention as claimed.
Claims (8)
1. A hydraulic test method for a coiled tube heat exchange module is characterized by comprising the following steps: the method comprises the following steps:
step (1): firstly, connecting a high-pressure water pump with a header water inlet pipe of a coiled pipe heat exchange module, and then connecting a hydraulic press with a header exhaust pipe of the coiled pipe heat exchange module;
step (2): starting a high-pressure water pump, quickly filling water into the coiled pipe heat exchange module, and flushing garbage sundries in the coiled pipe heat exchange module; when the coiled pipe heat exchange module is filled with water and the water flowing out of the header drain pipe has no garbage, the high-pressure water pump is stopped; then, plugging the header drain pipe by using a pipe orifice end socket;
and (3): starting a hydraulic press to boost the coiled tube heat exchange module, stopping boosting and carrying out primary leakage check after the pressure in the coiled tube heat exchange module is increased to the working pressure of the module, continuing boosting to the testing pressure of the module after no leakage is ensured, then stopping the hydraulic press, maintaining the pressure for a certain time, carrying out secondary leakage check, then reducing the pressure to the working pressure of the module, carrying out tertiary leakage check, and determining that the product is qualified if no leakage exists;
and (4): removing a pipe orifice end socket on a header drain pipe, discharging water in the coiled pipe heat exchange module, connecting a high-pressure centrifugal fan to a header water inlet pipe of the coiled pipe heat exchange module, starting the high-pressure centrifugal fan, performing large-air-volume sweeping and draining on the interior of the coiled pipe heat exchange module, and continuously sweeping until no water drips at the pipe orifice of the header drain pipe and no water is accumulated at the bottom of the header, and stopping the high-pressure centrifugal fan;
the high-pressure water pump and the high-pressure centrifugal fan are simultaneously connected with a high-pressure sealing butt joint which is in sealing butt joint with a header water inlet pipe through a reversing connecting pipe group, and the reversing connecting pipe group can enable the high-pressure sealing butt joint to be only communicated with the high-pressure water pump or only communicated with the high-pressure centrifugal fan;
wherein, the structure of high-pressure seal butt joint includes: the water-filling device comprises a connecting pipe and a sleeve pipe which are sequentially distributed along the water-filling direction, wherein one end of the pipe ends at two sides of the connecting pipe, which is far away from the sleeve pipe, is a water inlet end, and one end of the pipe ends at two sides of the connecting pipe, which is close to the sleeve pipe, is a water outlet end; a supporting pipe used for communicating the sleeve with the connecting pipe is arranged between the sleeve flange disc and the connecting pipe flange disc, the connecting pipe, the supporting pipe and the sleeve jointly form a water passage, the connecting pipe, the supporting pipe and the sleeve are connected and fixed together through a fastening assembly, a check door is arranged between the spring positioning table and the water outlet end of the connecting pipe, a spring is connected between the check door and the spring positioning table, and the spring enables the check door to always have the tendency of being tightly pressed on the end face of the water outlet end of the connecting pipe; when the water pressure of the pipe connecting side is greater than the sum of the acting force of the spring and the water pressure of the sleeve pipe side, the stop gate can leave the end face of the water outlet end of the pipe connecting under the action of the water pressure of the pipe connecting side, so that the water passing channel is opened, and when the water pressure of the sleeve pipe side is greater than the water pressure of the pipe connecting side, the stop gate can be tightly pressed on the end face of the water outlet end of the pipe connecting under the combined action of the water pressure of the sleeve pipe side and the spring, so that the water passing channel is cut off.
2. The hydrostatic test method of claim 1, wherein: the structure of the reversing connection pipe group comprises: the high-pressure centrifugal fan comprises a water inlet branch pipe connected with an outlet of the high-pressure water pump, an air inlet branch pipe connected with an outlet of the high-pressure centrifugal fan, a connecting main pipe connected with a high-pressure sealing butt joint, and a three-way reversing valve, wherein two inlets of the three-way reversing valve are respectively connected with the water inlet branch pipe and the air inlet branch pipe, and an outlet of the three-way reversing valve is connected with the connecting main pipe.
3. The hydrostatic test method of claim 1, wherein: the structure of the fixing mechanism comprises: the inner diameter of the water outlet end of the sleeve is larger than that of the water inlet end of the sleeve, so that an annular convex shoulder for the end surface of the water inlet pipe of the header to abut against is formed at the diameter-variable position of the inner wall of the sleeve, and a sealing gasket is arranged on the annular convex shoulder; a hoop binding disc is fixedly sleeved outside the water outlet end of the sleeve, and four corners of the hoop binding disc are respectively provided with a mounting hole which axially penetrates through the hoop binding disc; the water inlet and outlet pipe is characterized by further comprising two U-shaped binding hoops capable of being clamped on the header, the outer end portions of the two side straight sections of each U-shaped binding hoop are threaded sections, the two U-shaped binding hoops correspond to a pair of mounting holes in the upper side and the lower side of the binding hoop disc respectively, each U-shaped binding hoop is clamped on the header through a U-shaped bayonet, the two side straight sections of each U-shaped binding hoop penetrate through the corresponding mounting holes respectively and are in threaded connection with locking nuts, all the locking nuts are screwed, the end face of the water inlet and outlet pipe is pressed on a sealing gasket of an annular convex shoulder in the sleeve, and the water inlet and outlet pipe is connected with the sleeve in the outside in a sealing mode.
4. The hydrostatic test method of claim 1, wherein: the structure of the fastening assembly includes: the pipe connecting flange plate is provided with a plurality of first through holes which axially penetrate through the pipe connecting flange plate along the circumferential direction, the pipe connecting flange plate is provided with a plurality of second through holes which axially penetrate through the pipe connecting flange plate along the circumferential direction, the first through holes of the pipe connecting flange plate and the second through holes of the pipe connecting flange plate are in one-to-one correspondence, each pair of corresponding first through holes and second through holes are respectively provided with a fastening bolt in a penetrating way, a screw rod of each fastening bolt penetrates through the corresponding first through holes and second through holes and then is respectively connected with a fastening nut in a threaded way, all the fastening nuts are screwed, the pipe connecting flange plate and the pipe connecting flange plate are in a relative sealing and clamping supporting pipe, and therefore the sleeve pipe, the supporting pipe and the connecting pipe can be detachably connected and fixed together.
5. The hydrostatic test method of claim 1, wherein: annular positioning grooves for embedding the stay tubes are respectively arranged on the end faces of the opposite sides of the sleeve flange plate and the pipe connecting flange plate, the pipe ends of the two sides of the stay tubes are respectively embedded into the corresponding annular positioning grooves of the two sides, and a first sealing gasket for sealing a gap between the flange plate and the stay tubes is respectively arranged in each annular positioning groove; and when the check door is tightly pressed on the end face of the water outlet end of the connecting pipe through the second sealing washer, the second sealing washer can seal a gap between the check door and the end face of the water outlet end of the connecting pipe.
6. The hydrostatic test method of claim 1, wherein: each spoke rod is provided with a guide pipe which axially extends to the flange of the connecting pipe, all the guide pipes surround the outer side of the stop gate, and all the guide pipes form a guide channel which can ensure that the stop gate accurately moves to the end face of the water outlet end of the connecting pipe.
7. The hydrostatic test method of claim 1, wherein: the hydraulic press connects the collection case blast pipe through setting up in the pipe end of its export connecting pipe end is sealed, the structure that the pipe end connects includes: the pressure gauge is arranged at one end of the central tube, the pressure gauge is connected with the central tube through a bypass tube with a check valve, two locking nuts are connected to the central tube through threads, a flexible sleeve and two pushing and pressing shaft sleeves are sequentially and movably sleeved on the central tube between the two locking nuts, a locking and positioning ring is arranged between the two pushing and pressing shaft sleeves and consists of a plurality of independent arc-shaped shaft tiles, an expansion groove convenient for the two ends of each arc-shaped shaft tile to outwards open is arranged on the outer wall of each arc-shaped shaft tile along the circumferential direction, each arc-shaped shaft tile is arranged in a shape that the two ends are thin along the axial direction and the middle is thick, a tapered channel convenient for the pushing and pressing shaft sleeves to push in is formed at the two ends of the locking and positioning ring, when the locking nuts are tightened, the locking nuts can push the two pushing and pressing shaft sleeves into the locking and positioning ring along the tapered channel at the same side, the two ends of each arc-shaped shaft tile of the locking and positioning ring are respectively outwards opened to tightly expand with the inner wall of a tube end, and continuously tightening the locking nut to extrude the flexible sleeve, so that the flexible sleeve expands along the radial direction to seal the gap between the central tube and the inner wall of the tube end.
8. The hydrostatic test method of claim 1, wherein: the structure of mouth of pipe head includes: the central screw rod, there is a lock nut at both ends of the central screw rod separately whorl, there are a flexible sleeve and two bulldozing axle sleeves in order to movably cover on the central screw rod between two lock nuts, there are locking locating rings between two bulldozing axle sleeves, the locking locating ring is made up of independent arc shaft tiles of several petals, there are convenient arc shaft tile both ends to open the expanded groove outwards on the outer wall of every petal arc shaft tile along the direction of circumference, every petal arc shaft tile is set up in the shape of being thin and thick in the middle along the axial both ends, make both ends of the locking locating ring form the taper channel that is convenient for bulldozing the axle sleeve to push in, when tightening up the lock nut, the lock nut can push two bulldozing axle sleeves into the locking locating ring along the same side taper channel, make both ends of every petal arc shaft tile of the locking locating ring expand and position with the inner wall of the pipe orifice tightly separately, continue tightening up the lock nut and extrude the flexible sleeve, the flexible sleeve is radially expanded to seal the orifice.
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| CN110426277B (en) * | 2019-08-19 | 2023-12-05 | 江苏龙净节能科技有限公司 | High-pressure sealing butt joint device for water pressure test of coiled pipe heat exchange module |
| CN112798427A (en) * | 2021-01-22 | 2021-05-14 | 东方电气集团科学技术研究院有限公司 | Automatic pressure testing system for water pressure of coiled pipe |
| CN113175808A (en) * | 2021-05-21 | 2021-07-27 | 鲁西工业装备有限公司 | Heat exchange tube drying system and method |
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