Special tool for disassembling and assembling large-interference-magnitude part of water feeding pump

Abstract

The special tool comprises a bracket, and further comprises a connecting shaft and a main shaft, a hand pump is installed at the top of the bracket, the connecting end of the hand pump is detachably connected with a high-pressure oil pipe, a lantern ring is connected to the periphery of the connecting shaft in a sleeved mode, and the upper end and the lower end of the interior of the lantern ring are in interference connection with bearings. After a part to be disassembled is in butt joint with the pull rod, the lantern ring slides to enable the other end of the pull rod to penetrate into the through hole in the insertion column to be fixed, high-pressure oil is injected into the assembly by operating a hand pump, after the assembly to be disassembled is subjected to high oil pressure, an inner hole expands, interference between the assembly and a main shaft is reduced, and only small interference is kept; at the moment, the lantern ring is pulled outwards along the connecting shaft through the inserting rod, and the to-be-disassembled assembly can be disassembled from the main shaft through the pull rod, so that the maintenance progress of the water feeding pump is ensured, the field maintenance time is saved, and the maintenance efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of water pump maintenance technology, and in particular to a special tooling for disassembling and assembling large interference fit parts of water pumps. Background Technology

[0002] Power plant feedwater pumps are pumps responsible for supplying water to boilers. They are mainly divided into two types: electric feedwater pumps and steam-driven feedwater pumps. Their working principle relies on the rotation of blades in the pump impeller. Through this rotation, the blades exert a force on the fluid, causing it to flow from the center of the impeller to the edge under the push of inertial centrifugal force, thereby generating high-speed flow and high pressure. In this way, the fluid can flow out of the impeller at high velocity and high pressure and enter the pump casing, ultimately realizing the water supply function. They are widely used and are important auxiliary machines in power plants.

[0003] Existing feedwater pumps have the following drawbacks during maintenance and repair: the operational stability of the feedwater pump directly affects the operational safety of the entire unit. Once an accident occurs on-site, rapid repair is required. The feedwater pump design takes into account the importance of the pump shaft during operation. The balance drum, thrust disc, pump end coupling, and pump shaft are all keyless and have large interference fits. Since no keyway machining is required, the stress concentration that may occur at these three points on the shaft during operation is greatly reduced. However, it is very difficult to assemble and disassemble the pump. If the disassembly tooling is not strong enough, it can easily damage the pump shaft. Therefore, we propose a special tooling for disassembling and assembling large interference fit parts of the feedwater pump. Utility Model Content

[0004] The main purpose of this utility model is to provide a special tooling for disassembling and assembling large interference fit parts of a water pump. Through the cooperation of various components, the disassembly and disassembly of the balance drum, thrust disc and coupling assembly can be achieved quickly and stably, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A special tooling for disassembling and assembling large interference fit parts of a water pump includes a support, a connecting shaft, and a main shaft. A hand pump is mounted on the top of the support, and a high-pressure oil pipe is detachably connected to the connecting end of the hand pump. A collar is sleeved on the outer circumference of the connecting shaft, and bearings are interference-fitted at both the upper and lower ends of the collar. Inserts are interference-fitted inside the bearings, and through holes are opened inside the inserts. A tie rod is detachably connected to the inserts, and studs B are integrally formed at both ends of the tie rod. A balance drum, a thrust plate, and a coupling are interference-fitted on the outer circumference of the main shaft.

[0007] Furthermore, it also includes slots. The bracket has horizontal slots inside, and a storage box is inserted into the slots. Casters are installed at the bottom of the bracket. The top of the bracket has slots for retracting and extending the pull rod on both sides of the hand pump. A magnetic sheet is embedded in the inner wall of the bracket near the end of the storage box. A retracting slot is provided in the empty space at the top of the bracket. The retracting slot has different specifications and can be used to hold pull rod assemblies of different specifications. The bracket has slots inside and a storage box is inserted. The cavity structure inside the storage box provides a certain storage space. When not in use, it can store disassembled components such as collars, connecting shafts, and inserts for easy storage and retrieval. When the storage box is closed, the magnetic sheet attracts the end of the storage box to keep it closed. The bottom of the bracket has a caster structure. When needed, the hand pump operating rod can be raised and the end can be inserted into a hollow tube to move the whole device.

[0008] Furthermore, the hand pump control terminal is equipped with a pressure gauge, the high-pressure oil pipe end is provided with an oil pipe joint, and the balance drum, thrust plate and coupling are all provided with oil injection holes, and the oil pipe joint is connected to the oil injection hole; the high-pressure oil pipe is connected to the oil injection hole on the surface of the equipment through the oil pipe joint, and the pressure change can be observed when operating the hand pump through the pressure gauge.

[0009] Furthermore, the end of the connecting shaft is integrally formed with a stud A that connects to the main shaft, and the stud B at one end of the pull rod passes through the through hole and a nut is screwed onto the outer circumference of the stud B; when in use, the connecting shaft is connected to the main shaft by screwing the stud A into the end of the main shaft, and the end of the pull rod passes through the stud B and is screwed into the nut to connect the pull rod and the insert.

[0010] Furthermore, sleeves are welded to both ends of the outer wall of the collar, and insert rods are inserted inside the sleeves; after the collar is installed in place and connected to the component to be disassembled, the end of the insert rod can be inserted into the sleeve, and the component can be disassembled by pulling the insert rod outward.

[0011] Furthermore, an auxiliary plate is detachably connected to the end of the pull rod. A corresponding screw hole A is opened inside the auxiliary plate near the outer edge, and a stud B is screwed into screw hole A. symmetrical screw holes B are also opened inside the auxiliary plate near screw hole A, and bolts are detachably connected inside screw holes B. When disassembling the thrust plate, since there is a height difference between the end of the pull rod and the connecting hole of the thrust plate, an auxiliary plate can be added. The auxiliary plate is fitted against the surface of the thrust plate, screw holes B are aligned with the connecting hole of the thrust plate, and bolts are screwed in to fix them together. Then, the end of the pull rod is screwed into screw hole A, thereby connecting the auxiliary plate to the stud through the pull rod, compensating for the height difference, and enabling normal disassembly.

[0012] Compared with the prior art, this utility model has the following advantages: A hand pump is installed on the top of the support. The balance drum, thrust plate, and coupling are all installed on the outer periphery of the main shaft by interference fit. When the components need to be disassembled, the connecting shaft is first connected to the main shaft by stud A to make them on the same horizontal line. Then, the collar is put in. For the balance drum and coupling, the end of the tie rod is directly screwed into the side connection hole. For the thrust plate, an auxiliary plate is added for auxiliary connection. After the disassembled part is connected to the tie rod, the sliding collar makes the other end of the tie rod pass into the through hole inside the insert. Then, the nut is screwed in to fix the tie rod and the insert. The hand pump is connected to the oil injection hole of the disassembled component through a high-pressure oil pipe and oil pipe joint. By operating the hand pump, high-pressure oil is injected into the component. The inner hole of the disassembled component expands after being subjected to high oil pressure. The interference between the main shaft and the connecting shaft is reduced to a very small amount. At this point, by pulling the connecting rod along the outer collar of the connecting shaft, the disassembly assembly can be removed from the main shaft, thus ensuring the progress of water pump maintenance, saving on-site maintenance time, and improving maintenance efficiency. A storage slot is provided in the empty space at the top of the support. The storage slot has different specifications and can be used to hold different specifications of connecting rod assemblies. A slot is provided inside the support and a storage box is inserted. The internal cavity structure of the storage box provides a certain storage space. When not in use, the disassembled collar, connecting shaft, connecting rod, etc. can be stored for easy storage and retrieval. When the storage box is closed, the magnetic sheet attracts the end of the storage box to keep it closed. The bottom of the support is equipped with a caster structure. When needed, the hand pump operating rod can be raised and the hollow tube can be inserted into the end to move the entire device. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the support and disassembly assembly structure of a special tooling for disassembling and assembling a water pump with a large interference fit.

[0014] Figure 2 This is a schematic diagram of the structure of the balance drum in the disassembly state of a special tooling for disassembling and assembling a water pump with a large interference fit.

[0015] Figure 3 This is a schematic diagram of the thrust plate in the disassembly state of a special tooling for disassembling and assembling a water pump with a large interference fit.

[0016] Figure 4 This is a schematic diagram of the coupling in the disassembly state of a special tooling for disassembling and assembling a water pump with a large interference fit.

[0017] In the diagram: 1. Support; 2. Hand pump; 201. Pressure gauge; 202. High-pressure oil pipe; 203. Oil pipe connector; 3. Connecting shaft; 301. Stud A; 302. Collar; 303. Bearing; 304. Insert pin; 305. Through hole; 306. Tie rod; 307. Stud B; 308. Nut; 309. Sleeve; 310. Insert rod; 311. Auxiliary plate; 312. Screw hole A; 313. Screw hole B; 314. Bolt; 4. Slot; 402. Storage box; 403. Magnetic plate; 404. Caster; 405. Loading / unloading slot; 5. Main shaft; 501. Balance drum; 502. Thrust plate; 503. Coupling; 6. Oil filling hole. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] like Figure 1-4 As shown, a special tooling for disassembling and assembling large interference fit parts of a water pump includes a support 1, a connecting shaft 3, and a main shaft 5. A hand pump 2 is mounted on the top of the support 1, and a high-pressure oil pipe 202 is detachably connected to the connecting end of the hand pump 2. A collar 302 is sleeved on the outer periphery of the connecting shaft 3, and bearings 303 are interference fitted at both the upper and lower ends of the collar 302. Inserts 304 are interference fitted inside the bearings 303, and through holes 305 are opened inside the inserts 304. A tie rod 306 is detachably connected to the inserts 304, and studs B307 are integrally formed at both ends of the tie rod 306. A balance drum 501, a thrust plate 502, and a coupling 503 are interference fitted on the outer periphery of the main shaft 5.

[0020] This includes a slot 4, with a horizontally oriented slot 4 inside the support 1, into which a storage box 402 is inserted. Casters 404 are mounted on the bottom of the support 1. Retraction slots 405 for extending and retracting the pull rod 306 are located on both sides of the hand pump 2 at the top of the support 1. A magnetic sheet 403 is embedded in the inner wall of the support 1 near the end of the storage box 402. Retraction slots 405 are also provided in the empty space at the top of the support 1. These slots 405 have different specifications and can be used to accommodate pull rod 306 components of different specifications. The support 1 has a slot 4 inside which a storage box 402 is inserted. The cavity structure inside the storage box 402 provides a certain storage space. When not in use, it can store components such as the disassembled collar 302, connecting shaft 3, and insertion post 304 for easy storage and retrieval. When the storage box 402 is closed, the magnetic sheet 403 attracts the end of the storage box 402 to keep it closed. The bottom of the support 1 is equipped with casters 404. When needed, the operating lever of the hand pump 2 can be raised and the end can be fitted with a hollow tube to move the entire device.

[0021] The hand pump 2 is equipped with a pressure gauge 201 at its control end, and the high-pressure oil pipe 202 is provided with an oil pipe connector 203 at its end. The balance drum 501, thrust disc 502 and coupling 503 are all provided with oil injection holes 6, and the oil pipe connector 203 is connected to the oil injection holes 6. The high-pressure oil pipe 202 is connected to the oil injection holes 6 on the surface of the equipment through the oil pipe connector 203. The pressure change can be observed when operating the hand pump 2 through the pressure gauge 201.

[0022] The connecting shaft 3 has an integrally formed stud A301 at one end, which is connected to the main shaft 5. The stud B307 at one end of the pull rod 306 passes through the through hole 305 and is screwed with a nut 308 on the outer circumference of the stud B307. Both ends of the outer wall of the collar 302 are welded with sleeves 309, and insert rods 310 are inserted into the sleeves 309. When in use, the connecting shaft 3 is screwed into the end of the main shaft 5 by the stud A301 to achieve connection with the main shaft 5. The end of the pull rod 306 passes through the stud B307 and is screwed into the nut 308 to connect the pull rod 306 and the insert 304. When the collar 302 is installed in place and connected to the component to be disassembled, the end of the insert rod 310 can be inserted into the sleeve 309, and the component can be disassembled by pulling the insert rod 310 outward.

[0023] The pull rod 306 is detachably connected to an auxiliary plate 311. The auxiliary plate 311 has a corresponding screw hole A312 near the outer edge, and a stud B307 is screwed into the screw hole A312. The auxiliary plate 311 also has symmetrically arranged screw holes B313 near the screw hole A312, and bolts 314 are detachably connected to the screw holes B313. When disassembling the thrust plate 502, since there is a height difference between the end of the pull rod 306 and the connecting hole of the thrust plate 502, the auxiliary plate 311 can be added. The auxiliary plate 311 is placed against the surface of the thrust plate 502, the screw hole B313 is aligned with the connecting hole of the thrust plate 502, and the bolts 314 are screwed in to fix them together. Then, the end of the pull rod 306 is screwed into the screw hole A312, thereby connecting the auxiliary plate 311 to the stud 304 through the pull rod 306, compensating for the height difference and enabling normal disassembly.

[0024] It should be noted that this utility model is a special tooling for disassembling and assembling large interference fit parts of a water pump. In use, a hand pump 2 is installed on the top of the support 1. The balance drum 501, thrust disc 502, and coupling 503 are all installed on the outer periphery of the main shaft 5 using an interference fit connection. When disassembling the components, first connect the connecting shaft 3 to the main shaft 5 using stud A301, ensuring they are on the same horizontal line. Then, insert the collar 302. For the balance drum 501 and coupling 503, directly screw the end of the pull rod 306 into its side connection hole. For the thrust disc 502, an auxiliary disc 311 is added for auxiliary connection. After the part to be disassembled is connected to the pull rod 306, the sliding collar 302 allows the other end of the pull rod 306 to pass through the through hole 305 inside the insert 304, and then the nut is screwed in.

[0025] 308 fixes the pull rod 306 to the insert post 304. The hand pump 2 is connected to the oil injection hole 6 with the disassembly assembly via the high-pressure oil pipe 202 and the oil pipe connector 203. By operating the hand pump 2, high-pressure oil is injected into the assembly. After the disassembly assembly is subjected to high oil pressure, the inner hole expands, and the interference between it and the main shaft 5 is reduced to only a small interference. At this time, by pulling the insert rod 310 along the outer sleeve 302 of the connecting shaft 3, the disassembly assembly can be removed from the main shaft 5 via the pull rod 306, thereby ensuring the progress of water pump maintenance, saving on-site maintenance time, and improving maintenance efficiency. A receiving and releasing groove 405 is provided in the empty space at the top of the support 1 for receiving and releasing. The slot 405 has different specifications and can be used to clamp different specifications of pull rod 306 components. The bracket 1 has a slot 4 and a storage box 402 is inserted inside. The cavity structure inside the storage box 402 provides a certain storage space. When not in use, it can store disassembled components such as collar 302, connecting shaft 3, and insert post 304 for easy storage and retrieval. When the storage box 402 is closed, the magnetic sheet 403 attracts the end of the storage box 402 to keep it closed. The bottom of the bracket 1 is equipped with caster 404 structure. When needed, the operating rod of the hand pump 2 can be raised and the hollow tube can be inserted into the end to push the whole device.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A special tooling for disassembling and assembling a large interference fit component of a water pump, comprising a support (1), characterized in that, It also includes a connecting shaft (3) and a main shaft (5). A hand pump (2) is installed on the top of the support (1), and a high-pressure oil pipe (202) is detachably connected to the connecting end of the hand pump (2). A collar (302) is sleeved on the outer periphery of the connecting shaft (3), and bearings (303) are interference-fitted at both the upper and lower ends of the collar (302). Inserts (304) are interference-fitted inside the bearings (303), and through holes (305) are opened inside the inserts (304). A tie rod (306) is detachably connected to the inserts (304), and studs B (307) are integrally formed at both ends of the tie rod (306). A balance drum (501), a thrust plate (502), and a coupling (503) are interference-fitted on the outer periphery of the main shaft (5).

2. The special tooling for disassembling and assembling a large interference fit component of a water pump according to claim 1, characterized in that: It also includes a slot (4), the bracket (1) has a slot (4) horizontally opened inside and a storage box (402) is inserted into the slot (4), the bottom of the bracket (1) is equipped with casters (404), the top of the bracket (1) is provided with a retractable groove (405) for the retractable pull rod (306) on both sides of the hand pump (2), and a magnetic sheet (403) is embedded in the inner wall of the bracket (1) near the end of the storage box (402).

3. The special tooling for disassembling and assembling a large interference fit component of a water pump according to claim 1, characterized in that: The hand pump (2) is equipped with a pressure gauge (201) at the control end. The high-pressure oil pipe (202) is provided with an oil pipe joint (203) at the end. The balance drum (501), thrust plate (502) and coupling (503) are all provided with oil injection holes (6), and the oil pipe joint (203) is connected to the oil injection holes (6).

4. A special tooling for disassembling and assembling a large interference fit component of a water pump according to claim 1, characterized in that: The end of the connecting shaft (3) is integrally formed with a stud A (301) that is connected to the main shaft (5), and the stud B (307) at one end of the pull rod (306) passes through the through hole (305) and a nut (308) is screwed onto the outer periphery of the stud B (307).

5. A special tooling for disassembling and assembling a large interference fit component of a water pump according to claim 1, characterized in that: Both ends of the outer wall of the collar (302) are welded with sleeves (309), and insert rods (310) are inserted into the sleeves (309).

6. A special tooling for disassembling and assembling a large interference fit component of a water pump according to claim 1, characterized in that: The end of the pull rod (306) is detachably connected to an auxiliary plate (311). The auxiliary plate (311) has a corresponding screw hole A (312) near the outer edge, and a stud B (307) is screwed into the screw hole A (312). The auxiliary plate (311) has symmetrical screw holes B (313) near the screw hole A (312), and a bolt (314) is detachably connected inside the screw hole B (313).

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