Method for assembling large-diameter tooth-shaped thread ring of high-pressure main steam valve of steam turbine

An assembly method and a threaded ring technology, which are applied in the field of steam turbines, can solve problems such as low assembly efficiency, damaged serrated threads, and thread roughening of valve casings, and achieve the effects of convenient operation, high installation efficiency, and strong versatility

An assembly method and a threaded ring technology, which are applied in the field of steam turbines, can solve problems such as low assembly efficiency, damaged serrated threads, and thread roughening of valve casings, and achieve the effects of convenient operation, high installation efficiency, and strong versatility

CN107520602AInactive Publication Date: 2017-12-29HARBIN TURBINE
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  • Method for assembling large-diameter tooth-shaped thread ring of high-pressure main steam valve of steam turbine
  • Method for assembling large-diameter tooth-shaped thread ring of high-pressure main steam valve of steam turbine
  • Method for assembling large-diameter tooth-shaped thread ring of high-pressure main steam valve of steam turbine

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Experimental program
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Effect test

specific Embodiment approach 1

[0016] Specific implementation mode one: combine Figure 1 to Figure 4 To illustrate this embodiment, the specific steps of a method for assembling a large-diameter toothed threaded ring of a high-pressure main steam valve of a steam turbine described in this embodiment are as follows:

[0017] Step 1. Connect the 3M cyclone brush to the pneumatic tool to clean the threaded part of the threaded ring 1 and the valve housing 2;

[0018] Step 2. Fix the flange of the valve housing 2 upwards with a special fixture, adjust the flatness of the flange surface to no more than 0.2mm, connect the threaded ring 1 and the lifting tool 4 with bolts, and the lifting tool 4 passes the force measuring balance tool 5 is connected with the dynamometer 3, and the dynamometer 3 is connected with the crane;

[0019] Step 3: Mark the starting position of threaded ring 1 and valve casing 2, hoist the large-diameter serrated threaded ring 1 directly above the valve casing 2 by the crane and center i...

specific Embodiment approach 2

[0021] Specific implementation mode two: combination Figure 1 to Figure 4 Describe this embodiment, the hoisting tool 4 in step 2 of the assembly method of a large-diameter toothed threaded ring of a high-pressure main steam valve of a steam turbine described in this embodiment is composed of a plurality of claws 4-1, a ring 4-2, and a handle 4 -3 and a plurality of round steel 4-4, the lower surface of the ring 4-2 is provided with a plurality of claws 4-1, the handle 4-3 is arranged on the outer wall of the ring 4-2, and a plurality of round steel 4-4 is arranged on the outer wall of the ring 4-2, and the claw 4-1 is connected with the threaded ring 1.

specific Embodiment approach 3

[0022] Specific implementation mode three: combination Figure 1 to Figure 4 Describe this embodiment, the force measuring balance tool 5 in step 2 of a large-diameter toothed thread ring assembly method for a high-pressure main steam valve of a steam turbine described in this embodiment is composed of a chain lock 5-1, two shackles 5-2 and Two lifting ring screws 5-3, the upper end of the chain lock 5-1 is connected with the dynamometer 3, the lower end of the chain lock 5-1 is connected with two shackles 5-2, and the two shackles 5-2 pass through two lifting rings The screw 5-3 is connected with the upper surface of the ring 4-2.

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Abstract

The invention discloses a method for assembling a large-diameter tooth-shaped thread ring of a high-pressure main steam valve of a steam turbine, and relates to an assembling method of tooth-shaped thread rings. The method aims to solve the problems that the assembling gap between the thread ring of the steam turbine and a valve casing of the steam turbine is small so that the thread ring and the valve casing cannot be installed in the installation process, or threads of the valve casing are prone to galling in the assembling process and then the buttress threads are damaged, and the assembling efficiency is not high. The method comprises the following specific steps that 1, a 3M cyclone brush is connected to a pneumatic tool to clean threads of the thread ring and the threads of the valve casing; 2, a flange of the valve casing faces upwards and is clamped stably through a special clamp; 3, starting positions of the threads of the thread ring and the valve casing are marked, the large-diameter buttress thread ring is lifted to the position right above the valve casing and is centered through a crane, torque values, displayed on a dynamometer, of the thread ring and a lifting tool are recorded, and the thread ring is slowly dropped to the position 100mm away from the horizontal position of the threads; and 4, the thread ring is screwed into the valve casing from the starting positions. The invention belongs to the field of steam turbines.

Description

technical field [0001] The invention relates to a method for assembling a toothed threaded ring, in particular to a method for assembling a large-diameter toothed threaded ring of a high-pressure main steam valve of a steam turbine, belonging to the field of steam turbines. Background technique [0002] The assembly structure of the high-pressure main steam valve casing of the steam turbine adopts the structural form of pressing the inner sleeve of the valve core through a large-diameter serrated thread ring. The diameter of the thread ring reaches φ850mm, and the thread type is a sawtooth structure with a pitch of 20mm and a tooth depth of 10mm. One side is a 90° straight face, and the other side is a 45° bevel. The assembly gap between the threaded ring and the valve casing is small, and it is easy to fail to install the threaded ring and the valve casing during the installation process, or the thread of the valve casing is rough during the assembly process, resulting in d...

Claims

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Application Information

Patent Timeline
29 Dec 2017
Publication
CN107520602A
IPC
B23P19/06
CPC
B23P19/06
Inventors
孙忠民; 贾春艳