Helium mass spectrum leak detection fixture for tube plate welding seams of evaporator

A technology of evaporator tube sheet and helium mass spectrometry, which is applied in the field of mechanical devices, can solve the problems of low efficiency and high consumption of O-rings, etc., and achieve the effect of labor-saving and easy operation

Active Publication Date: 2011-12-28
广州灵帕机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, domestic manufacturers of nuclear power evaporators used manual operations to detect helium leaks on evaporators. They used O-rings to cover the bolts, and then manually inserted them into the holes one by one, and then tightened them carefully one by one. Nuts need to be loosened and pulled out one by one after the leak detection. With so many holes, it takes more than 10 people to spend a few days. The efficiency is extremely low, and more O-rings are consumed each time.

Method used

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  • Helium mass spectrum leak detection fixture for tube plate welding seams of evaporator
  • Helium mass spectrum leak detection fixture for tube plate welding seams of evaporator
  • Helium mass spectrum leak detection fixture for tube plate welding seams of evaporator

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Embodiment 1

[0023] Such as Figure 2-Figure 5 As shown, the main body of the helium mass spectrometer leak detection fixture is composed of an electric control box 1, a cylinder 2, a set of movable cores 3, a static seal ring 5, a set of dynamic seal rings 4 set on a set of movable cores 3, and a detection port 6 Composition, the fixture main body 7 is connected with the leak detector, and there is a mechanical pump inside the leak detector. According to the hole spacing and layout of the weld seam on the surface of the evaporator tube plate, the group of movable cores 3 can be designed into four, five, six, seven, eight, nine and other arbitrary activities according to the number and layout of the tube bundle holes. The number of cores, the present embodiment takes seven cores as an example to form a group of movable cores 3, which are located inside the fixture body 7 and extend out of the side end surface of the fixture, and are connected with the cylinder 2 with a connecting plate 8, ...

Embodiment 2

[0029] Such as Figure 6 As shown, in the case of keeping the above-mentioned main structure unchanged, the second embodiment takes four cores as an example to form a group of movable cores 3, which are arranged inside the fixture main body 7, and are connected with the cylinder 2 by a connecting plate 8, which can be used at the same time The shaft synchronously moves telescopically with the cylinder 2, and each movable core 3 is respectively covered with a dynamic sealing ring 4. An end face flange 10 is provided at the front end of the fixture main body 7 , and a seal groove 11 is opened on the end face of the end face flange 10 , and a static sealing ring 5 is installed in the seal groove 11 . The sealing groove 11 where the static sealing ring 5 is placed and the static sealing ring 5 adopt a curved shape according to the layout of the inspected seal welding seam on the surface of the tube sheet and the weld scars on the surface of the tube sheet, and the specific design ...

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Abstract

The invention provides a helium mass spectrum leak detection fixture for tube plate welding seams of an evaporator. The fixture comprises a gas cylinder, mobile cores, dynamic seal rings and a static seal ring, wherein the front end of the fixture is provided with an end face flange; the end face flange is provided with a seal groove; the static seal ring is arranged in the seal groove; a group of mobile cores are connected with the gas cylinder and can coaxially and synchronously do the telescopic movement together with the gas cylinder, so that the dynamic seal rings on the mobile cores arerespectively plugged up or taken off in a tube bundle hole on the surface of the tube plate of the evaporator at the same time; the end face flange and the back end of the main body of the fixture are in flexible connection by a corrugated tube; the static seal ring is tightly pressed by negative pressure generated by vacuum pumping; and the static seal ring and the seal groove both are curve-shaped according to the distribution of sealing welding seams on the surface of the tube plate and the condition of welding scars on the surface of the tube plate, and the dynamic seal rings are spindle-shaped. The fixture can quickly detect the welding quality of the sealing welding seams on the surfaces of a plurality of tube plates through the electropneumatic control over the gas cylinder and a leak detector by using an electronic control box.

Description

technical field [0001] The invention relates to a fast, high-efficiency, electro-pneumatic multi-core fixture for helium mass spectrometer leak detection on the welding point of the evaporator tube plate, and relates to the field of mechanical devices. Background technique [0002] The nuclear power evaporator is the key equipment of the nuclear power plant. Its main structure is composed of shell A, tube sheet B, tube bundle C and other components. There are multiple tube bundle holes D on the surface of the tube sheet B, and the multiple tube bundles C in the shell A are connected to the tube bundle holes D on the surface of the tube sheet B by welding. This process is called tube bundle-tube sheet sealing welding, and the weld is called sealing welding Weld E. (see figure 1 As shown), the welding quality of the sealing weld is crucial to the safe operation of the nuclear power plant. There are more than 9,000 to 20,000 sealing welds between the tube sheet and the tube b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/22
Inventor 刘安平
Owner 广州灵帕机电科技有限公司
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