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

A technology of evaporator tube sheet and helium mass spectrometer, which is applied in the field of mechanical devices, can solve the problems of consuming more O-rings and low efficiency, and achieves the effects of labor-saving and easy operation.

Active Publication Date: 2010-11-17
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 th

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 consists of an electric control box 1, a cylinder 2, a group of movable cores 3, a static seal ring 5, a group of movable seal rings 4 sleeved on a group of movable cores 3, and a detection port 6. The main body 7 of the fixture is connected with the leak detector, and there is a mechanical pump inside the leak detector. According to the hole distance and layout of the welding seam on the surface of the evaporator tube sheet, 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. In this embodiment 1, a group of movable cores 3 composed of seven cores is taken as an example. It is arranged inside the clamp body 7 and extends out of the clamp side end surface, and is connected to the cylinder 2 by a connecting plate 8 which ca...

Embodiment 2

[0029] Such as Image 6 As shown, while keeping the above-mentioned main body structure unchanged, the second embodiment takes four cores to form a group of movable cores 3 as an example. It is arranged inside the clamp body 7 and is connected to the cylinder 2 by a connecting plate 8. The shaft moves synchronously with the cylinder 2, and each movable core 3 is provided with a movable sealing ring 4 respectively. An end face flange 10 is provided at the front end of the clamp body 7, a sealing groove 11 is opened on the end face of the end face flange 10, and a static sealing ring 5 is installed in the sealing groove 11. The sealing groove 11 of the static sealing ring 5 and the static sealing ring 5 are arranged in a curved shape according to the layout of the welded seam on the surface of the tube sheet and the weld scar on the surface of the tube sheet. The specific design is a square as a whole The curved shape with curved corners (see Figure 5 ), avoid the weld scars on ...

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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 are respectively 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, efficient and electrically operated multi-core clamp used for helium mass spectrometry leak detection for evaporator tube plate welding points, and relates to the field of mechanical devices. Background technique [0002] Nuclear power evaporator is the key equipment of 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. The multiple tube bundles C in the shell A and the tube bundle holes D on the surface of the tube sheet B are connected by welding. This process is called tube bundle-tube sheet sealing welding, and the weld is called sealing welding Weld E. (See figure 1 (Shown), the welding quality of the sealing weld is very important to the safe operation of nuclear power plants. There are more than 9,000 to 20,000 sealing welds between the tube sheet and tube bundle of an evaporator, ...

Claims

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Application Information

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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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