JPH01107974A - Sealing structure in sample room - Google Patents

Abstract

PURPOSE:To obtain a joint part having high workability and high reliability by using a flange shape which is additionally improved in sealability for the flange structural part of the parts constituting a sample chamber in the sample chamber where steam hermeticity is required. CONSTITUTION:The respective parts of the sample chamber are connected by the flange structure. A wave shape or semicircular shape is formed at the mid-point of the flange parts and a sealant or sealing tape having electrical conductivity is held in place between the flange part and spot welding is executed. The sealant which is an anaerobic sealant and cures when the flanges are superposed to shut off air is preferable. This sealant improves hermeticity and weld strength. The hermeticity is improved and the flatness of the flange parts is maintained much higher by providing the molded shape at the mid-point of the flanges. The joint part having low welding strains and high workability as well as the high reliability is thereby obtd.

Description

[Detailed Description of the Invention] [Field of application outside of business] The invention relates to backing structures such as sample chambers that require internal vapor tightness, and in particular to flange structures and seal structures that improve their airtightness. It is related to.

[Conventional technology]

Conventional devices use a sealing method using a sealing material and a connecting plate as described in Utility Model Publication No. 51-38177 No. 1c, or a sealing method using a seal and a fastening metal fitting as shown in Equity No. 1@47-4231. The mainstream was to provide airtightness with separate parts such as In addition, a method is generally used in which the flange surface is directly bonded to a bath over the entire circumference or spot welded and then caulked with a sealing material.

[Zhao point that the invention is trying to solve]

The above-mentioned conventional technology does not give any consideration to viability or cost. In other words, in order to have sealing properties, a VT-like gasket is used, or the end face of the seal S is entirely welded to provide a seal inside the shell, or the joint part F is caulked with a sealant after spot welding. With the ``ru'' method, there are many problems in terms of productivity and cost, such as long working hours and high component costs.In addition, there are problems with airtightness for products other than all-around welded structures. there were.

An object of the present invention is to easily obtain a 7-hole structure with excellent airtightness.

[Means for solving problems]

The above purpose is the sample chamber:! i- Constituent parts (canned goods)
The flange part of the flange is formed into a corrugated or semicircular shape, a conductive sealant or sealing tape is sandwiched between the flange parts, and the illumination is welded, which is achieved by using this seven-lunge structure.

[Effect]

The sample chamber is made up of 4 to 5 canned products, and the joints pose a problem in terms of airtightness. These joints generally have a 7-lunge structure, and are spot welded to provide the strength of a zero structure. On the other hand, the airtightness of this part can be achieved by sandwiching a sealing agent or a sealing tape between the flange structure, but the flat seven-lunge structure does not have sufficient airtightness and causes local leakage. For this reason, if a semicircular or wavy shape is press-formed on both 7-flange surfaces of the 72-nge structure, and the above-mentioned sealant or sealing tape is placed at the joint and spot welded, the flatness of the 7-2 angular surfaces will be further improved. At the same time, since the gaps can be made narrow and uniform, a 72-inch structure with excellent airtightness can be obtained.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail. Figure 1 shows the external structure of the sample chamber. The sample chamber consists of bottom plate 1 and side plates 2 and 3.
and each part of the back plate 4, and each part is generally connected in a seven-lunge structure. A typical structure of a 7-lunge joint is shown in Figure 2.

(A) and (→ in Figure 2) seal the entire circumference of the end face with TIG or seal welding, but in this case, the airtightness is excellent, but the welding process takes a lot of man-hours and the welding heat Distortion and deformation of the product due to this also becomes a problem.

In Fig. 2, f-1 is a method in which the flange portion is fixed by spot welding, and then the gap between the joints is caulked with a sealant such as silicone. Although there is no thermal deformation due to welding and the workability is excellent, the long-term reliability of the seal part is inferior to 0) and (b). On the other hand, there is a method in which a sealing agent or sealing tape is applied to the flange and welded at pinch points. This is the same spot welded structure as C→, and the airtightness, which was a drawback of C→, has been improved.
This was improved by sandwiching a sealing agent and sealing tape between the 7 lunges that has electrical conductivity and is capable of spot welding. The sealant used here is preferably an anaerobic sealant that hardens when the flanges are overlapped to block air, and it is possible to improve not only airtightness but also spot welding strength by 20 to 30 inches.

Seal tape is made by mixing conductive iron powder into the tape, which foams and expands when heated to fill the gap between the flanges. Using this tape, it is possible to seal gaps of up to 1ff.

The flange structure 83 according to the present invention further improves the airtightness of the structure described in (9). In other words, in the flat 7-lunge structure shown in Figure 2), the flange part must have a high degree of flatness. The sealing agent and sealing tape are sandwiched between them. Furthermore, by molding these shapes, the flatness of the flange portion can be maintained even higher. FIG. 3 is an example, and the same effect can be obtained by using other structures in which the shape changes in the middle of the hood and the gap narrows.

The effects of this embodiment will be specifically described. By using the conventional method shown in Fig. 2 at an internal pressure of 0.1 phantom/3 (the leakage amount in 9 is about 10 cc/sec, which is shown in Fig. 2), it was possible to achieve a leakage rate of about 5 cc/sec. On the other hand, if the structure of FIG. 3 of the present invention is used, it is possible to reduce the leakage f to zero.

On the other hand, in terms of workability, it is about 1 compared to the conventional figure 2 (c).
It can be manufactured in 72 man-hours, greatly improving productivity. Figure 2
(A) Compared to f (B), the man-hours are only about 1/2 to 1/3, and the amount of distortion due to welding is almost non-problematic, so there are concerns about (A) and (B) in Figure 2. There is no need to worry about product deformation or residual stress cracking caused by residual stress.

〔Effect of the invention〕

According to the present invention, it is possible to obtain a highly reliable joint with low welding distortion and high workability in a 72-inch joint structure such as a sample chamber.

[Brief explanation of the drawing]

Figure 11g1 is an external structural diagram of a sample chamber showing an embodiment of the present invention. Figures 2 (0) (b) and (c) show joint structures commonly used at present. Figure 3 (1) (b) (-
C) shows the joint structure of an embodiment of the present invention. 1...Bottom plate 2...Side plate 3...Side plate 4
...Back plate A...Joint part 6...Sealant or seal tape. First prize

Claims (1)

[Claims] 1. In sample chambers such as environmental test equipment or constant temperature/humidity chambers that require vapor tightness, seals or seal tapes are used at the joints of sample chamber components, and seals are placed on the flange structures that spot-fix them. A seal structure in the sample chamber characterized by the use of a flange shape with further improved properties.