JPS58147620A - Sealing method for sealed gas - Google Patents

Abstract

PURPOSE:To prevent the leaking of gas with a sufficient amount of liquid secured and with the operation of a sealing body secured, by using a female mold having two surfaces which are continued at the central protruded part at the bottom of a groove and a male mold, wherein a concave part is formed so that a protruded parts are provided at both side parts contacting the side walls of the groove. CONSTITUTION:At the bottom part of the groove 7a of the female mold 7, the two approximately semicircular surfaces 7c are formed so that they are continued at the central protruded part 7b. At the end surface of the male mold 8, whose width is approximately equal to the groove 7a, the circular concave part 8b is formed, so that the protruded parts 8a are contacted with the side walls 7a1 of the groove 7a. When a capillary tube 2 is placed in the groove 7a of the female mold 7 and compressed by the male mold 8, a compressed part 2a is formed in the central part of the capillary tube 2 by the protruded part 7b, and compressed parts 2b in the reverse direction are formed on both sides of the compressed part 2a by the protruded parts 8a.

Description

[Detailed description of the invention] The present invention relates to a method for sealing a sealed gas.

FIG. 1 shows an example of a thermally responsive power element, in which a capillary tube 2 is connected to a bellows 1, a temperature sensing cylinder 3 is provided at the end of the capillary tube 2, and a bellows 1 is connected to the temperature sensing cylinder 3. The gas is then filled in.

By the way, in conventional sealing at the end of the capillary tube 2, as shown in FIG. Pressure is applied to the central part by the part 5a, and plastic deformation is performed as shown in Fig. 3-4 to form a temporary fixing part A, and then another mold is used to form a part on the power element side from the temporary fixing part A. The other part was pressed off as shown in Figure 5 to form the permanent fixing part B, and then a protective solder 6 was applied to the sharp end of the final fixing part A.The steps up to this temporary fixing were as follows: Since it is a continuous process, it is not possible to include the final fixing in this process, so the final fixing has to be done as a separate process using a separate mold with sufficient strength. By the way, in this case, if the protrusion 5a of the male die 5 is not located at the center of the capillary tube 2 due to the clearance in the mold during temporary fixing, leakage will occur in the temporarily fixed product, especially in the capillary tube. This tendency becomes stronger when the wall thickness of the power element becomes thinner, and on the other hand, if the filled liquid remains in the cut-off temporary fixing part, the total amount of filled gas is small, resulting in a shortage of filled gas, and the power element It had drawbacks such as having a negative effect on the operating characteristics of the system.

The present invention has been made by focusing on the above-mentioned drawbacks,
It is possible to create a seal with sufficient strength instead of the conventional temporary fixing, and by cutting the sealing part, a sufficient amount of liquid can be secured to ensure the operation of the sealed body while allowing gas to flow. This is to prevent leakage.

FIG. 6 shows a mold used for sealing according to the present invention, and shows the female mold 7.
The bottom of the groove 7a is formed with two approximately semicircular surfaces 7c, 7c that meet at the central raised portion 7b, and the end face of the male die 8, whose width approximately matches the groove 7a, is formed with a side wall of the groove 7a. A protruding portion 13a is provided at a portion in contact with 7as.

A circular recess 8b is formed to have a circular recess 8a.

Therefore, in the above structure, when the capillary tube 2 is inserted into the groove 7a of the female mold 7 and pressurized by the male mold 8, a pressurizing part 2a is formed at the center of the capillary tube 2 by the raised part 7b, and a protruding part 8a is formed. , 8a form pressure parts 2b and zb in opposite directions on both sides of the pressure part 2a, so nailing can be ensured. And next, the sealing part C
It is then pressed out using a separate mold, and then a protective solder is applied.

As described above, the present invention comprises a female mold having two surfaces at the bottom of the groove that meet at a central protuberance, and a male mold having a concave portion with protrusions on both sides contacting the side walls of the groove. Since the capillary tube is deformed under pressure by the female mold and the male mold to seal it, the sealing is reliable, and since the sealing part is cut, the liquid volume can be reduced. The gas enclosure can be reliably operated without causing a shortage.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a power element, Fig. 2 is a cross-sectional view of a conventional temporary fixing mold, Fig. 3 is an axial cross-sectional view of a capillary tube temporarily fixed by the above method, and Fig. 4 is a cross-sectional view of a capillary tube temporarily fixed by the above method. 3 is a cross-sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a cross-sectional view of the fully fixed and cut state, FIG. 6 is a cross-sectional view of the state with protective solder applied, and FIG. 7 is a cross-sectional view of the mold for soil use according to the present invention. 8 is an axial sectional view of the capillary tube sealed as above, FIG. 9 is a sectional view taken along line IX-IX in FIG. 8, and FIG. 10 is a sectional view of the sealed body in a cut state. be. 2... Capillary tube, 7... Female type, 7a.
...Groove, 7b...Protuberance, 7c, 7c...Two faces, 8...Male type, 8a, 8a...Protrusion, 8b...
recess. Patent applicant: Saginomiya Seisakusho Co., Ltd. Figure 2 Figure 3 Figure 4rI! J 1Σ1 Figure 6

Claims (1)

[Claims] A female mold having two surfaces that meet at a central protuberance at the bottom of the groove, and a male mold having a recess formed with a protrusion on both sides contacting the side walls of the groove, and the female mold and A method for sealing a sealed gas characterized by sealing a capillary tube by deforming it under pressure using a male die.