JPH02308980A - Thermo-wax device - Google Patents

Abstract

PURPOSE:To prevent the deterioration of the operation precision of a thermo- wax device by sticking opening section end faces of a case and a cover at the periphery outside of a diagram with an adhesive having a three-layer structure. CONSTITUTION:A thermo-wax device has a case 1, a diaphragm 2 and a cover 3. The opening section end face of the case 1 and the opening section end face of the cover 3 are stuck at the periphery outside of the diaphragm 2 with an adhesive 9. This adhesive 9 has a three-layer structure consisting of an intermediate layer 9a made of a high-elasticity adhesive and high-strength adhesives laminated on both sides of the intermediate layer. Even if the increase and decrease of the inner pressure of the thermo-wax device are repeated, the intermediate layer 9a is elastically deformed and absorbs distortion. The periphery of the diaphragm 2 is prevented from infiltrating into the gap, the protruded quantity of a piston rod is not changed, and the deterioration of the operation precision of the thermo-wax device can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a thermowax device, and more specifically, the present invention relates to a thermowax device, in which the inside is filled with a thermally expandable body and a semi-fluid, and the two are separated by a diaphragm. This invention relates to a thermowax device in which a piston rond is moved forward and backward by expansion and contraction.

[Prior art] As this type of conventional technology i4.1, Utility Model Application No. 57-9913
The Mowax apparatus disclosed in Japanese Patent No. 8 is shown in FIG. The device includes a bottomed cylindrical case 1 having an opening at one end, a diaphragm 2 covering the opening of the case 1, and a cover 3 attached to the opening end of the case 1. is held between the upper end surface of the opening of the case 1 and the lower end surface of the opening of the cover 3, and the inside of the case 1 is filled with a thermally expandable body 4. Further, the cover 3 has a hollow space 3a opened at the lower end and a sliding hole 3b communicating with the hollow space 3a, and the sliding hole 311 has a piston ring 5 projecting from the upper end opening. , a play 1-6 and a rubber plate 7 are slidably fitted.

A space 3a defined by the rubber plate 7 and the diaphragm 2 is filled with a semi-fluid 8, and the rubber brakes 1 and 7 prevent leakage to the outside of the cover 3.

As shown in an enlarged view in FIG. 4, a caulking tongue piece 3c is hung from the lower end of the cover 3, and a caulking tongue piece 3c
An engagement recess 3d is formed therein. On the other hand, a retaining step 1a is protruded from the outer periphery of the upper part of the opening end of the case 1, and the cover 3
is fixed to the case 1 by engaging the engagement step 1a with the engagement recess 3d and caulking the tongue 3c to the lower end of the engagement step 1a.

The conventional thermowax device has the above-mentioned configuration, and when the thermal expansion body 4 and the semi-fluid body 8 expand and contract in response to heat applied from the surroundings of the device, and their volumes change, the rubber piston 7 and the plate 6 The piston rod 5 slides in the vertical direction in the drawing through the piston rod 5, and an actuated member (not shown) connected to the protruding end of the piston rod 5 is actuated.

(Problems to be Solved by the Present Invention) By the way, a bias spring is usually attached to the actuated member operated by a thermowax device, and the spring force is as shown in Fig. 3 for the bias spring 5. The spring force acts in the direction indicated by arrow A, and the magnitude of this spring force is proportional to the protruding dimension of the protruding end of the piston rod 5.

Therefore, when the piston rod 5 slides against the spring force, the cover 3 moves in the direction shown by arrow B in FIG. 3 in proportion to the amount of protrusion, and the case 1 moves in the direction shown by arrow C. A spring force acts on the Therefore, 6 pieces 3 (
is elastically deformed, and as shown in an enlarged view in FIG. The peripheral edge of the diaphragm 2 is pushed into this gap S by the internal pressure of the waxing device.

Once pushed in, the internal pressure at the periphery of the diaphragm 2 decreases,
Even after the elastic deformation of the caulking tongue piece 3c is recovered, it remains held between the gap S. Furthermore, when the internal pressure of the Sumowax device is repeatedly increased and decreased, the amount of penetration of the diaphragm 2 gradually increases.

As a result, the thermal expansion body 4 and the semi-fluid body 8 of the diaphragm 2
The volume of the part in contact with the piston rod 5 decreases, and the internal volume of the case 1 and the internal volume of the cavity 3a of the cover 3 increase accordingly, so the protruding dimension of the piston rod 5 decreases and the operating accuracy of the thermowax device decreases. do.

In view of this, an object of the present invention is to provide a thermowax device that can prevent a decrease in operating accuracy due to the formation of a gap around the diaphragm.

[Means for Solving the Problems] In order to achieve the above object, the present invention fills a bottomed cylindrical case with an opening at one end with a thermal expansion body and covers this opening with a diaphragm. A cover is attached to the opening of the case, and the periphery of the diaphragm is held between the end face of the opening and the end face of the opening of the cover, and screws I are attached to the cover.
- a thermowaxing device in which a piston rod is slidably assembled and a semi-fluid is filled in a space defined in the cover by one end surface of the piston rod and the diaphragm; The end face of the opening of the case and the end face of the opening of the cover are bonded via an adhesive consisting of at least three layers: an intermediate layer made of a high elastic adhesive and an outer layer made of a high strength adhesive laminated on both sides of this intermediate layer. It is characterized by being glued.

[Operations and Effects of the Invention] According to the above configuration, even if the internal pressure of the thermowax device is repeatedly increased or decreased, the intermediate layer elastically deforms and absorbs the strain, so that both outer layers, the end face of the case opening, and the cover opening The adhesive durability of the adhesive portion of the end face is greatly improved, and it is possible to prevent a gap from forming between the end faces of both openings. Therefore, since there is no risk of the peripheral edge of the diaphragm entering the gap, the amount of protrusion of the piston rod does not change, and a decrease in the operating accuracy of the thermowax device can be prevented.

[Embodiment]' The present invention will be explained below based on the drawings. Figs. 1 and 2 show enlarged views of a thermowaxing apparatus according to an embodiment of the present invention. The device includes a case 1, a diaphragm 2 covering the opening of the case 1, and a cover 3 attached to the opening of the case 1 so as to sandwich the periphery of the diaphragm 2. The opening end face of the case 1 and the opening end face of the cover 3 are bonded with the adhesive 9, and the annular protrusion 1b provided at the periphery of the opening of the case 1 prevents the applied adhesive 9 from leaking outside. are doing. This adhesive 9 includes an intermediate layer 9a made of a highly elastic adhesive such as a rubber adhesive or an elastomer adhesive, and a high-strength, high-rigidity adhesive such as an epoxy, phenol, or acrylate adhesive laminated on both sides of this intermediate layer. It has a three-layer structure including outer layers 9b and 9b made of adhesive.

The other configuration of this embodiment is the same as that of the conventional thermowax apparatus shown in the third article and FIG.

This embodiment has the above-mentioned configuration, and since the case l and the end face of the open L1 part of the cover 3 are bonded with the adhesive 9 having a three-layer structure, even if the internal pressure of the thermowax device is repeatedly increased or decreased, the intermediate layer The strain is absorbed by the elastic deformation of 9a. Therefore, both outer layers 9h, the opening end face of the case 1, and the cover
3 The durability of the adhesive on the edge of the opening has been significantly improved,
It is possible to prevent a gap from forming between the end faces of both openings for a long period of time.

Therefore, there is no risk of the volume of the portion of the diaphragm 2 in contact with the thermally expandable body 4 and the semi-fluid body 8 decreasing due to the peripheral edge of the diaphragm 2 entering the gap, so the amount of protrusion of the piston rod 5 does not change, and the thermostatic It is possible to prevent the operating accuracy of the wax device from decreasing.

[Brief explanation of the drawing]

1 and 2 are enlarged sectional views of essential parts of a thermowaxing device according to an embodiment of the present invention, FIG. 3 is a vertical sectional view showing the overall configuration of a conventional thermowaxing device, and FIG. 4 is a diagram of the same device. FIG. 3 is an enlarged cross-sectional view of main parts.

Claims (1)

[Claims] A bottomed cylindrical case with an opening at one end is filled with a thermal expansion body, and this opening is covered with a diaphragm. A cover is attached to the opening of the case, and the end face of the opening and the opening of the cover are fitted. The peripheral edge of the diaphragm is held between the end faces of the piston rod, and the piston rod is slidably assembled to the cover, and a semi-fluid air is inserted into the cavity defined in the cover by one end face of the piston rod and the diaphragm. In a thermowax device filled with a body, an intermediate layer made of a high-elastic adhesive and a high-strength adhesive laminated on both sides of the intermediate layer are formed between the opening end face of the case and the opening end face of the cover on the outside of the periphery of the diaphragm. A thermowax device characterized in that the thermowax device is bonded via an adhesive comprising at least three outer layers.