JPH01227090A - Thermoelement and manufacture thereof - Google Patents

Abstract

PURPOSE:To facilitate grinding, by linking a small-diameter bottomed cylindrical case with the diameter same or almost same as that of a guide cylinder section on a base end side of the guide cylinder section formed into a small-diameter cylinder to fill the case with a thermosensitive substance. CONSTITUTION:A body (a) has a case 1 for sealing a thermosensitive substance 2 molded on the base end side of a small-diameter cylindrical guide cylinder section 4 into which a piston 7 is inserted slidably with a heat conducting metal material, in such a manner that it is formed in the same diameter as the guide cylinder section and linked integral to the guide cylinder section 4 to extend the section 4. Then, a bottom plate 8 is also molded being linked integral to the case 1 so as to form the case as a bottomed cylinder as being linked long axially with an outer diameter of the small-diameter guide cylinder section 4. Then, a varnishing ball B is mounted at the tip of a support material 9 to be press fitted into an internal cavity of the guide cylinder section 4 thereby facilitating grinding and finishing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement in a thermoelement in which a piston is extruded by thermal expansion of a temperature-sensitive substance sealed in a case serving as a temperature-sensing part, and a method for manufacturing the thermoelement. It is related to.

Previously, the above-mentioned thermoremen) A was
Usually, as shown in Fig. 1, a bottomed cylindrical case l made of a metal material with good thermal conductivity is filled with a temperature-sensitive substance 2 that expands in volume when the temperature rises, such as wax. 1
A diaphragm 3 is placed over the open opening of the diaphragm 3 to seal it, and the base end of a guide cylinder portion 4 having a small inner diameter is brought into contact with the diaphragm 3.
Its proximal end is integrally caulked with the circumferential wall 10 of the open opening of the case l, and it is assembled into the case 1, and the fluid flow A rubber piston 60 and a sealing member 6 such as a Teflon plate 61 are inserted into the inner cavity of the body of the guide cylinder 4 to seal the fluid 5, and the base end of the piston 7 is sealed from the outside. Either the sides are slidably inserted, or, as shown in Fig. 2, the case l is formed into a bottomless cylindrical shape and the inner diameter is reduced on the tip side. A body a is formed by integrally and continuously molding the guide cylinder part 4, and a temperature-sensitive substance 2 such as wax is stuffed into the case 1 from the open opening on the bottom side of the case l, and the temperature-sensitive substance 2 such as wax is filled into the open opening. The separately formed bottom plate 8 is attached to the 0 ring 8o.
into the peripheral wall 1 of the opening on the bottom side of the case l.
1, and a rubber piston 60 and a sealing member 6 such as a Teflon plate 61 are fitted into the inner cavity of the guide cylinder 4 to seal the temperature-sensitive substance 2, and the proximal end of the piston 7 is inserted from the outside. It is slidably inserted and assembled into the thermoelement A, and the diaphragm 3 and fluid 5 are omitted.

The thermoelement A configured in this manner has restrictions on miniaturization due to the relatively large diameter of the case 1, and cannot be applied in cases where only an extremely small space can be taken up for installation. In addition, since the case l and the guide cylinder part 4 are formed separately and assembled into one body, the manufacturing cost increases. Even if the body a and the bottom plate 8 are formed separately, the bottom plate 8 is fitted into the bottom of the case l to be opened and crimped together. become,
There is an unavoidable problem of increased production costs.

The former problem arises in thermoremenu A of this form, in which the volume expansion due to temperature rise of the temperature-sensitive substance 2 sealed in the case 1 is absorbed by the piston 7, which is slidably inserted into the guide cylinder part 4. This is because it is said that the ratio of the cross-sectional area of the temperature-sensitive substance 2 and the cross-sectional area of the piston 7 must be increased in order to increase the amount of elongation of the piston 7 by enlarging and transmitting the movement in and out. Moreover, the latter problem is caused by the finishing of the inner circumferential surface of the guide cylinder part 4 in order to smoothly move the piston 7 in and out of the guide cylinder part 4 in the axial direction. This is due to the fact that there is a demand for a cylindrical shape that penetrates through the tube.

The present invention was made in order to solve these problems occurring in the conventional means, and the present invention has been made in such a way that the thermoelement has an outer diameter that is not different from the outer diameter of the guide tube into which the piston can be inserted. To provide a new means for miniaturization, and to form a case and a guide tube in a continuous state without removing the bottom of the case, thereby reducing production costs and allowing smooth movement of the piston in and out. The purpose is to provide new means.

Therefore, the present invention was completed based on the knowledge obtained through various studies and experiments in order to solve the above-mentioned problems. That is, in case 1, which is a constraint for downsizing, the guide cylinder portion is However, this gave rise to the preconceived notion that the case 1 had to be formed with a much larger diameter than the guide tube 4, and the temperature-sensitive material Even in the case where a small amount of expansion is enough to transmit the thermal expansion to the piston 7 without increasing it, it is possible to form the case 1 to have a much larger diameter than the guide cylinder portion 4 and assemble the thermoelement A. This is the reason why it is impossible to downsize the piston 7, and for thermoelements that are required to be downsized, the amount of elongation of the piston 7 may be small in many cases, and the case 1 is no different from the guide cylinder section 4. I came up with the idea that it would be possible to reduce the diameter to the outer diameter, and
By configuring the thermoelement in this way, the result was obtained that it did not cause any functional problems.

In this way, when configuring Salmonilemen) A,
The case 1 and the guide cylinder part 4 are formed into one continuous cylindrical body a, and the case l is formed with a bottom plate 8 on the bottom side.
If the guide cylinder part 4 is molded into a continuous cylinder shape with a bottom to reduce manufacturing costs, it becomes difficult to finish polishing the inner circumferential surface of the guide cylinder part 4. The inner peripheral surface of the guide cylinder part 4 is finished by fixedly supporting it at the tip of a support member that can be inserted into and removed from the inner cavity of the guide cylinder part 4, and press-fitted into the inner cavity of the guide cylinder part 4. By extracting the support member and taking out the honey 2 single pole to the outside after finishing finishing the peripheral surface, the inner peripheral surface of the guide cylinder part 4 can be finished without any trouble.

Also, at this time, the vanishing ball is press-fitted into the inner cavity of the guide cylinder part 4 using a pushing member, and when the finishing process of the inner circumferential surface of the guide cylinder part 4 is completed, the vanishing ball is inserted into the guide cylinder part 4. 4 into the case 1 that is continuous with the case 1, and drop it into the bottom of the case 1,
By filling the temperature-sensitive substance 2 into the case l from the guide cylinder part 4 side in this state, the inner peripheral surface of the guide cylinder part 4 can be polished and finished without any trouble. This is because of the results obtained.

From this, in the present invention, as a means for achieving the above-mentioned object, a guide tube formed in a small-diameter cylindrical shape has a guide tube having the same diameter or approximately the same diameter on the proximal end side of the guide tube. The small diameter case formed into a cylindrical shape at the bottom is integrated and continuous,
The case is filled with a temperature-sensitive substance such as wax, and a thermo-element is created in which the proximal end of the piston is slidably inserted into the guide tube. A bottomed cylindrical case with the same diameter or approximately the same diameter as the guide cylinder is integrally formed on the proximal end of the cylinder, and the inner peripheral surface of the guide cylinder is pressed with a vanishing ball. After polishing and finishing the piston, a temperature-sensitive substance such as wax is loaded into the case from the guide tube, and then the base end of the piston is slidably inserted into the guide tube and assembled into a thermoelement. A method of manufacturing a thermoelement characterized by a method of manufacturing a thermoelement, in which a bottomed cylindrical case having the same diameter or approximately the same diameter as the guide cylinder part is integrally and continuously molded on the proximal end side of the guide cylinder part, and the guide cylinder part thereof is formed continuously. After polishing the inner circumferential surface of the case by pressing a vanishing ball, the vanishing ball is dropped into the bottom of the inner cavity of the case.Then, a temperature-sensitive material is packed into the case from the guide cylinder, and then the guide cylinder is inserted into the case. The present invention proposes a method of manufacturing a thermoelement, which is characterized in that the proximal end of a piston is slidably inserted into the thermoelement and assembled into a thermoelement.

Next, embodiments will be described in detail with reference to the drawings.

FIG. 3 is a longitudinal sectional front view of a thermoelement A in which the present invention can be carried out. 6 indicates a sealing member consisting of a rubber piston 60 and a Teflon plate 61, and 7 indicates a piston.

The body a is made of a metal material with good thermal conductivity, and the piston 7
A small-diameter cylindrical guide tube portion 4 that can be slidably inserted into the
A case 1 in which a temperature-sensitive substance 2 is enclosed is formed on the base end side of the case 1 to have the same diameter as the guide cylinder part 4, and is integrally and continuously molded so as to extend the guide cylinder part 4, and By integrally and continuously molding the bottom plate 8 in the case l, as shown in FIG. It is.

As shown in FIG. 4, the inner circumferential surface 40 of the guide cylinder part 4 is used to attach and support the vanishing ball B to the tip of the support member 9. By press-fitting into the inner cavity of the portion 4, a polishing finish is performed.

Guide cylinder part 4 by pushing this vanishing ball B
The polishing of the inner circumferential surface 40 of the case 1 is only required at the portion where the proximal end of the piston 7 is slidably inserted, and the inner circumferential surface of the case 1 comes into contact with the temperature-sensitive substance 2 to be packed. There is no need to go so far as to.

In addition, in the actual polishing work, a vanishing ball B whose outer diameter is slightly larger than the inner cavity of the guide cylinder part 4 is pressed so as to expand the inner cavity of the guide cylinder part 4. It is only necessary to forcefully press fit into the inner cavity, and it is sufficient to press fit once.
The process is completed by pulling out the burnishing ball B. Next, inside the body a whose inner circumferential surface 40 has been polished, a wax selected to undergo a phase change and volumetric expansion at a desired temperature is applied. The temperature-sensitive substance 2 is stuffed from the open opening at the tip of the guide cylinder 4 toward the inner cavity of the part that will become the case 1, and then a rubber piston 60 and a Teflon plate are packed into the inner cavity of the part that will become the guide cylinder 4. 61 and the like, and the proximal end of the piston 7 is slidably inserted from the outside thereof, thereby assembling the thermometer A).

Next, FIG. 5 shows a modification of the above-described embodiment.

In this embodiment, a small-diameter cylindrical guide tube 4 and a bottomed cylindrical case 1 are integrally formed of a metal material with good thermal conductivity, and the inside of the guide tube 4 is formed continuously. The circumferential surface 40 is polished by press-fitting the vanishing ball B supported by the support member 9, and then the temperature-sensitive substance 2 is packed into the case 1, and the base end side of the piston 7 is guided through the seal member 6. The method of fitting into the cylindrical part 4 is the same as in the embodiment shown in FIG. In this case, the case 1 is formed to have a somewhat larger diameter than the guide cylinder part 4, and the inner cavity of the guide cylinder part 4 has a cross-sectional area of the temperature-sensitive substance 2 packed therein which is the cross-sectional area of the piston 7. 6 shows another embodiment. In this embodiment, a small-diameter cylindrical guide tube part 4 and a bottomed cylindrical case 1 are made of a metal material with good thermal conductivity and are integrally continuous to form an elongated bottomed cylindrical body. The process of assembling the thermoelement A by molding the thermoelement A, filling it with the temperature-sensitive substance 2, and inserting the piston 7 is the same as the embodiment shown in FIG. 3 above, but the molding The means for polishing and finishing the inner circumferential surface 40 of the portion of the body a that will become the guide cylinder portion 4 are different, and the processing after finishing the polishing is also different.

That is, in the inner cavity of the guide cylinder part 4 of the molded body a, there is a honey 2 single pole B whose outer diameter is somewhat larger than its inner diameter.
The burnishing ball B is pressed into the inner peripheral surface 40 using an appropriate pushing member, and the inner peripheral surface 40 is polished. By pushing the parts deeply, the case l
In this state, the temperature-sensitive substance 2 is stuffed into the case l, and then the proximal end of the piston 7 is inserted into the guide cylinder part 7 via the seal member 6, and the thermo-element is inserted into the bottom of the inner cavity. It is designed to be assembled in A.

Next, FIG. 7 shows a modification of the embodiment shown in FIG. 6 above.

In this embodiment, when a small-diameter cylindrical guide tube part 4 and a bottomed cylindrical case l are integrally and continuously molded using a metal material with good thermal conductivity, the case l is formed into a guide tube part. The only difference from the embodiment shown in FIG. 6 is that it is formed to have a diameter somewhat larger than that of the guide tube 4 of the molded body a; After finishing the polishing, the vanishing ball B is dropped into the bottom of the inner cavity of the case 1, and then the temperature-sensitive substance 2 is stuffed therein, and the base end of the piston 7 is fitted into the guide cylinder part 4 via the seal member 6, and the thermoelement A is inserted. The point that it is assembled is the above-mentioned 6th
This is the same as the embodiment shown in the figure.

Next, FIG. 8 shows a further different embodiment.

This embodiment also serves as an example of the use of the embodiment apparatus shown in FIG. 6 described above. That is, a temperature-sensitive substance 2 is packed in a case 1 formed in a cylindrical shape with a bottom, and the base end of a guide cylinder part 4 is connected to the open opening of the case 1 via a diaphragm 3.
The proximal end of the inner cavity of the guide cylinder portion 4 is filled with fluid 5, and further,
When the proximal end of the piston 7 is fitted into the body of the inner cavity of the guide cylinder part 4 via the seal member 6 and assembled into the thermometer A, the piston 7 shown in FIG. By inserting the body a of thermo element A, the thermo element A is assembled in two consecutive stages.

In this example means, the second stage thermonimembrane)A
may be the one shown in the embodiment shown in FIG. 7, or the one shown in FIG. 3 or FIG. As shown in Fig. 9, a cylindrical guide tube portion 4 and a bottomed cylindrical case l are integrally molded, and the guide tube portion 4
It is possible to use the embodiments shown in FIGS. 3 to 7 described above, in which the inner circumferential surface 40 is finished by a vanishing ball B, by molding them into a slightly larger size. Of course.

This two-stage thermoelement consists of a temperature-sensitive substance 2 sealed in the case 1 of the -stage thermoelement A, and a second-stage thermoelement AC? ) Temperature-sensitive materials 2 to be sealed in the case 1 are selected so that their operating temperatures are different, and after the -th stage thermoelectric element) A is activated, the second stage thermosensitive element) A is activated. There are cases where

As explained above, the thermoelement according to the present invention has a small-diameter cylindrical portion formed in a bottomed cylindrical shape with the same diameter or approximately the same diameter as the guide cylindrical portion on the proximal end side of the guide cylindrical portion formed in the small-diameter cylindrical shape. Since the case is continuous, the case is filled with a temperature-sensitive substance such as wax, and the base end of the piston is slidably inserted into the guide cylinder, the thermoelement to be assembled is easy to use. , the outer diameter of the thermoelement can be reduced to the same extent as the outer diameter of the guide cylinder that guides the piston in and out movement, making it possible to obtain an extremely small thermoelement.

In addition, when making this small thermo-element, a bottomed cylindrical case with the same diameter or approximately the same diameter as the guide cylinder part is integrally and continuously molded on the base end side of the guide cylinder part, and the guide cylinder part is molded continuously. By adopting a method of polishing the inner circumferential surface of the cylindrical part by pressing a burnishing ball, the case and guide cylindrical part are formed in a continuous state without removing the bottom of the case, reducing manufacturing costs. It becomes possible to easily manufacture a thermoelement that allows the piston to move in and out smoothly while reducing the temperature.

Furthermore, a bottomed cylindrical case having the same diameter or approximately the same diameter as the guide cylinder is integrally and continuously formed on the proximal end side of the guide cylinder, and the inner circumferential surface of the guide cylinder is burnished. After polishing the ball by pushing it in, the vanishing ball is dropped into the bottom of the inner cavity of the case, and then a temperature-sensitive substance is packed into the case through the guide cylinder, and then the base end side of the piston is inserted into the guide cylinder. By adopting a method of assembling the thermoelement by slidably inserting it into the thermoelement,
Polishing the inner circumferential surface of the guide cylinder portion using the burnishing ball can be made easier.

Furthermore, a small-diameter case formed in a bottomed cylindrical shape having the same diameter or approximately the same diameter as the guide cylinder part is integrally connected to the proximal end side of the guide cylinder part formed in a small-diameter cylindrical shape, and inside the case. A thermoelement case is filled with a temperature-sensitive material such as a thermosensor, and the proximal end of the piston is slidably inserted into the guide cylinder. By replacing the piston that fits into the guide tube with a two-stage thermoelement that slides in and out, the thermoelement, which extends due to the volume expansion of the enclosed temperature-sensitive substance, can be extended to a large extent. The extending action and the small and delicate extending action can be performed in two stages.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a conventional thermoelement, Fig. 2 is a longitudinal sectional front view of another conventional thermoelement, and Fig. 3 is a longitudinal sectional front view of a thermoelement according to the present invention.
The figure is an explanatory diagram of the polishing means for the inner circumferential surface of the guide cylinder part same as above, FIG. 5 is a longitudinal sectional front view of another embodiment, FIG. 6 is a longitudinal sectional side view of another embodiment, and FIG. FIG. 8 is a longitudinal sectional front view of a further different embodiment, and FIG. 9 is a longitudinal sectional side view of the same modification. Explanation of drawing symbols A...Thermo element a...Body B...Vanishing ball 1...Case 10-11...
Peripheral wall 2... Temperature-sensitive substance 3... Diaphragm
4... Guide cylinder part 40... Inner peripheral surface 5.
...Fluid 6...Seal member 60...Rubber piston 61...Teflon plate 7...Piston 8...Bottom plate 80...0 ring 9...
・Supporting member patent applicant NTC Industry Co., Ltd. No. 1
Figure A Figure 9 Figure 8 Figure 7

Claims (4)

[Claims] (1) A small-diameter case formed in a bottomed cylindrical shape with the same diameter or approximately the same diameter as the guide tube is integrally connected to the proximal end side of a guide tube formed in a small-diameter tube shape, and the case A thermoelement whose inside is filled with a temperature-sensitive substance such as wax, and the base end of the piston is slidably inserted into the guide cylinder. (2) A bottomed cylindrical case with the same diameter or approximately the same diameter as the guide cylinder is integrally and continuously molded on the base end side of the guide cylinder, and the inner circumferential surface of the guide cylinder is , polishing is done by pushing in a vanishing ball, and a temperature-sensitive substance such as wax is loaded into the case from the guide tube, and then the base end of the piston is slidably inserted into the guide tube and heated. A method for manufacturing a thermoelement, characterized by assembling it into an element. (3) A bottomed cylindrical case with the same diameter or approximately the same diameter as the guide cylinder is integrally and continuously molded on the base end side of the guide cylinder, and the inner circumferential surface of the guide cylinder is After finishing the polishing by pressing the vanishing ball, the vanishing ball is dropped into the bottom of the inner cavity of the case.Then, the temperature-sensitive substance is packed into the case from the guide tube, and then the base of the piston is inserted into the guide tube. A method for manufacturing a thermoelement, characterized by assembling it into a thermoelement by slidably inserting the end side. (4) A small-diameter case formed in a bottomed cylindrical shape having the same diameter or approximately the same diameter as the guide tube is integrally connected to the proximal end side of the guide tube formed in the small-diameter tube shape, and the case A thermoelement case is filled with a temperature-sensitive substance such as wax, and the proximal end of the piston is slidably inserted into the guide cylinder, and the guide is inserted into the separately formed guide cylinder of the thermoelement. A two-stage thermoelement that is slidably inserted in place of the piston that is inserted into the cylindrical part.