JPH0512677B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a filler that is filled into the body of a temperature-sensitive actuating body as a thermally expandable body or as a deformable body that transmits the pressure of the body to the actuating body. Regarding.

[Prior Art] As shown in FIG. 1, the temperature-sensitive actuating body A is usually constructed by assembling a body 1 by combining a case 10 serving as a temperature-sensing part and a cylindrical guide 11 serving as an actuating part. Case 10 becomes the temperature sensing part of body 1
A thermally expandable body 2 whose volume expands and contracts according to temperature changes is filled and sealed inside, and a piston-shaped actuator 3 is placed in a cylindrical guide 11 that serves as an actuator.
is slidably inserted into the operating body 3 and the thermal expansion body 2 filled and sealed in the case 10.
A deformable body 4 whose shape can be freely deformed is filled between the thermally expandable body 2 and the thermally expandable body 2 whose volume expands as the temperature rises, and the pressure from the thermally expandable body 2 is transmitted to the actuating body 3 via the deformable body 4. As a result, the actuating body 3 is guided by the guide 11.
It is configured so that it is extruded from

[Problems to be Solved by the Invention] By the way, the thermal expansion body 2 and the deformable body 4 filled in the body 1 of the temperature-sensitive actuating body A configured as described above
For the thermally expandable body 2, wax is usually used, and for the deformable body 4, a lubricating oil such as grease or oil is used.

The thermally expandable body 2 made of wax is filled into the case 10 before assembling the body 1, and when the guide 11 is joined to the case 10 and the body 1 is assembled, a diaphragm 5 is placed on the joint surface. The deformable body 4 made of grease or the like is inserted into the base end of the guide 11 through the through hole 110 into which the actuating body 3 of the guide 11 of the assembled body 1 is inserted. A cavity 111 communicating with the through hole 110 formed on the side is filled and sealed by a rubber piston 6 and a Teflon plate 7 which are slidably fitted into the through hole 110. and Teflon plate 7
The actuating body 3, which is slidably fitted into the through hole 110, is brought into contact with the actuating body 3 from the outside through the through holes. Thermal expansion body 2 consisting of
In this case, the problem arises that sealing with the diaphragm 5 becomes difficult, and in the case of the deformable body 4,
A problem arises in which leakage occurs from the fitting surface between the through hole 110 of the guide 11 and the actuating body 3. Furthermore, since a diaphragm 5 is required to separate the thermally expandable body 2 made of wax or the like from the deformable body 4 such as grease, the structure and assembly become troublesome.

For this reason, a method of using a soft rubber-like material such as low-molecular polypropylene (APP) or unpolymerized silicone rubber for the thermally expandable body 2 filled in the case 10 of the body 1 was developed in 1988-109115. However, in the case of the former method, which uses a rubber-like material made of low-molecular-weight polypropylene, the composition of the material is a mixture of various polymers that do not become plastic. , when a certain amount is extracted, the composition differs, so the individual differences in the characteristics of the assembled temperature-sensitive working body A become large, and it is possible to assemble a temperature-sensitive working body A with constant characteristics. There are difficult problems,
Furthermore, since the diaphragm 5 is required to avoid direct contact between the thermal expansion body 2 and the deformable body 4, there remains the problem that the structure and assembly become complicated. In addition, in the case of the latter in which the thermal expansion body 2 is made of a soft rubber material such as unpolymerized silicone rubber, it does not contain a lubricating component, so when the rubber piston slides inside the guide, it is difficult to slide. There is a problem in that the sealing is poor and the soft rubber-like body itself, which is the thermally expandable body 2, leaks.

The present invention has been made to solve these problems occurring in conventional means, and by filling the case 10 of the body 1 of the temperature-sensitive actuating body A, sealing can be easily performed and The thermally expandable body 2 has homogeneous and certain characteristics, and can also be used as the deformable body 4, and can be used to substantially fill the deformable body 4 and isolate the deformable body 4 and the thermally expandable body 2. The purpose of the present invention is to provide a filling material that allows the diaphragm 5 to be omitted.

[Means for Solving the Problems] The present invention has been completed based on knowledge obtained through various experiments and studies in order to solve the above-mentioned problems. In other words, ethylene propylene rubber (EP), silicone rubber, nitro rubber, or other synthetic raw rubber with a constant composition is cut and crushed into fine particles like ground meat through a meat grinder, and the amount is enough to wrap around the particles. The mixture is mixed with lubricants such as grease and oil, and kneaded to form a semi-fluid filler similar to mayonnaise. When actuating body A was assembled and its properties were tested, it was found that the seal had a simple structure and was a thermally expandable body made of a semi-fluid filler made by mixing crushed pieces of synthetic raw rubber with a lubricant such as grease. 2. Leakage can be prevented. Moreover, the crushed pieces of synthetic raw rubber in the thermally expandable body 2 made of the kneaded semi-fluid filler expand and contract in response to temperature changes, allowing it to function stably as a thermally expandable body over a wide temperature range. I come to do it. Moreover, since the kneaded semi-fluid filler used for the thermally expandable body 2 has homogeneous properties, the temperature-sensitive actuating body A to be assembled can be a product with uniform performance without individual differences. Ta. Furthermore, the deformation and fluidity of the filler kneaded into this semi-fluid material used for the thermally expandable body 2 causes the crushed pieces of synthetic rubber inside it to move around freely due to the lubricant while being wrapped in the lubricant. Since it becomes very good, it is also suitable for use as the deformable body 4. Furthermore, from this, the filler kneaded into this semi-fluid can be used to form the thermally expandable body 2 and the deformable body 4. When the body 1 of the temperature-sensitive actuating body A is filled with the material, when the volume expands due to temperature rise, it deforms and flows and enters the through hole 110 of the guide 11, and the actuating body 3 is properly filled. It was found that the product began to perform an action of extruding. Furthermore, when mixing the crushed pieces of synthetic raw rubber with a lubricant such as grease and kneading them into a semi-fluid, the crushed pieces of synthetic raw rubber are heated to a temperature of about 290 degrees Celsius to 300 degrees Celsius, at which point they begin to melt. By doing this, the fine crushed pieces of synthetic raw rubber become particles with a smooth surface and a viscosity comparable to that of chewing gum, which improves fluidity and deformability, making the above-mentioned functions even more accurate. This is due to the fact that results were obtained that made it possible to

Therefore, in the present invention, as a means to achieve the above-mentioned object, synthetic raw rubber is finely crushed, the crushed pieces of the synthetic raw rubber are mixed with a lubricant such as grease or oil, and the mixture is The present invention provides a filling material for a temperature-sensitive actuator, which is prepared by heating the crushed pieces of the synthetic raw rubber to such an extent that they begin to melt and kneading them into a semi-fluid.

[Example] Next, an example of implementation will be described in detail with reference to the drawings. In addition,
The same reference numerals in the drawings as in the previous means shall be used for components having the same effect.

FIG. 2 is a vertically sectional front view of a temperature-sensitive actuating body A in which the present invention can be implemented. indicates a rubber piston, and 7 indicates a Teflon plate.

The body 1 includes a cylindrical case 10 with a bottom made of a metal material with good thermal conductivity to accommodate the thermally expandable body 2 and constitute a temperature sensing part, and a case 10 that holds the actuating body 3 in the shape of a piston that can be moved in and out. This is a normal type in which a guide 11 formed in a cylindrical shape and a guide 11 forming an operating part are joined together via a diaphragm 5 which also serves as a sealing member.

The thermally expandable body 2 enclosed in the case 10 of the body 1 is made by cutting a certain coarse synthetic raw rubber such as ethylene propylene rubber (EP), silicone rubber, or litrile rubber into fine particles with a particle size of about 0.1 mm.・Crush the synthetic raw rubber into crushed pieces a,
Mix enough grease (or lubricant) b in an approximately 1:1 ratio to wrap around them, and
If desired, after adding and kneading powdered materials such as carbon particles, powdered silica, and crushed plastic, heat the crushed pieces of synthetic raw rubber a to about 290 degrees Celsius to 300 degrees Celsius, where the surface begins to melt. By heating and then kneading again, the filling material M is adjusted to be a semi-liquid substance similar to mayonnaise.

The heating performed before kneading the mixture of the crushed pieces a of synthetic raw rubber and the lubricant b such as grease or oil melts the crushed pieces a of synthetic raw rubber into particles with smooth surfaces and deforms them. - This is to improve fluidity, and according to the results of experiments, the temperature is such that even if crushed pieces of synthetic rubber melt in lubricants such as grease and oil, they remain wrapped in the lubricant. Since the crushed pieces of synthetic raw rubber that have been held and melted will not adhere to each other, there is no problem even if the temperature is raised to just before the crushed pieces of synthetic raw rubber are combusted, so that they melt into a mush. do not have.

Then, this kneaded semi-fluid filler M
is filled into the case 10 before assembling the body 1, and is sealed by a diaphragm 5 which also serves as a sealing member, so that it functions as the thermal expansion body 2.

The actuating body 3 is formed in the shape of a piston and has a through hole 11 in the axial center of the guide 11 formed in the shape of a cylinder.
0 in a slidable manner. The inner end of the guide 11 is provided with the through hole 110 on the proximal end of the guide 11.
The case 10 of the body 1 is in contact with the deformable body 4 sealed in a cavity 111 formed in communication with the deformable body 4 via a rubber piston 6 and a Teflon plate 7.
The thermally expandable body 2 inside increases its volume due to temperature rise and pushes up the diaphragm 5, and due to the pressure, the deformable body 4 enters the through hole 110 of the guide 11 and protrudes from the guide 11. It's like this.

The deformable body 4 is a commonly used fluid liquid such as grease, and the actuating body 3 is inserted into the through hole 110 of the guide 11 of the assembled body 1 before being inserted into the through hole 11.
The empty space 111 in the body 1 is filled through the air.

The embodiment device constructed in this manner operates as follows.

The thermally expandable body 2 filled in the case 10 of the body 1 of the temperature-sensitive actuator A mixes the crushed pieces a of synthetic raw rubber with a lubricant b such as grease or oil, and the crushed pieces a of synthetic raw rubber mix together. Since the semi-fluid filler M is heated and kneaded to such an extent that it begins to melt, leakage can be prevented with a simple seal even if the pressure for extruding the actuating body 3 is increased.

In addition, the increase in volume due to temperature rise is mainly caused by the expansion of the crushed pieces a of the synthetic raw rubber, and the crushed pieces a of the synthetic raw rubber range from a low temperature of several tens of degrees Celsius below zero to a high temperature of about 140 degrees Celsius due to the characteristics of the synthetic raw rubber. Since the hardness will hardly change within the range of
Becomes adaptable to a wide temperature range. In addition, since the synthetic raw rubber used as the crushed pieces a is made of a constant material such as ethylene propylene rubber, the composition of the filler M used as the thermally expandable body 2 becomes homogeneous, and the assembled temperature-sensitive actuating body Make product A uniform.

Next, FIG. 3 shows another embodiment. This embodiment not only fills the case 10 of the body 1 with the above-mentioned filler M as the thermally expandable body 2 but also fills the deformable body 4 with the filler M.
This is an example in which the empty space 111 in the body 1 is filled continuously so as to serve as the same. Therefore, in this embodiment, the deformable body 4 and the diaphragm 5 are omitted, and the thermal expansion body 2 is directly connected to the actuating body 3 fitted into the guide 11 via the rubber piston 6 and the Teflon disc 7. Furthermore, the case 10 and the guide 11 on which the body 1 is assembled are joined and connected via an annular seal member 8. In this embodiment, since there is no need to separate the thermal expansion body 2 and the deformable body 4, the body 1 is formed into a cylindrical shape in which the case 10 and the guide 11 are integrally continuous, as shown in FIG. 1a may be assembled by screwing them together.

In this embodiment, in addition to functioning in the same manner as the embodiment shown in FIG. The space can be made smaller by the amount of space 111 to be filled with 4.

[Effects of the Invention] As explained above, the filler in the temperature-sensitive actuator according to the present invention can be obtained by finely crushing synthetic raw rubber and mixing the crushed pieces of the synthetic raw rubber with a lubricant such as grease or oil. By heating and kneading the crushed pieces of raw rubber to the extent that they begin to melt, the rubber is made into a clay-like semi-fluid material that has almost lost its elasticity. This filling material, which is filled into the case of the body and used as a thermal expansion body, is made to have uniform and fixed characteristics.
Individual differences in the characteristics of the assembled temperature-sensitive actuator A become large, such as when a rubber-like body mixed with a polymer such as low-molecular polypropylene or unpolymerized silicone rubber is used as a thermally expandable body. Therefore, a uniform product of the temperature-sensitive actuating body A can be obtained.

In addition, the filler is made by mixing and kneading crushed pieces of synthetic raw rubber and lubricating oil such as grease and oil, and contains a lubricating component. When used in a temperature-sensitive actuating body as a deformable body, it improves the sliding properties of the rubber piston that fits into the guide of the temperature-sensitive actuating body, improves its sealing property, and improves the filling material itself. This makes it possible to obtain a product with a temperature-sensitive actuator that prevents water from leaking and exhibits stable functionality.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a temperature-sensitive actuating body, Fig. 2 is a vertical cross-sectional front view of a temperature-sensitive actuating body in which the present invention can be implemented, Fig. 3 is a vertical cross-sectional front view of another embodiment of the same as above, and Fig. 4 is the same as above. FIG. 7 is a longitudinal sectional front view of a modification of the embodiment. Explanation of drawing symbols, A...Temperature-sensitive actuating body, M...Filler, a...Crushed pieces, b...Grease (lubricant),
1...Body, 1a...Bottom cover, 10...Case,
DESCRIPTION OF SYMBOLS 11...Guide, 110...Through hole, 111...Vacancy, 2...Thermal expansion body, 3...Working body, 4...Deformation body, 5...Diaphragm, 6...Rubber piston, 7... Teflon plate, 8...Sealing member.

Claims (1)

[Claims] 1. Finely crush synthetic raw rubber, mix the crushed pieces of synthetic raw rubber with a lubricant such as grease or oil,
A filler for a temperature-sensitive actuating body, which is obtained by kneading the mixture into a semi-fluid by heating the mixture to such an extent that the crushed pieces of the synthetic raw rubber begin to melt.