JPH045958B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is characterized in that the wax sealed in the body, which serves as a temperature-sensing part, increases the pressure by increasing the temperature.
This invention relates to an improvement in a wax thermoelement that operates in such a way that a piston fitted into a guide tube continuous with a body is pushed out.

[Prior Art] As shown in FIG. 1, the wax thermoelement A has a case-shaped body 1 which includes:
A guide cylinder part 2 filled with a wax w selected to melt and expand at a desired temperature and connected to the body 1 under pressure due to the expansion of the wax w.
In order to make the operation of the piston 3 due to the pressure of the expanding wax correspond accurately to the set temperature set by the selection of the wax, The pressure of the waxes is not directly transmitted to the piston 3, but is once transmitted to a fluid 4 with good fluidity, and the piston 3 is actuated by the flow of the fluid 4. Therefore, the waxes filled in the body 1 As shown in FIG. 1, w is a guide cylinder part that is sealed and enclosed with a diaphragm 5 that covers the opening 1a of the body 1, and that the diaphragm 5 is crimped onto the body 1 by joining its base end to the outside. 2, a fluid 4 with good fluidity is sealed in the enlarged diameter proximal end lumen of the guide cylindrical portion 2, and a rubber piston 6 and By sealing with a Teflon plate 7 and inserting the piston 3 on the outside of the plate 7, the expansion of the wax w in the body 1 is transmitted to the fluid 4 with good fluidity via the diaphragm 5, and the fluid 4 is The piston 3 is configured to be pushed out by the movement.

Moreover, the waxes loaded into the body 1,
In order to ensure the sealing by the diaphragm 5, in order to avoid leakage from the peripheral part of the sealed diaphragm 5 and mixing with the fluid 4 when it melts and expands due to temperature rise,
A rib 50 is integrally and continuously provided on the periphery of the diaphragm 5, and the rib 50 on the periphery of the diaphragm 5 is inside the fitting recess 20 formed on the bottom surface of the base end of the guide tube 2. I'm trying to embed this information closely.

[Problems to be Solved by the Invention] The wax thermoelement A configured as described above has a diaphragm 5 with a periphery in order to ensure sealing of the wax by the diaphragm 5. Rib 50 to form
Strict precision is required in the shape and processing of its peripheral surface, making the manufacturing process extremely troublesome.

The present invention was made to solve this problem, and it is possible to obtain a reliable seal against the highly fluid fluid 4 of the wax filled in the body without requiring troublesome machining or precision. The purpose is to provide new means.

[Means for Solving the Problems] In the present invention, as a means for achieving this object, a wax selected to melt and expand at a desired temperature is placed inside a case-shaped body. In a wax thermoelement, a piston fitted into a guide tube continuous with the body is pushed out by the pressure caused by the expansion of the wax loaded in the body. Alternatively, the fluid may be sealed in a bag made of a film or the like, loaded into the body together with the bag, and brought into contact with the fluid sealed in a guide tube to be assembled to the body via the outer peripheral surface of the bag. It proposes a wax thermoelement that

[Example] Next, an example will be described in detail with reference to the drawings. Note that the same reference numerals in the drawings as in the conventional means are used for constituent members having the same effect.

FIG. 2 is a vertically sectional front view of a wax thermoelement A in which the present invention can be carried out. In the figure, 1 is a case-shaped body, w is wax loaded into the body 1, and 2 is a base end thereof. The guide cylinder part 2a is fitted into the opening part 1a of the body 1 and caulked to the body 1, 3 is a piston that can be inserted into and inserted into the guide cylinder part 2 freely, and 4 is the enlarged diameter base end of the guide cylinder part 2. A fluid with good fluidity is sealed in the inner cavity of the portion 2a, 6 is a rubber piston fitted in the guide cylinder part 2, and 7 is a Teflon plate fitted in the guide cylinder part 2 in an overlapping manner on the outside of the rubber piston 6. It shows.

The waxes w loaded into the inner cavity of the body 1 are placed in a bag 8 (or bag body) formed of a flexible sheet or film made of a flexible material such as synthetic resin or rubber. As shown in FIG. 3, the bag 8 is filled in a molten and expanded state, and the inside of the bag 8 is evacuated to a vacuum.
The opening 80 of the bag 80 is sealed by heat welding or the like, so that when the wax w solidifies and contracts due to a drop in temperature, the bag 8 is compressed by the volume of the wax w that has contracted, as shown in Fig. 4. In this state, it is loaded into the body 1.

The opening 1a of the body 1 is left open without the diaphragm 5, and the bottom surface of the proximal end 2a of the guide tube 2 is brought into contact with the lip of the opening 1a, And, on the joint surface, O
A ring 9 is interposed and the O-ring 9 seals.

Furthermore, the highly fluid fluid 4 sealed in the inner cavity of the proximal end 2a of the guide tube 2 is brought into direct contact with the outer peripheral surface of the bag 8 so as to wrap around the outer circumference of the bag 8. Body 1 from the lumen of part 2
It is enclosed so that it spans the lumen of the tube.

In addition, a bag 8 that seals the wax w.
The shape and structure may be arbitrary, such as a bellows shape, and the material may be selected as desired, such as a metal plate.

[Operation] The embodiment device configured as described above operates as follows.

When the temperature of the outer periphery of the body 1 serving as the temperature sensing part is lower than the set temperature set by selecting the composition of the waxes w, the waxes w are in a solidified and contracted state, and the piston 3 is thereby retracted. is in a state of

In addition, when the temperature of the waxes w rises above the set temperature due to an increase in the temperature around the outer circumference of the body 1, the waxes w
melts and expands to push and expand the bag 8, and its pressure pushes the fluid 4 up into the inner cavity of the guide tube 2, thereby pushing out the piston 3.

At this time, the O-ring 9 interposed in the contact surface between the bottom surface of the base end 2a of the guide cylinder 2 and the mouth edge of the opening 1a of the body 1 reliably prevents leakage of the fluid 4 from the contact surface. It becomes like this.

[Effects of the Invention] As explained above, the wax thermoelement according to the present invention has a case-shaped body filled with wax selected to melt and expand at a desired temperature. In this wax thermoelement, a piston fitted into a guide tube continuous with the body is pushed out by the pressure generated by the expansion of the body. The bag is loaded into the body together with the bag, and the bag is brought into contact with the fluid sealed in the guide tube that is attached to the body through the outer peripheral surface of the bag. Inflation and deflation are carried out in a state enclosed within the bag (or sac), and the fluctuations in pressure due to the expansion and contraction cause the expansion and contraction of the bag, which in turn causes the fluid to flow in contact with the outer periphery of the bag. Because you will be able to convey
It is possible to omit the need for a diaphragm to isolate waxes and fluids with good fluidity, and eliminates the troublesome precision machining required to manufacture the diaphragm.
A wax thermoelement that operates accurately can now be obtained.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a conventional wax thermoelement, Fig. 2 is a longitudinal sectional front view of a wax thermoelement in which the present invention can be implemented, and Fig. 3 is a longitudinal sectional view of a bag containing the same wax. FIG. 4 is an explanatory diagram of the same effect as above. Explanation of drawing symbols, A...Wax thermoelement, 1...Body, 1a...Opening, 2...Guide cylinder part, 2a...Base end, 20...Fitting recess,
3... Piston, 4... Fluid, 5... Diaphragm, 50... Rib, 6... Rubber piston, 7...
...Teflon plate, 8...Bag (or sac), 80...
...opening, 9...O-ring, w...wax.

Claims (1)

[Claims] 1 A wax selected to melt and expand at a desired temperature was loaded into a case-shaped body, and the wax was inserted into a guide tube continuous with the body under pressure due to the expansion of the wax. In a wax thermoelement that pushes out a piston, the wax to be loaded into the body is enclosed in a bag made of a flexible sheet or membrane, and the bag is loaded into the body, and the outer periphery of the bag is A wax thermoelement, characterized in that the wax thermoelement is brought into contact with a fluid sealed in a guide cylinder part assembled to the body through a surface thereof.