JPH0432533Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is about a wax thermoelement for automatic mixing faucets, temperature control valves, etc. that is used by being incorporated into automatic mixing faucets, temperature control valves, etc. It is about improvement.

[Prior Art] As shown in Fig. 1, a conventional wax thermoelement for an automatic mixing faucet has a case 1 made of a metal material with good thermal conductivity and formed into a cylindrical shape with a bottom. 2, a diaphragm 3 formed in the shape of a convex lid plate for sealing the wax 2 is brought into contact with the opening 10 of the case 1, and a piston 4 is slidably inserted into the outside of the diaphragm 3. 5 (or guide sleeve), and the base end 50 is formed integrally and continuously with the end of the case 1 on the opening 10 side. 6 and crimped together with the case 1, the cylinder 5 into which the piston 4 can be inserted is connected to the case 1 enclosing the wax 2, and the fluid 7 is filled in the bottom of the inner cavity of the cylinder 5. A rubber piston and a synthetic resin plate are slidably inserted from the outside to seal the fluid 7, and the piston 4 is further inserted from the outside to assemble.

In addition, as another means,
As stated in Publication No. 19282, the diaphragm,
The rubber material is molded into a thick sheath shape that fits into the case, and the open part of the sheath wraps around the opening of the case, and the rubber material is inserted into the case filled with wax. The piston is inserted into the inner cavity of the sheath-like diaphragm, either directly or through the guide tube, and the thermal expansion of the wax squeezes the sheath-like rubber diaphragm from the outer periphery, so that the piston is inserted into the sheath. There is a means for assembling a wax thermoelement by squeezing it out from the inner cavity of a shaped diaphragm.

[Problem to be solved by the invention] In the wax thermoelement assembled in this way, in the former case shown in FIG. Because it is formed to the length that connects the cylinder 5, there is a restriction that the length cannot be shortened to less than the length of the case plus the length of the cylinder. There is a problem in that a large space must be prepared when incorporating this into the valve box of an automatic mixing faucet.

In addition, in the case of the latter method disclosed in Japanese Patent Publication No. 44-19282, the overall length of the wax thermoelement in the direction in which the piston moves in and out is shortened; The entire body of the diaphragm deforms in a compressed manner under the pressure of the waxes, thereby pushing out the piston, which reduces the volume of wax caused by the volumetric expansion of the wax due to temperature rise. The output is weakened as the pressure deforms the sheath-like diaphragm made of thick rubber material, so it is used in the thermoelement of an automatic mixing faucet to operate the mixing valve. If this is done, the spring pressure of the spring that pushes back the mixing valve must be weakened in response to the weak output, resulting in a problem that the control operation of the mixing valve becomes unstable. Moreover, when the rubber sheath-like diaphragm deforms and pushes out the piston due to the pressure of the wax that increases as the temperature rises, the outer peripheral surface of the piston is tightened in a direction perpendicular to the sliding direction of the piston. As the piston becomes more tightly bound, the movement of the piston in the extrusion direction becomes slower, and there is a problem that accurate control according to temperature changes cannot be performed. Furthermore, when the wax pressure decreases due to temperature drop and the piston is pushed in, the aforementioned pressure is applied to the outer peripheral surface of the piston from a direction perpendicular to the sliding direction, thereby eliminating the pressure that restrains the piston from moving. By pushing the piston in this state, the return operation of the piston is performed with a pressure lower than the pressure used when pushing the piston out. From this, if this method is used in the thermoelement that operates the mixing valve of an automatic mixing faucet, the mixing valve will operate at different temperatures when moving forward and backward, so the temperature range will be extremely narrow. There is a problem in that it cannot be applied to the thermoelement of an automatic mixing faucet, which requires operation that accurately follows temperature changes.

The present invention was made in order to solve these problems occurring in the conventional means, and in order to shorten the length of the piston in the direction of movement of the piston, it is possible to shorten the length of the piston in the direction of movement. The diaphragm, which is formed and fitted into the case, is designed to prevent the piston from being compressed by the pressure that is compressed by the change in the volume of the wax due to temperature rise. It is an object of the present invention to provide a new means for accurately and quickly moving the piston in and out in response to changes in the temperature of the piston.

[Means for Solving the Problems] In the present invention, as a means for achieving this object, a case is formed into a cylindrical shape and a wax is inserted into the opening of the case, on the proximal end side. A flange is provided on the outer periphery of the case, and the distal end side is formed into a bottomed sheath-like body whose outer circumferential surface fits tightly into the case inner cavity, and the outer diameter is reduced at the lower end of the body. A diaphragm with a thin nipple-shaped bag formed by a thin body circumferential wall and a thin bottom wall is connected to the outer periphery of the thick part of the body by connecting the diaphragm to the periphery of the opening of the case. The diaphragm is fitted so that its surface is in close contact with the inner surface of the case, and on the inner circumferential side of the diaphragm, there is a rigid cylinder through which a guide hole through which the piston is inserted is inserted into the shaft core, and its tip side is connected to the body of the diaphragm. The diaphragm is fitted into the thick wall part of the diaphragm, and the bulging part provided on the outer periphery of the proximal end presses the outer surface of the flange of the diaphragm, and the piston is fixedly attached to the opening of the case. An automatic mixing faucet comprising a nipple-shaped bag portion on the lower end side of the diaphragm, in which a fluid is sealed in a nipple-shaped bag portion on the lower end side of the diaphragm.
The present invention proposes a wax thermoelement for temperature control valves, etc.

[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 previous means are used for components having the same effect.

In Fig. 2, 1 is a case 1 formed into a bottomed cylindrical shape made of a metal material with good thermal conductivity and filled with wax 2. On the opening 10 side of the case 1 is a holding cylindrical part 6 with an enlarged diameter. It is formed continuously.

3 is a diaphragm made of a flexible material such as rubber or synthetic resin provided to seal the opening 10 of the case 1, and as shown in FIG. , its body 3
A radially extending flange 30 is continuous on the outer periphery of the proximal end side (upper end side) of 1, and is formed in the shape of a bottomed sheath whose distal end side is closed by a bottom wall 31a. The upper half of the body 31 is formed into a thick wall portion 31c that tightly fits into the inner circumferential surface of the case 1, but the lower half is thinned by reducing the outer diameter. By making the bottom wall 31a formed on the body peripheral wall 31b and continuing to the lower end of the bottom wall 31a thin, the body 31
Below the thick wall portion 31c, a thin nipple-shaped bag portion whose diameter is reduced in a stepwise manner is formed in the form of continuous w.

The diaphragm 3 is attached to the case 1 in such a state that the flange 30 thereof is joined to the peripheral edge of the opening 10 of the case 1, and the thick part 31c of the body 31 is closely fitted to the inner surface of the case 1. It is assembled.

5 is a cylinder connected to the end on the opening 10 side of the case 1 on the outside of the diaphragm 3;
It is the same as the cylinder 5 (or guide sleeve) in that it is formed into a rigid cylindrical shape through which the guide hole into which the piston 4 is inserted and inserted so as to be freely inserted and retracted into the shaft core part, but on the proximal end side of the cylinder 5. On the outer periphery (top end side in FIG. 2), there is a flange for fitting the cylinder 5 into the holding cylinder 6 formed at the end of the opening 10 side of the case 1 and assembling the cylinder 5 to the case 1. A bulging portion 5a that bulges out in a shape is provided. The cylinder 5 has a distal end side 5b thereof.
(lower end side in FIG. 2) is fitted into the thick part 31c of the body part 31 of the diaphragm 3 which is formed into the above-mentioned dish or sheath shape and fitted into the inner cavity of the case 1,
The lower end surface of the bulging portion 5a is fitted into the peripheral edge of the opening 10 of the case 1, which is the bottom surface of the holding cylinder 6, and the flange 30 of the diaphragm 3 is pressed down. From this state, the rim 60 of the open mouth of the holding cylinder part 6 is narrowed inward and caulked to the upper end surface of the bulging part 5a, so that it is assembled to be integrally connected to the case 1. .

Reference numeral 7 denotes a semi-solid fluid sealed in a nipple-shaped bag w formed at the lower end of the body 31 of the diaphragm 3, which is located below the lower end of the distal end 5b of the cylinder 5. be.

Further, 8 and 9 are a synthetic resin plate and a rubber piston that are slidably fitted into a guide hole in the shaft core of the cylinder 5 so as to seal the fluid 7 sealed in the nipple-shaped bag w. be. The piston 4 is slidably inserted into a guide hole in the shaft core of the cylinder 5 from the outside of the synthetic resin plate 8 and the rubber piston 9. Further, a indicates a heat-sensitive section constituted by the case 1 containing the wax 2, and b indicates an actuating section constituted by the cylinder 5 and the above-mentioned piston 4 fitted therein.

[Effect of the invention] As explained above, according to the means of the invention, the cylinder 5 that guides the movement of the piston 4 into and out
Case 1 is formed by forming the lower half of it into a bottomed sheath shape.
Since the diaphragm 3 is fitted into the body 31 of the diaphragm 3 so as to overlap with each other, the overall length of the piston 4 in the operating direction can be shortened by the length of this overlap. This cylinder 5 is connected to the thick wall portion 31 of the body portion 31 of the diaphragm 3.
Since the outer peripheral surface of the thick part 31c is in close contact with the inner peripheral surface of the case 1, the wax sealed inside the case 1 will increase in volume due to temperature rise. When it expands and increases the pressure, the pressure increases to the body 31 of the diaphragm 3.
To prevent the piston 4 from being compressed and tied up, and to smoothly move the piston 4 in and out due to the pressure change of the wax.

Also, the fluid 7 for transmitting the pressure change of the wax in the case 1 to the piston 4 is connected to the body circumferential wall 31b which is thinned by reducing the outer diameter of the lower half of the body 31 of the diaphragm 3. Since the wax inside the case 1 is enclosed in a nipple-shaped bag part w that has a reduced diameter and hangs down from the lower end of the body part 31, the waxes in the case 1 do not change in volume due to temperature changes. When the pressure is changed, the nipple-shaped bag w expands and contracts due to the pressure received from the four circumferences and the bottom side, and the internal fluid 7 is converted into a flow in the operating direction of the piston 4 and flows against the cylinder 5. As a result, pressure changes in the wax inside the case 1 can be accurately and quickly transmitted to the piston 4.

Therefore, according to the present invention, there is provided an automatic mixing faucet whose opening and closing operations are sharp and accurate in response to changes in piston temperature.
A small wax thermoelement suitable for use in temperature control valves, etc. can now be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view of a conventional wax thermoelement, FIG. 2 is a longitudinal side view of a wax thermoelement according to the present invention, and FIG. 3 is a longitudinal side view of the same diaphragm. Explanation of drawing symbols: a...Heat-sensitive part, b...Operating part, w...Bag part, 1...Case, 10...Opening part, 2...Wax, 3...Diaphragm, 30
...Brim part, 31...Body part, 31a...Bottom part, 31
b...Body circumferential wall, 31c...Thick wall portion, 4...Piston, 5...Cylinder, 5a...Bulging portion, 5b...
Proximal end side, 50... Proximal end part, 6... Holding cylinder part, 60
...rim, 7...fluid, 8...synthetic resin plate, 9...
...Rubber piston.

Claims (1)

[Scope of utility model registration request] The opening 10 of the case 1 formed into a cylindrical shape and filled with wax 2 is provided with a flange 30 on the outer periphery of the proximal end, so that the outer periphery of the distal end is tightly fitted into the inner cavity of the case 1. A body 31 is formed in a sheath-like shape with a bottom to be fitted into the body 31, and a body peripheral wall 31b having a reduced outer diameter and a thin bottom wall 3 are provided on the lower end side of the body 31.
1a, a diaphragm 3 having a thin nipple-shaped bag w formed therein, and a flange 30 of the diaphragm 3 formed in the case 1.
The thick part 3 of the body 31 is joined to the periphery of the opening 10 of the
The outer circumferential surface of the diaphragm 1c is fitted in close contact with the inner surface of the case 1, and a rigid cylinder 5 through which a guide hole through which the piston 4 is inserted into the axial core is provided on the inner circumferential side of the diaphragm 3. The distal end side 5b is fitted into the thick part 31c of the body part 31 of the diaphragm 3, and the bulging part 5a provided on the outer periphery of the proximal end is arranged so as to press the outer surface of the collar part 30 of the diaphragm 3. is fixedly attached to the opening of the case, the piston 4 is slidably fitted into the cylinder 5, and the fluid 7 is sealed in the nipple-shaped bag w on the lower end side of the diaphragm 3. Wax thermoelement for automatic mixing faucets, temperature control valves, etc.