JPS6143032Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention combines a positive temperature coefficient thermistor in a thermally conductive state with a wax thermostat connected to a valve that opens and closes, and controls the valve by controlling the energization to the positive temperature coefficient thermistor. This invention relates to improvements to thermal valves that open and close the valves.

In the conventional thermal valve using the PTC thermistor described above, as shown in FIG. 1, the ceramic plate 4 constituting the PTC thermistor is
When assembling the wax thermostat 3 as a heater to start the wax thermostat 3 in a thermally conductive state, the electrode plate 6 which serves as a heat dissipation plate of the ceramic plate 4 is brought into contact with the bottom surface of the temperature-sensitive temperature 31 of the wax thermostat 3. I try to keep in touch with them. Therefore, when the ceramic plate 4 generates heat due to electricity, and the heat is conducted to the temperature sensing temperature 31 of the wax thermostat 3, it is once transmitted to the electrode plate 6, which serves as a heat dissipation plate, and from the electrode plate 6, the Since the temperature is transmitted to the temperature sensing part 31 of the wax thermostat 3, there is a problem in that the startup of the wax thermostat 3 is delayed and the thermal valve, which is slow to open and close, becomes even slower.

Therefore, in order to solve this problem, the present examiner installed a ceramic plate 4 with positive characteristics on the bottom surface of the temperature sensitive temperature 31 made of a metal material with good conductivity of the wax thermostat 3, as shown in FIG. One side of the electrode plate 6 is attached so as to fit into the temperature sensing part 31, and the other electrode plate 5 is placed between the other side of the ceramic plate 4 and the cover plate 71 of the guide holder 7. We have developed a device that can be inserted in a pressure-welded state. However, the electrode plate 6 on the side that fits into the temperature sensing part 31 is
Due to the heat, the contact with the temperature sensing part 31 becomes poor,
An instability problem arose.

The present invention was devised in order to solve these problems in the prior art, and uses simple means to maintain good contact between the electrode plate and the temperature-sensing part from beginning to end. The purpose is to provide a new means to stably maintain the

In the present invention, as a means to achieve this objective, a wax thermostat that is activated by temperature changes is provided in the valve box to open and close a valve port or a valve seat formed in the valve box. The wax thermostat is a thermoelectric valve that is assembled in conjunction with the wax thermostat, and the temperature sensing part of the wax thermostat is combined with a ceramic plate with positive characteristics that heats up to a set temperature when energized. The outer casing including the temperature-sensing part is made of a metal material with good conductivity, and the outer casing is made of a transparent body formed on the fitting body and the upper part of the guide holder made of an insulating material that supports the outer casing. The inner end of one of the electrode plates is inserted in a press-contact state at the fitting part with the hole part, and assembled into the through-hole part of the guide holder. one side of the ceramic plate is brought into contact with the other side of the ceramic plate, and the other electrode plate is interposed in pressure contact between the other side of the ceramic plate and the cover plate of the guide holder, and the electrode plate is placed on the other side of the ceramic plate. The present invention provides a thermal valve characterized in that the valve is configured to be in contact with the valve.

Next, embodiments 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.

In Fig. 3, A is a thermal valve, which is composed of a valve box 2 containing a valve 1, a guide holder 7 containing a wax thermostat 3, a ceramic plate 4 with positive characteristics, electrode plates 5, 6, etc. It is configured.
As shown in FIG. 3, the valve box 2 is integrally formed with a connecting tube 22 communicating with an inlet 21 on one side of the left and right, and a connecting tube 2 communicating with an outlet 23 on the other side.
4 are integrally formed, and a valve chamber 25 communicating with the inlet port 21 and the discharge port 23 is formed inside. A partition wall 2 is provided in the valve chamber 25 of the valve chamber 25 to partition the inflow port 21 and the discharge port 23.
6, a valve port 27 is opened in the vertical direction in the partition wall 26, and a valve seat 28 is formed on the periphery of the upper surface side of the valve port 27.

The valve 1 has a valve seat 2 as shown in FIG.
a valve main body 11 that is assembled to the valve box 2 so as to move forward and backward relative to the valve seat 28 to open and close communication between the inlet 21 and the outlet 23 of the valve chamber 25, and move forward and backward relative to the valve seat 28; Valve stem 1 connected to the valve body 11
2, the lower edge of the valve main body 11 faces the valve seat 28, and is biased by the spring 13 so that the lower edge comes into pressure contact with the valve seat 28, and the valve stem 12 is the bottom wall 2a of the valve box 2
It penetrates the fitting hole 29 provided in the hole 29 so as to be slidable up and down,
The lower end portion protrudes from the fitting hole 29 into the cylindrical portion 2b provided on the bottom surface of the valve box 2.

As shown in FIG. 3, the wax thermostat 3 is assembled in a guide holder 7 that is fixed within and below the valve box 2 so as to operate the valve 1. The wax thermostat 3 is similar to conventional wax thermostats in that the wax sealed in the temperature sensing part 31 of the wax thermostat 3 expands as the temperature rises and is pushed out to the operating part 32. The outer casing of the temperature sensing section 31 is made of a metal with good electrical conductivity, such as aluminum, gunmetal, or iron.

8 indicates the protruding end of the actuating portion 32 and the valve stem 12;
This is an insulating material interposed between the lower end of the

The guide holder 7 is a molded product made of a synthetic resin material which is an insulating material, and serves as a cover for covering the outer periphery of the wax thermostat 3 with insulation, and also as a guide for the vertical movement of the operating portion 32 thereof. The bottom surface of the guide holder 7 is formed into an open portion that opens when the cover plate 71 is removed.
72 is a screw for attaching the cover plate 71.

As shown in FIG. 3, the positive temperature ceramic plate 4 has a shape, for example, a disk shape (FIG. 4), which fits in the inner cavity of the guide holder 7, and its upper surface side is covered with the wax. One electrode plate 5 is brought into contact with the bottom surface of the temperature sensing part 31 of the thermostat 3 (FIG. 5), and the lower surface thereof is interposed in pressure contact with the cover plate 71 of the guide holder 7. There is.
This electrode plate 5 has, for example, a hawk shape (fourth
(Fig.) and may be formed of an elastic metal plate so as to have a curvature.

As shown in FIG. 3, the other electrode plate 6 has an outer casing 30 containing the temperature sensing part 31 of the wax thermostat 3, and a transparent body 34 of which is formed on the upper part of the guide holder 7. By fitting and assembling into the hole portion 73, when assembling and supporting the guide holder 7, the fitting body portion 34 of the outer casing 30 and the through-hole portion 73 of the guide holder 7 fit into the fitting portion. By interposing the inner end of the electrode plate 6 and fitting the fitting body 34 of the outer casing 30 into the through-hole portion 73 in this state, the electrode plate 6 is assembled. is the outer casing 30
It is assembled into the outer casing 30 by being in pressure contact with the outer surface of the fitting body 34 of the ceramic plate 4 through the outer casing 30 made of metal with good conductivity. It is set to be energized.

The electrode plate 6 is inserted into the fitting portion of the fitting body 34 of the outer casing 30 and the transparent portion 73 of the guide holder 7 in order to facilitate the assembly operation.
For example, as shown in FIG.
2 is formed, and the outer casing 3
It is effective to provide the fitting body 34 of the 0 with a step 33 against which the flange 61 into which the hole 62 is fitted abuts. Moreover, this electrode plate 6 is
In order that the terminal piece 63 provided on the outer end side of the electrode plate 5 is located near the terminal piece provided on the outer end side of the electrode plate 5, the middle part thereof is bent vertically and horizontally along the inner wall of the guide holder 7. It is also effective.

Further, as shown in FIG. 4, a female thread 62a may be formed on the inner wall of the hole 62, and a male thread 34a may be formed on the outer periphery of the fitting body 34, and these may be screwed together. be. Further, as shown in FIG. 5, the wax thermostat 3 is screwed by screwing the nut 9 using the external thread 34a of the protruding end that protrudes upward from the transparent portion 73 of the body 34. It may be assembled by

The embodiment device configured as described above operates as follows.

In the assembled state as shown in FIG.
When each outer end of the electrode plate 6 is connected to an electric circuit leading to a power source and a switch provided in the electric circuit is turned on, the flow flows from the electrode plate 6 to the ceramic plate 4 via the outer casing 30 and then to the electrode plate 5. Then, the current flowing to the power supply side energizes the ceramic plate 4 and raises the temperature of the ceramic plate 4 to a predetermined temperature, thereby heating the wax thermostat 3 and opening the valve 1. When the electric circuit is turned off by activation, the power to the ceramic plate 4 is cut off,
As the temperature of the wax thermostat 3 decreases, the valve 1 begins to open.

At this time, wax thermostat 3
The electrode plate 6 on the side connected to the outer casing 30 is interposed so that its connection part is inserted into the fitting part between the outer casing 30 and the transparent part 73 of the guide holder 7 that holds it. This ensures that a reliable connection is maintained throughout.

As explained above, the thermal valve A according to the present invention is
A valve port 2 in which a wax thermostat 3 that is activated by temperature changes is formed in the valve box 2.
7 or a valve 1 provided to open and close the valve seat 28
In a thermal valve, a ceramic plate 4 with positive characteristics, which heats up to a set temperature when energized, is combined with the temperature-sensing part 31 of the wax thermostat 3 in a heat-transfer manner. The outer casing 30 containing the temperature sensing part 31 of the Tux thermostat 3 is made of a metal material with good conductivity, and the outer casing 30 is made of an insulating material that supports the fitting body 34 and the outer casing 30. The inner end side of one electrode plate 6 is inserted in a press-contact state to the fitting part with the through-hole portion 73 formed in the upper part of the guide holder 7, and the guide holder 7
One side of the ceramic plate 4 with positive characteristics is brought into contact with the bottom surface of the temperature sensing part 31 of the wax thermostat 3, and the other side of the ceramic plate 4 and the lid of the guide holder 7 are assembled. Since the other electrode plate 5 is interposed between the ceramic plate 71 and the ceramic plate 71 in a press-contact state, and the electrode plate 5 is brought into contact with the other surface of the ceramic plate 4, the wax thermostat 3 can be operated. A positive temperature coefficient thermistor for the purpose is made of a bare positive coefficient ceramic plate 4 and two separate electrode plates 5,
6, and the bare ceramic plate 4 with positive characteristics comes into direct contact with the bottom surface of the temperature sensing part 31 of the wax thermostat 3 without intervening the electrode plate 6, so that the temperature sensing The efficiency of heat conduction to the portion 31 is improved. In order to do this, the electrode plate 6 is separated from the ceramic plate 4.
is firmly assembled so that its inner end side is fitted into the fitting portion between the fitting body 34 of the outer casing 30 of the wax thermostat 3 and the through-hole portion 73 of the guide holder 7, and is electrically conductive. It is in pressure contact with the outer casing 30 made of a metal with good properties, and is electrically connected to the upper surface side of the ceramic plate 4 through the outer casing 30.
Since the contact area with the outer casing 30 is in a hard pressure contact state and is located away from the ceramic plate 4,
The heat of the ceramic plate 4 maintains a good contact state without causing contact failure.

[Brief explanation of the drawing]

1 and 2 are vertical cross-sectional views of a conventional thermal valve, FIG. 3 is a vertical cross-sectional view of the thermal valve of the present invention, and FIG. 4 is an exploded perspective view of the main parts of the same thermal valve. FIG. 5 is a perspective view of the above main parts in a combined state. Explanation of drawing symbols, A...thermal valve, 1...valve, 1
1... Valve main body, 12... Valve stem, 13... Spring, 2
... Valve box, 2a ... Bottom wall, 2b ... Cylindrical part, 21
...Inflow port, 22...Connection pipe, 23...Discharge port,
24... Connection cylinder, 25... Valve chamber, 26... Partition wall,
27... Valve port, 28... Valve seat, 29... Fitting hole,
3...Wax thermostat, 30...Outer casing,
31... Temperature sensing part, 32... Operating part, 33... Step part, 34... Fitting body part, 34a... Male thread, 4...
... Ceramic plate, 5, 6 ... Electrode plate, 61 ... Flange, 62 ... Hole, 62a ... Female thread, 63 ...
Terminal piece, 7... Guide holder, 71... Lid plate,
72...Screw, 73...Through hole part, 8...Insulating material, 9...Nut.

Claims (1)

[Scope of utility model registration request] A valve port 2 in which a wax thermostat 3 that is activated by temperature changes is formed in the valve box 2.
7 or the valve seat 28 is connected and assembled to the valve 1 provided to open and close it, and the temperature sensing part 31 of the wax thermostat 3 is made of a ceramic plate with positive characteristics that raises the temperature to a set temperature when energized. 4, the outer casing 30 including the temperature sensing part 31 of the wax thermostat 3 is formed of a metal material with good conductivity, and the outer casing 30 is made of a metal material with good conductivity. The inner end side of one electrode plate 6 is interposed in a press-contact state at the fitting part between the joint body part 34 and the transparent part 73 formed on the upper part of the guide holder 7 made of an insulating material that supports the outer casing 30. At least, it is assembled into the through hole part 73 of the guide holder 7, one side of the ceramic plate 4 with positive characteristics is brought into contact with the bottom surface of the temperature sensing part 31 of the wax thermostat 3, and the other side of the ceramic plate 4 is brought into contact with the bottom surface of the temperature sensing part 31 of the wax thermostat 3. The other electrode plate 5 is interposed between the cover plate 71 of the guide holder 7 and the cover plate 71 of the guide holder 7 in a press-contact state.
A thermal valve characterized in that it is constructed by making contact with the other side of a ceramic plate 4.