JPH01320722A - Temperature switch assembling method - Google Patents

Abstract

PURPOSE:To make it possible to assemble a temperature switch capable of operation at a specific temperature in high accuracy and in high efficiency by warming a heat reacting body up to the temperature detectable by a temperature switch, and fixing the heat reacting body or the contact part to a casing at that thermally expanded stage. CONSTITUTION:A contact part 6 which contains insulating material 8 at the inner face is inserted into a casing 1 and fixed there. Next, a heat reacting body 3 with one end of which a stator 2 is engaged and with the other end of which a conductor 4 and an insulator are engaged is inserted deep with the conductor 4 ahead from the opening side of the casing 1, and the end face of the conductor 4 is contacted with the contact part 6. Next, thermosetting adhesive F is applied by proper amounts to the inner face of the casing 1 on the stator 2 side, and the heat reacting body 3 is warmed up to the temperature detectable by a temperature switch. By this heating, the heat reacting body 3 expands, with the contact end part between the conductor 4 and the contact part 6 as a datum plane, in the axial direction of the casing 1, and the stator 2 shifts and is adhered and fixed. Thereafter, at the stage when the heat reacting body 3 begins to shrink, a contact part 7 is engaged with the contact part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of assembling a temperature switch that opens and closes contacts at a predetermined temperature.

(Prior art) The applicant had previously proposed a temperature switch that opens and closes contacts at a predetermined temperature.
No. 519).

This temperature switch includes a heat sensitive part that has thermal expansion and contraction properties,
It consists of a switching element that is disposed within the range of expansion and contraction of the heat-sensitive part and is activated by the thermal expansion of the heat-sensitive part. temperature can be detected.

In this temperature switch, the heat-sensitive part expands or contracts in response to changes in the surrounding temperature, so it can be used repeatedly regardless of the number of times it is activated, and accurate temperature detection can be performed based on the thermal expansion and contraction properties of the heat-sensitive part. It has the advantage of being possible.

(Problem to be Solved by the Invention) By the way, the detected temperature in the above-mentioned temperature switch is approximately determined by the distance between the movable end of the heat sensitive part and the switching element when the material of the heat sensitive part is the same. ,
If the distance between the two is wide, a large thermal expansion is required in the heat-sensitive portion, and the detected temperature becomes high; if the distance between the two is narrow, the heat-sensitive portion does not require such a large thermal expansion, and the detected temperature is low. In other words, if you want the aforementioned temperature switch to detect a certain temperature, for example about 60 degrees Celsius, it is necessary to set the interval to a size commensurate with the temperature and to precisely fix both at this set position. be.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for assembling a temperature switch that can be assembled with high precision and efficiency, and which can operate at a predetermined temperature.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an assembly method according to claim (1), which includes a cylindrical casing having thermal conductivity, and one end portion on one side inside the casing. a fixed thermally responsive body having thermal expansion and contraction properties; and a contact portion that faces the other end of the thermally responsive body at a predetermined distance, is fixed to the other side of the casing, and is openable by thermal expansion of the thermally responsive body. In the method of assembling a temperature switch, a contact part is fixed to one side inside a casing, a thermally responsive body is inserted into the casing, and one end thereof is brought into contact with the contact part, and then the thermally responsive body is heated to a predetermined temperature to cause thermal expansion while maintaining the contact state, and the other end of the thermally responsive body during this thermal expansion is fixed to the other side inside the casing.

Further, in the assembly method according to claim (2), there is provided a cylindrical casing having thermal conductivity, a thermally responsive body having thermal expansion/contraction properties and having one end fixed to an inner side of the casing, and the thermally responsive body. In a method for assembling a temperature switch, the temperature switch has a contact portion facing the other end at a predetermined distance, fixed to the other side inside the casing, and capable of being closed by thermal expansion of a thermally responsive body. After fixing one end of the thermally responsive body and inserting a contact portion into the casing to contact the other end of the thermally responsive body, the thermally responsive body is heated to a predetermined temperature while maintaining the contact state. It is characterized in that the contact portion is moved by thermal expansion, and the contact portion is fixed to the other side inside the casing at this moved position.

(Function) According to the assembly method described in claim (1), one end portion of the thermally responsive body is brought into contact with a contact portion fixed to one side inside the casing, and the thermally responsive body is moved to a predetermined position in the contact state. When heated to a certain temperature, the thermally responsive body expands in the axial direction of the casing with respect to the contact portion according to its own coefficient of thermal expansion. Therefore, if the other end of this expanded thermally responsive body is fixed to the other side inside the casing, the thermally responsive body will contract with respect to the fixed end as the temperature drops after assembly is completed.
A gap suitable for the temperature (sensed temperature) is created between one end of the thermally responsive body and the contact portion.

Further, according to the assembly method described in claim (2), the contact portion is brought into contact with the other end portion of the thermally responsive body whose one end portion is fixed to one side inside the casing, and the thermally responsive body is held in a predetermined position in the contact state. When heated to a certain temperature, the thermally responsive body expands in the axial direction of the casing according to its own thermal expansion coefficient with the fixed end as a reference, and moves the contact portion in the axial direction of the casing. Therefore, if this contact part is fixed to the other side inside the casing at the moving position, the thermally responsive body will contract with respect to the fixed end as the temperature drops after assembly, so that one end of the thermally responsive body and A gap suitable for the temperature (sensed temperature) is created between the contact portion and the contact portion.

(Example) Hereinafter, the present invention will be explained in detail with reference to the drawings.

First, a configuration example of a temperature switch to which the present invention is applicable will be described with reference to FIG. 1(a).

In the figure, 1 is a cylindrical casing made of a metal material with excellent thermal conductivity, and 2 is a cylindrical stator fixed to the inner surface of the casing 1.
A protrusion 2a is provided on one side of the holder.

Reference numeral 3 denotes a cylindrical thermally responsive body made of silicone rubber, fluorine rubber, etc., which exhibits thermal expansion and contraction linearly in response to temperature changes.The thermally responsive body 3 has one end attached to the projection 2a of the stator 2. They are fitted and disposed within the casing 1.

Reference numeral 4 denotes a cylindrical conductor made of a conductive material such as metal, and the conductor 4 is fitted into the other end of the thermally responsive body 3 .

Reference numeral 5 denotes a cylindrical insulator made of an insulating material such as plastic, and the insulator 5 is fitted around the conductor 4 protruding from the thermally responsive body 3 .

Reference numeral 6 denotes a cylindrical first contact portion made of a conductive material such as metal, and the first contact portion 6 is disposed facing the conductor 4 at a predetermined distance S. It is fixed on the other side of the inside.

7 is a second contact portion fixed to the center hole of the first contact portion 6 via an insulating material 8 such as plastic;
The contact portion 7 includes a bottomed cylindrical body 7a made of a conductive material such as metal, a pressing rod 7b slidably disposed within the cylindrical body 7a, and a pressure rod 7b that contacts the inner bottom surface of the cylindrical body 7a. A spring 7C of low elastic force is interposed between the pressing rod 7b and the pressing rod 7b, and the tip of the pressing rod 7b slightly protrudes from the first contact portion 6 in the direction of the conductor 4.

The operation of the temperature switch will be explained with reference to FIG.
The inside of the conductor 4 is expanded in the direction of the arrow in the figure with its fixed end as a reference, and as a result, the conductor 4 moves toward the first and second contact portions 6 and 7. When the ambient temperature reaches the specified temperature,
Thermal expansion of the thermally responsive body 3 brings the conductor 4 into contact with the first and second contact portions 6 and 7, and both contact portions 6 and 7 are electrically connected to close the contact.

Furthermore, when the ambient temperature drops, heat radiation through the casing 1 causes the heat-responsive body 3 to contract inside the casing 1 in the opposite direction with respect to its fixed end, which causes the first and second The conduction between the contact portions 6 and 7 is broken and the contact is opened.

In the illustrated temperature switch, the conductor 4 is first brought into contact with the pressing rod 7b of the second contact portion 7, and the pressing rod 7b is moved while being pressed against the biasing force of the spring. Therefore, even if vibration or impact is applied just before the contact closes, it is possible to prevent the contact from opening erroneously, and the biasing force provided by the pressure rod 7b allows the contact to quickly open as the temperature drops. The advantage is that it can be done.

Next, a method for assembling the temperature switch shown in FIG. 1(a) will be explained with reference to FIGS. 2(a) to 2(c).

First, as shown in FIG. 2(a), the first contact portion 6 containing the insulating material 8 is inserted into the inner surface of the casing 1 and fixed. As this fixing method, in addition to bonding with an adhesive, various types of welding such as laser one-spot welding, caulking, etc. can be employed.

Next, as shown in FIG. 2(b), a stator 2 is attached to one end.
The heat-responsive body 3 with the conductor 4 and the insulator 5 fitted on the other end is deeply inserted from the opening side of the casing 1 with the conductor 4 first, and the end surface of the conductor 4 is First contact part 6
bring it into contact with.

Next, epoxy is applied to the inner surface of the casing 1 on the stator 2 side.
An appropriate amount of a thermosetting adhesive F such as a phenolic adhesive is applied, and the thermally responsive body 3 is heated to a temperature corresponding to the temperature detected by the temperature switch. A specific method for warming the thermally responsive body 3 to this predetermined temperature is to place the casing 1 into which the thermally responsive body 3 has been inserted into an atmosphere at a prescribed temperature until the temperature of the thermally responsive body 3 stabilizes. Alternatively, a method may be adopted in which a thermometer is installed inside the casing 1 and hot air is blown onto the casing 1 until it reaches a predetermined temperature.

Due to this heating, the thermally responsive body 3 maintains the electrical conductor 4 in contact with the first contact portion 6 as shown in FIG. The stator 2 expands in the axial direction, thereby moving the stator 2 in the direction of the arrow in the figure, and the stator 2 is adhesively fixed at the moved position. Thereafter, when the thermally responsive body 3 begins to contract, the second contact portion 7 is fitted into the first contact portion 6.

This completes the series of assembly steps for the temperature switch shown in FIG. 4 and the first contact portion 6, an interval is created that matches the heating temperature, that is, the temperature detected by the temperature switch.

If the above assembly method causes uneven radiation of the adhesive F for fixing the stator, grooves 2a are formed on the outer surface of the stator 2 through which the adhesive F can flow, as shown in FIG. Further, it is also possible to form irregularities (not shown) on the outer surface of the stator 2, and furthermore, grooves, irregularities, slits, etc. similar to those described above may be formed at the position where the stator 2 is fixed in the casing 1.

Furthermore, in the above embodiment, a thermosetting adhesive was used to fix the stator 2, but the casing 1 on the stator 2 side
An ultraviolet curing adhesive may be applied to the inner surface and ultraviolet rays may be irradiated during fixing, or a laser may be irradiated to the boundary between the casing 1 and the stator 2 to weld them together.

Furthermore, in the above-mentioned assembly method, the first contact portion 6 is first fixed on the inner surface side of the casing 1, but it is also possible to fix the thermally responsive body 3 first. This assembly method will now be explained with reference to FIG.

The temperature switch illustrated in FIG. 4 differs from the above-mentioned temperature switch in that both the first contact portion 6 and the second contact portion 7 are made of a conductive material in a bar shape, and both contact portions 6.7 are spaced apart from each other. The difference is that a cylindrical insulating material 8, which is inserted and arranged substantially parallel to each other and has a weldable portion at least on the outer circumference, is fixed to the inner surface of the casing 1, but the other configurations are the same.

First, from one side of the casing 1, the stator 2. The thermally responsive body 3 in which the conductor 4 and the insulator 5 are respectively fitted is inserted with the conductor 4 first, and the stator 2 is fixed to the inner surface side of the casing 1. As this fixing method, in addition to bonding with adhesive, various welding by laser or the like, caulking, etc. can be adopted.

Next, the insulating material 8 into which both the contact portions 6 and 7 are inserted is deeply inserted from the opening side of the casing 1, and the protruding ends 6a and 7a of both the contact portions 6 and 7 are brought into contact with the end surface of the conductor 4.

Next, the thermally responsive body 3 is heated to a temperature corresponding to the temperature detected by the temperature switch. A specific method for warming the thermally responsive body 3 to this predetermined temperature is to place the casing 1 into which the thermally responsive body 3 has been inserted into an atmosphere at a prescribed temperature until the temperature of the thermally responsive body 3 stabilizes. Alternatively, a method may be adopted in which a thermometer is installed inside the casing 1 and hot air is blown onto the casing 1 until it reaches a predetermined temperature. Due to this heating, the thermally responsive body 3
expands in the axial direction of the casing 1 according to its own coefficient of thermal expansion with the fixed end as a reference, and as a result, the insulating material 8
is pushed outward and moves.

Next, a laser beam is irradiated to the boundary between the casing 1 and the insulating material 8 (section A in the figure) to weld them together, and the insulating material 8 is fixed at the moved position.

This completes the series of assembly steps for the temperature switch shown in FIG. 1.Protruding end 6a of second contact portion 6.7
, 7a, an interval is created that matches the heating temperature, that is, the temperature detected by the temperature switch.

In the above embodiment, laser welding was used to fix the insulating material 8, but it is also possible to apply a thermosetting adhesive to the inner surface of the casing 1 on the insulating material 8 side before heating. , Also, apply UV-curable adhesive to the same area,
Ultraviolet rays may be irradiated during fixation.

(Effects of the Invention) As explained above, according to the present invention, during assembly, the thermally responsive body is warmed to the temperature detected by the temperature switch -14 = The thermally responsive body or the contact portion is fixed to the casing during the thermal expansion stage of the eye. Accordingly, after the assembly is completed, by contraction of the thermally responsive body, it is possible to accurately create a gap between one end of the thermally responsive body and the contact portion that matches the detected temperature. Therefore, it is possible to assemble a temperature switch that can reliably operate at a desired temperature with high precision and efficiency, and it is possible to provide an assembly method that is extremely beneficial in terms of quality and production.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention.
Figure (a) is a longitudinal cross-sectional view of the temperature switch, Figure 1 (b) is an explanatory diagram of the operation of the temperature switch shown in Figure 1 (a), and Figures 2 (a) to 2 (e) are assembled. FIG. 3 is a perspective view of a stator, and FIG. 4 is a longitudinal sectional view of a temperature switch showing another embodiment. 1... Casing, 3... Thermal response body, 6... First
a contact portion, 7... a second contact portion;

Claims (2)

[Claims] (1) A cylindrical casing having thermal conductivity, a thermally responsive body having thermal expansion and contraction properties fixed at one end to one side inside the casing, and a thermally responsive body having a predetermined distance from the other end of the thermally responsive body. A method for assembling a temperature switch comprising contact portions facing each other and fixed to the other side inside the casing and capable of being closed by thermal expansion of a thermally responsive body, the contact portion being fixed to one side inside the casing; After inserting the thermally responsive body and bringing its one end into contact with the contact portion, the thermally responsive body is heated to a predetermined temperature to thermally expand while maintaining the contact state, and the other end of the thermally responsive body is heated during this thermal expansion. 1. A method for assembling a temperature switch, characterized in that one part is fixed to the other side inside a casing. (2) A cylindrical casing having thermal conductivity, a thermally responsive body having thermal expansion/contraction properties fixed at one end to the inside of the casing, and spaced apart from the other end of the thermally responsive body by a predetermined distance. A method for assembling a temperature switch comprising contact portions facing each other and fixed to the other side inside the casing and capable of being closed by thermal expansion of the thermally responsive body, comprising: fixing one end of the thermally responsive body to one side inside the casing; After inserting a contact portion into the casing and bringing it into contact with the other end of the thermally responsive body, the thermally responsive body is heated to a predetermined temperature and thermally expanded while maintaining the contact state, and the contact portion is moved; A method for assembling a temperature switch, characterized in that the contact portion is fixed to the other side inside the casing at this moved position.