JPH0785757A - Temperature detector for heat exchanger - Google Patents

Abstract

PURPOSE:To protect a lead wire by the end part of a resin tube and avoid the breakage of the lead wire by the contact with the end part of a support pipe. CONSTITUTION:One end part side of a tube 20 is sealed to interpolate an internal element consisting of a temperature fuse element therein, and the side for taking lead wires 18a, 18b to the outside is sealed. An aluminum tube 22 consists of a member having good heat conductivity to be mounted on the body side of a heat exchanger, and has the tube 20 interpolated therein. The end part on the side for taking the lead wire to the outside of a resin tube is slightly protruded from the corresponding end part of the aluminum tube 22, and the aluminum tube 22 is caulked to fix the aluminum tube 22 to the tube 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature detector used in a heat exchanger such as a refrigerator.

[0002]

2. Description of the Related Art Various temperature detectors such as temperature fuses and thermostats are attached to heat exchangers used in refrigerators and air conditioners.

For example, in an evaporator installed in a refrigerator or the like, a defrosting tubular heater is provided together with an evaporator pipe because frost is formed during operation, and a temperature fuse as a temperature detector is connected in series with the defrosting tubular heater. When the temperature rises due to connection, the defrosting tubular heater is cut off from electricity to maintain safety.

FIG. 5 shows a schematic vertical cross section of a refrigerator using this type of thermal fuse, and FIG. 6 is an internal structural view as seen from the direction of the arrow in FIG. 5, where 1 is a freezer compartment 2 and a refrigerator compartment 3. Refrigerator 5 having a vegetable compartment 4 is provided on the back side of the freezer compartment 2, an evaporator pipe 6 meanders, and an evaporator having an evaporator fin 7, 8 is a defroster disposed below the evaporator 5 to prevent frost formation. The tubular heater 9 is a temperature fuse arranged in parallel with the evaporator 5.

FIG. 7 shows the details of the mounting of the thermal fuse 9 described above.
Is fixed to an evaporating side plate 10 which is provided in the up-down direction and which is fixed by a Ω-shaped binder 11. A lead wire 12 is taken out from one end of the thermal fuse 9 and connected to a corresponding power source through a connector (not shown).

Reference numeral 14 designates a frost receiving tray.

Next, the internal structure of the thermal fuse 9 will be described with reference to FIG. 8. Reference numeral 15 is a thermal fuse element which is cut by heat generated by overcurrent, and 16 and 17 are thermal fuse elements 1.
The internal terminals 19 are formed by connecting lead terminals 5a, 18a and 18b which are connected to the lead wire 5 by the coated lead wires.

Next, as shown in FIG. 9, the internal element 19 is inserted into a transparent tube 20 having a predetermined length and open at both ends, and both ends of the tube 20 are heat-welded by a high-frequency welder.

As a result, the left end of the tube 20 is hermetically sealed to form the welder portion 20a, while the tube 20 is hermetically sealed slightly inward from the right end thereof.
Of the lead wires 18a, 1
8b is taken out and the inside of the tube 20 is sealed.

Subsequently, the lead wires 18a and 18b protruding from the tube 20 are aligned with the insertion holes of the protective rubber push 21 having a brim, and the protective rubber push 21 is attached to the lead wires 18a and 18b. insert.

Further, the structure shown in FIG. 9 is shown in FIG.
0 is inserted into an aluminum pipe 22 having both ends opened, and the right end of the aluminum pipe 22 is crimped and fixed by a crimping portion 22a.
For the convenience of attaching the temperature fuse 9 to the side plate 10 by means such as the above, the caulking portion 22b is formed by caulking.

[0012]

The above-mentioned thermal fuse 9 protects the edge portions of the lead wires 18a and 18b protruding from the tube 20 and attaches the thermal fuse 9 to the main body as shown in FIG. Although the protective rubber push 21 is used for convenience of positioning, the lead wires 18a and 18b are connected to the protective rubber push 21.
There is a problem that the workability at the time of assembling is very bad because it takes time and effort to insert into.

Therefore, an object of the present invention is to provide a temperature detector for a heat exchanger, which improves the work of assembling the temperature detector.

[0014]

SUMMARY OF THE INVENTION The present invention comprises a temperature sensitive element,
A lead wire connected to both ends of the temperature sensing element, a resin tube in which one end side is sealed to house the temperature sensing element, and a side from which the lead wire is taken out is sealed, and this resin tube is housed. And a support tube made of a member having a high thermal conductivity attached to the main body side of the heat exchanger, and an end portion of the resin tube on the side where the lead wire is taken out to the outside slightly from a corresponding end portion of the support tube. The support tube and the resin tube are fixed by protruding and caulking the support tube.

[0015]

With the above structure, the lead wire inside the resin tube is fixed at a position where the end portion on the side where the lead wire is taken out to the outside is projected slightly outward from the corresponding end portion of the support tube, so that the lead wire is fixed at the end Protected against damage from the lead wires coming into contact with the ends of the support tube and breaking. Therefore, the protection rubber push is no longer required to protect the lead wire protruding from the resin tube as in the past, and the conventional work of inserting the lead wire into the insertion hole of the protection rubber push is eliminated, improving workability. The number of parts can also be reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an internal block diagram of a thermal fuse showing a first embodiment of the present invention, and FIG. 2 is an overall external view of the thermal fuse shown in FIG. In the figure, reference numeral 15 is a temperature fuse element that is cut by heat generation due to overcurrent, 16 and 17 are connection terminal terminals that are connected to the temperature fuse element 15 by lead wires, and 18
Reference numerals a and 18b are coated lead wires to form the internal element 19. First, the internal element 19 having this structure is prepared.

Next, the internal element 19 is inserted into a transparent tube 20 having a predetermined length and open at both ends, and heat is welded to both ends of the tube 20 by a high frequency welder. In this case, the transparent tube 20 having the predetermined length is made longer than the conventional tube 20 shown in FIG. 9 by a length of about L as shown in FIG. 1 corresponding to the aluminum tube 22 shown in FIG. deep. This is to ensure the substantially same length as the protective rubber push 21 shown in FIG.

As a result, in the tube 20, the left end of the tube 20 is sealed by the high-frequency welder to form the welder portion 20a, while the opening space 20c is left slightly inside the right end of the tube 20.
The lead wires 18a and 18b are taken out from 0c, the welder portion 20b to be sealed is formed, and the inside of the tube 20 is sealed.

Then, the portion having the structure shown in FIG. 1 is inserted into the aluminum tube 22 shown in FIG. In this case, the tube 20 and the aluminum tube 22 are aligned so that the welder portion 20b of the tube 20 projects slightly outward from the end of the aluminum tube 22.

Then, the right end of the aluminum tube 22 is crimped to provide a caulking portion 22a to be fixed to the tube 20, and a caulking portion 22b is caulked on the left side of the aluminum tube 22 for attaching to the main body.

In this way, the lead wires 18a and 18b of the portion protruding from the tube 20 are first fixed by the welder portion 20b of the tube 20, and further, the tube 20.
It is protected by the opening space 20c formed in.

In addition, the tube 20 of this embodiment has a length of L compared to the conventional tube 20 shown in FIG.
Since 0 is lengthened, it can be directly inserted into the aluminum pipe 22 shown in FIG. 2 having the same length as the conventional aluminum pipe 22. Also, FIG.
Since the caulking portion 22a at the right end portion is provided so that the welder portion 20b of the tube 20 projects slightly outward as shown in FIG. Without lead wires 18a, 1
8b is protected.

Therefore, the protection rubber push 21 is no longer required to protect the lead wires 18a and 18b protruding from the tube 20 as in the conventional case, and the protection rubber push 21 is eliminated.
The conventional labor for inserting the lead wires 18a and 18b into the insertion hole of is eliminated, the workability is improved, and the number of parts can be reduced.

FIG. 3 is an internal block diagram of a thermal fuse showing a second embodiment of the present invention, and FIG. 4 is an external view of the thermal fuse of FIG.

In the figure, the internal element 19 is made in the same structure as in the first embodiment of FIG. 1, and the tube 20 is longer than the tube 20 shown in FIG. 9 by about M, as shown in FIG.
That is, the length is increased by almost the length of the protective rubber push 21.

Next, the internal element 19 is inserted into the tube 20, a welder portion 20a is formed at the left end of the tube 20 by a high frequency welder, and a welder portion is formed at the inside of the length M from the right end portion of the tube 20 by a high frequency welder. 2b is formed, the internal element 19 is sealed, and the opening space 20c is formed.

The tube 20 is inserted into the aluminum tube 22 shown in FIG. 4, and the tube 20 at the right end is positioned so as to protrude from the aluminum tube 22 by the length N.
The tube 20 is fixed to the tube 20 by caulking, and the caulking portion 22a is provided, and the caulking portion 22b is provided for attachment to the main body.

In this way, the lead wires 18a and 18b of the portion protruding from the tube 20 are protected by the inner wall of the tube in the opening space 20c, so that the lead wires 18a and 18b come into contact with the ends of the aluminum tube 22 and lead. Lines 18a, 18
This is avoided because b is damaged.

Accordingly, the lead wire 18 is the same as in the first embodiment.
The protection rubber push 21 is not required for protection of a and 18b, and the workability can be improved without the need for inserting into the conventional protection rubber push 21.

In the present embodiment, the present invention is applied to the thermal fuse, but the present invention is not limited to this, and it is necessary to protect the lead wire when the lead wire is taken out from the support with a temperature sensitive element such as a thermostat. It can be applied to a temperature detector of a heat exchanger.

[0032]

As described above, according to the present invention, both ends of the lead wire inside the resin tube are fixed so that the end portion on the side where the lead wire is taken out protrudes slightly outward from the corresponding end portion of the support tube. Therefore, the lead wire is protected at the end of the resin tube, and the lead wire is prevented from coming into contact with the end of the support tube and being damaged. Therefore, there is no need for a rubber push for protecting the lead wire as in the past, improving workability,
The number of parts can also be reduced.

[Brief description of drawings]

FIG. 1 is an internal configuration diagram of a thermal fuse showing a first embodiment of the present invention.

FIG. 2 is an external view of the thermal fuse of FIG.

FIG. 3 is an internal configuration diagram of a thermal fuse showing a second embodiment of the present invention.

4 is an external view of the thermal fuse of FIG.

FIG. 5 is a schematic vertical sectional view of a refrigerator.

FIG. 6 is an explanatory diagram showing a main part inside the refrigerator of FIG. 5;

FIG. 7 is an explanatory view showing a mounting state of the thermal fuse.

FIG. 8 is a configuration diagram showing internal elements of a thermal fuse.

9 is a configuration diagram showing a conventional example in which the internal element of FIG. 8 is inserted into a tube or the like.

FIG. 10 is an external view of a thermal fuse showing a conventional example.

[Explanation of symbols]

 9 Thermal fuse 15 Thermal fuse element 18a, 18b Lead wire 19 Internal element 20 Tube 20a, 20b Welder part 20c Open space 22 Aluminum tube

Claims (1)

[Claims] 1. A resin having a temperature-sensitive element, lead wires connected to both ends of the temperature-sensitive element, one end side sealed to internally mount the temperature-sensitive element, and a side to which the lead wire is taken out sealed. A tube and a support tube that is made of a material having a high thermal conductivity attached to the main body side of the heat exchanger are provided inside the resin tube, and the end portion of the resin tube on the side where the lead wire is taken out is provided. A temperature detector for a heat exchanger, characterized in that the support tube and the resin tube are fixed by slightly projecting from the corresponding ends of the support tube and caulking the support tube.