JP3627285B2 - Temperature sensor - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a temperature sensor for detecting the temperature of an object to be heated in contact with the object to be heated in a cooker, and more particularly to a means for electrically insulating a lead wire connected to a thermistor of the temperature sensor.
[0002]
[Prior art]
In a conventional temperature sensor of this type, as shown in FIG. 6, two electric conducting wires 2 are led out from the thermistor 1 and connected to a lead wire 3. The electric conducting wire 2 is generally a single wire such as a dumet wire, and is inserted into a tube A4 shaped of a polyimide resin, covered with a Teflon resin 5, and a twisted wire or a single wire in which several fine wires are twisted around the core wire 6. The lead wires 3 are electrically connected, and tubes B8 are individually provided in the electrical connection portions 7 to have an electrically insulating structure between the lead wires 5. Two lead wires 3 led out from the tube 4 are twisted. It is made into one shape and inserted through the tube C9. In addition, the normal heat-resistant temperature of the polyimide resin used as an insulator is about 400 degreeC , and a Teflon resin is about 260 degreeC.
[0003]
[Problems to be solved by the invention]
However, in the configuration as described above, the two lead wires 5 connected to the electric conducting wire 2 are twisted together to form a single wire and further covered with a tube B 8 formed of polyimide resin. The lead wire 5 in the portion where the tube B 8 is provided exists between the lead wire 5 twisted at a normal heat-resistant temperature of 400 ° C. of polyimide resin, but the twisted lead wire 5 (A in FIG. 6) -A cross-section of FIG. 7 showing a cross section) Since the core wire 6 is coated with Teflon resin, the normal heat-resistant temperature is 260 ° C.
[0004]
Therefore, when a high temperature of 260 ° C. or higher is applied to the twisted lead wire 5 portion, the Teflon resin coating is dissolved and the core wire 6 is in electrical contact, and the normal heat resistant temperature of 400 ° C. of the polyimide resin cannot be obtained. Further, when the thermistor 1 touches an atmosphere with a temperature change, the resistance change between the lead wires 5 is originally detected, but the resistance change cannot be detected, and therefore the temperature change cannot be detected. It was.
[0005]
In addition, the heat-resistant temperature of the temperature sensor having such a configuration is 260 ° C., and the temperature sensor installation place is 260 ° C. or less, and it is necessary to devise the construction of the installation place to protect this value. Had.
[0006]
Further, since the tube A4 and the tube B8 are each divided, there is a problem in that when the electric conductor 2 is bent, the electric conductor 2 is exposed from the bent portion and an electric short circuit occurs in the divided portion. Had.
[0007]
The present invention solves this conventional problem, and increases the normal heat resistance temperature of the temperature sensor thermistor and lead wire portion to increase the temperature heat resistance temperature of the temperature sensor, so that the installation location of the temperature sensor can be selected more freely. The object is to obtain a temperature sensor.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, the temperature sensor of the present invention is configured such that a heat collecting plate holding a thermistor is fixed to a holder, an electric wire is taken out from a thermistor covered with an insulator, and the electric wire is covered with an insulator. Separately connect the lead wires individually , cover both the electrical conductors and both the lead wires including the lead wire and the connecting portion of the electrical conductors with a high heat resistant resin tube, and cover the high heat resistant resin tube. The lead wire covered with the high heat resistant resin tube and the lead wire covered with the high heat resistant resin tube is covered with the non-combustible material braided tube.
[0009]
[Action]
In the present invention, the electrical conductors taken out of the thermistor and the lead wires connected to the electrical conductors are individually covered with a high heat-resistant resin tube to protect the electrical conductors and the lead wires individually. The lead wire is coated with a low heat resistant resin and exposed to a temperature higher than the heat resistant temperature. Even if the coating is melted, the high heat resistant resin becomes an insulator between the wires, and an electrical short circuit does not occur between the two wires.
[0010]
In addition, since the electrical conductors and lead wires were covered with a high heat resistant resin and then inserted into the non-combustible material braided tube, the high heat resistant resin was exposed to a higher temperature to cover each wire (low heat resistant resin) and the high heat resistant resin. Even if it melts, since it is further covered with a non-combustible material braided tube, an electrical short between the lines does not occur.
[0011]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the same number is attached | subjected to the component which has the same function and the same effect | action as a prior art example, and description is abbreviate | omitted.
[0012]
In FIG. 1 to FIG. 5, reference numeral 10 denotes a temperature sensor, and the thermistor 1 is fixed to a heat collecting plate 11 with a mounting plate 12, and the heat collecting plate 11 is fixed to a holder 13. The holder 13 is held by a shaft 14 and is kept at a predetermined position of the cooking device 15. The temperature sensor 10 in the cooker 15 is held at the center of the burner 16 and comes into contact with the object to be heated 18 when the object to be heated is placed on the gotok 17. The object to be heated is heated by the flame 19 of the burner 16. Reference numeral 20 denotes a high heat-resistant resin tube D in which the tube A4 through which the electric conducting wire 2 of the thermistor 1 is inserted and the tube B8 through which the electric connecting portion 7 is inserted are integrated. Reference numeral 21 denotes a non-combustible material braided tube that covers a part of the tube B 8 provided on the lead wire 5 and braids a non-combustible material that covers the lead wire 5. The non-combustible material braided tube 21 covers a part or all of the lead wire 5. The non-combustible material braided tube 21 provided and including the lead wire 5 is inserted into the shaft 14 and wired in the cooking device 15.
[0013]
In the above configuration, the temperature sensor 10 is in contact with the bottom surface of the heated object 18 when the flame 19 is formed on the burner 16 of the cooking device 15 to heat the heated object 18. At this time, the temperature sensor 10 contacts the heated object 18 with the heat collecting plate 11, and the thermistor 1 attached to the heat collecting plate 11 senses the temperature change and detects the temperature of the heated object 18 between the lead wires 3. Information is converted into resistance change and output. The cooker 15 is configured to be controlled by the resistance change that is the temperature information. When the burner 16 of the cooking device 15 used in this way becomes hot, the lead wire 3 receives heat through the shaft 14 and the non-combustible material braided tube 21 and rises in temperature. At this time, when the core wire 6 of the lead wire 3 is covered with Teflon resin, the shape of the Teflon resin is maintained without melting until it reaches 260 ° C. However, when the temperature rises to 260 ° C. or higher, the core wire 6 melts. However, since it is protected by the non-combustible material braided tube 21, the two lead wires 3 do not contact each other and cause an electrical short circuit.
[0014]
Therefore, the temperature sensor 10 detects the temperature change of the object 18 to be heated as the resistance change of the thermistor 1 through the heat collecting plate 11 and controls the operation of the cooker 15, and the lead wire 3 is electrically connected as in the conventional example. There is an effect that a short circuit is caused and the thermistor 1 resistance is zero or minimal.
[0015]
Further, noncombustible braided tube 21 has been coated lead wire 3 covers a portion of the tube B 8, noncombustible braided tube 21 in place of the tube D20 when the more the temperature sensor 10 of the high heat temperature is required Can be obtained by inserting.
[0016]
High heat-resistant resin tube A4, tube B 8 for obtaining high heat of the temperature sensor 10 as described above, the tube D20 is specifically a polyimide resin or a polyamide resin is composed, nonflammable braided tube 21, glass fiber It is a glass braided tube that weaves.
[0017]
Further, according to the present invention, the tube D20 is integrally covered from the electric conducting wire 2 to the lead wire 5, so that even if the high heat-resistant resin coating portion is bent, the waist does not break, so that the electric conducting wire 2 starts from the boundary portion between the tube A4 and the tube B8. Will not be exposed and short-circuit between the two.
[0018]
【The invention's effect】
As is clear from the above description, according to the temperature sensor of the present invention, the following effects can be obtained.
[0019]
(1) A non-combustible material braid in which a high-heat-resistant resin coating is provided on the electrical lead wire and lead wire derived from the thermistor of the temperature sensor, and an electrical insulator is woven into the lead wire and high-heat resin partially or entirely with high heat resistance Since the tube is inserted, the temperature sensor always operates normally without any electrical short between the wires.
[0020]
(2) Electrical shorts between the temperature sensor wires were prevented by increasing the heat-resistant temperature of the insulating material covering each wire and using a non-combustible material braided tube, so when the temperature sensor was installed in a cooker The temperature sensor operates normally without special heat shields or heat shields.
[0021]
(3) Since the electric conductors from the thermistor are bundled and provided with an integral covering, the rigidity is increased, and it always operates normally without causing an electrical short-circuit even when bent.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of main parts of a temperature sensor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of main parts of a thermistor and a lead wire part mounted on the temperature sensor. [Fig. 4] External view of a cooker equipped with the same temperature sensor [Fig. 5] Cross-sectional view of the main part of the cooker [Fig. 6] Cross-sectional view of the main part of the thermistor and the lead wire constituting the conventional temperature sensor [ FIG. 7 is a cross-sectional view taken along line AA in FIG.
1 Thermistor 2 Electrical conductor 5 Lead wire 11 Heat collecting plate 13 Holder 21 Non-combustible material braided tube D High heat resistant resin tube

Claims (3)

In a temperature sensor comprising a metal heat collecting plate that holds the thermistor inside and that contacts the object to be heated and a holder fixed to the heat collecting plate, the electric conductor is taken out from the thermistor, and an insulator is provided on the electric conductor. in connecting the coated lead wires, both lead including a connection portion of both and the lead wire and the electric wire of the electric wire was coated with a highly heat resistant resin tube, and to cover the high heat resistant resin tube A temperature sensor in which both of the lead wires covered with another high heat resistant resin tube and the high heat resistant resin tube are covered with a non- combustible material braided tube. A glass braided tube is used as a non-combustible material braided tube for covering the lead wire covered with the tube as a high heat-resistant resin tube covering the electrical lead wire and the lead wire from the thermistor. The temperature sensor according to claim 1 used . Cover both the electrical conductors and both the lead wires and the lead wires including the connecting portions of the electrical conductors with a high heat resistant resin tube formed of polyimide or polyamide resin, and bundle the individually coated high heat resistant resin tubes to separate The temperature sensor according to claim 1 , wherein the heat-resistant resin tube is covered with a high heat-resistant resin tube to form a multi-layered structure, and the high-heat-resistant resin tube laminated is integrally formed in the entire covering region.

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