JP2007115546A - Heater for temperature control - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heater for temperature control which has excellent electrical insulating properties and hermetic sealing performance, a small size and compact design. <P>SOLUTION: In this heater, terminals 3a, 3b at both ends of a resistor 3 are connected with lead wires 9, 11, respectively. The resistor 3 is covered with a double cover structure composed of an insulating inner cover 15 covering the resistor 3 totally including both the side terminals 3a, 3b, and an insulating outer cover 17 covering the inner cover 15 entirely. Moreover, both ends of the outer cover 17 are hermetically sealed by hermetic seals 21, 21 with the lead wires 9, 11 extended to the outside. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a temperature adjusting heater suitable for use in a place with high humidity and high moisture.

  As a temperature adjusting heater generally used in a place with high humidity and moisture, for example, a cord heater 103 is pasted on an aluminum foil 101 as shown in FIG. 109 is hermetically sealed so that no water intrusion occurs in the connection area.

As shown in FIG. 7, the code heater 103 has a shape in which a resistance wire 113 such as a nichrome wire is spirally wound around the glass core side 111, and the outer periphery thereof is covered with two layers of covering materials 115 and 117 on the inner side and the outer side. It has a structure. For example, there is a refrigerator.
Japanese Patent Application Laid-Open No. 11-142045

  Since the heater for temperature adjustment is a planar heater in which the code heater 103 is attached to the aluminum foil 101, the space occupied by the code heater 103 is, for example, half the current or three minutes as shown by a two-dot chain line. There is a desire to make 1 smaller. In addition, if an attempt is made to make a heater wire having a total output of 500 mm with a low output of about 2 W at 100 V, for example, a resistance wire of 10,000 Ω per meter is required. In order to achieve this, the unit resistance needs to be increased, but for that purpose, a thin line is wound in a large and dense manner to make it longer. Specifically, for example, it is necessary to use a thin resistance wire having a diameter of 0.05 mm or less and to wind the glass core with a large outer diameter of φ1 or more. For this reason, there is a physical limit to increase the unit resistance, which causes the following problems.

° Since it is easy to break because it uses thin wires.
° Since it is tightly wound, it is easy to short-circuit between pitches, and the nerves are used for work.
° Since the outer diameter of the glass core is increased, workability as a cord heater is deteriorated.
° Terminal processing is difficult and reliability is poor.
Accordingly, an object of the present invention is to provide a new temperature adjusting heater which solves the above problems.

  In order to achieve the above object, according to the present invention, a resistance having lead wires connected to terminals at both ends, an insulating inner covering material that covers the entire resistance including the terminals at both ends, and the inside A double covering structure is formed by an outer covering material covering the entire covering material, and both ends of the outer covering material are hermetically sealed in a state where the lead wire is extended to the outside.

  According to the present invention, since the heater is formed by using a resistor, it can be made small and compact. In addition, the entire resistor can be hermetically sealed in a state where insulation is ensured by a double covering structure with an inner covering material and an outer covering material, so that it is limited to places where high humidity and moisture are used. It can be installed without.

  In the present invention, first, a plurality of the resistors are connected and arranged in parallel in the outer covering material, thereby enabling a reduction in size and size, and a wide output by selecting a resistance value of each resistor. So that the heater can be obtained.

  Secondly, the inner coating material and the outer coating material are made of a transparent or translucent material in which the resistance value printed on the surface of the resistor can be seen, thereby facilitating confirmation of the resistance value used from the outside.

  Thirdly, the inner covering material is made of heat-resistant silicone rubber, and the outer covering material is made of heat-welding vinyl chloride, thereby ensuring the slipperiness of the inner covering material. While making the insertion work easy to insert, secure a tight seal by heat welding with vinyl chloride.

  Fourth, by winding an aluminum foil around the entire surface of the outer covering material, uniform heat conduction on the peripheral surface is ensured through the aluminum foil.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5.

  FIG. 1 is a schematic cutting explanatory view of a temperature adjusting heater according to the present invention.

  The temperature adjusting heater 1 has a first resistor 3 and a second resistor 5 arranged in parallel. In this embodiment, the first and second resistors 3 and 5 arranged in parallel use resistors having a resistance value of 12 kΩ in order to obtain a low output heat generation amount of about 2 to 4 W, for example.

  Each terminal 3a, 5a of the first and second resistors 3, 5 is connected in series by a U-shaped lead wire 7 covered with a covering material such as vinyl.

  Therefore, it is possible to secure a wide amount of heat generation by selecting a resistance value different from the resistance value or by increasing the number of resistors 3 and 5.

  The other terminals 3b and 5b of the first and second resistors 3 and 5 are connected to two lead wires 9 and 11 covered with a covering material such as vinyl. The lead wires 9 and 11 are extended in parallel, and their extended ends are connected to the connection connector 13, and power is supplied to the first and second resistors 3 and 5 via the connection connector 13.

  The first resistor 3 and the second resistor 5 are covered with a double covering structure of an insulating inner covering material 15 and an outer covering material 17.

  The inner covering material 15 has a tube-like shape made of transparent or translucent silicon rubber excellent in heat resistance and slipperiness, and includes the connection portions P of the terminals 3a, 3b, 5a, 5b. Thus, the entire resistor is independently coated. In this case, it is desirable that the covering region d covering each of the lead wires 7, 9, 11 is 3 mm or more where the terminals 3a, 3b, 5a, 5b and the connection portion P are not exposed.

  On the other hand, the outer covering material 17 has an elliptical tube shape made of transparent or translucent vinyl chloride excellent in heat welding property. The resistors 3 and 5 including the inner covering material 15 are inserted and arranged in the outer covering material 17, and both ends of the outer covering material 17 are extended in a state where the lead wires 9 and 11 following the connection connector 13 are extended to the outside. Is hermetically sealed by heat welding 21, 21. Thereby, water intrusion to the inside through the lead wires 9 and 11 is surely prevented.

  According to the temperature adjusting heater 1 configured as described above, since the inner covering material 15 is made of silicon rubber, the insertion work can be performed quickly and easily due to the slipperiness when the inner covering material 15 is inserted and set into the outer covering material 17. Completed and very favorable in terms of workability. In addition, after the operation is completed, the resistance values of the resistors 3 and 5 can be confirmed by visual inspection from the outside.

  Further, since the heaters are formed by using the resistors 3 and 5, the outer diameter dimension of the vertical h and the horizontal L can be reduced, and the apparatus can be made compact and compact. The first and second resistors 3 and 5 can select a resistance value or combine them to obtain a heater having a wide range of specifications. On the other hand, a double covering structure with the inner covering member 15 and the outer covering member 17 is provided. Therefore, since both ends are hermetically sealed in addition to reliable insulation, it can be used in places with high humidity and high moisture.

  Therefore, for example, as shown in FIG. 4, in the narrow partition wall 31 that partitions the ice making room 27 and the switching room 29 arranged in parallel between the refrigerator compartment 23 and the vegetable compartment 25 of the refrigerator, FIG. As shown, it can be used as a dew condensation prevention heater for the surface panel 31a of the partition wall 31.

  In this case, for example, as shown in FIG. 3, it is preferable to wind an aluminum foil 33 around the outer periphery of the outer covering material 17. Thereby, uniform heat conduction is obtained over the entire circumferential surface.

  Note that the number of resistors used may be single or plural, and the connection may be either a series connection or a parallel connection.

BRIEF DESCRIPTION OF THE DRAWINGS Partial cutting outline explanatory drawing of the heater for temperature control concerning this invention. Cross-sectional explanatory drawing of FIG. The outline explanatory drawing of the heater for temperature control which wound aluminum foil on the perimeter of an outside covering material. The outline front view of the refrigerator which implemented the heater for temperature control in the partition wall which partitions off an ice making room and a switching room. FIG. 5 is a schematic sectional view taken along line AA in FIG. 4. Explanatory drawing of the heater for temperature control which showed the prior art example. Explanatory drawing of the cutting outline which expanded the B section of Drawing 6.

Explanation of symbols

3 Resistance 3a, 3b Terminal 9, 11 Lead wire 15 Inner coating material 17 Outer coating material 21 Thermal welding (sealing seal)
33 Aluminum foil

Claims (5)

  A double-coated structure comprising a resistance having lead wires connected to terminals at both ends, an insulating inner covering material covering the entire resistance including the terminals at both ends, and an outer covering material covering the entire inner covering material On the other hand, a heater for temperature control characterized in that both ends of the outer covering material are hermetically sealed in a state where the lead wire is extended to the outside.   The temperature control heater according to claim 1, wherein a plurality of the resistors are connected and arranged in parallel in the outer covering material.   The temperature control heater according to claim 1, wherein the inner covering material and the outer covering material are made of a transparent or translucent material in which a resistance value printed on a resistance surface can be seen.   The temperature control heater according to claim 1 or 3, wherein the inner covering material is made of heat-resistant silicone rubber, and the outer covering material is made of heat-welding vinyl chloride.   The temperature adjusting heater according to claim 1, 2, 3, 4, wherein the outer covering material is wound with an aluminum foil over the entire circumferential surface.

Images