JP3061528U - Positive thermistor device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Even if the outer case itself stores heat due to the heat generated by the positive temperature coefficient thermistor by a simple configuration change, it is reliably prevented from adversely affecting peripheral components. SOLUTION: Cavities 11a and 11b forming an air layer
Case 1 in which an outer wall portion 10 for heat insulation is provided at least outside the portion corresponding to the accommodation position of the positive temperature coefficient thermistor 2
Is provided.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an improvement of a positive temperature coefficient thermistor device used for preventing freezing of a water supply pipe or a door of an ice tray or a freezing of a water pipe in a refrigerator, for example.

[0002]

[Prior art]

 Conventionally, a positive temperature coefficient thermistor device of this type includes a bottomed cylindrical outer case 1 formed of an insulating resin as shown in FIG. 6, and includes a positive temperature coefficient thermistor 2 as a heating element and a positive temperature coefficient thermistor 2. The electrode plates 3 and 4 applied to the opposing electrodes are assembled, and the electrode plates 3 and 4 are accommodated in the exterior case 1 with the support plate 5 interposed therebetween. Lead wires (not shown) that are electrically connected to the external case 1 and 4 are drawn out of the outer case 1 through an open port, and the open port of the outer case 1 from which the lead wires are drawn out is sealed with a resin mold. Is known (Japanese Utility Model Laid-Open No. 5-66903).

In the positive temperature coefficient thermistor device, since the outer case 1 has a bottomed cylindrical shape and an open port for leading a lead wire is sealed with a resin mold, the outer case 1 itself has a positive temperature coefficient thermistor. It is easy to store heat due to the heat of 2. For this reason, for example, when a water supply pipe of an ice tray in a refrigerator is used as an attached body, the styrene foam having a melting temperature of about 70 ° C., which is disposed around the water supply pipe and has heat resistance, melts to prevent the freezing. There is a concern that there will be no impact on the surrounding area.

In the positive temperature coefficient thermistor device, an outer case 1 is applied to a side surface of a body to be mounted on a flat side surface, and is held from the outside by a metal tightening band, and the ends of the tightening band are tightened by bolts and nuts. By doing so, it is fixed to the side surface of the attached body. However, this is not preferred because not only is the mounting state of the entire apparatus unstable, but also the tightening of the tightening band with the bolts and nuts takes time and effort, resulting in high costs.

[0005]

[Problems to be solved by the invention]

 The present invention provides a positive temperature coefficient thermistor device that can reliably prevent peripheral components from being adversely affected even when the outer case itself stores heat by the heat of the positive temperature coefficient thermistor by a simple configuration change. With the goal.

In addition, an object of the present invention is to provide an inexpensive positive temperature coefficient thermistor device that can stably and easily mount the entire device including an outer case to an object to be mounted.

[0007]

[Means for Solving the Problems]

 The positive temperature coefficient thermistor device according to claim 1 of the present invention includes a bottomed cylindrical outer case formed of an insulating resin, and a positive temperature coefficient thermistor serving as a heating element and electrodes facing the positive temperature coefficient thermistor. The electrode plate to be applied is assembled and housed inside the outer case, and the lead wire electrically connected to each electrode plate is drawn out from the opening of the outer case, and the lead wire is drawn out of the outer case. The open port is sealed with a resin mold, and is provided with an outer case having an outer wall for heat insulation provided at least outside the cavity corresponding to the positive temperature coefficient thermistor, with a cavity forming an air space therebetween. ing.

[0008] The positive temperature coefficient thermistor device according to claim 2 of the present invention is provided with an outer case having an outer wall portion for heat insulation provided at least outside the space corresponding to the accommodating position of the positive temperature coefficient thermistor with a penetrated cavity interposed therebetween. It consists of.

In the positive temperature coefficient thermistor device according to claim 3 of the present invention, an exterior case is provided in which an outer wall portion for heat insulation is provided at least on an outer side corresponding to a housing position of the positive temperature coefficient thermistor across a hollow portion having a multiple structure. It is constituted by having.

[0010] The PTC thermistor device according to claim 4 of the present invention is provided with an exterior case provided with a concave portion that fits into the side surface of the attached body, on one side surface other than the outer wall portion for heat insulation. It is configured.

In the PTC thermistor device according to claim 5 of the present invention, the outer case is applied to the side surface of the attached body and tightened from the outside, and the protruding piece at one end is inserted into the slit at the other end to be folded. It is configured with a crimping band that stops bending.

The positive temperature coefficient thermistor device according to claim 6 of the present invention is configured by including a crimping stop band having an arc-shaped spring portion for pressing and holding the outer case.

[0013]

[Embodiment of the invention]

 Hereinafter, a description will be given with reference to FIGS. 1 to 5 together with FIG. 6. The illustrated positive temperature coefficient thermistor device includes a bottomed cylindrical outer case 1 formed of an insulating resin and a heating element as shown in FIG. The positive temperature coefficient thermistor 2, the electrode plates 3 and 4 applied to each of the electrodes facing the positive temperature coefficient thermistor 2, the support plate 5 interposed between the electrode plates 3 and 4, , And lead wires 6 and 7 connected thereto.

In this PTC thermistor device, the basic components are configured to have the same structure as that of FIG. 6 except for the outer case 1 having a unique component. The common components are denoted by the same reference numerals as those in FIG. 6, and the attached components other than the above-described components are described based on those in FIG.

The outer case 1 has a bottomed cylindrical shape as a basic form, and as shown in FIG. 2, an outer wall portion 10 for heat insulation has at least a positive characteristic across hollow portions 11 a, 11 b, 12, 13 forming an air layer. It is provided outside corresponding to the accommodation position of the thermistor 2. The outer wall portion 10 is provided so as to surround three side surfaces except one side which is a surface to be applied to a body to be described later.

In the outer wall portion 10, hollow portions 11 a, 11 b, 12, and 13 are separately provided in respective portions surrounding three side surfaces. Each of the cavities 11a, 11b, 12, and 13 is provided so as to penetrate therethrough. Among them, a main portion corresponding to the electrode of the positive temperature coefficient thermistor 2 is provided with two superposed multi-layered structures 11a and 11b.

The outer wall portion 10 is not limited to the illustrated embodiment, and can be appropriately designed and changed so as to be provided only on the main portion corresponding to the electrode of the positive temperature coefficient thermistor 2 or separately on both side surfaces. Further, the present invention is not limited to the case where it is formed integrally with the outer case 1, and a separately formed product may be assembled to the outer case 1.

With respect to the outer case 1, the positive temperature coefficient thermistor 1 applies the electrode plates 3 and 4 to the electrodes facing each other, and assembles the support plate 5 with the support plate 5 interposed between the electrode plates 3 and 4. The wires 6 and 7 are assembled so as to be electrically connected to the electrode plates 3 and 4, and are housed in the exterior case 1.

As shown in FIGS. 1 and 6, the electrode plates 3 and 4 have dowel protrusions 5 a, 5 b and 5 c protruding from the application surface of the support plate 5, and holes formed on the plate surfaces of the electrode plates 3 and 4. 3a, 4a, and 4b (symbols are only in FIG. 6), and the supporting ends are bent by bending the leading end sides of the electrode plates 3 and 4 into a U-shape and fitted to the overhanging pieces 5d of the support plate 5. It can be stably assembled to the plate 5. In addition, one of the electrode plates 3 and 4 may be provided with a narrow portion 4c (shown only in FIG. 6) serving as an overcurrent fusing portion.

The positive temperature coefficient thermistor 2 is stably assembled because a spring piece 3 b provided by bending one end of the electrode plate 3 is pressed into the inside of the outer case 1. The positive temperature coefficient thermistor 2 is housed inside the outer case 1, and the lead wires 6, 7 electrically connected to the respective electrode plates 3, 4 are drawn out from the opening of the outer case 1, and the lead The open case of the outer case 1 from which the lead wires 6 and 7 are drawn out is sealed with a resin mold 8 to assemble a positive temperature coefficient thermistor device.

In the positive temperature coefficient thermistor device configured as described above, even if the outer case 1 stores heat by the heat generated by the positive temperature coefficient thermistor 2, it is thermally insulated across the cavities 11 a, 11 b, 12, and 13 forming the air layer. Is provided, the heat generated by the positive temperature coefficient thermistor 2 directly acts on the surrounding components even when the outer wall 10 is adjacent to the surrounding components when the device is mounted. Can be prevented by the outer wall portion 10.

Since the hollow portions 11a, 11b, 12, 13 are provided so as to penetrate with the outer wall portion 10, an air flow passing through the hollow portions 11a, 11b, 12, 13 is generated. An air cooling function for dissipating the heat stored in the case 1 can also be exhibited. The heat insulation and the air cooling function can be ensured more effectively because they have a multi-layered structure in which two or more cavities are overlapped.

The PTC thermistor device is used, for example, to prevent freezing of a water supply pipe and a door of an ice tray in a refrigerator or freezing of a water pipe. The illustrated embodiment exemplifies a cylindrical body such as a water supply pipe P of an ice tray in a refrigerator as an attached body, and a side surface of the attached body is provided on one side except for providing an outer wall portion 10 for heat insulation. There is provided a recess 14 that fits into the recess.

The recess 14 is provided as an arc-shaped depression corresponding to the side surface of the water supply pipe P. Since the outer case 1 is fitted to the side surface of the attached body by the concave portion 14, the entire apparatus is stably assembled to the attached body.

As shown in FIG. 3, the positive temperature coefficient thermistor device is provided with a metal caulking stop band 9 for fixing the outer case 1 to the side surface of the body P to be fastened from the outside. As shown in FIG. 4, the crimping stop band 9 includes a band portion 90 having a substantially U-shape holding the PTC thermistor device and band portions 91 and 92 having an arc shape along the side surface of the water supply pipe P. It is bent continuously.

As shown in FIG. 4, the crimping stopper band 9 has a projecting piece 93 at one end inserted into a slit 94 at the other end (see FIG. 3), and as shown in FIG. Can be held by tightening the PTC thermistor by tightening it by overlapping it with the other end. As a result, the positive characteristic thermistor device can be tightened and fixed by a simple operation without the need for bolts and nuts in the swaging band 9.

In addition, the crimping stop band 9 is provided with an arc-shaped spring portion 95 for pressing the outer case 1 by pressing the outer case 1 by bending the bridge side of the U-shaped band portion 90 into an arc shape. Can be Due to this arcuate spring portion 95, the PTC thermistor device can be tightly pressed against the side surface of the attached body, and can be stably and firmly attached and fixed.

[0028]

[Effect of the invention]

 As described above, according to the positive temperature coefficient thermistor device according to claim 1 of the present invention, the outer wall portion for heat insulation is provided at least outside the cavity corresponding to the storage position of the positive temperature coefficient thermistor with the cavity forming the air layer therebetween. Since the outer case is provided, even if the outer case accumulates heat due to the heat generated by the positive temperature coefficient thermistor, the outer wall portion is located adjacent to the surrounding components through the cavity forming the air layer. The heat generated by the thermistor can be prevented from directly acting on the surrounding components by the outer wall portion, so that accurate freezing can be achieved.

According to the PTC thermistor device according to claim 2 of the present invention, the exterior case having the outer wall portion for heat insulation provided at least on the outer side corresponding to the accommodation position of the PTC thermistor with the penetrated hollow portion interposed therebetween. By providing the air conditioner, an air cooling effect of dissipating heat stored in the exterior case by the air flow passing through the cavity can also be exhibited.

According to the PTC thermistor device according to claim 3 of the present invention, the outer case having the outer wall portion for heat insulation provided at least outside the cavity corresponding to the accommodation position of the PTC thermistor with the cavity of the multi-layer structure interposed therebetween. , More effective heat insulation and air cooling can be ensured.

According to the PTC thermistor device according to claim 4 of the present invention, the outer case provided with a concave portion that fits into the side surface of the attached body is provided on one side surface other than the outer wall portion for heat insulation. This allows the outer case to be fitted to the side surface of the attached body and applied, so that the entire device can be stably assembled to the attached body.

According to the PTC thermistor device according to claim 5 of the present invention, the outer case is applied to the side surface of the attached body and tightened from the outside, and the protruding piece at one end is inserted into the slit at the other end. By providing a crimp-stop band that prevents bending, the entire device including the exterior case can be attached by simple work, and costs can be reduced because bolts and nuts are not required.

According to the PTC thermistor device according to claim 6 of the present invention, the entire device is provided by the side surface of the body to be mounted by providing the caulking stop band having the arc-shaped spring portion for pressing the outer case elastically. It can be firmly and firmly fixed by firmly pressing against the

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a positive temperature coefficient thermistor device according to the present invention.

FIG. 2 is a perspective view showing an outer case constituting the PTC thermistor device of FIG. 1;

FIG. 3 is a plan view showing the PTC thermistor device of FIG. 1 applied and fixed to an attached body.

FIG. 4 is a cross-sectional view of the positive-characteristic thermistor device, showing a procedure for applying and fixing the positive-characteristic thermistor device of FIG.

FIG. 5 is an explanatory view showing a fixing structure of the positive temperature coefficient thermistor device of FIG. 1 by a crimping band in a cross section of the positive temperature coefficient thermistor device.

FIG. 6 is an explanatory diagram showing a positive temperature coefficient thermistor device according to a conventional example disassembled for each constituent member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exterior case 10 Outer wall part 11a, 11b, 12, 13 Hollow part 11a, 11b Hollow part of a multiple structure 14 Depression 2 Positive temperature coefficient thermistor 3, 4 Electrode plate 6, 7 Lead wire 8 Resin mold 9 Crimp stop band 93 Protrusion piece 94 Slit 95 Spring part

Claims (6)

[Utility model registration claims] 1. An outer case comprising a bottomed cylindrical outer case formed of an insulating resin, wherein a positive temperature coefficient thermistor as a heating element and an electrode plate applied to each of the electrodes facing the positive temperature coefficient thermistor are assembled. Positive characteristic that the lead wire that is electrically connected to each electrode plate is drawn out from the opening of the outer case, and the opening of the outer case from which the lead wire is drawn is sealed with resin mold. A positive temperature coefficient thermistor device comprising: a thermistor device; and an outer case provided with an outer wall portion for heat insulation at least outside corresponding to a housing position of the positive temperature coefficient thermistor with a cavity forming an air layer therebetween. 2. The positive case according to claim 1, further comprising: an outer case having an outer wall portion for heat insulation provided at least outside the portion corresponding to the accommodation position of the positive temperature coefficient thermistor with a penetrated hollow portion interposed therebetween. Characteristic thermistor device. 3. The outer case according to claim 1, further comprising an outer case having an outer wall portion for heat insulation provided at least outside the cavity corresponding to the accommodation position of the positive temperature coefficient thermistor with the cavity portion having a multi-layer structure therebetween. The described positive characteristic thermistor device. 4. The positive temperature coefficient thermistor according to claim 1, further comprising an outer case provided on one side other than the outer wall portion for heat insulation, and provided with a concave portion fitted to the side surface of the attached body. apparatus. 5. A caulking stop band which applies an outer case to a side surface of an attached body, tightens the outer case, and inserts a protruding piece at one end into a slit at the other end to prevent bending. The positive temperature coefficient thermistor device according to claim 4. 6. The positive temperature coefficient thermistor device according to claim 5, further comprising a crimp stop band having an arcuate spring portion for holding the outer case.