JPH0729807U - PTC thermistor device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a positive temperature coefficient thermistor device used for starting the compressor and connected to the compressor auxiliary winding, while improving the workability of the case while maintaining the conventional flame resistance performance, the number of parts To reduce costs by reducing [Composition] A thermosetting resin having excellent flame resistance and elasticity is used as a material for the case of the positive temperature coefficient thermistor device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a PTC thermistor device used for starting a compressor and connected to a compressor auxiliary winding.

[0002]

[Prior art]

 Conventionally, in electric motors such as compressors, in order to reduce the loss of the electric motor, a positive temperature coefficient thermistor element is connected in series with the auxiliary winding, and when starting, a large current is passed through the auxiliary winding to start the electric motor. Some of them are designed to cut off the current flowing through the auxiliary winding. Such a PTC thermistor device is disclosed in, for example, Japanese Utility Model Publication No. 48-3441. FIG. 3 shows a conventional plug-in type positive temperature coefficient thermistor device. (A) is an assembly plan view, (B) is an assembly front view, (C) is an exploded front view, and FIG. 4 is a conventional type. 2A and 2B show another type of positive temperature coefficient thermistor device, in which (A) is an assembly plan view, (B) is an assembly front view, and (C) is an exploded front view. First, in the positive temperature coefficient thermistor device shown in FIG. 3, reference numeral 1 is a case composed of an upper case 1a and a lower case 1b formed of an insulating material (unsaturated polyester resin or the like). Reference numerals 2 and 3 denote two external connection terminals that are detachably attached to the case 1 so as to penetrate the inside and outside of the case 1. One end of these terminals is a tab terminal (not shown) for connection with an external electric circuit. However, the other end is provided with a receptacle (not shown) for connecting to the terminal of the compressor. Eyelets and eyelet holes 4 and 5 are used for assembling and fixing the upper case 1a and the lower case 1b. Next, in the PTC thermistor device shown in FIG. 4, 11 is a case body formed of an insulating material (unsaturated polyester resin or the like), 12 is a case lid, and 13 is a stop screw. Reference numerals 14 and 15 denote two external connection terminals detachably attached to the case 11 so as to penetrate the inside and outside of the case body 11. 16 is a hole for fixing the case lid fixing screw. In designing the case of the PTC thermistor device as shown in FIGS. 3 and 4, it is needless to set the heat distortion temperature to a high temperature because the PTC thermistor element has a high temperature of 170 to 180 ° C. In order to prevent smoke and ignition outside the case even if an abnormality such as element destruction occurs, it is common to use a thermosetting resin with excellent flame resistance and tracking resistance that does not cause thermal deformation of the case.

[0003]

[Problems to be solved by the device]

 However, since the thermosetting resin used in the conventional PTC thermistor device shown in FIGS. 3 and 4 has almost no elasticity and is easily chipped by an impact or the like, the thermosetting resin between the cases of the PTC thermistor device is In addition to requiring auxiliary parts such as screws and eyelets for connection and installation to the product, it is necessary to attach the case with due consideration for caulking strength and screw tightening torque. was there.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is a positive temperature coefficient thermistor device used for starting a compressor and connected to a compressor auxiliary winding, and has excellent flame resistance and elasticity as a material of the case of the positive temperature coefficient thermistor device. It is intended to provide a PTC thermistor device using a certain thermosetting resin.

[0005]

[Action]

 The PTC thermistor device according to the present invention uses a thermosetting resin, which has excellent flame resistance and elasticity and is used for the case of the PTC thermistor device, to improve the mounting workability of the case while maintaining the conventional flame resistance. Further, the cost can be reduced by reducing the number of parts.

[0006]

【Example】

 An embodiment of a positive temperature coefficient thermistor device according to the present invention, which is used for starting a compressor and is connected to a compressor auxiliary winding, will be described below with reference to FIGS. 1 and 2. 1 is an exploded front view of a first embodiment of a PTC thermistor device according to the present invention, and FIG. 2 is an exploded front view of a second embodiment of a PTC thermistor device according to the present invention. First, the first embodiment shown in FIG. 1 is an improvement of the conventional PTC thermistor device shown in FIG. 3. In FIG. 1, 21a is an upper case provided with a snap-in female portion 22a, and 21b is A snap-in male part 22b is provided in the lower case and snap-in coupled to form a case. As the material of the upper case 21a and the lower case 21b, a thermosetting resin having excellent flame resistance and elasticity is used. Next, a second embodiment shown in FIG. 2 is an improvement of the conventional type positive temperature coefficient thermistor device shown in FIG. 4. In FIG. 2, 31 is a case body, 31a is a flange, 32 is a case lid, The case body 31 and the case lid 32 are provided with a snap-in female portion 36b and a snap-in male portion 36a, respectively, and are snap-in coupled to form a case. In addition, a snap-in male portion is provided on the flange 31a of the case main body to enable snap-in connection with the compressor. 34 and 35 are connection terminals. The case body 31 and the case lid 32 are made of a thermosetting resin which has excellent flame resistance and elasticity.

[0007]

[Effect of device]

 Since the positive temperature coefficient thermistor device according to the present invention is configured as described above, it is possible to improve the workability of mounting the case while maintaining the conventional flame resistance, and further reduce the cost by reducing the number of parts. The effect is that you can do it.

[Brief description of drawings]

FIG. 1 is an exploded front view of a positive temperature coefficient thermistor device according to a first embodiment of the present invention.

FIG. 2 is an exploded front view of a second embodiment of the positive temperature coefficient thermistor device according to the present invention.

3A and 3B show a conventional plug-in type positive temperature coefficient thermistor device, in which FIG. 3A is an assembly plan view, FIG. 3B is an assembly front view, and FIG. 3C is an exploded front view.

4A and 4B show another conventional type positive temperature coefficient thermistor device, in which FIG. 4A is an assembly plan view, FIG. 4B is an assembly front view, and FIG. 4C is an exploded front view.

[Explanation of symbols]

 21a: Upper case 21b: Lower case 22a: Snap-in female part 22b: Snap-in male part 31: Case body 32: Case lid 34, 35: Connection terminal 36a: Snap-in male part 36b: Snap-in female part 37a: Snap-in Male part

Claims (1)

[Scope of utility model registration request] 1. In a PTC thermistor device used for starting a compressor and connected to a compressor auxiliary winding, a thermosetting resin having excellent flame resistance and elasticity is used as a material of a case of the PTC thermistor device. A positive temperature coefficient thermistor device.