JPH0334883Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a positive temperature coefficient thermistor device used as a starting relay for a single-phase motor using a positive coefficient thermistor.

BACKGROUND ART Conventionally, this type of positive temperature coefficient thermistor device has a configuration as shown in FIGS. 4 to 6. FIG. 4 is a sectional view thereof, FIG. 5 is a front view thereof, and FIG. 6 is a perspective view of a spring terminal used therein. Fourth
In Figures 1 to 6, 1 is a positive temperature coefficient thermistor with electrodes on both sides (not shown), 2 is a spring terminal plate made of phosphor bronze, etc., and the positive temperature coefficient thermistor 1 is
It is pressed against the electrode surface of the electrode, and is loaded inside an insulating case 3 made of phenol resin or the like. Reference numeral 4 denotes a donut-shaped insulating plate made of a mica plate or the like, which is used to position the positive temperature coefficient thermistor. Reference numeral 5 denotes a lid made of phenol resin or the like, which is fixed to the insulating case 3 with eyelets 6. In addition, the end of the terminal board is provided with a section a that serves as a power supply terminal from the outside, and the insulating case 3 has a hole b for mounting.
is provided.

FIG. 7 is a circuit diagram using this, and FIG. 8 is its actual diagram. As described above, the conventional positive temperature coefficient thermistor device has only one pair of terminals, so that the wiring becomes complicated when it is actually used.
In FIGS. 7 and 8, 8 is a positive temperature coefficient thermistor device, and 9 is a starting capacitor. The compressor motor M has a main winding L and an auxiliary winding L, and the auxiliary winding L is connected in series with a parallel circuit of a positive temperature coefficient thermistor device 8 and a capacitor 9.
The motor M is provided with terminals c, d, and e.

Problems to be Solved by the Invention This conventional configuration had the following drawbacks. That is, during assembly, the terminal board 2 must be pressed against the PTC thermistor 1 while being inserted into the box-shaped insulating case 3, which makes assembly difficult, and in some cases, the terminal board and the PTC thermistor may and must be inserted while shifting them relative to each other,
The electrode surface of the positive temperature coefficient thermistor is scratched, and as a result,
There was a risk that poor contact would occur and lead to serious defects.

Furthermore, because one component serves as both a component that requires springiness and a terminal that conducts electricity, the characteristics required for this component cannot be sufficiently obtained. For the former,
Heat resistance and mechanical strength are required, and the latter requires a material with high conductivity and low contact resistance, especially when used as a relay for starting a motor, as a current of 10A or more will flow instantaneously. . For example, if phosphor bronze is used for the terminal board as shown in the conventional example, it has high conductivity but low heat resistance, so the strength of the spring decreases after long-term use, resulting in poor contact.
Furthermore, when stainless steel is used, although it has strength and heat resistance, it has a high contact resistance with the electrodes of the positive temperature coefficient thermistor, and this also causes poor contact due to local heat generation at the contact portion when used for a long period of time. In addition, a copper-titanium alloy is a material that has both of these characteristics, but this is extremely expensive and disadvantageous in terms of cost.

The present invention aims to provide a positive temperature coefficient thermistor device that can solve the above problems.

Means for Solving the Problem In order to solve this problem, the present invention consists of a positive temperature coefficient thermistor, two contact plates that are pressure-welded to the opposing electrode surfaces, and an external contact plate that is fixed to the contact plate. A terminal board that serves as a power supply terminal from the PTC thermistor is inserted between the bottomed insulating case and the lid, the insulating case or the lid, and one of the contact plates, and the positive temperature coefficient thermistor is connected to both electrode surfaces of the PTC thermistor from both sides. It consists of a spring that presses the contact plate, and an eyelet that secures the insulating case and lid together, and a positive temperature coefficient thermistor is installed in the insulating case so that the electrode surface is parallel to the bottom of the insulating case. , the above-mentioned terminal board is perpendicular to the electrode surface of the PTC thermistor and is fixed in an insulating case and lid so that it cannot be attached or removed, and one end of the terminal board is in the shape of a faston tab terminal and is attached to the outside of the case. The other end is in the shape of a faston receptacle, and its periphery is covered with an insulating case.

Function: With this configuration, the contact plate and spring that are pressed into contact with the electrode surface of the PTC thermistor can be made of different materials, and the characteristics required for each component can be obtained sufficiently, resulting in high reliability. In addition, since the bottom surface of the insulating case and the electrode surface of the PTC thermistor are parallel to each other, assembly can be performed by sequentially inserting the spring, contact plate, PTC thermistor, and the other contact plate. It is easy to assemble and eliminates the risk of scratching the electrode surface of the positive temperature coefficient thermistor. Furthermore, since the external terminals are in the form of a Faston tab terminal and a Faston receptacle, one pair each on the top and bottom, they can be directly press-fitted into the tab terminals of the capacitor, simplifying wiring.

Embodiment FIGS. 1 to 3 show embodiments based on the present invention. FIG. 1 is a top view, FIG. 2 is a front sectional view, and FIG. 3 is an actual circuit diagram using the same. Figure 1,
In FIG. 2, numeral 10 is a positive temperature coefficient thermistor with electrodes (not shown) on both sides, and numeral 11 is a pair of soft stainless steel sheets (for example,
The contact plates are made of SUS430), and the positive temperature coefficient thermistor 1 is sandwiched between these contact plates. 1
2 is a spring made of hard stainless steel (for example, SUS310), and insulation case 13 is made of phenolic resin.
The two contact plates 11 are in pressure contact with the positive temperature coefficient thermistor 1. 14 is a terminal plate made of brass, which is the same as the contact plate 1 above.
1 and are connected by caulking or the like. The upper end g of the terminal plate 14 is in the shape of a Faston tab, and the lower end h is in the shape of a Faston receptacle. Reference numeral 15 denotes a lid made of phenol resin, which is fixed to the insulating case 15 through eyelets 16. Further, by fixing the insulating case and the lid together, the terminal plate 14 can be made non-removable, and the portion h of the Faston receptacle is covered with a part of the insulating case 13.

In FIG. 3, 17 is a positive temperature coefficient thermistor device according to the present invention, and 18 is a starting capacitor.
The receptacle of the terminal plate of the positive temperature coefficient thermistor device 17 is press-fitted directly into the tab terminal of the capacitor.

Effects of the invention As described above, according to the invention, the assembly is easy, the PTC thermistor is less likely to be damaged, the contact resistance between the contact plate and the electrode of the PTC thermistor is small, and the pressure welding force is strong. It is possible to provide a positive temperature coefficient thermistor device that is highly reliable and has no failures. Furthermore, when implemented as a motor starting relay, wiring is simple and the installation space is small.

[Brief explanation of drawings]

FIG. 1 is a top view showing a positive temperature coefficient thermistor device according to an embodiment of the present invention, FIG. 2 is a front sectional view thereof,
FIG. 3 is an actual circuit diagram when this is used as a relay for starting a motor. Figure 4 is a top sectional view showing a conventional positive temperature coefficient thermistor device, Figure 5 is its front view, Figure 6 is a perspective view of the spring terminal, and Figure 7 is a circuit diagram when used in a motor starting relay. 8 is an actual circuit diagram when a conventional positive temperature coefficient thermistor device is used. 10... Positive characteristic thermistor, 11... Contact plate,
12...Spring, 13...Insulation case, 14
...Terminal board, 15 ... Lid body, 16 ... Eyelet, 1
8... Starting capacitor.

Claims (1)

[Scope of utility model registration request] A positive temperature coefficient thermistor, two contact plates that are press-contacted to both opposing electrode surfaces, a terminal plate that is fixed to the contact plates and serves as a power supply terminal from the outside, an insulating case with a bottom, and a lid body; A spring is inserted between the insulating case or cover and one of the contact plates, and presses the contact plate against both electrode surfaces of the PTC thermistor from both sides, and the insulating case and cover are fixed together. The positive temperature coefficient thermistor is installed in the insulation case so that the electrode surface is parallel to the bottom of the insulation case, and the terminal plate is mounted in the insulation case so that the electrode surface is perpendicular to the electrode surface of the positive temperature coefficient thermistor. The terminal board is fixed in a non-removable manner with a lid, and one end of the terminal board has the shape of a Faston tab terminal and protrudes outside the case, and the other end has the shape of a Faston receptacle, and is surrounded by an insulating case. Covered positive temperature coefficient thermistor device.