JP3416238B2 - Positive characteristic thermistor device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive temperature coefficient thermistor device used for starting a compressor, and more particularly to an improvement of a spring contact holding a thermistor element. 2. Description of the Related Art Conventionally, in a compressor motor having a main winding and an auxiliary winding, a positive characteristic thermistor element is connected in series to the auxiliary winding, and a large current is temporarily supplied to the auxiliary winding when starting. To increase the starting torque of the electric motor. [0003] Such a positive characteristic thermistor device is disclosed in Japanese Utility Model Publication No. 58-34722.
As shown in FIGS. 12 to 15, a case 30 made of an insulating material such as an unsaturated polyester resin and a case 30 attached to the case 30 so as to pass through the inside and outside of the case 30.
External connection terminals 31 and 32 and the external connection terminals 3
Spring terminals 33 and 34 attached to the first and second terminals 32 and disposed in the case 30 so as to face each other, and a cylindrical positive temperature coefficient thermistor element 6 elastically held between the two spring terminals 33 and 34. Consists of The spring terminals 33 and 34 are connected to bases 36 and 37 fixed to the connection terminals 31 and 32, respectively.
The four tongue pieces 38, 39 bent in a C-shape so as to face each other are integrally formed of a stainless steel plate material. [0005] Here, in the positive temperature coefficient thermistor device having the above-described structure, when inserting the positive temperature coefficient thermistor element, two sets of spring terminals are opened, and the C-shaped tongue is opened. The positive terminal thermistor element is held between the pieces by utilizing the force of the spring terminal returning to the original position. In that case, the insertion of the PTC thermistor element into the spring terminal is incorrect,
If a force is applied more than a certain amount due to the loose insertion, the tongue of the spring terminal will not return to its original state while being deformed, and the PTC thermistor element will not be able to be held. The present invention has been made to solve such a problem, and an object of the present invention is to provide a positive temperature coefficient thermistor device having a spring terminal which is not deformed even when a predetermined force or more is applied. It is assumed that. SUMMARY OF THE INVENTION The present invention provides a case made of an insulating material, two external connection terminals mounted on the case so as to penetrate the inside and outside of the case, and this external connection terminal. And a positive-characteristic thermistor device comprising a positive-characteristic thermistor element resiliently held between the two spring terminals, the spring terminals being provided in the case. And a base which is formed in a semicircular arc shape facing each other from the base and each end of which is inserted into the through hole.
The positive temperature coefficient thermistor element
And a curved spring for holding the
Compression by inserting a conductive thermistor element between spring terminals
When bending in the direction, the movement in the compression direction
The restricting projection that locks to the edge to regulate is free of the curved spring.
It is provided at the end. The two external connection terminals are provided with a curved spring portion for holding the PTC thermistor element, and the PTC thermistor element is mounted by pushing open the curved spring section. When a certain force or more is applied to the curved spring portion at the time of mounting, the free end of the curved spring portion is inserted into the through hole, and furthermore, the free end of the curved spring portion is deformed by the regulating protrusion formed at the free end. I try to prevent it. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a PTC thermistor device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a case including an upper case 1a and a lower case 1b formed of an insulating material such as an unsaturated polyester resin. Reference numerals 2 and 3 denote two external connection terminals which are detachably mounted on the case 1 so as to penetrate through the inside and outside of the case 1. One end of each of the external connection terminals 2 and 3 is used for connection to an external electric circuit. Tab terminals 2a, 3a are formed at the other end, and receptacles 2b, 3b for connection to terminals of the compressor are formed at the other end, and projecting pieces 2c, 3c for attaching spring terminals described later are integrally formed at the center. Reference numerals 4 and 5 denote protrusions 2c of external connection terminals 2 and 3,
These are spring terminals made of stainless steel which are spot-welded to 3c and are arranged so as to face each other in the case 1.
Since the spring terminals 4 and 5 have the same structure, one spring terminal 4 will be described with reference to FIGS. The spring terminal 4 has a base 4a fixed to the external connection terminal 2, and a pair of through holes 7, 7, 8, 8 are formed in the base 4a so as to face each other. Then, curved spring portions 13 and 14 are formed from a pair of band-shaped members 11 and 12 which are formed to be bent in a semicircular shape facing each other from the upper and lower ends of the base portion 4a.
Then, a positive temperature coefficient thermistor element 15 described later is elastically held. Further, the two strip-shaped members 11 and 12 are connected to each other by bridging portions 16 and 17 to obtain strength. Then, the free ends 13a, 14a of the curved spring portions 13, 14 are previously inserted into the through holes 7, 7, 8, 8 of the base 4a as shown in FIG. A positive temperature coefficient thermistor element 15 is disposed at a central portion in the case 1, and upper and lower ends thereof are held by supporting projections 18, 18 provided facing the case 1. Incidentally, in the spring terminal 4, the curved spring portions 13, 14 are provided.
Are formed in the vicinity of the free ends 13a, 14a so as to protrude outward, respectively, so that the free ends 13a, 14a do not come out of the through holes 7, 7, 8, 8 beyond a certain limit. Regulating projection 2 that regulates against the edge of
1 and 22 are formed integrally. Similarly, as shown in FIGS. 1 and 4, the other spring terminals 5 have curved spring portions 23 and 24 and their free ends 23.
regulating projections 21a, 22a provided near the a, 24a;
The free ends 23a, 24a of the curved spring portions 23, 24 enter,
Further, the control projections 21a, 22a have through holes 7a, 7a, 8a, 8a hooked to the edges. As described above, in the present invention, for example, the spring terminals 4 and 5 have four through holes provided with the free ends 13a, 14a, 23a and 24a of the curved spring portions 13, 14, 23 and 24 in the bases 4a and 5a. 7, 7, 8, 8, 7a, 7a, 8
a, 8a in a state where they are slightly inserted in advance.
In this state, no force is applied since the positive-characteristic thermistor element 15 is not sandwiched therebetween, and as shown in FIG.
1, 22, 21a and 22a are through holes 7, 7, 8, 8, 7
a, 7a, 8a, 8a. On the other hand, the spring terminal 4, which is in such a state,
5, the force F is applied to the spring terminals 4 and 5, and the curved spring portions 13, 14, 23,
24 is pushed and its free ends 13a, 14a, 23a, 2
4a is a through hole 7, 7, 8, 8, 7a, 7a, 8a, 8a
From the curved spring portions 13, 14, and 2 facing each other.
The positive temperature coefficient thermistor element 15 is inserted between the portions 3 and 24 so as to be sandwiched by its restoration elasticity. When a large force is applied to the curved spring portions 13, 14, 23, 24 when inserting the positive characteristic thermistor element 15, the regulating protrusions 21, 22, 21a, 22a
Are hooked on the edges of the through holes 7, 7, 8, 8, 7a, 7a, 8a, 8a to form free ends 13a, 14a, 23a, 24.
a does not escape any more. For this reason, it is surely prevented from being deformed to such an extent that the resilient elasticity of the curved spring portions 13, 14, 23, 24 is lost. Thus, when the positive temperature coefficient thermistor element 15 is mounted, the positive temperature coefficient thermistor element 15 can be mounted without taking care not to deform the curved spring portions 13, 14, 23, 24, so that the mounting is easy. Can be done. As described above, according to the present invention, the spring terminal for holding the positive temperature coefficient thermistor element is constituted by a base having a through hole and curved springs provided at both ends of the base.
When the positive temperature coefficient thermistor element is inserted between the spring terminals, the free end of the positive temperature coefficient thermistor element can be slightly protruded from the through hole to hold the positive temperature coefficient thermistor element. Then, when a force at the time of insertion is applied to a certain degree or more, the restricting projection provided at the free end is caught in the through hole to surely prevent such deformation that the spring terminal loses the restoring force. This makes it possible to easily attach the positive temperature coefficient thermistor element and extend the life of the spring terminal.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional front view of a positive temperature coefficient thermistor device according to one embodiment of the present invention. FIG. 2 is a front view of an external connection terminal of the positive temperature coefficient thermistor device. FIG. 3 is a side view of an external connection terminal showing a state before the PTC thermistor element is attached. FIG. 4 is a side view of an external connection terminal showing a state where the positive temperature coefficient thermistor element is attached. [Description of Signs] 1 Cases 2, 3 External connection terminals 4, 5 Spring terminals 7, 8, 7a, 8a Through holes 13, 14, 23, 24 Curved spring portions 13a, 14a, 23a, 24a Free end 15 Positive characteristic thermistor element 21, 22, 21a, 22a Control projection

Claims (1)

(57) [Claims] 1. A case made of an insulating material, two external connection terminals attached to the case so as to penetrate inside and outside of the case, and attached to the external connection terminal. In the positive temperature coefficient thermistor device comprising a spring terminal disposed so as to face each other in the case and a positive temperature coefficient thermistor element elastically held between the two spring terminals, the spring terminal faces a through hole. and a base are formed, enters into and is formed bent in a semicircular arc opposite each other from the base that each tip the loopholes, opposite
Bending that holds the PTC thermistor element at the fitting bend
A spring, wherein the curved spring is the positive temperature coefficient thermistor element.
When bending in the direction of compression by inserting the child between the spring terminals
And the movement in the compression direction is locked to the edge of the through hole.
A regulating protrusion for regulating is not provided at the free end of the curved spring.
Positive temperature coefficient thermistor device, characterized in that that.