JP2511346Y2 - Positive characteristic thermistor device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a positive temperature coefficient thermistor device applied to a warm air heater, a waterproof heater or the like.

2. Description of the Related Art Conventionally, as a positive temperature coefficient thermistor device applied to a warm air heater, the one shown in FIG. 8 has been provided by the applicant of the present invention. This PTC thermistor device has a metal case
The element body 50 of the positive temperature coefficient thermistor and the metal terminal 51 are housed in 40. The metal case 40 includes a storage container 41 and a lid 47. The storage container 41 is partitioned by a partition wall 41a, and a spring receiver 41b is provided on the upper portion of the wall 41a. The lid 47 is provided with locking portions 47a on both left and right sides, and the tip of the locking portion 47a wraps around the spring receiver 41b. 50 in the storage container 41,
A metal terminal 51, a resin spacer 52, and an insulating sheet 53 for insulating between the metal terminal 51 and the metal case 40 are housed on the upper and lower surfaces thereof. A spring 54 is press-fitted into a gap formed between the spring receiver 41b and the tip of the locking portion 47a, and the spring force of the spring 54 causes the storage container 41, the lid 47, and the element body 50.
The metal terminal 51 and the insulating sheet 53 are pressed against each other. Prime field
The heat generated in 50 is transferred to the case 40 via the metal terminal 51 and the insulating sheet 53. A large number of heat radiation fins 45 are provided on the outer side of the case 40 at regular intervals, so that the heat transferred to the case 40 can be efficiently taken out.

However, in the positive temperature coefficient thermistor device having this structure, it took a long time to process the metal case 40, particularly to process the partition wall 41a, the spring receiver 41b and the locking portion 47a. Moreover,
Due to the complicated structure, the machining accuracy is relatively poor and the spring 54
The pressing force of the element varies, and as a result, there are problems such as poor contact between the element body 50 and the metal terminal 51, or inefficient transfer of heat generated by the element body 50 to the metal case 40. It was

Therefore, an object of the present invention is to provide an inexpensive positive temperature coefficient thermistor device that efficiently and stably dissipates heat generated in the element body.

Means for Solving the Problems In order to solve the above problems, a positive temperature coefficient thermistor device according to the present invention is configured such that a positive temperature coefficient thermistor element body is pressed against a surface of the element body through a metal terminal and an insulating sheet. First and second metal plates, and a spring member press-fitted between the first and second metal plates. At least one tongue portion is provided on each side edge of the first metal plate, and a second spring member is provided on the spring member. At least one tongue portion is provided at a position different from the position of the tongue portion provided on the first metal plate on both side edge portions of the second metal plate, so as to wrap around so as to come into pressure contact with the metal plate side, The first and second metal plates, the element body, the metal terminal, and the insulating sheet are provided around the spring member so as to come into pressure contact with the first metal plate side, and the spring force of the spring member acts on the tongue portion. Are held in pressure contact with each other.

In the above-described structure, the tongue portion of the spring member that receives the spring force is easily and accurately formed by press working. The spring member firmly holds the first metal plate and the second metal plate, and makes the first and second metal plates, the element body of the positive temperature coefficient thermistor, the metal terminal, and the insulating sheet contact each other with a constant pressing force.

Embodiment An embodiment of the positive temperature coefficient thermistor according to the present invention will be described below with reference to the accompanying drawings. The same reference numerals are given to the same parts and portions in each embodiment and each drawing.

[First Embodiment, FIGS. 1 to 4] The positive temperature coefficient thermistor device of the present embodiment includes two metal plates 1.
A positive temperature coefficient thermistor element body 5, a metal terminal 6, an insulating sheet 8 and the like are sandwiched between the three. Rectangular metal plates 1 and 3 are used, and two tongue portions 2 and 4 are formed on the long side edges on both sides. The tongue portions 2 and 4 are provided at different positions so that they are arranged at different positions when the metal plates 1 and 3 are combined. The metal plates 1 and 3 having the same shape are accurately manufactured by, for example, press working, and the tongue
Used in combination so that 2 and 4 are inside. Tongue 2,4
Are paired, and a spring 10, which will be described later, is press-fitted between them.

The element body 5 has a rectangular plate-like structure and is made of a ceramic material such as BaTiO ₃ . Usually, a plurality of element bodies 5 are arranged in a column in the long side direction in the central part of the metal plates 1 and 3, and each element body 5 is positioned by a spacer 7 made of resin.
If a resin having excellent thermal conductivity is used for the material of the spacer 7, the heat generated in the element body 5 can be efficiently transmitted to the metal plates 1 and 3. Metal terminals 6, 6 are in contact with the top and bottom of the element body 5. Insulating sheets 8 are sandwiched between the metal terminals 6 and 6 and the metal plates 1 and 3 to insulate them.

The spring 10 is a long and thin circular tube, and a part of the side surface is axially cut out. The diameter of the spring 10 is larger than the dimension D of the gap formed by the surface including the upper surface of the tip of the tongue 4 and the surface including the lower surface of the tip of the tongue 2 (see FIG. 2).

Next, a method of assembling the PTC thermistor device having the above configuration will be described.

First, an insulating sheet 8, a spacer 7 having a metal terminal 6 attached thereto, a plurality of element bodies 5, a metal terminal 6, and an insulating sheet 8 are stacked in this order on the central portion of the upper surface of the metal plate 1 using the tongue 2 as a guide. From the metal plate 1 thus prepared to the metal plate 3
Are assembled so that the tongue portion 4 and the tongue portion 2 form a pair. The springs 10 and 10 are press-fitted from one end of the metal plates 1 and 3 in the long side direction into the gap formed by the surface including the lower surface of the tip of the tongue 2 and the surface including the upper surface of the tip of the tongue 4. At this time, the spring 10 is arranged so that the cutout portion faces inward. Due to its elastic force, the spring 10 presses against the tongues 2 and 4 to firmly hold the metal plates 1 and 3, and also keeps the metal plates 1 and 3, the element body 5, the metal terminal 6 and the insulating sheet 8 constant. Contact with pressing force.

The positive temperature coefficient thermistor device thus obtained does not require a long time for processing because the metal plates 1 and 3 have a simple structure, and the tongue is accurately manufactured by prefabrication, etc. The pressing force of the spring 10 does not fluctuate, and contact failure between the element body 5 and the metal terminal 6 does not occur. Therefore, the heat generated in the element body 5 can be stably extracted.

[Second Embodiment, FIG. 5] The positive temperature coefficient thermistor device shown in FIG. 5 has a large number of heat radiation fins 15 provided at regular intervals on the outer surface of the metal plates 1, 3 of the first embodiment. . Thereby, the body 5 of the insulating sheet
It is possible to take out the heat generated from the outside more efficiently than that of the first embodiment.

[Third Embodiment, FIG. 6] Metal plates 1 ′ and 3 ′ shown in FIG. 6 are the metal plates of the first embodiment.
The tongues 2 and 4 are provided on the edges 1 and 3 in the direction of the short side, and the metal plates are used for the waterproof type positive temperature coefficient thermistor device.

[Other Embodiments] The positive temperature coefficient thermistor device according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the invention.

The body of the positive temperature coefficient thermistor is disc-shaped according to its purpose,
Those modified into various shapes such as a cylindrical shape are used. In this case, the metal plate is also deformed according to each element body.

Further, the shape of the tongue portion may be tongue portions 2'and 4'having curled tip portions as shown in FIG. Tongue 2 ', 4'
Can contact the spring 10 in a large area, and the pressing force of the spring 10 can be made more stable.

As described above, according to the present invention, since the press-fitted spring member is pressed against the tongue portions provided on the first and second metal plates, the spring member accurately formed by press working is the first metal. While firmly holding the plate and the second metal plate, the first and second metal plates, the element body of the positive temperature coefficient thermistor, the metal terminal and the insulating sheet are in contact with each other with a constant pressing force, so that the pressing force is reduced as in the conventional case. There is no variation, and heat can be taken out from the element body in a stable manner.

Further, since the first and second metal plates have a simple structure, it does not take a long time to process them, so that the positive temperature coefficient thermistor device can be manufactured at low cost.

[Brief description of drawings]

1 to 4 show a first embodiment of a positive temperature coefficient thermistor device according to the present invention, and FIG. 1 is a front view of the device,
2 is a vertical sectional view taken along the line XX 'in FIG. 1, FIG. 3 is a right side view of the apparatus, and FIG. 4 is a perspective view showing a state in which metal plates are combined. FIG. 5 is a vertical sectional view showing a second embodiment of the positive temperature coefficient thermistor device according to the present invention. FIG. 6 is a perspective view showing a metal plate used in a third embodiment of the positive temperature coefficient thermistor device according to the present invention. FIG. 7 is a perspective view showing another modification of the tongue portion. FIG. 8 is a vertical sectional view showing a conventional positive temperature coefficient thermistor device. 1,1 ′ …… Metal plate, 2,2 ′ …… Tongue, 3,3 ′ …… Metal plate,
4,4 ′ …… Tongue, 5 …… Positive characteristic thermistor element, 6 ……
Metal terminals, 8 ... Insulation sheet, 10 ... Spring.

Claims (1)

(57) [Scope of utility model registration request] 1. An element body of a positive temperature coefficient thermistor, first and second metal plates pressed against the surface of the element body via metal terminals and an insulating sheet, and a spring press-fitted between the first and second metal plates. A member, and at least one tongue portion is provided on both side edges of the first metal plate so as to wrap around the spring member so as to come into pressure contact with the spring member from the side of the second metal plate. At least one tongue portion is provided at a position different from the position of the tongue portion provided on the first metal plate on both side edge portions, and the spring member has a first
It is provided so as to wrap around so as to come into pressure contact with the metal plate side, and the spring force of the spring member acting on the tongue portion causes the first and second
A positive temperature coefficient thermistor device characterized in that a metal plate, an element body, a metal terminal, and an insulating sheet are held in pressure contact with each other.