JPS6223036Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating element that heats a fluid, such as air, that passes between a number of plate-shaped positive temperature coefficient thermistors arranged in parallel.

Conventionally, as a heating element of this type, a heating element called a harmonica type heater is shown, the overall perspective view of which is shown in FIG. 1, and the structure of which is shown in FIG. 2.

In FIGS. 1 and 2 above, 1,...,1
is a positive temperature coefficient thermistor formed into a rectangular plate shape,
2, 2 is a terminal board having rectangular ventilation holes 2a, 2a, and between these ventilation holes 2a, 2a are provided bars 3, 3 of a constant width; The positive temperature coefficient thermistors 1, . . . , 1 are insulating spacers that are fixed facing each other at the terminal boards 2, 2 with an adhesive 5, . , 2a at equal intervals in a direction perpendicular to the long side direction, and each electrode 1 of the positive temperature coefficient thermistor 1, .
a, 1b, .

By the way, when the heating element has the above configuration, the electrodes 1a, 1 of the positive temperature coefficient thermistors 1,..., 1
b,...1a, 1b are made of silver, and the electrodes 1a, 1b,..., 1a, 1b are electrically conductive to the crosspieces 3, 3 using a conductive adhesive such as silver paste 6, 6 to improve strength. The cost is high. Since the positive temperature coefficient thermistors 1,..., 1 are fixed to the terminal plates 2, 2 by the adhesives 5,..., 5, the mechanical strength is low and they are susceptible to distortion due to thermal expansion. Adhesive 5 ,..., 5 etc. take time to harden and bake, heating element cannot be disassembled or parts replaced, bent part 2b of terminal board 2, 2 to improve strength,...
2b, there were various drawbacks, such as the spatial distance between the terminal plates 2 and 2 being shortened, resulting in poor pressure resistance.

The present invention was developed to eliminate the above-mentioned drawbacks of heating elements using positive temperature coefficient thermistors, and is inexpensive and easy to manufacture by using a frame and a comb-shaped spring terminal with a spring member. The purpose is to provide a heat generating element.

For this reason, the present invention provides a pair of frames in which an opening for fluid circulation is formed inside when assembled, and a rectangular plate-shaped positive temperature coefficient thermistor is mounted on the inner surface of the side member opposite the opening of each frame. A series of locking portions are provided at a predetermined pitch in the longitudinal direction of the opposing side member, each of which is perpendicular to each of the locking portions. A pair of comb-like spring terminals each having a plurality of spring pieces are provided on both sides of a supporting member having a constant width, and the spring pieces of the comb-like spring terminals and the supporting member are respectively arranged so as to face each other. The positive temperature coefficient thermistor is fitted into the locking portion and the fitting groove provided on the inner surface of the side member, and both ends of the positive temperature coefficient thermistor are fitted into the locking portion provided on the frame, and an opening for fluid circulation is formed inside. By combining the pair of frames such that It is characterized by being sandwiched between spring pieces.

Embodiments of the present invention will be described below with reference to drawings showing embodiments of the present invention.

In FIG. 3, 11, . . . , 11 are positive temperature coefficient thermistors similar to those in FIG.
12, 12 are these positive characteristic thermistors 11,...,
The frame holding 11, 13, 13 are comb-like spring terminals for supplying power to the positive temperature coefficient thermistors 11, . . . 11.

The frames 12, 12 are both made of a heat-resistant resin having insulating properties, and as shown in FIG. By assembling these two frames 12, 12, the long side member 1
5 and 15 as a pair of opposing side members, and a short side member 16
And 17, 17 are a pair of opposing side members, and the above resin is formed so that a rectangular ventilation opening 14 is formed inside.

Short side members 16, 17, 17 of the long side member 15
On the inner wall surface of the protruding side, a positive temperature coefficient thermistor 11,
..., 11 are inserted into the locking portions 18, ..., 18, which prevent the ends of the openings 14 from being removed in the direction perpendicular to the opening end surface (ventilation direction), in the longitudinal direction of the long sides 15. They are provided in a series at a predetermined pitch and are perpendicular to the locking portions 18, . . . , 18, respectively.
A fitting groove 19 is provided for fitting the support member 13a of the comb-like spring terminal 13.

Short side member 16 of frame 12 and short side member 1
7 and 17 are fitted inside and outside the short side members 17, 17 and short side member 16 of another frame 12, respectively.

On the other hand, the comb-shaped spring terminal 13 is made by punching out a metal plate having spring properties such as brass, and
Locking portions 18, .
Spring pieces 13b, . . . , 13b curved in an arc shape are made to protrude in a comb-teeth shape with a pitch equal to the pitch of 18, and a tab-on connection terminal 13c is provided at one end of the support member 13a.

The tab-on connection terminal 13c is connected to the frame 12.
has a width that can be fitted between the short side members 17, 17,
A positioning hole 21 is provided at the base thereof, into which a positioning projection 20 provided on the inner wall surface of the long side member 15 between the short side members 17, 17 is fitted.

The comb-shaped spring terminal 13 has its support member 13a and spring pieces 13b, .
and the locking portions 18, . . . , 18 to connect the tab-on connection terminal 13c to the short side member 1
7 and 17, and the positioning protrusion 20 is inserted into the positioning hole 21 thereof. Short side members 17, 17 and short side member 16 of the frame 12
4, the short side member 16 and the short side members 17, 17 of another frame 12 into which the comb-teeth spring terminal 13 has been fitted are shown in FIG.
Insert as shown. At that time, frame 1
Both ends of the positive temperature coefficient thermistors 11, ..., 11 are fitted into the locking portions 18, ..., 18 of the second frame 12 and the locking portions 18, ..., 18 of the other frame 12, respectively. 22, 22 to eyelet hole 2
3 and 23 to fix the two frames 12 and 12 to each other as shown in FIG.

If the heating element has the above configuration, the positive temperature coefficient thermistors 11, . . . , 11 are connected to the locking portions 18, .
..., 18, and the spring pieces 13b, ...13b of the comb-like spring terminal 13 are positioned by the frame 12,
Electrodes 11a,..., 1 of the positive temperature coefficient thermistors 11,..., 11 formed on the surface facing the long side member 15 of 12
1a, while the spring pieces 13b, . . . , 13b of another comb-shaped spring terminal 13
Electrodes 11b,..., opposite to a,..., 11a, respectively
11b, the two frames 12,
It is held between 12 and 12.

Therefore, by applying a voltage between the tab-on connection terminals 13c, 13c of the comb-like spring terminals 13, 13, the frames 12,
12, that is, in the direction of arrow B in FIG.
1, . . . , 11, it is heated and the temperature can be increased.

In the above embodiment, reference numerals 24 and 24 are mounting holes for the heat generating elements, and 25 is a hole into which the positioning protrusion 20 provided on the frame 12 is inserted.

In the above embodiment, the positive temperature coefficient thermistor 11 has electrodes 11a and 11b arranged perpendicularly and parallelly to the ventilation direction, as shown in FIGS. 6b and 6c, in addition to the one shown in FIG. 6a. It is also possible to use an extended version. Further, as shown in FIG. 6d, the electrode 11 of FIG.
The electrodes 11a and 11b of FIG. 6b are partially extended to the main surface side of the positive temperature coefficient thermistor 11, respectively, as shown in FIG.
11b in a comb-shaped or spiral shape on the main surface of the positive temperature coefficient thermistor 11, as shown in FIG. 6g, and in FIG.
It is also possible to use a positive temperature coefficient thermistor 11 (a, 11b) in which the extensions to both main surfaces are formed in a comb-teeth shape.

In the above explanation, the basic embodiment of the present invention has been described, but for example, the comb-shaped spring terminal 13
Although not specifically shown, the spring pieces 13b are curved in a circular or U shape instead of being curved in an arc shape.
It is also possible to use a curved shape.

As is clear from the detailed description above, the present invention has a comb-like shape in the frame that has locking parts that lock both ends of the PTC thermistor and prevent it from coming off in the direction of fluid flow. Since the positive temperature coefficient thermistor is held by the spring force of the spring terminal, it is easy to assemble since no adhesive is required, and an inexpensive heat generating device is obtained since no expensive metals such as silver paste are used. Since no adhesive is used, PTC thermistors can be used with high Curie temperatures, and a heat generating device with a large amount of heat can be manufactured.PTC thermistors can be held together by spring force. This makes the heat generating device more resistant to damage due to thermal strain and mechanical stress.The positive temperature coefficient thermistor is housed in multiple stages within the frame case to reduce the distance between the electrodes of the positive temperature coefficient thermistor. For example, various effects such as improved heat generation efficiency can be achieved.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional heating element, and Figure 2 is a perspective view of a conventional heating element.
3 is a plan view of the heating element according to the present invention, FIG. 4 is an exploded perspective view of FIG. 3, FIG. 5 is a cross-sectional view taken along the line -' of FIG. 3 to 5 are perspective views of positive temperature coefficient thermistors used in the heating element of FIG. 3, respectively. 11... Positive characteristic thermistor, 12... Frame, 13... Comb tooth shaped spring terminal (13a... Support member, 13b... Spring piece, 13c... Tab-on connection terminal), 14... Ventilation port, 18... Locking part.

Claims (1)

[Scope of utility model registration request] A pair of frames each having an opening for fluid circulation formed inside thereof when assembled is provided, and both ends of a square plate-shaped positive temperature coefficient thermistor are locked to the inner surface of the side member opposite the opening of each frame. Locking portions for preventing removal in a direction perpendicular to the opening end face of the opening are provided in a series at a predetermined pitch in the longitudinal direction of the opposing side member, and fitting grooves are provided perpendicularly to each of the locking portions. On the other hand, a pair of comb-like spring terminals each having a large number of spring pieces are provided on both sides of a support member having a constant width, and the spring pieces of the comb-like spring terminals and the support member are respectively provided on the inner surface of the opposing side member. The PTC thermistor is fitted into the locking portion and the fitting groove provided in the frame, and both ends of the PTC thermistor are fitted into the locking portion provided on the frame, so that an opening for fluid circulation is formed inside. By combining a pair of frames, a number of positive temperature coefficient thermistors are sandwiched between the spring pieces of the comb-shaped spring terminal with the spring pieces being pressed into contact with the electrodes provided at both ends of the positive temperature coefficient thermistor. A heating element characterized by: