JPS581988A - Heater utilizing ptc element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating device using an element exhibiting positive temperature characteristics (PTC element), and particularly to a heating device using a fan whose main components are a crystalline resin and conductive particles. 6 The present invention is-
For example, low-temperature starting of an internal combustion engine, which is suitable for use as an intake air heating device for an internal combustion engine, is carried out to heat the air to improve fuel O atomization and improve driveability. As a means for this purpose, a device using a 9-heating element has recently been developed.The PTC heating element has a cylindrical shape with intake air flowing through its center hole, and the air temperature is 1k lower. The reason is that the PTC heat sink has a low electrical resistance value, and the amount of electricity it conducts is very hot < 1k).The amount of heat generated is large, so intake air heating is performed. Conventionally, ceramic y/type (for example, the main component is 1adles) has been used as an RFC heating element, but since the material is brittle, special O
Requires some ingenuity.For example, a cylindrical element can be attached to a metal electrode cylinder, and this electrode cylinder can be fastened to the flange part between the carburetor and the intake manifold. ing. However, the conventional structure exhibits various drawbacks as follows. That is, (1) Cylindrical FTCI! In order to insert the electrode into the electrode tube, the outer circumferential surface must be finished with high precision.

(2) Moreover, since the outer electrode cylinder acts as a heat radiation cylinder, the efficiency of the mixture and the mixture is poor.

(3) Round PTC where heat is conducted through the electrode tube
Heat conduction between the element and the electrode is poor, and heater efficiency is poor.

(4) It is difficult to fix the cylindrical PrC element, and it is especially vulnerable to vibrations in the vertical direction.

(5) The thermal expansion coefficients of the electrode tube and the p'rc element are different,
It is undesirable to round the PrC element to ensure sufficient electrical contact, but at high temperatures the PrC element has a structure in which it is subjected to force inward.

The purpose of the present invention is to create a structure in which the K PrC element can be directly attached to its support without using an electrode tube, and to improve the strength and installation ease of the heating device using the PrC element. At the same time, the purpose is to improve the efficiency of the electric heating device.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. l
In IA, nine embodiments are shown in which the present @O heating device is used as an intake air heating device for an internal combustion engine.

The heating device of the present invention is composed of a combination of a cylindrical heating element assembly 1G and a support, that is, a heat insulator 2o, that supports the heating element arrangement. A cylindrical heating element assembly 1 is located downstream of the throttle valve (not shown) of the carburetor (slow system at 41), and supplies the O mixture from the throttle valve to the intake marholt (not shown). I fulfill the role of guiding and at the same time pass through it.
Heating the IK mixture.

To construct the heating element assembly lo used in this invention, first, a P″rC heating element 11, which is mainly composed of crystalline resin and conductive particles and exhibits a positive temperature coefficient, is formed into a cylindrical shape.
Such a 1°C heating element is made by, for example, melting a crystalline resin, adding curd dyf 9 -tsuk particles into it, dispersing it in a pot, and kneading it. It can be made into a cylindrical shape by blending a glass fiber-coated thermosetting ester resin therein, placing this blend in a mold, and heat-molding it.

This cylindrical PcT heating element 11 is integrally formed with a flange 12 projecting outward from the outer circumference of its axial end (upper end). This 7-piece 12 may be made of the same material as the heating element 11 and integrally molded, or it may be made of a non-heat-generating resin material and attached to the heating element 1 by pressure welding or adhesive.
1 may be integrally joined.

In the embodiment shown in FIG. 1, the cylindrical P'rC heating element 11 has a comparatively wide flange 12 on one side of the end 0. The heating element 11 has a length of 0 on the inner and outer cylinder surfaces. Electroplated layers 13m and 513k are formed respectively. The electroplated layer 33m on the inner cylindrical surface extends from about half of the upper surface of the 7 flange 12 to beyond the end surface in 7 runs/1. ．． -7F, the electrode plating layer 13b on the outer cylinder surface extends from about half the area of the bottom surface of the 7 flange 12 (see FIG. 1 0)) (see Figure 1), these electrode layers 13m and 13 are connected to each other so that they do not touch each other. 1. Moreover, they are formed so as to be separated from each other by at least a certain distance (usually the thickness of the heating element 11).

In the following days, the heat insulator 20 will be assembled into the heat insulator 20, which is a support for the heating element 11J10t.The heat insulator 20 will have a hole 21 for receiving the cylindrical part of the heating element A and the assembly 100, and a flange part 12 for receiving the heat insulator 20. A recess 22 is provided in which the heating element assembly 101i is inserted.
Electrode plates 23m and 23b are arranged side by side, respectively, in contact with the electrode plated layers 13ae13b on the lower surface of the electrode plates 23m and 23b, respectively.

These electrode plates 23m and 23bK are connected to +7-P wires 24m and 24b, respectively. Therefore, the electrode plate 23
m, 23k and the heating element assembly 101 heat insulator, to attach it to the heater 20, first lead! 24m,
241* with a small hole of 25 m.

25k to the outside of the ink generator 20, and the electrode plates 23m and 23b are placed at predetermined positions in the recess 22.
Screw 26, washer 27: Just tighten these to insulator 2 OK with nut 280 Heating element a, Franz part 12 of assembly 10, Electrode plate 23 a a 23
bs and the recess 22 of the heat insulator 200 are provided with holes for tightening screws. It is convenient to insert the nut 28 into the recess 22 of the heat insulator 20t.
At the same time that the pre-IO is incorporated into the heat insulator 20, the electrode plates 23m, 23b and the electrode plating layer 13&.

After the 6 heating element a and assembly 100 are assembled, the 13b connection is made and the PTC heating element 11 can be energized.
The heating device of the present invention is attached to a carburetor (not shown) and an intake manifold (not shown) of an internal combustion engine with a slot on both sides.

If such a heating device of the present invention is used as an intake air heating device for an internal combustion engine, when the intake air temperature is low such as during a cold start, a large current flows and heat is generated because the electrical resistance value of the PTC element 11 is small. , heating of the intake air passing through the air takes place. If the intake temperature becomes high enough, the PTC element 11 will be charged! Since the resistance value is large, the current virtually stops flowing, so heat generation is stopped.The embodiment shown in Fig. 2 is basically the same as the embodiment shown in Fig. , both electrode plates 23 a
Elastic pin 30a for each #23b.

31a: 30b, 31b are provided, and an elastic pin 30 is inserted therein.
m, 30b is the depression 32m of the heat insulator 20,
3jb (32a#i not visible in the figure), the electrode plates 23m and 23b are held by the heat insulator 20, and the elastic pin 31a is bent.

31b is a heating element assembly 1oo14 and 33a.

33b (33b is not visible in the figure) K, and the heating element assembly 1G is held by the electrode plates 23m and 23b. With such a structure, screw fastening work can be further simplified. That is, the electrode plates 23m, 23
bt-attached heating element a, installation of the assembly 10 is simplified. In addition, in this example, the electrode plate 23m,
Hole 341L*34b of 23b is a screw hole, and washer 2
7, )28t-can also be omitted.

The embodiment shown in FIGS. 3 and 4 has flanges of 12 m and 1
2b are provided on both sides of the cylindrical heating element 11 in the diametrical direction, and the electrodes on the inner cylindrical surface of the element, -? The layer taa is placed on the upper and lower surfaces of the flange lZa, and the IP layer 13b is placed on the electrode layer on the outer cylinder surface of the element.
The six flanges 12a and 12bK that extend into the upper and lower surfaces of the runno 12 are provided with screw holes 35m and 35b, respectively, and the screws 26 [and the electrode plate 23m'*
23k' are fastened to the flannel parts 12m and 12b, respectively. In order to prevent the head of the screw 260 from protruding upward from the upper surface of the cylindrical heating element 11, the flange portion 12 m,
12b is drawn in from the top surface of the element 11. Other structures and operations are similar to those of the previous embodiment.

The embodiment shown in FIGS. 5 and 6 has an electrode plate 23a.

23bt-furan/12m, by passing the screw 26 for fixing to the heat insulator 20 through the hole in the heat insulator 20 and fixing it with a washer 40 and a nut 41, the heating element assembly lO is held more firmly in the heat insulator 20. Note that the screws 26 can also be molded together when the heat insulator 20 is molded.

As described above, in the configuration of the present invention, the heating element assembly lO is formed as a cylinder with a flantz, so that it can be attached to the intake pipe in an ITT class. Since it is made of 3-based material, it has sufficient strength and will not cause any problems even if it is directly installed.
By using a heating element, the following drawbacks can be overcome.

In addition, it is extremely easy to assemble the heating element assembly lO to the heat insulator (support) 20 and to the carburetor of the internal combustion engine, and the contact surface pressure between the electrode plate and the heating element assembly is reduced. This ensures that the performance of the electric heating device can be improved. (9) When the present invention is used as an intake air heating device for an internal combustion engine, it is convenient in terms of ensuring airtightness in the heating section.

[Brief explanation of drawings]

Fig. 1 is an exploded oblique view of the heating device of the present invention, in which one bale of cocoons is taken. Fig. 1) is a sectional view taken along line A-^ in Fig. , FIG. 2 is an exploded perspective view of another embodiment of the invention similar to FIG. 1, and FIG. 3 is a plan view of yet another embodiment of the invention. Figure 4 is a cross-sectional view at m*-■ in Figure 3, Figure 5 is a plan view of yet another embodiment of the present invention similar to Figure 3, and Figure 6 is a cross-sectional view taken along line ■ in Figure 5. It is a sectional view at −■. 10...Heating element assembly, □11...PTC heating element% 1li2a*12b...7 runno, 13
asl! lk+...electrode plating layer, 20...support body (heat insulator), 23m, 23b...electrode plate. Patent Applicant Toeta Jidosha Kogyo Co., Ltd. Kinsha Matsushita Electric Industrial Co., Ltd. Patent Application Agent Patent Attorneys Akira Aomizu Patent Attorney Kazuyuki Heidate Patent Attorney Higuchi Todomari Patent Attorney Akiyuki Yamaguchi Figure 1 'f 1 (A) + -! Figure 2

Claims (1)

[Claims] 1. A heating element exhibiting a positive temperature coefficient is formed from crystalline resin and conductive particles into a cylindrical shape, and a flange protrudes outward from the axial end Q of the armpit-shaped heating element. a heating element assembly, wherein the electrode layers formed on the cylindrical surface and the outer cylindrical surface of the cylindrical heating element are extended to at least one surface in the axial direction of the seven flanges so as not to contact each other; a support having electrode plates that respectively contact the electrode layers on the flange surface when supporting the heating element assembly; and means for fastening to the support.