JPH0534541Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a heat generating device for an electric mosquito repellent.

(Prior technology) There are two types of electric mosquito repellents: one is a pine fumigation type that heats mosquito repellent pine containing insecticidal ingredients on a heating plate, and the other is a pine fumigation type that heats a mosquito repellent containing insecticidal ingredients on a heating plate. There are chemical transpiration types that allow transpiration, and both use an electrically heated heating device to perform fumigation and transpiration, but because the temperature conditions are different between fumigation and transpiration, The heating device used in the former pine fumigation type electric mosquito repellent has a flat plate configuration with a heater in contact with the back side of the heat receiving plate on which the mosquito repellent pine is placed; The heat generating device of the device has a structure in which a suction wick is inserted, a wick insertion hole is provided through the wick and the hole is sized to form a transpiration gap around the wick, and the heating is evenly heated from the periphery of the wick insertion hole. There is.

(Problem to be solved by the invention) As described above, the heating device for the electric mosquito repellent is configured so that the heating temperature conditions differ depending on whether the mosquito repellent is heated and fumigated or the chemical solution is heated and evaporated. , it is necessary to manufacture each separately, which has the disadvantage of poor economic efficiency.

In addition, when heating and fumigating a mosquito repellent by placing it on a flat heating device, the center of the heating device is higher than the periphery, so the central portion of the mosquito repellent is intensively fumigated. Average and effective fumigation cannot be expected, and if the chemical liquid sucked up with the wick is evaporated by heating from the surrounding area, the evaporative chemical liquid may condense on the upper surface of the periphery of the wick insertion hole and may not evaporate. As a result, there was a drawback that the loss of evaporative chemical solution was increased.

In order to eliminate such drawbacks, a ring-shaped or plurality of ring-shaped mats that can conduct electricity between insulating members are installed on the back side of the heat receiving plate that forms the mat mounting plane on which the mosquito repellent mats that are fumigated by electric heating are placed. A heating assembly sandwiching positive temperature coefficient thermistors is fixed, and a hole for inserting the wick is formed in the center of each of the wicks, which is large enough to form a gap for evaporation around the wick for sucking up the chemical solution. We developed a heating device for an electric mosquito repellent and attempted to use it for both the pine fumigation type and the chemical vaporization type.
The problem was that the cost was high.

(Purpose of the invention) The present invention provides an inexpensive heating device for an electric mosquito repellent that can be used as a heating device for a fumigation type electric mosquito repellent or as a heating device for a transpiration type electric mosquito repellent without any problems under any temperature conditions. It is intended to.

(Means for Solving the Problems) In order to achieve the above object, the heating device for an electric mosquito repellent of the present invention is provided with a heat receiving plate having a mat mounting plane on which a mosquito repellent mat to be fumigated by electric heating is placed. A positive temperature coefficient thermistor, which is enabled to conduct electricity between the thermally conductive and insulating members, is placed on the back side of the unit adjacent to the hole for inserting the core shown below to fix the heat generating assembly. It is characterized by having a core insertion hole of a size that forms a transpiration gap around the lifting core.

(Example) Next, an example of the heating device for an electric mosquito repellent according to the present invention will be described below based on the drawings.

FIG. 1 is an exploded perspective view of a heating device for an electric mosquito repellent according to a preferred embodiment of the present invention, and FIG. 2 is a cross-sectional view for explaining the assembled state and usage state.

In the figure, reference numeral 1 denotes a stainless steel heat receiving plate, which forms a mat mounting plane 11 on which a rectangular mosquito repellent mat to be fumigated by electric heating is placed.
Further, a holding frame 14 with a holding claw 13 hanging thereon is bent and formed on a pair of opposing edges of the mat mounting surface 11, and a locking leg 16 with a locking claw 15 punched out and standing up is formed in a bent manner. ing.

Reference numeral 2 is an insulating plate made of alumina porcelain, and has a rectangular portion 21 superimposed on the lower surface of the heat receiving plate 1, a core insertion hole 22 in the center, and a cylindrical wall 23 surrounding the back surface. The apron portion 24 forms a T-shape.

3 is a stainless steel upper plate disposed between the insulating plate 2 and the positive temperature coefficient thermistor 4 described later,
A first connection terminal 32 for energizing is attached to the edge of the spring terminal 31.
It has a vertical structure.

4 is resistance temperature characteristic CP (Curie point)
This is a 180° C. positive characteristic thermistor, which has a thickness of 5 mm and a diameter of 12 mm.

Reference numeral 5 denotes a lower contact plate made of stainless steel laid on the lower surface of the PTC thermistor 4, and is connected to a contact terminal 51.
A second connection terminal 52 for energization is vertically provided at the edge.

Reference numeral 6 denotes an insulating box that is brought into contact with the lower surface of the heat receiving plate 1 via the insulating plate 2 and held and fixed by the holding claws 13, and is made of an insulating material made of alumina porcelain and is made of an insulating material that is substantially the same as the insulating plate 2. It has a T-shape, and a housing recess 62 for accommodating the PTC thermistor 4 is formed in the center of the rectangular platform 61, and a shallow groove 63 for the upper contact plate and a deep groove 64 for the lower contact plate are carved. At the bottom of the shallow groove 63 for the upper contact plate and the deep groove 64 for the lower contact plate, there are a through hole 65 for the first connection terminal 32 of the upper contact plate 3 and a through hole 65 for the second connection terminal 52 of the lower contact plate 5. A through hole 66 is provided, and a stepped hole 68 for inserting a core is provided in the center of the apron base portion 67.

Each of the above-described members is sequentially assembled using the insulating box in the disassembled state shown in FIG. 1 as a base material to form the state shown in the sectional view of FIG. 2.

That is, after laying the lower contact plate 5 in the recess formed by the accommodation recess 62 of the insulating box 6 and the deep groove 64 for the lower contact plate, and inserting the second connection terminal 52 into the through hole 66, the lower contact plate 5 is inserted into the accommodation recess 62. The heat generating assembly is constructed by accommodating the characteristic thermistor 4, stacking the upper plate 3, inserting the first connection terminal 32 into the through hole 65, and then stacking the insulating plate 2 on the upper plate 3 to close the insulating box 6. Body H
form. Then, the rectangular portion 21 of the insulating plate 2 of the heat generating assembly H is brought into close contact with the back surface of the heat receiving plate 1, and the holding frame 1 is
4 and held by the holding claws 13 of the heat receiving plate 1 to form a heat generating device.

The heat generating device configured above has a thickness of 5 mm, a diameter of 12 mm, and a resistance temperature characteristic CP (Curie point).
Insert the 180℃ positive temperature coefficient thermistor 4 into the core insertion hole 68.
By accommodating it in the accommodating recess 62 adjacent to,
The surface of the mat mounting plane 11 corresponding to the position where the positive temperature coefficient thermistor 4 is disposed is uniformly distributed and heated through the rectangular portion 21 of the insulating plate 2, and the temperature reaches 140°C ± 10°C.
Therefore, the temperature of the core insertion hole 68 is the same as that of the insulation box 6.
The temperature can be set at 125℃±10℃.

Incidentally, if the heat receiving temperature of the pine is below 130℃, the insecticidal active ingredient impregnated into the pine cannot be fumigated uniformly due to the low temperature, and if it is above 150℃,
The insecticidal active ingredient impregnated into pine cannot be fumigated for a long time because the temperature is high and the fumigation is excessive.
It becomes unsuitable for practical use.

Furthermore, the temperature of the wick insertion hole of the wick for wicking chemical liquid is 115.
If the temperature is below 135°C, the temperature is too low and unsuitable for evaporation of the chemical solution, and if it is above 135°C, the temperature is too high and the chemical solution is evaporated in excess, making it unsuitable for practical use.

In the above embodiment, a positive temperature coefficient thermistor 4 is built into the central back surface of the heat receiving plate 1 in order to use it exclusively as a mat mounting surface, and the chemical liquid sucked up by the chemical liquid suction wick is directed horizontally from the heat receiving plate 1. Although the case has been described in which the core insertion holes 22 and 68 are formed in the apron part 24 that overhangs, the evaporation is not limited to this. , a core insertion hole 22 may be provided on one side of the heat receiving plate 1, and a housing recess for housing the positive temperature coefficient thermistor 4 may be formed on the back side of the heat receiving plate 1 on the other side; alternatively, the heat receiving plate 1 may not be used and an insulating plate 2 or the back surface of the insulating box 6 can also be used as the mat mounting surface.

The heating element H for the electric mosquito repellent assembled in this way is incorporated into an electric mosquito repellent consisting of the electric mosquito repellent main body A and the cover B, as shown by the two-dot chain line in Fig. 2, and when using the mat M is used by placing it on a heat receiving plate, and in the case of chemical liquid evaporation, a chemical liquid container c that is replaceably attached to the electric mosquito repellent.
The upper end of the chemical liquid suction wick b immersed in the wick b is placed in the wick insertion hole for use.

(Operation and Effect of the Invention) The heat generating device for an electric mosquito repellent of the present invention described above has a thermally conductive insulating material on the back surface of the heat receiving plate that forms the mat mounting plane on which the mosquito repellent mat to be fumigated by electric heating is placed. A positive temperature coefficient thermistor, which is enabled to conduct electricity between the two, is placed adjacent to the core insertion hole to fix the heating assembly, and at the same time, a transpiration gap is formed around the inserted core for sucking up the chemical solution. Since the hole for inserting the wick is made through the hole, it is possible to easily balance the temperature conditions and heat distribution between the pine fumigation method, which requires a relatively high temperature, and the chemical evaporation method, which requires a relatively low temperature. To provide a heating device for an electric mosquito repellent, which can secure a uniform temperature distribution, and can be used as a heating device for a fumigation type electric mosquito repellent or as a heating device for a transpiration type electric mosquito repellent. I can do it.

Therefore, it is possible to mass-produce fumigation-type electric mosquito repellents and transpiration-type electric mosquito repellents without distinguishing them as common parts, making it economical and easy to handle. Since a characteristic thermistor is used, compared to conventional products that use a ring shape or a plurality of positive characteristic thermistors, the number of parts is reduced and the product can be provided at a lower cost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a heating device for an electric mosquito repellent according to a preferred embodiment of the present invention, and FIG. 2 is an explanatory view showing a cross-sectional view of the same in an assembled state and a state of use. 1...Heat receiving plate, 2...Insulating plate, 3...Upper plate,
4...Positive characteristic thermistor, 5...Bottom contact plate, 6...
Insulation box, 11... Mat mounting plane, 21...
...Rectangular part, 22, 68 ... Core insertion hole, 24 ...
Apron part, 61... Rectangular base part, 62... Accommodation recessed part, 63... Apron base part.

Claims (1)

[Scope of utility model registration request] On the back side of the heat-receiving plate, which forms the mat mounting plane on which the mosquito repellent mats to be fumigated by electric heating are placed, a positive temperature coefficient thermistor, which is enabled to conduct electricity between the thermally conductive and insulating edge members, is placed for inserting the following core. The heating assembly is fixed by being placed adjacent to the hole, and the core insertion hole is sized to form a transpiration gap around the inserted chemical liquid suction core. A heating device for an electric mosquito repellent.