JP4716219B2 - Heating device for liquid evaporator - Google Patents

Description

  The present invention relates to a heating device that heats and evaporates a liquid such as a liquid chemical for a liquid electric mosquito trap or an aromatic liquid for an aroma.

  As a device that heats the liquid absorption core to evaporate the liquid in a liquid electric mosquito collector etc. that dissipates the insecticidal gas by heating the liquid absorption core infiltrated with the insecticidal liquid by capillary action from the outer periphery. Patent Document 1 discloses a heat generating device shown in FIG.

  This apparatus includes a case 21 having a recess having an opening on the surface 28 facing the bottom 27, a case lid 26 that closes the opening 28 of the case 21, and electrodes 34 and 35 on opposite surfaces. A positive temperature coefficient thermistor 22 that is a heating element disposed in the recess so that the electrodes 34 and 35 face the bottom 27 and the opening surface 28, and the positive temperature coefficient thermistor 22 in the recess. It consists of a combination of electrode terminals 23 and 24 which are superimposed on the electrodes 34 and 35 and led out to the outside from the opening surface 28 side, and a heat radiation member 31 having a heat radiation cylinder 25 and bent pieces 29 and 30. It is.

  The heat radiating cylinder 25 is disposed on the outer surface of the bottom of the case 21, the bent pieces 29 and 30 are attached to both ends in the axial direction, and the bent pieces 29 and 30 are folded on the back side of the case 21. Rarely, the heat radiating cylinder 25 is attached to the case 21.

  According to the description of Patent Document 1, it is possible to completely prevent the chemical solution from entering the recess of the case 21, and therefore, it is possible to prevent deterioration of the positive temperature coefficient thermistor 22 due to the chemical solution intrusion and to improve reliability. The effect is emphasized.

  By the way, in the case of the heat generating device, the electrode terminal 24 arranged facing the case lid side has the spring portion 32 and the flat plate portion 33, and the flat plate portion 33 is elastically applied to the electrode 34 by the spring pressure of the spring portion 32. As is apparent from FIG. 5, the spring portion 32 is formed by folding one side edge of the flat plate portion 33 toward the other side edge. Naturally, the one side edge 36 of the flat plate portion 33 connected to and the other side edge 37 of the flat plate portion 33 to which the spring portion 32 is not connected differ in the magnitude of the elastic force that the spring portion 32 acts on. There is a partial difference in the contact pressure between the electrode terminal 24 and the thermistor 22, and as a result, there may be cases where the stability of conduction between the thermistor 22 and the electrode terminal 24 is not necessarily ensured, and the heat generation temperature may become unstable. There .

Further, the case 21 is made of an electrical insulator having excellent thermal conductivity and chemical resistance, such as alumina, and the bottom portion has a closed surface that does not have openings such as holes and holes. In this example, the heat dissipating surface necessary for heating the body 25 is the upper bottom surface of the case 21 in the figure, and using a material having excellent thermal conductivity including the four peripheral surfaces of the case 21 generates heat energy. Is not desirable from the point of view of utilization efficiency.
Utility Model Registration No. 2569725

  The problem to be solved is that in the structure of the spring portion of the electrode terminal in the heating device described in Patent Document 1, the contact pressure between the electrode terminal and the thermistor element is biased. As a result, the thermistor element and the electrode The stability of conduction between terminals may not be ensured, and the use of a bottomed alumina case for housing the thermistor element results in a large loss of heat generation energy.

  In the present invention, in order to ensure the stability of conduction between the heating element and the pair of electrode terminals, a pair of spring seats having elasticity are formed facing each other on both sides of the electrode terminal on which the spring property is imparted. As a case for accommodating the electrode terminal paired with the heating element, the entire surface of the heating element is seated stably on the plate surface of the lower lid so that the entire surface of the heating element is pressed against the plate surface of the electrode terminal. Using a combination of a rectangular tube and an upper lid made of a material with excellent thermal conductivity that covers the opening on one surface and a heat-insulating lower lid, the heat generated by the heating element is dissipated to other than the upper lid that serves as the mounting surface of the radiation cylinder. The main feature is to increase the efficiency of heat utilization.

  In the heat generating device of the present invention, the spring action of the pair of spring seats provided at the opposite edges of the flat plate of the electrode terminal is applied to the heat generating element so that the heat generating element is uniformly pressed between the pair of electrode terminals. The entire surface can be uniformly pressed against the plate surfaces of the pair of electrode terminals to stably generate heat. In addition, the heat generated by the heat generating element is transmitted to the heat radiating tube mainly through the heat conductive sheet on the top cover that covers the top opening of the heat insulating tube. There is an advantage that can be.

  The purpose of uniformly pressing the heating element and the pair of electrode terminals to generate heat stably was realized by improving the shape of the electrode terminals.

  FIG. 1 is an exploded perspective view of a main part of the heat generating device according to the present invention, FIG. 2A is a front sectional view in the assembled state, and FIG. In the figure, a heat generating device for a liquid evaporator according to the present invention comprises a combination of a heat insulating cylinder 1, an upper lid 2, a lower lid 3, a heat generating element 4, a pair of electrode terminals 5, 6 and a radiator 7. Yes. In the present invention, the distinction between the upper and lower sides is for the convenience of explanation when explaining with reference to FIGS. 1 and 2, and either may be the upper side or the lower side. Further, as will be described later, when the heat generating device is incorporated into the evaporator, the heat insulating cylinder 1 is erected, and is used in the upright posture of FIG. 4 with the upper lid 2 as the front and the lower lid 3 as the rear.

  The heat insulating cylinder 1 is a hollow rectangular tube whose upper and lower surfaces are open, and is a synthetic resin molded body having heat insulating properties. The upper lid 2 is a thermally conductive sheet that closes the upper opening surface of the heat insulating cylinder 1. In this embodiment, an electrically insulating sheet excellent in thermal conductivity and chemical resistance, for example, an alumina sheet is used. The lower lid 3 is an insulating plate having heat insulating properties that closes the lower opening surface of the heat insulating cylinder 1. In this embodiment, a synthetic resin sheet made of the same material as that of the heat insulating cylinder 1 is used.

  The heat generating element 4 is a disc-shaped or square chip-shaped positive temperature coefficient thermistor having electrodes on both sides of a parallel plane, and is disposed in the heat insulating cylinder 1 so that the electrode surface faces the upper and lower opening directions. The electrode terminals 5 and 6 make a pair and each have a tongue 8 for a lead terminal. One electrode terminal 5 is disposed on the upper lid 2 side with the heating element 4 interposed therebetween, and the other electrode terminal 6 is disposed on the lower lid 3 side and is superimposed on the electrode of the heating element 4.

  The electrode terminal 5 on the upper lid 2 side has a flat plate as an electrode pressure contact portion, and the electrode terminal 6 on the lower lid 3 side has a flat plate as an electrode pressure contact portion and a pair of spring seats 9, 9 formed on opposite edges of the flat plate. It is what. FIG. 3 shows a processing example of the electrode terminal 6 on the lower lid 3 side. 3A, the electrode terminal 6 on the lower lid 3 side has a tongue piece 8 for a lead terminal at one edge, and plate-like extension portions 11 and 11 at both ends of a flat plate portion 10 which becomes an electrode contact portion. The pair of spring seats 9, 9 are formed by bending the extended portions 11, 11 respectively. In the bending process, first, as shown in FIG. 3B, each extended portion 11 is bent to one surface side of the flat plate 10, and the folded portion is further bent as shown in FIG. The rising height of about the height of the heat insulating cylinder 1 is ensured, and the folded portion is made springy.

  When assembling, first, the heat generating element 4 is sandwiched between the pair of electrode terminals 5 and 6 and placed in the heat insulating cylinder 1, and a silicon adhesive is applied to the upper opening edge and the lower opening edge of the heat insulating cylinder 1. The upper lid 2 is adhered to the upper opening edge of the heat insulating cylinder 1 and the lower lid 3 is adhered to the lower opening edge of the heat insulating cylinder 1, and the upper and lower opening edges of the heat insulating cylinder 1 are covered with the upper lid 2 and the lower lid 3, respectively. . As shown in FIG. 2, each of the electrode terminal lead terminal tongues 8 and 8 is bent at a right angle toward the lower end opening side of the heat insulating cylinder 1 and is exposed to the outside through a gap between the heat insulating cylinder 1 and the lower lid 3. Pull out.

  The heat radiating body 7 includes a heat radiating tube 13, and fastening edges 14, 14 projecting outward from the heat radiating tube 13 at part of the upper and lower opening edges of the heat radiating tube 13. The heat radiating cylinder 13 is a part into which a liquid absorption core for a chemical solution is inserted, and is arranged on the outer surface of a part of the outer peripheral surface in close contact with the sheet surface of the upper lid 2 that closes the upper opening of the heat insulating cylinder 1. is there. The upper and lower fastening edges 14, 14 of the radiating cylinder 13 extend along the outer surface across the opposing surface of the heat insulating cylinder 1, and are folded back to the lower surface side of the lower lid 3 that covers the lower surface opening and assembled to the heat insulating cylinder 1. The heat generating device 12 is assembled, and the upper and lower lids 2 and 3 are pressure-bonded to the heat insulating cylinder 1.

  The upper and lower lids 2, 3 are bonded to the heat insulating cylinder 1, and the upper and lower lids 2, 3 are further crimped to the heat insulating cylinder 1 by the upper and lower fastening edges 14, 14 of the heat radiating cylinder 13, thereby forming a pair of electrodes. The terminals 5 and 6 are pressurized between the upper lid 2 and the lower lid 3, and the spring seats 9 and 9 are compressed, and the pair of electrode terminals 5 and 6 are brought into close contact with the heating element 4 by the spring action to generate heat. The entire surface of the element 4 is pressed against the flat surfaces of the electrode terminals 5 and 6 evenly. When incorporating the heat generating device 12 of the present invention into a liquid evaporator (not shown), the heat generating device 12 is erected at right angles from the inverted posture shown in FIG. 3 is converted to a posture in which the heat radiating cylinder 13 is vertical.

  In the liquid evaporator, a liquid absorption core 15 that is partially immersed in a chemical solution in a container filled with a drug is vertically attached. When the absorbent core 15 is inserted into the heat radiating cylinder 13 from below and a direct current is supplied to the heating element 4 through both tongue pieces 8 and 8 to generate heat, the heat is transmitted through the electrode terminals 5 to the alumina sheet of the upper lid 2. Then, the heat radiating cylinder 13 in contact with the upper lid 2 is heated, and the liquid absorbent core 15 is heated from the surroundings to dissipate the medicine.

  In addition, although the heat | fever which the heat generating element 4 emitted is filled in the square cylinder of the heat insulation cylinder 1 through the upper and lower electrode terminals 5 and 6, since the heat insulation cylinder 1 and the lower cover 3 are made of synthetic resin which has heat insulation, heat insulation is carried out. Heat dissipation from the four circumferential surfaces of the cylinder 1 and the lower lid 3 is suppressed, and the heat is dissipated mainly through the heat conductive sheet of the upper lid 2.

  Further, the pair of spring seats 9, 9 formed on both sides of the electrode terminal 6 on the lower lid 3 side are seated on the inner surface of the lower lid 3 and are pressed by the fastening edges 14 of the radiator 7. Each portion of the plate surface of the terminals 5 and 6 is in close contact with the heat generating element 4 so that the contact resistance with respect to the heat generating element 4 is not biased, so that the heat generation of the heat generating element 4 can be stabilized.

  In the above embodiment, the spring seats 9 and 9 of the electrode terminal 6 are seated on the upper surface of the lower lid 3, and the heating element 4 is brought into close contact with the plate surface of the electrode terminal 6. Although the contact stability is ensured, conversely, the plate surface of the electrode terminal 6 can be seated on the upper surface of the lower lid 3, and the heating element can be supported across the spring seats 9, 9.

  INDUSTRIAL APPLICABILITY The present invention can be widely utilized as a liquid transpiration heating device that heats and evaporates chemicals, aromatic liquids, and other liquids in a liquid electric mosquito trap.

It is a disassembled perspective view in the principal part of the heat generating apparatus by this invention. (A) is the front view of the heat generating apparatus by this invention, (b) is the same side view. (A)-(c) is a figure which shows the point which processes a spring seat in an electrode terminal. It is a figure which shows the attitude | position in the use condition of the heat generating apparatus by this invention. It is a disassembled perspective view in the principal part of the heat generating apparatus (positive characteristic thermistor apparatus) described in Patent Document 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat insulation cylinder 2 Upper lid 3 Lower lid 4 Heating element 5, 6 Electrode terminal 7 Radiator 8 Tongue piece 9 Spring seat 10 Flat plate part 11 Extension part 12 Heating device 13 Radiation cylinder 14 Fastening edge 15 Absorption core

Claims (2)

A heat generating device having a heat insulating cylinder, an upper lid, a lower lid, a heat generating element, an electrode terminal, and a radiator,
The heat insulating cylinder is a hollow rectangular tube whose top and bottom are open, and has heat insulating properties,
The upper lid is a thermally conductive sheet that closes the upper opening surface of the heat insulating cylinder,
The lower lid is a heat insulating plate that closes the lower opening surface of the heat insulating cylinder,
The heating element is a positive temperature coefficient thermistor that has electrodes on opposite surfaces of a parallel plane, and is arranged in a heat insulating cylinder so that the electrodes face the upper and lower opening surfaces.
The electrode terminals form a pair, each having a tongue for a lead terminal, one electrode terminal is disposed on the upper lid side, and the other electrode terminal is disposed on the lower lid side, and the heating element is disposed in the heat insulating cylinder. Superimposed on the electrode,
The electrode terminal on the upper lid side is a flat plate, and the electrode terminal on the lower lid side has a pair of spring seats on opposite edges of the flat plate,
The pair of spring seats is one in which the extension part of the flat plate is folded back so that the folded part has springiness, and the tongue pieces for the lead terminals are each pulled out to the outside of the square tube,
The radiator has a tightening edge that protrudes outward from the radiator tube and a part of the upper and lower opening edges of the radiator tube,
The heat radiating cylinder is disposed on an outer surface thereof in contact with a heat conductive sheet that closes an upper opening of the heat insulating cylinder,
The upper and lower tightening edges of the heat radiating tube straddle the heat insulating tube, and are further folded back to the lower surface of the lower lid so that the heat radiating tube is pressed against the outer surface of the upper lid and is pressed against the lower lid. Heating device for evaporator.   The pair of spring seats is formed by folding the flat plate parts into a curved surface facing each other. The tops of the folded parts of both spring seats are supported by the plate surface of the lower lid, and the thermistor element is pressed against the plate surface of the flat plate. The heat generating device for a liquid evaporator according to claim 1, wherein the heat generating device is used.

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