JP3043016B2 - Heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Technical Field of the Invention) The present invention relates to a heat generating device used as, for example, a heat source for evaporating insecticide in an electric mosquito trap.

(Prior Art) FIG. 6 shows a cross section of a heating device used in a liquid type electric mosquito trap. In the figure, reference numeral 1 denotes an insulating case body having an opening at one end surface and a circular outer periphery, and a cylindrical wall portion 1a protruding toward the opening at the one end surface is integrally provided at a central portion thereof. In the case body 1, an insulating heater holder 5 holding a heating element 4 made of a positive temperature coefficient thermistor having terminal plates 2 and 3 adhered to both sides thereof is housed. An insulating case lid 6 for closing the opening is housed. The case body 1 and the case lid 6 are connected by a heating cylinder 7 made of metal rivets provided through the wall 1a.
The heating element 4 is formed in a ring shape, and the terminal portions 2a, 3a extending integrally from the terminal plates 2, 3 on both sides thereof are inserted through the case lid 6 and pulled out to the outside. Have been. In addition, a current fuse as a circuit protection component is connected to one of the terminals outside the case body 1 via a lead wire (not shown), so that a short circuit that is likely to occur at the end of the life of the heating element 4 is prevented. Regardless,
The safety of the heating device is ensured.

In addition, 8 in FIG. 6 is a chemical bottle containing an insecticide,
Reference numeral 9 denotes a ceramic core which sucks up the insecticide in the bottle 8 by capillary action, and the upper end of the core 9 is inserted into the heating cylinder 7.

In such a heating device, the ring-shaped heating element 4
When power is supplied to the heating element 4, the heating element 4 generates heat, and the heat is mainly transferred from the inner peripheral surface of the heating element 4 to the heating cylinder 7 through the heater holder 5 and the wall 1 a. Accordingly, the wick 9 is heated, whereby the insecticidal liquid sucked up by the wick 9 is evaporated and used for killing insects such as mosquitoes.

(Problems to be Solved by the Invention) However, in the conventional configuration, the heating element 4 is formed in a ring shape in order to heat the heating cylinder 7 from the entire circumference thereof. Is occupied and stored. Therefore, there is a problem that the heating element 4 is large and the entire heating device formed corresponding to the shape of the large heating element 4 must be large. Further, as described above, since the annular heating element 4 occupies most of the internal space of the case body 1, the current fuse (not shown) has to be arranged outside the case body 1. Therefore, the connection is troublesome, the lead wire is required, and the current fuse connected by the lead wire must be installed separately from the heating device. Yes, after all, the conventional heating device was expensive. In addition, since the circuit protection components connected to the terminal board are arranged outside the case body 1 as described above, the circuit protection components are limited to current fuses, and the use of temperature fuses, protection resistors, etc. Was impossible.

Therefore, a first object of the present invention is to provide a heat generating device that can be made compact as a whole together with a heat generating element.

It is a second object of the present invention to provide a heat generating device that can improve the workability of connecting electric components and the ease of incorporating the heat generating device into a mounting portion while achieving the first object.

Further, a third object of the present invention is to achieve various advantages while achieving the first object by selecting and using various circuit protection components.
An object of the present invention is to provide an inexpensive heat generating device that can be easily incorporated into a mounting portion of the heat generating device.

[Means for Solving the Problems] In order to achieve the first object, the heat generating device according to claim 1 has an insulating case body having an opening on one side and a cylindrical inner periphery. And a non-annular positive temperature coefficient thermistor-made heating element in which an annular internal space of the case body occupies a part of its circumferential direction and whose terminals are in close contact with both surfaces, respectively, and an inner periphery of the case body. A heating cylinder provided to cover the cylindrical wall portion; and a heat transfer member that transfers heat of the heating element from the outer peripheral surface side of the heating cylinder to the heating cylinder. .

In order to achieve the second object, the heat generating device according to claim 2 includes an insulating case main body having an opening on one side and a cylindrical inner periphery, and an annular internal space included in the case main body. A non-annular heating element made of a positive temperature coefficient thermistor occupying a part in the circumferential direction and having terminals adhered to both sides thereof, and a heating cylinder provided to cover a cylindrical wall portion on the inner periphery of the case body. A heat transfer member that transfers heat of the heating element from the outer peripheral surface side of the heating cylinder to the heating cylinder, and any one of the two terminals accommodated in the internal space of the case main body avoiding the heating element. And an electrical component for circuit protection directly attached to one of them.

In order to achieve the third object, a heating device according to a third aspect of the present invention is arranged such that one end surface is opened and the outer periphery of the heat generating device projects substantially toward the center of an insulating case main body having a tubular shape toward the one end opening. A cylindrical wall portion to be provided is integrally provided, and a non-annular heating element made of a positive temperature coefficient thermistor whose terminals are closely adhered to the screen is occupied in the inner space of the case main body in a part of its circumferential direction and stored. The non-storage portion forms a component storage space in the case body, and an insulating plate overlapping the terminal on the one end face opening side, and the one end face opening overlapping the insulating plate and closing the one end face opening. A heat transfer plate having good heat conductivity is housed in the case main body, and the heat transfer plate and the case main body are provided through the cylindrical wall, and the heat conductivity is higher than that of the case main body. Connect with a heating tube for good caulking, One is characterized in that to the component housing space housing the electrical components directly mounted to the circuit protection to either one of the Ryotanshi.

(Function) In the heat generating device according to the first aspect, the heat of the heat generating element housed in the case main body is transmitted to the heating cylinder by the heat transfer member from the outer peripheral surface side, and the object to be heated positioned inside the heating cylinder is conveyed. ,
It is heated annularly from its surroundings. Thus, it is not necessary to use a ring-shaped heater element that occupies most of the ring-shaped internal space of the case body, and the heater element has a size that occupies a part of the case body, that is, the case body. A non-annular heating element can be used that is occupied in the annular internal space occupying a part of its circumferential direction.

Also, in the heating element of the second aspect, the heat of the heating element housed in the case main body is transmitted to the heating cylinder via the heat transfer member from the outer peripheral surface side, and the object to be heated positioned inside the heating cylinder is transferred. Since the heating element is heated in a ring shape from the outer periphery, a non-ring-shaped heating element that occupies a part in the circumferential direction in the ring-shaped inner space of the case main body and is accommodated therein can be used as the heating element. Moreover, since the electric parts for protecting the circuit are directly attached to the terminals in close contact with the heating element and housed in the case body, there is no need to connect the electric parts and the heating element via lead wires, and The heat generating element can be incorporated into the case body by handling these electric components and the heat generating element in an integrated manner without the need for individually assembling the heat generating element.

Further, in the heat generating device according to the third aspect, the heat generated by energizing the heat generating element mainly passes through the terminal, the insulating plate overlapping the terminal, and the heat transfer plate, and the heat connected to the heat transfer plate. Heat is transferred to the tube. In such a main heat transfer path, since the heat transfer plate is connected to the entire periphery of the end of the heating cylinder,
Heat is quickly transmitted not only to the heating element side but also to the entire heating cylinder. Therefore, the temperature of the entire heating cylinder quickly rises to a predetermined temperature even though the heating element does not surround the entire circumference of the heating cylinder. In addition, the heating cylinder heats an object to be heated disposed therein from the outer periphery thereof.

As described above, the heating element is made smaller than the case main body, and there is no problem in heating despite being housed in a part of the case.Therefore, a component storage space can be secured in the case main body. Electric parts for circuit protection can be arranged. Therefore, the heating device can be made compact as a whole, and the electric components are built into the case main body.
The trouble of assembling the electric component alone can be omitted. In addition, since the component storage space is formed near the heating element, a thermal fuse or the like can be used as an electrical component for circuit protection. Either one can be selected and used, and the range of design can be expanded.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

FIG. 5 is a vertical sectional side view of a liquid type electric mosquito trap.
In the figure, reference numeral 11 denotes a body formed by connecting a first body constituent member 12 and a second body constituent member 13, and an outlet is provided at a central portion at an upper portion thereof.
A lid 15 having 14 is attached. A switch 16 for a heating device, which will be described later, is attached to a lower peripheral surface of the housing 11, and a code protector 17 is attached. A power cord 18 is passed through the protector 17.

A screw portion 19 is formed at an upper portion of the first body component member 12, and a tank 20 housed inside the first body component member 12 is detachably screwed to the screw portion 19. . tank
Numeral 20 stores an insecticide therein, and a ceramic core 21 which sucks up the insecticide by capillary action.

Further, a plurality of core supporting ribs 22 are formed on the upper part of the first body component member 12 above the screw part 19, and the ribs 22 protrude above the tank 20 by the ribs 22. To prevent the core 21 from falling down. In addition, a plurality of device fixing holes 23 are provided at an upper portion of the first body component member 12 outside the screw portion 19 and the rib 22.

A heating device 25 is mounted on the upper surface of the first body component member 12 by fitting it into the device fixing hole 23. The device 25 protrudes from a hole 13a provided at the center of the upper surface of the second body component member 13, and is held down from the upper side by the edge of the hole 13a and is prevented from coming off.

Next, the heating device 25 will be described in detail with reference to FIGS.

In the figure, reference numeral 26 denotes a case body made of an electrically insulating material such as a synthetic resin. The case body 26 has a cylindrical outer periphery and an open end, and a cylindrical wall 27 protruding toward the opening of the one end is provided substantially in the center. I have. Reference numeral 28 denotes an attachment piece integrally projecting from the outer peripheral surface of the case body 26. A fixing pin 29 integrally projecting from the case body 26 is press-fitted into the device fixing hole 23, so that the heating device 25 is turned into a first body. It is adapted to be attached to the component member 12.

Further, at least one spacer projection 30 (see FIG. 1) protrudes from the inner surface of the case body 26 facing the one end opening, and an insulating partition wall 31 integrally projects toward the one end opening. Have been. 32 is an annular step,
33 and 34 are cutouts, both of which are the case body 26
Is provided at one end opening edge.

In the case main body 26, that is, a part of an annular internal space formed between the cylindrical outer periphery and the inner peripheral cylindrical wall portion 27 of the case main body 26 has, for example, a substantially semicircular positive characteristic. A heating element 35 made of a thermistor is housed in such a manner that plate-like metal terminals 36 and 37 having the same substantially semicircular shape are brought into close contact with both surfaces thereof. Due to this storage, a part storage space E is formed in the case main body 26 by the non-storage part of the heating element 35. Electrodes (not shown) are formed on both surfaces of the heating element 35, and these electrodes and the terminals 36 and 37 are adhered to each other using a conductive adhesive so as to be electrically connected. .

One terminal 36 is in contact with the spacer protrusion 30, and
Thereby, conduction of heat of the heating element 35 to the case main body 26 is reduced. The terminal 36 has an L-shaped terminal portion.
36a is provided integrally, and this terminal portion 36a is
It is led out of the case body 26 through 33.

Further, the other terminal 37 on the one end opening side has terminals 38a, 38b that a protection resistor 38 as an electric component for circuit protection has.
One of them is connected via a solder or a conductive adhesive. An escape groove 39 is formed in a corresponding portion of the heating element 35 so that the terminal connection portion does not impair the adhesion to the electrode. The protection resistor 38 is housed in the component housing space E between the inner peripheral surface of the case main body 26 and the insulating partition 31. The second
In the figure, reference numeral 31a denotes an escape groove for passing the terminal 38a. And
The other terminal 38b of the protection resistor 38 is led out of the case body 26 through the cutout 34.

In addition, the case body 26 has a terminal 37 on the one end face opening side.
A heat transfer plate 41 that covers the insulating plate 40 and closes the opening at one end face is stored.

The insulating plate 40 is formed of mica or the like that is thinner than the wall 27 and has better heat conduction than the case body 26. Further, the insulating plate 40 is provided with an arc-shaped through hole 42 for passing the terminal 38b of the protective resistor 38. The heat transfer plate 41 as a heat transfer member is formed in a substantially annular shape from a metal material having good heat conductivity such as an aluminum alloy, and a cutout groove 43 for passing the terminal 38a is also provided in the heat transfer plate 41. I have.

Further, the heat transfer plate 41 and the case main body 26 are
27, they are connected by a heating cylinder 44 made of, for example, metal rivets provided to cover the inner peripheral surface of the wall 27. The heating cylinder 44 has better heat conductivity than the case body 26, and the inner surface of the case body 26 and the components stacked and housed inside the body 26 adhere to each other due to the caulking force applied at the time of attachment (connection). Is to be retained. The end 44a of the heating cylinder 44 on the heat transfer plate 41 side is
The heat transfer plate 41 is in close contact with the entire periphery of the central hole 41a. The core 21 is inserted and arranged inside the heating cylinder 44. Of course, the upper end of the core 21 is arranged immediately below the outlet 14.

The heating element 35 of the heating device 25 configured as described above is
When the switch 16 is turned on, it is connected to a power supply and generates heat. And the generated heat is mainly made of metal terminals
37, heat is transferred to the heating cylinder 44 connected to the heat transfer plate 41 through the insulating plate 40 and the heat transfer plate 41 made of metal. A part of the heat passes through the wall 27 of the case body 26 and the heating cylinder 44
However, since the thermal resistance of the wall portion 27 is larger than that of the heat transfer path, most of the generated heat is transferred to the heating cylinder 44 from the outer peripheral surface side through the heat transfer path described above.

In such a main heat transfer path, since the heat transfer plate 41 is connected to the entire periphery of the end portion 44a of the heating cylinder 44, heat is quickly transmitted not only to the substantially semicircular heating element 35 side but also to the entire heating cylinder 44. Reportedly. Therefore, the temperature of the entire heating cylinder 44 is quickly increased to the predetermined temperature even though the heating element 35 is substantially semicircular.

The heating cylinder 44 thus heated to a high temperature heats the core 21 disposed therein from the outer periphery thereof, so that the insecticidal liquid sucked up by the core 21 is evaporated, and the evaporated component is covered with the lid 15. It flows out through the outflow port 14 and is used for killing insects such as mosquitoes.

Further, according to the configuration of the heating device 25, no problem occurs in heating even when the heating element 35 is formed in a substantially semicircular shape. That is, the outer periphery of the core 21 of the liquid-type electric mosquito trap can be annularly heated without forming the heating element 35 in an annular shape. Can be used. Therefore, the heating element 35
And the heat generating device 25 as a whole can be made more compact. Further, as described above, since the heating element 35 has a size occupying a part of the internal space of the case main body 26, a component storage space E can be secured in the case main body 26, and there is an electric component for protecting the circuit there. The protection resistor 38 can be stored and arranged.

Accordingly, the entire heating device 25 can be made compact, and the incorporation of the protective resistor 38 into the case body 26 can save the trouble of incorporating the protective resistor 38 into the housing 11 alone. In addition, since the protection resistor 38 is directly attached to the terminal 13, it is possible to eliminate the trouble of connecting the lead wire and the lead wire, and it is possible to reduce the cost in combination with the improvement of the assembling workability described above.

In addition, since the component storage space E is formed near the heating element 35, a temperature fuse can be used as an electric component for circuit protection instead of the above-described protection resistor.
Instead of these, a current fuse can be used. As described above, any one of the protective electric components such as the thermal fuse, the protective resistor, and the current fuse can be selected and used, so that the design range can be expanded.

[Effects of the Invention] The present invention has the following effects because it is configured as described above.

According to the first aspect of the invention, the outer periphery of the object to be heated such as the core of the liquid-type electric mosquito trap can be annularly heated without forming the heating element in an annular shape. It is possible to use a non-annular one that is large enough to occupy a part of the space in the circumferential direction, thereby making the heating element more compact and, when forming the case body accordingly, the entire heating device. Compactness can also be achieved.

According to the second aspect of the present invention, similarly to the first aspect of the present invention, the heating element includes the case main body having the inner cylindrical wall portion, the heating element, the heating cylinder, and the heat transfer member. The case can be used as a non-annular one that is large enough to occupy a part of its circumference in the annular internal space of the case body. In addition, the size of the entire heat generating device can be reduced. Further, in the present invention, the electric parts for protecting the circuit are directly attached to the terminals in close contact with the heating elements and are housed in the case body, so that the workability of connecting the electric parts can be improved, and the heat generating device can be improved. Can also be easily incorporated into the mounting portion.

According to the third aspect of the present invention, since the main heat transfer path for transmitting heat generated in the heating element made of the positive temperature coefficient thermistor to the heating cylinder via the terminal, the insulating plate, and the heat transfer plate is provided, the case body is provided in the heating element. It is possible to use a non-annular one that is large enough to occupy a part of its circumference in the annular internal space, and also has a component storage space inside the case body, in which electrical components for circuit protection are stored. Can be stored. Therefore, incorporation of the heating device into the mounting portion can be facilitated, lead wires and the connection thereof can be reduced in time and cost, and the electric components can be arranged close to the heating element. Can be selectively used.

[Brief description of the drawings]

1 to 5 show one embodiment of the present invention. FIG. 1 is a longitudinal side view of the entire heating device, FIG. 2 is a bottom view of the entire device with some parts removed, and FIG. Is a bottom view of the entire device,
FIG. 4 is an exploded perspective view of the heating device, and FIG. 5 is a longitudinal side view of an electric mosquito catcher incorporating the heating device. FIG. 6 is a vertical sectional side view of a conventional heating device. 26 ... case body, 27 ... wall, 35 ... heating element, 36, 37 ... terminal, 38 ... protection resistor, 40 ... insulating plate, 41 ... heat transfer plate (heat transfer member), 44 …… Heating tube, E …… Parts storage space.

Continuation of the front page (56) References JP-A 63-112301 (JP, U) JP-A 59-82986 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05B 3 / 14 A01M 1/20

Claims (3)

(57) [Claims] An insulative case body having an open side and an inner periphery having a cylindrical shape, and an annular inner space of the case body occupying a part of its circumferential direction and terminals on both sides. A heating element made of a non-annular positive temperature coefficient thermistor with which the heating element is provided so as to cover the inner cylindrical wall of the case body; And a heat transfer member for transferring heat to the heating cylinder. 2. An insulative case body having an open side and a cylindrical inner periphery, and an annular inner space of the case body occupying a part of its circumferential direction and terminals on both sides. A heating element made of a non-annular positive temperature coefficient thermistor with which the heating element is provided so as to cover the inner cylindrical wall of the case body; A heat transfer member that transfers heat to the heating cylinder, and a circuit protection electrical component that is housed in the internal space of the case body while avoiding the heating element and that is directly attached to one of the two terminals. A heating device, comprising: 3. An insulative case body having an open end and a cylindrical outer periphery, and a cylindrical wall protruding toward the one end opening is integrally provided at a substantially central portion of the main body. A non-annular heating element made of a positive temperature coefficient thermistor with a close contact is occupied in the inner space of the case main body in a part of its circumferential direction, and the non-storage part forms a component storage space in the case main body. And an insulating plate overlapping the terminal on the one end face opening side, and a heat transfer plate overlapping the insulating plate and closing the one end face opening, and having better heat conductivity than the case body. The heat transfer plate and the case main body are provided through the cylindrical wall portion, and are connected by a caulking heating cylinder having better thermal conductivity than the case main body, and the component storage space is provided. Within either of the above terminals Heating and wherein one that accommodates the directly mounted to the circuit electrical components for protection or.