JP7078954B2 - Heat generator for liquid evaporation - Google Patents

Description

The present invention relates to a heat generating device for liquid evaporation that heats an object to be heated such as a liquid absorbing core of a heating and evaporating device.

Conventionally, this type of heat generating device includes a metal radiator, a heating unit using a heating element (PTC thermistor element, cement resistance, etc.), and an insulating plate between the radiator and the heating unit. It is known that heat is dissipated from a heat radiating portion by generating heat in a heat generating unit and heating a heat radiating body through an insulating plate (see Patent Document 1).

The heat radiating body of Patent Document 1 is a cylindrical body having a D-shape in a plan view, and the flat surface portion is heated by a heat generating unit via an insulating plate. The heat generation unit has a heat generation element formed in a flat columnar shape and a pair of electrodes for supplying power from both sides thereof, and the heat generated by the heat generation element heats one electrode and contacts the electrode. By heating the insulating plate, it is transmitted to the radiator.

In such a configuration, the heat generated by the heat generating element is transferred to the radiator through the electrodes and the insulating plate, so that a loss of heat is generated before the heat is transferred to the radiator. Further, in the conventional heat generating device, heat is transferred to the flat portion of the radiator which is D-shaped in a plan view, and heat is transferred from there to the portion extending in an arc shape, so that the flat portion and the arc-shaped portion The temperature distribution varies with and.

Further, recently, there is an increasing need to operate a heat generating device with a low voltage such as a low voltage power supply instead of a household 100 volt power supply. However, the PTC thermistor element conventionally used as a heat source for this type of heat generating device cannot obtain the required amount of heat unless it is a 100 volt power supply. Further, even in the case of other heat generating elements, in the configuration having the above heat loss, there is a possibility that the required temperature cannot be achieved by a power source such as a low voltage power source.

Further, in the conventional configuration, even if the temperature can be raised to the required temperature, it is necessary to increase the amount of heat generated by the heat generating unit in order to compensate for the heat loss, which is inconvenient in that the power consumption increases. There is.

Japanese Unexamined Patent Publication No. 2008-35797

INDUSTRIAL APPLICABILITY In order to solve the above-mentioned inconvenience, the present invention provides a heat generating device for liquid evaporation, which can raise the temperature to a required temperature even with low power consumption and can make the temperature distribution of the heat radiating portion uniform. The purpose is.

In order to achieve the above object, the heat generating device for liquid evaporation of the present invention is connected to a cylindrical radiator, a pair of electrodes attached at positions apart from each other in the axial direction of the radiator, and a pair of electrodes. It is characterized by having a heating element that is in close contact with the outer surface of the radiator.

According to the heat generating device for liquid evaporation of the present invention, since the heating element is provided in close contact with the outer surface of the tubular radiating element, the heat generated from the heating element is directly transmitted to the radiating element, so that the amount of heat is lost. It is possible to raise the temperature to the required temperature even with a small amount of power consumption. Further, since the heating element is directly brought into close contact with the radiator, the device can be downsized as compared with the conventional device in which the heating element is assembled via an insulator.

Further, in the heat generating device for liquid evaporation of the present invention, it is preferable that the heating element is cylindrical and the heating element is spirally adhered along the outer peripheral surface of the radiator. According to this configuration, since the cylindrical radiator is heated by the heating element that is in close contact with the spiral, the entire radiator is heated uniformly as compared with the case where a part of the radiator is heated as in the conventional case. can do.

Further, in the heat generating device for liquid evaporation of the present invention, the heating element may be provided with a portion where the density in the axial direction of the radiator becomes coarse and a portion where the density becomes dense. According to this configuration, the temperature distribution in the axial direction of the radiator can be changed, so that the optimum temperature distribution of the radiator can be realized for each purpose of use.

Further, in the heat generating device for liquid evaporation of the present invention, the electrodes have an electrode body that abuts on the outer surface of the cylindrical radiator body and projects from the electrode body toward the inside of the radiator body in the axial direction of the radiator body. It is preferable to have an inner flange portion that can come into contact with the end portion of the. According to this configuration, since the pair of electrodes is positioned on the radiator by the inner flange portion, the positions of the electrodes can be secured even when an impact is applied from the outside.

Further, in the heat generating device for liquid evaporation of the present invention, the heating element may be formed of a linear resistor or may be formed of a film resistor fixed to the outer surface of the radiator. When the heating element is formed of a linear resistor, the heating amount can be easily adjusted by changing the number of turns of the spiral shape, for example. Further, when the heating element is formed of a film resistor, the film resistor can be formed by a vapor deposition method, a plating method, or the like, and the calorific value can be easily adjusted by trimming or the like.

The explanatory view which shows the appearance of the heat generating apparatus for liquid evaporation which is 1st Embodiment. It is explanatory drawing which shows the heat generation unit provided in the inside of the heat generation apparatus for liquid evaporation of FIG. Explanatory drawing which shows the state which disassembled the heat generation unit of FIG. The explanatory view which shows the heat generation unit of the 2nd Embodiment. The graph which shows the evaporation amount of the liquid between the heat generating apparatus of 1st Embodiment and a conventional product. The graph which shows the evaporation amount at the time of an experiment so that the evaporation amount (g) of the liquid at each time of the heat generating apparatus of 1st Embodiment and a conventional product becomes equivalent.

Next, the liquid evaporation heat generating device 1 (hereinafter referred to as “heating device 1”) according to the embodiment of the present invention will be described with reference to FIGS. 1 to 6. As shown in FIG. 1, the heat generating device 1 of the first embodiment is a device capable of inserting a liquid absorbing core (not shown; the same applies hereinafter) of the heated transpiration device into the inside of the heated transpiration device (not shown). It is attached to.

As shown in FIGS. 1 to 3, the heat generating device 1 includes a cylindrical radiator body 2, a pair of substantially ring-shaped electrodes 3 and 4 provided at both ends of the radiator body 2 in the axial direction, and electrodes 3. It is provided with a heating element 5 connected between the electrodes 3 and 4, terminals 6 and 7 connected to each of the electrodes 3 and 4, and a housing 8 for covering these members. In the heating device 1, as shown in FIG. 2, the heating element 2 and the heating element 5 and the like excluding the housing 8 are the heating units 9.

In the heat generating unit 9, the radiator 2 is made of an insulating material such as alumina and has high thermal conductivity. The inner diameter of the radiator 2 is formed to be one size larger than the outer diameter of the liquid absorbing core which is the object to be heated. The thickness of the radiator 2 is determined in consideration of thermal conductivity and strength. The direction indicated by reference numeral A in FIGS. 1 to 4 indicates the axial direction of the radiator 2.

The electrodes 3 and 4 are made of a conductive material such as stainless steel. In the first embodiment, a cylindrical electrode body 3a, 4a and inner flange portions 3b, 4b that project inward of the radiator 2 and can abut on the end face in the axial direction are provided. The electrodes 3 and 4 are in contact with the axial end portion of the radiator body 2 by the inner flange portions 3b and 4b, and are positioned with respect to the radiator body 2. The terminals 6 and 7 are attached to the outer peripheral surfaces of the electrode bodies 3a and 4a.

The heating element 5 uses a nichrome wire in the first embodiment, and is spirally formed along the outer surface of the heat radiating body 2 so as to be in close contact with the outer surface of the heat radiating body 2 as shown in FIG. There is. Further, as shown in FIG. 2, the heating element 5 is densely wound in the lower region of the radiator 2 in the axial direction, and is roughly wound in the upper region.

As described above, in the first embodiment, the heating element 5 is provided with regions having different densities in the axial direction of the heating element 2. Further, the upper end 5a of the heating element 5 is connected to the electrode 3, and the lower end 5b is connected to the electrode 4 (see FIG. 3).

The terminals 6 and 7 are used by inverting a metal member formed in the same shape upside down. The terminals 6 and 7 have elasticity, respectively, and are connected so as to be pressed against the electrodes 3 and 4. The ends of the terminals 6 and 7 opposite to the electrodes 3 and 4 project from the housing 8 and are connected to the power supply wiring (not shown) of the heating transpiration device.

The housing 8 is made of synthetic resin and can be divided into upper and lower parts. The housing 8 is formed by accommodating a heat generating unit 9 inside in a state of being divided into upper and lower parts and combining the divided parts. Further, the housing 8 is located below the protruding terminals 6 and 7, and is formed with a fixing portion 8a for fixing to the main body (not shown) of the heating transpiration device.

In the heating element 1 of the first embodiment, a heating element 5 formed of a nichrome wire is spirally wound around a cylindrical heating element 2, and the heating element 5 is in close contact with the outer peripheral surface of the heating element 2. There is. Since the heat radiating body 2 is formed of alumina and has a high thermal conductivity, the heat generated by the heating element 5 is directly transferred to the heat radiating body 2, and the inner peripheral surface of the heat radiating body 2 is efficiently heated. Therefore, even if the power supply supplied to the terminals 6 and 7 is a power supply supplied from a low voltage power supply of, for example, about 5 volts, the radiator 2 can be raised to a required temperature.

In the first embodiment, since the heating element 5 is spirally wound around the outer peripheral surface of the heat radiating body 2, the heating element 2 is uniformly heated when viewed from the axial direction of the heat radiating body 2. .. This makes it possible to heat the heated body evenly as compared with the conventional configuration in which heat is applied to a part of the heat radiating body.

Further, in the first embodiment, the heating element 5 is wound so that the upper part of the heating element 2 becomes coarse and the lower part becomes dense. Therefore, the lower portion of the heating element 5 has a high temperature, and the upper portion of the radiator 2 has a lower temperature than the lower portion.

In this case, the larger the difference between the coarse portion and the dense portion, the larger the difference in temperature distribution. On the other hand, the smaller the difference between the part and the dense part, the more uniform the temperature distribution becomes. Therefore, depending on the purpose of use of the heating device 1, the temperature distribution of the heating element 5 may be uniform or different.

Further, the heating element 5 is provided in close contact with the heating element 2, but the outside of the heating element 5 (the side opposite to the heating element 2) is provided with a space between the heating element 5 and the housing 8. .. Since an air layer exists between the inner peripheral surface of the housing 8 and the heating element 5, the heat generated from the heating element 5 is less likely to be transmitted to the housing 8 side.

Here, the amount of evaporation when the liquid was evaporated was compared between the heat generating device 1 of the first embodiment and the conventional heat generating device having the configuration described in Patent Document 1 (hereinafter referred to as "conventional product"). The results are shown below. In this experiment, the power supply was adjusted so that the temperature of the heating element 5 was the same for both heating devices. Further, the liquid absorbing core protruding from the container filled with the liquid was arranged inside the radiator 2 and the conventional radiator.

The heating device 1 can heat the heating element 5 to a temperature similar to that of a conventional product using a normal commercial power source by using a power source of about 5 volts. When the temperature of the cylindrical heating element 5 and the center of the upper end of the conventional heating element was actually measured by operating the heating device 1 and the conventional product, the temperature of the heating device 1 was higher than that of the conventional product. I got the result that it was high.

Further, when the heat radiating body 2, the heating body 5, and the conventional product were confirmed by thermography, in the heat generating device 1 of the present embodiment, the heat radiating body 2 and the heat generating body 5 were uniformly heated in the circumferential direction. On the other hand, in the conventional product, it was confirmed that the heat radiating body close to the heat generating unit and the radiating body away from the heat generating unit have significantly different temperatures, and the temperature distribution varies.

Further, the graph of FIG. 5 shows the result of measuring the evaporation amount of the liquid in the container in a state where both are energized so as to have the same heat generation temperature. In FIG. 5, the vertical axis is the evaporation amount (g) of the liquid, and the horizontal axis is the time (h). In FIG. 5, the black circle points are the evaporation amount of the heat generating device 1 of the present embodiment, and the black square points are the evaporation amount of the conventional product. As shown in FIG. 5, it has been clarified that the heat generating device 1 of the present embodiment can evaporate about 1.8 times as much liquid as the conventional product.

On the other hand, as shown in FIG. 6, the electric power supplied to the heat generating device 1 is reduced so that the evaporation amount (g) of the liquid at each time becomes the same. That is, in the heat generating device 1 of the present embodiment, the evaporation amount of the liquid equivalent to that of the conventional product can be obtained with low power consumption. As a result, deterioration due to heat generated by the heat generating device 1 itself can be reduced.

As described above, since the heat generating device 1 of the present embodiment can have the same temperature as the conventional product even with a low power consumption and low power consumption, the liquid equivalent to the conventional product is evaporated with low power consumption. Can be made to.

Therefore, when the heat generating device 1 of the present embodiment is used as the heat generating device of the heating and evaporating device, it can be used wherever there is a low voltage power supply, for example, a mobile battery for a smartphone or a power supply terminal of a personal computer. Etc. can also be used.

Next, the heat generating device 11 according to the second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 4, in the heating element 11 of the second embodiment, the heating element 12 is different from the heating element 5 of the first embodiment. In the heat generating device 11 of the second embodiment, other configurations are the same as those of the heat generating device 1 of the first embodiment, and therefore, the same components are designated by the same reference numerals and detailed description thereof will be omitted. .. Further, in FIG. 4, the housing 8 is not shown.

The heating element 12 of the second embodiment is formed of a film-shaped film resistor, and a film of the resistor is formed on the outer peripheral surface of the radiator 2, and the film is trimmed to form a spiral heating element. It is set to 12.

The heating element 12 uses a nickel-phosphorus alloy film formed by electroless plating or a nichrome-based film formed by sputtering, and is fixed to the surface of the radiator 2 in a state of 1 μm in thickness. .. Further, the upper and lower ends of the heating element 12 are connected to the electrodes 3 and 4, respectively. As a result of conducting an experiment on the heat generating device 11 of the second embodiment, the same experimental results as those of the heat generating device 1 of the first embodiment were obtained.

Since the heat generating devices 1 and 11 of the present embodiment have the above configuration, they can be used as a heat transpiration device, a heat generating device for aromatherapy that dissipates a fragrance, or a chemical spraying device that dissipates a transpiration agent. It can be used as a heat generating device.

In the heating device 1 of the first embodiment and the heating device 11 of the second embodiment, the heating elements 5 and 12 are formed in a spiral shape, but the shapes of the heating elements 5 and 12 are limited to this. It can be any shape. For example, the heating elements 5 and 12 may have a wave shape in which the axial direction of the heating element 2 is the amplitude direction and the circumferential direction of the heating element 2 is the wavelength direction.

Further, in the first embodiment, the amount of heat generated can be adjusted by arbitrarily changing the material, outer diameter, or cross-sectional shape of the linear heating element 5. Further, in the case of the heating element 12 of the second embodiment, the heating element 12 can be formed by fixing a resistor to the entire surface of the radiator 2 and etching an unnecessary portion. Therefore, the heating element 12 can have an arbitrary shape such as a geometric shape according to the intended use, and the amount of heat generated can be adjusted.

Further, in the above embodiment, the radiator 2 uses alumina as a material, but in addition, a material having high thermal conductivity such as aluminum nitride may be used. Further, if the heating elements 5 and 12 and the heat radiating body 2 are insulated from each other, it is not necessary to use the heating element 2 as an insulator.

Further, in the above embodiment, the radiator 2 has a cylindrical shape, but a square tubular member having a rectangular plan view or another polygonal tubular member having a plan view may be used. In this case, the electrode 3 can be shaped to match the shape of the end portion of the radiator body 2.

Further, in the above embodiment, the electrodes 3 and 4 are provided at the axial end portion of the radiator body 2, but the present invention is not limited to this, and the cylinder is flat in the axial direction without forming 3b and 4b. The shape of the electrode may be used and fixed at an arbitrary position in the axial direction of the radiator 2.

1 ... heat generating device, 1 ... heat generating device for liquid evaporation, 2 ... radiator, 3 ... electrode, 3a ... electrode body, 3b ... inner flange, 4 ... electrode, 4a ... electrode body, 4b ... inner flange, 5 ... Heat generator, 6 ... Terminal, 6 ... Heat generator, 7 ... Terminal, 8 ... Housing, 8a ... Fixed part, 9 ... Heat generation unit, 11 ... Heat generator, 12 ... Heat generator.

Claims (6)

With a tubular radiator
A pair of electrodes attached to the radiator at a distance in the axial direction,
A heating element for liquid evaporation, comprising a heating element connected to the pair of electrodes and in close contact with the outer surface of the radiator. The heat generating device for liquid evaporation according to claim 1.
The radiator is cylindrical and has a cylindrical shape.
The heating element is a heating element for liquid evaporation, characterized in that the heating element is spirally adhered along the outer peripheral surface of the radiator. The heat generating device for liquid evaporation according to claim 1 or 2.
The heating element is a heat generating device for liquid evaporation, characterized in that a portion where the density in the axial direction of the radiator becomes coarse and a portion where the density becomes dense are provided. The heat generating device for liquid evaporation according to any one of claims 1 to 3.
The electrode has an electrode body that abuts on the outer surface of the tubular body and an inner flange portion that protrudes inward from the electrode body and can abut on the axial end of the radiator. A heat generating device for liquid evaporation, which is characterized by being equipped. The heat generating device for liquid evaporation according to any one of claims 1 to 4.
The heating element is a heating element for liquid evaporation, characterized in that it is formed of a linear resistor. The heat generating device for liquid evaporation according to any one of claims 1 to 4.
The heating element is a heat generating device for liquid evaporation, characterized in that the heating element is formed of a film resistor fixed to the outer surface of the radiator.

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