KR940010696B1 - Protecting plate of ptc material - Google Patents

Abstract

The radiation plate of PTC thermistor for increasing the heat-radiating efficiency, has radiating fins with various kinds of circular or rectangular or involute type diameters. The plate comprises a water supply section (1) for supplying water for humidity; a humidifying section (3) for performing fumidifying by the PTC thermistor combined with the radiation plate (5); a pipeline (2) for supplying water from the section (1) to the humidifying section (3); a plurality of radiation fins with dissimilar diameters arranged on the radiation fin (5) at a certain distance.

Description

Heat sink of PTC element

1 is a cross-sectional view of the main portion of the steam humidifier is installed heat sink of the present invention.

2A-D are plan and side cross-sectional views of a heat sink used in a circular PTC element as an embodiment of the heat sink of the present invention.

3A-3D are plan and side cross-sectional views of a heat sink used in a rectangular PTC element as an embodiment of the heat sink of the present invention.

4 is a resistance-temperature characteristic diagram of a PTC device.

* Explanation of symbols for main parts of the drawings

1: water supply part 2: water pipe

3: humidifier 4: PTC element

5: heat sink 51: heat sink fin

The present invention relates to a structure of a heat sink for improving the heat dissipation efficiency of a PTC (Positive Temperature Coefficient Thermistor) element which is a constant temperature ceramic heating element. In particular, the heat sink is installed on the upper surface of a PTC element that humidifies water in a humidifying part of a steam humidifier. PTI formed heat sink fins in the form of a plurality of circles and squares with different diameters or widths, or involutes, but the height of the heat sink fins increases toward the edges rather than the height of the center heat sink fins to improve the heat dissipation efficiency of the heat sink. (Hereinafter referred to as PTC) relates to a heat sink of an element.

Conventional humidifiers use centrifugal spraying to splatter water by the rotational force of the motor, vaporization to directly evaporate the water by the wind by the rotational power of the motor, ultrasonic vibration by the ultrasonic vibration, and electrothermal heat to cut off water directly using nichrome wire. There is an expression.

However, since the former three methods use a motor, a lot of noise is generated, and various germs and fine impurities inhabiting in water are humidified together. The latter electrothermal method can sterilize germs and impurities, but nichrome Since the wire is not equipped with its own control function to control the power supply voltage, it generates the maximum heat according to the power supply capacity, which consumes a lot of energy and also implies the risk of fire due to overheating. In order to prevent the overheating, such as a separate safety device is required, of course, the life of the humidifier is shortened due to oxidation, there was a disadvantage that takes a very long time to generate steam.

Accordingly, in order to solve the above problems, a steam humidifier has been developed that adopts a predetermined PTC element, which is a constant temperature heating element, as a heating source.

That is, when a predetermined PTC element, which is a constant temperature heating element, is used, the heating rate is relatively faster than that of a heater such as a nichrome wire, and the time to vapor generation can be significantly shortened. The corrosion life and durability are excellent, and the life is semi-permanent. Due to the need for a separate transformer, it can be used at 110 / 220V, so the structure of the humidifier is very simple, and its power control function prevents fire due to overheating. Not only is it possible to kill germs and impurities in the water.

However, if the PTC element is to be used as a heating element of the humidifier as described above, the contact area of the PTC element in contact with water is small, so that it cannot dissipate a lot of heat in the water alone. There was a need for a heat sink having a structure that can be used.

The present invention has been made in order to solve these requirements, the heat sink is installed on the upper surface of the PTC element installed in the humidifying part of the steam humidifier, the upper surface of the heat sink is a plurality of circular and square of different diameters and widths It is possible to increase the heat dissipation efficiency of the heat sink by forming the heat sink fin or involute type heat sink fin at the same time and increasing the height of the heat sink fin toward the edge rather than the height of the center heat sink fin. Water is prevented from flowing rapidly into the center of the heat sink, so only a small amount of water can be evaporated momentarily, and the water heated between the heat sink fins is much smaller than the water of the humidifier. Even if spilled due to carelessness, there is less risk of burns, which can improve the reliability of the product. There is a purpose.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2A, the heat sink of the present invention includes: a water supply unit 1 for supplying water for humidification; A humidifier 3 for directly humidifying water by the heat generation of the PTC element 4 provided on the bottom surface integrally with the heat sink 5; In the steam humidifier composed of a water pipe (2) is provided between the water supply unit 1 and the humidifying unit (3) to send water supplied to the water supply unit (1) to the humidifying unit (3), the heat sink (5) It is to form a plurality of circular heat radiation fins 51 having a predetermined height on the upper surface of the () different in diameter at regular intervals.

2b-d shows another embodiment of the heat sink used for the circular PTC element 4, and (b) forms a '+' shaped groove dividing the circular heat sink fin 51 into quadrants. , (c) is a plate formed by bending the plate in the shape of an involute, so that the height of the heat dissipation fin 51 is higher from the center portion to the edge, (d) the height of the heat dissipation fin 51 made of circular Is the lowest, the lowest, and formed higher toward the edge.

On the other hand, Figure 3a-d is another embodiment of a heat sink for use when the PTC element 4 is a quadrangle, 3a-d is a plurality of different widths having a predetermined height on the upper surface of the heat sink 5 made of a rectangle Three rectangular heat dissipation fins 51 are formed at regular intervals, and FIG. 3b is a '+' shaped groove dividing the quadrangular heat dissipation fins 51 into four equal parts, and FIG. 3c is an involute shape. It is bent to form a height of the heat radiation fins 51 from the center to the edge toward the edge, and the height of the heat radiation fins (51) consisting of the 3d or the rectangle is the lowest in the center and formed toward the edge.

Here, reference numeral 6 is a power connection terminal, 11 is a rod (11) for opening and closing the inflow of water, 12 is a built-in sensor that blocks the operation of the humidifier when there is no water.

Referring to the operation and effect of the device of the present invention configured as described above are as follows.

First, when the PTC element 4, which is a constant-temperature ceramic heating element, is fixed together with a predetermined heat sink 5 formed of a material having a very good thermal conductivity when the PTC element 4, which is a constant temperature ceramic heating element, is installed on the bottom surface of the humidifier 3 formed in the steam humidifier, the PTC element ( The joule heat generated in 4) is located at the top thereof and is conducted to the heat sink 5 which is in direct contact with the water, so that the water is heated.

In this case, a plurality of circular or rectangular heat dissipation fins having a constant height and having different diameters and widths as shown in FIGS. 2A and 3A may be formed on the top surface of the heat dissipation plate 5 formed in a circular or quadrangular shape corresponding to the shape of the PTC element 4. As the 51 is formed at regular intervals, the contact area with water is greatly expanded so that the thermal emissivity of the heat sink 5 is greater than when only the PTC element 4 is installed or a heat sink having a flat plate shape is installed. It can be increased to heat the water rapidly.

In addition, as described above, when forming a '+' shaped groove as shown in FIGS. 2B and 3B in the heat dissipation fin 51 having a constant height and having a circular or quadrangular shape, the heat dissipation fins are divided into four equal parts. When the water supplied to the humidifying part 3 is transported through the water pipe 2, even though a small amount of water lower than the height of the heat dissipation fin 51 is transported between the heat dissipation fins through the '+'-shaped groove.

Therefore, even when the water level of the water delivered to the humidifying unit 3 is lower than the height of the heat dissipation fin 51, the water is humidified to prevent the loss of unnecessary heat generation.

In addition, the heat radiation fin of the heat sink 5 is bent into an involute shape using one plate material having an inclined upper surface such that the height of one end is lower than the height of the other end as shown in FIGS. 2C and 3C. In this case, since the height of the heat dissipation fin 51 has a higher formation from the center to the edge, the water transferred to the humidifier 3 through the water pipe 2 does not rapidly flow into the center of the heat sink 5, as shown by the arrow. It flows into the center along the heat dissipation fins 51.

Therefore, since the humidification is performed from the front end of the water flowing from the heat sink 5, the humidification of the water is instantaneously performed at the beginning of the operation of the humidifier, so that the steam is provided only when the temperature of the water delivered to the humidifying unit 3 is above a predetermined temperature as a whole. The humidification time can be significantly shortened than when discharged.

On the other hand, when the height of the heat dissipation fin 51 is formed as the center portion is the lowest and higher toward the edge, as shown in Figure 2d, 3d, the water delivered to the humidification unit 3 through the water pipe (2) If the water level stays in the humidification part 3 until the water level is higher than the height of the heat sink fin 51 located at the first edge, and the water level is higher than the height of the edge heat sink fin, the water flows gradually over the heat sink fin and enters the center of the heat sink 5. Afterwards, a predetermined time passes and maintains a constant level (that is, the level at which the heat radiation fin is completely locked).

That is, since the height of the heat radiation fin at the edge portion where the heat loss is relatively higher than the center portion of the heat sink 5 is higher than the center portion, the contact area with the water becomes large as a result, and the water in the humidifying portion 3 can be heated almost uniformly.

In addition, since the amount of hot water heated between the heat dissipation fins 51 is very small compared to the water flowing into the humidifier 3, the risk of burns when the water of the humidifier 3 is inadvertently spilled by the user. Can be reduced.

4 shows a typical temperature-resistance characteristic curve of the PTC element 4 used in the present invention. When the PTC element 4 reaches a specific temperature Tc which is Curie's Temperature, the resistance value is reached. Since this has a very large characteristic, when a predetermined voltage is applied to the device, Joule heat starts to increase and the heat generation rate increases, and when the temperature reaches Tm, it acts as a large load. As a result of the experiment, the PTC element acts as a large load at or below the predetermined temperature Tmax, so that the current flowing through the PTC element is greatly reduced before reaching the predetermined temperature Tm, and the temperature is decreased again.

As described above, when the temperature of the PTC element decreases, the resistance value decreases again and the generation of Joule heat increases again. This process is repeated within a very short time, so that the PTC thermistor maintains a substantially constant temperature.

That is, since the power control function is performed by itself, the temperature of the device is kept constant at all times to prevent fires due to overheating, and the heating speed is faster than that of the conventional nichrome wire, which greatly shortens the time to steam generation. Its durability and durability are semi-permanent, and the characteristics of the ceramic PTC device allow it to be used as a 110 / 220V without using a separate transformer, so the structure of the humidifier is very simple and the price is low.

As described above, according to the present invention, a plurality of circular and square heat dissipation fins having different diameters and widths may be formed on the top surface of the heat dissipation plate installed on the PTC element of the humidifier, or heat dissipation fins of involute type may be formed. As the height of the heat sink fin is increased toward the edge, the contact area with water becomes wider, so the heat dissipation efficiency of the heat sink is high, and the water is prevented from flowing rapidly into the center of the heat sink, and it can be evaporated instantaneously from a small amount of water. As a result, the leakage time of steam can be shortened, and the water heated between the heat sink fins is much less than the water of the entire humidification part. It is to improve the reliability of.

Claims (4)

A water supply unit 1 for supplying water for humidification; A humidifier 3 for directly humidifying water by the heat generation of the PTC element 4 provided on the bottom surface integrally with the heat sink 5; In the steam humidifier composed of a water pipe (2) is provided between the water supply unit 1 and the humidifying unit (3) to send water supplied to the water supply unit (1) to the humidifying unit (3), the heat sink (5) Heat dissipation plate of the PTC element, characterized in that formed on the upper surface of the plurality of heat dissipation fins (51) having a predetermined height at different intervals. The heat dissipation plate of claim 1, wherein the heat dissipation fins (51) are divided into four equal parts and a '+' shaped groove is formed on the heat dissipation plate (5). The device of claim 1, wherein the heat dissipation fin (51) is bent in an involute shape using one plate material having an inclined upper surface such that the height of one end portion is lower than the height of the other end portion. Heat sink. The heat sink of claim 1, wherein the height of the heat dissipation fins (51) is the lowest in the center portion and formed higher toward the edge.