WO2011052874A1

WO2011052874A1 - Heating apparatus

Info

Publication number: WO2011052874A1
Application number: PCT/KR2010/004449
Authority: WO
Inventors: 박만욱; 박성원
Original assignee: 웅진코웨이주식회사
Priority date: 2009-10-30
Filing date: 2010-07-08
Publication date: 2011-05-05

Abstract

Provided is a heating apparatus comprising: a ceramic heater having a plurality of plate-shaped ceramic plates; and a housing in which the ceramic heater is installed and in which a water inlet and water outlet are defined, wherein in order to enable bubbles, formed in a fluid by means of heating by the ceramic plates (122, 124), to rise at edges of the ceramic plates when the fluid flows through a passage formed along the ceramic plates (122, 124), the ceramic plates (122, 124) are disposed in parallel and vertically upright within the housing (140), and the water outlet (144) is defined at the top of the housing (140).

Description

Heating device

The present invention relates to a heating apparatus having a ceramic heater.

Fig. 1A is a sectional view of a heating apparatus with a conventional ceramic heater, and Fig. 1B is a perspective view of a conventional ceramic heater.

Referring to FIGS. 1A and 1B, the heating device 1 includes a housing 10, a ceramic heater 20 mounted in the housing 10, and a ceramic heater 20 in the housing 10. It comprises a fixing member 30 for fixing.

The housing 10 and the ceramic heater 20 are formed in a cylindrical shape and are usually disposed coaxially. The fixing member 30 is provided with a water inlet communicating with the internal space of the ceramic heater 20, and a water outlet is formed in the housing 10. Therefore, the water entering the inlet flows through the outer space of the ceramic heater 20 after passing through the inner space of the ceramic heater 20 and is discharged through the outlet. When water flows through the inner space of the ceramic heater 20, it is heated in contact with the inner wall of the ceramic heater 20, and when water flows through the outer space of the ceramic heater 20, it is heated in contact with the outer wall of the ceramic heater 20. The heated water is discharged to the outlet.

However, as shown in FIG. 1B, since the heating wire 22 installed inside the conventional ceramic heater 20 is disposed close to the outer wall side of the ceramic heater 20, heating by the inner wall of the ceramic heater 20 is performed. There is little effect and it is mainly heated only by the outer wall. In this way, since the water obtained in the heating device 1 is mainly heated when flowing through the external space of the ceramic heater 20, the actual heating time becomes very short, and thus the heating wire of the ceramic heater 20 in order to obtain hot water of high temperature. It is not desirable for energy efficiency because high power must be applied to (22).

In view of this point, Korean Patent No. 0880773 proposes a fluid heating device that improves heating efficiency. Looking at a specific configuration thereof, a flat ceramic heater 102 having a terminal lead wire 101 for power supply is disclosed. ), And a gap in which the fluid to be heated is moved in the direction of the ceramic heater 102 to the upper and lower sides of the ceramic heater 102 and has a horizontal moving fluid path so that the fluid heated by the ceramic heater 102 is discharged. On the outer surface of the plate 105, the flow path forming plate 106 coupled with the fluid passage so that the fluid on the horizontal moving fluid path can be vertically moved to the fluid path of the next layer, and the uppermost separation plate 105 An upper cover 111 coupled with an inlet hole 110 for supplying a fluid for heating, and an outlet hole 112 for discharging the heated fluid to an outer surface of the lowermost partition plate 105. The lower cover 113 is to be characterized in that the finish is configured.

According to the configuration proposed in the above document, the plate-shaped ceramic heater 102 is provided, and the spacer plate 105 and the flow path forming plate 106 are disposed so that flow paths are formed above and below the ceramic heater 102, Water introduced through the inlet hole 110 is heated while being in contact with the upper and lower surfaces of the ceramic heater 120 and is discharged through the outlet hole 112. According to such a configuration, since heat is transferred by contacting water with a wide surface of the flat plate ceramic heater 102, heating efficiency may be improved.

However, the structure of the above document in which the flat ceramic heater 102 is disposed in the horizontal direction and water flows from the upper inlet hole 110 to the lower outlet hole 112 has the following problems.

Figure 2 shows the flow path of the fluid heating device configured as described above. Referring to FIG. 2, it can be seen that water introduced from the upper inlet hole 110 exits the lower outlet hole 112 through the flat ceramic heater 102, and the water of the ceramic heater 102. When the upper surface flows, the ceramic heater 102 is always in contact with the heater, but when the lower surface of the ceramic heater 102 flows, the ceramic heater 102 does not come into contact with the ceramic heater 102 (see the section marked with "O"). Of course, if the inflow of water is high and the water pressure is high, the water may flow through the entire flow path, but if the inflow is low or the water pressure is low, the water cannot be guaranteed to flow through the entire flow path, and if not, it is indicated as "O". In the flow path formed on the lower surface of the ceramic heater 102 as in one portion, flowing water does not come into contact with the ceramic heater 102.

As such, when the flowing water does not come into contact with the ceramic heater 102, there are the following problems.

First, heat is wasted because water does not contact the ceramic heater 102 and the heating efficiency is lowered.

Second, in the flow path where the water does not contact the ceramic heater 102, air is rapidly heated by contacting the ceramic heater 102 instead of water, so that a sudden temperature difference occurs and thermal shock occurs. Since the ceramic heater 102 is vulnerable to thermal shock, there is a high risk of damage to the device.

Third, when the amount of water inflow is high and the water pressure is high, the water flows through the entire flow path, so that the heating efficiency is increased. However, when the amount of water inflow is low and the water pressure is low, the non-contact part of the water and the ceramic heater 102 is generated to increase the heating efficiency. As a result, constant heating efficiency cannot be guaranteed, and hence accurate control is difficult.

Fourth, even if the water flows through the entire flow path due to the high inflow of water and the high water pressure, if the water is heated on the heating surface, the gas dissolved in the water will have a lower solubility as the temperature of the water rises, resulting in bubbles and bubbles. The thermal shock is generated, the document proposes to increase the aspect ratio of the cross section of the heating flow path in order to prevent this. In other words, the width of the heating flow path is three times larger than the height of the heating flow path (i.e. flat). This configuration increases the heating area per unit volume, increases the heating efficiency and speeds up the flow, thereby increasing air absorption and The opportunity for bubble growth can be eliminated, thereby preventing thermal shock of the ceramic heater 102. However, to increase the width of the heating flow path is to increase the width of the ceramic heater 102, that is, to use the ceramic heater 102 in a large way. As such, when a large ceramic heater 102 is used, thermal shock due to the generation of bubbles can be prevented, but a problem arises in that the volume becomes large and the cost increases.

In addition, the above document discloses the use of a plurality of ceramic heaters 102, but the heat generation amount of the plurality of ceramic heaters 102 is the same. There is.

The present invention has been devised to solve the problems of the prior art, by which the water is heated in contact with the front surface of the ceramic heater to increase the heat transfer efficiency, to prevent the thermal shock due to the generation of bubbles, to provide a heating device capable of precise temperature control For the purpose of

According to a first aspect of the present invention for achieving the above object, comprising a ceramic heater having a plurality of plate-shaped ceramic plate, and a housing on which the ceramic heater is mounted and formed with an inlet and an outlet; When the fluid flows through the flow paths formed along the 122 and 124, the

ceramic plates

122 and 124 are mounted in the housing so that bubbles generated in the fluid by the heating of the

ceramic plates

122 and 124 rise to the edges of the ceramic plate. It is arranged upright inside the 140 and side by side, the outlet 144 provides a heating device formed on the upper side of the housing 140.

According to a second aspect of the present invention, the ceramic heater includes a first ceramic plate disposed on the inlet side and a second ceramic plate disposed on the outlet side, and wherein the first ceramic plate and the second ceramic plate A partition is installed in between.

According to a third aspect of the invention, the first ceramic plate and the second ceramic plate is attached to one end of the housing and spaced apart from the other end, the partition wall is attached to the other end of the housing and The wealth is spaced apart.

According to a fourth aspect of the present invention, a flow path is formed wider at the outlet side than at the inlet side.

According to a fifth aspect of the invention, a gap is formed between an upper end of the ceramic plate and the housing.

According to a sixth aspect of the invention, the outlet is formed higher than the inlet.

According to the seventh aspect of the present invention, the outlet side is inclined so as to be disposed upward so that bubbles generated in the fluid by heating are easily discharged.

According to an eighth aspect of the present invention, an area of the ceramic plate is formed larger than the cross-sectional area of the flow path.

According to a ninth aspect of the present invention, a heating wire provided inside the ceramic plate is disposed at the center in the thickness direction of the ceramic plate.

According to a tenth aspect of the present invention, power applied to the first ceramic plate and the second ceramic plate is different.

According to an eleventh aspect of the present invention, the power applied to the second ceramic plate is greater than the power applied to the first ceramic plate.

According to a twelfth aspect of the present invention, a fixed power is applied to the first ceramic plate and a variable power is applied to the second ceramic plate.

According to the present invention, since water flowing into the inlet is heated in contact with all surfaces of the two ceramic plates while flowing in a zigzag flow path, heat transfer is efficiently performed without wasting heat, and thermal shock due to bubble generation is prevented.

In addition, by adjusting the temperature of a small range in the first ceramic plate, and adjusting the temperature of a large range in the second ceramic plate, heat can be efficiently transferred and power consumption can be reduced.

2 is a perspective view of a heating apparatus with another conventional ceramic heater.

3 is a perspective view of a ceramic heater according to an embodiment of the present invention.

4 is a cross-sectional view of the heating apparatus with the ceramic heater according to the embodiment of the present invention seen from above.

5 is a cross-sectional view of the heating apparatus with the ceramic heater according to the embodiment of the present invention seen from the front.

6 is a cross-sectional side view of a heating apparatus with a ceramic heater according to an embodiment of the present invention.

7 is a sectional side view of a heating apparatus according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view of a ceramic heater 120 according to an embodiment of the present invention.

Referring to FIG. 3, the ceramic heater 120 includes a first ceramic plate 122 and a second ceramic plate 124 disposed in parallel. The first ceramic plate 122 and the second ceramic plate 124 are formed in the same plate shape. Hot wires 123 (not shown) are disposed in the

ceramic plates

122 and 124. The heating wire 123 (not shown) is centered in the thickness direction of the

ceramic plates

122 and 124 so that heat emitted from the heating wire 123 may be uniformly transmitted to both surfaces of the

ceramic plates

122 and 124. Is placed.

At the edges of the

ceramic plates

122 and 124, 'A' regions where no heating wires 123 (not shown) are disposed are formed. That is, when the fluid flows, an area A for preventing damage to the

ceramic plates

122 and 124 due to bubbles generated in the fluid by heating the

ceramic plates

122 and 124 may be disposed at the edges of the

ceramic plates

122 and 124. .

More details on preventing breakage of the

ceramic plates

122 and 124 will be described later.

A fixing member 126 is installed at one side of the ceramic heater 120 so that two

ceramic plates

122 and 124 may be fixed to the fixing member 126. In addition, the fixing member 126 may be coupled to one end of the housing 140 to be described later.

Terminals

122a and 124a for supplying power to the

ceramic plates

122 and 124 are provided on the opposite side of the fixing member 126 to which the

ceramic plates

122 and 124 are fixed. The

terminals

122a and 124a may be connected to a controller (not shown), respectively, to control power supplied thereto.

Since the

ceramic plates

122 and 124 directly affect the heating time and the performance of the heater, it is necessary to set the optimum thickness and spacing.

When the thickness of the

ceramic plates

122 and 124 is thin, the heat transfer rate is fast and the heating time is short, so that it is possible to heat to the target temperature in a short time, but the mechanical strength becomes weak with the temperature change, making it difficult to commercialize. On the contrary, when the thickness of the

ceramic plates

122 and 124 is thick, the heat transfer rate is slow and the heating time is delayed, and when the power is cut off, post-heating may occur due to latent heat due to the temperature saturated on the heater surface. Therefore, the experiments in consideration of such performance and safety, it was found that the thickness of the ceramic plate (122, 124) is suitable to design about 1 ~ 3mm.

On the other hand, the gap between the

ceramic plates

122 and 124 is also an important factor. If the gap between the two

plates

122 and 124 is too narrow, the amount of fluid flowing between the plates is too small to obtain a sufficient amount of hot water. No problem may arise due to temperature rise. On the other hand, if the spacing between the

plates

122 and 124 is too wide, the amount of fluid increases, so that the amount of heat is insufficient to satisfy the performance. Therefore, experiments in consideration of the performance and safety, it was found that the distance between the two plates (122, 124) is preferably maintained at 2 ~ 15mm.

4 is a cross-sectional view of a heating device 100 having a ceramic heater 120 according to an embodiment of the present invention, and FIG. 5 is a heating device having a ceramic heater 120 according to an embodiment of the present invention. (100) is a sectional view seen from the front, and FIG. 6 is a sectional view seen from the side of the heating apparatus 100 provided with the ceramic heater 120 which concerns on embodiment of this invention.

As shown in FIGS. 4 to 6, the heating device 100 includes a ceramic heater 120, a housing 140, a cap member 160, and a bracket 180.

As the fixing member 126 of the

ceramic plates

122 and 124 is coupled to one end of the housing 140, the

ceramic plates

122 and 124 are fixedly disposed inside the housing 140. One end of the housing 140 may also be coupled to the bracket 180. The

ceramic plates

122 and 124 are formed shorter than the length of the housing 140. Therefore, when the

ceramic plates

122 and 124 are installed inside the housing 140, the ends of the

ceramic plates

122 and 124 may be spaced apart from the cap member 160, which will be described later, so that water may flow between the spaced apart portions. .

The cap member 160 is coupled to the other end of the housing 140. The partition member 162 is attached to the cap member 160 so that the partition member 162 is disposed between the two

ceramic plates

122 and 124 when the cap member 160 is coupled to the other end of the housing 140. . The partition wall 162 extends in the longitudinal direction of the housing 140 to divide the space between the two

ceramic plates

122 and 124. The partition wall 162 is formed to be shorter than the length of the housing 140, so that the partition wall 162 is spaced apart from one end of the housing 140 when the partition wall 162 is installed inside the housing 140. Thus, water can flow between the spaced apart.

The

ceramic plates

122 and 124 are installed upright in the housing 140 and side by side. That is, the plate-shaped

ceramic plates

122 and 124 are installed vertically, so that bubbles generated by the heating of the

ceramic plates

122 and 124 can rise upward.

The inlet 142 and the outlet 144 are formed in the housing 140. The inlet 142 is formed at the side where the first ceramic plate 122 is disposed, and the outlet 144 is the second ceramic plate 124. Is formed on the side where it is disposed. In addition, the inlet 142 and the outlet 144 are provided at one end of the housing 140, that is, at the side to which the fixing member 126 of the

ceramic plates

122 and 124 is coupled. On the other hand, the inlet 142 and the outlet 144 is formed on the upper side of the housing 140. In particular, since the outlet 144 is disposed at the upper portion, the heated water in the housing 140 may be pushed upward and discharged.

On the other hand, it is preferable to form the area of the

ceramic plates

122 and 124 larger than the cross-sectional area of a heating flow path. In FIG. 3, the area of the

ceramic plates

122 and 124 is denoted by S, and in FIG. 5, the cross-sectional area of the heating channel is denoted by P. In FIG. P is the sum of the cross-sectional areas P1, P2, P3, and P4 of the

flow paths

①, ②, ③, and ④. By forming the area S of the ceramic plate larger than the cross-sectional area P of the flow path, water passing through the flow path can receive sufficient heat from the ceramic plate.

The operation method of the heating apparatus 100 comprised as mentioned above is demonstrated.

First, the flow path will be described. Water flowing into the inlet 142 of the housing 140 flows between the first ceramic plate 122 and one side of the housing 140. At this time, water flows from one end (bracket 180 side) of the housing 140 to the other end (cap member 160 side) (hereinafter referred to as "euro ①"). At the other end of the housing 140, the water is redirected through the spaced space between the first ceramic plate 122 and the cap member 160. The redirected water flows through the space between the first ceramic plate 122 and the partition wall 162. At this time, water flows toward one end from the other end of the housing 140 (hereinafter referred to as "euro ②"). At one end of the housing 140, water is diverted through the spaced space between the fixing member 126 and the partition wall 162. The redirected water flows through the space between the second ceramic plate 124 and the partition wall 162. At this time, water flows from one end of the housing 140 toward the other end (hereinafter referred to as "euro ③"). At the other end of the housing 140, water is diverted through the spaced space between the second ceramic plate 124 and the cap member 160. The redirected water flows between the second ceramic plate 124 and the other side of the housing 140. At this time, water flows toward one end from the other end of the housing 140 (hereinafter referred to as "euro ④"). Water is discharged to the outside through the water outlet 144 at the other end of the housing 140.

Next, the heating method will be described. In the flow path ① and the flow path ②, water is heated by the first ceramic plate 122. Specifically, it is heated by one surface of the first ceramic plate 122 in the flow path ①, and heated by the other surface of the first ceramic plate 122 in the flow path ②. Both surfaces of the first ceramic plate 122 emit the same heat, so water in the flow path ① and the flow path ② is heated by the same amount of heat. On the other hand, the water is heated by the second ceramic plate 124 in the flow path ③ and the flow path ④. Specifically, the flow path ③ is heated by one surface of the second ceramic plate 124, and in the flow path ④ is heated by the other surface of the second ceramic plate 124. Since both surfaces of the second ceramic plate 124 emit the same heat, the water is heated by the same amount of heat in the flow path ③ and the flow path ④.

As such, the water flowing into the inlet 142 is heated in contact with all surfaces of the two

ceramic plates

122 and 124 while flowing through the

channels

①, ②, ③, and ④, so that heat transfer is efficiently performed without wasting heat. That is, since the

ceramic plates

122 and 144 are installed upright in the vertical direction, and the outlet port 144 is disposed at the upper portion thereof, the water may be discharged while being pushed upwards without being drained out immediately. Thus, the water receives heat while contacting all surfaces of the

ceramic plates

122 and 124.

On the other hand, when the fine bubbles are generated and grown by the high heat transfer of the ceramic plate (122, 124) and attached to the surface of the ceramic plate (122, 124), the ceramic heater is caused by the thermal shock due to the temperature deviation due to local overheat The problem of breakage will occur.

In view of such a point, in the present invention, the width of the flow path was wider from the inlet 142 toward the outlet 144. 4 and 5, when the width of the flow path ① is t1, the width of the flow path ② is t2, the width of the flow path ③ is t3 and the width of the flow path ④ is t4, the relationship of t1 <t2 <t3 <t4 is Hold. In this way, by forming a wider flow path from the inlet 142 toward the outlet 144, the flow rate of the initial inlet is increased to suppress bubble growth (aggregation of fine bubbles), and the generated bubbles can be discharged at a high flow rate. have. Therefore, it is possible to prevent local overheating of the ceramic heater due to bubbles to prevent breakage of the heater. In this case, as illustrated in FIG. 5, a gap G may be formed between the upper ends of the

ceramic plates

122 and 124 and the housing 140 to easily discharge the generated bubbles.

In addition, as shown in FIG. 6, by arranging the outlet 144 higher than the inlet 142, the bubble exits to the higher side (that is, the outlet 144 side) to prevent local overheating of the ceramic heater by the bubble. You can prevent it.

Meanwhile, as shown in FIG. 7, the heating device 100 may be installed to be inclined at a predetermined angle. That is, when the heating device 100 is installed to be inclined upwardly, the water outlet 144 may be released to the water outlet 144 even if bubbles are generated inside the heating device 100, thereby preventing the problem of thermal shock. It is. Although not shown in the drawing, the water outlet 144 must be opened in the opposite direction as in FIG. 6, that is, upwards (left upward in the drawing) so that the bubbles can easily escape upwards.

Referring to the mechanism of preventing breakage of the

ceramic plates

122 and 124 due to the bubbles described above, the

ceramic plates

122 and 124 are disposed in the housing 140, and the water introduced into the inlet 142 is the housing 140 and the ceramic plate. The water flows through the

flow paths

1, 2, 2, 3, and ④ formed by the 122, 124, and the partition walls 162, and is discharged to the water outlet 144.

On the other hand, since the

ceramic plates

122 and 124 are arranged upright side by side in the housing 140, as shown in Figs. 4 and 5, the fluid (that is, water) is the flow path ①, flow path ②, flow path ③, flow path ④ As it flows, bubbles generated in the fluid by the heating of the

ceramic plates

122 and 124 rise to the upper side of the edges of the ceramic plates 122 and 124 (ie, the upper side in the region A of FIG. 3).

Subsequently, bubbles generated in the fluid by heating the

ceramic plates

122 and 124 are discharged to the outlet port 144 together with the fluid flowing along the

flow paths

1, 2, 3, and 4.

Therefore, it is possible to reduce the bubbles generated by the heating of the

ceramic plates

122 and 124 in contact with the

ceramic plates

122 and 124. In addition, even in contact with the upper side of the edges of the ceramic plates 122 and 124 (i.e., the upper side of the region A in FIG. 3) due to the growth of bubbles generated by the heating of the

ceramic plates

122 and 124, the region A is Since the heating wires 123 (not shown) are not disposed, breakage of the

ceramic plates

122 and 124 may be further reduced.

Specifically, breakage of the

ceramic plates

122 and 124 is caused by thermal shock. When thermal air is not water but heat exchanges with the

ceramic plates

122 and 124, the heat exchange is smaller than that of the

ceramic plates

122 and 124 which exchange heat with the surrounding water. A portion of the

ceramic plates

122 and 124 that exchange heat with air is overheated to generate a temperature difference. The shock applied by the temperature difference is called a thermal shock.

However, according to the present invention, even if bubbles are generated on the heating surface, the

ceramic plates

122 and 124 are disposed upright inside the housing, and since the bubbles are small in specific gravity compared to water, the bubbles are directed to the upper side of the edges of the

ceramic plates

122 and 124. Will rise.

Afterwards, bubbles raised to the upper side of the edges of the

ceramic plates

122 and 124 are positioned between the upper ends of the

ceramic plates

122 and 124 and the housing 140, thereby preventing the bubbles from contacting the

ceramic plates

122 and 124. have. Accordingly, the

ceramic plates

122 and 124 may be prevented from being damaged by thermal shock.

In addition, there is a region A in which the heating wires 123 (not shown) are arranged at the edges of the

ceramic plates

122 and 124. Since it comes into contact with the region A in which the heating wire 123 (not shown) is disposed, the thermal shock applied to the

ceramic plates

122 and 124 by the bubbles may be reduced.

On the other hand, it is preferable to control so that the power applied to the second ceramic plate 124 disposed on the outlet port 144 is greater than the power applied to the first ceramic plate 122 disposed on the inlet port 142. For example, 300 watts of power may be applied to the first ceramic plate 122, and 700 watts of power may be applied to the second ceramic plate 124. As such, relatively low heat is generated in the first ceramic plate 122 on the inlet 142 side to heat the water to a certain level, and then, when passing through the second ceramic plate 124, the set temperature is maintained. The water may be heated to be finally discharged to the outlet 144.

That is, the first ceramic plate 122 allows a small range of temperature adjustment, and the second ceramic plate 124 allows a large range of temperature adjustment, thereby efficiently transferring heat and reducing power consumption. It is.

On the other hand, since it is important to raise the water temperature to a certain level with the first ceramic plate 122, a fixed power is applied to the first ceramic plate 122, and the second ceramic plate 124 adjusts the temperature to a target temperature. Since it is important, the second ceramic plate 124 may be configured by applying variable power. Such power control is in charge of the control unit.

Claims

A ceramic heater 120 having a plurality of plate-shaped ceramic plates 122 and 124, and

The ceramic heater 120 is mounted and includes a housing 140 having an inlet 142 and an outlet 144,

When the fluid flows through the flow path formed along the ceramic plates 122 and 124, bubbles generated in the fluid by the heating of the ceramic plates 122 and 124 rise to the edge of the ceramic plate, so that the ceramic plates 122 and 124. ) Is placed upright in the housing (140) side by side, and the water outlet (144) is a heating device, characterized in that formed on the upper side of the housing (140).
The method according to claim 1,

The ceramic heater 120 includes a first ceramic plate 122 disposed on the inlet 142 and a second ceramic plate 124 disposed on the outlet 144.

A heating device, characterized in that a partition wall (162) is provided between the first ceramic plate (122) and the second ceramic plate (124).
The method according to claim 2,

The first ceramic plate 122 and the second ceramic plate 124 are attached to one end of the housing 140 and spaced apart from the other end,

The partition wall (162) is attached to the other end of the housing (140), characterized in that the heating device, characterized in that spaced apart from one end.
The method according to claim 1,

Heating device characterized in that the flow path is formed from the inlet (142) side toward the outlet (144) wider.
The method according to claim 1,

Heating device, characterized in that a gap (G) is formed between the top of the ceramic plate (122, 124) and the housing (140).
The method according to claim 1,

The outlet (144) is a heating device, characterized in that formed on the upper side than the inlet (142).
The method according to claim 1,

Heating area, characterized in that the area of the ceramic plate (122, 124) is formed larger than the cross-sectional area of the flow path.
The method according to claim 1,

Heating area, characterized in that the area of the ceramic plate (122, 124) is formed larger than the cross-sectional area of the flow path.
The method according to claim 1,

Heating device (123, 125) provided in the ceramic plate (122, 124) is disposed in the center in the thickness direction of the ceramic plate (122, 124).
The method according to claim 2 or 3,

Heating device, characterized in that the power applied to the first ceramic plate (122) and the second ceramic plate (124) is different.
The method according to claim 10,

Heating device, characterized in that the power applied to the second ceramic plate (124) is greater than the power applied to the first ceramic plate (122).
The method according to claim 10,

A fixed power is applied to the first ceramic plate (122) and a variable power is applied to the second ceramic plate (124).