JP2001355821A - Heat storage type deodorizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat storage type deodorizing device, restricting the rising of an inner pressure by restricting a resistance due to a pressure loss in the air passage of high temperature side to conduct gas, transmitted from low temperature side toward high temperature side, so as to flow smoothly without being precluded and capable of preventing the leakage of gas from the communicating place between a first flow passage and an air passage to a second flow passage into a heat exchanger room without increasing the power of a seal fan. SOLUTION: The heat storage type deodorizing device is provided with a plurality of air passages 2a, filled with heat storage material 2C and formed in parallel in the circumferential direction, and a heat storage body 2, constituted so as to be rotatable by driving so that exhaust gas passing condition for storing heat by exhaust gas from a combustion chamber is changed into treated gas passing condition and that the treated gas passing condition for preheating the passing treated gas is changed into the exhaust gas passing condition. In such a deodorizing device, respective flow passage sectional areas in the air passage 2a filled with the heat storage material 2C are formed so that the same areas are increased as the sections are approached to the high temperature side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for burning, that is, oxidatively decomposing odor components such as an organic solvent and a paint mist in a gas discharged from a painting factory or a printing factory. Specifically, a combustion chamber for burning odor components in the gas to be treated is provided, a plurality of ventilation paths filled with a heat storage material are formed side by side in the circumferential direction, and exhaust gas from the combustion chamber among the plurality of ventilation paths is provided. The object that was in the exhaust gas passing state in which heat is stored by passing the gas is in the gas-to-be-processed state, and the object that was in the gas-passing state in which the gas to be passed is preheated by the heat stored by the exhaust gas is the exhaust gas. The present invention relates to a heat storage type deodorizing device in which a heat storage body which is configured to be rotatable around an axis along the ventilation path so as to be in a passing state is provided and a heat exchange unit is formed.

[0002]

2. Description of the Related Art Conventionally, as this type of heat storage type deodorizing apparatus, the cross section of each flow path in an air passage filled with a heat storage material has been described.
Some were formed to have the same size on both the high temperature side and the low temperature side.

[0003]

In the combustion chamber, a heating process is performed by a burner to burn off the odor component in the gas to be treated. Since the thermal expansion occurs, the apparent flow velocity of the gas is increased. Conversely, the farther away from the combustion chamber, the lower the temperature and the contraction of the gas, which causes the apparent flow velocity of the gas to decrease. Therefore, when the gas that has passed through the low-temperature side ventilation path comes to the high-temperature side, the gas undergoes thermal expansion and the apparent flow velocity increases, but in the ventilation path as in the above-described conventional thermal storage deodorizer, If the cross section of each flow path on the high temperature side and the cross section of each flow path on the low temperature side are formed to the same size, the resistance due to pressure loss increases due to thermal expansion in the ventilation path on the high temperature side, and the internal pressure tends to rise. Therefore, the gas permeating from the low temperature side is hindered and does not flow smoothly. Also,
In the heat storage type deodorizing device, a heat storage body is installed in a heat exchanger room, a first flow path for introducing a gas to be treated into a combustion chamber connected to the heat storage body, and exhaust gas from the combustion chamber to the outside. A gas seal is provided to increase the pressure in the heat exchanger chamber so that gas does not leak from a portion communicating with the second flow path for discharging. If the pressure exceeds the pressure, the first flow path and the second flow path
A seal breakage occurs in which gas leaks into the heat exchanger chamber from a location communicating with the flow path. Due to this seal destruction, the gas to be treated introduced into the combustion chamber from the first flow path leaks into the heat exchanger chamber, and the odor component enters the second flow path without being treated and is discharged to the outside. There was a risk of it. For this reason, the power of the seal fan is increased to make the internal pressure in the heat exchanger chamber higher than the internal pressure in the first flow path, the second flow path, and the ventilation path, so that gas does not leak into the heat exchanger chamber. Because of the necessity, the power consumption of the seal fan is required extra, which is uneconomical.

Accordingly, an object of the present invention is to solve the above-mentioned problems, to suppress the increase in internal pressure by suppressing the resistance due to pressure loss in the ventilation path on the high-temperature side, and to reduce the gas permeating from the low-temperature side to the high-temperature side. A heat storage type deodorizer that can flow smoothly without obstruction and can prevent gas from leaking into the heat exchanger room from the communication point between the first flow path and the ventilation path to the second flow path without increasing the power of the seal fan. Equipment.

[0005]

As shown in FIG. 4, a combustion chamber for combusting odor components in a gas to be treated is provided and filled with a heat storage material 2C. A plurality of ventilation paths 2a are formed side by side in the circumferential direction,
Of the plurality of ventilation paths 2a, an object that has been in an exhaust passage state in which heat is stored by passing exhaust gas from a combustion chamber is in a gas-to-be-processed state, and the heat quantity in which the gas to be processed is stored by the exhaust gas. A heat storage unit 2 that is configured to be rotatable around an axis along the ventilation path 2a is provided so that an object that has been in a gas passing state to be preheated in an exhaust gas passing state is provided. In the heat storage type deodorizing apparatus thus configured, the cross section of each flow path in the ventilation path 2a filled with the heat storage material 2C is formed such that the flow path cross section becomes larger as the temperature becomes higher. .

As shown in FIG. 7A, a characteristic configuration of the second aspect of the present invention is that each of the flow paths is formed by a gap between a plurality of heat storage materials 2C filled in the ventilation path 2a. It is in.

As shown in FIG. 7 (b), the flow path is formed by a space formed between a plurality of heat storage material walls 2E filled in the ventilation path 2a. Where they are.

As shown in FIG. 7 (C), the flow path is formed by a communication hole 2F formed in a heat storage material 2C filled in the ventilation path 2a. There.

Note that, as described above, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Operation and Effect] According to the first aspect of the present invention,
Each flow path cross section in the ventilation path filled with the heat storage material,
Since the cross section of the flow path is formed larger on the higher temperature side, the gas permeating from the lower side to the higher side in the ventilation path can flow smoothly without hindrance. In other words, even if the gas is thermally expanded on the high-temperature side in the ventilation path and the apparent flow velocity is increased, the flow path cross-section is formed larger on the high-temperature side, so the resistance due to pressure loss in the high-temperature side ventilation path is increased. Therefore, the rise of the internal pressure can be suppressed, so that the permeated gas can flow smoothly from the low temperature side to the high temperature side without being hindered. As a result, the permeated gas can flow smoothly from the low-temperature side to the high-temperature side, and from the communication point between the first flow path and the second flow path connected to the ventilation path without increasing the power of the seal fan. Gas can be prevented from leaking into the heat exchanger room.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, each of the flow paths has a gap between the plurality of heat storage materials filled in the ventilation path. Therefore, the operation of forming the cross sections of the respective flow paths having different ventilation resistances is facilitated. In other words, for example, when a spherical heat storage material is filled in the ventilation path to form a gap between a plurality of heat storage materials, the heat storage material having a small diameter is compared to filling a heat storage material having a large diameter. Filling causes a large number of small gaps to be formed in the ventilation path, so that the total surface area of sliding contact of the permeated gas when passing through the gaps increases. As a result, the permeation resistance to the permeated gas increases. Therefore, by utilizing the above-described phenomenon, the airflow resistance can be adjusted by simply filling the space in the air passage with the heat storage materials having different diameters. The workability of the work of forming the road cross section can be improved.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, each of the flow paths may be provided between a plurality of heat storage material walls filled in the ventilation path. Since the heat storage material is formed by the formed space, each flow path having a different flow path cross section can be formed only by the forming operation of installing and forming the heat storage material in the ventilation path. That is, for example, when the heat storage material is installed and formed in the ventilation path, the distance between the heat storage material walls is set to be large on the high-temperature side and small on the low-temperature side. The cross section of the flow path can be made larger, and the cross section of the flow path can be made smaller as the temperature becomes lower. As a result, the flow path can be formed in accordance with the operation of installing the heat storage material, so that the workability of the flow path forming operation can be improved.

According to the fourth aspect of the present invention, in addition to the effects of the first aspect of the present invention, in addition to the above, each of the flow paths is formed with a communication hole formed in the heat storage material filled in the ventilation path. Therefore, the flow path can be formed only by the operation of installing the heat storage material. In other words, for example, when the heat storage material is formed of porous ceramics, simply install porous ceramics having larger communication holes toward the high temperature side in the ventilation path and install porous ceramics having smaller communication holes toward the lower temperature side. The larger the cross section of the flow path,
The lower the temperature, the smaller the cross section of the channel can be formed.
As a result, the workability of the flow path forming operation can be improved.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the thermal storage deodorizer has a combustion chamber 1 for burning odor components in a gas G to be treated and a plurality of ventilation passages 2a filled with a heat storage material 2C, which are arranged side by side in the circumferential direction. At the same time, of the plurality of ventilation passages 2a, an object that has been in an exhaust passage state in which heat is stored by allowing exhaust gas from the combustion chamber 1 to pass is in a gas-to-be-processed state, and is subjected to passage with the amount of heat stored by the exhaust g. Heat exchange provided with a heat storage body 2 that is configured to be rotatable around an axis P along an air passage 2a so that an object that has been in a gas passing state to preheat a processing gas G is in an exhaust gas passing state. 3A.

As shown in FIGS. 1 and 6, the first flow path 21
Is a gas supply port 6 (hereinafter referred to as a first supply duct) connected to a gas supply duct 5 for supplying a gas G to be processed from one end face side of the heat storage body 2 at a specific location in the circumferential direction. And a discharge duct 7 for discharging the gas G to be treated, which has passed through the heat storage body 2 on the other end face side, to the receiving port 1 a of the combustion chamber 1.
And a gas discharge port 8 (hereinafter referred to as a first discharge duct) connected to the gas discharge port. Further, the second flow path 22 is connected to an exhaust supply duct 9 that supplies the exhaust gas g discharged from the exhaust port 1b of the combustion chamber 1 to the regenerator 2 from the other end face at a specific location in the circumferential direction different from the above. Exhaust supply port 10 (hereinafter referred to as a second supply duct) and an exhaust discharge port 12 (hereinafter referred to as a second supply duct) connected at one end surface thereof to an exhaust duct 11 for exhausting the exhaust g passing through the heat storage body 2 to the outside. Discharge duct).

The gas seal is formed by a seal fan 24 which feeds the exhaust gas g in the discharge duct 11 into the heat exchanger chamber 3 through the recirculation duct 27 by the internal pressure in the first supply duct 6 and the first discharge duct 8. And the second supply duct 10 and the second
The internal pressure in the discharge duct 12 and the plurality of ventilation paths 2 filled with the heat storage material 2C in a state of communicating with the plurality of ducts.
By maintaining the internal pressure in the heat exchanger chamber 3 higher than the internal pressure in a, the gas G to be treated flows from inside the first supply duct 6 and the first discharge duct 8 to the heat exchanger from the communication point with the ventilation path 2a. Not to leak into the room 3
It is configured such that exhaust g from inside the supply duct 10 and the second discharge duct 12 does not leak into the heat exchanger chamber 3 from the communication point R with the ventilation path 2a. At this time, the pressure in the gas supply duct 5 on the low temperature side is detected by the pressure sensor AS,
10-50mm from the detected pressure by the controller SS
The seal pressure by the seal fan 24 is automatically controlled so as to increase Aq.

As shown in FIG. 6, the first supply duct 6
And both side walls 6a, 6b, 8 of the first discharge duct 8, respectively.
a, 8b and the end face of the heat storage body 2, the gas in the heat exchanger chamber 3 due to the difference between the pressure in the first supply duct 6 and the first discharge duct 8 and the pressure in the heat exchanger chamber 3. First supply duct 6
And a gap 13 permitting transfer into the first discharge duct 8,
14, both side wall portions 10a, 10b, 12 of the second supply duct 10 and the second discharge duct 12, respectively.
a, 12b and the end face of the heat storage body 2, the pressure in the second supply duct 10 and the second discharge duct 12 and the heat exchanger chamber 3
Gaps 15 and 16 are formed to allow the heat exchanger chamber gas to flow into the second supply duct 10 and the second discharge duct 12 due to the difference with the internal pressure. Incidentally, the gap 1 between the first supply duct 6 and the first discharge duct 8 and the end face of the heat storage body 2
Examples of real numerical values 3 and 14 are 0.1 to 0.5 mm, and real numerical examples of gaps 15 and 16 between the second supply duct 10 and the second discharge duct 12 and the end face of the heat storage body 2 are given. And 0.1 to 0.5 mm.

Each of the both side walls 6a, 6b, 8a, 8b of the first supply duct 6 and the first discharge duct 8 has a size to cover an end opening of one air passage 2a.
Sealing Cover Plates 17a, 17b, 18a, 18b
Are connected to each other, and both side walls 10a, 10b, 12a, of the second supply duct 10 and the second discharge duct 12 are provided.
12b, sealing cover plates 19a, 19b, 2 each having the size and shape to cover the end opening of one ventilation path 2a.
0a and 20b are continuously provided. The combustion chamber 1 is formed with a receiving port 1a for receiving the gas G to be treated and an exhaust port 1b for discharging the exhaust gas g. The odor component in the gas G to be treated received from the receiving port 1a is subjected to combustion processing. That is, a burner 1A for oxidative decomposition treatment is provided.

As shown in FIG. 1, the heat exchanger chamber 3 is formed with a second flow path 22 for discharging the exhaust gas g from the combustion chamber 1 to the outside, and is filled with a heat storage material 2C. Are formed in parallel with each other in the circumferential direction, and of the plurality of ventilation paths 2a, the exhaust gas g from the combustion chamber 1 is passed through the second flow path 22 so as to store heat. The object that has passed through the first passage 21 with the amount of heat stored by the exhaust g passes through the first passage 21, and the object that passed through the first passage 21 passes through the gas to be treated. So that the air passage 2a
The heat exchange unit 3A is configured by providing a heat storage unit 2C that is configured to be rotatable around the axis P along the axis.

As shown in FIGS. 2A and 2B, the heat storage body 2 is provided with a cylindrical main body 2A, and a plurality of partition walls which partition the inside of the main body 2A into a plurality of circumferential air passages 2a. 2B, and a structure in which a heat storage material 2C is filled in each ventilation path 2a, that is, a structure in which a plurality of ventilation paths 2a filled with the heat storage material 2C are formed side by side in the circumferential direction. Is installed rotatably around the axis P inside the heat exchanger room 3
It is driven by an external motor 4. As shown in FIG. 5, the heat storage material 2C is formed by bending a metal thin plate such as stainless steel or aluminum a plurality of times at a certain height to form a corrugated fin F above and below another fin F via a plate B. The fins F are formed by lamination. Then, as shown in FIG. 4, the heat storage material 2 </ b> C filled in the air passage 2 a close to the combustion chamber 1 side, that is, the high-temperature side, formed a large pitch between adjacent fins F formed in a series. On the other hand, as the heat storage material 2C to be charged into the low-temperature side remote from the combustion chamber 1, a pitch formed between adjacent fins F formed in a series and having a small pitch is used. The ends of both sides of the heat storage material 2C filled in the ventilation passage 2a partitioned by the partition 2B are, as shown in FIG.
Since it is formed in a state of being retracted inward from the cylindrical main body 2A, the opening of the ventilation path 2a is formed by the sealing cover plates 17a and 18a connected to the side walls of the first supply duct 6 and the first discharge duct, respectively. Is covered, it is possible to allow the gas to be processed G to pass through the entire ventilation path 2a if a part of the ventilation path 2a is open in the duct. (The same applies to the effects of the second supply duct 10 and the second discharge duct 12.) In this embodiment, the inside of the main body 2A is equally divided into 16 ventilation paths 2a.

Next, a description will be given along the flow of gas in the thermal storage type deodorizing device S. As shown in FIG.
Are a plurality of ventilation paths 2 provided in the heat storage body 2 from the first duct 6.
When passing through the gas passage 2a in the passage of the gas G to be treated, the gas a contacts the heat storage material 2C in the gas passage 2a via the receiving port 1a formed in the first discharge duct 8. It is discharged and supplied into the combustion chamber 1. At this time, since the temperature of the gas passage 2a closer to the combustion chamber becomes higher, the gas G to be processed undergoes thermal expansion and its apparent flow velocity becomes faster. However, the heat storage material 2C filled in the high temperature side in the gas passage 2a Uses a gas in which the pitch of the fins F is larger than that of the gas charged on the low-temperature side.
Even when thermal expansion occurs from the low-temperature side to the high-temperature side when passing through the inside, since the permeation flow path having a large fin pitch is formed, the gas G to be processed can be formed without pressure loss. It can flow smoothly toward the combustion chamber 1. (Refer to FIG. 4) Then, in order to burn out the odor component in the gas G to be treated in the combustion chamber 1, the odor component is heated by a burner 1 </ b> A in the combustion chamber 1, and is discharged through an exhaust port 1 b provided in the combustion chamber 1. When passing from the second supply duct 10 through the plurality of ventilation paths 2a provided in the heat storage body 2C, the heat is discharged from the second discharge duct 12 to the outside while contacting the heat storage material 2C in the ventilation path 2a.
At this time, the heat-treated exhaust g undergoes thermal expansion and has an apparent higher flow velocity. However, the heat storage material 2C filled in the high-temperature side in the ventilation path 2a is larger than that filled in the low-temperature side. Also, since the fins F having a large pitch are used, the exhaust g can flow toward the low temperature side without causing pressure loss. Further, at this time, since the heat in the exhaust gas is transmitted while being stored in the heat storage material 2C, the exhaust gas temperature decreases toward the lower temperature side, causing thermal contraction of the exhaust g, and the apparent flow velocity of the exhaust g decreases. Therefore, even when a material having a smaller fin pitch than a material having a large fin pitch, such as the heat storage material 2C filled on the high temperature side, is used, heat storage performance can be improved without causing pressure loss. By the way, when stainless steel is used as the metal forming the fin F, the fin F is excellent in heat resistance and durability. In consideration of cost and the like, stainless steel having excellent heat resistance and durability may be used on the high temperature side, and inexpensive aluminum may be used on the low temperature side.

The exhaust g from the combustion chamber 1 is supplied to the second passage 22
When passing through the first passage 21, heat is stored in the heat storage material 2C in the ventilation passage 2a, and when the gas G to be supplied to the combustion chamber 1 is passed through the ventilation passage 2a through the first flow passage 21. The object that has been in the exhaust gas passage state is now in the gas passage state, and the object that has been in the gas passage state is in the exhaust gas passage state so that the gas G to be treated can be preheated with the heat stored from the exhaust g. The heat storage body 2 is configured to be rotatable around the rotation axis P.

By the way, an example of the real value of the temperature is as follows.
The temperature of the gas G to be treated in the supply duct 6 is 160 ° C., the temperature of the gas G to be treated in the first discharge duct 8 that receives the gas G to be treated heated by the heat storage unit 2 is 670 ° C., and the temperature of the second gas after combustion is The exhaust temperature in the supply duct 10 is 760 ° C., and the second exhaust duct 1 that receives the exhaust g after heating the heat storage body 2
The temperature of the exhaust g at 2 is 300 ° C. [Another Embodiment] Another embodiment will be described below. <1> The heat storage material is not limited to the configuration in which the size of the cross section of each flow channel is changed by changing the pitch of the fins described in the above embodiment. For example, as shown in FIG. Is filled with a large-diameter spherical heat storage material 2C in the high-temperature side ventilation path 2a, and the low-temperature side ventilation path 2a
It may be filled with a spherical heat storage material 2C having a small diameter. In other words, the gap formed when the heat storage material 2C having a large diameter is filled becomes large, and the gap formed when the heat storage material 2C having a small diameter is filled becomes small, so that the gap has a different diameter. Heat storage material 2
It is possible to form gaps of different sizes only by filling the space in the ventilation path 2a with C, and it is possible to improve the workability of forming the cross section of each flow path 2D in the ventilation path 2a. The shape of the heat storage material is not limited to a spherical shape, and is arbitrary. That is, the size of the gap formed at the time of filling may be any shape as long as a gap of an arbitrary size is formed only by filling the heat storage material. <2> The formation of each flow path is not limited to the above configuration. For example, as shown in FIG.
When a plurality of plate-shaped heat storage material walls 2E (an example of a heat storage material) are installed and formed in a, the distance between the heat storage material walls 2E is increased on the higher temperature side, and the heat storage material walls 2E on the lower temperature side. The flow path 2D may be formed by reducing the distance between the walls. In this case, heat storage material 2C
With the installation work, the flow path can be formed to have a larger cross section on the higher temperature side and smaller on the lower temperature side, so that the workability of the flow path forming operation can be improved. Now you can. <3> The formation of each flow path is not limited to the above-described configuration. For example, as shown in FIG.
C is a ceramic 2G having a communication hole 2F having a different size.
(An example of a heat storage material) may be used. In this case, the porous ceramics 2G having the larger communication holes 2F are installed on the higher temperature side of the ventilation passage 2a, and the cross section of the flow channel is increased on the higher temperature side by merely installing the porous ceramics 2G having the smaller communication holes on the lower temperature side. In addition, the lower the temperature, the smaller the cross section of the flow path can be formed, so that the workability of the flow path forming operation can be improved. <4> The formation of each flow path is not limited to the above-described configuration. For example, as shown in FIG. 7D, metal or ceramic pipes having different diameters (an example of a heat storage material) May be used. That is, the pipe 2H having a larger diameter is filled in a plurality of stages in the direction of the axis P on the higher temperature side, and the pipe 2H having a smaller diameter is filled in a plurality of stages in the direction of the axis P on the lower side. The flow path cross-section can be made smaller as the temperature increases, and the workability of the flow path forming operation can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional side view showing a heat storage type deodorizing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a heat storage material according to one embodiment of the present invention.

FIG. 3 is a longitudinal sectional front view showing a heat storage body according to an embodiment of the present invention.

FIG. 4 is a longitudinal sectional side view showing a main part of a heat storage body according to one embodiment of the present invention.

FIG. 5 is a developed cross-sectional view showing a heat storage body according to one embodiment of the present invention.

FIG. 6 is a developed sectional view showing a heat storage type deodorizing apparatus according to an embodiment of the present invention.

FIG. 7 is a longitudinal sectional side view showing a main part of a heat storage body according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion chamber 2a Ventilation path 2C Heat storage material 2E Heat storage material wall 2F Communication hole 3A Heat exchange part G Gas to be treated g Exhaust P Rotary shaft core

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Osamu Onishi, Osaka Gas Engineering Co., Ltd. 1-4-2 Nakamichi, Higashinari-ku, Osaka, Osaka Prefecture (72) Inventor Takayoshi Komine Shimbashi-cho, Izumi-ku, Yokohama-shi, Kanagawa 1029 No. 19 (72) Inventor Masami Ohara 446 No. 11 Nishikubo, Shimizu-shi, Shizuoka F-term (reference) 3K078 BA17 EA02 EA06 EA07 EA09 4D002 AB03 AC10 BA05 CA05 HA08

Claims (4)

[Claims] 1. A combustion chamber for combusting an odor component in a gas to be treated is provided, a plurality of ventilation paths filled with a heat storage material are formed side by side in a circumferential direction, and among the plurality of ventilation paths, The object that was in the exhaust gas passing state in which heat is stored by passing the exhaust gas becomes the gas to be processed state, and the object that was in the gas passing state in which the gas to be passed is preheated by the amount of heat stored by the exhaust gas. A heat storage type deodorizing device, comprising: a heat storage body that is configured to be rotatable and rotatable around an axis along the ventilation path such that the heat storage device is in an exhaust passage state; A heat storage type deodorizing device, wherein the cross section of each flow path in an air passage filled with a material is formed such that the cross section of the flow path becomes larger as the temperature becomes higher. 2. The heat storage type deodorizing device according to claim 1, wherein each of the flow paths is formed by a gap between a plurality of heat storage materials filled in the ventilation path. 3. The heat storage type deodorizing device according to claim 1, wherein each of the flow paths is formed by a space formed between a plurality of heat storage material walls filled in the ventilation path. 4. The heat storage type deodorizing device according to claim 1, wherein each of the flow paths is formed by a communication hole formed in a heat storage material filled in the ventilation path.