JP2000139631A - Show case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a show case device capable of freely selecting heat insulation and cold insulation, taking out food in the case from both sides of the show case and storing the same, small-sized and suitable for moving installation. SOLUTION: This show case device comprises a placing plate 2 disposed on the upper surface of the device main body 1, having thermal conductivity, a temperature control device 4 for cooling or heating the placing plate 2 at a fixed temperature, and a transparent cover member 3 covering the upper part of the device main body 1. The cover member 3 comprises a front cover 30 and a rear cover 40, with one cover turnably connected to the other cover to each other. The covers can be opened and closed from the front and the rear of the device main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a showcase apparatus for keeping food warm or cool.

[0002]

2. Description of the Related Art Conventionally, various showcase devices have been proposed and put to practical use. These showcase devices are used for keeping food so that it does not cool down, or for keeping foods cold so that they do not warm up, and for customers to temporarily view food, Sales representatives and cooks take out the products from the showcase as required by the customer.

[0003]

However, in a conventional showcase apparatus, a salesperson or a cook can take out food, but cannot take it out by a customer. This meant that customers could keep food safe by preventing them from taking it out of the showcase.However, in systems such as buffet dishes where customers can freely select and take out food, the conventional show The case could not cope with the problem, and the cooling device and the heating device were internally provided, so that the entire device became large and could not be easily moved and installed.

[0004] The present invention solves the above-mentioned problems, and allows the user to freely select warming and cooling. The present invention is compact and optimal for mobile installation, and takes out food in the case from both sides of the showcase.
An object of the present invention is to provide a showcase device that can be stored.

[0005]

In order to solve the above-mentioned problems, a showcase apparatus according to the present invention comprises a mounting plate disposed on an upper surface of an apparatus main body and having thermal conductivity, and the mounting plate having a constant temperature. And a transparent cover member for covering the upper part of the device main body. The cover member includes a front cover and a rear cover, and one cover is opposed to the other cover. The apparatus is characterized in that it is rotatably connected and can be opened and closed from the front and rear of the apparatus main body.

The cover member may be detachable, and the cover member may be once removed when the article is placed on the placing plate, and the cover may be attached again after placing the article.

A fitting portion for fitting the lower edge of the cover member is formed inside the peripheral edge of the apparatus main body, so that air can be prevented from entering and exiting from the lower end of the cover member and the cover member can be prevented from being displaced. It may be.

The temperature control device includes a Peltier device, a changeover switch for switching a direction of a current applied to the Peltier device, a temperature sensor for detecting a temperature of the mounting plate, and a temperature sensor based on a detection result of the temperature sensor. Control means for controlling the supply of power to the Peltier element,
It is preferable to reduce the size and weight of the entire device, to make it easy to carry, and not to be restricted by the place of use.

[0009]

FIG. 1 shows a showcase device according to the present invention. The showcase device has a box-shaped device main body 1 and a heat-conductive mounting member disposed on the upper surface of the device main body 1. It comprises a mounting plate 2, a cover member 3 provided to cover the mounting plate 2, and a temperature control device 4 for heating or cooling the mounting plate 2. It is intended to keep the food placed on it at a constant temperature or cool to supply the food in an optimal state, and to be able to store and take out the food from both front and rear of the device.

As shown in FIG. 2, the apparatus main body 1 is formed in a hollow stainless steel box shape having a hollow upper surface opened.
At least at four corners of the bottom surface, a space is formed by floating the apparatus main body 1 from the installation surface a, and leg portions 10 are provided for air circulation. Slits for suctioning and discharging air are provided on the side and bottom surfaces. A fan 12 is mounted inside the slit 11 so as to cool the inside of the apparatus main body 1 with air sucked from below the apparatus main body 1 and discharge the cooled air from the side. I have.

A dial 13 for setting a temperature and a switch 14 for switching between hot and cold are arranged on the front of the apparatus main body 1.

The mounting plate 2 is made of a metal plate having excellent heat conductivity. In the present invention, the mounting plate 2 is made of an aluminum plate having a thickness of about 3 mm, and is formed in a flat rectangular dish shape with four sides standing. A Peltier device 20 that generates or absorbs heat by changing the direction of the Peltier device is attached. A heat insulating material 21 is attached to portions other than the Peltier device 20, and an aluminum plate 22 is further attached to the surface of the heat insulating material 21. Is being worn. Note that a heat sink 23 is attached to the lower surface of the Peltier device 20, and when the lower surface of the Peltier device 20 generates heat (when the mounting plate 2 is cooled), the heat is radiated. This heat sink 2
Numeral 3 efficiently cools the Peltier element 20 by the air blown by the fan 12 described above.

The cover member 3 is composed of a front cover 30 and a rear cover 40 formed of a transparent acrylic resin, and the front cover 30 and the rear cover 40 are respectively curved front plates 30.
a, 40a and two semicircular side plates 30b, 40b. The cover member 3 is attached to a fitting portion 15 formed by an upper edge 1a of the apparatus main body 1 and an upright edge 2a of the mounting plate 2. The lower end is fitted, and is arranged to face the upper surface of the apparatus main body 1.
A handle 16 is attached near the center lower end of each of the front plates 30a and 40a so that an opening and closing operation can be performed. Further, as shown in FIG. 3A, the radius of the side plate of the front cover 30 is formed to be smaller than the radius of the side plate of the rear cover 40, and a part of the side plate is overlapped, and the lower ends of the overlapped parts are rotated with each other. Is supported by the support shaft 17 as much as possible, and the front cover 30
When the front cover 30 is opened, the front cover 30 pivots so as to overlap the inside of the rear cover 40. When the rear cover 40 is opened, the rear cover 40 pivots so as to cover the outside of the front cover 30. When the handle 30 is opened, the handle 16 is
The handle 16 also serves as a limiter for the amount of rotation of the front cover 30 so that the front cover 30 is not completely stored inside the rear cover 40. FIG.
As shown in (a), the front cover 30 'and the rear cover 40'
Are composed of front plates 30a ', 40a' bent with hooks and rectangular side plates 30b ', 40b'. When one cover is opened, the top plate of the other cover is the top plate of the other cover. (See FIG. 4B).

As shown in FIG. 5, the temperature control device 4 includes a power supply unit 25 for converting a commercial power supply into a DC voltage, a Peltier device 20 for generating and absorbing heat by changing the direction of a current, and a Peltier device 20 for the Peltier device. A changeover switch 14 (14a, 14b) for switching the direction of the current applied to the element 20, a temperature sensor 27 for detecting the temperature of the mounting plate 2, and an electric power to the Peltier element 20 according to the temperature detected by the temperature sensor. And control means 28 for controlling the supply.
In the present invention, a bimetal is used as a temperature sensor, and the switch (relay) 29 operates at a set temperature.

The fan 12 is controlled so as to be turned ON / OFF in conjunction with the changeover switches 14a and 14b.
The fan 12 is connected so as to operate only when the lower surface of the Peltier element 20 generates heat (when the mounting plate 2 is cooled).

The switch 14c of the fan 12 and the switches 14a and 14b of the Peltier device 20 are switched in conjunction with the three switches so that the fan 12 can be activated and stopped in conjunction with the switching of the current of the Peltier device 20. Should be used. Further, a thermistor or a thermocouple may be used as the temperature sensor, and a microcomputer may be used as the control means.

According to the showcase device having the above-described structure, when used as a showcase device for keeping cool, the dial 13 is turned to set the temperature, and the changeover switch 14a is set so that the upper surface of the Peltier element 20 absorbs heat. , 14b,
Set as shown in FIG. At this time, the Peltier element 2
Since the lower surface of 0 generates heat, the switch 14c of the fan 12 is also turned on in conjunction therewith. Power switch 26
Is turned on, and when the temperature sensor 27 detects that the temperature of the mounting plate 2 has dropped to the predetermined temperature, the control means 28 activates the switch 29 to cut off the supply of power to the Peltier element 20, and the temperature reaches the predetermined temperature. If not, supply of power is continued. At this time, the fan 12 is also operated, the heat radiation of the heat sink 23 is promoted, and the control device is operated so that the temperature of the mounting plate 2 is maintained at the set temperature. When the mounting plate 2 is to be warmed, the changeover switch 14 may be set at a position opposite to that in FIG. 5 to reverse the direction of the current flowing through the Peltier device 20. At this time, the heat sink 23 is cooled by the Peltier device 20, so that the switch 14
c is turned off, and the operation of the fan 12 is stopped.

Since the cover member 3 can be opened and closed from both the front and the rear of the apparatus main body 1, the food b is supplied from the front side as shown in FIG. 3B, and as shown in FIG. In addition, since the food b can be taken out from the opposite side, there is no need for the person supplying the food to take out the food and hand it over to the customer, and the customer can freely take out the food he or she likes, such as a buffet dish. As described above, in the case of a system in which the replenishment of food is always required and the customer can take it out freely, an optimum showcase device can be provided. Further, unlike the case of the sliding door, the food can be stored while being placed on a large tray, and unlike the side-opening door, the door opened on the front side does not interfere.

Further, since the cover member 3 is removably mounted on the apparatus main body 1, as shown in FIG. 6, the cover member 3 is once removed, food is placed on the mounting plate 2, and thereafter the cover member 3 is placed. 3 can be attached, and when a large tray or food is placed, the cover member 3 can be placed easily without worrying about the cover member 3.

A fitting portion 15 is provided between the mounting plate 2 and the apparatus main body 1, and a lower end edge of the cover member 3 is attached to the fitting portion 15.
(See FIG. 2), the degree of sealing is increased, and the mounting position of the cover member 3 with respect to the apparatus main body 1 does not shift even when the cover is opened and closed somewhat violently.

In the above-described showcase apparatus, the Peltier element is directly mounted on the back surface of the mounting plate. However, as shown in FIG. 7, a panel 51 provided with a copper pipe 50 having high thermal conductivity is mounted. A pump 52 mounted on the back of the plate and circulating propylene glycol as a heat medium in the pipe 50, a Peltier device 20 for cooling or heating the heat medium returned from the panel 51, and air sucked from an air inlet 53 Alternatively, the temperature of the mounting plate may be controlled by the heat exchange unit 54 provided with the fan 12 for cooling the Peltier element 20. Also in this case, it is needless to say that the heat medium can be cooled or heated by switching the direction of the current flowing through the Peltier element, and the same is true when the fan 12 rotates when the heat medium is cooled. is there. According to the above-described panel, the temperature of the entire surface of the mounting plate can be made uniform. Then, the upper surface of the panel 51 may be used instead of the mounting plate. In FIG. 7, reference numeral 55 denotes a pipe that sends a heat medium from the heat exchange unit 54 to the pump 55, 56 denotes a pipe that sends a heat medium from the pump 55 to the panel 51, and 57 denotes a pipe that passes from the panel 51 to the heat exchange unit 54.
Pipe to return the heat medium to the pipe.

[0022]

According to the first aspect of the present invention, articles that need to be kept warm and cool in the showcase apparatus can be taken in and out of the front and rear of the apparatus body, so that the showcase apparatus excellent in handling can be obtained. Can be provided.

According to the second aspect of the present invention, after the cover member is once removed, the article to be kept warm or cold can be placed on the placing plate, and then the cover member can be attached. It can be put in and out without worrying about the cover member.

According to the third aspect of the present invention, since the lower edge of the cover member is fitted to the fitting portion, the degree of sealing is increased, and the cover member is displaced even if the cover is opened and closed somewhat violently. According to the fourth aspect of the present invention,
The size of the apparatus can be reduced, and the cooling / heating can be easily switched by a changeover switch, so that a showcase apparatus excellent in handling at the time of transportation and installation can be realized.

[0025]

[Brief description of the drawings]

FIG. 1 is a perspective view of a showcase device according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the showcase device.

FIGS. 3A to 3C are longitudinal cross-sectional views of a main part illustrating a configuration and an operation state of a cover member.

FIGS. 4 (a) and 4 (b) are longitudinal cross-sectional views of a main part illustrating a configuration and an operation state of a showcase device of another example.

FIG. 5 is an electric circuit diagram of the showcase device.

FIG. 6 is a perspective view illustrating a use state of the showcase device.

FIG. 7 is a perspective view illustrating another example of the showcase device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device main body 2 Mounting plate 3 Cover member 4 Temperature control device 15 Fitting part 20 Peltier element 27 Temperature sensor 28 Control means 30 Front cover 40 Rear cover

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 31, 1999 (1999.8.3)
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Showcase device

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a showcase apparatus for keeping food warm or cool.

[0002]

2. Description of the Related Art Conventionally, various showcase devices have been proposed and put to practical use. These showcase devices are used for keeping food so that it does not cool down, or for keeping foods cold so that they do not warm up, and for customers to temporarily view food, Sales representatives and cooks take out the products from the showcase as required by the customer.

[0003]

However, in a conventional showcase apparatus, a salesperson or a cook can take out food, but cannot take it out by a customer. This meant that customers could keep food safe by preventing them from taking it out of the showcase.However, in systems such as buffet dishes where customers can freely select and take out food, the conventional show The case could not cope with the problem, and the cooling device and the heating device were internally provided, so that the entire device became large and could not be easily moved and installed.

[0004] The present invention solves the above-mentioned problems, and allows the user to freely select warming and cooling. The present invention is compact and optimal for mobile installation, and takes out food in the case from both sides of the showcase.
An object of the present invention is to provide a showcase device that can be stored.

[0005]

In order to solve the above-mentioned problems, a showcase apparatus according to the present invention comprises a mounting plate disposed on an upper surface of an apparatus main body and having thermal conductivity, and a back surface of the mounting plate.
Cool or heat the mounting plate at a certain temperature
And a power supply for supplying power to the Peltier element.
Switch the direction of the current applied to the source and Peltier device
Switch, and a transparent cover member that covers the top surface of the apparatus main body, the cover member includes a front cover and a rear cover, and the other cover is rotatably connected to one cover, It is characterized in that it can be opened and closed from the front and rear of the apparatus main body.

[0006]

FIG. 1 shows a showcase device according to the present invention. The showcase device has a box-shaped device main body 1 and a heat-conductive mounting member disposed on the upper surface of the device main body 1. It comprises a mounting plate 2, a cover member 3 provided to cover the mounting plate 2, and a temperature control device 4 for heating or cooling the mounting plate 2. It is intended to keep the food placed on it at a constant temperature or cool to supply the food in an optimal state, and to be able to store and take out the food from both front and rear of the device.

As shown in FIG. 2, the apparatus main body 1 is formed in a hollow stainless steel box shape having a hollow upper surface and an opening.
At least at four corners of the bottom surface, a space is formed by floating the apparatus main body 1 from the installation surface a, and leg portions 10 are provided for air circulation. Slits for suctioning and discharging air are provided on the side and bottom surfaces. A fan 12 is mounted inside the slit 11 so as to cool the inside of the apparatus main body 1 with air sucked from below the apparatus main body 1 and discharge the cooled air from the side. I have.

[0008] Then, a dial 13 for the temperature setting on the front surface of the apparatus body 1, the change-over switch 1 of the temperature cold cut instead ← for
4 are arranged.

The mounting plate 2 is made of a metal plate having excellent heat conductivity. In the present invention, the mounting plate 2 is made of an aluminum plate having a thickness of about 3 mm, and is formed in a flat rectangular dish shape with four sides standing. A Peltier device 20 that generates or absorbs heat by changing the direction of the Peltier device is attached. A heat insulating material 21 is attached to portions other than the Peltier device 20, and an aluminum plate 22 is further attached to the surface of the heat insulating material 21. Is being worn. Note that a heat sink 23 is attached to the lower surface of the Peltier device 20, and when the lower surface of the Peltier device 20 generates heat (when the mounting plate 2 is cooled), the heat is radiated. This heat sink 2
Numeral 3 efficiently cools the Peltier element 20 by the air blown by the fan 12 described above.

The cover member 3 is composed of a front cover 30 and a rear cover 40 formed of a transparent acrylic resin.
a, 40a and two semicircular side plates 30b, 40b. The cover member 3 is attached to a fitting portion 15 formed by an upper edge 1a of the apparatus main body 1 and an upright edge 2a of the mounting plate 2. The lower end is fitted, and is arranged to face the upper surface of the apparatus main body 1.
A handle 16 is attached near the lower end of the center of each of the front plates 30a and 40a so that an opening and closing operation can be performed. Further, as shown in FIG. 3A, the radius of the side plate of the front cover 30 is formed to be smaller than the radius of the side plate of the rear cover 40, and a part of the side plate is overlapped, and the lower ends of the overlapped parts are rotated with each other. Is supported by the support shaft 17 as much as possible and the front cover 30
When the front cover 30 is opened, the front cover 30 pivots so as to overlap the inside of the rear cover 40. When the rear cover 40 is opened, the rear cover 40 pivots so as to cover the outside of the front cover 30. When the handle 30 is opened, the handle 16 is
The handle 16 also serves as a limiter for the amount of rotation of the front cover 30 so that the front cover 30 is not completely stored inside the rear cover 40. FIG.
As shown in (a), the front cover 30 'and the rear cover 40'
Are composed of front plates 30a ', 40a' bent with hooks and rectangular side plates 30b ', 40b'. When one cover is opened, the top plate of the other cover is the top plate of the other cover. (See FIG. 4B).

As shown in FIG. 5, the temperature control device 4 includes a power supply unit 25 for converting a commercial power supply to a DC voltage, a Peltier device 20 for generating and absorbing heat by changing the direction of a current, and a Peltier device 20 for the Peltier device. A changeover switch 14 (14a, 14b) for switching the direction of the current applied to the element 20, a temperature sensor 27 for detecting the temperature of the mounting plate 2, and an electric power to the Peltier element 20 according to the temperature detected by the temperature sensor. And control means 28 for controlling the supply.
In the present invention, a bimetal is used as a temperature sensor, and the switch (relay) 29 operates at a set temperature.

The fan 12 is controlled to be turned on / off in conjunction with the changeover switches 14a and 14b.
The fan 12 is connected so as to operate only when the lower surface of the Peltier element 20 generates heat (when the mounting plate 2 is cooled).

[0013] Incidentally, the switching Sui <br/> pitch 14a of the switch 14c and the Peltier elements 20 of the fan 12 as in conjunction with the switching of the current in the Peltier element 20 may operate and stop the fan 12, interlocking the 14b What is necessary is just to use a triple switch which switches. Further, a thermistor or a thermocouple may be used as the temperature sensor, and a microcomputer may be used as the control means.

According to the showcase apparatus having the above structure, when used as a showcase apparatus for cold sets the temperature by turning the dial 13, the changeover switch 14a so that the upper surface of the Peltier element 20 absorbs heat , 14b,
The settings are made as shown in FIG. At this time, the Peltier element 2
Since the lower surface of 0 generates heat, the switch 14c of the fan 12 is also turned on in conjunction therewith. Power switch 26
Is turned on, and when the temperature sensor 27 detects that the temperature of the mounting plate 2 has dropped to the predetermined temperature, the control means 28 activates the switch 29 to cut off the supply of power to the Peltier element 20, and the temperature reaches the predetermined temperature. If not, supply of power is continued. At this time, the fan 12 is also operated, the heat radiation of the heat sink 23 is promoted, and the control device is operated so that the temperature of the mounting plate 2 is maintained at the set temperature. When the mounting plate 2 is to be warmed, the changeover switch 14 may be set at a position opposite to that in FIG. 5 to reverse the direction of the current flowing through the Peltier device 20. At this time, the heat sink 23 is cooled by the Peltier device 20, so that the switch 14
c is turned off, and the operation of the fan 12 is stopped.

Since the cover member 3 can be opened and closed from both front and rear sides of the apparatus main body 1, the food b is supplied from the front side as shown in FIG. 3B, and as shown in FIG. 3C. In addition, since the food b can be taken out from the opposite side, there is no need for the person supplying the food to take out the food and hand it over to the customer, and the customer can freely take out the food he or she likes, such as a buffet dish. As described above, in the case of a system in which the replenishment of food is always required and the customer can take it out freely, an optimum showcase device can be provided. Further, unlike the case of the sliding door, the food can be stored while being placed on a large tray, and unlike the side-opening door, the door opened on the front side does not interfere.

Further , since the cover member 3 is removably mounted on the apparatus main body 1, as shown in FIG. 6, the cover member 3 is once removed, food is placed on the mounting plate 2, and thereafter the cover member 3 is placed. 3 can be attached, and when a large tray or food is placed, the cover member 3 can be placed easily without worrying about the cover member 3.

A fitting portion 15 is provided between the mounting plate 2 and the apparatus main body 1, and a lower end edge of the cover member 3 is attached to the fitting portion 15.
(See FIG. 2), the degree of sealing is increased, and the mounting position of the cover member 3 with respect to the apparatus main body 1 does not shift even when the cover is opened and closed somewhat violently.

In the above-described showcase apparatus, the Peltier element is directly mounted on the back surface of the mounting plate. However, as shown in FIG. 7, a panel 51 provided with a copper pipe 50 having high thermal conductivity is mounted. A pump 52 mounted on the back of the plate and circulating propylene glycol as a heat medium in the pipe 50, a Peltier device 20 for cooling or heating the heat medium returned from the panel 51, and air sucked from an air inlet 53 Alternatively, the temperature of the mounting plate may be controlled by the heat exchange unit 54 provided with the fan 12 for cooling the Peltier element 20. Also in this case, it is needless to say that the heat medium can be cooled or heated by switching the direction of the current flowing through the Peltier element, and the same is true when the fan 12 rotates when the heat medium is cooled. is there. According to the above-described panel, the temperature of the entire surface of the mounting plate can be made uniform. Then, the upper surface of the panel 51 may be used instead of the mounting plate. In FIG. 7, reference numeral 55 denotes a pipe that sends a heat medium from the heat exchange unit 54 to the pump 55, 56 denotes a pipe that sends a heat medium from the pump 55 to the panel 51, and 57 denotes a pipe that sends the heat medium from the panel 51 to the heat exchange unit 54.
Pipe to return the heat medium to the pipe.

[0019]

According to the first aspect of the present invention, it has heat conduction.
The Peltier element was attached directly to the mounting plate
If you can easily switch the insulation with the changeover switch
In both cases, the size of the equipment can be reduced, and handling during transport and installation is easy.
And an excellent showcase device can be realized. Ma
Was, because the loading and unloading of goods that must be or cold or warm in the showcase apparatus can be from either the front and rear of the main body of the apparatus, such as such as smorgasbord, always food
System that needs to be replenished and can be taken out freely by customers.
In the case of a system, an optimum showcase device can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a showcase device according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the showcase device.

FIGS. 3A to 3C are longitudinal cross-sectional views of a main part illustrating a configuration and an operation state of a cover member.

FIGS. 4 (a) and 4 (b) are longitudinal cross-sectional views of a main part illustrating a configuration and an operation state of a showcase device of another example.

FIG. 5 is an electric circuit diagram of the showcase device.

FIG. 6 is a perspective view illustrating a use state of the showcase device.

FIG. 7 is a perspective view illustrating another example of the showcase device.

[Description of Signs] 1 Apparatus main body 2 Mounting plate 3 Cover member14 Changeover switch  20 Peltier element25 Power supply section  30 Front cover 40 Rear cover

Claims (4)

[Claims] 1. A mounting plate having thermal conductivity disposed on an upper surface of an apparatus main body, a temperature control device for cooling or heating the mounting plate at a constant temperature, and a transparent cover for covering an upper part of the apparatus main body. A cover member, wherein the cover member includes a front cover and a rear cover, and the other cover is rotatably connected to one of the covers, and can be opened and closed from the front and rear of the apparatus main body. A showcase device characterized by the above-mentioned. 2. The showcase device according to claim 1, wherein the cover member is detachably mounted on an upper surface of the device main body. 3. The showcase device according to claim 1, wherein a fitting portion for fitting a lower edge of the cover member is formed inside a peripheral edge of the device main body. 4. A Peltier device, wherein the temperature control device switches a direction of a current applied to the Peltier device, a temperature sensor for detecting a temperature of the mounting plate,
The showcase device according to claim 1, further comprising control means for controlling supply of electric power to the Peltier element based on a detection result of the temperature sensor.