JP2006010215A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of restraining moisture of frozen food from sublimating with a simple structure, while optimally freezing and preserving the frozen food. <P>SOLUTION: A quick cold accumulating plate 30 is installed in an opening part 16a of a storage vessel 16 stored in a freezing room, and cuts off a substantially half of the innermost part of the opening part 16a. This quick cold accumulating plate 30 is formed of aluminum, and can substantially uniformly cool the frozen food in the storage vessel 16 so that a temperature difference between the frozen food and a storage bag does not become large, by weakening force of cold air blown to the storage vessel 16 by once receiving the cold air blown to the storage vessel 16, to thereby prevent a continuance of sublimation of the moisture from the frozen food due to being large in the temperature difference between the frozen food and the storage bag, and the deterioration in an eating feeling can be prevented by preventing a drying-up feeling when cooking the frozen food. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerator provided with a box-shaped storage container that is housed in a freezing compartment and in which cool air from an evaporator is blown into an inside through an opening on an upper surface.

For example, as an open-open type freezer storage, one having an inner lid made of expanded polystyrene or the like in addition to an outer lid is provided. This type of inner lid is mainly used in a low-temperature type freezer storage, and is intended to save energy by suppressing the escape of cold air in the warehouse and suppressing the rise in the interior temperature.
In addition, as an invention for suppressing the rise in the internal temperature in this manner, as disclosed in Patent Document 1, an apparatus provided with a cold storage material on the inner surface of the outer lid (on the inner lid) and the inner wall of the storage has been proposed. Yes.
Japanese Patent Laid-Open No. 9-303931

However, when using an inner lid such as styrene foam, the escape of cold air can be suppressed by providing a lid, but once the temperature in the warehouse rises, the temperature inside the warehouse does not fall easily due to the thermal insulation of the lid, It could not be said that the composition was optimal for the preservation of food.
In addition, in the case where a cool storage material is provided on the inner lid and on the inner wall, the temperature stability in the warehouse is improved by the effect of the cool storage material, but using the cool storage material makes the whole heavy or stored in the warehouse. There are problems such as a decrease in volume.

  By the way, the storage container accommodated in the freezer compartment of the refrigerator is not provided with an inner lid such as styrene foam and is not provided with a cold storage material, and furthermore, extremely low temperature cold air (for example, −30 ° C.) is directly applied to the food from the evaporator. Since it is the structure which blows, there exists a problem that when a frozen food is cooked and eaten, much food will sublimate and a food texture will deteriorate greatly when frozen food is sublimated.

  This invention is made | formed in view of the said situation, The objective provides the refrigerator which can suppress that the water | moisture content of frozen food sublimates with a simple structure, storing frozen food optimally. There is.

The present invention relates to a refrigerator having a box-shaped storage container that is housed in a freezing compartment and in which cold air from an evaporator is blown into the inside through an opening on the upper surface. A non-sealing lid having thermal conductivity is provided to block the cool air from the vessel from being directly blown into the interior through the opening of the storage container (Claim 1).
In the above configuration, the lid body may be provided so that a part or all of the opening of the storage container can be opened and closed by sliding the upper surface of the storage container.

Moreover, the said cover body may be provided so that opening or closing of a part or all of the opening part of the said storage container is possible by bend | folding in the depth direction (Claim 3).
Moreover, the said cover body may be formed smaller than the inner shape of the said storage container, and may be mounted on the foodstuff accommodated in the said storage container (Claim 4).
The storage container may have a sub-storage chamber, and the lid may be provided so as to block cold air blown to the sub-storage container (Claim 5).

Moreover, the switching chamber which can switch cooling temperature is provided, and the said freezing compartment may be the said switching chamber (Claim 6).
Moreover, it is desirable that the thermal conductivity of the lid body be higher than 0.2 W / (m · K).

According to the present invention, the cold air from the evaporator is not directly blown to the frozen food stored in the storage container by the non-sealing lid body, and the momentum of the cold air is greatly reduced by the lid body. Therefore, the temperature in the storage container can be made almost uniform. In this case, since the lid has thermal conductivity, the inside of the storage container can be efficiently cooled by radiation of the lid.
Since the temperature in the storage container can be made uniform in this way, the temperature difference between the frozen food packaged in the storage bag and the storage bag is reduced, and the movement of moisture due to the temperature difference is eliminated. The sublimation of moisture can be suppressed. Thereby, when frozen food is cooked, it is possible to prevent the texture from getting worse.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 2 is a cross-sectional view schematically showing the configuration of the bottom freezer type refrigerator main body 1. In FIG. 2, the refrigerator main body 1 includes a refrigerator room 3, a vegetable room 4, a switching room 5, a freezing room (corresponding to a freezing compartment) in order from the top in a vertically-long rectangular box-shaped heat insulating box 2 having an open front. 6, and each of the storage chambers 3 to 6 is closed by a hinged refrigerated compartment door 7, a drawer-type vegetable compartment door 8, a switching compartment door 9, and a freezer compartment door 10. Yes. Although not shown in FIG. 2, an ice making freezer compartment is provided alongside the switching chamber 5 and is closed by an ice making ice compartment door.

The refrigerator compartment 3 and the vegetable compartment 4 are partitioned up and down by a partition plate 11, and a vegetable storage container 12 connected to the back side of the vegetable compartment door 8 is accommodated in the vegetable compartment 4 so as to be put in and out. Yes.
The vegetable compartment 4, the switching chamber 5, and an ice making freezer compartment (not shown) are vertically partitioned by a heat insulating partition wall 13 provided integrally with the heat insulating box 2.
The switching chamber 5 and the ice making freezer compartment and the freezing compartment 6 are vertically partitioned by a heat insulating partition wall 14, and the switching chamber 5 and the ice making freezer compartment are also partitioned left and right by a heat insulating partition wall (not shown). Thus, the switching chamber 5 is configured in a spatially and thermally independent form from the other chambers. A storage container 15 connected to the back side of the switching chamber door 9 is accommodated in the switching chamber 5 so that it can be put in and out.
In the freezer compartment 6, the storage container 16 connected with the back surface side of the freezer compartment door 10 is accommodated so that insertion / extraction is possible.

  On the other hand, as shown in FIG. 2, a refrigeration cycle device 17 is incorporated in the back surface of the refrigerator body 1. In other words, a refrigerator room evaporator (hereinafter referred to as R-evaporation room) 18 is formed on the back side of the vegetable room 4, and the refrigerating room constituting the refrigeration cycle apparatus 17 is formed in the R-evaporation room 18. An evaporator (hereinafter referred to as R-eva) 19 is provided, and an air-conditioning fan (hereinafter referred to as R-room fan) 20 that can be driven at a variable speed (for example, 1800 to 2400 rpm) is provided above the evaporator. ing. In the state in which the R chamber fan 20 is driven, the cold air generated by the R evaporator 19 is supplied to the refrigerator compartment 3 and the vegetable compartment 4 and then returned to the lower part in the R evaporator chamber 18. It has come to be. An R-evacuation heater 21 for R-evacuation is provided in the R-evacuation chamber 18.

  In addition, a freezer compartment evaporator chamber (hereinafter referred to as F-evaporator chamber) 22 is formed in the switching chamber 5, an ice making freezer compartment (not shown), and a back side portion extending over the freezer compartment 6. In the evaporation chamber 22, there is provided a freezing chamber evaporator (hereinafter referred to as F evaporation) 23 that constitutes the refrigeration cycle apparatus 17, and is located at the upper portion thereof and can be driven at a variable speed (for example, 1800 to 2400 rpm). A freezing chamber blower fan (hereinafter referred to as F chamber fan) 24 is provided. An F defrost heater 25 is provided at the lower part of the F EVA 23.

Here, the downstream side (cold air blowing side) of the F chamber fan 24 provided in the F chamber 22 is branched into a cold air channel connected to the switching chamber 5 and a cold air channel connected to the freezing chamber 6, A switching chamber damper 26 that is controlled to be opened and closed by a control device (not shown) is provided in the cold air flow path connected to the switching chamber 5.
When the F chamber fan 24 is driven in a state in which the switching chamber damper 26 is closed, the cold air generated by the F evaporator 23 is supplied to the freezing chamber 6 and an ice making freezing chamber (not shown), and then again F Circulation is performed so as to be returned to the lower part in the evaporation chamber 22. On the other hand, when the F chamber fan 24 is driven with the switching chamber damper 26 opened (or partially opened), in addition to the cold air being supplied to the freezer compartment 6 and the ice making freezer compartment. After being supplied also into the switching chamber 5, the circulation is performed such that it is returned again to the lower part in the F-evaporation chamber 22.

  A machine room 27 is formed on the back surface of the lower end of the refrigerator main body 1, and a compressor 28 constituting the refrigeration cycle device 17 is provided in the machine room 27, and the compressor 28 and not shown are illustrated. A cooling fan 29 is provided for cooling the condenser. The compressor 28 is driven at a variable speed by inverter control (for example, the inverter operating frequency is 30 to 70 Hz), and the cooling fan 29 is also driven at a variable speed (for example 1800 to 2000 rpm). It has become.

  Now, in FIG. 1 showing a perspective view of the storage container 16 housed in the freezer compartment 6, a quick cold storage plate (corresponding to a lid) 30 is attached to the opening 16a of the storage container 16 in connection with the present invention. The quick cool storage plate 30 blocks almost half of the depth in the opening 16a of the storage container 16. This rapid cold storage plate 30 is formed by integrating a 0.8 t aluminum plate 32 into a frame 31 made of resin, and is attached to a rail portion 33 provided in an opening 16 a of the storage container 16, so that FIG. It is slidable from the closed position shown in FIG. 3 to the open position moved to the back shown in FIG. 3, and is configured to be stopped by a stopper (not shown) in the open position. In this case, as shown in FIG. 5, when the storage container 16 in which the quick cool storage plate 30 is located at the open position is returned to the freezer compartment 6, the quick cool storage plate 30 is pushed by the back wall of the freezer compartment 6. It slides from the open position to the closed position. Therefore, in a state where the storage container 16 is located in the freezer compartment 6, the quick cool storage plate 30 is positioned at the back of the opening 16a of the storage container 16 so as to block the cool air blown from the F EVA 23 to the storage container 16. is doing.

Next, the operation of the above configuration will be described.
When food is stored in the freezer compartment 6, the freezer compartment door 10 is pulled out as shown in FIG. 4 to pull out the storage container 16, and if necessary, the quick cool storage plate 30 is moved backward as shown in FIG. 5. After the food is stored in the storage container 16 in a slid state, the storage container 16 is stored in the freezer compartment 6. As a result, almost half of the depth of the opening 16 a of the storage container 16 is blocked by the quick cool storage plate 30, so that the cool air from the F EVA 23 is received by the quick cool storage plate 30 and then blown into the storage container 16. Thus, the food in the storage container 16 can be stored frozen for a long period of time.

By the way, although frozen food can be eaten with a good texture if cooked while maintaining the frozen state of moisture in the food, frozen food has a problem of deterioration in texture due to sublimation of moisture.
The reason why moisture sublimates from frozen food is due to the following phenomenon. That is, as shown in FIG. 6 (a), the frozen food 34 is usually packed in the storage bag 35. Therefore, when stored in the freezer compartment 6, the storage bag is brought into the cold air from the F-eva 23. 35 is exposed and the temperature of the storage bag 35 becomes the lowest. That is, if the target temperature of the freezer compartment 6 is −18 ° C. and the temperature of the cold air is −30 ° C., the temperature of the frozen food is −18 ° C., whereas the temperature of the storage bag 35 is regarded as −30 ° C. Can do. Thus, when the temperature of the storage bag 35 is extremely lower than that of the frozen food 34, the water sublimated from the frozen food 34 adheres to the inner surface of the storage bag 35 as frost (see FIG. 6A). In this case, all of the water sublimated from the frozen food 34 adheres to the inner surface of the storage bag 35 as frost. As a result, the saturated water vapor density in the storage bag 35 does not increase, and the water continuously sublimates from the frozen food 34. At the same time, the sublimated moisture adheres to the inner surface of the storage bag 35 as frost. As a result of such a phenomenon, the moisture of the frozen food 34 moves to the inside of the storage bag 35, so that a lot of moisture sublimates from the frozen food 34.

Moreover, when the temperature of the freezer compartment 6 rises by defrosting operation etc. and the temperature of the frozen food 34 falls below the temperature of the air in the storage bag 35, the frost adhering in the storage bag 35 sublimates, This time, although it comes to adhere to the frozen food 34 as frost (see FIG. 6B), when the temperature of the storage bag 35 is lowered again than the frozen food 34 due to the blowing of cold air, it adheres to the surface of the frozen food 34. The frost that has sublimated will adhere to the inside of the storage bag 35.
By repeating as described above, a large amount of moisture moves from the frozen food 34 to the inside of the storage bag 35. For this reason, when the frozen food 34 in which moisture has been sublimated in this way is cooked and eaten, the food becomes dry and the texture is greatly deteriorated.

  On the other hand, in the present embodiment, the rear part where the cool air from the F-evacuation 23 is blown in the opening 16a of the storage container 16 is blocked by the quick cool storage plate 30, so that the cool air sent to the storage container 16 is blown. Is once received by the quick cool storage plate 30 and then blown into the storage container 16. As a result, compared to a configuration in which cool air is directly blown into the storage container 16, the momentum of the cool air blown into the storage container 16 is greatly weakened, so that the inside of the storage container 16 is cooled almost uniformly. It is possible to cool the frozen food 34 and the storage bag 35 so that the temperature difference does not increase.

  Even when the frozen food 34 and the storage bag 35 are cooled so that the temperature difference does not increase in this way, although the water is sublimated from the frozen food 34, the temperature of the frozen food 34 and the storage bag 35 is the same. The water sublimated from the frozen food 34 adheres not only to the inner surface of the storage bag 35 but also to the surface of the frozen food 34. That is, even if moisture sublimates from the frozen food 34, a part of the moisture returns to the frozen food 34, so that the sublimation of moisture from the frozen food 34 and the return of frost to the frozen food 34 eventually balance. As a result, the sublimation of moisture from the frozen food 34 stops.

  Further, when the temperature of the storage bag 35 becomes higher than the temperature of the frozen food 34 due to the defrosting operation, the frost attached to the storage bag 35 sublimates and adheres to the surface of the frozen food 34. However, when the temperature of the storage bag 35 is lower than the temperature of the frozen food 34 due to the blowing of cold air, the temperature difference between the frozen food 34 and the storage bag 35 is not large, so that it adheres to the surface of the frozen food 34. The frost does not completely move to the inner surface of the storage bag 35, and moisture does not sublime from the frozen food 34.

Therefore, since the movement of moisture from the frozen food 34 is stopped, when the frozen food 34 is cooked and eaten, there is no feeling of patter and it can be eaten with a good texture. As a result, the food becomes porous due to drying, and the promotion of oxidation (so-called freezing burn) of food components due to an increase in surface area can be suppressed.
Moreover, the quick cool storage plate 30 is made of aluminum (thermal conductivity is 237 W / (m · K)), and the quick cool storage plate 30 is brought to an extremely low temperature (−30 ° C.) by blowing cool air from the F EVA 23. Since it can cool in a short time, the food located under the quick cool storage plate 30 can be efficiently cooled by radiation.

  Moreover, since the quick cool storage plate 30 does not completely close the opening 16a of the storage container 16, even if the frost adhered to the inside of the storage container 16 sublimes during the defrosting operation, the sublimated moisture is stored in the storage container 16. It can escape outside and it can prevent that frost accumulates.

  According to such a configuration, the cold air blown from the F-evacuation 23 at the opening 16a of the storage container 16 accommodated in the freezer compartment 6 is blocked by the quick cool storage plate 30, so that the cold air is directly in the storage container 16. Since the air is not blown, the temperature in the storage container 16 can be made substantially uniform. Therefore, the temperature difference between the frozen food 34 stored in the storage container 16 and the storage bag 35 for packaging it can be reduced, and the sublimation of moisture from the frozen food 34 can be prevented from continuing. It can prevent that the food texture at the time of cooking and eating frozen food 34 deteriorates.

  In addition, as a configuration that exhibits such excellent effects, it is only necessary to form the quick cool storage plate 30 with aluminum, so that the weight of the quick cool storage plate 30 is not excessively increased and the storage capacity of the storage container 16 is increased. Can be carried out without a significant increase in cost.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is characterized in that the rapid cold storage plate has substantially the same dimensions as the opening of the storage container.
As described in the first embodiment, since the rapid cold storage plate 30 is provided to weaken the momentum of the cool air blown from the F-eva 23, ideally, the size is preferably as large as possible. However, if the opening 16a of the storage container 16 is completely closed, the cooling of the storage container 16 to the food is only the radiation of the rapid cold storage plate 30, and the food in the storage container 16 can be sufficiently cooled. There is a risk of disappearing.

  Therefore, in this embodiment, in FIG. 7 showing the storage container 16 in a perspective view, the shape of the rapid cold storage plate 41 is matched with the shape of the opening 16a of the storage container 16, and the width of the peripheral edge of the aluminum plate 42 is, for example, A plurality of 5 mm long holes 43 are formed, and the quick cool storage plate 41 having such a structure is mounted on the upper surface of the storage container 16 so as to be slidable between a closed position shown in FIG. 7 and an open position shown in FIG. . In this case, the quick cool storage plate 41 is not sealed with respect to the storage container 16 due to the presence of the long holes 43.

  Since the cool air is blown to the storage container 16 through the long hole 43 of the quick cool storage plate 41, the momentum of the cool air blown to the storage container 16 can be greatly reduced, and the frozen food 34 stored in the storage container 16 can be reduced. Can be cooled so that the temperature difference from the storage bag 35 does not increase. In addition, although the amount of cool air blown into the storage container 16 is small compared to the first embodiment, the area of the quick cool storage plate 41 is large, so that the food is efficiently served by cooling the quick cool storage plate 41 by radiation. Can be cooled.

  According to such a configuration, most of the opening 16a of the storage container 16 is blocked by the quick cool storage plate 41, so that the momentum of the cool air blown to the storage container 16 can be sufficiently weakened. Similarly to the first embodiment, the frozen food 34 can be sufficiently cooled while suppressing the moisture of the frozen food 34 from sublimating. In this case, since the quick cool storage plate 41 is slidably provided on the upper surface of the storage container 16, by sliding the quick cool storage plate 41 in accordance with the amount of the frozen food stored in the storage container 16, the frozen food 34 Can be easily stored in the storage container 16.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. The third embodiment is characterized in that the quick cool storage plate can be bent in the middle.
In FIG. 9 which shows the storage container 16 in a perspective view, the quick cool storage plate 51 is configured by connecting two aluminum plates 52 with a connecting member (not shown), and can be bent around an intermediate portion. A long hole 53 is formed in the peripheral portion of the aluminum plate 52. In this case, in a state in which the quick cool storage plate 51 is mounted in the opening 16a of the storage container 16, the frozen food 34 is stored in the storage container 16 by lifting the aluminum plate 52 located in front as shown in FIG. be able to.

  According to such a configuration, since most of the opening 16a of the storage container 16 is blocked by the quick cool storage plate 51, the momentum of the cool air blown to the storage container 16 can be sufficiently reduced. Similarly to the first embodiment, the frozen food 34 can be sufficiently cooled while suppressing the moisture of the frozen food 34 from sublimating. In this case, since the quick cool storage plate 51 is provided so as to be bendable at the intermediate portion, by folding the quick cool storage plate 51 or lifting the whole according to the amount of the frozen food 34 stored in the storage container 16, The frozen food 34 can be easily stored in the storage container 16.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. The fourth embodiment is that the rapid cold storage plate 51 of the third embodiment is formed smaller than the inner shape of the storage container 16 and can be dropped into the storage container 16.
When the amount of the frozen food 34 in the storage container 16 is small as shown in FIG. 11, when the quick cool storage plate 51 is dropped into the storage container 16 as shown in FIG. 12, the quick cool storage plate 51 is placed on the frozen food 34. It will be in the state where it was mounted. In this state, when the cold air from the F-evapor 23 is blown to the storage container 16, the cold air blown to the frozen food 34 is blown through the long holes 53 of the quick cool storage plate 51, and is thus blocked by the quick cool storage plate 51. The formed space can be cooled almost uniformly. In this case, since the quick cool storage plate 51 is in contact with the storage bag 35 of the frozen food 34, the cooling efficiency by radiation of the quick cool storage plate 51 can be exhibited most.

In addition, when the amount of the frozen food 34 in the storage container 16 is large as shown in FIG. 13, the quick cold storage plate 51 is positioned at the opening 16a of the storage container 16 and the opening 16a is formed as shown in FIG. Will be blocked.
According to such a configuration, since the quick cool storage plate 51 is dropped into the storage container 16, the cooling efficiency of the frozen food 34 can be increased by radiation of the quick cool storage plate 51.

(5th Example)
Next, a fifth embodiment of the present invention will be described with reference to FIGS. The fifth embodiment is that a sub-storage container is provided in the storage container 16 and the present invention is implemented only on the sub-storage container.
In FIG. 15 showing the storage container 16 in perspective, the storage container 16 has a sub-storage chamber 61, and the quick cool storage plate 51 shown in the fourth embodiment is dropped into only the sub-storage chamber 61 as shown in FIG. It is possible. Accordingly, the frozen food 34 that has a large influence due to moisture sublimation or that is stored for a long period of time is appropriately cooled in accordance with the type of food by setting it as a cooling target by the rapid cooling plate 51 as shown in FIG. It can be saved.

(Other examples)
The present invention is not limited to the above embodiment, but can be modified or expanded as follows.
In the first and second embodiments, the quick cool storage plate 30 may stop in the freezer compartment 6 when the storage container 16 is taken out. In this case, since the opening 16a has already been opened when the storage container 16 is pulled out, the frozen food 34 can be stored in the storage container 16 without sliding the quick cold storage plate 30. Convenience is excellent.

The material of the quick cooling plate is not limited to aluminum, and any material can be used as long as the thermal conductivity exceeds 0.2 W / (m · K), which is a typical thermal conductivity of resin. be able to.
The present invention may be applied to the storage container 15 of the drawer type switching chamber 5.

The perspective view of the storage container in 1st Example of this invention Vertical side view of refrigerator Fig. 1 equivalent diagram showing the quick cool storage plate opened The perspective view which shows the state which pulled out the storage container of the freezer compartment FIG. 4 equivalent view showing the quick cool storage plate opened. Schematic diagram of frozen food showing the principle of moisture sublimation from frozen food FIG. 1 equivalent view showing a second embodiment of the present invention. 3 equivalent figure FIG. 1 equivalent view showing a third embodiment of the present invention. 3 equivalent figure The perspective view of the storage container which shows the accommodation state of the frozen food in 4th Example of this invention 1 equivalent diagram FIG. 11 equivalent diagram showing a full state of frozen food 3 equivalent figure The perspective view of the storage container which shows the accommodation state of the frozen food in 5th Example of this invention 1 equivalent diagram

Explanation of symbols

  In the drawings, 1 is a refrigerator body, 6 is a freezer compartment (freezing compartment), 16 is a storage container, 16a is an opening, 23 is an evaporator for the freezer compartment, 30, 41 and 51 are quick cool storage plates (lids), 34 Is a frozen food, 35 is a storage bag, and 61 is a sub-storage room.

Claims (7)

In a refrigerator equipped with a box-shaped storage container that is housed in a freezing compartment and the cold air from the evaporator is blown into the inside through an opening on the upper surface,
A non-hermetic lid having thermal conductivity that is attached to the storage container and blocks the cool air from the evaporator from being directly blown into the inside through the opening of the storage container in the attached state. A refrigerator characterized by.   The refrigerator according to claim 1, wherein the lid is provided so that a part or all of the opening of the storage container can be opened and closed by sliding the upper surface of the storage container.   The refrigerator according to claim 1, wherein the lid body is provided so as to be able to open and close part or all of the opening of the storage container by being bent in the depth direction.   The refrigerator according to claim 1 or 3, wherein the lid is formed smaller than the inner shape of the storage container and is placed on the food stored in the storage container. The storage container has a secondary storage chamber;
The refrigerator according to any one of claims 1 to 4, wherein the lid is provided so as to block cold air blown into the sub-storage chamber. It has a switching room where the cooling temperature can be switched,
The refrigerator according to any one of claims 1 to 5, wherein the freezing section is the switching room. The refrigerator according to any one of claims 1 to 6, wherein the thermal conductivity of the lid body is higher than 0.2 W / (m · K).

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