KR101304222B1 - Thermokeeping cooker using pcm - Google Patents

Abstract

The present invention relates to an insulating cooking container using a phase change material, the insulating cooking container using a phase change material according to the present invention, a cooking plate on which food is placed, a heating plate in contact with a heat source for heating the food, and the cooking A container body including a latent heat storage unit, the space formed between the plate and the heating plate; And a latent heat material provided in the latent heat material storage part, the latent heat material including a phase change material (PCM) for supplying heat to the cooking plate so that the cooking plate maintains a constant temperature. The latent heat material to be injected is characterized in that a phase change occurs at at least one of a cooking completion temperature and a warming temperature of the food, and when the cooking completion temperature is reached by using an insulating cooking container using a phase change material according to the present invention. The cooking completion temperature is maintained even when the heat source is removed, thus saving energy used for cooking food, and even if the timing for removing the heat source is not increased, the temperature does not rise for a certain period of time to prevent the cooking plate from overheating. When the temperature is lowered at the cooking completion temperature and reaches the warming temperature, when heat is supplied to the food from the latent heat material, Since the phase change occurs, it is possible to maintain the warming temperature for a certain time, thereby saving energy used for reheating, and by using sugar alcohol and paraffin type phase change materials, it is possible to prevent the latent heat storage part in the container body from being oxidized. .

Description

Insulating cooking container using phase change material {THERMOKEEPING COOKER USING PCM}

The present invention relates to an insulated cooking container using a phase change material, and relates to an insulated cooking container using a phase change material that can insulate cooked food for a long time by using latent heat generated when the material changes phase. .

In general, when the heat source of the same intensity is continuously supplied when cooking food, the temperature of the cooking vessel continues to rise, so in order to maintain the temperature of the cooking vessel, it is necessary to cook the food while adjusting the intensity of the heat source. Therefore, it is difficult for non-skilled people to prevent food from sticking or burning, and energy is unnecessarily consumed in the process of overcooking food. In addition, the cooked food is eaten in a bowl such as a plate to eat while the food is cooled in the middle of eating the food is reduced in taste.

Adjusting the proper food cooking temperature during cooking slows down the temperature of the cooking vessel continuously by setting the cooking time using a timer to prevent food from being overcooked and reducing the intensity of the heat source after a certain time. . However, even if a timer is used, the degree of supplying heat to the cooking vessel varies depending on the intensity of the heat source, so that the non-skilled person could not prevent the food from sticking or burning while cooking the food.

In addition, after the cooking is completed, the cooked food is reheated to increase the temperature of the food after the food is cooled, and the food is eaten again, thereby reheating the cooked food first, thus giving the same taste as when the food was initially cooked. It was difficult. In addition, because it takes time to warm the food to the desired temperature during the reheating process, energy consumption is increased and the food is kept at a low temperature until the food is heated. In addition, when the food is continuously heated from the beginning to maintain the temperature of the food, since the heat is continuously applied to the cooking container even after the cooking of the food is completed, the food burns while being pressed onto the cooking container. In addition, even when food is not burned, if the container is overheated, the temperature of the food becomes higher than the time of completion of cooking, and the intrinsic taste of the food is still lowered.

Therefore, in recent years, when the appropriate temperature is reached, the temperature can be maintained even when the heating is stopped, thereby saving energy, maintaining the temperature of the food for a long time, and changing the phase to heat the food with a small amount of energy when reheating. There is a need for a thermal cooking container using materials.

The problem to be solved by the present invention is to provide a cooking container using a phase change material that can save energy by maintaining the temperature of the completed cooking state for a long time without overheating the cooked food.

The present invention is a container body including a cooking plate on which food is placed, a heating plate in contact with a heat source for applying heat to the food, and a latent heat storage unit which is a space formed between the cooking plate and the heating plate; And

It is provided in the latent heat storage unit, and includes a latent heat material made of a phase change material (PCM) for supplying heat as it exits from the cooking plate to maintain a constant temperature,

The latent heat material injected into the latent heat storage unit provides a thermal cooking container using a phase change material, characterized in that a phase change occurs at at least one of a cooking completion temperature and a warming temperature of food.

According to an embodiment of the present invention, it is preferable that the insulating cooking container using the phase change material further includes a temperature display unit indicating the temperature of the cooking plate.

In addition, the cooking plate is formed to be inclined from the heating plate,

It is preferable that the oil discharge hole is perforated at the lower end of the inclined surface of the cooking plate.

In addition, the container body is preferably formed with a latent heat inlet for communicating with the latent heat storage portion.

In addition, the latent heat material is preferably prepared by mixing two or more phase change materials having different temperatures at which phase changes occur.

In addition, the latent heat material is preferably a phase change at 40 ℃ to 60 ℃.

In addition, the latent heat material is preferably changed in phase at 140 ℃ to 170 ℃.

In addition, the latent heat material, including a high temperature phase change material that changes in phase at the cooking completion temperature, and a low temperature phase change material that changes in phase at the warming temperature,

The high temperature phase change material is any one or more sugar alcohol phase change material selected from xylitol, isomalt, maltitol and mannitol,

The low temperature phase change material is preferably a paraffinic phase change material having 18 to 30 carbon atoms.

Here, the latent heat material preferably further comprises a nucleating agent.

According to the present invention, when the latent heat material changes phase and reaches an appropriate temperature suitable for cooking food, the amount of energy can be reduced because the cooking vessel can maintain the temperature by the latent heat emitted from the latent heat material even if the heat source is removed. have. In addition, since the phase change occurs in the latent heat material while the food is kept warm, it is possible to prevent the temperature of the heating plate from being drastically lowered. The energy used to reheat can be saved. Furthermore, even if the timing of removing the heat source is missed while the cooking vessel is being heated, the temperature rises as the latent heat material phase changes so that the cooking plate can be prevented from being overheated, so even unskilled persons can easily prepare food. By using sugar alcohol-based and paraffin-based phase change materials as latent heat materials, it is possible to prevent oxidation of the latent heat storage material in the container body, and to produce various latent heat materials by mixing phase change materials having different phase change temperatures. Insulation performance can be achieved.

1 is a perspective view of an insulating cooking container using a phase change material according to an embodiment of the present invention.
2 is a cross-sectional view of the insulating cooking container using a phase change material according to an embodiment of the present invention.
Figure 3 is an SEM image showing a latent heat material used in one embodiment of the present invention.
4 is a liquid state photograph of a latent heat material used in Examples 1 and 2 of the present invention.
5 is a solid state picture of the latent heat-retaining material of Example 1 and Example 2 of FIG.
6 is a graph showing the temperature holding characteristics of the latent heat material according to Example 1 of the present invention.
7 is a graph showing the temperature holding characteristics of the latent heat material according to Example 2 of the present invention.

Hereinafter, the present invention will be described in more detail with reference to preferred examples. It will be apparent to those skilled in the art, however, that these examples are provided to further illustrate the present invention, and the scope of the present invention is not limited thereto.

In order to cook the food (F) while preventing the food (F) burned or pressed, the insulating cooking container using a phase change material according to the present invention includes a latent heat material 200 made of a phase change material. Therefore, when the latent heat material 200 starts to change phase after the heat supply from the heat source H is cut off, the food F is continuously supplied with heat by the latent heat discharged from the latent heat material 200 during the phase change. Thus, it is possible to maintain the cooking state of the food (F). In addition, the use of a latent heat material having a second phase change temperature higher than room temperature may provide an effect of warming the cooked food. Therefore, the food (F) can be cooked at a temperature at which the most delicious intake and the cooked food can be kept warm.

1 is a perspective view of an insulating cooking container using a phase change material according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the insulating cooking container using a phase change material according to an embodiment of the present invention. have.

Insulating cooking container using a phase change material according to an embodiment of the present invention, so as to implement the above performance, as shown in Figure 1, the food plate (F) is the cooking plate 110, the food (F) Container body 100 including a heating plate 120 in contact with the heat source (H) that applies heat to the heat), and a latent heat storage unit 130 is a space formed between the cooking plate 110 and the heating plate 120; And

It is provided in the latent heat storage unit 130, the latent heat material (PCM) made of a phase change material (PCM) for supplying heat as it exits from the cooking plate 110 so that the cooking plate 110 to maintain a constant temperature ( 200),

The latent heat material 200 injected into the latent heat material storage unit 130 is characterized in that a phase change occurs at at least one of a cooking completion temperature and a warming temperature of the food (F).

When the heating plate 120 is heated by the heat source H, the cooking plate 110 is heated while heating up the latent heat material 200 injected into the latent heat storage unit 130. At this time, the insulating cooking container using the phase change material is provided with a temperature display unit 150 indicating the temperature of the cooking plate 110, it is possible to check the temperature of the cooking plate 110.

Various foods can be cooked in a thermo-cooking container using a phase-change material. However, if a thermo-cooking container using a phase-change material is used to cook meat, oil may be released from the meat during the cooking process. . Therefore, it is preferable to form an oil discharge hole 140 at one side of the insulating cooking container using a phase change material. In particular, in order to smoothly discharge the meat oil through the oil discharge hole 140, the cooking plate 110 is formed to be inclined from the heating plate 120, the oil discharge hole (one side of the lower end of the inclined cooking plate 110) 140 may be formed. That is, the position of the oil discharge hole 140 in the cooking plate 110 is preferably provided at the bottom. When the cooking plate 110 is inclined from the heating plate 120 as described above, even if the cooking plate 110 is far from the heat source H, the cooking plate 110 is injected into the latent heat storage unit 130. Since heat is supplied to the cooking plate 110, heat is evenly transmitted to the cooking plate 110 regardless of the distance from the heat source H. Therefore, the heat can be smoothly transferred to the cooking plate 110 at a position far from the heat source H, and the oil discharge hole 140 close to the heat source H can be prevented from being overheated. . Therefore, the oil passing through the oil discharge hole 140 may be prevented from being overheated, thereby minimizing the generation of smoke in the cooking process.

The latent heat material 200 injected into the latent heat material storage unit 130 may be injected in an initial state in which an insulating cooking container using a phase change material is manufactured, but communicates with the latent heat material storage unit 130 of the container body 100. By forming the latent heat input hole 160, various kinds of latent heat materials 200 may be injected or discharged according to the cooking temperature of the food F to be cooked. Here, the position where the latent heat input hole 160 is formed may be arranged differently according to the use of the latent heat input hole 160. That is, when the latent heat inlet 160 is formed to replenish the latent heat 200, as shown in FIG. 1, the latent heat inlet 160 may be formed on the upper side of the container body 100. In order to replace the latent heat material 200, the latent heat material inlet 160 for discharging the latent heat material 200 and the latent heat material inlet 160 for injecting the latent heat material 200 may be provided separately, and an installation position may also be provided. You can change it.

Insulating cooking container using a phase change material may keep the food (F) by the latent heat that the latent heat material 200 injected into the latent heat storage unit 130 during phase change. That is, as shown in FIG. 2A, when the latent heat material 200 in the first state 210 is heated by the heat source H, the latent heat material 200 in the first state 210 is heated and the cooking plate ( The temperature of 110 rises, and the food F is cooked. When the latent heat material 200 is continuously heated for a predetermined time or more, the latent heat material 200 in the first state 210 causes a phase change to the second state 220 as shown in FIG. 2B. do. Since the latent heat material used in the thermal insulation cooking container using the phase change material according to the present invention changes phase at the cooking completion temperature of the food, even if the heat source H is removed at the cooking completion temperature through the temperature display unit 150, the phase change material is changed. The temperature of the cooking vessel using the temperature is not immediately lowered, and the cooking completion temperature is maintained for a predetermined time, that is, until the phase change completion of the latent heat material 200 in the second state 220 to the first state 210 is completed. do. Therefore, even when the food F is heated, the temperature of the thermal cooking container using the phase change material may be maintained by the heat generated by the latent heat material 200 without using any energy. In addition, the cooking container using a phase change material in this process prevents the food (F) from overheating because the temperature does not increase even when the food (F) is cooked, thereby making it easier for unskilled persons to adjust the intensity of the heat source. The effect can be obtained.

That is, after removing the heat source H, the latent heat material 200 in the second state 220 is shown in FIG. 2C before the temperature is lowered because the latent heat material 200 tries to decrease the temperature to room temperature. Likewise, the phase changes to the first state 210 first. In this process, since the latent heat material 200 is enclosed by the container body 100, the latent heat material 200 supplies heat to the container body 100 by an amount in which the temperature of the container body 100 is lowered. That is, the temperature of the cooking plate 110 is not further increased, but the temperature of the cooking plate 110 may be maintained at the cooking completion temperature while the latent heat material 200 is phase-changed. Therefore, the temperature of the cooking plate 110 does not immediately cool and the food F is continuously cooked.

In addition, even if the timing of removing the heat source is missed momentarily, when the phase change proceeds, the temperature of the latent heat material 200 does not increase and the heat received from the heat source H is latent heat material 200 in the first state 210. ) Is used to phase change to the second state 220. Therefore, since the cooking plate 110 may maintain a constant temperature at the time when the phase change of the latent heat material 200 proceeds, the cooking plate 110 may be overheated during the cooking process to prevent food (F) from burning. Will be.

In addition, if the temperature at which the food F is to be kept warm after the cooking is completed is different from the cooking completion temperature of the food F, the latent heat material 200 is prepared by mixing two or more phase change materials having different phase change temperatures. ) Is preferably injected into the latent heat storage unit 130. For example, if meat is used as the food (F), and the meat is cooked at 140 ° C. to 170 ° C. and kept warm at 40 ° C. to 60 ° C., a latent heat material is prepared by preparing a phase change material at which the phase change occurs at each of the above temperatures. Can be used as After the heat source is removed, the cooking temperature is lowered from the cooking completion temperature of the first phase change temperature to the warming temperature of the second phase change temperature after the cooking is completed. Thereafter, while maintaining the phase change, the cooking plate 110 may maintain the second phase change temperature of 40 ° C. to 60 ° C. to keep the food F warmed. This temperature is particularly suitable when cooking meat. As described above, if the latent heat phase changes at a warming temperature at a temperature other than the cooking completion temperature of the food, the temperature of the cooked cooking vessel using the phase change material is maintained for a predetermined time when the warming temperature is reached. It is possible to shorten the time to heat the cooking container using a phase change material. Therefore, it is possible to save energy used to heat the cooking container using a phase change material. That is, in the case of a general cooking container, the temperature of the cooking container is continuously lowered when the heat source is removed, whereas the insulating cooking container using the phase change material according to the present invention is not only cooked at a completion temperature but also at a temperature for a predetermined time. Maintain the temperature. Therefore, even if the same time elapses, since the temperature of the thermal cooking container using the phase change material according to the present invention is higher, the time taken to heat the thermal cooking container using the phase change material is further shortened.

In addition, the insulating cooking container using a phase change material according to the present invention can be used even when food (F) is intended to maintain a low temperature state. That is, when the temperature at which the latent heat material 200 injected into the insulating cooking container using a phase change material is lower than room temperature, a phase change occurs for a predetermined time before the temperature of the latent heat material 200 rises to room temperature. While the latent heat material 200 is to absorb the surrounding heat. Insulating cooking container using a phase change material according to the present invention using this principle, it is possible to maintain the food (F) located on the cooking plate 110 in a low temperature state.

Insulating cooking container using a phase change material shown here is shown in a shape mainly used for roasting, etc., but the shape of the insulating cooking container using a phase change material is not limited to this, manufactured by changing to a variety of shapes according to the cooking method Can be.

The latent heat material used in the thermal insulation cooking container using the phase change material according to the present invention is a mixture of the latent heat material which changes in phase at the cooking completion temperature and the latent heat material which changes in phase at the warming temperature, using the phase change material according to the present invention. For a preferred embodiment of the latent heat material is injected into the thermal insulation cooking container will be described in detail the characteristics of the latent heat material.

Example  One

The properties of the high temperature phase change material and the low temperature phase change material used in this example are shown in Table 1, and the surface photograph thereof is shown in FIG. 3. 3A shows an SEM image of a high temperature phase change material, and FIG. 3B shows an SEM image of a low temperature phase change material.

division High temperature phase change material Low temperature phase change material The C ₂₂ H ₄₄ C ₆ H ₁₄ O ₆ Appearance Transparent blue solid White solid powder Melting point 42 ℃ 164 ℃ density 0.88 g / cm ³ 1.5 g / cm ³

The phase transition temperature is a temperature at which the phase transition occurs from the solid phase to the liquid phase, but may vary depending on the measurement method. In the present invention, the phase transition temperature is used as the melting point.

The latent heat material was dissolved at 170 ° C. like the high temperature phase change material shown in FIG. 4A and the low temperature phase change material shown in FIG. 4B, respectively, mixed at a 6: 4 weight ratio, and stirred at 500 rpm for 10 minutes. Emulsified colloid was prepared by adding 5.5% by weight of C ₁₈ H ₃₈ as a nucleating agent and 6% by weight of water to 72.5% by weight of the mixture of the high temperature and low temperature phase change materials and emulsifying at 5000 rpm for 10 minutes.

Melamine resin and water were mixed at a weight ratio of 5: 5, and stirred at 600 rpm at 60 ° C. for 15 minutes to prepare an aqueous polymer solution.

84 wt% of the emulsified colloid and 16 wt% of the aqueous polymer solution were polymerized and mixed at 60 rpm at 60 rpm for 3 hours to prepare a composite latent heat material of Example 1 in the form of a microcapsule slurry.

Example  2

In the same manner as in Example 1, a mixed latent material of Example 2 was prepared by mixing a mixing ratio of a high temperature phase change material and a low temperature phase change material in an 8: 2 weight ratio.

Experimental Example  1: temperature holding characteristic

In order to confirm the temperature holding characteristics of the composite latent heat material compositions of Examples 1 and 2, a temperature measuring device composed of a heat source, a temperature sensor, and a control and measuring device was used.

200 ml of the composite latent heat composition compositions of Examples 1 and 2 were put into containers, respectively, heated to 170 ° C., and then cooled naturally to measure temperature change. The volume was adjusted in the liquid state by one heating, and after cooling to 24 ° C., it was performed in the solid state such as the high temperature phase change material shown in FIG. 5A and the low temperature phase change material shown in FIG. 5B. The temperature at the center of the vessel filled with latent heat was measured, and the heat source was removed when the temperature reached 170 ° C or higher.

The volume change of the sample was compared with 200 ml water at the time of heat source removal, and the temperature change characteristics of the sample were analyzed during the process of solid → liquid → solid. The experiment was repeated three times and the average temperature was 13.5 ° C.

During the experiment, the heating time up to the maximum temperature is the rising time, the falling time from the highest temperature to 30 ℃, the falling time, the holding time from 170 ℃ to 140 ℃ high temperature holding time and the holding time from 40 ℃ to 60 ℃ It was shown in Table 2 by measuring the respective temperature holding time.

division Example 1 Example 2 Ascent time 38 minutes 42 minutes Descent time 122 minutes 128 minutes High temperature holding time 23 minutes 39 minutes Medium temperature holding time 35 minutes 42 minutes

Both Examples 1 and 2 had a phase change in the high temperature range and the low temperature range, it could be seen that the two levels of temperature maintenance intervals. However, in the case of Example 2, the temperature holding time is kept particularly long at a relatively high temperature compared to Example 1, and the fall time or the medium temperature holding time was longer as a whole.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: cooking container using a phase change material 110: cooking plate
120: heating plate 130: latent heat storage unit
140: oil discharge hole 150: temperature display unit
160: latent heat inlet 200: latent heat
210: first state 220: second state
F: Food

Claims (9)

A container body including a cooking plate on which food is seated, a heating plate in contact with a heat source that heats food, and a latent heat storage unit, the space being formed between the cooking plate and the heating plate; And
It is provided in the latent heat storage unit, and includes a latent heat material made of a phase change material (PCM) for supplying heat as it exits from the cooking plate to maintain a constant temperature,
The latent heat material injected into the latent heat storage unit, and the phase change occurs at one or more of a cooking completion temperature and a warming temperature of food, is a high temperature phase change material which changes in phase at a cooking completion temperature, and a low temperature changing at a warm temperature. Contains a phase change material,
The high temperature phase change material is any one or more sugar alcohol-based phase change material selected from xylitol, isomalt, maltitol and mannitol,
The low-temperature phase change material is a thermal cooking container using a phase change material, characterized in that the paraffin-based phase change material having 18 to 30 carbon atoms. The method of claim 1,
The insulating cooking container using the phase change material further comprises a temperature display unit indicating the temperature of the cooking plate. The method of claim 1,
The cooking plate is formed to be inclined from the heating plate,
Insulating cooking container using a phase change material, characterized in that the oil discharge hole is drilled in the lower end of the inclined surface of the cooking plate. The method of claim 1,
The container body is a thermal insulation cooking container using a phase change material, characterized in that the latent material inlet is formed in communication with the latent material storage unit. The method of claim 1,
The latent heat material, the insulation cooking container using a phase change material, characterized in that the mixture is prepared by mixing two or more phase change material having a different temperature. The method of claim 1,
The latent heat material is a cooking container using a phase change material, characterized in that the phase change at 40 ℃ to 60 ℃. The method of claim 1,
The latent heat insulating container using a phase change material, characterized in that the phase change at 140 ℃ to 170 ℃. delete The method of claim 1,
The latent heat insulating container using a phase change material, characterized in that it further comprises a nucleating agent.

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