JP2710481B2 - Water bath - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water bath, for example,
The present invention relates to a food prepared by vacuum-packaging food such as fresh food and semi-processed food using hot water as a medium.

[0002]

BACKGROUND ART Vacuum recipe, fresh food, vacuum packaging foodstuffs, such as semi-processed food full I Lum shaped bags, of about 55 ° C. to 70 ° C. The water bath unit in the state of the food remains vacuum packing By cooking at a low temperature for several tens of minutes to several hours, vacuum-packed food is cooked at a low temperature to contain the extract of the food and finish it softly, making the best use of the ingredients to make a delicious food, for example, meat is tender It is said to taste good.

[0003] Since dishes can be prepared in advance for several hours to about one week before serving food at a dining table, they are used in restaurants and hotels.

[0004] A conventional water decoction cooker for cooking vacuum-packaged foods used in such cooking is provided with a heater at the bottom of the bath, and the heater heats the water in the bath. A structure in which the heater is controlled by a temperature sensor directly attached to the heater has been adopted.

[0005]

In a conventional water bath, the water is transferred from one side of a heater provided at the bottom of the bath.
The heating efficiency of the decoction tank is low, the heat transfer area efficiency is low at 50%, and the rising of the hot water temperature is slow as shown by the temperature characteristic A shown in FIG. The problem of large undershoot (point a) with temperature
is there.

Further, even when the power supply to the heater is cut off, the heat transfer of heat energy is low, so that the energy holding time is long, and the overshoot greatly exceeds the set temperature (point b).
There is a problem that, also, since the conventional water bath device which is temperature sensor directly attached to the hot water tank, dull sense of hot water temperature changes, delayed control of the power supply to the heater, overshoot, causing undershoot There was a problem.

In such low-temperature cooking, since the cooking time is long, the cooking temperature is liable to change, and the change in the temperature of hot water during cooking does not have a good effect on foods, and the quality of cooking deteriorates. there were.

[0008] Vacuum-packaged foods change in taste by adjusting the temperature of the hot water, and the taste changes when the temperature of the hot water changes by 2 ° C.
Is said to you change, the can delicious cooking when cooking by setting the hot water temperature and the cooking time, the hot water temperature is required to be controlled within a range of about 0.5 ℃ set temperature I have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a water bath that has a small temperature error with respect to a set temperature of hot water, has high thermal efficiency, and can perform low-temperature cooking of vacuum-packaged food for a long time. Things.

[0010]

Means for Solving the Problems] water bath of claim 1 is provided with a hot water tank, and a hot water tank and the electrical heater, wherein
Attach the electric heater to the bottom of the water bath and
The hot water bath and the hot water bath formed on the lower surface of the electric heater
The electrical heater closely Sekkyogi, via the warm water tank from the hot water bath to form a hot-water circulation path to return to the hot water tank, circulation of warm water hot water tank via the warm water tank from the hot water tank to the hot-water circulation path A pump is provided.

A water heater according to a second aspect of the present invention is the water heater according to the first aspect, wherein the pipe is connected in two directions in a branch from the outlet of the hot water tank to the inlet of the water bath in the hot water circulation path.
Formed in a branch and connected to the two bottoms of the water bath.
Connected to the introduction part formed in
A temperature sensor for controlling an electric heater is provided in the middle of one of the conduits .

[0012]

In the water bath of the first aspect, the electric heater is closely sandwiched between the water bath and the hot water bath, so that the hot water in the water bath is heated by direct heat conduction from the electric heater. hot water hot water tank is also heated by heat conduction from the electric heater, hot water hot water tank is circulated through the hot water circulation path to return to the hot water tank via the warm water tank by a pump from the water bath tank. Therefore, the hot water is heated by heat conduction from both sides of the heater, the thermal efficiency is enhanced, the rising of the hot water temperature is improved, the undershoot with respect to the set temperature is reduced, and the hot water is supplied from the hot water bath in the hot water circulation path. Since the water is circulated through the water bath to the hot water bath, overshoot with respect to the set temperature is reduced, and the error range of the hot water with respect to the set temperature is narrowed.

A water heater according to a second aspect of the present invention is the hot water bath according to the first aspect, wherein the water heater is provided at an outlet of a hot water tank in a hot water circulation path.
It branches off to the introduction part of the water bath, and the bottom part of the water bath
And the temperature of the hot water in the water bath decreases.
In addition, since a temperature sensor that controls the electric heater is provided between the outlet of the hot water tank and the inlet of the hot water bath in the hot water circulation path, the temperature of the hot water supplied to the hot water bath can be directly detected. Temperature change can be reliably detected, overshoot and undershoot with respect to the set temperature are reduced, and the error range of the hot water with respect to the set temperature is reliably narrowed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the water bath of the present invention will be described with reference to FIGS.

1 is a hot water bath main body, and a hot water bath 2 having an open upper surface is disposed on the upper portion of the main body 1. The upper opening of the hot water bath 2 is closed by a lid 3 so as to be openable and closable.

An electric heater 4 is closely attached to the bottom of the water bath 2, and a hot water tank 5 is formed on the lower surface of the electric heater 4. The hot water tank 5 and the water bath 2 are electrically connected to each other. /> the heater 4 close clamped, the hot water tank 2 and the hot water tank 5
Heat from the electric heater 4 is conducted, and the hot water is heated.

An outlet 6 is opened at one corner on one side of the bottom of the water bath 2, and a suction side of a pump 8 is connected to a conduit 7 which is connected to the outlet 6 in a liquid-tight manner.
The discharge side is connected in a liquid-tight manner with a conduit 10 to an inlet 9 opened at the center of one side of the bottom of the hot water tank 5.

Further, a conduit 12 is liquid-tightly connected to a lead-out portion 11 which is opened at the center of the other side of the bottom of the hot water tank 5, and conduits 13 and 14 which are bifurcated and connected to the conduit 12 are connected to the water bath. 2
Are connected in a liquid-tight manner to the introduction portions 15 which are opened at two places at both corners on the other side of the bottom.

Thus, conduit 7, pump 8, conduit 10,
A hot water circulation path 16 is formed by the hot water tank 5 and the conduits 12, 13 and 14 to return from the hot water bath 2 to the hot water bath 2 via the hot water tank 5 and return to two places in the hot water bath 2.

Further, the temperature of the hot water flowing through the conduit 13 is detected at an intermediate portion of the one of the branched and connected conduits 13 to detect the electric power.
A temperature sensor 17 for controlling the air heater 4 is provided.

A heat insulating material 18 in contact with the bottom of the hot water tank 5 is held by a heat insulating cover 19.

Further, an electric control unit (not shown) is provided below the hot water tank 5 in the main body 1.
A time setting device 21 and a temperature setting device 22 are attached to a panel 20 provided at a lower portion of the front surface of the device. Further, the panel 20 is provided with a timer switch 23, a heater start indication lamp 24, and a power switch 25. . Further, the main body 1 is provided with a buzzer (not shown) for notifying the elapse of the set time.

In addition, a drain cock 26 of the hot water bath 2 and the hot water bath 5 is provided at a lower portion of the front surface of the main body 1.

Next, the operation of this embodiment will be described.

After the hot water is supplied to the water bath 2, the cooking time is set by the time setting device 21 and the cooking temperature is set by the temperature setting device 22. Then is turned on the power switch 25, the timer switch 23 is energized electric heater 4 with start, driven pump 8 at the same time, the hot water of a hot water bath tank 2 water bath tank
2 to conduit 7, pump 8, conduit 10, hot water tank 5, conduit 12,
Warm water circulation passage 16 formed by 13, 14 and circulation, hot water tank 2
Hot water is heated in the hot water tank 5 and returned to the hot water bath 2
You.

Then, the temperature of the circulating hot water is detected by the temperature sensor 17, and energization to the electric heater 4 is controlled according to the temperature set by the temperature setting device 22. Also this
The heater start display lamp 24 is turned on only when the electric heater 4 is energized. Further, when the time set by the time setting device 21 has elapsed, the timer switch 23 is operated to activate the electric heater 4.
When the power supply to is shut off, the buzzer operates to notify the end of hot water cooking.

[0027] Then, since the electric heater 4 closely sandwiched between hot water tank 2 and the warm water bath 5, and hot water of the hot water tank 5 together with the hot water hot water tank 2 is heated by direct heat conduction from the electric heater 4 Electrical Heated by the heat conduction from the heater 4, the hot water in the hot water tank 5 is supplied from the hot water bath 2 to the hot water bath 2 by a pump through the hot water circulation path 16 returning to the hot water bath 2 via the hot water bath 5.

As described above, the hot water is heated by the heat conduction from both sides of the electric heater 4, the thermal efficiency is improved, the rising of the hot water temperature is improved, the undershoot relative to the set temperature is reduced, and the hot water circulation path 16 Since hot water is circulated from the hot water bath 2 to the hot water bath 2 through the hot water bath 5, overshoot with respect to the set temperature is reduced.

Further, there is a temperature difference between the hot water flowing from the hot water and hot water tank 5 to the hot water tank 2 flows out from the outlet portion 6 of the hot water tank 2 in a hot water bath 5, temperature sensor 17 of the hot water circulation path 16 temperature Since it is provided between the outlet 11 of the water tank 5 and the introduction part 15 of the hot water bath 2, the temperature of the hot water flowing out of the hot water bath 5 and the temperature of the hot water supplied to the hot water bath 2 can be directly detected. Temperature change can be reliably detected, overshoot against set temperature,
Undershoot is reduced.

Furthermore, the hot water that flows from the hot water tank 5 to the hot water tank 2, the hot water tank 2 in the conduit 13 which is branched and connected to the two directions of the other side of the bottom corners corner of Section 2 where it opens into the Introduction 15
And the variation of the hot water temperature in the hot water bath 2 is reduced.

Further, since the hot water tank 5 is provided at the bottom of the water bath 2, heat radiation to the lower part of the main body 1 is reduced, so that adverse thermal effects on the electric control part provided at the lower part of the main body 1 can be prevented.

According to the experiment of the inventor, the hot water tank 5
The electric heater 4 is controlled by the temperature of the hot water flowing into the hot water bath 2
It is confirmed that it is best to control the electric heater 4. Further, since heating is performed by heat conduction from both sides of the electric heater 4, the heat transfer area efficiency is high, and the temperature characteristic B shown in FIG. As shown in the figure, it was confirmed that the temperature of the hot water rises quickly, and the undershoot c and the overshoot d decrease with respect to the set temperature as shown in the temperature characteristic B shown in FIG. Then, for a set temperature, low-temperature cooking of about 55 ° C to 70 ° C takes several tens of minutes to
Even if the cooking time is long for about several hours, the temperature error is within the range e of ± 5 ° C., the change in the cooking temperature is small, and the quality of the cooking does not deteriorate.

[0033]

According to the first aspect of the present invention, the electric heater is tightly sandwiched between the hot water bath and the hot water bath, and the hot water in the hot water bath is
The hot water in the hot water tank is heated by the heat conduction from the electric heater while the hot water in the hot water tank is heated by the direct heat conduction from the electric heater, and the hot water in the hot water tank returns from the hot water bath to the hot water bath via the hot water bath by the pump. Is supplied to the hot water bath in a circulating flow, so that the thermal efficiency is improved, the rise of the hot water temperature is improved, the undershoot for the set temperature is reduced, the overshoot for the set temperature is reduced, and the hot water is set at the set temperature. Error range is narrowed, the temperature change with respect to the set temperature of hot water is small,
Thermal efficiency is enhanced, and long-term low-temperature cooking of vacuum-packaged food can be improved. Further, since the hot water tank is provided at the lower part of the water bath, heat radiation to the outside of the main body is small, and the temperature drop in the main body can be suppressed.

According to the second aspect of the present invention, hot water circulation
Branch from the outlet of the hot water tank on the road to the introduction of the hot water bath
To return hot water to two places at the bottom of the bath.
Variations in the temperature of the hot water in the tank are reduced, and the voltage between the outlet of the hot water tank and the inlet of the hot water bath in the hot water circuit is reduced.
Since a temperature sensor for controlling the air heater is provided, the temperature of the hot water supplied to the hot water bath can be directly detected, the temperature change of the hot water can be reliably detected, overshoot and undershoot with respect to the set temperature are reduced, and the hot water is The error range for the set temperature is reliably narrowed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a water bath showing one embodiment of the present invention.

FIG. 2 is a lower perspective view of a hot water tank part of the hot water bath.

FIG. 3 is a front view of the same hot water bath.

FIG. 4 is a rise temperature characteristic diagram of a water bath.

FIG. 5 is a temperature control characteristic diagram of a water bath.

[Explanation of symbols]

2 Hot water bath 4 Electric heater 5 Hot water bath 8 Pump 11 Outgoing section of hot water tank 13, 14 conduit 15 Introducing section of hot water bath 16 Hot water circulation path 17 Temperature sensor

Claims (2)

(57) [Claims] 1. A water bath, a hot water bath and an electric heater , wherein the electric heater is in close contact with the bottom of the water bath.
The hot water tank and the hot water bath formed on the lower surface of the electric heater
The electrical heater closely Sekkyogi a bath, through a warm water bath from the hot water bath to form a hot-water circulation path to return to the hot water tank, hot water in the hot water tank via the warm water tank from the hot water tank to the hot-water circulation path A water bath equipped with a circulation pump. 2. A conduit, which is bifurcated and connected in two directions, from a hot water tank outlet to a hot water bath inlet of a hot water circulation path.
Then, this branch-connected pipe is formed at the bottom two places of the water bath.
Connected to each other,
The water bath according to claim 1, wherein a temperature sensor for controlling the electric heater is provided in the middle of the conduit .