JP2013174397A - Liquid tank heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid tank heating device capable of suppressing a liquid temperature drop in a liquid tank as much as possible when a gas burner of a gas chamber is extinguished.SOLUTION: A liquid tank heating device includes a liquid tank 4, a gas combustion chamber 6 with a gas burner 10 disposed for heating the liquid tank 4, an exhaust path 12 for discharging combustion exhaust gas from the gas combustion chamber 6 to an external space, and an opening/closing mechanism 14 disposed in the exhaust path 12. The opening/closing mechanism 14 is a mechanism for closing at least a portion of the exhaust path 12 when the gas burner 10 is extinguished.

Description

  The present invention relates to a liquid tank heating apparatus that heats a liquid tank using a gas.

  Conventionally, liquid tank heating devices such as a fryer, a kettle, and a water bath are known. This liquid tank heating device has a structure in which liquid such as edible oil or hot water is contained in a liquid tank, and a gas burner is ignited in the gas combustion chamber to heat the liquid in the liquid tank by this heat (Patent Document 1). Etc.). An exhaust path is communicated with the gas combustion chamber, and combustion exhaust gas generated in the gas combustion chamber is discharged to the external space through the exhaust path.

JP 2003-130339 A

  In the liquid tank heating apparatus described above, a structure with high heating efficiency has been adopted in recent years, and when the gas burner in the gas combustion chamber is extinguished once, the temperature of the liquid in the liquid tank is likely to drop rapidly. It has become.

  When the temperature of the liquid in the liquid tank is rapidly lowered, the following problem occurs. That is, for example, when the liquid tank heating device is in a standby state until the next use, if the temperature of the liquid suddenly decreases during this standby, there is a problem that it takes time and combustion costs to reach the target temperature at the next use. If the temperature of the liquid suddenly drops when the gas burner is extinguished when the liquid tank heating device has a temperature adjustment function, it is necessary to frequently ignite / extinguish the gas burner in order to keep the liquid at the target temperature. It is a problem that there is.

  This invention is invented in view of the said problem, Comprising: The subject which proposes the liquid tank heating apparatus which can suppress the liquid temperature fall in a liquid tank when the gas burner of a gas combustion chamber is extinguished as much as possible And

  In order to solve the above problems, the present invention is a liquid tank heating device having the following configuration.

  That is, the present invention includes a liquid tank, a gas combustion chamber provided with a gas burner for heating the liquid tank, an exhaust path for discharging combustion exhaust gas from the gas combustion chamber to an external space, and the exhaust path. An opening / closing mechanism arranged, and the opening / closing mechanism is a mechanism for closing at least a part of the exhaust passage when the gas burner is extinguished.

  In the present invention, it is preferable that the opening / closing mechanism is a mechanism that operates the opening / closing lid using a shape memory alloy that operates in accordance with a heat fluctuation in the exhaust passage.

  In the present invention, it is also preferable that the opening / closing mechanism is a mechanism that operates the opening / closing lid using a bimetal that operates according to a heat fluctuation in the exhaust passage.

  In the present invention, it is also preferable that the opening / closing mechanism is a mechanism using an opening / closing lid that is balanced so as to operate according to pressure fluctuations in the exhaust passage.

  The present invention has an effect that the temperature drop in the liquid tank when the gas burner in the gas combustion chamber is extinguished can be suppressed as much as possible.

It is a schematic sectional drawing of the liquid tank heating apparatus of 1st embodiment of this invention. It is a schematic perspective view which shows the opening / closing mechanism of a liquid tank heating apparatus same as the above. It is a schematic sectional drawing which shows the opening / closing mechanism of a liquid tank heating apparatus same as the above, (a) is in the state where the opening / closing lid was closed, (b) is the state where the opening / closing lid was opened. It is a schematic perspective view which shows the opening / closing mechanism of the liquid tank heating apparatus of 2nd embodiment of this invention. It is a schematic sectional drawing which shows the opening / closing mechanism of the liquid tank heating apparatus of 3rd embodiment of this invention.

  The present invention will be described based on embodiments shown in the accompanying drawings.

  1 to 3 show a liquid tank heating apparatus according to a first embodiment of the present invention.

  As shown in FIG. 1, the liquid tank heating apparatus of this embodiment includes a liquid tank 4 in which liquid L such as edible oil and hot water is stored, a gas combustion chamber 6 for heating the liquid tank 4 and a dip tube 8. I have. The gas combustion chamber 6 has an indoor space in which a gas burner 10 is disposed, and a dip tube 8 communicating with the indoor space extends in the horizontal direction.

  The dip tube 8 is disposed so as to penetrate the lower part of the liquid tank 4, and a cylindrical exhaust passage 12 extends upward from a tip portion thereof. The exhaust path 12 discharges combustion exhaust gas generated in the gas combustion chamber 6 as the gas burner 10 burns to the external space.

  The liquid tank heating device of this embodiment includes an opening / closing mechanism 14 for adjusting the opening / closing degree of the exhaust passage 12 according to the degree of combustion of the gas burner 10 in the gas combustion chamber 6. As shown in FIGS. 2 and 3, the opening / closing mechanism 14 includes an opening / closing lid 16 that is rotatably supported on the inner wall of the exhaust passage 12, and a plurality of actuator members 18 for driving the opening / closing lid 16 to open and close. And have.

  The actuator member 18 is a plate-like member that is bent and formed in a substantially letter shape using a shape memory alloy, and is provided so that the bending angle α is changed according to thermal fluctuation. Specifically, the bending angle α of the actuator member 18 is set to the extent shown in FIG. 3B at a predetermined high temperature when the gas burner 10 is burned in the gas combustion chamber 6. When the gas burner 10 is extinguished and the temperature is lowered, the bending angle of the actuator member 18 is set so as to increase to the extent shown in FIG.

  Thereby, while ensuring the exhaust path when the gas burner 10 is burned in the gas combustion chamber 6, when the gas burner 10 is extinguished, a part or all of the exhaust path is closed, so that The temperature drop in the pipe 8 can be suppressed, and consequently the temperature drop of the liquid L stored in the liquid tank 4 can be suppressed.

  Therefore, according to the liquid tank heating device of the present embodiment, when the gas burner 10 is extinguished once and made to stand by and then used again, the time for re-raising the liquid L in the liquid tank 4 to the target temperature. And combustion costs are reduced.

  Further, when the liquid tank heating device of the present embodiment has a temperature adjustment function, the temperature drop of the liquid L when the gas burner 10 is extinguished can be suppressed. Therefore, the number of times the gas burner 10 is ignited / extinguished is determined. It can be reduced and contributes to improving the durability of the equipment.

  And since the actuator member 18 for this is formed using the shape memory alloy so that it may operate | move automatically according to the heat fluctuation in the exhaust passage 12, it is not necessary to use electricity, and it is also at the time of a power failure Can be used. As a modification of the present embodiment, a structure in which a plurality of opening / closing lids 16 are provided, or a structure in which the opening / closing lid 16 itself is formed of a shape memory alloy can be employed.

  Next, the liquid tank heating apparatus of 2nd embodiment of this invention is demonstrated. In addition, detailed description is abbreviate | omitted about the structure similar to 1st embodiment among the structures of this embodiment, and the structure different from 1st embodiment is explained in full detail below.

  FIG. 4 shows an opening / closing mechanism 14 included in the liquid tank heating device of the present embodiment. The opening / closing mechanism 14 is installed on the inner wall of the exhaust passage 12 and includes a plurality of opening / closing lids 16. In the opening / closing mechanism 14 of this embodiment, an actuator member 20 made of bimetal is used as means for driving the plurality of opening / closing lids 16.

  The actuator member 20 is bent and formed in a substantially square shape, and is set so as to change its bending angle according to thermal fluctuation. Specifically, the bending angle β of the actuator member 20 is small when the temperature is high, and the bending angle β is set to increase as the temperature decreases.

  In the present embodiment, in order to integrally drive a plurality of opening / closing lids 16 arranged in parallel, the front end portions of the respective opening / closing lids 16 are connected to a common driving rod 22, and one end side and the other end side of the driving rod 22 are connected. The actuator members 20 each made of bimetal are connected.

  Therefore, at a predetermined high temperature when the gas burner 10 is burned in the gas combustion chamber 6, the bending angle β of the actuator members 20 on both sides becomes small, and all the opening / closing lids 16 are connected to the exhaust passage 12 via the drive rod 22. Is held in the open posture to release the. When the temperature is lowered by extinguishing the gas burner 10, the bending angle β of the actuator members 20 on both sides is increased, and all the opening / closing lids 16 are held in a closed posture that blocks the exhaust passage 12 via the drive rod 22.

  Thereby, while ensuring the exhaust path when the gas burner 10 is burned in the gas combustion chamber 6, when the gas burner 10 is extinguished, a part or all of the exhaust path is closed and the liquid stored in the liquid tank 4 is stored. The temperature drop of L can be suppressed. Therefore, the time and the combustion cost for raising the liquid L in the liquid tank 4 again to the target temperature can be suppressed, and the number of times the gas burner 10 is repeatedly ignited / extinguished by the temperature adjustment function can be suppressed. And since the actuator member 20 for this is formed using the bimetal so that it may operate | move automatically according to the heat fluctuation in the exhaust path 12, it does not need to use electricity and can be used also at the time of a power failure It becomes.

  As a modification of the present embodiment, a structure in which a bimetal actuator member 20 is connected to each opening / closing lid 16 or a structure in which the opening / closing lid 16 itself is formed of bimetal can be employed. Moreover, the opening / closing lid 16 may be single.

  Next, the liquid tank heating apparatus of 3rd embodiment of this invention is demonstrated. In addition, detailed description is abbreviate | omitted about the structure similar to 1st embodiment among the structures of this embodiment, and the structure different from 1st embodiment is explained in full detail below.

  FIG. 5 shows an opening / closing mechanism 14 included in the liquid tank heating device of the present embodiment. The opening / closing mechanism 14 is installed in the exhaust passage 12 and includes an opening / closing lid 16 that opens and closes an exhaust passage for combustion exhaust gas so as to be rotatable around a support shaft 24. A pair of arms 26 extends downward from the opening / closing lid 16, and a weight 28 is fixed to the tip of each arm 26. Further, a tension spring 30 is connected to the opening / closing lid 16.

  The opening / closing lid 16 has a total balance so that it is held in the illustrated inclined posture when there is no flow of combustion exhaust gas in the exhaust passage 12 due to the gravity acting on the arm 26 and the weight 28 and the spring force applied by the tension spring 30. Has been taken. The opening / closing lid 16 blocks a part of the exhaust passage 12 and suppresses the temperature drop of the liquid tank 4 when in the illustrated inclined posture.

  On the other hand, when the gas burner 10 is combusted in the gas combustion chamber 6, the pressure of the combustion exhaust gas flowing in the exhaust passage 12 causes the opening / closing lid 16 that is in the inclined posture to turn to the standing posture, and the exhaust passage 12 is fully opened. To keep. When the gas burner 10 is extinguished, the exhaust pressure in the exhaust passage 12 disappears, so that it automatically returns to the illustrated inclined posture.

  Thus, the center of gravity balance is set so that the opening / closing lid 16 of the present embodiment opens and closes according to the pressure fluctuation in the exhaust passage 12, whereby the exhaust path when the gas burner 10 is burned is set. While ensuring, when the gas burner 10 is extinguished, a part of the exhaust path is blocked, and the temperature drop of the liquid L stored in the liquid tank 4 can be suppressed. Therefore, the time and the combustion cost for raising the liquid L in the liquid tank 4 to the target temperature again can be suppressed, and the repetition number of times of ignition / extinguishing of the gas burner 10 by the temperature adjustment function can be suppressed. And it is not necessary to use electricity to operate the opening / closing lid 16, and it can be used even during a power failure.

  In the present embodiment, the opening / closing lid 16 is provided so as to close a part of the exhaust passage 12 when balanced in an inclined posture, but may be provided so as to close the whole. In addition, the tension spring 30 may not be provided, but in this case, the inclination of the opening / closing lid 16 in a balanced state is set to a smaller angle than in the illustrated case.

  As described above with reference to the drawings, the liquid tank heating apparatus according to the first to third embodiments of the present invention includes the liquid tank 4 and the gas combustion chamber 6 provided with the gas burner 10 for heating the liquid tank 4. And an exhaust passage 12 for discharging the combustion exhaust gas from the gas combustion chamber 6 to the external space, and an opening / closing mechanism 14 disposed in the exhaust passage 12. The opening / closing mechanism 14 is a mechanism that closes at least a part of the exhaust passage 12 when the gas burner 10 is extinguished.

  By providing this opening / closing mechanism 14, the temperature drop of the liquid L in the liquid tank 4 when the gas burner 10 of the gas combustion chamber 6 is extinguished is suppressed as much as possible. Therefore, it is possible to effectively reduce the time and combustion cost for causing the liquid L to reach the target temperature again during use. Moreover, the frequency of repeating the ignition / extinguishing of the gas burner 10 for temperature adjustment can also be effectively suppressed.

  In the liquid tank heating apparatus of the first embodiment, the opening / closing mechanism 14 is a mechanism for operating the opening / closing lid 16 using a shape memory alloy that operates according to thermal fluctuations in the exhaust passage 12. Therefore, the opening / closing lid 16 operates accurately according to the state of combustion in the gas combustion chamber 6, and since electricity is unnecessary, it can be used even during a power failure.

  Moreover, in the liquid tank heating apparatus of the second embodiment, the opening / closing mechanism 14 is a mechanism that operates the opening / closing lid 16 using a bimetal that operates according to heat fluctuation in the exhaust passage 12. Therefore, the opening / closing lid 16 operates accurately according to the state of combustion in the gas combustion chamber 6, and since electricity is unnecessary, it can be used even during a power failure.

  In the liquid tank heating apparatus of the third embodiment, the opening / closing mechanism 14 is a mechanism using an opening / closing lid 16 that is balanced so as to operate according to pressure fluctuations in the exhaust passage 12. Therefore, the opening / closing lid 16 operates accurately according to the state of combustion in the gas combustion chamber 6, and since electricity is unnecessary, it can be used even during a power failure.

  As mentioned above, although this invention was demonstrated based on embodiment shown to an accompanying drawing, this invention is not limited to embodiment of each said example, For example, the structure which drives the opening-and-closing lid | cover 16 with an electric motor is mentioned. You may use. With respect to other configurations, as long as they are within the range intended by the present invention, it is possible to make appropriate design changes in each example, and to apply the configurations of each example in combination as appropriate.

4 Liquid tank 6 Gas combustion chamber 10 Gas burner 12 Exhaust passage 14 Opening / closing mechanism 16 Opening / closing lid

Claims (4)

  A liquid tank, a gas combustion chamber provided with a gas burner for heating the liquid tank, an exhaust path for discharging combustion exhaust gas from the gas combustion chamber to an external space, and an open / close mechanism disposed in the exhaust path And the opening / closing mechanism is a mechanism for closing at least a part of the exhaust passage when the gas burner is extinguished.   The liquid tank heating apparatus according to claim 1, wherein the opening / closing mechanism is a mechanism that operates the opening / closing lid using a shape memory alloy that operates in accordance with a heat fluctuation in the exhaust passage.   The liquid tank heating apparatus according to claim 1, wherein the opening / closing mechanism is a mechanism that operates the opening / closing lid using a bimetal that operates according to a heat fluctuation in the exhaust passage.   The liquid tank heating apparatus according to claim 1, wherein the opening / closing mechanism is a mechanism using an opening / closing lid that is balanced so as to operate according to pressure fluctuation in the exhaust passage.

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