JP5080398B2 - Liquid tank heating device - Google Patents

Description

  The present invention belongs to the technical field of a heating apparatus that heats a liquid to be heated stored in a liquid tank having an upper surface opening, and particularly relates to a liquid tank heating apparatus used in a boiled noodle device, which is a commercial kitchen device.

  Conventionally, liquid bath heating devices that have been widely used as commercial noodle bowls that boil noodles such as udon, ramen, spaghetti, etc. Is stored and boiled, and the noodle cake is put in a hot water tank or directly, and the noodles are added directly and boiled. The hot water bath is heated directly or by heat exchange with a heating medium (for example, hot gas or hot oil) using gas or electricity as a heat source.

  As a heating device by this heat exchange, for example, the title of the invention cited as Patent Document 1 “a heat exchange device for a hot water tank for cooking” is disclosed. This device arranges a heat exchange unit at the bottom of a box-shaped hot water bath that is open upward so as to protrude in the longitudinal direction of the hot water bath, and stores the water in the hot water bath by heat exchange that introduces a heating gas by a burner into the heat exchange unit. Is heated and kept warm. And the copper fins which were rich in heat conductivity are arrange | positioned inside the said heat exchange unit.

  Since the apparatus has a heat source for each heat exchange unit, there is a problem in that the running cost increases and the heat exchange efficiency decreases when the number of heat sources is reduced. Moreover, since the heat exchange unit is arranged in parallel with the liquid tank in one direction, there is a problem that uniform liquid heating is insufficient.

  In addition, the title “Liquid Heating Device” of the invention cited as Patent Document 2 has a plurality of cylindrical exhaust pipes that introduce a heated gas for heat exchange in the longitudinal direction in the liquid tank. In the exhaust pipe, copper fins are integrally disposed. In particular, the fin is characterized in that its heat transfer area is set according to the temperature gradient in the longitudinal direction of the exhaust pipe.

  Furthermore, the title “Liquid Heating Device” cited as Patent Document 3 is a modification of the fin shape disclosed in Patent Document 2 above. In addition to the heat transfer area being set according to the temperature gradient in the longitudinal direction of the exhaust pipe, the fins of this liquid heating device are provided with guiding means for directing the combustion gas flowing in the exhaust to the lower side It is characterized by.

In these liquid heating devices of Patent Documents 2 and 3, the combustion chamber is disposed so as to be biased to one side with respect to the liquid tank, and the exhaust passage from which the combustion gas from the combustion chamber extends toward the other side of the liquid tank It is the structure which distributes. For this reason, there is a problem in that the exhaust gas resistance is increased because the flow path of the combustion gas becomes longer and the exhaust cross-sectional area is smaller and the exhaust passage is disposed horizontally on the bottom side of the liquid tank. As a result, there is a problem that the combustion efficiency of the heat source decreases and the heat exchange efficiency for liquid heating decreases. In addition, since the exhaust path is long, a temperature difference due to the thermal gradient between the heat source side and the end side is generated, resulting in variations in the heating of the liquid, and there is a limit to the adjustment of the fin length and shape disposed inside. .
JP 2005-218741 (page 3-4, FIG. 2) JP 2000-157425 (page 3-5, FIG. 2, FIG. 5) JP 2001-275852 (Pages 3-6, FIGS. 2, 4)

  As described above, in any configuration of the conventional disclosed technique, the supply of the hot gas from the heat source is configured to circulate from the one end portion to the other end portion of the heat exchange pipe. For this reason, the temperature gradient of the heat exchange pipe is increased, and a large difference occurs in the exchange temperature between the supply side and the exhaust side. This also affected the temperature distribution in the liquid tank, which was an obstacle to the formation of a uniform boiling state over the entire surface of the molten metal. As a result, in boiled noodle cooking by adding noodle bowls, the so-called “boiled unevenness” due to the place of addition occurs, which affects the taste of the noodle cooking products, which is an obstacle to the operation of the noodle dishes. It was.

  Therefore, the present invention has been made paying attention to the above-mentioned problems, and is intended to enable uniform heating in the liquid tank and to improve the heat exchange efficiency, and in addition to the exhaust resistance of the heat source. The liquid tank heating device aiming at reducing the temperature is also provided.

In order to solve the above problems, the liquid tank heating apparatus of the present invention employs the following configuration.
That is, a liquid tank for storing a liquid to be heated (hereinafter abbreviated as “liquid”) and a central part of the bottom part of the liquid tank or an intermediate part between the opposite side surfaces, and hot gas is provided inside the liquid tank. A chamber to be filled, a heat exchange pipe that is piped in a substantially horizontal direction from the chamber toward both side walls in the liquid tank and communicated with an exhaust passage, and an internal arrangement or an external arrangement for supplying hot gas into the chamber It is characterized by comprising a heat source. The heat source, such as a gas burner, is preferably arranged inside the chamber in consideration of the temperature drop of the hot gas and the compact design of the entire apparatus. In addition, the heat exchange pipe that is piped from the chamber is characterized by a pair of pipes that are of equal length and that are piped in opposite directions inside the liquid tank.

  With such a configuration, the hot gas filled in the chamber circulates so as to uniformly cover the entire bottom side of the liquid tank through a plurality of heat exchange pipes that are paired starting from the chamber. Through the circulation of the hot gas, heat exchange with the liquid inside the liquid tank is performed.

  As a suitable shape of the chamber and the heat exchange pipe, the chamber is formed in a substantially bowl shape projecting in a mountain shape from the bottom of the liquid tank, and an equal-length heat exchange pipe that is paired with an inclined surface symmetric with the ridge line of the bowl is piped It is a form to do. In such a form, the connection opening between the inclined surface of the chamber and the heat exchange pipe has a shape in which the cross-sectional area is larger than the cross-sectional area of the heat exchange pipe and is inclined downward. Due to the shape of the connection opening, the hot gas acting on the rising pressure is smoothly introduced from the chamber to the inside of the heat exchange pipe, and the length of the heat exchange pipe at the connection opening is also high in the liquid tank with high thermal energy. The upper side is longer than the lower side. In addition to this, it is also possible to adopt a form in which the chamber is formed in a dome-like shape at the center of the bottom of the liquid tank and the heat exchange pipe is piped so as to extend in four directions from the inclined portion of the chamber.

  Further, the exhaust passage communicating with the heat exchange pipe is arranged so as to surround the outer surface of the liquid tank. The exhaust path may not only communicate with the heat exchange pipe but also communicate with a part of the chamber, for example, the end side having a bowl shape. With this configuration, the hot gas circulates on the side surface side of the liquid tank in addition to the bottom surface side of the liquid tank.

  Furthermore, a plurality of heat exchange fins are disposed along the pipe extension direction inside the heat exchange pipe. The fin is characterized in that the contact area with the hot gas is arranged so as to be larger toward the upper region than the lower region in the pipe.

  As a more specific arrangement form of the fins, the fins are formed in a band plate shape and gradually become longer toward the upper part of the liquid tank. If the heat exchange pipe is piped on the inclined surface of the chamber as described above, the heat exchange pipe becomes longer on the upper side of the liquid tank.

  Further, the fins may be disposed so as to shorten the plate width on the chamber side. In the form of such fins, the heat transfer area of the fin on the chamber side having a high temperature is set small according to the temperature gradient of the hot gas in the heat exchange pipe, and the heat transfer area on the side opposite to the chamber having a low temperature is set large. As a result, the heat energy becomes more uniform over the entire length of the heat exchange pipe.

  Furthermore, you may expose a part of fin outside the heat exchange pipe. This fin enables direct heat transfer to the liquid without using a heat exchange pipe. Since the fin to be exposed is usually made of copper, it is preferable that the surface is plated in consideration of rust or the like.

Since the liquid tank heating device according to the present invention has the above-described configuration, the following effects can be obtained.
First, the chamber is arranged at the bottom of the liquid tank, and a plurality of heat exchange pipes are arranged in pairs toward the side walls in the liquid tank with this chamber as a base point. It is the structure which encloses the outer side of a tank. For this reason, the cross-sectional area for the liquid stored in the liquid tank to absorb heat from the hot gas increases, and the flow direction also becomes a plurality of paths surrounding the bottom and side surfaces of the liquid tank, improving the heat exchange efficiency for the entire liquid tank and the liquid The liquid in the tank can be heated uniformly.

  Moreover, as a result of increasing the cross-sectional area of the heat exchange pipe and a plurality of hot gas flow paths, the exhaust resistance of the hot gas is also reduced, so that the combustion efficiency of the heat source is improved. As a result, this contributes to the improvement of the heat exchange efficiency and also exhibits the effect of reducing the running cost of the entire apparatus.

  In the liquid tank heating device of the present invention, the length of the fins arranged inside each heat exchange pipe is set such that the liquid tank upper region side is longer than the lower region side, so that the higher temperature side in the heat exchange pipe The heat exchange efficiency of the single heat exchange pipe is improved. Furthermore, when the heat transfer area of the fin is changed on the chamber side and the exhaust path side of the heat exchange pipe, the temperature gradient is more uniform over the entire length of the heat exchange pipe, resulting in uniform thermal energy. Contributes to uniform heating of the liquid in the liquid tank. In addition, when a part of the fin of this form is exposed from the heat exchange pipe, the fin becomes a direct medium for heat exchange, which also contributes to improvement of heat exchange efficiency.

  Hereinafter, the best embodiment of a liquid tank heating device (hereinafter abbreviated as “this device”) according to the present invention will be described in detail with reference to the drawings.

  1 is a partially cutaway perspective view showing the overall appearance of the apparatus, FIGS. 2 and 3 are partially cutaway perspective views showing the main part of the apparatus, and FIG. 4 is a front view of the main part. FIG. 5 is a perspective view (A) and a cross-sectional view (B) showing a modification of the fin of the present apparatus.

  This apparatus 1 heats and boiles the liquid stored in the liquid tank, mainly water, produces | generates hot water, and boiles noodles etc. with the hot water. The apparatus 1 includes a frame 2 that maintains the rigidity of the entire apparatus, and a main portion 3 held by the frame 2.

  As shown in FIG. 1, the frame 2 is provided with four legs 21 supporting the entire apparatus on the lower side, and the upper board 22 is opened and the main part 3 is attached and held inside. The exhaust port 23 is erected from the end portion side of 22. The frame 2 is not the main point of the present invention, but is appropriately constructed from a metal having a dustproof property, such as stainless steel, as in the prior art.

  Next, the main part 3 which is the main point of the present invention will be described in detail. The main part 3 is disposed on the bottom side of the liquid tank 4 for storing a predetermined amount of water or hot water, and the chamber 5 is separated from the liquid tank 4 in a watertight manner and filled with hot gas. A plurality of heat exchange pipes 6 piped to the chamber 5 and an exhaust path 7 that communicates with the chamber 5 and the heat exchange pipe 6 and exhausts hot gas to the outside of the apparatus.

  First, the liquid tank 4 has a box shape with an upper opening, and can store a predetermined amount of water or hot water. The liquid tank 4 of the present embodiment is made of a stainless steel material and has an opening area and a depth at which a plurality of noodle bowls storing noodles can be suspended.

  The chamber 5 protrudes in a mountain shape from the bottom of the liquid tank so as to form a substantially triangular shape with an acute angle when viewed in cross section, and extends along the middle of the opposing wall surface of the bottom of the liquid tank 4 with such a cross-sectional shape. It is formed in a bowl shape having an inclined surface 51. The chamber 5 closes one end surface in the longitudinal direction protruding to the liquid tank side, and communicates the other end surface with an exhaust passage 7 described later. A gas burner 52 serving as a heat source for supplying hot gas is disposed along the longitudinal direction of the chamber 5. Hot gas is generated by the combustion of the gas burner 52. A plurality of fire sources of the gas burner 52 are arranged at equal intervals over the longitudinal direction of the chamber 5 without being biased to one side.

  The chamber 5 is provided with a plurality of heat exchange pipes 6 having the same length communicating with the interior thereof. The heat exchange pipe 6 has a rectangular cross section with a long vertical side, and is connected to the inclined surface 51 of the chamber 5. Moreover, while being orthogonal to the longitudinal direction which comprises a bowl shape, it is piping substantially horizontally toward the both-sides wall surface in a liquid tank. The heat exchanging pipe 6 of this embodiment is provided with the appearance of an external branching from the chamber 5 to the left and right, that is, a total of 10 pairs of 5 pairs of equal lengths on the left and right sides with the center line in the longitudinal direction of the chamber 5 symmetrical. The extended end side of the exchange pipe 6 communicates with an exhaust path 7 described later. Further, since the heat exchange pipe 6 having the above configuration is connected to the inclined surface 51 of the chamber 5, the cross-sectional area of the connection opening 61 with the chamber 5 is larger than the cross-sectional area of the heat exchange pipe 6, and The pipe length is longer in the upper side than in the lower side in a side view.

  Inside each heat exchange pipe 6, copper strip-like fins 62 fixed by brazing, seam welding, high frequency welding or the like are arranged along the pipe extending direction. The fins 62 are formed by projecting a plurality of U-shaped cross sections from both side surfaces inside the heat exchange pipe 6 toward the center side. The length of the fin 62 is set so as to gradually increase from the lower region to the upper region, following the shape of the side surface of the heat exchange pipe 6. In other words, the contact area of the fins 62 arranged in the lower region in the heat exchange pipe with the hot gas increases toward the upper region.

  Due to the arrangement of the fins 62, mixing of the hot gas in the upper region and the lower region is suppressed in the heat exchange pipe, and heat having a higher temperature can be recovered by the fins 62 disposed in the upper region. Note that the length of the fins 62 is not limited to the present embodiment, and all the fins 62 may be set to the same length in consideration of the manufacturing cost.

  If necessary, the fin 62 may be a deformed fin 63 in which the plate width toward the center of the heat exchange pipe 6 is set in two stages with the chamber side being narrow and the exhaust path side being wide, as shown in FIG. In addition, the heat transfer area becomes wider from the chamber side toward the exhaust path side, for example, according to the temperature gradient in the longitudinal direction of the heat exchange pipe 6, so that the heat energy becomes more uniform over the entire pipe length, You may set so that the width | variety may change gradually.

  Further, in addition to the above configuration, the fin 62 may be provided with an exposed fin 64 in which a part thereof is exposed from the upper end surface of the heat exchange pipe 6 as shown in FIG. The exposed fins 64 are set so that the cross-sectional area of the portion in the heat exchange pipe is larger than the cross-sectional area of the exposed portion. Note that the exposed portion is preferably surface-treated by plating or the like in consideration of adhesion of patina or the like. Further, as shown in FIGS. 2 and 3, the exposed fin 64 may be added to a specific heat exchange pipe 6 so as to adjust the heat exchange efficiency in that region.

  In addition, regarding the concrete construction of the bowl-shaped portion protruding to the liquid tank side of the chamber 5 and the heat exchange pipe 6 connected thereto, an exhaust passage which will be described later is formed by welding from a metal such as stainless steel having dustproofness. 7 is also fixed by welding. Alternatively, the chamber 5 and the plurality of heat exchange pipes 6 may be integrally formed of an aluminum casting or the like, and may be configured to be watertightly fixed via the bottom of the liquid tank or the exhaust path 7 and packing. The whole main part including the path 7 may be formed integrally with an aluminum casting. Further, the entire chamber 5 and the heat exchange pipe 6 may be made of a plated copper material in consideration of heat exchange.

One end surface of the chamber 5 configured as described above and the end side of all the heat exchange pipes 6 communicate with the exhaust path 7. The exhaust passage 7 surrounds both wall surfaces of the liquid tank 4 parallel to the longitudinal direction side of the chamber 5 from both sides, and includes two side passages 71 communicating with the end side of each heat exchange pipe 6, and two side passages 71. A central path 72 that joins and communicates with the other end surface of the chamber 5 is formed. The exhaust passage 7 has a substantially U-shape when viewed from above and covers the outer surface of the liquid tank 4 so as to surround three surfaces, and the central passage 72 communicates with the exhaust port 23 of the frame 2. .
[Action]

Next, the operation of the apparatus 1 having the above configuration will be described below.
First, after storing a predetermined amount of water in the liquid tank 4, the gas burner 52 which is a heat source in the chamber is burned. The hot gas generated by the combustion of the gas burner 52 flows through the heat exchange pipe 6 and the side passage 71 of the exhaust passage 7 and the inside of the central passage 72 (arrow a), and is then exhausted to the outside from the exhaust port 23 of the frame 2. (Arrow b).

  By the above hot gas circulation process, the water in the chamber 5, the heat exchange pipe 6, the exhaust path 7 and the liquid tank adjacent to the chamber 5 is heated by heat exchange to produce boiling water, and after the hot water is generated The boiling state is maintained. In the process of circulating the hot gas, the chamber 5 and the heat exchange pipe 6 branched from the chamber 5 are provided so as to substantially cover the entire area of the bottom surface of the liquid tank. Heating will be performed. Further, since the exhaust path 7 communicating with the chamber 5 and the heat exchange pipe 6 is disposed so as to surround the outer peripheral surface of the liquid tank 4, heating is also performed from the side surface side of the liquid tank 4. Become. In particular, the heating from the exhaust passage 7 is suitable for maintaining the boiling state after the hot water is generated, and greatly contributes to the improvement of the heat exchange efficiency.

  With regard to the individual heat exchange pipe 6, since the upper region is long and the lower region is short in the connection opening with the chamber 5, higher heat energy can be recovered by the long fins 62 arranged on the upper side. . That is, the improvement of the heat exchange efficiency of such a heat exchange pipe alone contributes to the improvement of the heat exchange efficiency of the entire apparatus. Further, the heat exchange pipe 6 may be further improved in heat exchange efficiency by changing the fins 62 to deformed fins 63 or adding exposed fins 64 as necessary.

  In the circulation of the hot gas in the entire apparatus, since there are a plurality of circulation paths of the hot gas so as to surround the bottom side and the lower side of the liquid tank 4, the cross-sectional area of the exhaust path of the hot gas increases and the exhaust resistance decreases. ing. Further, since the heat exchange pipe 6 is connected to the inclined surface 51 of the chamber 5, the connection opening 61 is inclined downward and becomes larger than the cross-sectional area of the heat exchange pipe, and the rising pressure of the hot gas is increased in the heat exchange pipe. Therefore, the exhaust resistance is reduced. Such a decrease in the exhaust resistance contributes to the acceleration of combustion of the gas burner 52 of the chamber 5 and the improvement of the combustion efficiency, and also greatly contributes to the improvement of the heat exchange efficiency of the entire apparatus.

It is a partially cutaway perspective view showing the overall appearance of the present apparatus. It is a partially cutaway perspective view which shows the principal part of this apparatus. It is a partially cutaway perspective view which shows the principal part of this apparatus. It is sectional drawing from the front direction of the principal part. They are the perspective view (A) and sectional drawing (B) which show the modification of the fin of this apparatus.

Explanation of symbols

1 Device 2 Frame 21 Leg 22 Upper panel 23 Exhaust port 3 Main part 4 Liquid tank 5 Chamber 51 Inclined surface 52 Gas burner 6 Heat exchange pipe 61 Connection opening 62 Fin 63 Deformed fin 64 Exposed fin 7 Exhaust path 71 Side path 72 Central road

Claims (6)

A liquid tank for storing the liquid to be heated;
A chamber that is formed and arranged in a bowl shape that protrudes in a mountain shape from the center of the bottom of the liquid tank or in the middle of the opposite side surface and from the bottom of the liquid tank, and is filled with hot gas inside,
A heat exchange pipe communicated with the exhaust passage to the pipe in a substantially horizontal direction respectively toward the inclined surface positioned on both sides on both sides walls of the liquid tank from ridge ridges of the chamber,
An internal or external heat source for supplying hot gas into the chamber;
A liquid tank heating device comprising: The liquid tank heating apparatus according to claim 1, wherein an exhaust passage communicating with the heat exchange pipe is disposed so as to surround an outer surface of the liquid tank.   While arranging a plurality of heat exchange fins along the pipe extension direction inside the heat exchange pipe,
  The liquid tank heating apparatus according to claim 1 or 2, wherein a contact area between the fin and the hot gas is arranged so as to be larger toward a higher region than a lower region in the pipe. The fins arranged in the heat exchange pipe are formed in a strip shape and arranged along the pipe extending direction, and the fins are arranged so that the length of the fins gradually increases toward the upper part of the liquid tank. The liquid tank heating device according to claim 3, wherein 4. The fin disposed in the heat exchange pipe is formed in a strip shape and disposed along the pipe extending direction, and the plate width of the fin is disposed so that the chamber side is shortened. Or 4. The tank heating device according to 4. 6. The liquid tank heating device according to claim 3, wherein a part of the fin is exposed to the outside from the heat exchange pipe.

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