JP6846975B2 - Liquid heating device - Google Patents

Description

The present invention relates to a liquid heating device provided with a heating chamber provided along the bottom of a liquid tank for storing liquid.

Conventionally, a so-called liquid heating device for heating oil in a liquid tank by passing a combustion gas supplied from a combustion device such as a burner through a heating chamber provided along the bottom of the liquid tank for storing oil. , A fryer that fries croquettes as an object to be cooked is known. From the viewpoint of improving thermal efficiency, the liquid heating device includes a heat exchanger that exchanges heat between the combustion exhaust gas after passing through the heating chamber and the combustion air supplied to the burner.
As a heating chamber of the liquid heating device, as shown in FIG. 4C, a burner 14 is provided at one end in the longitudinal direction of a substantially rectangular shape, and the exhaust gas E that has passed through the heating chamber is provided. A configuration is conceivable in which an exhaust port 15 leading to an exhaust passage is provided. However, in such a configuration, the combustion gas E flowing through the heating chamber is short-circuited from the burner 14 to the exhaust port 15 and guided, so that the oil in the liquid tank existing on the upper surface of the heating chamber is present. The heat of the combustion gas is difficult to transfer to, and high thermal efficiency cannot be expected. Further, since the combustion exhaust gas having a relatively high temperature (for example, a temperature exceeding 300 ° C.) is introduced into the heat exchanger, there is a problem that the heat exchanger is inevitably damaged by heat due to the high temperature combustion exhaust gas.

Therefore, in the document disclosed in Patent Document 1, as shown in FIG. 4D, the partition wall K is used to prevent the combustion gas E from the burner 14 to the exhaust port 15 from being short-circuited in the heating chamber. It has.
As shown below, the partition wall K of the technique disclosed in Patent Document 1 includes a central flow path R1, a first side flow path R2, a second side flow path R3, a third side flow path R4, and a first. 4 The side flow paths R5 are arranged so as to pass through each of them in the order described.
To add an explanation, the partition wall K is first of all in the longitudinal direction in the central flow path R1 located substantially in the center of the second direction X orthogonal to the first direction Y, which is the longitudinal direction from the burner 14 to the exhaust port 15. At Y, the combustion gas E is allowed to flow along the direction from the burner 14 side to the exhaust port 15 side (hereinafter, abbreviated as the normal flow direction). Next, the partition wall K guides the flow of the combustion gas E to the first side flow path R2 provided in the second direction X close to the central flow path R1 in the second direction X, and guides the first side flow path R2. In the path R2, the combustion gas E is allowed to flow along the direction from the exhaust port 15 side to the burner 14 side (hereinafter, abbreviated as the reverse flow direction) in the first direction Y. Next, the partition wall K has a form in which the flow of the combustion gas E is folded back, and a pair of partition walls K are provided in the second direction X close to the central flow path R1 with respect to the first side flow path R2. It is guided to the direction flow path R3, and the combustion gas E is allowed to flow in the second side flow path R3 along the normal flow direction in the first direction Y. Next, a pair of partition walls K are provided in the second direction X in a form in which the flow of the combustion gas E is folded back, in close proximity to the first side flow path R2 with respect to the second side flow path R3. It is guided to the third side flow path R4, and the combustion gas E is allowed to flow in the third side flow path R4 along the reverse flow direction in the first direction Y. Next, a pair of partition walls K are provided in the second direction X in a form in which the flow of the combustion gas E is folded back, in close proximity to the second side flow path R3 with respect to the third side flow path R4. It is guided to the fourth side flow path R5, and in the fourth side flow path R5, the combustion gas E is passed along the normal flow direction in the first direction Y, and then the combustion gas E is guided to the exhaust port 15. ..

As described above, the inventors of the technique disclosed in Patent Document 1 have provided the partition wall K so that the relatively high temperature combustion gas E is allowed to flow through the substantially central region in the second direction X of the heating chamber. Since the gradually lowered combustion gas E is gradually passed to the side in the second direction X of the heating chamber, the second direction X is considered to come into contact with the outside air outside the heating chamber and the amount of heat radiation is relatively large. It was thought that the thermal efficiency could be improved by suppressing the high-temperature combustion gas E from flowing through the lateral end region of the above.

Japanese Unexamined Patent Publication No. 2012-34963

In the technique disclosed in Patent Document 1, since the temperature of the combustion gas E passing through the side end region in the first direction Y is low, the heat dissipation loss in the side end region can be reduced. However, the central region became hot in the second direction X, the lateral region became cold, and the temperature gradient became large with respect to the oil temperature in the second direction X. Normally, in a fryer, an object to be heated such as a croquette is fried while flowing along the first direction Y, which is the longitudinal direction, but the temperature gradient is along the second direction X orthogonal to the first direction Y. When it becomes large, the oil temperature in the X-end region in the second direction is lower than that in the central region, and the temperature of the object to be heated in the end region decreases, so that there is room for improvement.

The liquid heating device of the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to maintain high thermal efficiency while preventing heat damage to the heat exchanger, and to obtain a temperature gradient in the first direction of the heating chamber. The point is to provide a liquid heating device that can be made smaller to expand the usable area.

The liquid heating device for achieving the above purpose is
It is a liquid heating device provided with a heating chamber provided along the bottom of a liquid tank for storing liquid, and its characteristic configuration is
A combustion gas introduction portion for introducing combustion gas into the heating chamber is arranged at one end in the first direction along the longitudinal direction of the bottom of the liquid tank, and the combustion gas in the heating chamber is located at the other end in the first direction. Is arranged to exhaust the gas to the outside,
A pair of first outer walls provided along the first direction are provided as side walls of the heating chamber.
In the heating chamber, only a plurality of flow path forming partition walls, which are connected to the bottom of the heating chamber and the bottom of the liquid tank and have partition wall surfaces along the second direction intersecting the first direction, are the first. It is provided by being distributed in one direction.
The plurality of flow path forming partition walls are a group of central region partition walls provided in the central region and one side outer wall of one of the pair of the first outer walls in a first directional view viewed along the first direction. It is composed of a one-sided region partition wall group provided in the vicinity and a other-side region partition wall group provided in the vicinity of the other side outer wall of the pair of the first outer walls.
In the first direction view, at least one of the flow path forming partition walls constituting the central region partition wall group is superposed on a part of at least one of the flow path forming partition walls forming the one side region partition wall group. At the same time, at least one of the flow path forming partition walls constituting the central region partition wall group is superposed on a part of at least one of the flow path forming partition walls forming the other side region partition wall group.
At least one of the flow path forming partition walls constituting the one side region partition wall group is connected to the one side outer wall, and at least one of the flow path forming partition walls forming the other side region partition wall group is said. Connected to the outer wall on the other side,
The plurality of flow path forming partition walls form a combustion gas flow path that allows the combustion gas introduced from the combustion gas introduction portion to flow and leads to the exhaust port .
In the first direction, the plurality of flow path forming partition walls are arranged so as to be closer to each other so as to be closer to the combustion gas introduction portion .

According to the above characteristic configuration, first, in the first direction view, at least one flow path forming partition wall constituting the central region partition wall group is a part of at least one flow path forming partition wall forming the one side region partition wall group. At least one flow path forming partition wall constituting the central region partition wall group is superposed on a part of at least one flow path forming partition wall forming the other side region partition wall group, and one side. At least one flow path forming partition wall constituting the region partition wall group is connected to one side outer wall, and at least one flow path forming partition wall forming the other side region partition wall group is connected to the other side outer wall. Therefore, at least in the first direction view from the side of the combustion gas introduction portion to the side of the exhaust port, a path through which the combustion gas E is short-circuited along the first direction is not formed.
As a result, the combustion gas does not short-circuit and flow from the side of the combustion gas introduction part to the side of the exhaust port, which accompanies a decrease in the efficiency of heat exchange between the combustion gas in the heating chamber and the liquid in the liquid tank. It is possible to prevent a decrease in thermal efficiency, and as the thermal efficiency is improved, the temperature of the combustion gas guided to the exhaust port can be reduced, and the temperature of the combustion exhaust gas flowing through the heat exchanger is relatively low (for example, about 300 ° C. or lower). ) To prevent heat damage to the heat exchanger.
Further, the inventors have conducted an actual measurement experiment and a simulation based on the configuration, and in the technique according to the present invention, the flow direction of the combustion gas as a whole in the first direction is simply changed from the combustion gas introduction portion to the exhaust port. It was found that the heat exchange efficiency can be improved because it is unidirectional.
To add an explanation, in the technique disclosed in Patent Document 1 as the prior art, as shown in the actual measurement experiment and the simulation result described later, the flow direction of the combustion gas as a whole in the first direction is as described above. Since the normal flow direction and the reverse flow direction can be switched multiple times, it is considered that the heat exchange efficiency is lowered due to the decrease in the flow velocity.
On the other hand, in the present invention, since the overall flow direction of the combustion gas in the first direction is a single direction from the combustion gas introduction portion to the exhaust port, it is not accompanied by a large decrease in flow velocity as in the prior art. It is considered that the heat exchange efficiency is enhanced by this.
Further, according to the above-mentioned feature configuration, the flow velocity of the combustion gas usually gradually decreases in the flow direction of the combustion gas from the upstream side to the downstream side of the heating chamber, but the above-mentioned feature configuration should be adopted. Therefore, since the change in the flow velocity of the combustion gas in the flow direction can be made small, relatively high thermal efficiency can be maintained over substantially the entire area in the flow direction.
As described above, according to the present invention, it is possible to prevent a short circuit of the flow of combustion gas from the combustion gas introduction portion to the exhaust port, improve thermal efficiency, and prevent thermal damage to the heat exchanger. It is possible to realize a liquid heating device capable of improving thermal efficiency by maintaining a flow velocity of a certain level or higher.

Further features of the liquid heating device
In the first direction, the flow path forming partition wall that is in close contact with the combustion gas introduction portion and the flow path forming partition wall that is in close contact with the exhaust port are located at a point forming the central region partition wall group.

According to the above characteristic configuration, at both ends in the first direction, the fuel gas can also flow through the lateral region in the second direction orthogonal to the first direction, and the temperature is locally low. Can be prevented from occurring, and the temperature can be made more uniform in a plan view.

Further features of the liquid heating device
The heating chamber has a line-symmetrical shape with respect to a line of symmetry that passes through a substantially central position in a second direction orthogonal to the first direction as well as along the first direction in a plan view.
The plurality of flow path forming partition walls are provided in a line-symmetrical shape with respect to the symmetric line in the plan view.

According to the above characteristic configuration, when the heating chamber is partitioned by a target line passing through a substantially central region in a second direction orthogonal to the first direction in a plan view, the heating chamber is approximately divided into one side region and the other side region. The combustion gas E can be passed through the target, and the temperature difference between the one-side region and the other-side region can be further reduced.

Further features of the liquid heating device
In the first direction, the flow path forming partition wall of the one side region partition wall group and the flow path of the other side region partition wall group are located between the flow path forming partition walls constituting the central region partition wall group, respectively. One forming partition wall is provided for each,
All the flow path forming partition walls constituting the central region partition wall group are arranged so as to overlap with a part of the flow path forming partition wall of the one side region partition wall group which is in close contact in the first direction in the first direction view. ,
All the flow path forming partition walls constituting the central region partition wall group are arranged so as to overlap with a part of the flow path forming partition wall of the other side region partition wall group which is in close contact in the first direction in the first direction view. ,
All of the flow path forming partition walls constituting the one side region partition wall group are connected to the one side outer wall, and all of the flow path forming partition walls forming the other side region partition wall group are connected to the other side. It is at the point where it is connected to the outer wall.

According to the above characteristic configuration, in the first direction, the combustion gas E is always guided by the nearest partition wall in the first direction after being guided along the specific partition wall. It is possible to prevent short circuits even better and improve thermal efficiency.

The liquid heating device of the present invention includes
A burner that generates combustion gas to the combustion gas introduction section is provided.
It is preferable that a heat exchanger is provided for heat exchange between the combustion air guided to the burner and the combustion exhaust gas discharged from the exhaust port by the combustion gas passing through the heating chamber.

Further, as the liquid heating device of the present invention,
It is preferable that the partition wall surfaces of the plurality of flow path forming partition walls are provided along the second direction orthogonal to the first direction.
As a result, the effects described so far are exhibited even better.

Longitudinal section of the flyer according to the embodiment II-II arrow diagram of the flyer in FIG. Figure III-III arrow of the flyer in FIG. Schematic configuration diagram of examples and comparative examples in which experiments and simulations were performed The figure which shows the simulation result about Example 1. The figure which shows the simulation result about Example 2. The figure which shows the simulation result about the comparative example 1. The figure which shows the simulation result about the comparative example 2.

The fryer 100 (an example of a liquid heating device) according to the embodiment of the present invention can maintain high thermal efficiency while preventing heat damage to the heat exchanger, and is used with a small temperature gradient in the first direction of the heating chamber. Regarding those that can expand the possible area.

Hereinafter, embodiments of the fryer 100 (corresponding to a liquid heating device) according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the fryer 100 has an oil tank 11 (corresponding to a liquid tank) in which the oil P is housed, and a heating arrangement arranged under the bottom plate 11a of the oil tank 11 to heat the oil P in the oil tank 11. It is configured to include a room 13. As shown in FIG. 2, the side circumference of the heating chamber 13 is orthogonal to the pair of first outer walls 12a and 12b arranged at both ends in the first direction (Y direction in the drawing) in the first direction. It is surrounded by a pair of second outer walls 12c and 12d arranged at both ends in the second direction (X direction in the drawing), the upper portion thereof is an oil tank bottom plate 11a, and the lower surface is surrounded by a bottom wall 10. It is composed of a space. Here, the heating chamber 13 is formed in, for example, a rectangular parallelepiped space, the lateral direction is the second direction (X direction in the figure) in a plan view, and the longitudinal direction is the first direction (FIG. (Middle Y direction). As a result, the heating chamber 13 is a space longer in the second direction than in the first direction.
For example, the longitudinal direction of the oil tank 11 is the transport direction of the object to be cooked, and the lateral direction of the oil tank 11 is the support direction of both ends of the object to be cooked.

The fryer 100 includes a burner 14 for generating combustion gas E, a combustion gas introduction unit for introducing the generated combustion gas E into the heating chamber 13, and exhausting the combustion gas E in the heating chamber 13 to the outside. The exhaust port 15 is provided, and the heating chamber 13 is provided with a combustion gas flow path that allows the combustion gas E generated in the burner 14 to pass through and leads to the exhaust port 15.
In this embodiment, since the flame is formed in the heating chamber 13 by the burner 14, the combustion gas introduction portion is the terminal portion and the peripheral portion of the flame formed by the burner 14. The burner 14 and the combustion gas introduction portion are arranged at one end of the heating chamber 13 in the first direction (Y direction in the drawing), and the exhaust port 15 is arranged at the other end of the heating chamber 13 in the first direction. The burner 14 and the exhaust port 15 are arranged so as to be opposite ends of the heating chamber 13 in the first direction.

(Burner)
A burner 14 is provided on one end side of the heating chamber 13 in the first direction (Y direction in the drawing), and a combustion gas introduction that causes the combustion gas E to be introduced into the heating chamber 13 in the space where the burner 14 is arranged. It is configured as a space. Fuel gas F and air A are supplied to the burner 14 by the fuel supply path 18 and the air supply path 19. The burner 14 is configured to freely eject combustion gas E upward from a plurality of injection holes 14a formed in the bottom wall 10 of the heating chamber 13, and the combustion gas E ejected upward thereof is ejected into the heating chamber. It is configured to be introduced in 13. The burner 14 is installed on the central side of the heating chamber 13 in the second direction (X direction in the drawing), and is configured to continuously generate combustion gas E in the second direction. That is, the burner 14 is arranged so that the central portion of the heating chamber 13 is centered in the second direction, and the length of the burner 14 in the second direction extends over substantially the entire length of the heating chamber 13. are doing. The burner 14 is configured to eject combustion gas E over the entire length of the burner 14 in the second direction to form a long flame in the second direction as a whole. As a result, the combustion gas introduction portion is formed over substantially the entire length of the heating chamber 13 in the second direction, and the combustion gas can be continuously introduced in the second direction.
The burner 14 is configured so that it can be automatically ignited by an ignition device (not shown), and after ignition, the thermal power can be adjusted by a thermal power adjusting device (not shown). Further, the thermal power adjusting device is also configured to be controllable by an oil temperature temperature adjusting device (not shown) provided in the fryer 100.

(exhaust port)
An exhaust port 15 for combustion gas E is provided on the other end side of the heating chamber 13 in the first direction (Y direction in the drawing). The exhaust port 15 is provided at the center of the second direction (X direction in the drawing) by opening the bottom wall 10 of the heating chamber 13 in a circular shape. Further, the combustion exhaust gas E discharged from the exhaust port 15 is guided to the heat exchanger 21 by the exhaust duct 22 in order to exchange heat with the combustion air A.

(Heat exchanger)
The combustion gas E discharged from the exhaust port 15 is introduced into the heat exchanger 21 by the exhaust duct 22. In the heat exchanger 21, heat exchange between the air A and the combustion gas E is performed, and the exhaust heat is recovered from the combustion gas E to heat the air A. The hot air A is used for combustion in the burner 14 through the air supply path 9.

By the way, in the fryer 100 according to the embodiment, in order to make the temperature gradient in the second direction (X direction in the figure) of the heating chamber 13 as gentle as possible and to improve the thermal efficiency, the heating chamber 13 is described as follows. Flow path formation A partition wall is arranged to form a combustion gas flow path.
That is, in the heating chamber 13, the bottom wall 10 of the heating chamber 13 and the oil tank bottom plate 11a of the oil tank 11 are connected, and the second direction (X direction in the figure) intersecting the first direction (Y direction in the figure). A plurality of flow path forming partition walls 31, 32, 33 having a partition wall surface along the above are provided in a distributed arrangement in the first direction.
The plurality of flow path forming partition walls 31, 32, 33 are paired with the central region partition wall group 31 provided in the central region in the first directional view (direction view shown in FIG. 3) viewed along the first direction. One side area partition wall group 32 provided in the vicinity of one side outer wall 12b of the first outer wall 12a, 12b, and provided in the vicinity of the other side outer wall 12a of the pair of first outer walls 12a, 12b. It is composed of the other side region partition group 33.
In the first directional view (direction view shown in FIG. 3), at least one flow path forming partition wall (at least one of 31a to 31e) constituting the central region partition wall group 31 constitutes at least one side region partition wall group 32. At least one flow path forming partition wall (at least one of 31a to 31e) constituting the central region partition wall group 31 is arranged so as to be superposed on a part of one flow path forming partition wall (at least one of 32a to 32d). , It is superposed on a part of at least one flow path forming partition wall (at least one of 33a to 33d) constituting the other side region partition wall group 33.
Further, at least one flow path forming partition wall (at least one of 32a to 32d) constituting the one-side region partition wall group 32 is connected to the one-side outer wall 12b and at least constitutes the other-side region partition wall group 33. One flow path forming partition wall (at least one of 33a to 33d) is connected to the other side outer wall 12a.

Incidentally, in the embodiment, as shown in FIG. 2, in each of the flow path forming partition walls (31a to 31e) constituting the central region partition wall group 31 in the first direction, the one-side region partition wall group 32 The flow path forming partition walls (32a to 32d) of the above and the flow path forming partition walls (33a to 33d) of the other side region partition wall group 33 are provided one by one.
Further, in the embodiment, the flow path forming partition walls (31a to 31e) constituting the central region partition wall group 31 have the same length in the second direction, and both end positions in the second direction are aligned. The flow path forming partition walls (32a to 32d) constituting the one-side region partition wall group 32 have the same length in the second direction and are arranged so that both ends are aligned in the second direction. The flow path forming partition walls (33a to 33d) constituting 33 have the same length in the second direction and are arranged so that both end positions in the second direction are aligned.
Then, all the flow path forming partition walls (31a to 31e) constituting the central region partition wall group 31 are partially contacted with a part of the flow path forming partition walls (32a to 32d) of the one side region partition wall group 32 which are in close contact with each other in the first direction. All the flow path forming partition walls (31a to 31e) that are superposed in the first direction and constitute the central region partition wall group 31 are the flow path forming partition walls (33a to 33a) of the other side region partition wall group 33 that are in close contact with each other in the first direction. It is superimposed on a part of 33d) in the first direction view.
Further, all of the flow path forming partition walls (32a to 32d) constituting the one-side region partition wall group 32 are connected to the one side outer wall 12b, and the flow path forming partition walls (33a) constituting the other side region partition wall group 33 are connected. All of ~ 33d) are connected to the other side outer wall 12a.
Further, in the embodiment, the flow path forming partition walls (32a to 32d) constituting the one-side region partition wall group 32 and the flow path forming partition walls (33a to 33d) forming the other side region partition wall group 33 are respectively. , Are arranged at the same position in the second direction. In this configuration, the flow path forming partition walls (32a to 32d) constituting the one-side region partition wall group 32 arranged at the same position in the second direction and the flow path forming partition wall (32a to 32d) forming the other side region partition wall group 33 ( A gap is formed between each of 33a to 33d).

With the above configuration, in the plan view of FIG. 2, the heating chamber 13 has a plurality of axisymmetric shapes with respect to the symmetric line Z that passes through the central position in the second direction that is orthogonal to the first direction and along the first direction. The flow path forming partition walls 31, 32, 33 are provided in a line-symmetrical shape with respect to the symmetric line Z.

With the above configuration, the combustion gas E ejected from the burner 14 to the heating chamber 13 can be roughly divided into one side region (one side region partition group 32) in which the heating chamber 13 is partitioned by the symmetry line Z in a plan view. A flow flowing through the region) and a flow flowing through the other side region (the region including the other side region partition group 33) in which the heating chamber 13 is partitioned by the symmetry line Z are formed, and both flows are formed. The flow rates of the constituent combustion gas E are substantially the same. Further, since the combustion gas E diffuses in the second direction and flows in the first direction, the temperature gradient in the second direction can be reduced at each position in the first direction, and the temperature is uniform. Can be achieved. Further, it is possible to prevent the combustion gas E from being short-circuited and guided from the burner 14 to the exhaust port 15, and to improve the thermal efficiency.
Further, according to the configuration, the overall flow direction of the combustion gas E is a single direction from the burner 14 to the exhaust port 15, and the overall flow direction is from the exhaust port 15 to the burner 14. Is not generated, so that the combustion gas E can be passed through the heating chamber 13 while maintaining a relatively high flow velocity. As a result, the thermal efficiency is further improved.
Regarding the flow of the combustion gas E, in other words, the combustion gas E discharged from the burner 14 is formed in the gap between the flow path forming partition walls 31a to 31e constituting the central region partition wall group 31 and the one side outer wall 12b. One-sided region partition group that flows through the gap between the flow path forming partition walls 31a to 31e constituting the central region partition group 31 and the other side outer wall 12a and is arranged at the same position in the second direction. The gap between the flow path forming partition walls (32a to 32d) constituting the 32 and the flow path forming partition walls (33a to 33d) forming the other side region partition group 33 will pass through.

Further, in the embodiment, as shown in FIG. 2, in the first direction, the plurality of flow path forming partition walls 31, 32, 33 are arranged so that the closer to the burner 14, the wider the distance between them is adjacent to each other. .. In the example shown in FIG. 2, in the flow direction of the combustion gas E, the adjacent intervals L1 of the flow path forming partition walls 31, 32, 33 on the upstream side are adjacent to the flow path forming partition walls 31, 32, 33 on the downstream side. It is arranged wider than the interval L2. As a result, the flow velocity in the flow direction of the combustion gas E is less likely to slow down on the downstream side, and the thermal efficiency on the downstream side is improved.

Further, as shown in FIG. 2, in the first direction, the flow path forming partition wall 31a closest to the burner 14 and the flow path forming partition wall 31e closest to the exhaust port 15 form a flow path forming the central region partition group 31. As a partition wall, the combustion gas E is diffused in the second direction in the vicinity of the burner 14, and the combustion gas E is diffused in the second direction also in the vicinity of the exhaust port 15.

[Experiments and simulations]
Next, the experiments and simulations performed to verify the effects of the present invention will be described with reference to FIGS. 4 to 8.
The experiment and simulation are evaluated by comparing the results of the first embodiment and the second embodiment according to the present invention with the first comparative example and the second comparative example.

As shown in FIG. 4A, the first embodiment has the same configuration as the flyer 100 according to the above-described embodiment described so far. Incidentally, the length of the heating chamber 13 in the first direction is 785 mm, the length in the second direction is 1635 mm, and L1 which is the distance between the flow path forming partition walls is 120 mm and L2. Is 80 mm. The flow rate of the combustion air A to the burner 14 is 70 m ³ / h, and the flow rate of the fuel gas F is 5 m ³ / h.
In the second embodiment, as shown in FIG. 4B, the number of flow path forming partition walls forming the central region partition wall group 31 is four, and the flow forming the one-side region partition wall group 32 is the same as in the first embodiment. The number of path-forming partition walls and the number of flow path-forming partition walls forming the other side region partition wall group 33 are three, respectively.
In Comparative Example 1, as shown in FIG. 4C, the flow path forming partition wall is not provided.
As shown in FIG. 4D, Comparative Example 2 corresponds to Patent Document 1 described in the prior art.

In the experiment, together with arranging a thermocouple at the position shown in T1~T6 in FIG 4, by disposing a thermocouple in the position shown in T _E in the exhaust duct 22 of FIG. 3, the combustion gas E into the heating chamber 13 The temperature was measured while the air was flowing.
[Table 1] and [Table 2] show the average value of the measured temperatures for one hour. In addition, in [Table 1] and [Table 2], in the experiment, the temperature of the combustion gas E guided to the heat exchanger 21 became 400 ° C. or higher, and the experiment was interrupted from the viewpoint of protecting the heat exchanger 21, so that the data is obtained. Numerical values are not shown where the data has not been obtained.

In particular, as is clear from the values of the temperature differences ΔT _1-2 , ΔT _3-4 , and ΔT _5-6 in [Table 1], in Example 1 and Example 2, compared with Comparative Examples 1 and 2, No. It can be seen that the temperature difference in the two directions (X direction in FIG. 4) can be sufficiently suppressed, and the temperature in the second direction can be made more uniform. Further, it can be seen that the exhaust temperature _TE is also lower in Example 1 and Example 2 than in Comparative Example 2.

Next, the results of the simulation will be described with reference to FIGS. 5 to 8. Each of FIGS. 5 to 8 shows the results corresponding to Example 1, Example 2, Comparative Example 1, and Comparative Example 2. Incidentally, FIGS. 5 to 8 show the results corresponding to one side region of the two regions in which the heating chamber 13 is partitioned by the symmetry line Z. (A) shows the temperature of the combustion gas E flowing through the heating chamber 13, and (b) shows the speed of the combustion gas E flowing through the heating chamber 13.
From the simulation results, it can be said that in Example 1 and Example 2, the temperature difference of the combustion gas E in the second direction can be reduced as compared with Comparative Example 2.
It should be noted that in Example 1 and Example 2, the area of the region where the flow velocity of the combustion gas E is 13.5 m / s or more and 15.0 m / s or less is wider than that of Comparative Example 2. It can be said that the thermal efficiency in this part is high.

Regarding FIGS. 5 to 8, the corresponding color drawings are shown in the property submission form separately submitted, and the effect of the present invention can be grasped more clearly by referring to the color drawings together.

[Another Embodiment]
(1) In the above embodiment, the first direction (Y direction in the figure) and the second direction (X direction in the figure) do not necessarily have to be orthogonal to each other. Therefore, the heating chamber 13 is shown in the embodiment. As mentioned above, it does not have to be a rectangular parallelepiped shape.

(2) In the above embodiment, the partition wall surfaces of the flow path forming partition walls 31, 32, 33 are oriented along the second direction (X direction in the drawing), but the direction may not necessarily be along the second direction.

(3) In the above embodiment, in the first direction, each of the flow path forming partition walls (31a to 31e) constituting the central region partition wall group 31 has a flow path forming partition wall (one side region partition wall group 32). 32a to 32d) and one flow path forming partition wall (33a to 33d) of the other side region partition wall group 33 are provided respectively.
However, not limited to this configuration, in the first direction, the flow path forming partition walls (32a to 32a) of the one-side region partition wall group 32 are located between the flow path forming partition walls (31a to 31e) constituting the central region partition wall group 31, respectively. 32d) and a plurality of flow path forming partition walls (33a to 33d) of the other side region partition wall group 33 may be adopted.

(4) In the above embodiment, the flow path forming partition walls (31a to 31e) constituting the central region partition wall group 31 have the same length in the second direction and are arranged so that both ends are aligned in the second direction. Although the configuration example is shown, the flow path forming partition walls (31a to 31e) may have different lengths from each other, or both end positions may not be aligned.

(5) The flow path forming partition walls (32a to 32d) forming the one-side region partition wall group 32 may have different lengths in the second direction, or the flow path forming forming the other side region partition wall group 33 may be formed. The partition walls (33a to 33d) may have different lengths in the second direction. Further, the end positions in the second directions of both may not be aligned.

The configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in the present specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified without departing from the object of the present invention.

The liquid heating device of the present invention can maintain high thermal efficiency while preventing heat damage to the heat exchanger, and can reduce the temperature gradient in the first direction of the heating chamber to expand the usable area. It can be effectively used as a heating device.

10: Bottom wall 11: Oil tank 11a: Oil tank bottom plate 12a, 12b: First outer wall 12a: Opposite side outer wall 12b: One side outer wall 13: Heating chamber 14: Burner 15: Exhaust port 21: Heat exchanger 31: Center Area partition group 32: One side area partition group 33: Other side area partition group 31, 32, 33: Flow path forming partition wall 100: Flyer X: Second direction Y: First direction Z: Symmetric line

Claims (6)

A liquid heating device provided with a heating chamber provided along the bottom of a liquid tank for storing liquid.
A combustion gas introduction portion for introducing combustion gas into the heating chamber is arranged at one end in the first direction along the longitudinal direction of the bottom of the liquid tank, and the combustion gas in the heating chamber is located at the other end in the first direction. Is arranged to exhaust the gas to the outside,
A pair of first outer walls provided along the first direction are provided as side walls of the heating chamber.
In the heating chamber, only a plurality of flow path forming partition walls, which are connected to the bottom of the heating chamber and the bottom of the liquid tank and have partition wall surfaces along the second direction intersecting the first direction, are the first. It is provided by being distributed in one direction.
The plurality of flow path forming partition walls are a group of central region partition walls provided in the central region and one side outer wall of one of the pair of the first outer walls in a first directional view viewed along the first direction. It is composed of a one-sided region partition wall group provided in the vicinity and a other-side region partition wall group provided in the vicinity of the other side outer wall of the pair of the first outer walls.
In the first direction view, at least one of the flow path forming partition walls constituting the central region partition wall group is superposed on a part of at least one of the flow path forming partition walls forming the one side region partition wall group. At the same time, at least one of the flow path forming partition walls constituting the central region partition wall group is superposed on a part of at least one of the flow path forming partition walls forming the other side region partition wall group.
At least one of the flow path forming partition walls constituting the one side region partition wall group is connected to the one side outer wall, and at least one of the flow path forming partition walls forming the other side region partition wall group is said. Connected to the outer wall on the other side,
The plurality of flow path forming partition walls form a combustion gas flow path that allows the combustion gas introduced from the combustion gas introduction portion to flow and leads to the exhaust port .
A liquid heating device in which a plurality of the flow path forming partition walls are arranged closer to each other in the first direction so as to be closer to each other.
Liquid heating device. The liquid heating according to claim 1, wherein in the first direction, the flow path forming partition wall that is in close contact with the combustion gas introduction portion and the flow path forming partition wall that is in close contact with the exhaust port form the central region partition wall group. apparatus. The heating chamber has a line-symmetrical shape with respect to a line of symmetry that passes through a substantially central position in a second direction orthogonal to the first direction as well as along the first direction in a plan view.
The liquid heating device according to claim 1 or 2, wherein the plurality of flow path forming partition walls are provided in a line-symmetrical shape with respect to the symmetrical line in the plan view. In the first direction, the flow path forming partition wall of the one side region partition wall group and the flow path of the other side region partition wall group are located between the flow path forming partition walls constituting the central region partition wall group, respectively. One forming partition wall is provided for each,
All the flow path forming partition walls constituting the central region partition wall group are arranged so as to be superimposed on a part of the flow path forming partition wall of the one side region partition wall group which is in close contact in the first direction in the first direction view. , All the flow path forming partition walls constituting the central region partition wall group are arranged so as to overlap with a part of the flow path forming partition wall of the other side region partition wall group which is in close contact in the first direction in the first direction view. Being done
All of the flow path forming partition walls constituting the one side region partition wall group are connected to the one side outer wall, and all of the flow path forming partition walls forming the other side region partition wall group are connected to the other side. The liquid heating device according to any one of claims 1 to 3, which is connected to an outer side wall. A burner that generates combustion gas to the combustion gas introduction section is provided.
Any one of claims 1 to 4 provided with a heat exchanger for heat exchange between the combustion air guided to the burner and the combustion exhaust gas discharged from the exhaust port by the combustion gas passing through the heating chamber. The liquid heating device according to the section. The liquid heating device according to any one of claims 1 to 5, wherein the partition wall surfaces of the plurality of flow path forming partition walls are provided along the second direction orthogonal to the first direction.

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