JP3655688B2 - Combustion equipment - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a combustion apparatus used for a plurality of applications.
[0002]
[Prior art]
Conventionally, combustion apparatuses used for a plurality of purposes such as hot water supply and bath chase, hot water supply and heating, are roughly classified into a two-can two-water type and a single-can two-water type.
The two-can two-water combustion apparatus includes two independent heat exchange units and a combustion unit corresponding to these heat exchange units. Each heat exchange unit includes a large number of vertical fin plates and water pipes passing therethrough. A combustion apparatus that performs hot water supply and bath remedy will be described. When hot water is supplied, combustion is performed in one of the combustion sections, and hot water is supplied through the water pipes of the heat exchange sections corresponding thereto. When bathing is performed, combustion is performed in the other combustion section, and the water in the bathtub is passed through the water pipe of the corresponding heat exchange section.
The above-described two-can two-water combustion apparatus can perform two functions such as hot water supply and bath remedy without interfering with each other, and has high performance. However, since two independent combustion units are required, the apparatus becomes large and expensive.
[0003]
A general canned and two-water type combustion apparatus, for example, a combustion apparatus for hot water supply or bath remedy, includes one common heat exchange section and one combustion section. The heat exchanging part is configured by penetrating through a large number of fin plates two water pipes for hot water supply and for bathing. These two water pipes are arranged separately at the top and bottom. In this apparatus, when performing either hot water supply or bath remedy, combustion is performed in the same combustion section, and the same heat exchange section is heated. When hot water supply is executed, water from the water supply pipe passes through the hot water supply water pipe of the heat exchange section. When bath remedy is executed, water from the bathtub passes through the bath remedy water pipe in the heat exchange section.
[0004]
The one-can / two-water combustion apparatus performs hot water supply and bath remedy with common components, so that the configuration is small and simple and inexpensive. However, there is a drawback that the hot water supply and bath remedy interfere with each other. For example, when only hot water is supplied, the water accumulated in the bath chase water pipe is also heated. Similarly, when only bathing is performed, water accumulated in the hot water supply pipe is also heated. Therefore, the heat exchange efficiency at the time of single combustion was bad. In addition, when the water accumulated in the hot water flow pipe continues to be heated during bath bathing and becomes hot, hot water higher than the desired temperature may be produced at the initial stage of hot water supply.
[0005]
Japanese Examined Patent Publication No. 2-17784 discloses an improved canned and two-water type combustion apparatus. In this combustion device, heat exchange parts for hot water supply and bath remedy are arranged separately on the left and right in one frame, and the combustion parts corresponding to these heat exchange parts are arranged directly below them. Yes. The upper part of the frame is a holding cylinder that holds the heat exchange part, and the lower part is a combustion cylinder that surrounds the flame from the combustion part. In this configuration, although the mutual interference between the hot water supply and the bath remedy is small, the two heat exchanging parts are accommodated in one frame, so that it is smaller and less expensive than the two-can two-water type.
[0006]
[Problems to be solved by the invention]
In the apparatus disclosed in the above publication, if the internal space of the combustion cylinder is not partitioned, the request for further reducing the mutual interference between the hot water supply and the bath remedy cannot be met. This is because if there is no partition, not only the corresponding heat exchange section but also a part of the other heat exchange section will be heated by the fluctuation of the flame of the combustion section. Therefore, a partition wall for partitioning the internal space of the combustion cylinder is required, and the manufacturing cost is high.
[0007]
[Means for Solving the Problems]
A combustion apparatus according to the invention of claim 1 includes a plurality of combustion sections arranged horizontally in one direction, a plurality of heat exchange sections respectively disposed directly above the plurality of combustion sections corresponding to the plurality of combustion sections, A common holding cylinder that surrounds and holds the plurality of heat exchange units, a common combustion cylinder that extends downward from the holding cylinder and surrounds the flames from the plurality of combustion units, and the plurality of combustion units selectively. Means for supplying gas, and a common fan for supplying combustion air to the combustion section and exhausting the combustion gas passing through the heat exchange section, and an air passage is formed at the boundary of the plurality of combustion sections. An air curtain that partitions the internal space of the combustion cylinder is formed by passing an air flow by a fan through the air passage.
[0009]
A second aspect of the present invention, in the combustion apparatus according to claim 1, in the heat exchange unit, a number of vertical fins plate, extends in the arrangement direction of the heat exchange portion, in a direction perpendicular to the array direction of the heat exchange section It is arranged and the water flow pipe has penetrated the fin plate in the direction orthogonal to the arrangement direction of a heat exchange part, It is characterized by the above-mentioned.
[0010]
According to a third aspect of the present invention, in the combustion apparatus of the second aspect , the fin plates of the plurality of heat exchanging portions are connected to each other to form a common plate, and the common plate has openings at the boundaries of the plural heat exchanging portions. The formed portions located above and below these openings serve as bridging portions that connect the fin plates for each heat exchange portion.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a one-can two-water combustion apparatus having two functions of hot water supply and bath remedy. This combustion apparatus is configured by connecting an exhaust unit 10, a heat exchange unit 20, a burner unit 30, and a fan 40 in order from the top.
[0012]
The burner unit 30 includes a box-shaped frame 31 having an open upper end, and a burner assembly 32 accommodated in the frame 31. The fan 40 is attached to the bottom wall of the frame 31.
[0013]
As shown in FIG. 6, the burner assembly 32 has a first burner element 33 (first burner element) and a second burner element 34 (second burner element) arranged in the X-axis direction (left-right direction in FIGS. 1 and 6). ) Are alternately arranged without gaps. These burner elements 33 and 34 have a vertical flat plate shape extending in the direction of the Y axis (horizontal axis orthogonal to the X axis), and have inlets 33a and 34a on one side of the lower end as shown in FIG. The upper end surface has a number of flame openings 33b and 34b. In FIG. 7, the flame ports 33 b and 34 b are shown in a small number in order to simplify the drawing.
[0014]
The burner elements 33 and 34 receive gas from a nozzle portion of a nozzle block 58 (to be described later) and air from the fan 40 at the introduction ports 33a and 34a, and mix both in the internal cavities 33c and 34c. Gas is blown out from the flame outlets 33b, 34b. In the first burner element 33, since the inlet 33a is relatively narrow and the amount of air introduced is small, the gas concentration of the mixed gas becomes higher than the ideal concentration (the gas concentration not excessive or insufficient for combustion). On the contrary, since the introduction port 34a of the second burner element 34 is relatively wide and the air introduction amount is large, the gas concentration of the mixed gas becomes lower than the ideal concentration.
[0015]
The burner assembly 32 is divided into two regions, each of which serves as a hot water supply combustion section 32a and a bath-heating combustion section 32b. These combustion parts 32a and 32b are arranged side by side in the left-right direction (X-axis direction) as shown in FIGS.
[0016]
As shown in FIG. 1, the means 50 for supplying gas to the burner assembly 32 includes a main pipe 51 and two branch pipes 52 and 53 branched from the main pipe 51. The main pipe 51 is provided with a main electromagnetic on-off valve 54 and an electromagnetic proportional valve 55, and the branch pipes 52 and 53 are provided with auxiliary electromagnetic on-off valves 56 and 57, respectively. A nozzle block 58 is connected to the two branch pipes 52 and 53. The nozzle block 58 which has two passages which are respectively connected to the branch pipes 52 and 53, has a nozzle portion of the two groups which are respectively connected to the two passages. One group of nozzle portions faces the inlets 33a and 34a of the burner elements 33 and 34 of the hot water supply combustion portion 32a, and the other group of nozzle portions is the burner elements 33 and 34 of the bath recuperation combustion portion 32b. It faces the inlets 33a and 34a.
[0017]
In the internal space of the frame 31, the upper and lower sides of the burner 32 are connected by a bypass passage 60, and an air volume sensor 61 is provided in the bypass passage 60. The air volume sensor 61 obtains information on the amount of air flowing from the fan 40 through the burner unit 30 by detecting the amount of air passing through the bypass passage 60 or the pressure difference between the upper and lower sides of the burner unit 30.
[0018]
As shown in FIGS. 1 and 3, the heat exchange unit 20 includes a frame 21 having a rectangular cross section and having upper and lower ends opened, and two heat exchange portions 22 a and 22 b housed in the frame 21. . The upper part of the frame 21 serves as a holding cylinder 21x for holding the heat exchange parts 22a and 22b, and the lower part is provided as a combustion cylinder 21y. The combustion cylinder 21 y is connected to the frame 31 of the burner unit 30.
[0019]
The heat exchanging unit 22a is provided for hot water supply, and the heat exchanging unit 22b is provided for bath chase. These heat exchange units 22a and 22b are arranged in the X-axis direction, the hot water supply heat exchange unit 22a is arranged directly above the hot water supply combustion unit 32a, and the bath recuperation heat exchange unit 22b is the bath recuperation combustion unit. It is arranged directly above 32b. A water supply pipe 71 and a hot water supply pipe 72 are connected to the hot water supply heat exchanging section 22a. The hot water supply pipe 72 is provided with a stopper 73. A circulation fitting 83 of the bathtub 80 is connected to the bath exchanging heat exchanging part 22b via an outward pipe 81 and a backward pipe 82. The return pipe 82 is provided with a pump 85.
[0020]
Next, the structure of the heat exchange unit 20 will be described in detail. As shown in FIG. 3, the heat exchange unit 20 has a large number of thin common plates 25 housed in a holding cylinder 21 x of a frame 21. The common plate 25 is vertical and extends long in the X-axis direction over both the heat exchanging portions 22a and 22b, and is arranged at equal intervals in the Y-axis direction (direction perpendicular to the paper surface in FIG. 1).
[0021]
As shown in FIG. 2, each common plate 25 includes a portion located in the hot water heat exchange section 22a, that is, the first fin plate 25a, and a portion located in the bath heating heat exchange section 22b, that is, the second fin plate 25b. have. An opening 25c is formed at the boundary between the first fin plate 25a and the second fin plate 25b, and the two portions 25d ₁ and 25d ₂ positioned above and below the opening 25c are connected to the first fin plate 25a and the second fin plate 25a. It is provided as a bridging portion 25d connected to the fin plate 25b. The vertical width of the bridging portion 25d (the sum of the widths D ₁ and D ₂ of the portions 25d ₁ and 25d ₂ ) is smaller than the minimum vertical width D ₀ of the fin plates 25a and 25b. In other words, the cross-sectional area for heat transfer in the X-axis direction (longitudinal direction of the common plate 25) in the bridging portion 25d is smaller than the heat transfer cross-sectional area of each fin plate 25a, 25b.
[0022]
A plurality of through holes 25x and 25y are formed in the first fin plate 25a and the second fin plate 25b of the common plate 25, respectively. As shown in FIG. 3, a first water pipe 26 and a second water pipe 27 that are different from each other pass through these through holes 25 x and 25 y, respectively. The first water pipe 26 has a plurality of straight portions 26a that extend in the Y-axis direction through the fin plate 25 and the holding cylinder 21x, and a vent portion 26b that connects these straight portions 26a. Similarly, the second water pipe 27 also has a straight portion 27a and a vent portion 27b.
[0023]
One end (inlet end) of the first water pipe 26 is connected to the water supply pipe 71 via the cooling pipe 28 (see FIGS. 3 to 5), and the other end (outlet end) is connected to the hot water supply pipe 72. . One end (inlet end) of the second water pipe 27 is connected to the return pipe 82 via the cooling pipe 29 (see FIGS. 3 to 5), and the other end (outlet end) is connected to the forward pipe 81. As shown well in FIGS. 4 and 5, the cooling pipes 28 and 29 are wound about one turn in the same direction in contact with the outer periphery of the combustion cylinder 21y, and cool the combustion cylinder 21y. Take a role.
[0024]
The heat exchange unit 20 is manufactured as follows. In a state where the straight pipes constituting the straight portions 26 a and 27 a of the water flow pipes 26 and 27 are penetrated through the holding cylinder 21 x of the frame 21 and a large number of common plates 25, these straight pipes are subjected to diameter expansion processing into the common plate 25. Adhere closely. Next, the straight pipe is brazed to the holding cylinder 21x and the common plate 25 by melting a brazing rod (not shown) that is passed through the common plate 25 adjacent to the straight pipe. Simultaneously with or before or after this brazing, the semicircular arc pipes constituting the vent portions 26b and 27b are brazed to the straight pipe.
[0025]
When the heat exchange unit 20 is manufactured, the common plate 25 extends over the hot water supply heat exchanging part 22a and the bath exchanging heat exchanging part 22b and is common to both the heat exchanging parts 22a and 22b. In addition to simplification, the heat exchanging parts 22a and 22b can be simultaneously manufactured on the same line. As a result, the manufacturing cost of the heat exchange unit 20 can be reduced.
Since the bridging portion 25d is composed of the two portions 25d ₁ and 25d ₂ , the strength is particularly high against twisting, and damage can be prevented in the manufacturing process of the heat exchange unit 20 and the like.
[0026]
Next, the general operation of the combustion apparatus will be described. When the stopper 73 is opened, water flows through the water supply pipe 71, the water flow pipe 26, and the hot water supply pipe 72. A water flow switch (not shown) provided in the water supply pipe 71 detects this, and in response to this detection signal, a control unit (not shown) opens the main electromagnetic on-off valve 54 and the auxiliary electromagnetic on-off valve 56, Combustion control in the hot water supply combustion section 32a is started. As a result, the first fin plate 25a located in the common plate 25 directly above the hot water supply combustion section 32a is mainly heated, and as a result, the water from the water supply pipe 71 passing through the first water pipe 26 is heated, Thus, the hot water supply pipe 72 is supplied. At this time, since the combustion is not performed in the bath pursuit combusting section 32b, only the air not combusted from the fan 40 passes through the bath pursuit heat exchanging section 22b. The water inside is not heated. Further, the heat escaping from the heated first fin plate 25a to the second fin plate 25b through the bridging portion 25d can be suppressed little because the total width of the bridging portion 25d is narrow.
[0027]
When bathing is performed, the pump 85 is driven based on the control of the control unit to circulate the water in the bathtub 80 through the return pipe 82, the water pipe 27, and the forward pipe 81. At the same time, the main electromagnetic on-off valve 54 and the auxiliary electromagnetic on-off valve 57 are opened to start combustion in the bath-measuring combustion section 32b. As a result, of the common plate 25, the second fin plate 25b positioned directly above the bath recuperation combustion portion 32b is mainly heated, and as a result, the water from the bathtub 80 passing through the second water pipe 27 is heated.焚 is executed. At this time, since combustion is not executed in the hot water supply combustion section 32a, only the air without combustion from the fan 40 passes through the hot water supply heat exchange section 22a, and heats the water in the first water pipe 26. Never do. Further, there is little heat escaping from the second fin plate 25b to the first fin plate 25a via the bridging portion 25d.
[0028]
As described above, the hot water supply and bath bathing are basically performed without mutual interference, and when the water passing through one of the water pipes 26 and 27 is heated, the water accumulated in the other is not heated. The heat load in the heat exchange unit 20 can be small, and the heat exchange efficiency during single combustion can be increased. In particular, when only bathing is performed, the water accumulated in the first water pipe 26 is not heated, so that inconvenience that a temperature higher than the desired temperature is discharged at the initial stage of the hot water supply operation can be prevented.
[0029]
In this embodiment, the burner assembly 32 is constructed by alternately arranging the first and second burner elements 33 and 34. The second burner element 34 blows out a lean mixed gas from the flame port 34b and burns at a time in the vicinity of the flame port 34b. Therefore, as shown in FIG. 8, the rising speed of the combustion gas is fast, and the flame is straight and does not fluctuate. Since the first burner element 33 blows out the rich mixed gas from the flame outlet 33b, the first burner element 33 continues to burn as it rises while receiving air from the adjacent second burner element. Combustion at an ideal gas concentration can be performed by the combustion in the first and second burner elements 33 and 34 as a whole.
[0030]
As described above, since the flames from the burner elements 33 and 34 extend straight upward, the mutual interference between the hot water supply and the bath remedy can be further reduced. This is because the flame caused by the combustion in the hot water supply combustion section 32a extends straight and heats only the hot water supply heat exchange section 22a, and this flame does not sway to heat a part of the heat exchanger section 22b for bath chase. Similarly, the flame caused by the combustion in the combusting section 32b for bath chase extends straight and heats only the heat exchanging part 22b for bath chase, and the flame fluctuates to heat a part of the heat exchanging part 22a for hot water supply. Because there is nothing to do. As a result, it is not necessary to provide a partition wall for further reducing mutual interference as in the prior art, and the manufacturing cost can be reduced.
[0031]
The fan 40 is controlled by the control unit so that the mixing ratio of gas and air in the combustion sections 32a and 32b becomes a desired value based on feedback information of the air flow rate from the air volume sensor 61. Since not only when both hot water supply and bath remedy are executed simultaneously, but also when only one of them is executed, the internal space of the combustion cylinder 22y is not partitioned by the partition wall, so one air volume sensor 61 is provided. The above control can be performed based on only the detection information.
[0032]
While performing at least one of hot water supply and bath remedy, the combustion cylinder 21y is exposed to a high temperature to surround the flame from the burner 32, but of the two cooling pipes 28 and 29 wound around the entire circumference. Cooling can be ensured with water flowing through at least one of them.
[0033]
As in the above embodiment, instead of alternately using the first and second burner elements 33 and 34 that perform light and dark combustion independently, a large number of common burner elements 81 as shown in FIG. 9 may be used. . The common burner element is, for example, a first burner element 82 that performs rich combustion on both sides, and a second burner element 83 that performs light combustion on the center.
[0034]
10 and 11 show a second embodiment of the present invention. In this embodiment, components corresponding to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 11, the burner assembly 32 has an elongated gap 35 (air passage) extending in the Y-axis direction at the boundary between the two combustion portions 32a and 32b. An air flow caused by the fan 40 passes through the gap 35, and the air flow rises toward the boundary between the heat exchanging portions 22a and 22b as shown by arrows in FIG. Thus, an air curtain that partitions the internal space of the combustion cylinder 21y into two is formed. With this air curtain, the flame of the hot water supply combustion section 32a is directed to the bath recuperation heat exchange section 22b, and the flame of the bath recuperation combustion section 32b is further directed to the hot water supply heat exchange section 22a. It can be forbidden and mutual interference can be eliminated.
[0035]
In the above-described second embodiment, the burner assembly 32 employs a concentration gas combustion method using the first and second burner elements 33 and 34 to stabilize the flame and use an air curtain caused by the gap 35. By doing so, the mutual interference is minimized, but when the gap 35 is formed, the burner assembly 32 does not have to adopt the light and dark combustion method.
Further, instead of forming the gap 35, a burner assembly as shown in FIG. 6 is used so that gas is not supplied to the inlet 34a of the second burner element 34 located at the boundary between the combustion sections 32a and 32b ( It is good also as an air curtain by eliminating the nozzle part which opposes this part), and blowing only air from the flame opening 34b. In this case, the second burner element 34 constitutes an air passage.
[0036]
【The invention's effect】
As described above, according to the first aspect of the present invention, a plurality of combustion sections are arranged horizontally, and a plurality of heat exchanging sections are horizontally arranged correspondingly, while being small in size with one can and two water types. Since they are arranged, mutual interference can be basically reduced. Moreover, since the air curtain that partitions the internal space of the combustion cylinder is created by the air flow from the air passage formed at the boundary of the combustion section, mutual interference can be further eliminated.
[0038]
According to the invention of claim 2 , by devising the arrangement of the fin plates, there is no interference between the vent portions of the plurality of heat exchange portions, and the combustion device can be made compact by bringing the heat exchange portions closer. Thus, even if it makes several heat exchange parts approach, mutual interference can be minimized by the device of Claim 1 .
[0039]
According to invention of Claim 3 , in addition to the effect of Claim 2 , there exists the following effect. That is, since the fin plates of the plurality of heat exchanging portions are connected to form a common plate, the fin plates can be easily handled and the plural regions can be manufactured at the same time when the heat exchanging portion is manufactured. As a result, the manufacturing cost of the heat exchange part can be reduced. In addition, since the openings are formed between the fin plates, the amount of heat transfer between the fin plates via the bridging portion is reduced, and mutual interference between the regions can be avoided more reliably. Moreover, since a bridge | crosslinking part consists of a several part which left | separated up and down, mechanical strength can be made high.
[Brief description of the drawings]
FIG. 1 is a system diagram showing a schematic configuration of a combustion apparatus showing an embodiment of the present invention.
FIG. 2 is a front view showing a fin plate of the combustion apparatus.
FIG. 3 is a plan sectional view of a heat exchange part of the combustion apparatus.
4 is a front view seen from the IV direction in FIG. 3. FIG.
FIG. 5 is a rear view seen from the V direction in FIG. 3;
FIG. 6 is a plan view of a burner assembly used in the combustion apparatus.
7A is a schematic perspective view of a first burner element, and FIG. 7B is a schematic perspective view of a second burner element.
FIG. 8 is a front view showing a state of flame in the burner assembly.
FIG. 9 is a perspective view showing a burner element according to another embodiment.
FIG. 10 is a view corresponding to FIG. 1 and showing a second embodiment of the present invention.
FIG. 11 is a plan view of a burner assembly used in the second embodiment.
[Explanation of symbols]
21 frame 21x holding cylinder 21y combustion cylinder 22a hot water supply heat exchanger 22b bath additionally焚用heat exchange section 25 common plate 25a, 25b fin plate 25c opening 25d _1, 25d ₂ bridge portion 26 first water communicating tube 27 second water communicating tube 32a Hot water supply combustion section 32b Bath recuperation combustion section 33 First burner element (first burner element)
34 Second burner element (second burner element)
35 Clearance (air passage)
40 Fan 50 Gas supply means 82 First burner element 83 Second burner element

Claims (3)

A plurality of combustion sections arranged horizontally in one direction, a plurality of heat exchange sections respectively disposed directly above the plurality of combustion sections, and surrounding and holding the plurality of heat exchange sections A common holding cylinder, a common combustion cylinder extending downward from the holding cylinder and surrounding a flame from the plurality of combustion sections, means for selectively supplying gas to the plurality of combustion sections, and the combustion section A common fan that supplies combustion air and exhausts the combustion gas through the heat exchange section,
An air passage is formed at a boundary between the plurality of combustion sections, and an air curtain for partitioning an internal space of the combustion cylinder is formed by passing an air flow by a fan through the air passage. In each heat exchange unit, a large number of vertical fin plates extend in the direction in which the heat exchange units are arranged, and are arranged in a direction orthogonal to the direction in which the heat exchange units are arranged, and the water pipes are orthogonal to the direction in which the heat exchange units are arranged. The combustion apparatus according to claim 1 , wherein the combustion apparatus penetrates the fin plate in a direction. Fin plates of a plurality of heat exchange parts are connected to each other to form a common plate, and openings are formed in the common plate at the boundary of the plurality of heat exchange parts. The combustion apparatus according to claim 2 , wherein the combustion apparatus is a bridging portion that connects the fin plates.

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