CN113494775A - Heat exchanger and hot water device comprising same - Google Patents

Heat exchanger and hot water device comprising same Download PDF

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Publication number
CN113494775A
CN113494775A CN202110305482.1A CN202110305482A CN113494775A CN 113494775 A CN113494775 A CN 113494775A CN 202110305482 A CN202110305482 A CN 202110305482A CN 113494775 A CN113494775 A CN 113494775A
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CN
China
Prior art keywords
heat exchanger
heat transfer
portions
pipe
transfer pipe
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Pending
Application number
CN202110305482.1A
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Chinese (zh)
Inventor
藤泽秀行
瀬直己
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Noritz Corp
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Noritz Corp
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Publication of CN113494775A publication Critical patent/CN113494775A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/006—Tubular elements; Assemblies of tubular elements with variable shape, e.g. with modified tube ends, with different geometrical features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F24H1/41—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes in serpentine form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/142—Connecting hydraulic components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/146—Connecting elements of a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
    • F28D7/085—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions
    • F28D7/087—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions assembled in arrays, each array being arranged in the same plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • F28F9/0224—Header boxes formed by sealing end plates into covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0024—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for combustion apparatus, e.g. for boilers

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Details Of Fluid Heaters (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

A Heat Exchanger (HE) is provided with a plurality of heat transfer tubes (2) in a serpentine shape, the plurality of heat transfer tubes (2) including a first heat transfer tube (2A) and a second heat transfer tube (2B), and the first heat transfer tube (2A) and the second heat transfer tube (2B) being displaced in the z direction in such a manner that: the plurality of straight tube portions (20) are adjacent to each other in a predetermined y direction and are in a non-overlapping state when viewed in the y direction, a first recess (3A) that is recessed in the y direction is provided in each bent tube portion (21) of the first heat exchanger tube (2A), and a part of each bent tube portion (21) of the second heat exchanger tube (2B) is fitted into the first recess (3A). According to this configuration, it is possible to eliminate abnormalities such as an increase in flow path resistance of the serpentine heat exchanger tube (2) of the Heat Exchanger (HE) and the occurrence of a large amount of residual stress in the heat exchanger tube (2), and to appropriately reduce the overall size.

Description

Heat exchanger and hot water device comprising same
Technical Field
The present invention relates to a heat exchanger used as a component of a hot water apparatus such as a hot water supply apparatus and configured to recover heat from a heating medium such as combustion gas by a heat transfer pipe, and a hot water apparatus including the heat exchanger.
Background
As an example of the heat exchanger, there is a heat exchanger described in patent document 1.
In the heat exchanger described in patent document 1, a serpentine heat transfer pipe is used as a heat transfer pipe for recovering heat from the combustion gas. The serpentine heat transfer pipe has a structure in which a plurality of straight pipe portions are connected to each other via a plurality of bent pipe portions. In the above document, a plurality of heat transfer pipes are used as such a serpentine heat transfer pipe, and the plurality of heat transfer pipes are stacked, for example, in the vertical direction. The heat transfer pipes adjacent to each other are arranged in a staggered manner, for example, in the horizontal direction, so that the combustion gas easily acts on the heat transfer pipes.
In the heat transfer pipes, the bent pipe portions are formed in a flat shape and have a smaller thickness than the straight pipe portions. This allows the adjacent heat transfer pipes to approach each other. Therefore, the width of the entire heat transfer pipe in the stacking direction can be reduced, and the size of the entire heat exchanger can be reduced.
However, according to the conventional techniques, there is still room for improvement as described below.
First, since the entire bent pipe portions of the serpentine heat exchanger pipe are formed in a flat shape, there is a disadvantage that resistance (flow path resistance) when the fluid to be heated flows through the interior of the heat exchanger pipe becomes large.
Secondly, since the amount of processing for flattening the entire bent pipe portions is large, the residual stress increases. This results in stress cracking of the heat pipes. When the heat exchanger is used, for example, a water hammer phenomenon causes a large pressure to act on the heat transfer pipe, and therefore it is desirable that the residual stress be as small as possible.
Third, as a method of flattening each bent pipe portion of the serpentine heat exchanger tubes, for example, as shown in fig. 13, a method of performing press working on the bent pipe portion 21 of the heat exchanger tube 2e in a direction intersecting the bending direction of the bent pipe portion 21 is considered. However, if such press working is performed, a force is generated to deform the bent pipe portion 21 in a direction in which both ends open, as indicated by arrow Na. In patent document 1, since the amount of press working is large, the deformation is likely to occur, and the heat transfer tube 2e may become different from the original specification.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent No. 4143431 publication
Disclosure of Invention
[ problems to be solved by the invention ]
The purpose of the present invention is to provide a heat exchanger that can eliminate abnormalities such as an increase in flow path resistance of a serpentine heat transfer pipe or the occurrence of a large amount of residual stress in the heat transfer pipe, and that can appropriately reduce the overall size, and a water heating apparatus including the heat exchanger.
[ means for solving problems ]
In order to solve the above problems, the present invention adopts the following technical means.
A heat exchanger according to a first aspect of the present invention includes a plurality of heat transfer tubes, wherein among the plurality of heat transfer tubes, a plurality of straight tube portions extending in an x direction and arranged at intervals in a z direction at intervals in the x direction among the x direction, the y direction, and the z direction intersecting each other have a serpentine shape connected in series via a plurality of bent tube portions, are located in a region where a heating medium flows, and are stacked in the y direction, and the plurality of heat transfer tubes include a first heat transfer tube and a second heat transfer tube, and the first heat transfer tube and the second heat transfer tube are displaced from each other in the z direction as follows: the first heat transfer pipe has a plurality of bent pipe portions, and the plurality of bent pipe portions are partially provided with first concave portions that are recessed in the y direction, and the plurality of straight pipe portions are adjacent to each other in the y direction, and the plurality of bent pipe portions are partially overlapped with each other when viewed in the y direction.
Preferably, each of the bent pipe portions of the first heat transfer pipe includes a pair of side surface portions facing in the y direction, and the first recess is provided in each of the pair of side surface portions.
Preferably, each of the bent pipe portions of the first heat transfer pipe includes a pair of side surface portions facing in the y direction, and the first recess is provided in only one of the pair of side surface portions.
Preferably, a second concave portion that is concave in the y direction is provided in a part of each bent pipe portion of the second heat transfer pipe, and the formation positions of the first concave portion and the second concave portion are fitted to each other.
Preferably, the second heat transfer pipe has a configuration corresponding to a configuration in which a heat transfer pipe having the same shape and size as the first heat transfer pipe is vertically inverted.
Preferably, the first heat transfer pipe and the second heat transfer pipe are formed using metal round pipes.
It is preferable that the heat exchanger of the present invention further comprises: a case that accommodates the first heat transfer pipe and the second heat transfer pipe therein, and the heating medium is supplied to the inside of the case; and a pair of header portions for supplying and discharging hot water to and from the first heat transfer pipe and the second heat transfer pipe, respectively.
Preferably, the x-direction and the y-direction are both horizontal directions, and the z-direction is a vertical direction.
A second aspect of the present invention provides a hot water apparatus characterized by including the heat exchanger provided in the first aspect of the present invention.
Further features and advantages of the invention will become apparent from the following description of embodiments of the invention which is made with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic perspective view showing an example of a heat exchanger according to the present invention.
Fig. 2 shows a schematic configuration of a water heating apparatus using the heat exchanger of fig. 1, and the heat exchanger shown by a solid line in the same drawing corresponds to a sectional view II-II of fig. 1.
Fig. 3 is a sectional view III-III of fig. 1.
Fig. 4 is a perspective view showing heat transfer tubes (first heat transfer tube and second heat transfer tube) used in the heat exchanger shown in fig. 1 to 3.
Fig. 5A is a front view of a main portion of the heat transfer pipe shown in fig. 4, fig. 5B is a cross-sectional view from VB to VB of fig. 5A, fig. 5C is a side view of arrow VC of fig. 5A, fig. 5D is a cross-sectional view from VD to VD of fig. 5A, and fig. 5E is a cross-sectional view from VE to VE of fig. 5A.
Fig. 6A is a front view of a main part of the heat transfer pipes shown in fig. 5A in a state of being stacked, fig. 6B is a sectional view taken along line VIB-VIB in fig. 6A, and fig. 6C is a sectional view taken along line VIC-VIC in fig. 6A.
Fig. 7 is a perspective view showing another example of the present invention.
Fig. 8A is a front view of a main portion of the heat transfer pipe shown in fig. 7, fig. 8B is a cross-sectional view taken along VIIIB-VIIIB in fig. 8A, and fig. 8C is a cross-sectional view taken along VIIIC-VIIIC in fig. 8A.
Fig. 9 is a perspective view showing another example of the present invention.
Fig. 10A is a front view of a main portion of the heat conductive pipe shown in fig. 9, fig. 10B is a cross-sectional view of XB-XB of fig. 10A, and fig. 10C is a cross-sectional view of XC-XC of fig. 10A.
Fig. 11 is a perspective view showing another example of the present invention.
Fig. 12A is a front view of a main portion of the heat transfer pipe shown in fig. 11, fig. 12B is a cross-sectional view XIIB-XIIB of fig. 12A, and fig. 12C is a cross-sectional view XIIC-XIIC of fig. 12A.
Fig. 13 is an explanatory diagram illustrating an operation of the conventional technique.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The heat exchanger HE shown in fig. 1 to 3 includes a casing 1, a plurality of serpentine heat transfer tubes 2, and a pair of header pipes 7a and 7b for inflow and outflow of hot water.
The casing 1 is formed in a substantially rectangular tubular shape or frame shape having an upper surface portion and a lower surface portion opened, and a heating medium is supplied into the casing 1.
Fig. 2 shows a water heating apparatus WH using a heat exchanger HE. In the water heater WH, a burner 80 and another heat exchanger 81 are provided on the upper side of the housing 1. The other heat exchanger 81 is a primary heat exchanger for sensible heat recovery, and the heat exchanger HE of the present embodiment is a secondary heat exchanger for latent heat recovery. In the water heater WH, the combustion gas (heating medium) generated by the burner 80 travels downward and sequentially passes through the heat exchanger 81 and the heat exchanger HE, thereby sequentially recovering sensible heat and latent heat from the combustion gas and heating the hot water by the recovered heat. The hot water is supplied to, for example, a hot water tap in a kitchen, or a hot water tap in a bathroom, a bathtub, or the like.
The plurality of heat transfer pipes 2 are serpentine heat transfer pipes formed using, for example, round metal pipes such as stainless steel, and are accommodated in the casing 1. More specifically, as fully shown in fig. 3, each heat transfer pipe 2 has a serpentine shape as follows: a plurality of straight tube portions 20 extending in the front-rear direction (an example of the x direction in the present invention) of the casing 1 and arranged at intervals in the vertical height direction (an example of the z direction in the present invention) are connected in series via a plurality of bent tube portions 21 whose sides are regarded as semi-circular arcs.
Both ends of each heat transfer tube 2 penetrate the side wall portion 10 of the casing 1, and are connected to a header portion 7a and a header portion 7b provided on the outer surface side of the side wall portion 10. Thereby, the hot water supplied from the outside to the header portion 7a passes through the inside of each heat transfer tube 2, reaches the header portion 7b, and flows out. In this process, the hot water is heated by the combustion gases.
The plurality of heat transfer pipes 2 are divided into a first heat transfer pipe 2A and a second heat transfer pipe 2B, and first recesses 3A and second recesses 3B are provided in these heat transfer pipes. This point will be explained in more detail below.
The plurality of heat transfer pipes 2 are arranged along the lateral width direction of the casing 1 (the left-right direction in fig. 2, an example of the y direction in the present invention), and the heat transfer pipes 2 adjacent to each other are provided with a vertical displacement of an appropriate dimension La from each other. In the present embodiment, the lower side is the first heat exchanger tube 2A (2), and the higher side is the second heat exchanger tube 2B (2). The first heat exchanger tube 2A and the second heat exchanger tube 2B are displaced so that the plurality of straight tube portions 20 do not overlap each other in the vertical height direction. However, a part of the plurality of bent portions 21 overlap each other (the position indicated by the symbol OV in fig. 3 is an overlapping portion OV).
As shown in fig. 4, first concave portions 3A are provided at positions corresponding to the overlapping portions OV in each bent pipe portion 21 of first heat exchanger tube 2A, and are recessed in the y direction. As fully shown in fig. 5A to 5E, the first recess 3A is disposed offset from the center line CL of each bent pipe portion 21 and is provided in each of a pair of left and right side surface portions (a pair of side surface portions facing in the y direction) of each bent pipe portion 21. That is, a pair of left and right first recesses 3A are provided in each elbow portion 21, and the pair of left and right first recesses 3A face each other. Thus, the width Lb of the formation position of the pair of first concave portions 3A of each bent pipe portion 21 is smaller than the width Lc of the other portions (corresponding to the outer diameter of the heat transfer pipe 2). The first concave portion 3A may be formed by performing partial press working on each bent pipe portion 21.
Second concave portions 3B are provided at positions corresponding to the overlapping portions OV in each bent pipe portion 21 of second heat exchanger tube 2B, and are recessed in the y direction. Here, the second heat exchanger tubes 2B in the present embodiment correspond to a configuration in which the first heat exchanger tubes 2A are vertically inverted. Therefore, the second recessed portions 3B are provided on the side surface portions of the pair of left and right side surface portions of the respective elbow parts 21, similarly to the first recessed portions 3A, and the pair of left and right second recessed portions 3B face each other.
The plurality of first heat exchanger tubes 2A and the plurality of second heat exchanger tubes 2B are set in a state in which the formation positions of the first recesses 3A and the second recesses 3B are fitted to each other, that is, in a state in which the formation positions of the second recesses 3B are fitted into the first recesses 3A and the formation positions of the first recesses 3A are fitted into the second recesses 3B (see fig. 2 and 6A to 6C).
Next, the operation of the heat exchanger HE will be described.
First, as described above, in overlap portion OV of each bent pipe portion 21 of first heat exchanger tube 2A and second heat exchanger tube 2B, the formation positions of first concave portion 3A and second concave portion 3B are fitted to each other. Therefore, as shown in the partially enlarged view of fig. 2, the straight tube portions 20 of the first heat exchanger tube 2A and the second heat exchanger tube 2B may be arranged so as to overlap each other by an appropriate dimension Ld in the lateral width direction of the housing 1. Accordingly, the width L1 of the entire heat transfer tubes 2 can be reduced, and the size of the entire heat exchanger HE can be reduced.
First heat exchanger tube 2A and second heat exchanger tube 2B are not formed in a flat configuration as a whole in each bent tube portion 21, but are formed only with first concave portion 3A and second concave portion 3B partially in each bent tube portion 21. Therefore, resistance (flow path resistance) when hot water flows through each bent pipe portion 21 can be reduced. Further, since the first concave portion 3A and the second concave portion 3B are relatively small in size, when these concave portions are formed in the respective bent pipe portions 21 by press working, the amount of press working (amount of deformation) can be reduced. Therefore, the residual stress due to the press working can be reduced, and the durability strength of the first heat exchanger tube 2A and the second heat exchanger tube 2B can be improved. Furthermore, if the amount of press working of the bent pipe portion 21 is large, the heat transfer tubes 2 may be deformed so that both end portions of the bent pipe portion 21 are opened, and this possibility can be eliminated according to the present embodiment.
Further, in the present embodiment, either one of the first concave portion 3A and the second concave portion 3B is provided in each of a pair of left and right side surface portions of each bent portion 21. Therefore, as compared with a case where either the first recess 3A or the second recess 3B is provided only in one of the pair of side surface portions as in another embodiment described below, for example, the depth dimensions of the first recess 3A and the second recess 3B can be reduced, and the overall lateral width L1 of the plurality of heat transfer tubes 2 can be reduced. If the depth dimensions of the first recessed portion 3A and the second recessed portion 3B are increased, the residual stress may increase in the case of press working these portions, and according to the present embodiment, such a concern can be appropriately avoided.
As described above, the second heat exchanger tubes 2B have a configuration in which the first heat exchanger tubes 2A are vertically inverted. Therefore, the manufacturing cost of the heat exchanger HE can be reduced compared to the case where heat transfer pipes different in shape or size are used as the first heat transfer pipe 2A and the second heat transfer pipe 2B.
Fig. 7 to 12C show another embodiment of the present invention. In these drawings, the same or similar elements as those of the embodiment are denoted by the same reference numerals as those of the embodiment.
In the embodiment shown in fig. 7 to 8C, only one of first concave portion 3A and second concave portion 3B is provided on one side surface portion of a pair of left and right side surface portions of elbow part 21 of each of first heat exchanger tube 2A and second heat exchanger tube 2B. The other side surface portion is not provided with any of the first recess 3A and the second recess 3B. The second heat exchanger tube 2B corresponds to a structure in which the first heat exchanger tube 2A is vertically inverted, as in the above-described embodiment.
As fully shown in fig. 8C, the formation position of the second concave portion 3B is fitted into the formation position of the first concave portion 3A on one side of the bent pipe portion 21 of the first heat exchanger tube 2A. On the other hand, the bent portions 21 of the first heat exchanger tube 2A are disposed on one side opposite to the one side so as to be in contact with or close to each other with the positions where the first concave portions 3A and the second concave portions 3B are not formed.
In the present embodiment, as shown in fig. 8B, the straight tube portions 20 of the first heat exchanger tube 2A and the second heat exchanger tube 2B can be overlapped with each other by an appropriate dimension Le in the lateral width direction of the housing 1. Therefore, as in the above-described embodiment, the entire width of the plurality of heat transfer tubes 2(2A, 2B) can be reduced. The structure of each heat transfer pipe 2 can also be simplified compared to the above-described embodiment in which first concave portion 3A and second concave portion 3B are provided on each of the pair of left and right side surfaces of elbow pipe 21.
In the embodiment shown in fig. 9 to 10C, a pair of first concave portions 3A are provided on a pair of left and right side surface portions of each bent pipe portion 21 in the first heat exchanger tube 2A, whereas a portion corresponding to the second concave portion 3B is not provided on the second heat exchanger tube 2B. As the second heat transfer pipe 2B, a conventional serpentine pipe can be used. As fully shown in fig. 10C, a part of the bent portions 21 of the second heat exchanger tubes 2B is directly fitted into the pair of first concave portions 3A of the first heat exchanger tube 2A.
In the present embodiment, as shown in fig. 10B, the straight tube portions 20 of the first heat exchanger tube 2A and the second heat exchanger tube 2B can be overlapped with each other by an appropriate dimension Lf in the lateral width direction of the housing 1. Therefore, as in the above-described embodiment, the entire width of the plurality of heat transfer tubes 2(2A, 2B) can be reduced. As the second heat transfer tubes 2B, conventional heat transfer tubes not including the second concave portions 3B can be used, and therefore, the manufacturing cost can be reduced.
In the embodiment shown in fig. 11 to 12C, first concave portions 3A are provided only on one side surface portion of a pair of left and right side surface portions of each bent pipe portion 21 in first heat exchanger pipe 2A. Second heat transfer pipe 2B is not provided with portions corresponding to second concave portions 3B. As fully shown in fig. 12C, in the first heat exchanger tube 2A, a part of the bent tube portion 21 of the second heat exchanger tube 2B is fitted into the first recess 3A, whereas the outer peripheral surface of the bent tube portion 21 of the second heat exchanger tube 2B is in contact with or close to one side opposite to the first recess 3A.
In the present embodiment, as shown in fig. 12B, the straight tube portions 20 of the first heat exchanger tube 2A and the second heat exchanger tube 2B can be overlapped with each other by an appropriate dimension Lg in the lateral width direction of the housing 1. Therefore, as in the above-described embodiment, the entire width of the plurality of heat transfer tubes 2(2A, 2B) can be reduced. As the second heat exchanger tube 2B, a conventional heat exchanger tube not including the second concave portions 3B can be used, and the first heat exchanger tube 2A is provided with the first concave portions 3A only on one side, whereby the manufacturing cost can be reduced.
The present invention is not limited to the contents of the above embodiments. The specific configurations of the heat exchanger and the parts of the water heating apparatus according to the present invention can be modified in various ways within the intended scope of the present invention.
The specific shape, size, depth, and the like of the first recess and the second recess are not limited. In the case where the first recess and the second recess are provided in each of the pair of left and right side surface portions of the bent pipe portion of the heat transfer pipe, and in the case where the first recess and the second recess are provided only in one of the side surface portions, the shapes of the first recess and the second recess may be different.
In the above-described embodiment, the first heat exchanger tube is used as the heat exchanger tube on the lower side of the plurality of heat exchanger tubes that are displaced in the vertical direction, and the second heat exchanger tube is used as the heat exchanger tube on the other side.
In the above-described embodiment, the x-direction and the y-direction are horizontal directions and the z-direction corresponds to the vertical height direction, but the present invention is not limited thereto and these directions can be appropriately selected. For example, a plurality of heat transfer pipes in a substantially horizontal posture may be stacked (arranged) in the vertical height direction, that is, the y direction may be the vertical height direction. In this case, the width of the entire plurality of heat transfer pipes in the vertical height direction can be reduced, and the size of the heat exchanger can be reduced.
The heat transfer pipe is serpentine, but the specific dimensions, number, material, and the like of the straight pipe portion and the bent pipe portion are not limited. The heat transfer pipe may be formed by bending a single pipe member, or may be formed by integrally connecting a straight pipe portion and an elbow pipe portion formed of separate members.
The heating medium according to the present invention is not limited to the combustion gas generated by the burner, and may be high-temperature exhaust gas or the like. The heat exchanger of the present invention may be a heat exchanger other than the latent heat recovery heat exchanger. The concept of the water heater according to the present invention includes not only a water heater for general hot water supply or bathing hot water supply, but also a water heater for hot water heating or snow melting.

Claims (9)

1. A heat exchanger is provided with a heat exchanger body,
the heat exchanger includes a plurality of heat transfer tubes, in which straight tube portions extending in an x direction and arranged at intervals in a z direction at intervals in the x direction among the x direction, the y direction, and the z direction intersecting each other have a serpentine shape connected in series via bent tube portions, are positioned in a region where a heating medium flows, and are stacked in the y direction,
the plurality of heat transfer pipes include a first heat transfer pipe and a second heat transfer pipe, which are displaced from each other in the z direction as follows: adjacent to each other in the y-direction, and the plurality of straight pipe portions are brought into a non-overlapping state with each other as viewed in the y-direction, and a part of the plurality of bent pipe portions are brought into an overlapping state with each other,
a first recess that is recessed in the y direction is partially provided in each bent pipe portion of the first heat exchanger tube, and a part of each bent pipe portion of the second heat exchanger tube is fitted into the first recess.
2. The heat exchanger of claim 1, wherein
Each of the bent pipe portions of the first heat transfer pipe includes a pair of side surface portions facing in the y direction,
the first recess is provided in each of the pair of side surface portions.
3. The heat exchanger of claim 1, wherein
Each of the bent pipe portions of the first heat transfer pipe includes a pair of side surface portions facing in the y direction,
the first recess is provided only in one of the pair of side surface portions.
4. The heat exchanger of claim 1, wherein
A second concave portion that is locally depressed in the y direction is provided in each bent pipe portion of the second heat transfer pipe,
the first recess and the second recess are formed at positions where they are fitted to each other.
5. The heat exchanger of claim 1, wherein
The second heat transfer pipe has a structure in which a heat transfer pipe having the same shape and size as the first heat transfer pipe is vertically inverted.
6. The heat exchanger of claim 1, wherein
The first heat transfer pipe and the second heat transfer pipe are formed using a metal round pipe.
7. The heat exchanger of claim 1, further comprising:
a case that accommodates the first heat transfer pipe and the second heat transfer pipe therein, and the heating medium is supplied to the inside of the case; and
and a pair of header portions for supplying and discharging hot water to and from the first heat transfer pipe and the second heat transfer pipe, respectively.
8. The heat exchanger of claim 1, wherein
The x direction and the y direction are both horizontal directions, and the z direction is the vertical height direction.
9. A water heating device comprises
The heat exchanger of any one of claims 1 to 8.
CN202110305482.1A 2020-04-06 2021-03-23 Heat exchanger and hot water device comprising same Pending CN113494775A (en)

Applications Claiming Priority (2)

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JP2020-068371 2020-04-06
JP2020068371A JP7470280B2 (en) 2020-04-06 2020-04-06 Heat exchanger and hot water device equipped with same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7484074B2 (en) * 2020-02-26 2024-05-16 株式会社ノーリツ Heat exchanger and hot water device equipped with same

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JP2018119757A (en) * 2017-01-26 2018-08-02 株式会社ノーリツ Heat exchanger and water heater including the same
CN110088554A (en) * 2016-12-28 2019-08-02 三菱重工业株式会社 Heat exchanger and ship

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JP4143431B2 (en) * 2003-01-29 2008-09-03 リンナイ株式会社 Heat exchanger
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TW201111729A (en) * 2009-07-28 2011-04-01 Cku Inc Heat exchanger using multiple pipes
CN110088554A (en) * 2016-12-28 2019-08-02 三菱重工业株式会社 Heat exchanger and ship
JP2018119757A (en) * 2017-01-26 2018-08-02 株式会社ノーリツ Heat exchanger and water heater including the same

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