JP2009014206A - Heat exchanger, and water heating system and heat transfer tube comprising the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of easily and surely performing the work in inserting a desired member such as a partitioning member between loop portions of a spiral tubular body portion. <P>SOLUTION: The spiral tubular body portion 3 of the heat transfer tube T is accommodated in a case to which a heating medium is introduced, a plurality of loop portions 30 of the spiral tubular body portion 3 are respectively composed of an inclined tubular body portion S1 inclined with respect to the shaft length direction at one end portion in the width direction intersecting the shaft length direction of the spiral tubular body portion 3, and a non-inclined tubular body portions S2 orthogonal to the shaft length direction at its intermediate portion and the other end portion in the width direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes a heat exchanger used for a purpose of heating a desired fluid such as water by performing heat recovery from a heating medium such as combustion gas using a heat transfer tube having a helical tube portion. The present invention relates to a hot water apparatus and a heat transfer tube used as a component of a heat exchanger.

  Specific examples of conventional heat exchangers include those described in Patent Documents 1 to 3. The heat exchangers described in these publications have a configuration in which a helical tube portion of a heat transfer tube is accommodated in a case where combustion gas is introduced. Heat is recovered from the combustion gas by the helical tube portion, and water supplied into the heat transfer tube is heated. The spiral tubular body portion has a large heat transfer area as compared with the tubular body in Suki, for example, which is simply formed as a whole. Therefore, according to the heat exchanger, the heat recovery amount can be increased while reducing the number of heat transfer tubes.

  However, the prior art sometimes has the following problems.

  That is, when the heat exchanger is actually designed and manufactured, for the purpose of improving the heat exchange efficiency and other various matters, for example, a flat plate is formed in a gap between a plurality of loop portions connected to a series of helical tube portions. In some cases, a desired member such as a partition member may be inserted. However, the helical tube portion of the prior art has a configuration in which any portion of the plurality of loop portions is inclined (a configuration having a so-called winding gradient), and the gap between the loop portions is also helical, Any part of the gap is inclined. For this reason, when a desired member such as a partition member has a slightly large width, it becomes difficult to accurately insert the member into the gap between the loop portions, which causes a problem that the insertion work is difficult. It was.

Japanese Patent No. 2835286 Japanese Patent Laid-Open No. 62-288446 No. 6-8442

  The present invention has been conceived under the circumstances as described above, and when a desired member such as a partition member is inserted between the loop portions of the spiral tubular body portion, the operation is easy and It is an object of the present invention to provide a heat exchanger that can be accurately performed, a hot water device including the heat exchanger, and a heat transfer tube for the heat exchanger.

  In order to solve the above problems, the present invention takes the following technical means.

  The heat exchanger provided by the first aspect of the present invention includes a case in which a heating medium is introduced, and a plurality of loop portions housed in the case and connected in series in the axial direction. A heat exchanger having a helical tube portion and a heat transfer tube for recovering heat from the heating medium, all of the plurality of loop portions of the helical tube portion Alternatively, one part of the width direction intersecting the axial length direction is an inclined tube body part that is inclined with respect to the axial length direction, and the intermediate part and the other end part of the width direction are It is a non-inclined tube part orthogonal to the axial length direction.

  According to such a configuration, a gap extending straight in a direction orthogonal to the axial length direction is formed between the non-inclined tube portions of the adjacent loop portions. Therefore, a large-sized member such as a flat plate can be easily inserted into such a gap, and various conveniences can be achieved. For example, as will be described later, it is possible to easily realize that the partition member is inserted into the gap between the loop portions of the spiral tube portion and the spiral tube portion is partitioned into a plurality of heat exchange regions. In addition, if only one end in the width direction of the loop portion of the spiral tube portion is an inclined tube portion, the loop region is entirely compared with the prior art in which the entire width direction of the loop portion is an inclined tube portion. It is also possible to obtain an effect of reducing the height dimension in the axial length direction of the part and reducing the height dimension of the entire spiral tube part.

  In a preferred embodiment of the present invention, the partition member further includes a partition member inserted in a gap between the non-inclined tube portions adjacent to each other among the plurality of loop portions of the spiral tube portion. Divides the interior of the case into first and second space portions, and partitions the helical tube portion into first and second heat exchange portions located in the first and second space portions, respectively. And a communication portion for communicating the first and second space portions with each other, and the heating medium introduced into the case is circulated through the first and second space portions in order. It is configured.

  According to such a configuration, in the process of sequentially circulating the heating medium to the first and second heat exchange units in the case, the heating medium is exchanged with the first and second heat exchanges of the spiral tubular body unit. Heat exchange can be performed by acting on each of the parts, and heat recovery can be performed by effectively utilizing substantially the entire spiral tubular body part. Since the partition member is inserted into the gap between the non-inclined tube portions adjacent to each other among the plurality of loop portions, the insertion work is easy.

  In a preferred embodiment of the present invention, the end of the case in the width direction is provided with a heating medium inlet and outlet, and these inlet and outlet are the first and second outlets. The communication portion is formed at an end portion on the opposite side to the introduction port in the width direction in the case, and is used for heating supplied to the introduction port. The medium travels through the first space portion in the width direction, then passes through the communication portion, flows into the second space portion, and then travels through the second space portion in the width direction. It is configured to reach the discharge port.

  According to such a configuration, the heating medium can be smoothly advanced over substantially the entire area of the first and second space portions formed in the case, with respect to various portions of the helical tube portion. It becomes possible to make combustion gas act efficiently.

  In a preferred embodiment of the present invention, each loop portion of the spiral tube body portion includes a pair of straight tube portions extending in the width direction and a pair of end portions of the pair of straight tube portions. A bent tube portion, and one of the pair of bent tube portions is the inclined tube body portion, and the other of the pair of bent tube portions and the pair of the bent tube portions. The straight tube portion is the non-tilted tube portion.

  According to such a configuration, by increasing the length of the straight tube portion of each loop portion, the overall heat transfer area of the spiral tube portion is reduced while reducing the overall height of the spiral tube portion. Can be greatly increased. Therefore, it is more suitable to increase the amount of heat recovery while reducing the size.

  The hot water apparatus provided by the second aspect of the present invention introduces the heat exchanger provided by the first aspect of the present invention and the combustion gas as the heating medium into the case of the heat exchanger. And a combustor to be provided.

  According to such a configuration, the same effect as described for the heat exchanger provided by the first aspect of the present invention can be obtained.

  The heat transfer tube provided by the third aspect of the present invention is a heat transfer tube having a spiral tube body portion in which a plurality of loop portions connected in series are arranged in the axial length direction. All or a part of the loop part is an inclined tube part in which one end part in the width direction intersecting the axial length direction is inclined with respect to the axial length direction, and the intermediate part in the width direction and others The end portion is a non-tilted tube portion orthogonal to the axial length direction.

  According to such a configuration, it can be suitably used as a heat transfer tube of the heat exchanger provided by the first aspect of the present invention, and the same effect as described above can be obtained.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 to 10 show an example of a hot water apparatus to which the present invention is applied, and a configuration related thereto. As clearly shown in FIG. 1, the hot water device WH includes a combustor 1 and a heat exchanger HE.

  The combustor 1 is arranged in a can body 10 mounted on the case 2 of the heat exchanger HE, and fuel gas or fuel oil supplied from the outside of the can body 10 through a fuel supply pipe 11 is used. The predetermined fuel can be burned. This combustor 1 is a so-called reverse combustion type, and combustion air is supplied downward from the fan 12 into the can body 10, and the combustion gas generated by the combustor 1 travels downward to introduce the inlet 20. To proceed into the case 2. As shown in FIG. 6, the introduction port 20 is formed near one end in the width direction of the upper surface portion of the case 2.

  In FIG. 1, the heat exchanger HE includes a plurality of heat transfer tubes T, a plurality of spacers 4, a partition plate 5, and an auxiliary member 6 in addition to the case 2. Although details of the operation of the heat exchanger HE will be described later, in the heat exchanger HE, the inside of the case 2 is partitioned vertically by the partition plate 5 to form the first and second space portions 21a and 21b. The combustion gas that has passed downward through the introduction port 20 enters the one end portion of the first space portion 21a, and then proceeds toward the other end portion as indicated by an arrow N1. A part of the first and second space portions 21a and 21b communicates with each other via the communication portion 22, and the combustion gas that has advanced to the other end portion of the first space portion 21a is indicated by an arrow N2. Then, it passes through the communication part 22 and proceeds to one end of the second space part 21b. Next, the combustion gas proceeds toward the other end of the second space 21b as indicated by an arrow N3, reaches the discharge port 23, and is discharged outside the case 2 as indicated by an arrow N4. The

  For easy understanding, a plurality of heat transfer tubes T will be described first with reference to FIG. In the figure, a heat transfer tube T is integrated with, for example, a spiral tube portion 3 manufactured by winding a tube that is a raw material, and a lower portion and an upper portion of the spiral tube portion 3. It has extended pipe parts 38a and 38b connected to separate bodies. In the spiral tubular body portion 3, a plurality of substantially elliptical loop portions 30 are connected in series, and are arranged in the axial length direction (direction in which the central axis C extends) of the spiral tubular body portion 3 through a gap 39. It has a configuration. Each loop portion 30 has a pair of straight tube portions 30a extending in the width direction (left-right direction in FIG. 7), and a pair of substantially semicircular arc-shaped bent tube portions 30b and 30b ′ connected to these end portions. is doing. Each loop portion 30 is provided with an inclined tube portion S1 and a non-inclined tube portion S2. The inclined tube portion S1 has a so-called winding gradient and is a portion inclined with respect to the axial length direction of the spiral tube portion 3. In the present embodiment, the curved pipe part 30b 'is the inclined pipe part S1. On the other hand, the inclined tube portion S2 is a portion that has no winding gradient and maintains a posture orthogonal to the axial length direction. A pair of straight pipe part 30a and curved pipe part 30b are non-inclined pipe parts S2.

  As shown in FIG. 3, the loop portions 30 of the plurality of helical tube portions 3 are different in size, and the plurality of helical tube portions 3 are arranged in a substantially concentric lap winding. Arranged in the case 2. The extending pipe portions 38a and 38b pass through the side wall of the case 2 and are drawn out of the case 2, to which headers 37a and 37b for water entry and hot water are attached. Although not shown in the drawings, a water supply pipe and a hot water discharge pipe are connected to these headers 37a and 37b, and the water supplied from the water supply pipe to the header 37a for receiving water is a plurality of spiral tubular body portions 3. In this case, it is heated by the combustion gas at that time, and then reaches the header 37b for hot water and is supplied to a desired hot water supply destination through the hot water pipe.

  The auxiliary member 6 is for preventing combustion gas from flowing into the inner space 31 of the innermost spiral tube portion 3. As shown in FIG. 2, the auxiliary member 6 is formed in a hollow shape for the purpose of weight reduction, for example, and is inserted into the space portion 31 to close the space portion 31. Yes.

  The partition plate 5 is configured using, for example, a flat metal plate. However, as shown in FIG. 4, the partition plate 5 has a notch 50 for avoiding interference with the auxiliary member 6 and the spacer 4. As described above, the partition plate 5 partitions the inside of the case 2 into the first and second space portions 21a and 21b, but the first and second heat pipes 3 have the first and second heat parts. It is partitioned into replacement parts H1, H2 (see FIGS. 1, 2, 5, etc.). More specifically, the partition plate 5 is inserted into the gap 39 in the intermediate height portion of each helical tube portion 3, whereby each helical tube portion 3 is inserted into the first space portion 21 a. Are divided into a first heat exchange part H1 located in the second space part 21b and a second heat exchange part H2 located in the second space part 21b. The partition plate 5 is provided so as to form the communication portion 22 of the first and second space portions 21a and 21b, and as shown in FIG. 3, a boundary portion 3 ′ (a part of the curved pipe portion 30 b ′) between the first and second heat exchange portions H 1 and H 2 passes therethrough.

  The operation of inserting the partition plate 5 into the gap 39 of the loop portion 30 is performed as shown in FIG. That is, each loop part 30 of the helical tube part 3 has the non-inclined tube part S2 as described above, but the gap 39 formed between these non-inclined tube parts S2. Also, it is non-inclined and extends straight in a substantially horizontal direction. Therefore, the partition plate 5 can be easily inserted into such a gap 39 from one side thereof.

  The plurality of spacers 4 are members for defining the size of each gap 39 of the spiral tubular body portion 3. As shown in FIGS. 9 and 10, the spacers 4 are formed by bending a metal wire 42 having a diameter of about several millimeters, for example, and are arranged in a line at intervals in the vertical direction. It has a plurality of substantially U-shaped or substantially V-shaped projections 40 and a plurality of connecting portions 41 that connect the base end portions of the plurality of projections 40. As shown in FIG. 3, the plurality of spacers 4 are attached to the straight tube portion 30 a of the plurality of spiral tube portions 3. However, the way of attaching them is not uniform, and some spacers 4 (4A) are attached to the tube portion 30a from the outer side, and other spacers 4 (4B) are It is attached to the tubular body portion 30 from the inner side. 5, the protrusions 40 of the spacers 4A and 4B are arranged alternately one by one in the vertical direction, and the protrusions 40 of the spacer 4A are, for example, odd-numbered from the top. The protrusions 40 of the spacer 4B are inserted only into the even-numbered gaps 39 from the top, whereas they are inserted only into the gaps 39 of the eyes. Further, the protrusions 40 of the spacer 4A are inserted only into the outer three rows of gaps 39, for example, whereas the protrusions 40 of the spacer 4B are inserted only into the inner three rows of gaps 39. According to such a configuration, it is possible to increase the vent opening area of the cross-section where the spacers 4A and 4B are respectively mounted, and to reduce the exhaust resistance at those locations.

  Next, the operation of the hot water device WH will be described.

  First, when the combustor 1 is driven and combustion gas flows into the case 2 from the inlet 20, the combustion gas is located above the partition plate 5 as indicated by arrows N <b> 1 to N <b> 4 in FIG. 1. After proceeding from one end portion of the first space portion 21a toward the other end portion, it passes through the communication portion 22 downward and flows into the second space portion 21b on the lower side of the partition plate 5 as well. Next, the combustion gas travels from one end portion to the other end portion of the second space portion 21b, and is then discharged to the outside from the discharge port 23. The combustion gas acts on the first heat exchanging portion H1 of the spiral tubular body portion 3 when passing through the first space portion 21a, and the second heat when passing through the second space portion 21b. It acts on the exchange part H2. For this reason, combustion gas can be made to act effectively in the substantially whole region of the plurality of spiral tubular body portions 3, and high heat exchange efficiency can be obtained. When heat is recovered from the combustion gas, the sensible heat of the combustion gas can be recovered by the first heat exchange unit H1, and the latent heat can be recovered by the second heat exchange unit H2. When latent heat is recovered from the combustion gas, condensed water is generated. However, according to the present embodiment, condensed water can be generated in the second heat exchanging section H2, and the treatment of condensed water is facilitated. Is done. Although not shown in the drawing, as a condensate treatment means, for example, a condensate discharge port is provided at the bottom of the case 2, and the condensate that has flowed down from the second heat exchange part H2 onto the bottom of the case 2 A means for discharging water from the discharge port to the outside of the case 2 can be adopted.

  Since the inner space portion 31 of the spiral tubular body portion 3 is closed by the auxiliary member 6, the combustion gas does not enter the space portion 31. Therefore, the flow path when the combustion gas travels through the first and second space portions 21 a and 21 b is narrowly limited to the peripheral portion of the spiral tubular body portion 3, and the combustion gas is supplied to the spiral tubular body portion 3. It can act more effectively. Further, the spiral tubular body portion 3 has a straight tubular body portion 30a extending in the width direction of the case 2, and the combustion gas travels along the tubular body portion 30a. Because of this, it is possible to further increase the heat exchange efficiency.

  In this heat exchanger HE, as described with reference to FIG. 8, since the spiral tubular body portion 3 has the gap 39 extending substantially horizontally, the partition plate 5 can be easily attached to this portion. Can be inserted. Therefore, when assembling the heat exchanger HE, it is possible to appropriately avoid problems such as difficulty in mounting the partition plate 5. Further, the gap 39 extending horizontally is formed in a long dimension range excluding the curved pipe portion 30 b ′ in the width direction of each loop portion 30. Therefore, it is possible to insert the long dimensional range of the partition plate 5 deeply into the gap 39 and accurately classify the spiral tubular body portion 3 as the first and second heat exchange portions H1 and H2.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the heat exchanger, the hot water device, and the heat transfer tube according to the present invention can be varied in design in various ways.

  As described above, the heat transfer tube according to the present invention has an advantage that a partition member and other desired members can be easily inserted into the gap between the loop portions of the spiral tube body portion. At this time, such a desired member does not necessarily have to be inserted, and even when used in such a manner, it is included in the technical scope of the present invention.

  Each loop portion of the helical tube portion of the heat transfer tube can be formed in a substantially long rectangular shape instead of a substantially oval shape. In this case, each loop portion is formed in a substantially oval shape. The same effect as the case can be obtained. Of course, each loop part can also be formed in shapes other than them. Further, in the present invention, it is preferable that all the loop portions of the spiral tube portion have a configuration in which only one end portion in the width direction is an inclined tube portion, but only a part of the loop portions are so. It may be configured as such. The shape of the case can also be formed in various shapes corresponding to the shape of the loop portion of the helical tube body.

  The spiral tubular body portion may have a posture set in a laid-down shape so as to be, for example, a horizontal direction instead of a posture in which the axial length direction is a vertical height direction (vertical direction) of the case. The heat exchanger according to the present invention may not be configured to be able to recover both sensible heat and latent heat from the combustion gas. In addition, the hot water device referred to in the present invention is a concept indicating not only a hot water supply device but also a general device having a function of generating hot water (including hot water of antifreeze liquid).

It is front sectional drawing which shows an example of the hot water apparatus provided with the heat exchanger to which this invention was applied. It is sectional drawing of the cross-sectional location different from FIG. 1 of the hot water apparatus shown in FIG. It is a plane sectional view of the hot water device shown in FIG. It is IV-IV sectional drawing of FIG. It is VV sectional drawing of FIG. It is a schematic plan view of the heat exchanger shown in FIG. (A) is a top view of the heat exchanger tube used for the heat exchanger shown in FIG. 1, (b) is VII-VII sectional drawing of (a). It is explanatory drawing which shows the state which inserts a partition plate in the helical tube part of the heat exchanger tube used for the heat exchanger shown in FIG. It is a perspective view which shows the spacer used for the heat exchanger shown in FIG. (A) is a top view of the spacer shown in FIG. 9, (b) is the front view, (c) is the right view.

Explanation of symbols

WH Hot water device HE Heat exchanger T Heat transfer tube S1 Inclined tube portion S2 Non-inclined tube portion H1, H2 First and second heat exchange portions 1 Combustor 2 Case 3 Spiral tube portion 5 Partition plate (partition member )
20 Combustion gas inlet (heating medium inlet)
21a, 21b 1st and 2nd space part 22 Communication part 23 Exhaust port of combustion gas (exhaust port of heating medium)
30 Loop part (for spiral tube)
30a Straight tube (loop part)
30b Curved pipe (loop part)
39 Clearance (between loops)

Claims (6)

A case where a heating medium is introduced inside,
A heat transfer tube for recovering heat from the heating medium, having a spiral tubular body portion that is accommodated in the case and connected in series with a plurality of loop portions arranged in the axial length direction;
A heat exchanger comprising:
All or a part of the plurality of loop portions of the helical tube portion is an inclined tube portion in which one end portion in the width direction intersecting the axial length direction is inclined with respect to the axial length direction, And the intermediate part and other end part of the said width direction are made into the non-inclined pipe part orthogonal to the said axial length direction, The heat exchanger characterized by the above-mentioned. Of the plurality of loop portions of the spiral tube portion, further comprising a partition member inserted in the gap between the non-inclined tube portions adjacent to each other,
The partition member partitions the inside of the case into first and second space portions, and first and second heat exchanges in which the spiral tubular body portion is located in the first and second space portions, respectively. Forming a communication part that divides the part and communicates the first and second space parts with each other;
The heat exchanger according to claim 1, wherein the heating medium introduced into the case is configured to sequentially flow through the first and second space portions. The end of the case in the width direction is provided with a heating medium inlet and outlet, and the inlet and outlet are in communication with the first and second spaces, respectively.
The communication part is formed at the end of the case opposite to the introduction port in the width direction,
The heating medium supplied to the introduction port travels in the first space portion in the width direction, then passes through the communication portion, flows into the second space portion, and then the second space portion. The heat exchanger according to claim 2, wherein the heat exchanger is configured to reach the discharge port after traveling in the width direction.   Each loop portion of the spiral tubular body portion has a substantially oval shape having a pair of straight tube portions extending in the width direction and a pair of curved tube portions connected to ends of the pair of straight tube portions. Or it is formed in a substantially long rectangular shape, one of the pair of bent tube portions is the inclined tube body portion, and the other of the pair of bent tube portions and the pair of straight tube portions are not inclined. The heat exchanger according to any one of claims 1 to 3, wherein the heat exchanger is a tube part.   The heat exchanger according to any one of claims 1 to 4, and a combustor for introducing combustion gas as the heating medium into the case of the heat exchanger. Hot water device. A heat transfer tube having a spiral tube portion in which a plurality of loop portions connected in series are arranged in the axial length direction,
All or a part of the plurality of loop portions is an inclined tube body portion whose one end portion in the width direction intersecting the axial length direction is inclined with respect to the axial length direction, and is intermediate in the width direction The heat transfer tube is characterized in that the portion and the other end portion are non-inclined tube portions orthogonal to the axial length direction.

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