JP6173801B2 - Heat exchanger and water heater using the same - Google Patents

Description

  The present invention relates to a heat exchanger and a water heater using the heat exchanger.

  2. Description of the Related Art Conventionally, a heat exchanger having a heat transfer section configured by spirally winding and stacking a plurality of heat transfer tubes arranged on the same plane is known. In such a heat exchanger, since each heat transfer tube is formed by an elongated pipe, it is difficult to maintain the arrangement relationship of each heat transfer tube in a constant state. For example, when the heat transfer tube deviates from a predetermined position, design calculations such as exhaust resistance and thermal efficiency of combustion exhaust will be out of order.

  Therefore, the heat exchanger is provided with a spacer for keeping the interval between adjacent heat transfer tubes constant and maintaining it. For example, in Patent Document 1, in a corner portion (a portion formed by folding a heat transfer tube) that is both left and right end portions of the heat transfer portion, a flat spacer is inserted and interposed between adjacent heat transfer tubes in the vertical direction. A heat exchanger is disclosed.

Japanese Patent No. 4963126

  By the way, in the heat exchanger of the said patent document 1, the required number of spacers will increase as the frequency | count (the number of lamination | stacking) of the heat exchanger tube to the up-down direction increases. Therefore, a means for preventing each spacer from falling off between the heat transfer tubes is required. In this regard, in the heat exchanger of Patent Document 1, a pair of sandwiching members are arranged on both the upper and lower sides of the corner portion. And a heat exchanger tube and a spacer between clamping members are held by screwing a pair of clamping members with a long screw (connection member).

  However, in the configuration of the heat exchanger of Patent Document 1, the number of parts is increased in order to prevent the spacer from falling off. In addition, it is necessary to pass a long screw through a narrow space between the heat transfer tubes, or to form a screw hole (through hole) in the spacer for penetrating the long screw, resulting in a complicated manufacturing and assembly process. .

  The present invention has been made in view of such a background, and is a heat exchanger that can prevent spacers from falling off and can hold and position a heat transfer section sufficiently and reliably while having a simple configuration. And a water heater using the same.

One aspect of the present invention includes a heat transfer portion configured by spirally winding one or a plurality of heat transfer tubes arranged on the same plane, and the heat transfer portion is orthogonal to the winding axis direction. A pair of corner portions that are disposed opposite to each other in a first direction and that folds the heat transfer tube, and a pair of connection portions that connect the pair of corner portions, and each winding portion includes the winding shaft. A spacer interposed between the heat transfer tubes adjacent in the direction is disposed, and at least one of the pair of corner portions is provided with a holding member that holds the corner portion. A covering portion that covers the corner portion and the spacer disposed in the corner portion from the outside in the first direction of the heat transfer portion, and from the covering portion toward the inside of the heat transfer portion in the first direction. Projecting and perpendicular to the winding axis direction and the first direction at the corner portion Covering two directions on both sides, respectively, Ru heat exchanger near characterized by having a pair second direction sandwiching section for sandwiching said corner portion from both sides of the second direction.

  In the heat exchanger, the holding member has a covering portion and a pair of second direction clamping portions. And the coating | coated part and a pair of 2nd direction clamping part have covered the corner part of the heat-transfer part from the outer side in the 1st direction and the 2nd direction. As a result, it is possible to prevent the spacers disposed between the heat transfer tubes of the corner portion from falling off. Further, in the corner portion of the heat transfer section, it is possible to suppress the displacement and spread of the heat transfer tube (particularly the position shift and spread to the outside of the heat transfer tube in the first direction and the second direction).

  Further, as described above, the holding member covers the corner portion of the heat transfer portion from the outside by the covering portion and the pair of second direction clamping portions, and the corner portion of the heat transfer portion is covered by the pair of second direction clamping portions. It is sandwiched from both sides in two directions. Therefore, it is possible to hold and position the heat transfer portion in a state where the spacer is interposed between the heat transfer tubes sufficiently and reliably. Thereby, the space | interval of the heat exchanger tubes regulated by the spacer and the arrangement | positioning position of each heat exchanger tube can be maintained, and the performance (thermal efficiency etc.) of a heat exchanger can be maintained in a high state.

  Further, by configuring the holding member as one component, for example, it is possible to easily prevent the spacer from falling off and hold and position the heat transfer section (heat transfer tube) with a small number of components, that is, a simple configuration. it can. As a result, the number of parts can be reduced and the manufacturing / assembly process can be facilitated.

  As described above, according to the present invention, it is possible to provide a heat exchanger that can prevent the spacer from falling off and can hold and position the heat transfer section sufficiently and reliably while having a simple configuration. it can.

Further, in the heat exchanger, at both end portions in the winding axis direction of the holding member in the second direction holding portion, the heat transfer portion protrudes inward in the second direction, and the corner part of but it may also be a pair of pressing piece portions provided to suppress from both sides of the winding axis direction. In this case, it is possible to suppress the displacement and spread of the heat transfer tube at the corner portion of the heat transfer portion (particularly, the displacement and spread of the heat transfer tube to the outside in the winding axis direction). Thereby, a heat-transfer part can be hold | maintained and positioned more reliably by a holding member.

Also, with the second direction sandwiching portion of the holding member, but it may also have a through hole is provided which is formed by penetrating in the thickness direction. In this case, by allowing the combustion exhaust gas to flow through the through hole of the second direction clamping portion, it is possible to prevent the second direction clamping portion of the holding member from hindering the flow of the combustion exhaust gas. Thereby, the performance (thermal efficiency etc.) of a heat exchanger can be maintained in a high state.

The holding member protrudes from the covering portion toward the inside of the first direction of the heat transfer portion, covers each side of the corner portion in the winding axis direction, and covers the corner portion in the winding direction. may have a pair of winding axis direction sandwiching section for sandwiching the both sides in the axial direction further it has good. In this case, the corner portion of the heat transfer portion can be sandwiched not only from the second direction but also from the winding axis direction. Thereby, a heat-transfer part can be hold | maintained and positioned much more reliably by a holding member.

Next, another embodiment of the invention, Ru water heater near, characterized by comprising the heat exchanger.
The water heater includes the heat exchanger described above. Therefore, in the heat exchanger, the spacer can be prevented from falling off with a simple configuration, and the effect that the heat transfer section can be sufficiently and reliably held and positioned can be obtained.

It is explanatory drawing which shows the water heater provided with the heat exchanger in Embodiment 1. FIG. It is explanatory drawing which shows the heat exchanger in Embodiment 1. FIG. FIG. 3 is a perspective view showing a heat transfer section in the first embodiment. FIG. 3 is a plan view showing a heat transfer section in the first embodiment. It is a side view which shows the heat-transfer part in Embodiment 1. It is explanatory drawing which shows the spacer arrange | positioned between the heat exchanger tubes in Embodiment 1. FIG. 3 is a perspective view showing a holding member in Embodiment 1. FIG. It is (a) top view, (b) front view, and (c) side view showing a holding member in Embodiment 1.

(Embodiment 1)
An embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1-6, the heat exchanger 1 of this embodiment is provided with the heat-transfer part 2 comprised by winding the some heat exchanger tube 3 arranged on the same plane helically. . The heat transfer section 2 is arranged to face each other in a first direction (left-right direction) orthogonal to the winding axis direction (up-down direction), and a pair of corner sections 21 formed by folding back the heat transfer tubes 3 and a pair of corner sections 21 are arranged. And a pair of connecting portions 22 to be connected. Each corner portion 21 is provided with a spacer 4 interposed between the heat transfer tubes 3 adjacent in the winding axis direction.

  As shown in FIGS. 3 to 5, 7, and 8, the pair of corner portions 21 are provided with holding members 5 that hold the corner portions 21. The holding member 5 includes a covering portion 51 that covers the corner portion 21 and the spacer 4 disposed in the corner portion 21 from the outside in the first direction of the heat transfer portion 2, and the covering portion 51 in the first direction of the heat transfer portion 2. A pair of second projections projecting inward and covering both sides of the corner portion 21 in the second direction (front-rear direction) perpendicular to the winding axis direction and the first direction, and sandwiching the corner portion 21 from both sides in the second direction. It has a two-way clamping part (front / rear clamping part) 52. This will be described in detail below.

  In the present embodiment, for convenience of explanation, the second direction is the front-rear direction, the first direction is the left-right direction, and the winding axis direction is the up-down direction. Moreover, let the 2nd direction clamping part be a front-back clamping part. Further, the flow direction of the combustion exhaust is the front-rear direction, and the combustion exhaust flows from the rear side to the front side. Moreover, each direction of front and rear, right and left, and upper and lower is prescribed | regulated from the viewpoint (refer FIG. 1) which looked at the water heater 8 (heat exchanger 1) mentioned later from the front. However, each of these directions is only a direction defined for convenience, and it is arbitrary which side of the water heater 8 and the heat exchanger 1 is regarded as the front side.

  As shown in FIG. 1, the water heater 8 is a latent heat recovery type combustion appliance that recovers sensible heat and latent heat from combustion exhaust, and a main heat exchanger (not shown) that mainly recovers sensible heat from the combustion exhaust. A secondary heat exchanger (heat exchanger 1) that mainly recovers latent heat from the combustion exhaust gas whose temperature has decreased due to heat exchange in the main heat exchanger is incorporated.

  As shown in FIG. 2, the heat exchanger 1 includes a heat transfer unit 2 and a case 10 that houses the heat transfer unit 2. The heat exchanger 1 introduces and discharges combustion exhaust into and from the space in the case 10 that houses the heat transfer unit 2, so that the fluid to be heated such as water flowing through the heat exhaust pipe 3 of the combustion exhaust and the heat transfer unit 2 It is comprised so that heat exchange may be performed.

  In this embodiment, the flow direction of the combustion exhaust in the case 10 is the front-rear direction, and the combustion exhaust is introduced from the rear side of the case 10 and discharged from the front side. The right side wall 104 of the case 10 is provided with a hollow introduction member 11 and a discharge member 12 for introducing and discharging the fluid to be heated from the outside.

  As shown in FIGS. 3 to 5, the heat transfer section 2 includes five heat transfer tubes 3 arranged on the same plane in two stages in the vertical direction, and these heat transfer tubes 3 are spirally wound in the vertical direction. It is configured to turn. That is, it has a multiple helical structure. One end portion 301 of each heat transfer tube 3 passes through the side wall portion 104 of the case 10 and is connected to the introduction member 11, and the other end portion 302 passes through the side wall portion 104 of the case 10. The discharge member 12 is connected.

  As shown in the figure, the heat transfer section 2 has a pair of corner sections 21 and a pair of connecting sections 22. The pair of corner portions 21 are provided on both the left and right sides of the heat transfer portion 2 and are disposed facing each other in the left-right direction. Each corner portion 21 is configured by folding (folding) the heat transfer tube 3 into a U-shape. On the other hand, a pair of connection part 22 is provided in the front-back both sides of the heat-transfer part 2, and is arrange | positioned facing the front-back direction. Each connection part 22 is comprised by extending the heat exchanger tube 3 in the left-right direction so that a pair of corner part 21 may be connected.

  Each corner portion 21 of the heat transfer unit 2 is provided with a plurality of spacers 4 interposed between the heat transfer tubes 3 adjacent in the vertical direction to maintain the vertical interval between the heat transfer tubes 3. Yes. Specifically, in the left corner portion 21, six stages of heat transfer tubes 3 folded (bent) in a U-shape are stacked (see FIG. 5), and five spacers 4 are disposed. ing. Further, since the heat transfer tubes 3 folded (bent) in a U-shape are stacked in four stages on the right corner portion 21 (see FIG. 5), three spacers 4 are disposed. . Each spacer 4 is inserted and arranged between the heat transfer tubes 3 from the left and right sides of the heat transfer section 2.

  As shown in FIG. 6, the spacer 4 is a triangular plate-like member, and includes a flat surface portion 41 and a plurality of protrusion portions 42 that are formed to protrude from the flat surface portion 41. The side surface of the projecting portion 42 is inclined with respect to the projecting direction (vertical direction), and has a conical shape as a whole. And the protrusion part 42 positions the heat exchanger tube 3, and maintains the space | interval of the left-right direction of the heat exchanger tubes 3 mutually. Further, the projecting portion 42 is provided with a through hole 421 that penetrates in the thickness direction (vertical direction) and distributes the combustion exhaust gas. FIG. 6 is an enlarged view of the left corner portion 21 of the heat transfer section 2 excluding the holding member 5. Although not shown, the right corner portion 21 has the same configuration as the left corner portion 21.

  As shown in FIGS. 3 to 5, the holding members 5 are disposed at the corner portions 21 of the heat transfer section 2. The holding member 5 holds the corner portion 21 of the heat transfer portion 2 so as to cover from the outside. Hereinafter, a specific configuration and shape of the holding member 5 will be described.

  As shown in FIGS. 3 to 5, 7, and 8, the holding member 5 includes a flat cover portion 51 and a pair of flat front and rear clamping portions 52. The coating | coated part 51 has covered the corner part 21 of the heat-transfer part 2 from the outer side of the left-right direction. The pair of front and rear clamping parts 52 are formed so as to protrude from the front and rear ends of the covering part 51 toward the inner side in the left-right direction of the heat transfer part 2, and respectively cover the front and rear sides of the corner part 21 of the heat transfer part 2. In addition, the pair of front and rear clamping units 52 clamps the corner portion 21 of the heat transfer unit 2 from both the front and rear sides.

  In addition, a pair of connecting corners 511 that are connected to the front and rear clamping parts 52 are provided at both front and rear ends of the covering part 51. Each connecting corner portion 511 is provided with a plurality of through holes 512 that penetrate in the thickness direction and allow the combustion exhaust gas to flow therethrough.

  Each front and rear clamping portion 52 is provided with a plurality of through-holes 521 that penetrate in the thickness direction (the front-rear direction in the present embodiment) and distribute the combustion exhaust gas. In addition, a pair of holding pieces 522 are provided at the upper and lower ends of each front and rear clamping unit 52. The pair of holding pieces 522 are formed so as to protrude inward in the front-rear direction of the heat transfer unit 2, and hold down the corner portions 21 of the heat transfer unit 2 from both the upper and lower sides.

  In addition, as shown in FIGS. 3 to 5, 7, and 8, in the present embodiment, the holding member 5 includes a pair of flat windings in addition to the covering portion 51 and the pair of front and rear clamping portions 52. It has an axial clamping part (hereinafter referred to as an upper and lower clamping part 53). The pair of upper and lower clamping parts 53 are formed so as to protrude from the upper and lower ends of the covering part 51 toward the inner side in the left-right direction of the heat transfer part 2, and respectively cover the upper and lower sides of the corner part 21 of the heat transfer part 2. Further, the pair of upper and lower clamping parts 53 clamps the corner part 21 of the heat transfer part 2 from both the upper and lower sides.

  Each of the upper and lower clamping portions 53 is provided with a plurality of through holes 531 that pass through in the thickness direction (vertical direction in the present embodiment) and circulate the combustion exhaust gas. In addition, an engagement piece portion 532 that engages with the heat transfer tube 3 of the corner portion 21 of the heat transfer portion 2 is provided at the distal end portion of each upper and lower clamping portion 53. The engagement piece portion 532 of the upper upper and lower clamping portion 53 is bent downward and hooked inside the innermost heat transfer tube 3 (see FIG. 3). On the other hand, the engaging piece portion 532 of the lower upper and lower clamping portion 53 is bent upward and hooked inside the innermost heat transfer tube 3 (not shown). 7 and 8 show the engagement piece 532 in a state before being bent. Moreover, the engagement piece part 532 can also be set as the structure engaged with the heat exchanger tubes 3 other than the above.

Next, the effect of the heat exchanger 1 of this embodiment and the hot water heater 8 using the same will be described.
In the heat exchanger 1 of the present embodiment, the holding member 5 includes a covering part 51 and a pair of front and rear clamping parts 52. And the coating | coated part 51 and a pair of front-and-back clamping part 52 have covered the corner part 21 of the heat-transfer part 2 from the outer side in the left-right direction and the front-back direction. As a result, the spacer 4 disposed between the heat transfer tubes 3 of the corner portion 21 can be prevented from falling off. Moreover, in the corner part 21 of the heat transfer part 2, position shift / expansion of the heat transfer tube 3 (particularly position shift / expansion to the outside of the heat transfer tube 3 in the left-right direction and the front-rear direction) can be suppressed.

  Further, as described above, the holding member 5 covers the corner portion 21 of the heat transfer portion 2 from the outside by the covering portion 51 and the pair of front and rear holding portions 52, and the corner of the heat transfer portion 2 by the pair of front and rear holding portions 52. The part 21 is clamped from both sides in the left-right direction. Therefore, the heat transfer part 2 in the state where the spacer 4 is interposed between the heat transfer tubes 3 can be sufficiently and reliably held and positioned. Thereby, the space | interval of the heat exchanger tubes 3 regulated by the spacer 4 and the arrangement | positioning position of each heat exchanger tube 3 can be maintained, and the performance (thermal efficiency etc.) of the heat exchanger 1 can be maintained in a high state. .

  Further, by configuring the holding member 5 as one component, it is possible to easily prevent the spacer 4 from falling off and hold and position the heat transfer section 2 (heat transfer tube 3) with a small number of components, that is, a simple configuration. can do. As a result, the number of parts can be reduced and the manufacturing / assembly process can be facilitated.

  Further, in the present embodiment, a pair of holding pieces 522 are provided in the front and rear holding portion 52 of the holding member 5. For this reason, in the corner portion 21 of the heat transfer section 2, it is possible to suppress the displacement / expansion of the heat transfer tube 3 (particularly, the displacement / expansion to the outside of the heat transfer tube 3 in the vertical direction). Thereby, the heat transfer part 2 can be more reliably held and positioned by the holding member 5.

  A plurality of through holes 521 are provided in the front-rear holding part 52 of the holding member 5. Therefore, it is possible to prevent the front / rear holding part 52 of the holding member 5 from obstructing the flow of the combustion exhaust by circulating the combustion exhaust through the through hole 521 of the front / rear holding part 52. Thereby, the performance (thermal efficiency etc.) of the heat exchanger 1 can be maintained in a high state.

  The holding member 5 further includes a pair of upper and lower clamping parts 53 in addition to the covering part 51 and the pair of front and rear clamping parts 52. Therefore, the corner part 21 of the heat transfer part 2 can be clamped not only from the front-rear direction but also from the vertical direction. Thereby, the heat transfer part 2 can be more reliably held and positioned by the holding member 5.

  Further, an engagement piece portion 532 is provided in the upper and lower clamping portion 53 of the holding member 5. Therefore, it is possible to prevent the holding member 5 from coming off from the corner portion 21 of the heat transfer portion 2. Thereby, the heat transfer part 2 can be more reliably held and positioned by the holding member 5.

  A plurality of through holes 531 are provided in the upper and lower clamping portion 53 of the holding member 5. Therefore, by causing the combustion exhaust gas to flow through the through hole 531 of the upper and lower clamping part 53, it is possible to prevent the upper and lower clamping part 53 from obstructing the flow of the combustion exhaust gas. Thereby, the performance (thermal efficiency etc.) of a heat exchanger can be maintained in a high state.

  In addition, the water heater 8 of the present embodiment includes the heat exchanger 1 described above. Therefore, the water heater 8 has an effect that the spacer 4 can be prevented from falling off and the heat transfer section 2 can be held and positioned sufficiently and reliably in the heat exchanger 1 with a simple configuration. Can be obtained.

  As described above, according to the present embodiment, the heat exchanger 1 that can prevent the spacer 4 from falling off and can hold and position the heat transfer section 2 sufficiently and reliably while having a simple configuration. The water heater 8 using the same can be provided.

Note that the present invention is not limited to the first embodiment described above, and it is needless to say that the present invention can be implemented in various modes without departing from the present invention.
For example, in Embodiment 1 described above, the flow direction of the combustion exhaust with respect to the heat transfer section 2 of the heat exchanger 1 is the front-rear direction (second direction) of the heat transfer section 2, but is not limited to this direction. There may be other directions.

  In the first embodiment described above, the heat exchanger 1 is configured such that the holding member 5 is disposed in both the corner portions 21 of the heat transfer unit 2, but the holding member 5 is disposed in one corner portion 21. It is good also as composition to do. Further, for example, the holding member 5 may be disposed in both the corner portions 21 in the manufacturing process of the heat transfer portion 2 and the holding member 5 may be removed from the one corner portion 21 after manufacture.

DESCRIPTION OF SYMBOLS 1 ... Heat exchanger 2 ... Heat transfer part 21 ... Corner part 22 ... Connection part 3 ... Heat transfer tube 4 ... Spacer 5 ... Holding member 51 ... Covering part 52 ... Front and rear clamping part (2nd direction clamping part)

Claims (3)

A heat transfer section configured by spirally winding one or a plurality of heat transfer tubes arranged on the same plane;
The heat transfer section is disposed opposite to the first direction orthogonal to the winding axis direction, and has a pair of corner sections formed by folding the heat transfer pipe, and a pair of connection sections that connect the pair of corner sections. And
Each corner portion is provided with a spacer interposed between the heat transfer tubes adjacent in the winding axis direction,
At least one of the pair of corner portions is provided with a holding member that holds the corner portions,
The holding member includes a covering portion that covers the corner portion and the spacer disposed in the corner portion from the outside in the first direction of the heat transfer portion, and the first direction of the heat transfer portion from the covering portion. A pair of first parts that cover both sides of the corner portion in the second direction perpendicular to the winding axis direction and the first direction, and sandwich the corner portion from both sides in the second direction. It possesses a bidirectional sandwiching section,
At both ends in the winding axis direction of the holding member in the second direction sandwiching portion, it protrudes toward the inner side in the second direction of the heat transfer section, and the corner portion extends in the winding axis direction. A pair of holding pieces that are held down from both sides are provided.
The holding member protrudes from the covering portion toward the inside of the first direction of the heat transfer portion, covers each side of the corner portion in the winding axis direction, and covers the corner portion in the winding axis direction. A pair of winding axis direction clamping portions that are clamped from both sides of the
The heat exchanger according to claim 1, wherein the holding piece portion and the winding axis direction clamping portion are arranged with a space therebetween in a direction orthogonal to the winding axis direction . 2. The heat exchanger according to claim 1 , wherein the holding member is provided with a through hole penetrating in the thickness direction in the second direction clamping portion. A water heater comprising the heat exchanger according to claim 1 or 2 .

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