JP6330577B2 - Fin and tube heat exchanger - Google Patents

Description

  The present invention relates to a fin-and-tube heat exchanger combining a plate-like fin and a flat tube.

  Conventionally, as a heat exchanger for an air conditioner, there are many types in which a plurality of plate fins arranged in parallel to each other and round tubes arranged in parallel to each other in a direction orthogonal to the plate fins are combined. It is used.

  However, in fin-and-tube heat exchangers using round tubes, since there is a limit to increasing the density by reducing the tube pitch of round tubes, in recent years, instead of round tubes, porous flat tubes (referred to below) A fin-and-tube heat exchanger using a flat tube) has been put into practical use.

  A conventional fin-and-tube heat exchanger of this type is divided into a plurality of porous flat tubes arranged parallel to each other in the vertical direction and a plurality of ventilation paths through which air flows between adjacent flat tubes. A plurality of plate-like fins arranged in parallel to each other, the plate-like fins being provided with notches (tube insertion portions) for inserting the flat tubes, and the flat tubes are tubes of the plate-like fins. The thing of the structure inserted by the insertion part and joined with the peripheral part of the pipe insertion part by brazing is known (for example, refer patent document 1, 2, 3).

  The heat exchangers described in Patent Literatures 1, 2, and 3 are a plurality of louvers that extend up and down in the heat transfer portion that constitutes the side surface of the ventilation path of the plate-like fins, and a bulging portion that extends in a direction crossing the air passage direction. Or, by providing the bulging part and the louver, moisture in the air adheres as frost, especially when it functions as an evaporator at low temperatures as a heat exchanger for an outdoor unit of an air conditioner The time required for the defrosting operation at the time is reduced.

  Moreover, the heat exchanger of patent document 1, 2, 3 has formed the drainage path by providing the uneven | corrugated rib for water conveyance in the front and back extended in the up-down direction in the leeward side board part of a plate-shaped fin.

JP 2012-154001 A (FIGS. 14 and 15) JP2012-163317A (FIG. 9) JP2012-163320A (FIG. 4)

  However, the ones described in Patent Documents 1, 2, and 3 have a so-called comb shape in which the plate-like fin has a plurality of tube insertion portions opened at one end in the width direction, so that the drainage path is one side surface of the flat tube. Therefore, the drainage route is insufficient.

  Therefore, the drainage of the condensed water (condensation water) adhering to the other side surface of the flat tube, that is, the opening side of the tube insertion portion exposed to the outside, is insufficient or takes time, increasing the ventilation resistance and decreasing the heat exchange efficiency. There are concerns.

  The present invention has been made in view of the above circumstances, and has a fin-and-tube type heat which sufficiently drains condensed water (condensed water) adhering to the surface and suppresses adverse effects on ventilation resistance and heat exchange efficiency. It is an object to provide an exchanger.

In order to achieve the above object, a fin-and-tube heat exchanger according to the present invention includes a plurality of flat tubes arranged in parallel to each other in the vertical direction and arranged in parallel to each other in a direction orthogonal to the flat tubes. A fin-and-tube heat exchanger comprising a plurality of plate-like fins, wherein the plate-like fins are open at one end in the width direction of the plate-like fins and extend in the width direction. The flat tube has a flange extending along the flat tube at least at one end in the width direction of the flat tube, and is provided with an appropriate pitch in the longitudinal direction of the flat tube. was made by forming a plurality of cut-and-raised pieces caused outright through cuts, the flat tube in the state of being inserted into the tube insertion groove of the plate-shaped fins, the cut and raised piece at least one There as well as contact with the plate-like fin located above the tube insertion groove, protrudes to the outside of the plate fin, characterized in that (claim 1).

  With this configuration, water that has condensed on the surface of the plate-like fins to form water droplets (condensed water, condensed water) is cut in a state where water is retained between the plate-like fins located above the flat tube. When the edge portion of the raised piece comes into contact with the water retention, it becomes a starting point to flow down, and water can be cut up and drawn into the gap for drainage between the pieces and discharged sequentially to the plate-like fins on the lower side of the flat tube.

Further, according to the first aspect of the present invention, the water (condensed water and condensed water) retained between the plate fins and the cut water are cut by positioning at least a part of the raised and raised pieces in the tube insertion groove. Contact with the raised piece can be increased, and discharge of water (condensed water, condensed water) can be increased.

In the present invention, the plurality of cut-and-raised pieces are arranged parallel to each other, preferably flowing water channel to the cut-and-lifted pieces are formed (claim 2).

  By comprising in this way, the water (condensed water, dew condensation water) water-retained between all the plate-like fins can be cut up and drawn into the flowing water channel formed between the pieces and discharged.

In the present invention, it is preferable that the cut and raised pieces are cut and raised in an inclined manner (claim 3 ).

  By comprising in this way, the edge part which has the angle | corner which exists in the edge part of the cut-and-raised piece cut-and-raised in an inclined shape via a notch in a collar part can be formed. Thereby, when the edge part which has a corner contacts water retention, water (condensed water, dew condensation water) cuts and raises, and flows into the gap for drainage between adjacent cut and raised pieces, for example, a flow channel, across the pieces.

Moreover, in this invention, the said eaves part is extended in the both ends of the width direction of the said flat tube, and the said cut-and-raised piece is formed in the said eaves part located in the said tube insertion groove | channel. Preferred (claim 4 ).
In addition, in the present invention, the plate fin and the flat tube are brazed in a state where a collar portion is provided in the tube insertion groove of the plate fin, and the flat tube is inserted into the tube insertion groove and the collar portion. (Claim 5 ).

With this configuration, the water drainage (condensed water, condensed water) retained between the plate-like fins is cut into the flanges extending at both ends in the width direction of the flat tube through the cuts. Since it is formed by the raised and raised pieces that are raised, water (condensed water, condensed water) retained between the plate-like fins at both ends in the width direction of the flat tube is cut and the adjacent raised and raised portions are sandwiched. It can be poured into a gap for drainage between pieces, for example, a flowing water channel. Further, a gap for drainage between the cut and raised pieces, for example, a flow channel, can be formed by the cut and raised pieces that are cut and raised through the notches at both ends of the flat tube in the width direction. Therefore, it is possible to mass-produce flat tubes having cut-and-raised pieces (drain gaps, flowing water channels) without warping by a simple construction method.
Further, by providing a collar part in the tube insertion groove of the plate-like fin and brazing the plate-like fin and the flat tube with the flat tube inserted into the tube insertion groove and the collar part, the plate-like fin and the flat tube Can be firmly brazed and joined.

  According to this invention, since it is configured as described above, the following effects can be obtained.

  (1) According to the invention described in claim 1, water (condensed water or condensed water) condensed on the surface of the plate-like fins to form water droplets is retained between the plate-like fins located above the flat tube. In this state, the edge part of the cut and raised piece comes into contact with the water retention, and it becomes the starting point to flow down, and the water is cut and attracted to the gap for drainage between the pieces to sequentially form the plate-like fins on the lower side of the flat tube. Can be discharged. Therefore, even when the flat tube is horizontally arranged, the drainage of the condensed water (condensation water) attached to the surface can be made sufficient, and adverse effects on the ventilation resistance and the heat exchange efficiency can be suppressed.

(2) According to the invention described in claim 1 , water (condensed water, condensed water) is retained between the plate-like fins by positioning at least a part of the cut and raised pieces in the tube insertion groove. ) And the cut and raised pieces can be increased, and in addition to the above (1), the drainage of water (condensed water, condensed water) can be further enhanced.

(3) According to the invention described in claim 2 , the water (condensed water, condensed water) retained between all the plate-like fins is cut up and drawn into the flow channel formed between the pieces and discharged. Therefore, in addition to the above (1) and (2), the drainage of water (condensed water and condensed water) can be further improved, and adverse effects on the ventilation resistance and heat exchange efficiency can be suppressed. it can.

(4) According to the invention described in claim 3 , water (condensed water, condensed water) is cut and raised between the adjacent cut and raised pieces with the edge portion having a corner contacting water retention. In addition to the above (1) to (3), the drainage performance can be further improved.

(5) According to the invention described in claim 4, water (condensed water, condensed water) retained between the plate-like fins at both ends in the width direction of the flat tube is cut up and adjacently sandwiched between the pieces. Since it can be made to flow into the gap for drainage between the raising pieces, for example, both flow channels, in addition to the above (1) to (4), the drainage can be further improved. In addition, it is possible to mass-produce flat tubes with cut-and-raised parts (drain gaps between the raised and raised pieces, flowing water channels) with a simple construction method, making it easy to assemble the heat exchanger be able to.
(6) According to the invention described in claim 5 , the plate-like fin and the flat tube are connected in a state where the collar portion is provided in the tube insertion groove of the plate-like fin and the flat tube is inserted into the tube insertion groove and the collar portion. By brazing, in addition to the above (1) to (5), the plate-like fin and the flat tube can be brazed and joined firmly.

It is a schematic side view which shows an example of the fin and tube type heat exchanger which concerns on this invention. It is a perspective view which shows the principal part of 1st Embodiment of the fin and tube type heat exchanger which concerns on this invention. It is the front view (a) which shows the attachment state of the flat tube and plate-shaped fin in 1st Embodiment, and its side view (b). It is a schematic side view which shows the principle of the waste_water | drain using the cut and raised piece in this invention. It is a principal part side view which shows the state which provided the collar part in the fin insertion groove of the plate-shaped fin in this invention. It is the perspective view (a) which shows the state before providing a cut and raised piece in the flat tube in 1st Embodiment, and the perspective view (b) which shows the state which provided the cut and raised piece. It is a front view which shows the attachment state of the flat tube and plate-shaped fin in 2nd Embodiment of the fin and tube type heat exchanger which concerns on this invention. It is a perspective view which shows the flat tube in 2nd Embodiment.

  EMBODIMENT OF THE INVENTION Below, the form for implementing the fin and tube type heat exchanger which concerns on this invention is demonstrated in detail based on an accompanying drawing. Here, the case where the fin and tube type heat exchanger according to the present invention is applied to an outdoor unit of an air conditioner will be described.

  The fin-and-tube heat exchanger 1 (hereinafter referred to as heat exchanger 1) is a first pair of header pipes each made of an aluminum (including aluminum alloy) member, as shown in FIG. Header pipe 1a, second header pipe 1b, a plurality of flat tubes 3 made of aluminum arranged parallel to each other in the horizontal vertical direction connected to both header pipes 1a, 1b, and a direction perpendicular to the flat tubes 3 And a plurality of aluminum plate-like fins 2 arranged in parallel with each other, and are integrally formed by brazing. In this case, the flat tube 3 is formed in a flat elliptical shape, and a plurality of fluid flow paths 3 a are defined in the width direction orthogonal to the longitudinal direction of the flat tube 3.

  The first and second header pipes 1a and 1b are formed of an aluminum extruded shape member or an electric sewing tube, and the upper and lower open ends are respectively closed by brazing an end cap 1c made of aluminum. Yes.

  In this embodiment, partition plates 4 are provided at two locations, the upper portion and the lower portion of the hollow portion in the first header pipe 1a, and the upper and lower spaces 11a, 11b, A lower space 11c is partitioned. The first refrigerant flow pipe 5 is communicated with the upper space 11a of the first header pipe 1a, and the second refrigerant flow pipe 6 is communicated with the lower space 11c.

  On the other hand, a partition plate 4 is provided in the middle of the hollow portion in the second header pipe 1b, and the upper space 11d and the lower space 11e are partitioned vertically by this partition plate 4.

By configuring as described above, the upper heat exchange region 12A is formed by the flat tube 3 communicating with the upper space 11a of the first header pipe 1a and the upper space 11d of the second header pipe 1b, and the first header An intermediate heat exchange region 12B is formed by the flat tube 3 that communicates the intermediate space 11b of the pipe 1a with the upper space 11d and the lower space 11e of the second header pipe 1b, and the lower space 11c of the first header pipe 1a and the first space A lower heat exchange region 12C is formed by the flat tube 3 communicating with the lower space 11e of the second header pipe 1b.

  In the heat exchanger 1 configured as described above, when used as an evaporator, when a liquid or gas-liquid refrigerant flows into the lower space 11c of the first header pipe 1a from the second refrigerant flow pipe 6, The refrigerant flows through the fluid flow path 3a of each flat tube 3 in the lower heat exchange region 12C and joins in the lower space 11e of the second header pipe 1b. The refrigerant merged in the lower space 11e flows through the fluid flow path 3a of each flat tube 3 in the intermediate heat exchange region 12B and merges in the intermediate space 11b of the first header pipe 1a, and then the intermediate heat exchange region 12B. These flow through the fluid flow path 3a of each flat tube 3 and join in the upper space 11d of the second header pipe 1b. The refrigerant merged in the upper space 11d flows through the fluid flow path 3a of each flat tube 3 in the upper heat exchange region 12A and merges into the upper space 11a "of the first header pipe 1a". Then, the refrigerant merged in the upper space 11 a flows out from the first refrigerant flow pipe 5.

  Next, the attachment structure of the plate-like fins 2 and the flat tubes 3 that are characteristic portions of the heat exchanger 1 according to the present invention will be described.

<First Embodiment>
As shown in FIGS. 2 and 3, the plate-like fin 2 is provided with tube insertion grooves 2 a that are open at one end in the width direction and extend in the width direction at equal intervals in the vertical direction. Yes. A plurality of louvers (not shown) extending in the vertical direction are provided on the side surfaces of the plate-like fins 2 located between the flat tubes 3 in order to improve heat exchange efficiency.

  As shown in FIG. 5A, the flat tube 3 is formed of an extruded aluminum member that has a thin flange 7 extending along the flat tube 3 at one end in the width direction of the flat tube 3. Thereafter, as shown in FIG. 5 (b), the flange portion 7 is adjacent to each other by a plurality of parallel raised and raised pieces 8 which are cut and raised through notches provided at an appropriate pitch in the longitudinal direction of the flat tube 3. A gap for drainage, for example, a flow channel 10 is formed between the cut and raised pieces 8. In this case, the cut and raised piece 8 is formed in an inclined shape. Thus, the edge part 9 which has the angle | corner 9a which exists in the edge part of the cut-and-raised piece 8 is formed by cutting and raising the piece 8 in an inclined shape through the notch in the collar part 7 (FIG. 4).

  Further, as shown in FIGS. 2 and 3 (a), when the flat tube 3 is inserted into the tube insertion groove 2a of the plate-like fin 2, the cut and raised piece 8 is at least partially in the tube insertion groove 2a. Is located. In this case, the length of the cut-and-raised piece 8 positioned in the tube insertion groove 2a is increased to make contact with water (condensed water, condensed water) retained between the edge portion 9 and the plate-like fins 4. It can be increased and drainage can be improved.

  By configuring as described above, water (condensed water, condensed water) condensed on the surface of the plate-like fins 2 and forming water droplets was retained between the plate-like fins 2 located above the flat tube 3. In this state, when the edge portion 9 of the cut and raised piece 8 (flow channel 10) comes into contact with the water retention, it becomes a starting point to flow down, attracting water into the flow channel 10 and the plate-like fin 2 on the lower side of the flat tube 3 Can be discharged. That is, as shown in FIG. 4, the edge portion 9 having the corner 9a present at the end portion of the cut-and-raised piece 8 that is cut and raised in an inclined shape through the notch in the collar portion 7 comes into contact with the water retention, (Condensed water, condensed water) is cut up and flows down to the adjacent two-way water channel 10 across the piece 8. In this way, the water (condensed water and condensed water) that has flowed down the flow channels 10 of each cut and raised piece 8 sequentially flows through the cut and raised pieces 8 (flow channel 10) formed in the lower flat tube 3. And discharged to the lower part of the heat exchanger 1.

  Therefore, even when the flat tube 3 is horizontally arranged, it can have sufficient drainage, and the heat exchange efficiency can be improved by suppressing the ventilation resistance.

Second Embodiment
The second embodiment is a case where drainage mechanisms are provided at both ends of the flat tube 3 in the width direction.

  That is, as shown in FIGS. 6 and 7, the heat exchanger 1 </ b> A according to the second embodiment has the flanges 7 extending at both ends in the width direction of the flat tube 3, Similarly to the above, the flowing water channel 10 is formed between the adjacent raised and raised pieces 8 by a plurality of inclined raised and raised pieces 8 that are cut and raised through the cuts provided at an appropriate pitch in the longitudinal direction of the flat tube 3. Is formed.

  By configuring in this way, water that has condensed into the surface of the plate-like fins 2 at the both ends in the width direction of the flat tube 3, that is, the front side and the rear side of the heat exchanger 1 </ b> A, becomes water droplets (condensed water, condensation) Water) is retained between the plate-like fins 2 located on the upper side of the flat tube 3, and when the edge portion 9 of the cut and raised piece 8 (flow channel 10) comes into contact with the retained water, it becomes a starting point to flow down, Water can be attracted and discharged to the plate-like fins 2 on the lower side of the flat tube 3. That is, as shown in FIG. 4, the edge portion 9 having the corner 9a present at the end portion of the cut-and-raised piece 8 that is cut and raised in an inclined shape through the notch in the collar portion 7 comes into contact with the water retention, (Condensed water, condensed water) is cut up and flows down to the adjacent two-way water channel 10 across the piece 8. Thus, the water (condensed water and condensed water) that has flowed down the both flowing water passages 10 of the cut and raised pieces 8 provided at both ends in the width direction of the flat tube 3 is the both end portions in the width direction of the flat tube 3. That is, it flows through the cut and raised pieces 8 (flow channel 10) formed in the flat tube 3 on the lower side sequentially from the two drainage paths on the front side and the rear side of the heat exchanger 1A and is discharged to the lower part of the heat exchanger 1A. Is done.

  Therefore, even when the flat tube 3 is horizontally arranged, it is possible to have further sufficient drainage, and the heat exchange efficiency can be improved by suppressing the ventilation resistance.

  In addition, according to the second embodiment, the cut and raised pieces are formed by cutting the flowing water passages 10 between the cut and raised pieces 8 into the flange portions 7 extending at both ends in the width direction of the flat tube. Therefore, the flat tube 3 is less likely to be warped during scissors processing, and the flat tube 3 having the cut and raised piece 8 (flow channel 10) without warping is mass-produced by a relatively simple construction method. Therefore, the assembly of the heat exchanger can be facilitated.

<Other embodiments>
In the above embodiment, the case where the cut-and-raised piece 8 is at least partially located in the tube insertion groove 2a has been described. However, the cut-and-raised piece 8 contacts at least the plate-like fin 2 and the plate-like fin 2 It may be projected to the outside.

  By comprising in this way, the water (condensed water, dew condensation water) retained between the plate-like fins 2 flows along the cut-and-raised pieces 8 that come into contact with the plate-like fins 2, and the cut-and-raised pieces 8 ( When the edge portion 9 of the water flow channel 10) comes into contact with the water retention, it becomes a starting point to flow down, and water can be attracted into the water flow channel 10 and discharged to the plate-like fins 2 on the lower side of the flat tube 3.

  Moreover, in the said 1st Embodiment, while extending the collar part 7 at the one end part of the width direction of the flat tube 3, it cuts and raises through the notch provided in the longitudinal direction of the flat tube 3 at appropriate pitches. Although the case where the flowing water channel 10 is formed between the adjacent cut and raised pieces 8 by the plurality of inclined cut and raised pieces 8 has been described, the flange portions 7 are extended at both ends in the width direction of the flat tube 3. Alternatively, a structure may be adopted in which the cut piece 8 (flow channel 10) is formed on one flange portion 7 and the cut piece 8 (flow channel 10) is not formed on the other flange portion 7.

In the above embodiment has described the case of inserting the flat tube 3 in the tube insertion groove 2a provided in the plate-like fins 2, as shown in FIG. 4A, collar tube insertion groove 2a of the plate-like fins 2 the part 2b is provided, the flat tubes 3 may be inserted into the tube insertion groove 2a and the collar portion 2b. By doing in this way, the plate-like fin 2 and the flat tube 3 can be firmly brazed and joined.

1a 1st header pipe 1b 2nd header pipe 2 Plate-like fin 2a Tube insertion groove
2b Collar part 3 Flat tube 7 Gutter part 8 Cut and raised piece 9 Edge part 9a Corner 10 Flow channel

Claims (5)

A fin-and-tube heat exchanger comprising a plurality of flat tubes arranged parallel to each other in the vertical direction and a plurality of plate-like fins arranged parallel to each other in a direction perpendicular to the flat tubes. And
The plate-like fin is provided with a tube insertion groove that is open at one end in the width direction of the plate-like fin and extends in the width direction,
The flat tube has a flange extending along the flat tube at least at one end in the width direction of the flat tube, and through a notch provided in the flange with an appropriate pitch in the longitudinal direction of the flat tube. A plurality of cut and raised pieces to be cut and raised,
In a state where the flat tube is inserted into the tube insertion groove of the plate-like fin, the cut and raised piece is at least partially located in the tube insertion groove and contacts the plate-like fin , and the plate-like fin Protruding outside,
A fin-and-tube heat exchanger. The fin-and-tube heat exchanger according to claim 1 ,
The fin-and-tube heat exchanger, wherein the plurality of cut and raised pieces are arranged in parallel to each other, and a flow channel is formed between the cut and raised pieces. In the fin-and-tube heat exchanger according to claim 1 or 2 ,
A fin-and-tube heat exchanger, wherein the cut and raised pieces are cut and raised in an inclined shape. In the fin and tube type heat exchanger according to any one of claims 1 to 3 ,
The fin is characterized in that the flange is extended at both ends in the width direction of the flat tube, and the cut-and-raised piece is formed in the flange located in the tube insertion groove. And tube type heat exchanger. The fin-and-tube heat exchanger according to any one of claims 1 to 4 ,
A collar portion is provided in a tube insertion groove of the plate-like fin, and the plate-like fin and the flat tube are brazed in a state where the flat tube is inserted into the tube insertion groove and the collar portion. Fin and tube heat exchanger.

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