JP2012251719A - Drainage structure of corrugated fin type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage structure of a corrugated fin type heat exchanger which structure improves drainage between heat exchanger tubes and corrugated fins and discharge rate of a large volume of water due to condensation.SOLUTION: In the corrugated fin type heat exchanger, a plurality of flat heat exchanging tubes 3 parallel to each other are arranged horizontally across a pair of opposed header pipes 2a and 2b, and corrugated fins 4 are joined between the heat exchanging tubes, on the outer surfaces of lateral ends of the heat exchanging tubes, a plurality of water channels 10 are formed at proper pitches in the longitudinal direction of the heat exchanging tubes, the water channels that absorb water remaining between the heat exchanging tubes and the corrugated fins vertically adjacent thereto, and a plurality of linear water-guide members 20 are arranged horizontally at proper pitches such as to be in contact with the lateral surfaces of the vertically arranged corrugated fins to guide water downward.

Description

  TECHNICAL FIELD The present invention relates to a drainage structure for a corrugated fin heat exchanger, and more specifically, drainage that improves drainage of a parallel flow heat exchanger in which corrugated fins and flat heat exchange tubes are alternately arranged. Concerning structure.

  Generally, corrugated fin-type heat exchangers are widely used in which a plurality of flat heat exchange tubes parallel to each other are horizontally arranged between a pair of opposing header pipes and corrugated fins are joined between the heat exchange tubes. in use. When this type of corrugated fin heat exchanger is used as an evaporator, condensed water (condensed water) adheres to the surface, increasing the airflow resistance, and further, the water film adhering to the corrugated fin surface acts as a resistance to transfer heat. There is a problem that the heat exchange performance is lowered.

  In order to solve the above problem, the inventor has intensively studied, and as a result, sucked water retained between corrugated fins adjacent to the upper and lower sides of the heat exchange tube on the outer surface of the end portion in the width direction of the heat exchange tube. A drainage structure has been proposed in which a plurality of flowing water channels are formed with an appropriate pitch in the longitudinal direction (horizontal direction) of the heat exchange tube (see, for example, Patent Document 1).

  According to the technique described in Patent Document 1, it is possible to drain condensed water (condensation water) adhering to the surface even when the heat exchange tubes are horizontally arranged.

  Moreover, as a structure for draining condensed water (condensation water) adhering to the heat exchanger surface downward, a heat exchanger is known in which guide plates in contact with the corrugated fins are provided at an appropriate pitch in the horizontal direction ( For example, see Patent Document 2).

  In addition, as another structure for draining the condensed water (condensation water) adhering to the heat exchanger surface, the drainage guide that contacts the corrugated fin is composed of a linear member, and the drainage guide is inclined with respect to the heat exchanger. An arranged drainage structure is known (see, for example, Patent Document 3).

JP 2010-243147 A (Claims, FIGS. 1 to 3) JP 2001-263861 A (Claim 1, FIG. 3) Japanese Patent Laying-Open No. 2007-285673 (Claims, FIGS. 3, 5 to 12)

  However, in the technique described in Patent Document 1, drainage between the heat exchange tube and the corrugated fin can be improved by the flow channel formed in the heat exchange tube, but for example, it is used as an outdoor heat exchanger. When a large amount of discharged water flows during the defrosting operation or the like, there is a concern that the drainage speed of the entire heat exchanger becomes insufficient and the defrosting time becomes longer.

  Further, in the techniques described in Patent Documents 2 and 3, when high drainage is required, it is necessary to dispose a drainage guide composed of many guide plates and linear members at a relatively narrow pitch. There is a concern that the flow of wind passing through the air flow may be hindered and the ventilation resistance increased.

  This invention was made in view of the above circumstances, and is a corrugated fin heat exchanger that can improve drainage between a heat exchange tube and a corrugated fin and improve the drainage speed of a large amount of discharged water. It is an object to provide a drainage structure.

  In order to achieve the above object, the corrugated fin heat exchanger drainage structure of the present invention has a plurality of parallel flat heat exchange tubes arranged horizontally between a pair of opposing header pipes, In the corrugated fin type heat exchanger formed by joining between the heat exchange tubes, between the corrugated fins adjacent to the upper and lower sides of the heat exchange tubes on the outer end surface in the width direction of the heat exchange tubes. A plurality of flow channels for sucking water to be retained are formed at an appropriate pitch in the longitudinal direction of the heat exchange tube, and are linearly brought into contact with the surface in the width direction of the corrugated fin located in the vertical direction to guide the water downward A plurality of the water guide members are arranged at an appropriate pitch in the horizontal direction.

  By configuring in this way, the water retained between the heat exchange tube and the corrugated fin can flow through the flow channel, and the water remaining without flowing from the flow channel can be passed through the water guide member. It can flow to the lower side of the heat exchanger.

  In the present invention, the flowing water channel is formed by a cut and raised piece obtained by cutting and raising the flange extending at the end in the width direction of the heat exchange tube, and the proximal end side of the flange It is more preferable to form it leaving a flat part.

  By comprising in this way, the water which remained without flowing from a flowing water channel flows through a flat part, and flows into the lower part side of a heat exchanger via a water guide member.

  Moreover, in this invention, it is better to suspend the said water conveyance member from the lowest end of the heat exchanger core which consists of said several heat exchange tube and a corrugated fin.

  This drooping length depends on the range of water retained between the corrugated fins at the bottom of the heat exchanger. It is preferable that the height (height) or more. Further, this water retention range is not constant because it varies depending on the pitch, width, height, thickness of the heat exchange tube, and the like of the corrugated fins. In addition, when the drooping length is short, the water retained in the lower part of the heat exchanger cannot be surely discharged.

  Moreover, in this invention, it is preferable to arrange | position the drain pan which receives waste_water | drain at the lower part of the said heat exchanger, and to make the lower end of the said water conveyance member contact the said drain pan.

  By comprising in this way, the condensed water (condensation water) adhering to the heat exchanger surface can be received with the drain pan arrange | positioned below.

  In the present invention, the water guiding member may be formed of a wire, or may be formed in a shape in which a plurality of linear materials are formed, and a water channel may be formed in a gap between the linear materials.

  About the pitch which arrange | positions a water conveyance member, although the drainage speed | velocity | rate improves as the pitch is narrow, on the contrary, ventilation resistance increases. The increase in ventilation resistance, for example, in a stationary device, when a fan is used for blowing air to the heat exchanger, leads to an increase in blowing power or a decrease in the blowing amount, resulting in deterioration of the energy consumption efficiency of the device and heat exchange performance. There is concern about the decline. For this reason, when determining the pitch, it is preferable to consider the heat exchange performance of the heat exchanger, the ventilation resistance, and the characteristics of the fan used.

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

  (1) The water retained between the heat exchange tube and the corrugated fin can flow through the flow channel, and the water remaining without flowing from the flow channel passes through the water guide member to the lower part of the heat exchanger. Therefore, it is possible to improve the drainage between the heat exchange tube and the corrugated fin, and to improve the drainage rate of a large amount of discharged water.

  (2) The flowing water channel is formed by a cut-and-raised piece obtained by cutting and raising the flange extending at the end in the width direction of the heat exchange tube, and flat on the proximal end side of the flange By forming the remaining part, the remaining water without flowing from the flow channel flows through the flat part and flows to the lower side of the heat exchanger through the water guide member. Can be increased.

  (3) By ensuring an appropriate drooping length from the lowermost end of the heat exchanger core composed of the plurality of heat exchange tubes and corrugated fins, the water guide member is secured to the lower part of the heat exchanger (specifically, the lower two stages In addition to the above (1), the drainage can be further improved.

  (4) A drain pan that receives drainage at the bottom of the heat exchanger, and the drain that has condensed water (condensation water) attached to the surface of the heat exchanger disposed below by bringing the lower end of the water guiding member into contact with the drain pan. You can catch it with bread. Therefore, in addition to the above (1) and (2), drainage around the lower portion of the heat exchanger can be further promoted.

It is the I section expansion front view (b) of (a) and (a) which shows a 1st embodiment of the drainage structure of the corrugated fin type heat exchanger concerning this invention. They are a perspective view (a) which shows a part of drainage structure concerning a 1st embodiment in section, and a partial expansion perspective view (b) of a corrugated fin in this invention. It is a perspective view which shows another shape of the heat exchange tube which has a flowing water path in 1st Embodiment. It is a perspective view which shows a part of 2nd Embodiment of the drainage structure of the corrugated fin type heat exchanger which concerns on this invention in a cross section. It is a perspective view which shows the heat exchange tube which has a flowing water path in 2nd Embodiment. It is principal part sectional drawing which shows the relationship between the water flow path in 2nd Embodiment, a water guide member, and a corrugated fin. It is an expansion perspective view which shows the relationship between the water flow path in 2nd Embodiment, a water guide member, and a corrugated fin. It is principal part sectional drawing (a) which shows the relationship between the flow channel in 3rd Embodiment, a water conveyance member, and a corrugated fin, and an expanded sectional view (b) of a water conveyance member.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated in detail based on an accompanying drawing.

<First Embodiment>
As shown in FIG. 1, a corrugated fin heat exchanger 1 (hereinafter referred to as a heat exchanger 1) according to the present invention includes a pair of header pipes 2a and 2b that are made of aluminum (including an aluminum alloy) and that face each other. A plurality of flat heat exchange tubes 3 installed (connected) in parallel with each other between the header pipes 2a and 2b, a corrugated fin 4 interposed between adjacent heat exchange tubes 3, and a vertical direction A plurality of linear water guide members 20 that are in contact with the surface in the width direction of the corrugated fins 4 positioned in the direction and guide water downward are brazed.

  In this case, the heat exchange tube 3 is formed with a plurality of divided heat medium passages 3a, and a thick portion 3b is formed at the end in the width direction. Also, aluminum side plates 5 are brazed to the upper outer side and lower open side of the upper and lower corrugated fins 4 respectively. An end cap 6 made of aluminum is brazed to the upper and lower opening ends of the header pipes 2a and 2b.

  In addition, a drain pan 7 that receives drainage is disposed below the heat exchanger 1, and a bottom surface 7 a of the drain pan 7 is in contact with the lower end of the water guide member 20.

  In the heat exchanger 1 configured as described above, the corrugated fins 4 are formed by alternately repeating mountain-valley folding so that the thin plate has a predetermined height. , Can be viewed as a continuous V-shape. The shape of the corrugated fin 4 is not necessarily a continuous V shape, but may be a continuous U shape.

  In the heat exchanger 1 configured as described above, as shown in FIGS. 1 to 3, the outer surface of the thick portion 3 b at the end portion in the width direction of the heat exchange tube 3 is provided on the upper and lower sides of the heat exchange tube 3. A plurality of water flow paths 10 for sucking water retained between the corrugated fins 4 adjacent to the side are formed in the longitudinal direction of the heat exchange tube 3 with an appropriate pitch P1. In this case, the slit 11 is formed to be inclined with respect to a horizontal line parallel to the longitudinal direction of the heat exchange tube 3, but the slit 11 is not necessarily inclined, as shown in FIG. Alternatively, it may be orthogonal (vertical) to a horizontal line parallel to the longitudinal direction of the heat exchange tube 3.

  As a drainage mechanism of the structure formed as described above, the condensed water (condensation water) condensed on the surface of the V-shaped (valley fold) fin does not have a water channel to the lower stage, so that the corrugated fins 4 cross each other in the width direction. It moves to the adjacent inverted V-shaped (mountain fold) part via the fin louver 4a (see FIG. 2B) formed by cutting and raising a plurality of vertical slits provided in parallel, and into the inverted V-shaped part. A structure in which drained water is promoted by smoothly repeating a mechanism in which the collected condensed water flows into the corrugated fin 4 on the lower side from the lower opening through the flowing water channel 10 formed in the heat exchange tube 3. It is.

  In addition, heat exchange performance can be improved by providing the fin louver 4a in the corrugated fin 4, that is, by providing a predetermined number of louvers formed at a predetermined angle in the air passage, heat transfer performance due to the turbulent flow effect, etc. Can be improved.

  In this drainage mechanism, when the pitch P1 of the flow channel 10 formed in the heat exchange tube 3 is more than four times the pitch of the corrugated fins 4 (peak apex-valley apex dimension), the drainage with respect to the water retention capacity of the corrugated fins 4 Since there are fewer roads, the drainage speed becomes extremely slow, and a practically effective drainage effect cannot be obtained. Therefore, as shown in FIG. 1B, the pitch P <b> 1 of the flow channel 10, i.e., the slit 11, is preferably not more than four times the pitch P of the corrugated fins 4 (peak apex−valley apex dimension).

  On the other hand, the water guide member 20 is formed of, for example, an aluminum wire, and is disposed, for example, on the downstream side surface of the air in the heat exchanger 1. The water guide member 20 is not necessarily arranged on the downstream side of the air blowing in the heat exchanger 1 and may be arranged on the upstream side of the blowing or on both the upstream side and the downstream side of the blowing.

  In this case, the water conveyance member 20 includes the heat exchange tube 3 from the uppermost end to the lowermost heat exchange tube 3 of the heat exchanger core 9 including the plurality of heat exchange tubes 3 and the corrugated fins 4, and the corrugated fins interposed therebetween. 4 and the corrugated fins 4 and the side plates 5 disposed below the lowermost heat exchange tube 3 are brazed to the widthwise ends and suspended from the lowermost end of the heat exchanger core 9, It is in contact with the bottom surface 7 a of the pan 7.

  In this embodiment, the water guide member 20 is in contact with the bottom surface 7 a of the drain pan 7, but is not necessarily in contact with the bottom surface 7 a of the drain pan 7 as long as an appropriate length is suspended from the lowermost end of the heat exchanger core 9. You don't have to.

  This drooping length depends on the range of water retained between the corrugated fins at the bottom of the heat exchanger. It is preferable that the height (height) or more.

  When the pitch P between the peaks and valleys of the corrugated fins 4 is 1.3 mm and the pitch P2 between the heat exchange tubes 3 adjacent to each other is 10 mm, the range of water retained in the lower part of the heat exchanger is 2 from the lowest end of the heat exchanger. Since it becomes about a step, it becomes possible to discharge the water retained in the lower portion by ensuring a drooping length of 20 mm (= 10 mm × 2 steps) or more.

  In FIG. 1, three water guide members 20 are illustrated. However, the horizontal pitch PA of the water guide members 20 takes into consideration the heat exchange performance, the airflow resistance, and the characteristics of the fan used. Preferably, for example, when a water guide member is arranged on a wire having a wire diameter of φ2 mm, it is better to set it in a range of about 50 mm to 150 mm. In this case, the distance L between the insides of the header pipes 2a and 2b is set to 400 mm. When the pitch of the water guide members 20 is narrower than 50 mm, there is a concern that, depending on the characteristics of the fan used, the energy consumption efficiency of the device may be deteriorated and the heat exchange performance may be reduced, as the ventilation resistance increases. On the other hand, if the pitch of the water guide members 20 is wider than 150 mm, the remaining water is not sufficiently discharged without flowing from the water channel, and the drainage speed cannot be improved so much.

  By the water guide member 20 formed as described above, the water remaining without flowing from the water flow channel 10 can flow into the drain pan 7 on the lower side of the heat exchanger 1 through the water guide member 20.

  According to the drainage structure of the first embodiment, when the heat exchanger surface is in a wet state, condensed water (condensed water) that condenses on the surface of the corrugated fins 4 and becomes water droplets is formed above and below the heat exchange tube 3. In the state where water is retained between the corrugated fins 4 adjacent to the side, the edge portion of the water flow channel 10 comes into contact with the water retention, so that it begins to flow down, and water can be attracted and discharged to the corrugated fins 4 on the lower side. . In the same manner, the condensed water (condensed water) condensed on the surface of the corrugated fins 4 and forming water droplets is sequentially discharged to the corrugated fins 4 on the lower side. On the other hand, the water remaining without flowing from the flow channel 10 flows into the drain pan 7 on the lower side of the heat exchanger 1 through the water guide member 20. Thereby, even when the flat heat exchange tube 3 is horizontally arranged, the drainage speed can be increased, and the drainage performance can be improved.

Second Embodiment
As shown in FIGS. 4 to 7, the heat exchanger 1 </ b> A of the second embodiment is provided with a slit 11 cut into a flange 30 that extends horizontally at the end in the width direction of the heat exchange tube 3 </ b> A. The flow channel 10 is formed by the cut and raised pieces 32 that are cut and raised in an inclined manner, and the flat portion 31 is left on the base end side of the flange portion 30.

  In this case, similarly to the first embodiment, the water guide member 20 is formed of, for example, an aluminum wire, and heat exchange at the uppermost end of the heat exchanger core 9 including the plurality of heat exchange tubes 3 and the corrugated fins 4 is performed. The heat exchanger tube 3 at the lowermost end from the tube 3, the corrugated fins 4 interposed therebetween, the corrugated fins 4 disposed below the lowermost heat exchanger tube 3, and the end portions in the width direction of the side plates 5 At the same time, it is suspended from the lowermost end of the heat exchanger core 9 and is in contact with the bottom surface of a drain pan (not shown). Note that the water guide member 20 may not be brought into contact with the bottom surface 7 a of the drain pan 7 as long as an appropriate length is suspended from the lowermost end of the heat exchanger core 9.

  In the second embodiment, the other parts are the same as those in the first embodiment.

  According to the drainage structure of the second embodiment, when the surface of the heat exchanger becomes wet, the condensed water (condensed water) that condenses on the surface of the corrugated fins 4 and becomes water droplets is formed on the upper and lower sides of the heat exchange tube 3. In the state where the water is retained between the corrugated fins 4 adjacent to each other, the edge portion of the water flow channel 10 comes into contact with the water retaining material, so that it starts to flow down, and water can be attracted and discharged to the corrugated fins 4 on the lower side. In the same manner, the condensed water (condensed water) condensed on the surface of the corrugated fins 4 and forming water droplets is sequentially discharged to the corrugated fins 4 on the lower side. On the other hand, water remaining without flowing from the water flow channel 10 flows along the flat portion 31 along the longitudinal direction of the heat exchange tube 3 and flows into the drain pan 7 on the lower side of the heat exchanger 1 through the water guide member 20. . Thereby, even when the flat heat exchange tube 3 is horizontally arranged, the drainage speed can be increased, and the drainage performance can be improved.

<Third Embodiment>
As shown in FIG. 8, the heat exchanger 1 </ b> B of the third embodiment replaces the water guide member 20 in the first and second embodiments with a plurality of (for example, three) linear materials 21 as the water guide member 20 </ b> A. This is a case where a water channel is formed in the gap between each linear material 21.

  The water guide member 20 formed in this way is, for example, similarly to the second embodiment, the heat at the lowest end from the heat exchange tube 3 at the uppermost end of the heat exchanger core 9 including the plurality of heat exchange tubes 3 and the corrugated fins 4. The exchange tube 3, the corrugated fins 4 interposed therebetween, the corrugated fins 4 disposed below the lowermost heat exchange tube 3, and brazed to the widthwise ends of the side plates 5, and heat exchange It is suspended from the lowermost end of the vessel core 9 and is in contact with the bottom surface of a drain pan (not shown). The water guide member 20 </ b> A may not be brought into contact with the bottom surface 7 a of the drain pan 7 as long as an appropriate length is suspended from the lowermost end of the heat exchanger core 9.

  In the third embodiment, the other parts are the same as those in the first and second embodiments. Therefore, the same parts are denoted by the same reference numerals and description thereof is omitted.

  According to the drainage structure of the third embodiment, when the surface of the heat exchanger becomes wet, the condensed water (condensed water) that condenses on the surface of the corrugated fins 4 and becomes water droplets is the upper and lower sides of the heat exchange tube 3. In the state where the water is retained between the corrugated fins 4 adjacent to each other, the edge portion of the water flow channel 10 comes into contact with the water retaining material, so that it starts to flow down, and water can be attracted and discharged to the corrugated fins 4 on the lower side. In the same manner, the condensed water (condensed water) condensed on the surface of the corrugated fins 4 and forming water droplets is sequentially discharged to the corrugated fins 4 on the lower side. On the other hand, the water remaining without flowing from the water flow channel 10 flows through the flat portion 31 along the longitudinal direction of the heat exchange tube 3 and passes through the gaps between the respective linear materials 21 forming the water guide member 20A. Flows into the drain pan 7 on the lower side. Thereby, even when the flat heat exchange tube 3 is horizontally arranged, the drainage speed can be increased, and the drainage performance can be improved.

<Other embodiments>
In the above embodiment, the case where the drainage structure according to the present invention is applied to an evaporator has been described. However, in the parallel flow type corrugated fin type heat exchanger other than the evaporator, the present invention is a case where a heat exchange tube is horizontally disposed. However, it has sufficient drainage properties of water droplets adhering to the surface and can suppress adverse effects on the ventilation resistance and heat exchange efficiency.

1, 1A, 1B Heat exchanger 2a, 2b Header pipe 3 Heat exchange tube 4 Corrugated fin 7 Drain pan 7a Bottom face 9 Heat exchanger core 10 Flow channel 11 Slit 20, 20A Water guide member 21 Linear material 30 Gutter 31 Flat part 32 Cut and raised pieces

Claims (6)

In a corrugated fin heat exchanger formed by horizontally arranging a plurality of flat heat exchange tubes parallel to each other between a pair of opposing header pipes, and joining corrugated fins between the heat exchange tubes,
On the outer surface of the end portion in the width direction of each heat exchange tube, a flow channel for sucking water retained between the corrugated fins adjacent to the upper and lower sides of the heat exchange tube is appropriately pitched in the longitudinal direction of the heat exchange tube. Multiple formations,
A corrugated fin type characterized in that a plurality of linear water guiding members that contact the surface in the width direction of the corrugated fin positioned in the vertical direction and guide water downward are arranged at an appropriate pitch in the horizontal direction. Heat exchanger drainage structure. In the drainage structure of the corrugated fin heat exchanger according to claim 1,
The flowing water channel is formed by a cut and raised piece obtained by cutting and raising the flange extending at the end in the width direction of the heat exchange tube, and a flat portion is provided on the proximal end side of the flange. A drainage structure for a corrugated fin heat exchanger, characterized in that it is formed by leaving. In the drainage structure of the corrugated fin-type heat exchanger according to claim 1 or 2,
A drainage structure for a corrugated fin heat exchanger, wherein the water guiding member is suspended from the lowermost end of a heat exchanger core comprising the plurality of heat exchange tubes and corrugated fins. In the drainage structure of the corrugated fin heat exchanger according to any one of claims 1 to 3,
A drainage structure for a corrugated fin heat exchanger, wherein a drain pan for receiving drainage is disposed at a lower portion of the heat exchanger, and a lower end of the water guide member is in contact with the drain pan. In the drainage structure of the corrugated fin heat exchanger according to any one of claims 1 to 4,
A drainage structure for a corrugated fin heat exchanger, wherein the water guiding member is a wire. In the drainage structure of the corrugated fin heat exchanger according to any one of claims 1 to 4,
A drainage structure for a corrugated fin-type heat exchanger, wherein the water guide member has a shape in which a plurality of linear materials are formed, and a water channel is formed in a gap between the linear materials.

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