JP2003247795A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger which prevents drop and spatter of drain by smoothening treatment of the drain generated at the time of exchanging heat of heat-exchanging air, and improves heat exchange efficiency by reducing draft resistance. <P>SOLUTION: This heat exchanger comprises: a plurality of fins 1; collar parts 2 adjacently installed in a direction perpendicular to a heat-exchanging air distributing direction; heat exchanging pipes 4 fitted into the collar parts; and cutout parts 3 arranged between the fin collar parts. As to the cutout parts, at least a line La drawn from a center point Oa of the heat exchanging pipe downwards at 30 degrees on both sides is crossed with outer peripheries of the collar parts, and a ratio L1/DC of a shortest distance L1 between an upright end a of the cutout parts and the outer periphery of the collar and a diameter DC of the outer periphery of the collar part is set to satisfy the following relationship: L1/DC≥0.25. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used in, for example, an air conditioner, and more particularly to a cut-and-raised piece portion which is raised and processed into fins constituting the heat exchanger.

[0002]

2. Description of the Related Art For example, a heat exchanger is provided as a component of a refrigeration cycle in an air conditioner in addition to a compressor, valves and the like. When the air conditioner is composed of an indoor unit and an outdoor unit, a heat exchanger is required for each unit. These heat exchangers are arranged side by side with a predetermined gap, and a plurality of fins that circulate heat exchange air along the gap and a plurality of fins are provided so as to penetrate the fins, and the refrigerant is conducted therein. A so-called fin tube type, which is composed of a heat exchange pipe, is often used.

In order to improve the heat exchange efficiency of the heat exchanger, it is a recent tendency to provide the fins with cut and raised portions. Since the fins are extremely thin,
For example, while stamping the fins by pressing,
The cut-and-raised portion is processed at the same time. The cut-and-raised portion is provided between the heat exchange pipes adjacent to each other in the direction orthogonal to the flow direction of the heat exchange air. Further, a collar portion through which the heat exchange pipe is inserted is provided on one side of the fin so as to protrude in the same direction as the protruding direction of the cut and raised portion.

[0004]

As described above, in the indoor heat exchanger for the air conditioner, the fins are provided with a large number of cut and raised portions to improve the heat exchange efficiency. And various ideas have been made for the cut and raised portion. For example, as in the heat exchanger described in Japanese Patent Application Laid-Open No. 11-304388, the temperature boundary layer is thinned by dividing the fins by increasing the number of cut and raised portions or by offsetting the cut and raised portions alternately in different directions. It is considered important to increase the ratio of the area of the cut and raised portion.

However, in a heat exchanger having a large number of cut-and-raised parts, when drain water is generated and adheres to the fin surface, it is likely to accumulate in the cut-and-raised parts, which increases ventilation resistance and improves heat exchange efficiency. descend. Further, drain water may be carried and scattered in the flow of heat exchange air, and may be dripped into the room. In particular, there is a secular change over long-term use, and the hydrophilic coating on the fin surface deteriorates.

Further, when volatile organic compounds (called VOC gas) such as formaldehyde and toluene contained in synthetic resin materials and preservatives / adhesives for building materials are present in the indoor air, they adhere to the fin surface and become finned. The surface becomes water repellent. The generation of VOC gas tends to further increase due to diversification of housing building materials and improvement of airtightness of houses. When the fin surface becomes water repellent, drainage of drain water is not performed smoothly, and problems such as lower heat exchange efficiency and splash of drain water are promoted. Such a problem remarkably occurs when the fin pitch is set to 1.5 mm or less in order to improve the heat exchange performance.

The present invention has been made in view of the above circumstances, and an object of the present invention is to facilitate treatment of drain water generated when heat is exchanged with heat exchange air.
An object of the present invention is to provide a heat exchanger that can prevent the drain water from dripping and scattering, reduce ventilation resistance, and improve heat exchange efficiency.

[0008]

The heat exchanger of the present invention has been made in order to satisfy the above-mentioned object, and is arranged in parallel with a predetermined gap, and heat exchange air is circulated along these gaps. A plurality of fins to be made, a collar portion adjacent to each other in a direction orthogonal to the flow direction of the heat exchange air in each fin, a heat exchange pipe fitted into these collar portions and conducting a heat exchange medium inside, A cut-and-raised piece provided between the fin collar portions, wherein the cut-and-raised piece intersects with the outer peripheral surface of the collar portion at least 30 degrees downward from both sides of the center of the heat exchange pipe. Then, it is made to exist between the lines further lowered vertically downward from this intersection, and the shortest distance L1 between the rising end rising from the fin of the cut and raised piece and the outer peripheral surface of the collar and the diameter Dc of the outer periphery of the collar. Ratio L / Dc is, L1 / Dc ≧ 0.25
Is set.

The heat exchanger of the present invention has been made in order to satisfy the above-mentioned object, and includes a plurality of fins which are arranged in parallel with a predetermined gap and which allow heat exchange air to flow along these gaps. Between the fin collar portions, the collar portions adjacent to each other in the direction orthogonal to the flow direction of the heat exchange air in each fin, the heat exchange pipes fitted in these collar portions to conduct the heat exchange medium inside, and the fin collar portions. And a cut-and-raised piece on the center line connecting the center points of the collar and the heat exchange pipe, and a cut-and-raised piece on the center line. Of the cut-and-raised pieces provided between the side portion and the side edge of the fin, and the cut-and-raised piece portion is located on the center line from the cut-and-raised piece portion closest to the fin-side edge. As the cut-and-raised pieces become adjacent, between the cut-and-raised pieces in adjacent rows There is provided so that gradually becomes wider. Further, the cut-and-raised piece portion closest to the fin-side edge is provided between the fin-side edge and a line vertically downward from a point closest to the fin-side edge on the outer peripheral surface of the collar portion.

The heat exchanger of the present invention has been made in order to satisfy the above-mentioned object, and includes a plurality of fins which are arranged in parallel with a predetermined gap and which allow heat exchange air to flow along these gaps. Between the fin collar portions, the collar portions adjacent to each other in the direction orthogonal to the flow direction of the heat exchange air in each fin, the heat exchange pipes fitted in these collar portions to conduct the heat exchange medium inside, and the fin collar portions. And a cut-and-raised piece on the center line connecting the center points of the collar and the heat exchange pipe, and a cut-and-raised piece on the center line. Section and the side edges of the fins, the rising edges of the cutting and raising pieces of each row are overlapped when the fin side edges are directly viewed from the center line. It is provided so as not to become.

The heat exchanger of the present invention has been made in order to satisfy the above-mentioned object, and includes a plurality of fins which are arranged in parallel with a predetermined gap and which allow heat exchange air to flow along these gaps. Between the fin collar portions, the collar portions adjacent to each other in the direction orthogonal to the flow direction of the heat exchange air in each fin, the heat exchange pipes fitted in these collar portions to conduct the heat exchange medium inside, and the fin collar portions. And a cut-and-raised piece on the center line connecting the center points of the collar and the heat exchange pipe, and a cut-and-raised piece on the center line. Section and the side edges of the fins, and a plurality of rows of cut-and-raised pieces, and the cut-and-raised pieces located on the center line become the cut-and-raised pieces closest to the fin side edge. According to the The distance between the is provided so as to gradually narrow.

Further, at least at the cut-and-raised piece portion closest to the side edge of the fin, the rising end thereof is cut and raised obliquely. Further, the rising end that is cut and raised obliquely is inclined toward the rising end of the cut and raised piece on the center line. Further, the rising edge that is cut and raised obliquely has the maximum inclination angle set to 35 degrees or less. Furthermore, the rising end of the cut-and-raised piece on the center line is provided parallel to the flow direction of the heat exchange air. Further, the surface of the fin is subjected to hydrophilic treatment.

The heat exchanger of the present invention has been made in order to satisfy the above-mentioned object, and includes a plurality of fins which are arranged in parallel with a predetermined gap and which allow heat exchange air to flow along these gaps. Between the fin collar portions, the collar portions adjacent to each other in the direction orthogonal to the flow direction of the heat exchange air in each fin, the heat exchange pipes fitted in these collar portions to conduct the heat exchange medium inside, and the fin collar portions. The cut-and-raised piece portion is provided, and the cut-and-raised piece portion intersects at least 30 degrees downward from both sides of the center point of the heat exchange pipe with the outer peripheral surface of the collar portion and extends vertically downward from this intersection. The ratio L1 / Dc of the shortest distance L1 between the rising end rising from the fin of the cut and raised piece and the outer peripheral surface of the collar and the diameter Dc of the outer periphery of the collar is It is set so that L1 / Dc ≧ 0.25, and the cut-and-raised piece is a cut-and-raised piece on the center line connecting the center points of the collar section and the heat exchange pipe, and a cut-and-raised piece on the center line. It consists of multiple rows of cut-and-raised pieces provided between the one-side portion and the side edge of the fin, and the cut-and-raised piece portion closest to the fin-side edge becomes the cut-and-raised piece portion on the center line. Therefore, the intervals between the cut-and-raised pieces of the adjacent rows are gradually increased, and the rising edges of the cut-and-raised pieces of the respective rows are not overlapped with each other when the fin side edge is directly viewed from the center line. The distance between the center of the heat exchange pipe and the rising end of the cut-and-raised piece gradually narrows from the cut-and-raised piece provided on the center line to the cut-and-raised piece that is closest to the fin side edge. Is provided.

By adopting the means for solving such a problem, the drain water generated during the heat exchange with the heat exchange air can be smoothly treated, and the drain water is prevented from being dropped or scattered. Ventilation resistance can be reduced and heat exchange efficiency can be improved.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged perspective view of a part of a heat exchanger used in an indoor unit of an air conditioner, that is, an indoor heat exchanger. Here, it is shown as an image diagram, and details are schematically shown. The indoor heat exchangers are arranged side by side with a predetermined gap, and a plurality of fins 1 for circulating heat exchange air along these gaps.
And a heat exchange pipe (not shown) that penetrates through the fins 1 and that allows the refrigerant to pass therethrough.

Two rows of collar portions 2 are provided at predetermined intervals along the longitudinal direction of the fin 1 and in the lateral direction of the fin. The protrusion amount of these collar portions 2 is the fin 1
Almost the same as the mutual gap amount. The collar portions 2 in each row are provided in zigzag positions and face each other in the longitudinal direction. A heat exchange pipe, which will be described later, is inserted into each of the collar portions 2. A plurality of rows of cut-and-raised pieces 3 are provided between the collar portions 2 in the longitudinal direction of the fin 1. Since FIG. 1 is an image diagram, the cut-and-raised piece 3 has a form different from an actual one described later.

FIG. 2 is a sectional view schematically showing a part of the heat exchanger. A pair of fins 1 and 1 are arranged adjacent to each other along the flow direction of the heat exchange air to form a heat exchanger. The heat exchange pipes 4 are inserted into each fin 1 in a row in the longitudinal direction of the fin 1, which is a direction orthogonal to the flow direction of the heat exchange air, and at predetermined intervals.

The heat exchange pipes 4 are fitted in the collar portions 2 provided on the fins 1 described above, so that the heat exchange pipes 4 in each row are arranged in a staggered manner with respect to each other in the longitudinal direction. Facing each other. The heat exchange air is blown from one side of the heat exchanger as shown by the arrow in the figure, flows between the fins 1 and flows out from the other side end. The heat exchange air exchanges heat with the fins 1 while flowing through the fins 1, and collides with the heat exchange pipes 4 of the fins 1 to exchange heat.

Since the heat exchange pipes 4 are interleaved in the fins 1 in the left and right rows, the heat exchange air collides with all the heat exchange pipes 4, and an extremely effective heat exchange action is performed. The plurality of rows of cut-and-raised piece portions 3 are provided between the collar portion 2 and the heat exchange pipe 4 that are adjacent to each other in the fin 1 in the direction orthogonal to the circulation direction of the heat exchange air. The cut-and-raised piece portions 3 in each row have upper and lower portions forming rising ends, and the cut-and-raised portions having a protruding amount smaller than the protruding amount of the collar portion 2 in parallel with the surface of the fin 1 are formed between them.

Therefore, when heat exchange air is circulated between the fins 1 in the assembled state as a heat exchanger, the heat exchange air flows along the surfaces of the fins 1 and along the cut and raised pieces 3, A very effective heat exchange effect is obtained. FIG. 3 is an enlarged view of a part of the heat exchanger shown in FIG.
It has setting conditions described later.

That is, the lines La, La inclined by 30 ° to the left and right sides from the center point Oa of the collar portion 2 and the heat exchange pipe 4 are lowered downward in the figure, and the points where these lines and the outer peripheral surface of the collar portion 2 intersect. Find Ob. Further, the line Lb is lowered vertically downward from this intersection Ob. The line Lb that goes down vertically
Exist on both the upstream side and the downstream side of the circulating heat exchange air, and are drawn in parallel in pairs. At least, the cut-and-raised piece portion 3 must be present in a range sandwiched between the pair of lines Lb, Lb lowered in the vertically downward direction.

When the shortest distance between the rising end a of the cut-and-raised piece 3 and the outer peripheral surface of the collar portion 2 provided in the upper portion is L1 and the diameter of the collar portion 2 is Dc, L1 and Dc are given. The ratio of L1 / Dc ≧ 0.
The feature is that it is set to 25. When the heat exchanger is arranged in the indoor unit of the air conditioner and acts as an evaporator during the refrigeration cycle operation, water vapor in the air is condensed on the fin 1 surface due to heat exchange with the heat exchange air. Then, drain water is generated.

At this time, the drain water on the surface of the fin 1 and the collar portion 2 provided on the fin 1 flows from the upper part to the lower part. If the gap between the collar portion 2 and the rising end a of the cut-and-raised piece portion 3 provided below the collar portion 2 is narrow, drain water collects between them and becomes ventilation resistance,
Easy to scatter and drip. Therefore, the above L1 / Dc ≧
By setting it to be 0.25, a sufficient gap exists between the fin collar portion 2 and the rising end a of the cut and raised piece portion 3. Therefore, the generated drain water flows down without being accumulated, the ventilation resistance is increased, the drain water is prevented from scattering and dropping, and the heat exchange efficiency is improved.

FIG. 4 is an enlarged sectional view showing a part of the heat exchanger for further explaining the set conditions. When the heat exchange air flows along the center line Lc that connects the center points Oa of the collar portion 2 and the heat exchange pipe 4 that are adjacent to each other in the direction orthogonal to the flow direction of the heat exchange air, the air flow velocity becomes the highest. Therefore, the drain water accumulated along the center line Lc is most affected.

The distance from the reference line Ld set at an appropriate position between the upper and lower heat exchange pipes 4 and parallel to the flow direction of the heat exchange air to the outer peripheral surface of the collar portion 2 is L2, and the reference line Ld is set. There is almost no difference between L2 and L3, where L3 is the distance from the center point Oa of the heat exchange pipe 4 to the left and right sides of the line La to the point Ob where the line La crosses the outer peripheral surface of the collar portion 2.

That is, since the heat exchange pipe 4 is usually a circular pipe, the length of the flow width of the heat exchange air flowing between the heat exchange pipes 4 is 60 ° below the heat exchange pipe 4. Almost unchanged When this is mathematically expressed, L3 = L2 + 0.067 × Dc (a) and (a) are satisfied.

FIG. 5 shows a state in which drain water generated in the heat exchanger collects in the heat exchange pipe 4 and the fin collar portion 2 when the air conditioner is in a cooling operation, for example. The drain water concentrates and accumulates on the lower side of the heat exchange pipe 4 and the collar portion 2 and becomes enlarged. Depending on the size of the drain water that has accumulated, it may be about 6 from the center of the heat exchange pipe 4.
It is within the range of 0 °.

FIG. 6 shows necessary conditions in the lower part of the heat exchange pipe 4 and the collar portion 2 in order to obtain the setting conditions for the fin 1, the collar portion 2 and the cut-and-raised piece portion 3 from the above phenomenon in the heat exchanger. The width of the flat part is experimentally investigated. On the horizontal axis, the outer peripheral surface of the collar 2 and the cut-and-raised piece 3
The minimum gap L1 with the rising edge a of the and the ratio (L1 / Dc) to the diameter Dc of the collar portion 2 are taken, and the vertical axis shows the case where the drain water is attached to the fin 1 and the case where the drain water is not attached. The ratio of ventilation resistance to that when the surface of the fin 1 is dry is taken.

The fin pitch FP, which is the distance between the fins 1 and the fins 1, is 1.1 mm and 1.3 m.
Data were obtained by preparing three types of heat exchangers of m and 1.5 mm. In any fin pitch FP, the ratio L1 / Dc of the minimum gap L1 between the outer peripheral surface of the collar portion 2 and the rising edge a to the diameter Dc of the collar portion 2 is 0.2.
It was found that when the ratio was 5 or more, the increase rate of ventilation resistance due to the influence of drain water decreased. Therefore, the above setting condition L1 / Dc ≧ 0.25 is obtained.

The influence of drain water adhesion differs depending on the fin pitch FP. The smaller the fin pitch FP, the greater the influence of drain water adhesion, and the greater the effect of the present invention. Therefore, even if the fin pitch is set to 1.5 mm or less, the influence of drain water adhesion can be reduced, and the fin pitch can be 1.
It can be set to 5 mm or less, for example, 1.1 to 1.3 mm.

FIG. 7 is a sectional view of a part of the heat exchanger in which the shape of the cut-and-raised piece portion 3A processed into the fin 1 is different from that described above. Center point O of collar 2 and heat exchange pipe 4
A line La inclined by 30 ° to the left and right sides from a is lowered downward in the figure, and a point Ob at which the line La intersects with the outer peripheral surface of the collar portion 2 is drawn.
Ask for.

Further, the line Lb is lowered vertically from this intersection Ob. The line Lb that descends vertically downward is present on both the upstream side and the downstream side of the circulating heat exchange air, and is drawn in parallel in pairs. Here, these lines L drawn vertically downward
The cut and raised piece 3A is present on the line b. The shortest distance between the rising end a formed at the upper end of the cut and raised piece 3A and the outer peripheral surface of the upper collar 2 is L1.

Naturally, the heat exchange pipe 4 and the fin collar portion 2
Drain water (not shown) collects in the lower part of the. Since a sufficient gap is formed between the cut-and-raised piece rising edge a on the line Lb drawn vertically downward and the outer peripheral surface of the collar portion 2, drain water does not collect. FIG. 8 is a sectional view of a part of the heat exchanger for explaining other setting conditions. A cut-and-raised piece 3a is provided on a center line Lc connecting the center points Oa of the heat-exchange pipe 4 and the collar portion 2 adjacent to each other in the direction orthogonal to the flow direction of the heat-exchange air. A plurality of rows of cut-and-raised pieces 3b and 3c are provided between the bent piece 3a and both side edges b of the fin 1.

In this case, as the cut-and-raised piece 3a located on the center line Lc becomes from the cut-and-raised piece 3c closest to the fin-side edge b to the middle-row cut-and-raised piece 3b. The intervals between the cut-and-raised pieces 3a, 3b, 3c in the adjacent rows are set to gradually increase. That is, the interval between the cut-and-raised piece 3c closest to the side edge b of the fin 1 and the cut-and-raised piece 3b in the middle row is L4, and the cut-and-raised piece 3b in the middle row and the central axis Lc If the distance between the cut and raised piece 3a is L5,
L4 <L5.

Thus, the distance between the cut and raised pieces 3c is set to the center line Lc connecting the center points Oa of the heat exchange pipes 4 to each other.
By setting the width to be wider toward the side, the heat exchange efficiency by the cut-and-raised piece 3 can be improved, a passage under the drain water flow can be secured, and ventilation resistance can be reduced.

FIG. 9 is a partial cross-sectional view of a heat exchanger for explaining different setting conditions. The cut and raised piece 3 along the center line Lc connecting the center points Oa of the heat exchange pipes 4 adjacent to each other in the direction orthogonal to the flow direction of the heat exchange air.
a is provided, and a plurality of rows of cut-and-raised pieces 3b, 3c are provided between the cut-and-raised piece 3a and the side edge b of the fin 1.
Is provided.

The cut-and-raised piece 3c closest to the fin-side edge b is the fin-side edge b on the outer peripheral surface of the collar 2.
A line Ld vertically downward from the point Oc closest to
Between the fin side edge b (range indicated by hatching H in the figure)
Exists in. Therefore, while it is difficult for the drain water generated on the fin collar portion 2 to flow into the hatching range H, the drain water can be smoothly guided to the lower side of the fin 1 and the drain water is prevented from being dropped or scattered.

FIG. 10 is a partial cross-sectional view of a heat exchanger for explaining further different setting conditions. The cut-and-raised piece 3a is provided along the center line Lc connecting the center points Oa of the heat exchange pipe 4 and the collar portion 2 adjacent to each other in the direction orthogonal to the flow direction of the heat exchange air. It is premised that a plurality of rows of cut-and-raised pieces 3b and 3c are provided between the cut-and-raised piece 3a and the side edge b of the fin 1.

As shown only on the left side of the drawing, the rising end a1 of the cut-and-raised piece 3a provided on the center line Lc rises in parallel with the flow direction of the heat exchange air, while in the middle row. The rising edges a2, a3 of the cut-and-raised piece 3b and the cut-and-raised piece 3c closest to the fin-side end edge b are raised obliquely. Then, the center line Lc of the fin 1
With the fin side edge b directly viewed from above, the rising edges a1, a2, a3 of the cut-and-raised pieces 3a, 3b, 3c in each row are configured not to overlap.

That is, in the heat transfer performance of the heat exchanger,
The cut-and-raised piece 3 plays a large role, but in particular, the rising ends a formed at both ends of the cut-and-raised piece 3 have an excellent heat transfer promoting function. The rising ends a1, a2, and a3 are configured so as not to overlap in the flow direction of the heat exchange air so as to maintain the heat transfer promotion efficiency at the highest level. From this, all the cut-and-raised piece parts 3 have relatively high rising edges a.
Heat exchange air that has not advanced heat exchange can be applied,
The evaporation performance of the heat exchanger can be improved. Even when the heat exchanger is used as the condenser, the same effects can be obtained.

FIG. 11 is an enlarged cross-sectional view of a part of the heat exchanger for explaining different setting conditions. A center line Lc connecting the center points Oa of the collar portion 2 and the heat exchange pipe 4 adjacent to each other in the direction orthogonal to the circulation direction of the heat exchange air.
Assuming that the cut-and-raised piece 3a is provided on the upper side and a plurality of rows of cut-and-raised pieces 3b and 3c are provided between the cut-and-raised piece 3a and the side edge b of the fin 1. There is.

As the rising edges a1, a2, a3 of the cut-and-raised pieces 3a, 3b, 3c in each row are closer to the fin side edge b from the center line Lc, the heat exchange air from the heat exchange pipe center point Oa is exchanged. The distance between the rising edge a1, a2, a3 and the line Le drawn along the circulation direction of is gradually reduced. In addition, the cut-and-raised piece portions 3a that are adjacent to each other in the direction of the fin-side edge b from the center line Lc,
The distances between the rising ends a1, a2, and a3 of the 3b and 3c in the direction orthogonal to the heat exchange air circulation direction are gradually reduced.

In the figure, L6 is a cut-and-raised piece 3 closest to the side end edge b of the fin 1 from the center point Oa of the heat exchange pipe 4.
c is the distance from the rising end a3 to the lower end of the slope, L7 is the distance from the center point Oa of the heat exchange pipe to the middle row, and the piece 3b is the distance from the rising end a2 to the upper end of the slope, and L8 is the middle row to raise and cut the piece 3b Distance from the rising edge a2 of
L9 is the distance from the center point Oa of the heat exchange pipe 4 to the rising end a1 of the cut and raised piece 3a on the center line Lc.

Here, L6 <L7 and L8 <L9 are set, and further, L7-L6 <L9-L8 is set. Usually, the downstream side of the heat exchange air circulation of the heat exchange pipe 4 is a water stop region, and the air flow of the heat exchange air tends to stagnant, so it is not so useful in terms of heat transfer. In order to reduce the water cutoff area, for example, cut-and-raised parts are provided along the periphery of the heat exchange pipe so that the airflow can flow around the downstream side of the heat exchange pipe. However, due to the increased ventilation resistance, it is not possible to cope with the increased air volume as in the air conditioners of recent years.

On the other hand, with the configuration as shown in FIG. 11, the cut and raised pieces 3a, 3 provided around the heat exchange pipe 4 and around the heat exchange pipe 4 for the air flow of the heat exchange air.
It can be efficiently guided around the rising edges a1, a2, a3 of b, 3c. Ventilation resistance can be reduced, and a heat exchanger having a high heat transfer promotion effect can be provided. That is, since L6 <L7 and L8 <L9, the rising edges a1, a2, a of the cut and raised piece portions 3a, 3b, 3c are set.
A gap is formed in the order of 3, so that the airflow can easily flow around the rising edge without being separated. Rising edge a1, a
The heat transfer enhancement of 2, a3 can be kept very high, and there is sufficient air flow on both sides of this.

By setting L7-L6 <L9-L8, it is possible to prevent the heat exchange air flow from being excessively guided to the downstream side of the heat exchange pipe 4, thus preventing an increase in ventilation resistance and improving the wind speed distribution. Be useful for FIG. 12 is an enlarged cross-sectional view of a part of the heat exchanger for further explaining the above setting conditions.

The center point O between the collar portion 2 and the heat exchange pipe 4 which are adjacent to each other in the direction orthogonal to the flow direction of the heat exchange air.
From the cut-and-raised piece 3a on the center line Lc connecting a, the cut-and-raised piece 3c becomes closer to the fin-side end edge b through the cut-and-raised piece 3b in the middle row. Parts 3a, 3b, 3
Increase the angles of the rising edges a1, a2, a3 of c (A
<B) It is set so that the airflow can be easily guided to the downstream side of the heat exchange pipe 4. Then, in order to suppress an increase in ventilation resistance, the angle (B in the figure) of the rising end a3 in the cut-and-raised piece 3c closest to the fin-side edge b is set to 35 ° or less.

In order to improve the wind speed distribution and suppress the ventilation resistance, it is desirable that the rising end a1 of the cut-and-raised piece 3a on the center line Lc be parallel to the flow direction of the heat exchange air. The cut-and-raised piece portion 3 provided on the fin 1 described above is provided symmetrically with respect to the center line Lc connecting the collar portion 2 and the center points Oa of the heat exchange pipes 4 symmetrically. However, the present invention is not limited to this, and includes asymmetrically configured ones. Further, the fin 1 has its surface subjected to a hydrophilic treatment.
This makes it possible to withstand long-term use, be less susceptible to so-called VOC gas, and more reliably prevent drain water from accumulating.

[0049]

As described above, the heat exchanger of the present invention facilitates the treatment of drain water generated during heat exchange with heat exchange air and prevents the drain water from dripping and scattering. In addition, the ventilation resistance is reduced, and the heat exchange efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an image of a part of a heat exchanger, showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a part of the heat exchanger showing the same embodiment.

FIG. 3 is a cross-sectional view of a part of the heat exchanger for explaining setting conditions, showing the same embodiment.

FIG. 4 is a cross-sectional view of a part of the heat exchanger for explaining the setting conditions, showing the embodiment.

FIG. 5 is a cross-sectional view of a part of the heat exchanger for explaining a drain water generation state according to the embodiment.

FIG. 6 is a characteristic diagram illustrating the setting conditions of FIG. 4 showing the same embodiment.

FIG. 7 is a cross-sectional view of a part of the heat exchanger illustrating different setting conditions according to the embodiment.

FIG. 8 is a cross-sectional view of a part of the heat exchanger for explaining different setting conditions, showing the embodiment.

FIG. 9 is a cross-sectional view of a part of the heat exchanger for explaining different setting conditions, showing the same embodiment.

FIG. 10 is a cross-sectional view of a part of the heat exchanger for explaining different setting conditions, showing the embodiment.

FIG. 11 is a cross-sectional view of a part of the heat exchanger for explaining different setting conditions, showing the embodiment.

FIG. 12 is a characteristic diagram illustrating a different setting condition according to the embodiment.

[Explanation of symbols]

1 ... fin 2 ... Color part, 4 ... heat exchange pipe, 3, 3a, 3b, 3c ... Cut and raised piece, a, a1, a2, a3 ... rising edge.

Claims (11)

[Claims] 1. A plurality of fins, which are arranged in parallel with a predetermined gap, and through which heat exchange air flows along these gaps,
Collars adjacent to each other in a direction orthogonal to the flow direction of heat exchange air in each fin, heat exchange pipes fitted into these collars and conducting a heat exchange medium inside, and the fin collars described above. The cut-and-raised piece portion is provided in the cross-shaped piece, and the cut-and-raised piece portion intersects at least a line that is lowered 30 degrees downward from both sides of the center point of the heat exchange pipe with the outer peripheral surface of the collar portion. Between the lines which are further lowered vertically downward from the above, and the shortest distance L1 between the rising end rising from the fin of this cut and raised piece and the outer peripheral surface of the collar, and the diameter Dc of the outer periphery of the collar. A heat exchanger characterized in that the ratio L1 / Dc is set such that L1 / Dc ≧ 0.25. 2. A plurality of fins, which are arranged in parallel with a predetermined gap and through which heat exchange air flows along the gap,
Collars adjacent to each other in a direction orthogonal to the flow direction of heat exchange air in each fin, heat exchange pipes fitted into these collars and conducting a heat exchange medium inside, and the fin collars described above. And a cut-and-raised piece portion on the center line connecting the center points of the collar portion and the heat exchange pipe, and a cut-and-raised piece portion on the center line. And a plurality of rows of cut-and-raised pieces provided between the fin and the side edge of the fin, wherein the cut-and-raised piece is the cut-and-raised piece closest to the fin-side edge. A heat exchanger, characterized in that the intervals between the cut-and-raised pieces in adjacent rows are gradually increased as the cut-and-raised pieces on the center line are formed. 3. The cut-and-raised piece closest to the fin-side edge is located between a line vertically downward from a point closest to the fin-side edge on the outer peripheral surface of the collar and the fin-side edge. The heat exchanger according to claim 2, wherein the heat exchanger is provided in the. 4. A plurality of fins, which are arranged in parallel with a predetermined gap, and through which heat exchange air flows along these gaps,
Collars adjacent to each other in a direction orthogonal to the flow direction of heat exchange air in each fin, heat exchange pipes fitted into these collars and conducting a heat exchange medium inside, and the fin collars described above. And a cut-and-raised piece portion on the center line connecting the center points of the collar portion and the heat exchange pipe, and a cut-and-raised piece portion on the center line. Consisting of a plurality of rows of cut-and-raised pieces provided between the side edge of the fin and the side edge of the fin, and the cut-and-raised piece portion of each row in a state where the fin-side edge is directly viewed from the centerline. A heat exchanger characterized in that the rising edges of the heat exchangers are provided so as not to overlap with each other. 5. A plurality of fins, which are arranged in parallel with a predetermined gap, and through which heat exchange air flows along these gaps,
Collars adjacent to each other in a direction orthogonal to the flow direction of heat exchange air in each fin, heat exchange pipes fitted into these collars and conducting a heat exchange medium inside, and the fin collars described above. And a cut-and-raised piece portion on the center line connecting the center points of the collar portion and the heat exchange pipe, and a cut-and-raised piece portion on the center line. A plurality of rows of cut-and-raised pieces provided between the fin and the side edge of the fin, and the cut-and-raised piece closest to the fin-side edge from the cut-and-raised piece provided on the center line. A heat exchanger characterized in that the distance between the center of the heat exchange pipe and the rising end of the cut-and-raised piece gradually becomes narrower as it becomes one piece. 6. The raised edge of at least the cut-and-raised piece portion closest to the side edge of the fin is diagonally cut-and-raised. Heat exchanger. 7. The heat according to claim 4, wherein the obliquely rising edge is oblique to the rising edge of the cut and raised piece on the center line. Exchanger. 8. The heat exchanger according to claim 6, wherein the rising end that is cut and raised obliquely has a maximum inclination angle of 35 degrees or less. 9. The heat exchange according to claim 4, wherein a rising end of the cut-and-raised piece on the center line is provided in parallel with a flow direction of heat exchange air. vessel. 10. The fin according to claim 1, wherein the surface of the fin is subjected to a hydrophilic treatment.
The heat exchanger according to any one of 1. 11. A plurality of fins, which are arranged in parallel with a predetermined gap and through which heat exchange air flows along these gaps, and a direction orthogonal to the flow direction of the heat exchange air in each fin. The cut-and-raised part is provided with adjacent collar portions, heat-exchange pipes fitted into these collar portions and conducting a heat-exchange medium inside, and cut-and-raised pieces provided between the fin collar portions. The strip portion at least intersects the line lowered 30 degrees on both sides from the center point of the heat exchange pipe with the outer peripheral surface of the collar portion, and is present between the lines dropped vertically downward from this intersection point, and The ratio L1 / Dc of the shortest distance L1 between the rising end rising from the fin of the cut and raised piece and the outer peripheral surface of the collar and the diameter Dc of the outer periphery of the collar is L1 / Dc ≧ 0.25. Set to The cut-and-raised piece portion is a cut-and-raised piece portion on a center line connecting the center points of the collar portion and the heat exchange pipe, a cut-and-raised piece portion on the center line, and a side edge of the fin. A plurality of rows of cut-and-raised pieces provided between the cut-and-raised pieces that are closest to the fin-side end edge and are cut-and-raised pieces on the center line. Therefore, the intervals between the cut-and-raised pieces of the adjacent rows are gradually widened, and the rising ends of the cut-and-raised pieces of each row are overlapped with each other in a state where the fin side edge is directly viewed from the center line. The heat exchange pipe center and the rising end of the cut-and-raised piece are arranged in such a manner that the cut-and-raised piece provided on the center line becomes the cut-and-raised piece that is closest to the fin-side end edge. Heat exchange characterized in that the distance between vessel.