JP4287581B2 - Heat exchanger for air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a heat exchanger for an air conditioner in which a heat exchanger is inclined and accommodated.
[0002]
[Prior art]
Among heat exchangers for air conditioners, in particular, indoor heat exchangers have improved heat exchange efficiency by providing a large number of cuts on the fins. Moreover, various devices have been made for the cutting and raising method.
[0003]
For example, in Patent Registration No. 2628570, the temperature boundary layer is made thinner or the ratio of the cut-up area by dividing the fins by increasing the number of cut-ups or by offsetting both sides that are cut in different directions alternately. The technology which increases is described.
[0004]
In addition, in Japanese Utility Model Publication No. 5-39330, there is described an example in which a drain water guide concave groove or a cut-and-raised piece is used in the vicinity of the fin end as a means for preventing the water droplets from splashing. Yes.
[0005]
[Problems to be solved by the invention]
However, in the heat exchanger having a large number of cuts and protrusions as described above, there is a possibility that the hydrophilic film formed on the fin surface is deteriorated when used for a long time. Alternatively, VOC (volatile organic compound) gas or the like that may be released from new housing building materials adheres to the fin surface and becomes water repellent. In this state, the drainage of the drain water is not performed smoothly, and there is a problem that the drain water drops or scatters outside the heat exchanger and is eventually discharged to the outside of the air conditioner.
[0006]
In particular, the water repellency of the fin surface due to adhesion of VOC gas or the like tends to increase due to diversification of housing construction materials and improvement of airtightness of the housing. As a recent energy-saving measure for air conditioners, the heat exchanger capacity is increased by inclining the heat exchanger in the air conditioner housing. On the other hand, the drain water is easily scattered. ing.
[0007]
The present invention has been made paying attention to the above circumstances, and its object is a heat exchanger disposed in an inclined manner in an air conditioner, and constitutes a heat exchanger with a heat exchange action. An object of the present invention is to provide a highly reliable heat exchanger for an air conditioner in which drain water generated and adhered to fins is smoothly discharged.
[0008]
[Means for Solving the Problems]
In order to satisfy the above-described object, the present invention is provided with a plurality of fins arranged in a state having an inclination angle in a state of being incorporated in an air conditioner, and arranged in parallel with a narrow gap therebetween. In a heat exchanger for a finned tube type air conditioner comprising a heat exchanging pipe penetrating the collar part and provided with a plurality of cuts and raised between the collar parts of the fins,
The heat exchange pipes are arranged in a row in the fins and penetrated with a predetermined step pitch,
Between the heat exchange pipe rows on the air upstream side and the air downstream side of the fins, there is provided an inter-row cut with a length of 3/4 or more of the step pitch of the heat exchange pipe on the air upstream side,
Than the intersection of the line that goes down 45 degrees in the anti-inclined direction from the vertical line passing through the center of the heat exchange pipe on the upstream side of the air, the line that goes down vertically from the intersection with the outside of the collar, and the cut between the rows The end of the inter-row cut-up is on the upper side, and the distance between the intersection and the end of the inter-row cut- up is set within 1/5 of the step pitch .
[0018]
By adopting means for solving such a problem, drain water generated and adhered to the fins is smoothly drained along with the heat exchange action, and a highly reliable heat exchanger for an air conditioner is obtained.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an indoor unit of an air conditioner in cross section.
Suction ports 2 and 3 for sucking and guiding indoor air into the unit main body are respectively provided on the front surface and the upper surface of the unit main body 1 which is a housing. At the lower part of the front surface of the unit main body 1, there is provided a blowout port 4 for blowing out and guiding the air heat-exchanged in the unit main body into the room again.
[0020]
Inside the unit main body 1, an indoor heat exchanger 5 formed in a substantially inverted V shape in a side view is disposed. The indoor heat exchanger 5 includes a front heat exchanger portion 5A that is curved from the lower end of the front suction port 2 to a substantially intermediate portion of the upper suction port 3, and the unit main body 1 from the upper end of the front heat exchanger portion. And a rear heat exchanger section 5B inclined obliquely downward on the back side.
[0021]
In any of the front and rear heat exchanger sections 5A and 5B, a part or all of the front and rear heat exchanger sections 5A and 5B are arranged obliquely with respect to the horizontal plane. This indoor heat exchanger 5 is a so-called fin tube in which a large number of fins 6 are arranged with a narrow gap, a plurality of heat exchange pipes 7 or one heat exchange pipe meander, and the fins are penetrated. It is a heat exchanger in the form.
[0022]
Drain receivers 8a and 8b are provided facing the lower ends of the front and rear heat exchanger sections 5A and 5B, respectively. Moreover, the crossflow fan 9 which comprises an indoor air blower is arrange | positioned between these heat exchanger parts 5A and 5B. A casing 10 is provided to form a blower passage from the periphery of the cross flow fan 9 to the blowout port 4, and smoothly guides air that has passed through the indoor heat exchanger to the blowout port 4. Yes.
[0023]
FIG. 2A is an enlarged view of a part of the indoor heat exchanger 5. However, the heat exchange pipe 7 is omitted here, and only the fins 6 are shown. In the center of the width direction, which is the direction in which the heat exchange air (indoor air) of the fins 6 circulates, an inter-row cut 11 is provided with a predetermined interval in the longitudinal direction. By the inter-row cuts 11, the fins 6 are partitioned on the left and right sides with respect to the width direction.
[0024]
FIG. 2B shows the collar portion 12 provided on the fin 6. Cylindrical collar portions 12 project from the respective portions partitioned left and right by the inter-row cuts 11 in a row along the longitudinal direction and at a predetermined pitch.
[0025]
The color portions 12 in the left and right rows are designed so that their positions are not opposed to each other, and are arranged in a so-called staggered pattern. The heat exchange pipe 7 is inserted into the collar portion 12 almost in a press-fitted state, and the position in the fin 6 is determined.
[0026]
A cut and raised portion 13 is provided between the collar portions 12 of each row. These cut-and-raised parts 13 are so-called slit pieces that form elongated holes and are integrally cut on one side as in the case of the inter-row cut-and-raised parts 11.
[0027]
A plurality of cut and raised portions 13 made of such slit pieces are juxtaposed in parallel with each other at a predetermined interval in the width direction of the fin to form a cut and raised group. The cut-and-raised direction of all the cut-and-raised parts 13 is the same surface side, and the length of the cut-and-raised parts 13 on both sides is formed longer than the length of the inner cut-and-raised part.
[0028]
In FIG. 3, a part of fin 6 which comprises the heat exchanger 5 of 1st Embodiment is shown.
[0029]
The heat exchanger 5 is arranged to have a predetermined inclination angle θ with respect to the horizontal plane. The heat exchange air (room air) guided into the unit body 1 and passing through the heat exchanger 5 flows in one direction (width direction) entering from the left side of the fin 6 and exiting from the right side. .
[0030]
Here, on the downstream side in the heat exchange air flow direction, the minimum distance b between the cut and raised 13 and the end edge of the fin 6 is equal to the outside of the collar portion 12 through which the heat exchange pipe 7 passes on the same air downstream side and the fin. It is characterized in that it is formed to be smaller than the minimum distance a from the six end edges.
[0031]
In addition, the distance b between the narrowly raised cut 13 and the end edge of the fin 6 is set to be larger than 1/10 of the width direction dimension Wf that is the flow direction of the heat exchange air of the fin 6. .
[0032]
FIG. 4 shows the fin 6 in a modification of the first embodiment.
The minimum distance b between the cut and raised 13 on the downstream side of the air and the end edge of the fin 6 is formed larger than the minimum distance a between the outer side of the collar portion 12 on the downstream side of the air and the end edge of the fin 6. The minimum distance a between the outside of the side collar portion 12 and the end edge of the fin 6 is set to be larger than 1/10 of the width direction dimension Wf of the fin.
[0033]
That is, when the heat exchanger 5 acts as an evaporator, the water vapor in the air is condensed on the fin surface by the heat exchange between the fins 6 and the heat exchange air, and becomes drain water. When the finned-tube heat exchanger 5 is inclined, drain water collects at the end of the fin 6 that is vertically below due to the influence of gravity and flows along the fin edge.
[0034]
If a smooth surface of a certain width exists at the end of the fin 6, the drain water flows without difficulty, but if there is even a narrow part, the drain water overflows from the fin and drops and scatters. There is a fear.
[0035]
In particular, a fin that has become water-repellent due to deterioration due to changes over time or adhesion of chemical substances is more likely to scatter. The amount of drain water is proportional to the fin 6 area, in other words, proportional to the fin width. For this reason, a flat portion having a width corresponding to the fin width is required for smooth drainage.
[0036]
FIG. 5 is an experimental investigation of the required flat portion width in the fin 6 and is relative to the flat portion minimum gap near the end of the fin 6 which is the lower side when the heat exchanger 5 is inclined on the horizontal axis. The ratio of the fin width is taken, and the vertical axis shows the amount of drain water scattered outside the heat exchanger 5.
[0037]
As shown in the figure, it can be seen that when the ratio of the minimum gap to the fin width exceeds 10%, the amount of drained water greatly decreases. Therefore, the configuration as described above with reference to FIGS. 3 and 4 is introduced, drainage of the drain water adhering to the fin 6 is smoothly drained, and dripping and scattering to the outside of the indoor unit are prevented, thereby improving the reliability. obtain.
[0038]
As a second embodiment, a fin 6A configured as shown in FIG. 6 may be used.
When the finned-tube heat exchanger 5 is disposed with an inclination angle θ with respect to the horizontal plane, the distance b between the cut and raised 13 on the most downstream side of the air and the end edge of the fin 6A on the downstream side of the air is It is set equal to or smaller than the distance a between the downstream collar portion 12 and the end edge of the fin 6A on the air downstream side.
[0039]
That is, the drain water generated on the fins 6A gathers at the fin end portion on the vertical lower side and further flows along the fin end edge. It is influenced by the position of
[0040]
When the values of the distance a and the distance b are set to be the same, the amount of drain water that is raised and passed through the collar portion 12 is higher than the amount that drain water passes through the vicinity of the collar portion 12. Become.
[0041]
This is because the minimum gap with the edge of the fin 6A in the vicinity of the collar portion 12 is only one point, and conversely, in the case of the cut and raised 13, the range corresponding to the length of the cut and raised is the minimum gap. is there. Therefore, it is more effective to set the distance b between the cut and raised 13 and the fin end edge to be greater than the distance a between the collar portion 12 and the fin 6A edge. Even so, a certain degree of effect can be obtained.
[0042]
As a third embodiment, a fin 6B configured as shown in FIG. 7 may be used.
[0043]
When the finned-tube heat exchanger 5 is arranged with a predetermined inclination angle θ with respect to the horizontal plane, the distance between the most downstream side air cut 13 and the end edge of the air downstream side fin 6B is stepwise. It is configured to expand as it goes to the lower level.
[0044]
That is, the amount of drain water flowing on the fins 6B increases as it goes down, so that the drain water can be prevented from scattering by increasing the distance between the fins and the lower edges as shown in FIG. The same effects as described in the above can be obtained.
[0045]
Alternatively, as a modified example, as shown in FIG. 8A, all the numbers of the raised portions 13 in the respective stages of the collar portions 12 through which the heat exchange pipe 7 penetrates are all made the same, and with respect to the collar portion central axis. You may provide so that there may be no position shift.
[0046]
Then, the lower edge of the fin 6B is set to be inclined with respect to the central axis of the collar portion 12 and the cut and raised portion 13. This inclination increases the distance between the cut and raised 13 and the end edge of the fin 6B from the upper side to the lower side.
[0047]
As a further modification, as shown in FIG. 8B, the lower end edge of the fin 6B is the same as the upper end edge in any part, and the number of the raised parts 13 extends from the upper part to the lower part. It may be gradually reduced or the interval between the slits may be narrowed. In either case, the same effects as those described with reference to FIG. 7 can be obtained.
[0048]
As a fourth embodiment, a fin 6C configured as shown in FIGS. 9A and 9B may be used.
That is, after combining the configurations of the first to third embodiments described above, a groove portion 15 having a concave cross section is provided along the edge on the inclined lower side of the fin 6C.
[0049]
The drain water flows along the groove 15 having a concave cross section provided at the end of the fin 6C, so that the drain water film flowing along the fin end becomes thin, and the scattering of water droplets outside the heat exchanger is reduced.
[0050]
As the fifth embodiment, a fin 6 </ b> D configured as shown in FIG. 10 may be used.
The cut and raised portions 13A and 13B form a plurality of strips and cut and raised groups provided in parallel with a predetermined interval in the width direction of the fin 6D, and the heat exchange air downstream in a portion where the inclination angle of the fin is small The cut and raised group 13A on the side is configured differently from the other cut and raised groups 13B.
[0051]
Specifically, in the fin 6D that is inclined, the cut and raised groups 13A on the downstream side through which the heat exchange air flows are provided in parallel with three lines, and the other cut and raised groups 13B are provided with four lines in parallel. ing.
[0052]
As described above, by setting the cut-and-raised group 13A having a shape with good drainage drainage only in a portion where the inclination angle is small, it is possible to minimize a decrease in heat transfer performance. In particular, it is clear from FIG. 5 that the drainage performance is good when the inclination angle of the fin end adjacent to the cut-and-raised group 13A having a different configuration is 60 ° or less.
[0053]
As a sixth embodiment, a fin 6E configured as shown in FIGS. 11A, 11B, and 11C may be used.
In the fins 6E constituting the heat exchanger 5, between the upstream and downstream heat exchange pipes 7 through which the heat exchange air circulates, an inter-row cut 11A having a length of 3/4 or more of the pipe stage pitch is formed. Is provided.
[0054]
In a state where the heat exchanger 5 is inclined, a line that is lowered 45 ° downward from the vertical line passing through the center of the heat exchange pipe 7 on the upstream side of the air through the center of the heat exchange pipe 7 in the anti-tilt direction of the heat exchanger 5 When, a line drawn from the intersection of the collar portion 12 vertically downward, the column than the intersection p magi raised 11 a, there end of the row and chopped raised 11A is upward, and the intersection p columns and chopped electromotive In this case, the distance f from the end portion 11A is set within 1/5 of the step pitch h.
[0055]
That is, in order to prevent the drain water from splashing out of the heat exchanger 5, it is necessary to minimize the amount of drain water flowing through the end of the fin 6E located below (on the air downstream side). According to the above-described configuration, the drain water generated on the upstream side of the air is cut between the rows and flows downward along the line 11 </ b> A, so that the amount flowing to the end portion side of the fin 6 </ b> E can be reduced. Does not flow.
[0056]
If it demonstrates, as shown by the arrow in FIG. 12, the drain water produced | generated by the fin 6E will cut and raise, will be gathered around the collar part 12 through the edge part of 13 groups, and will flow along this circumference. Then, the drain water wraps around to the lower side of the collar portion 12 due to inertial force, and leaves the collar portion within a range of ± 45 ° with respect to the vertical line.
[0057]
In the above-described configuration, since the inter- row cut 11A exists vertically below this range (± 45 ° with respect to the vertical line) , the drain water is delayed from being transmitted to the air downstream side. By making the position where the drain water reaches the edge of the downstream fin 6E as low as possible, even when the drain water is dripped, the probability that it will fit in the drain receptacles 8a, 8b increases, and damage is minimized. it can.
[0058]
Therefore, by adopting the configuration described with reference to FIG. 11A, the above-described effects can be obtained. Further, as shown in FIG. 11B, the higher the effect is obtained as the length between the columns 11B is increased. Alternatively, as shown in FIG. 11 (C), the same operation and effect can be obtained by cutting up between rows and setting up the shape of 11C as one side.
[0059]
As a seventh embodiment, a fin 6F configured as shown in FIG. 13 may be used.
In this case, the distance n between the collar portion 12b in the air downstream row and the fin downstream edge is larger than the distance m between the upstream collar portion 12a through which the heat exchange air flows and the air upstream edge of the fin 6F. It is characterized by a large setting.
[0060]
By adopting the above-described configuration, the distance n between the collar portion 12b in the downstream row and the fin downstream end edge can be increased without increasing the size in the width direction that is the heat exchange air flow direction of the fin 6F. Get drain water splash prevention without cost increase.
[0061]
As an eighth embodiment, a fin 6G configured as shown in FIG. 14 may be used.
In this fin 6G, the above-mentioned cut and raised 13 is a single-side cut and raised in the same plane direction (upper surface direction in the figure). A flat portion 20 that is not cut at all and is flush with the base surface is formed between the cut and raised portions 13 and 13 that are parallel to each other.
[0062]
That is, drain water can be cut up and flow through the flat portion 20 between the 13 so that the drain water can reach the end edge of the fin 6G. And by making the position where drain water reaches the fin 6G edge as low as possible, even when drain water is dripped, the probability that it will be contained in the drain receptacle increases, and damage can be minimized. .
[0063]
In the heat exchanger 5 of all the embodiments described above, the fin pitch between the fins 6 and 6 is set to 1.4 mm or less.
That is, in the case of a heat exchanger with a small fin pitch, the drain water droplets interposed between the fins are brought into a bridge state by making the surface of the fin 6 water repellent. Although the water droplets in the bridge state have a certain size as time passes, they are held at the same position until the balance between gravity and frictional force is lost.
[0064]
Therefore, on the assumption that a flat surface large enough to hold the amount of drain water flowing out is in the vicinity of the end of the fin and there is no bottleneck, the above values are determined and the amount of drain water scattered. Can be reliably reduced.
[0065]
【The invention's effect】
As described above, according to the present invention, it is assumed that the drain water attached to the fins is smoothly discharged on the assumption that the air conditioner is disposed in an inclined manner in the air conditioner, thereby improving drainage and improving reliability. There is an effect that can be achieved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an indoor unit of an air conditioner according to an embodiment of the present invention.
FIG. 2 is a perspective view in which a part of the heat exchanger according to the embodiment is omitted, and a cross-sectional view of a collar portion.
FIG. 3 is a partial configuration diagram of a heat exchanger according to the first embodiment of the present invention.
FIG. 4 is a partial configuration diagram of a heat exchanger according to a modification of the first embodiment.
FIG. 5 is a characteristic diagram of the amount of drain water falling on the fins of the heat exchanger according to the present invention.
FIG. 6 is a partial configuration diagram of a heat exchanger according to a second embodiment of the present invention.
FIG. 7 is a partial configuration diagram of a heat exchanger according to a third embodiment of the present invention.
FIG. 8 is a partial configuration diagram of a heat exchanger in different modifications of the third embodiment.
FIG. 9 is a partial configuration diagram and a cross-sectional view of a heat exchanger according to a fourth embodiment of the present invention.
FIG. 10 is a configuration diagram of a heat exchanger according to a fifth embodiment of the present invention.
FIG. 11 is a partial configuration diagram of a heat exchanger according to a sixth embodiment of the present invention, and a partial configuration diagram of a heat exchanger in a different modification.
FIG. 12 is a diagram illustrating the flow of drain water in the heat exchanger according to the present invention.
FIG. 13 is a partial configuration diagram of a heat exchanger according to a seventh embodiment of the present invention.
FIGS. 14A and 14B are a plan view and a sectional view of a heat exchanger cut and raised according to an eighth embodiment of the present invention. FIGS.
[Explanation of symbols]
6 ... Fins,
7 ... heat exchange pipe,
13 ...
12 ... Color part,
20 ... flat part,
15 ... groove,
11 ... Inter-row cut.

Claims (1)

It is arranged so as to have an inclination angle when incorporated in an air conditioner, and includes a plurality of fins arranged side by side with a narrow gap between each other, and a heat exchange pipe penetrating the collar portion provided in these fins. In the heat exchanger for a finned tube type air conditioner provided with a plurality of raised portions between the collar portions of the fins,
The heat exchange pipes are arranged in a row in the fins and penetrated with a predetermined step pitch,
Between the heat exchange pipe rows on the air upstream side and the air downstream side of the fins , there is provided an inter- row cut with a length of 3/4 or more of the step pitch of the heat exchange pipe on the air upstream side ,
Than the intersection of the line that goes down 45 degrees in the anti-inclined direction from the vertical line passing through the center of the heat exchange pipe on the upstream side of the air, the line that goes down vertically from the intersection with the outside of the collar, and the cut between the rows A heat exchanger for an air conditioner, characterized in that the end of the inter-row raised portion is above, and the distance between the intersection and the inter-row raised end is set within 1/5 of the step pitch. .

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