JPH08166181A - Heat exchanger - Google Patents

Abstract

PURPOSE: To prevent staguation of dew water, to reduce draft resistance and thereby to improve the efficiency of heat exchange by providing fins with projecting parts coming into contact with flat tubes or adjacent fins and by disposing the fins in parallel to the flat tubes. CONSTITUTION: A plurality of flat tubes 1 directed in the vertical direction are disposed in a state of juxtaposition in the horizontal direction and a plurality of flat-plate-shaped fins 2 and fins 3 with projecting parts directed in the vertical direction are placed between the flat tubes 1 and in parallel thereto, while the projecting parts 4 formed in the shape of trapezoids and coming into contact with the flat tubes 1 or the adjacent fins 2 are provided on the respective surfaces and rears of the fins 3. Heat conduction between the flat tube 1 and the fin 3 with the projecting parts and between the fins 2 and 3 is made efficient by the projecting parts 4 of the fins 3 and thereby the efficiency of heat exchange by blown air is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a heat exchanger of a heat pump room air conditioner, for example, and more particularly to a parallel flow type heat exchanger or a serpentine type heat exchanger.

[0002]

2. Description of the Related Art As shown in FIGS. 8 and 9, a conventional heat exchanger includes a plurality of flat tubes 21 which are vertically oriented and arranged in parallel in a horizontal direction, and a vertical direction between the flat tubes 21. The corrugated fins 22 are arranged in a meandering direction, and the hollow header 23 connects both ends of each of the flat tubes 21.

A plurality of the flat tubes 21 are oriented in the vertical direction and are arranged in parallel in the horizontal direction.
The corrugated fins 22 which are in contact with the flat tube 21 and are thermally connected to each other are arranged in a meandering manner in the vertical direction.
In order to promote heat exchange, the corrugated fins 22 have the same louver 24 on the upstream side and the downstream side of the cooling air and have the same shape so that the inclination directions on the upstream side and the downstream side are opposite.
Was provided.

When air is blown to the heat exchanger as shown by an arrow B in FIG. 8, the air B flows between the corrugated fins 22 and flows through the gaps of the louvers 24 to perform heat exchange. The refrigerant is a large number of small holes 25 provided in the flat tube 21.
Flows while performing heat exchange. At this time, in general, when the heat exchanger is used as an evaporator, the arrow M in FIG.
The refrigerant flows in the direction of, and when used as a condenser, flows in the direction opposite to the arrow M, and the hollow header 23 forms an inlet / outlet of the refrigerant to the flat pipe 21.

Another example of the conventional heat exchanger will be described with reference to FIG. 10. A serpentine type heat exchanger in which corrugated fins 27 are arranged in a meandering manner vertically between flat tubes 26 arranged in a meandering manner in the horizontal direction. There was an exchange.

However, since neither of the above heat exchangers has been considered when used as an evaporator, the following problems have occurred when used as an evaporator. That is, in the evaporator, by sending the cooling air to the heat exchanger, the water in the cooling air is condensed on the fin surface.
This has been disadvantageous in that a large amount of water is retained between the fins to increase the ventilation resistance of the cooling air and reduce the heat exchange efficiency.

When used as an outdoor unit of an air conditioner (air conditioner) as an evaporator (during the heating operation of the heat pump), the air passing through the heat exchanger is cooled through the corrugated fins 27, and the air is changed. The retained water condenses on the surface of the corrugated fin 27, and when the temperature of the fin surface is below freezing, the condensed water freezes and the corrugated fin 2
There is a case where frost is formed on the surface of No. 7, and this frost grows with time and blocks the ventilation passage.

This is generally referred to as clogging due to frost formation. When the capacity is reduced due to frost formation, so-called defrosting is performed to melt the frost by reverse cycle operation or the like. As a result, a large amount of molten water accumulates between the fins, and when the heating operation is restarted, these accumulated water freezes and the heat exchanger performance cannot be exhibited, resulting in frost formation again in a short time. Therefore, there is a problem that it causes clogging.

In order to eliminate such inconvenience, FIG.
2, a plurality of flat tubes 28 are oriented in the vertical direction and are arranged in parallel in the horizontal direction.
Corrugated fins 29 that are in contact with the flat tubes 28 and are thermally connected therebetween are arranged in a meandering shape in the horizontal direction. The corrugated fins 29 have through holes 30 through which cooling air flows in order to promote heat exchange.

[0010]

In the heat exchanger shown in FIG. 11, there is no resistance on the wall surface of the corrugated fin against the flow of the condensed water condensed on the surface of the fin, and the condensed water remains. However, since the through holes in the wall surface of the fins serve as air flow passages, there is a problem that ventilation resistance becomes very large and heat exchange efficiency deteriorates.

The heat exchanger of the present invention has been made in view of the above problems, and the fin is provided with a flat tube or a protrusion that abuts an adjacent fin, and the fin is arranged in parallel with the flat tube. The purpose is to prevent the dew condensation water from staying and reduce the ventilation resistance to improve the heat exchange efficiency.

[0012]

In order to achieve the above object, the heat exchanger according to claim 1 is such that a plurality of flat tubes are oriented in the vertical direction and are arranged in parallel in the horizontal direction. A plurality of flat plate-shaped fins are vertically arranged in parallel between the flat tubes, and the fins are provided with protrusions that come into contact with the flat tubes or the adjacent fins. They are arranged in parallel.

The heat exchanger according to a second aspect of the present invention is provided with a louver for circulating the air blown to the fins.

Further, in the heat exchanger according to the third aspect of the present invention, the fins with the projections provided with the projections and the flat fins are alternately arranged between the flat tubes.

[0015]

In the heat exchanger according to the first aspect, the condensed water condensed on the surface of the fin flows down the surface of the fin, and the blown air flows between the fins, and the fin is discharged from the flat pipe. The transferred heat is radiated to the air flowing between the fins for heat exchange. At this time, since the protrusion provided on the fin is in contact with the flat tube or the adjacent fin, heat is transferred through the protrusion to improve heat exchange efficiency.

According to the heat exchanger of claim 2,
Since air flows through the louvers of the fins, heat exchange efficiency is further improved.

In the heat exchanger according to the third aspect, heat is exchanged without increasing the ventilation resistance of the air flowing between the fins.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the heat exchanger of the present invention will be described with reference to FIGS.

In the heat exchanger of the present invention, a plurality of flat tubes 1 are oriented in the vertical direction and arranged in parallel in the horizontal direction,
A plurality of flat plate-shaped fins 2 and fins 3 with protrusions are vertically oriented between the flat tubes 1 and arranged in parallel with the flat tubes 1. The fin 3 is a trapezoidal projection 4 that comes into contact with the flat tube 1 or the adjacent fin 2.
Are provided on the front and back.

Then, for example, the fins 3 with protrusions are arranged next to the flat tube 1 on the left side, the fins 2 are arranged in parallel next to the fins 3 with protrusions, and thereafter the fins 3 with protrusions are arranged.
And fins 2 are alternately arranged, and the fins 3 with protrusions are arranged in front of the flat tube 1 on the right side. In this way, by alternately arranging the fins 3 with protrusions and the fins 2 in the shape of a flat plate, the number of protrusions 4 located between the fins 3 with a protrusion and the fins 2 in the plate shape is reduced, It is arranged that the flat tube 1, the projection fins 3 and the flat plate-shaped fins 2 can satisfactorily conduct heat with a small ventilation resistance.

When the heat exchanger having the above structure is used as an evaporator, the ventilation air flows between the fins 3 with protrusions and the flat fins 2 as shown by an arrow A in FIG. To do. At this time, since the fins 3 with protrusions and the fins 2 having a flat plate shape are alternately arranged, the number of the protrusions 4 of the fins 3 with protrusions is suppressed to a necessary minimum, and the ventilation resistance between the fins is reduced. Is minimized and heat exchange is efficiently performed by blowing air, and heat is conducted between the flat tube 1 and the fins 3 with protrusions and between the fins 2 and 3 by the protrusions 4 efficiently and is blown. Improves heat exchange efficiency by air.

Then, the dew condensation water that has condensed on the surfaces of the fins 3 with projections and the fins 2 in the form of a flat plate flows down the surfaces of the fins 3 with the projections, the fins 2 in a flat plate shape, and the flat tube 1. However, since the flat tube 1 and the fins 2 and 3 are arranged in the vertical direction, the condensed water flows down smoothly and hardly accumulates, and the frost on the flat tube 1 and the fins 2 and 3 is almost zero. In addition, clogging due to frost formation can be prevented as much as possible, and heat exchange efficiency can be improved.

Next, a second embodiment of the heat exchanger of the present invention will be described with reference to FIG.

In the heat exchanger of the present invention, a plurality of flat tubes are arranged vertically and are arranged in parallel in a horizontal direction, and the plurality of flat fins 5 and the fins with protrusions are arranged between the flat tubes. 6 is oriented vertically and is arranged parallel to the flat tube.

The fins 6 are provided with projections 7 on the front and back surfaces that come into contact with the flat tubes or the adjacent fins 5, and louvers 8 through which air blown flows are provided between the projections 7. A louver 9 through which air to be blown flows is also provided on the flat fins 5.

The louvers 8 of the fins 6 with protrusions and the louvers 9 of the plate-shaped fins 5 are provided on the upstream and downstream sides of the air blown to promote heat exchange, and on the upstream and downstream sides of the ventilation. And are formed in the same shape so that the inclination directions are reversed.

When the heat exchanger having the above structure is used as an evaporator, when the ventilation air flows between the fins 3 with protrusions and the flat fins 2, the ventilation air passes through the louvers 8 and 9 to generate ventilation air. The contact state with each fin 5, 6 is improved, and the heat exchange efficiency is improved. The dew condensation water that has condensed on the surfaces of the fins 6 with projections and the flat plate-like fins 5 flows down the surface of the fins 6 with projections, the flat plate-like fins 5, and the flat tubes, Since the fins 5 and 6 are arranged in the vertical direction, the dew condensation water flows down smoothly and hardly accumulates, and there is almost no frost on the flat tubes and the fins 5 and 6 and the eyes due to frost formation. Clogging can be prevented as much as possible, and heat exchange efficiency can be improved.

In the first and second embodiments described above, the fins are provided with trapezoidal projections, but they may be formed in a truncated cone shape as shown in FIGS. . 5 and 6 show the fin 10 as in the first embodiment.
The protrusions 11 are provided on the fins, and FIG. 7 shows the fins 12 provided with the protrusions 13 and the louvers 14 as in the second embodiment.

The heat exchanger having the above structure can be used as either a parallel flow type or a serpentine type heat exchanger.

[0030]

Since the heat exchanger according to the first aspect of the present invention is configured as described above, the condensed water that has condensed on the surface of the fin smoothly flows down the surface of the fin, and the condensed water does not stay on the surface of the fin. Since frost formation can be prevented as much as possible, clogging due to frost formation can be prevented. Moreover, since the flat tubes or the adjacent fins are in contact with each other by the projections, heat can be efficiently conducted between the flat tubes and the fins and between the fins, and the heat exchange efficiency by the blown air can be improved. You can

Further, since the heat exchanger according to claim 2 has the above-mentioned constitution, in addition to the above effects, the heat exchange between the air blown by the louver and the fins is performed without impairing the flow of the dew condensation water. Since the heat exchanger according to claim 3 is configured as described above, in addition to the above effects, the protrusions located between the fins can be suppressed to a minimum required amount to reduce ventilation resistance. Since it can be made small, it does not reduce the heat exchange efficiency by blowing air,
The heat transfer efficiency between the flat tube and the fins and between the fins can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts of a first embodiment of a heat exchanger of the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is an exploded perspective view showing the flat plate-shaped fins and the fins with protrusions of FIG. 1.

FIG. 4 is an exploded perspective view showing a flat plate-shaped fin and a fin with a protrusion according to a second embodiment of the heat exchanger of the present invention.

FIG. 5 is a vertical cross-sectional view showing an example similar to the first embodiment in which a truncated cone-shaped protrusion is provided in the heat exchanger of the present invention.

FIG. 6 is an exploded perspective view showing the flat plate-shaped fins and the fins with protrusions of FIG.

FIG. 7 is an exploded perspective view showing a plate-shaped fin and a fin with a projection, which is similar to the second embodiment in which the truncated cone-shaped projection is provided in the heat exchanger of the present invention.

FIG. 8 is a perspective view showing an example of a conventional heat exchanger.

9 is a partially enlarged perspective view of FIG.

FIG. 10 is a perspective view showing another example of a conventional heat exchanger.

FIG. 11 is a partial perspective view showing another example of the conventional heat exchanger.

[Explanation of symbols]

 1 Flat tube 2 Flat fin 3 Fin with protrusion 4 Protrusion

Claims (3)

[Claims] 1. A plurality of flat tubes are oriented vertically,
A heat exchanger in which a plurality of flat plate-shaped fins are arranged in parallel in the horizontal direction and in parallel with each other between the flat tubes, wherein the flat tubes or the adjacent fins are arranged on the fins. A heat exchanger characterized in that a projection portion that comes into contact with is provided, and the fins are arranged parallel to the flat tube. 2. The heat exchanger according to claim 1, further comprising a louver through which air blown to the fins flows. 3. The heat exchanger according to claim 1, wherein fins with protrusions provided with the protrusions and fins having a flat plate shape are alternately arranged between the flat tubes. .