JPH06307784A - Mesh fin heat exchanger for air conditioner - Google Patents

Abstract

PURPOSE:To enlarge the degree of freedom of the installation angle by not easily generating the scattering of drain water of a mesh fin heat exchanger. CONSTITUTION:In a mesh fin the exchanger 1 wherein a plurality of mesh fins MF1 to MF7 are overlapped and laminated on the upper and lower both sides of heat transfer pipes 1a, 1b, a part of the mesh fin MF7 on the lowermost layer side is protruded to the lower side from the joining surface of the heat transfer pipes 1a, 1b, thereby a rib 21 is formed, while, reverse V-shaped recessed groove parts 22, 22 are joined to the lower surface parts of the heat transfer pipes 1a, 1b. Thereby condensed water concentrated near the lower surfaces of the heat transfer pipes 1a, 1b by the capillary phenomenon is bridged on the recessed groove parts 22, 22, thereby the holding power is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mesh fin heat exchanger for air conditioners using mesh fins.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger, a large number of flat plate-shaped fins are arranged with a narrow gap, and a plurality of heat transfer tubes are pierced so as to be orthogonal to these fins. However, various types of heat exchangers have been recently proposed in order to further improve heat transfer performance.

As one of them, for example, Shoukaisho 61-19
Japanese Patent No. 2185 describes a mesh fin type heat exchanger in which a plurality of copper heat transfer tubes are inserted and fixed in parallel between two sets of laminated fins in which two or more copper mesh fins are stacked. (See FIG. 9). According to such a heat exchanger, the fin having the mesh structure exhibits the same effect as that when the cut-and-raised width of the slit or the louver of the flat plate-shaped fin in the cross fin coil type heat exchanger is extremely narrowed. Therefore, it is expected to be put into practical use as a heat exchanger having high heat transfer performance.

[0004]

Problems to be solved when the wall fin type air conditioner as shown in FIG. 8 is constructed by using the mesh fin heat exchanger will be described below.

First, reference numeral 10 in the figure denotes a main body housing (main body casing) of the air conditioner.

An air inlet 3 is formed in an upper portion of the front side of the main body housing 10, and an air outlet 5 is formed in a lower portion thereof. Then, in the main body housing 10, the upstream side air suction port 3 to the downstream side air outlet 5 are provided.
Is formed in the air flow passage 7. In the air flow passage 7, a mesh fin heat exchanger 1 and a cross flow fan 2 are arranged in parallel in order from the upstream side to the downstream side. .

[0007] The mesh fin heat exchanger 1, as shown in FIG. 9, a small-diameter heat transfer tubes 1a, 1b and the heat transfer tubes 1a, a plurality polymerized on either side of the 1b mesh fin MF ₁ ~MF ₅
And is arranged behind the air suction port 3 with the upper portions bent in the horizontal direction as shown in the drawing. Further, the cross flow fan 2 is arranged behind the lower portion of the mesh fin heat exchanger 1 in correspondence with the installation shape of the air flow passage 7.

On the other hand, reference numeral 11 is a drain pan provided under the mesh fin heat exchanger 1,
It receives drain water from the mesh fin heat exchanger 1 during cooling operation or the like.

Since the opening / closing plate 6 is positioned in the state of the phantom line in the drawing during normal cooling and heating, when the crossflow fan 2 is driven, the air in the room is drawn in as shown by the solid line of the arrow. It is sucked in through the mouth 3 and supplied to the mesh fin heat exchanger 1 for efficient heat exchange (heating or cooling). Then, the heat-exchanged air is
The air is blown out through the cross flow fan 2 from the air outlet 5 into the room at a predetermined angle.

The mesh fin heat exchanger 1 has a large degree of freedom in shape as compared with the case of a cross fin coil, and by bending the upper portion as shown in the drawing, a large heat exchange area can be secured and a high heat transfer is achieved. Compactness (thinning) is possible in combination with performance.

On the other hand, in the case of the mesh fin heat exchanger, on the other hand, the condensed water during the cooling operation drops, as shown in the drawing, particularly in the horizontal surface portion due to the bending, and the condensed water is blown into the room by the blow of the cross flow fan 2. The problem occurs.

By comparing the scattering phenomenon of the condensed water with the case of the cross fin coil type heat exchanger and analyzing it in relation to the installation angle θ and the front wind speed, for example, the data as shown in FIG. 13 is obtained. Was given.

From these results, it can be seen that at least the mesh fin heat exchanger has a wider area where condensed water does not scatter than the cross fin coil heat exchanger, and has a large degree of freedom in usable shape.

Therefore, in order to effectively expand such a feature, the installation angle θ is further increased by θ =
It is necessary to expand the structure to around 90 ° (horizontal state) and to make the structure such that water droplets do not scatter.

The present invention has been made in order to solve such a problem, and the mesh for an air conditioner is designed to prevent the above-mentioned water droplet scattering phenomenon from occurring as much as possible even when installed horizontally. It is intended to provide a fin heat exchanger.

[0016]

The invention described in each of claims 1 to 4 of the present application is provided with the following problem solving means in order to solve the above-mentioned conventional problems.

(1) Structure of the Invention According to Claim 1 A mesh fin heat exchanger for an air conditioner according to the present invention comprises a heat transfer tube and a plurality of mesh fins superposed and laminated on both upper and lower sides of the heat transfer tube. The mesh fin heat exchanger for an air conditioner is characterized in that a rib is formed on the mesh fin of the lowermost layer and a groove is formed at a position below the heat transfer tube of the rib.

(2) Structure of the Invention According to Claim 2 A mesh fin heat exchanger for an air conditioner according to the present invention comprises a heat transfer tube and a plurality of mesh fins superposed and laminated on both upper and lower sides of the heat transfer tube. The mesh fin heat exchanger for an air conditioner is characterized in that a concave groove portion is formed at a lower surface position of the heat transfer tube.

(3) Configuration of the Invention According to Claim 3 The mesh fin heat exchanger for an air conditioner of the present invention comprises a heat transfer tube and a plurality of mesh fins superposed and laminated on both upper and lower sides of the heat transfer tube. The mesh fin heat exchanger for an air conditioner is characterized in that a bulging portion protruding downward is provided at a position below the heat transfer tube of the mesh fin of the lowermost layer.

(4) Structure of the Invention According to Claim 4 The mesh fin heat exchanger for an air conditioner of the present invention comprises a heat transfer tube and a plurality of mesh fins superposed and laminated on both upper and lower sides of the heat transfer tube. The mesh fin heat exchanger for an air conditioner is characterized in that a concave groove is formed on the entire outer peripheral surface of the heat transfer tube.

[0021]

The invention described in each of claims 1 to 4 of the present application has the following effects corresponding to each of the above configurations.

(1) Operation of the Invention According to Claim 1 In the mesh fin heat exchanger for an air conditioner of the present invention, as described above, a plurality of mesh fins are superposed and laminated on the upper and lower sides of the heat transfer tube. In the mesh fin heat exchanger, ribs are formed by projecting a part of the lowermost layer side mesh fins downward from the joint surface of the heat transfer tube, and at the same time, a groove is provided at the lower surface of the heat transfer tube. As a result, the retention of condensed water droplets concentrated near the lower surface of the heat transfer tube due to the capillary phenomenon is enhanced.

That is, in the external structure, the concave groove portion of the rib allows the water droplets to be held in the bridge state for a long time, and is eventually discharged to the drain side without being scattered by the wind. Therefore, the degree of water droplet scattering into the room is reduced.

(2) Operation of the invention according to claim 2 In the mesh fin heat exchanger for an air conditioner of the invention, as described above, a plurality of mesh fins are superposed and laminated on the upper and lower sides of the heat transfer tube. In the mesh fin heat exchanger, a concave groove is provided by denting the lower surface of the heat transfer tube to the upper side, and the heat transfer tube is formed by a capillary phenomenon by joining the lowermost mesh fin to the heat transfer tube at the concave groove. It is designed to enhance the retention of condensed water droplets concentrated near the lower surface of the.

That is, in the external structure, the concave groove portion on the lower surface of the heat transfer tube allows the water droplets to be held in the bridge state for a long time, and is eventually discharged to the drain side without being scattered by the wind. Therefore, the degree of water droplet scattering into the room is reduced.

(3) Operation of the invention according to claim 3 In the mesh fin heat exchanger for an air conditioner of the invention, as described above, a plurality of mesh fins are superposed and laminated on the upper and lower sides of the heat transfer tube. In the mesh fin heat exchanger, the condensate water droplets concentrated near the lower surface of the heat transfer tube due to the capillary phenomenon are provided by providing a mountain-shaped bulging portion that is located on the lower surface of the heat transfer tube of the lowermost side mesh fin and bulges downward. It is designed to increase the holding power of.

That is, in the outer structure, the water droplets can be reliably held for a long time by the capillary suction force of the bulging portion of the lowermost side mesh fin, and the drain side will eventually not be scattered by the wind. Is discharged to. Therefore, the degree of water droplet scattering into the room is greatly reduced.

(4) Operation of the invention according to claim 4 In the mesh fin heat exchanger for an air conditioner, as described above, a plurality of mesh fins are superposed and laminated on the upper and lower sides of the heat transfer tube. In the heat exchanger, a concave groove is formed on the entire outer peripheral surface of the heat transfer tube, and the water droplet holding force is further increased by both the water drop bridge effect and the capillary adsorption effect that covers the concave groove. .

Therefore, according to this structure, the degree of water droplet scattering is sufficiently reduced, while the heat transfer area of the small diameter heat transfer tube itself is expanded and the heat exchange performance is also improved.

[0030]

As a result of the above, according to the mesh fin heat exchanger for an air conditioner of the present invention, the degree of splash of drain water is reduced, and the installation angle of the mesh fin heat exchanger can be expanded.

[0031]

【Example】

(1) First Embodiment FIGS. 1 and 2 show the configuration of a mesh fin heat exchanger for an air conditioner according to a first embodiment of the present invention.

When a mesh fin heat exchanger having a conventional structure as shown in FIG. 9 is installed near a horizontal state, the state where condensed water is generated is analyzed and the situation as shown in FIGS. 10 and 11 is obtained. Turned out to be.

[0033] That is, the heat transfer tubes 1a, the mesh fin heat exchanger 1 formed by a plurality of mesh fins MF ₁ ~MF ₇ in the multilayer structure to 1b, the structural, polymerization of mesh fins MF ₁ ~MF ₇ The capillary phenomenon also acts on the portion, and the capillary phenomenon becomes particularly prominent in the vicinity of the joint with the heat transfer tubes 1a and 1b having a high degree of polymerization, and condensed water tends to concentrate on the portion. As a result, the concentrated condensed water becomes large water droplets, and the heat transfer tubes 1a, 1 having a small holding force (adsorption degree).
b Drops downward from the bottom surface and scatters by blowing air. This phenomenon is caused by changing the mesh fin heat exchanger 1 to the one shown in FIG.
It becomes more noticeable when installed in such a form.

Therefore, in the present embodiment, as shown in FIGS. 1 and 2, a mesh fin heat exchanger _{1 formed by} superposing a plurality of mesh fins MF _{1 to} MF ₇ on both upper and lower sides of the heat transfer tubes 1a and 1b. At the bottom layer side mesh fin MF ₇
Ribs 21 are formed by projecting a part of the ribs downward from the joint surface of the heat transfer tubes 1a, 1b, while
The inverted V-shaped recessed groove portions 22, 22 are formed on the lower surface portions of the heat transfer tubes 1a, 1b, and then joined to the lower surface portions of the heat transfer tubes 1a, 1b, so that the heat transfer tubes 1a, 1b are formed by the capillary phenomenon. It is characterized in that the holding power of condensed water droplets concentrated near the lower surface of the is increased.

That is, in the outer structure, the inverted V-shaped concave groove portions 22, 22 of the rib 21 allow the water droplets to be held in the bridge state for a long time as shown in the drawing, and be scattered by the wind. Instead, it is eventually discharged to the drain side. Therefore, the degree of water droplet scattering into the room is reduced.

(2) Second Embodiment FIGS. 3 and 4 show the structure of a mesh fin heat exchanger for an air conditioner according to a second embodiment of the present invention.

In this embodiment, as shown in FIGS. 3 and 4, a plurality of mesh fins MF _{1 to} MF ₇ are connected to the heat transfer tubes 1a,
In the mesh fin heat exchanger 1 formed by stacking layers on both the upper and lower sides of 1b, the lower surface of the heat transfer tubes 1a, 1b is recessed upward in an inverted V shape so that the lower mesh fin MF ₇ has a groove at the joint. In the same manner as in the first embodiment in which the heat transfer tubes 1a and 1b are provided, reverse V-shaped concave groove portions 23, 23 are provided in the lower surface portions of the heat transfer tubes 1a, 1b, and the heat transfer tube 1 is formed in the reverse V-shaped concave groove portions 23, 23.
By joining the lowermost mesh fin MF ₇ to a and 1b in a lid shape, the heat transfer tubes 1a and 1b are formed by the above capillary phenomenon.
It is characterized in that the holding power of condensed water droplets concentrated near the lower surface of the is increased.

That is, in the external structure, as in the first embodiment, the water drops are held in the bridge state for a long time as shown in FIG. 4 by the concave V-shaped concave grooves 23, 23 of the heat transfer tubes 1a, 1b. As a result, they are eventually discharged to the drain side without being scattered by the wind. Therefore, the degree of water droplet scattering into the room is reduced.

(3) Third Embodiment FIGS. 5 and 6 show the structure of a mesh fin heat exchanger for an air conditioner according to a third embodiment of the present invention.

In this embodiment, as shown in FIGS. 5 and 6, a plurality of mesh fins MF _{1 to} MF ₇ are connected to the heat transfer tubes 1a,
In a mesh fin heat exchanger 1 formed by polymerizing laminated on both upper and lower sides 1b, the heat transfer tubes 1a and the lower side mesh fin MF _7, while disposed slightly brought positioned above side of the joint surface 1b, the the said heat transfer tube By providing mountain-shaped bulging portions 24, 24 that bulge downward on the lower surface of 1a, 1b and joining both sides of the bulging portions 24, 24 to the heat transfer tubes 1a, 1b, the heat transfer tube 1a is produced by the above capillary phenomenon. , 1b is enhanced in the retention of condensed water droplets concentrated near the lower surface.

That is, in the outer structure, as shown in the drawing, the water droplets are reliably held by the capillary adsorption force of the bulging portions 24, 24 of the lowermost layer side mesh fin MF ₇ , and are scattered by the wind. It will eventually be discharged to the drain side. Therefore, the degree of water droplet scattering into the room is greatly reduced.

(4) Fourth Embodiment FIG. 7 shows the structure of the essential parts of a mesh fin heat exchanger for an air conditioner according to a fourth embodiment of the present invention.

In this embodiment, as shown in FIG. 7, in the mesh fin heat exchanger 1 in which a plurality of mesh fins MF _{1 to} MF ₇ are superposed and laminated on the upper and lower sides of the heat transfer tube 1a,
A large number of inverted V-shaped concave groove portions 25, 25 ... Which perform the same function as in the second embodiment are formed on the entire outer peripheral surface of the heat transfer tube 1a, and the inverted V-shaped concave groove portions 25, 25.・ The water drop holding power is further enhanced by both the water drop bridge effect and the capillary adsorption effect by the mesh that covers it.

Therefore, according to this structure, the degree of water droplet scattering is sufficiently reduced, while the heat transfer area of the small diameter heat transfer tube 1a itself is expanded, and the heat exchange performance is also improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a mesh fin heat exchanger for an air conditioner according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing the configuration and operation of the main part of the heat exchanger.

FIG. 3 is a sectional view showing a configuration of a mesh fin heat exchanger for an air conditioner according to a second embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view showing a configuration and an operation of a main part of the heat exchanger.

FIG. 5 is a sectional view showing a configuration of a mesh fin heat exchanger for an air conditioner according to a third embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view showing the configuration and operation of a main part of the heat exchanger.

FIG. 7 is a sectional view showing the structure of a mesh fin heat exchanger for an air conditioner according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a configuration of a conventional general air conditioner using a mesh fin heat exchanger.

FIG. 9 is a partially cutaway perspective view showing a configuration of a main part of a mesh fin heat exchanger of the air conditioner.

FIG. 10 is a cross-sectional view showing a problem when the heat exchanger is installed in a horizontal state.

FIG. 11 is an enlarged cross-sectional view of a main part in the state of FIG.

FIG. 12 is a side view showing a problem when the heat exchanger of FIG. 9 is installed in a manner different from that of FIGS. 10 and 11.

FIG. 13 is a graph showing the water droplet scattering regions of the mesh fin heat exchanger and the cross fin heat exchanger in the air conditioner of FIG. 8 in comparison.

[Explanation of symbols]

1 is a mesh fin heat exchanger, 1a and 1b are heat transfer tubes, 22 and
Reference numeral 23 is an inverted V-shaped concave groove portion, 24 is a mountain-shaped bulged portion, 25 is an inverted V-shaped concave groove portion, and MF _{1 to} MF ₈ are mesh fins.

Claims (4)

[Claims] 1. A mesh fin heat exchanger for an air conditioner, comprising a heat transfer tube and a plurality of mesh fins stacked and laminated on the upper and lower sides of the heat transfer tube, wherein ribs are formed on the lowermost mesh fin. A mesh fin heat exchanger for an air conditioner, characterized in that a concave groove is formed at a position below the heat transfer tube of the rib. 2. A mesh fin heat exchanger for an air conditioner, comprising a heat transfer tube and a plurality of mesh fins superposed on the upper and lower sides of the heat transfer tube, wherein a groove is formed at the lower surface of the heat transfer tube. A mesh fin heat exchanger for an air conditioner, which is characterized in that 3. A mesh fin heat exchanger for an air conditioner, comprising a heat transfer tube and a plurality of mesh fins laminated on the upper and lower sides of the heat transfer tube, wherein a lower position of the heat transfer tube of the lowermost mesh fin. A mesh fin heat exchanger for an air conditioner, which is provided with a bulging portion projecting downward. 4. A mesh fin heat exchanger for an air conditioner, comprising a heat transfer tube and a plurality of mesh fins stacked and laminated on the upper and lower sides of the heat transfer tube, wherein a groove is formed on the entire outer peripheral surface of the heat transfer tube. A mesh fin heat exchanger for an air conditioner characterized by the above.