JP2002350078A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger that can obtain the high heat transferring performance corresponding to its size even when the exchanger has a plurality of rows of heat exchanger tubes and can perform effective heat exchange. SOLUTION: This heat exchanger is constituted by combining a plurality of units 1A and 1B each of which is provided with a plurality of rectangular plate-like fins 2, 2, etc., which are arranged in parallel with each other in a facing state at prescribed intervals in the thickness direction of the fins 2 so that air may flow through the spaces between the fins 2 in the direction almost parallel to the shorter sides of the fins 2 and a plurality of heat exchanger tubes 3, 3, etc., which are passed through the fins 2 in a direction nearly perpendicular to the surfaces of the fins 2 and arranged in a row in the direction nearly parallel to the longer sides of the fins 2. The plate-like fin group of each unit is separated from the plate-like fin group of the adjacent unit at a prescribed interval or longer in the flowing direction of the air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for an air conditioner.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view showing an example of a conventional heat exchanger for an air conditioner. This heat exchanger is formed by combining two units 101A and 101B in the flow direction of the air flow. The units are arranged substantially parallel to each other at predetermined intervals in the plate thickness direction and have a short plate surface. A plurality of rectangular plate-like fins 102, 102, ... that allow air flow to flow in a direction substantially parallel to the sides, penetrate these in a direction substantially orthogonal to the plate surface, and are substantially parallel to the long sides of the plate surface Heat transfer tubes 103, 1 arranged in rows in various directions
03,...

The heat transfer tubes 10 of the units 101A and 101B
One end of each of 3, 103,... Penetrates the support plate 104 in a direction substantially orthogonal to the plate surface, and is mutually connected by the support plate 104. Heat transfer tubes 103, 103,...
Is curved near the other end of each unit to form an L-shape. The units 101A and 101B are arranged such that the plate-like fins 102, 102,...

[0004]

Since the above-described heat exchanger has two heat transfer tube rows, the heat transfer area is doubled as compared with the case where the heat transfer tube row is one row, and the heat exchange capacity is increased. However, it is not possible to obtain twice the heat transfer capacity as compared with a single heat transfer tube array. As a measure of the air-side heat exchange performance, the air-side heat transfer coefficient obtained by the heat exchange amount / {(heat transfer area) × (temperature difference between fin and air)} is known. In comparison, the heat transfer coefficient on the air side in the case of two rows of heat transfer tubes is reduced by about 7% to 10% in the case of one row, and sufficient heat transfer capacity is obtained as compared with the size of the heat exchanger. It turns out that there is no.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a first invention is directed to a method in which a plurality of plates are arranged substantially parallel to each other at predetermined intervals in a plate thickness direction. A plurality of plate-shaped fins for passing an air flow in a direction substantially parallel to the surface, and penetrating these plate-shaped fins in a direction substantially perpendicular to the plate surface and being substantially parallel to the plate surface and substantially orthogonal to the air flow A plurality of units each including a plurality of heat transfer tubes arranged so as to form a row in the direction of flow of the air flow, wherein the plate-like fin group of each unit is It is characterized in that it is separated from the plate-like fin group of the adjacent unit by a predetermined distance or more in the flow direction of the air flow.

According to a second aspect of the present invention, there is provided the heat exchanger according to the first aspect, wherein a center of the heat transfer tube of one unit and a group of plate-like fins of the unit adjacent to the unit on the downstream side of the air flow. Is characterized in that the distance L from the upstream side edge to the diameter D of the heat transfer tube is L ≧ 1.5D.

In a third aspect of the present invention, the heat exchanger according to the first aspect of the present invention has two rows of heat transfer tubes, which are connected to each other and the heat transfer tubes are provided at one or a plurality of places in each row. It is characterized by being curved.

According to a fourth aspect of the present invention, in the heat exchanger according to the third aspect, the heat transfer tubes are curved in the vicinity of the other end in each row to form an L-shape.

According to a fifth aspect of the present invention, the heat exchanger of the first aspect has two rows of heat transfer tubes, which are connected and one of the heat transfer tube rows is curved near the other end. And is L-shaped.

According to a sixth aspect of the present invention, in the heat exchanger of the first to fifth aspects, two rows of heat transfer tubes adjacent to each other are arranged in a staggered manner so as not to overlap in the flow direction of the air flow. It is characterized by being.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a first embodiment of the present invention, FIG. 2 is a partial longitudinal sectional view of FIG. 1, and FIG. 3 is a graph showing the effect of the present invention.

As shown in FIG. 1, the heat exchanger of the present embodiment is composed of two units 1A and 1B combined in the direction of air flow, and each unit has a predetermined interval in the plate thickness direction. A plurality of rectangular plate-like fins 2, 2, ..., which are arranged substantially parallel to each other and allow air flow to flow in a direction substantially parallel to the short side of the plate surface, and these are substantially orthogonal to the plate surface. And a plurality of heat transfer tubes 3, 3,... Arranged in a row in a direction substantially parallel to the long side of the plate surface.
・ ・

The heat transfer tubes 3, 3,... Of the units 1A, 1B
Have one end penetrating the support plate 4 in a direction substantially perpendicular to the plate surface, and are connected to each other by the support plate 4. Also,
The heat transfer tubes 3, 3,... Of each unit are curved near the other end to form an L-shape. Then, the units 1A, 1
B are combined so that the plate-like fins 2, 2,... Of one unit are separated from the plate-like fins 2, 2,. ing.

More specifically, as shown in FIG. 2, the distance L between the center of the heat transfer tube 3 of the upstream unit 1A and the upstream edge 2a of the plate fin 2 of the downstream unit 1B is transmitted. L ≧ 1.5D with respect to the tube diameter D of the heat tube. As shown in FIG. 3, when L = 2D or more, the air side heat transfer coefficient becomes 100% or more, and when L = 1.5D, about 98%, L
= D is about 92%.

As shown in FIG. 2, the upstream heat exchanger 1A
The dead flow region R (the region with low heat exchange efficiency) of the dead flow region reaches about twice the diameter D of the pipe, and the smaller the distance L, the more the dead flow region overlaps the plate-like fin 2 of the downstream heat exchanger 1B. As the ratio increases, the heat exchange performance decreases. L ≧
Almost satisfactory performance can be obtained at 1.5D. In this way, the plate-like fins 2, 2,.
Are plate fins 2, 2,... Of the unit 1B on the downstream side.
..Efficient heat exchange can be performed without deteriorating heat transfer performance even if it has a plurality of heat transfer tube rows because it is separated from the air flow direction by a predetermined distance or more in the flow direction. it can.

In this embodiment, two units 1
Are arranged in a zigzag manner so as not to overlap in the flow direction of the air flow. In this way, the air flow flowing between the plate-like fins 2 of the unit 1A or 1B is reduced and expanded by the heat transfer tubes 3, 3,... Of the unit 1A or 1B. ,.. Are arranged in a grid pattern, the ventilation resistance is large, but the air-side heat transfer coefficient is also large.

Next, a second embodiment of the present invention will be described. FIG. 4 is a plan view of the second embodiment. In addition,
In the following embodiments, portions corresponding to those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

In this embodiment, the heat transfer tubes 3, 3,... Of the units 1A, 1B
It is shaped like a letter. By doing so, the occupied space inside the outdoor unit is reduced, so that the outdoor unit can be made compact. Other configurations and operational effects are the same as those of the first embodiment.

Next, a third embodiment of the present invention will be described. FIG. 5 is a plan view of the third embodiment.

In this embodiment, the other end of the unit 1A on the upstream side is connected to the heat transfer tube 3 by the other end of the unit 1B.
.., Projecting in the length direction, and the projecting portion is curved by approximately 90 ° in the direction of the unit 1B, so that the unit 1A has an L-shape. By doing so, the space inside the portion on the other end side of the unit 1A is widened, the space for installing a blower fan such as a propeller fan is expanded, and the ventilation resistance of the side portion of the heat exchanger is reduced. The air flow distribution can be improved.

The present invention is not limited to the above-described embodiment, and various modifications can be made to the above-described embodiment without departing from the gist of the present invention.

[0022]

As described above, in the heat exchanger of the present invention, the plate-like fin group of each unit is separated from the plate-like fin group of the adjacent unit by a predetermined distance or more in the air flow direction. Thereby, even if it has a plurality of rows of heat transfer tubes, high heat transfer performance commensurate with the size can be obtained, and effective heat exchange can be performed. Therefore, the performance of the air conditioner can be improved, and the heat exchanger can be made more compact, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a partial longitudinal sectional view of FIG.

FIG. 3 is a graph showing the effect of the present invention.

FIG. 4 is a plan view of a second embodiment of the present invention.

FIG. 5 is a plan view of a third embodiment of the present invention.

FIG. 6 is a perspective view showing an example of a conventional heat exchanger.

[Explanation of symbols]

 1A, 1B unit 2 Plate fin 3 Heat transfer tube 4 Support plate

Claims (6)

[Claims] 1. A plurality of plate-like fins which are disposed substantially parallel to each other at predetermined intervals in a plate thickness direction and allow air flow to flow in a direction substantially parallel to the plate surface, A unit including a plurality of heat transfer tubes penetrating in a direction substantially perpendicular to the surface and arranged in a row in a direction substantially parallel to the plate surface and substantially perpendicular to the air flow. A plurality of heat exchangers, wherein the plate fin group of each unit is separated from the plate fin group of an adjacent unit by a predetermined distance or more in the flow direction of the airflow. Characterized heat exchanger. 2. The distance L between the center of the heat transfer tube of one unit and the upstream edge of the plate-like fin group of the unit adjacent to the unit on the downstream side of the air flow is the diameter of the heat transfer tube. The heat exchanger according to claim 1, wherein L ≥ 1.5D with respect to D. 3. The heat transfer pipe according to claim 1, wherein the heat transfer pipes have two rows and are connected to each other, and the heat transfer pipes are curved at one or a plurality of positions for each row. Heat exchanger. 4. The heat exchanger according to claim 3, wherein for each row, the heat transfer tubes are curved near the other end to form an L-shape. 5. An L-shaped heat transfer tube array having two heat transfer tube arrays connected to each other and one of the heat transfer tube arrays being curved near the other end. 2. The heat exchanger according to 1. 6. The air conditioner according to claim 1, wherein two adjacent rows of heat transfer tubes are arranged in a staggered manner so as not to overlap in the flow direction of the air flow. The heat exchanger as described.