JPH07280478A - Heat exchanger - Google Patents

Abstract

PURPOSE:To reduce formation of a dead water gone at a leeward side of a heat transfer tube by forming a vent hole for guiding flowing air to a rear surface side of a plate fin at a leeward side of an oblique rise continuously formed on an outer periphery of a seat of a fin collar. CONSTITUTION:A fin collar 4 for inserting a heat transfer tube 1 is formed at a heat transfer tube insertion part of a plate fin 2. A circular fin collar seat 5 is formed continuously at a base of the collar 4, an oblique rise 6 is continuously formed on its outer periphery, and an upper end of the rise 6 is coupled to a body of the fin 2. A vent hole 7 for guiding flowing air W to a rear surface side of the fin 2 is formed at a leeward side of the rise 6. The hole 7 is formed by louvering a louvered piece 7 except a coupled part at a center of a leeward side of the rise 6. Thus, the air W is guided to the rear surface of the fin 2 to reduce a dead water zone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross fin coil type heat exchanger used in an air conditioner.

[0002]

2. Description of the Related Art As a heat exchanger for an air conditioner, which is generally well known in the past, as shown in FIGS. 13 to 15, a plurality of heat transfer tubes 1, 1 ... A large number of waffle-shaped plate fins having at least two ridgelines 3 and 3 which are orthogonal to the heat transfer tubes 1, 1, ... And on both sides of the heat transfer tubes 1, 1 ,. There is a cross fin coil type which is provided with 2, 2, ... And allows heat exchange between the refrigerant flowing in the heat transfer tube 1 and the air W flowing in the surface of the plate fin 2. The fin collar 4 for inserting the heat transfer tube 1 is inserted into the heat transfer tube insertion portion of each plate fin 2 in this type of heat exchanger.
Then, a substantially circular fin collar seat portion 5 continuous with the base portion of the fin collar 4 and an inclined rising portion 6 continuous with the outer periphery of the fin collar seat portion 5 are formed. Reference numeral 7 is a tube sheet.

In the case of the heat exchanger having the above-mentioned structure, the circulating air is difficult to wrap around the leeward side of the heat transfer tube 1 from the place where it flows over the ridgeline 3 as shown by the arrow W, and the heat transfer on the fin surface is prevented. The leeward side of the heat pipe 1 is the dead water area. In such a dead water region, the contact between the fin surface and the air W cannot be obtained, so that the effective heat transfer area on the fin surface is reduced, which is a bottleneck in improving the performance of the heat exchanger. .

In order to reduce the dead water area as described above, it has been proposed to provide a protrusion on the leeward side of the heat transfer tube on the fin surface to guide the circulating air to the leeward side of the heat transfer tube ( (See JP-A-63-197884).

[0005]

However, in the case of the above-mentioned known example, in the case of a structure having flat plate fins, it may be possible to guide the circulating air to the leeward side of the heat transfer tube by forming the protrusions. However, FIGS.
As shown in FIG. 5, a large number of waffle-shaped plate fins 2, 2, ... Having at least two ridgelines 3, 3 which are on both sides of the heat transfer tube 1, 1 ,.
In the structure having the above, there is a problem that it is difficult to guide the circulating air W to the leeward side of the heat transfer tube 1 by forming protrusions from the place where the circulating air W flows over the ridgeline 3.

The present invention has been made in view of the above points, and an object of the present invention is to make it possible to greatly reduce the dead water region generated on the leeward side of a heat transfer tube by a simple means.

[0007]

According to the present invention, a plurality of heat transfer tubes arranged in parallel are provided, and at least two heat transfer tubes which are orthogonal to the heat transfer tubes and are continuous in the tube row direction on both sides of the heat transfer tube in the tube row direction. A plurality of waffle-shaped plate fins having two ridges, a fin collar for inserting the heat transfer tube into the heat transfer tube insertion portion of the plate fin, and a substantially circular fin collar seat portion continuous to the base portion of the fin collar. And a sloped rising part that is continuous with the outer periphery of the fin collar seat part. In the heat exchanger, a through hole is formed on the leeward side of the rising part for guiding the circulating air to the back side of the plate fin. The above configuration is the basic configuration.

The through hole may be a cut and raised trace of a cut and raised piece formed by cutting and raising both side portions of the connecting portion while leaving the connecting portion at the leeward side central portion of the rising portion.

A pair of cut-and-raised pieces is formed by cutting and raising a connecting portion side edge of the through hole and an opening edge facing the connecting portion side opening edge, and cutting and raising the cut and raised piece in a direction along the fin surface in a double-opening manner along the fin surface. In some cases,

In the case where the cut-and-raised pieces are formed by cutting and raising the connecting portion side rim of the through hole or the rim facing the connecting portion side rim, the cut and raised pieces are cut and raised in the direction along the fin surface with the base point. is there.

The cut-and-raised piece is cut and raised in the direction orthogonal to the fin surface with the fin collar seat portion side edge of the through hole or the lip edge facing the fin collar seat portion side edge as a base point. In some cases,

[0012]

In the basic configuration of the present invention, the air that flows in from the windward side of the heat transfer tube and flows along the surface of the plate fins is a through hole formed at the rising portion of the fin collar seat on the leeward side of the heat transfer tube. The air is guided to the back side of the plate fins via the heat exchanger, and the circulating air comes into contact with the back side of the plate fins on the leeward side of the heat transfer tube. Therefore, the dead water area generated on the lee side of the heat transfer tube in the plate fin is significantly reduced.

When the through hole is a cut-and-raised mark of a cut-and-raised piece formed by cutting and raising both side portions of the connecting portion while leaving the connecting portion at the center on the leeward side of the rising portion, or When the raised piece is cut and raised in the direction orthogonal to the fin surface with the fin collar seat portion side edge of the through hole or the mouth edge facing the fin collar seat portion side edge being raised and cut, In addition to the above-described effect, heat exchange due to contact between the cut and raised piece and the circulating air can be expected. When the cut-and-raised piece is cut and raised in the direction perpendicular to the fin surface with the fin collar seat portion side edge of the through hole cut and raised, the cut-and-raised piece acts as a guide for circulating air. Therefore, it is possible to smoothly guide the circulating air to the leeward side rear surface of the heat transfer tube in the plate fin.

A pair of the cut-and-raised pieces are formed by cutting and raising a connecting portion side edge of the through hole and an opening edge facing the connecting portion side edge, and cutting and raising the cut and raised pieces in a direction along the fin surface in a direction of a double-sound. Alternatively, the cut-and-raised piece is cut and raised in the direction along the fin surface with the connecting portion-side rim of the through hole or the rim facing the connecting-portion-side rim cut and raised. In such a case, the above-described action is obtained, and since the cut-and-raised piece acts as a guide for the circulating air, the circulating air can be smoothly guided to the leeward side rear surface of the heat transfer tube in the plate fin. Also, heat exchange due to contact between the cut and raised pieces and the circulating air can be expected.

[0015]

According to the present invention, the air that flows in from the windward side of the heat transfer tube and flows along the surface of the plate fins is passed through the air flow formed in the rising portion of the fin collar seat on the leeward side of the heat transfer tube. Since it can be guided to the back side of the plate fin through the holes so that the circulating air comes into contact with the back side of the plate fin on the lee side of the heat transfer tube, the death that occurs on the lee side of the heat transfer tube in the plate fin. Since the water area is significantly reduced, the effective heat transfer area of the plate fins is significantly increased (that is, the fin efficiency is improved), which has an excellent effect of greatly contributing to the improvement of the heat transfer performance.

When the through hole is a cut-and-raised mark of a cut-and-raised piece formed by cutting and raising both side portions of the connecting portion while leaving the connecting portion at the leeward side central portion of the rising portion, or When the raised piece is formed by cutting and raising the fin collar seat portion side edge of the through hole or the lip facing the fin collar seat portion side edge in a direction orthogonal to the fin surface as a base point, In addition to the above-described effects, heat exchange due to contact between the cut and raised piece and the circulating air can be expected, and heat transfer performance can be further improved. When the cut-and-raised piece is cut and raised in the direction perpendicular to the fin surface with the fin collar seat portion side edge of the through hole cut and raised, the cut-and-raised piece acts as a guide for circulating air. Therefore, it is possible to smoothly guide the circulating air to the leeward side rear surface of the heat transfer tube in the plate fin, which contributes to further reduction of the dead water area.

A pair of cut-and-raised pieces are formed by cutting and raising a rim on the side of the connecting portion in the through hole and a rim opposite to the rim on the side of the connecting portion, and cutting and raising the cut-and-raised piece in a double-opening shape in a direction along the fin surface with a base point. Alternatively, the cut-and-raised piece is cut and raised in the direction along the fin surface with the connecting portion-side rim of the through hole or the rim facing the connecting-portion-side rim cut and raised. In that case, the action and effect described above can be obtained, and since the cut-and-raised piece acts as a guide for the circulating air, it is possible to smoothly guide the circulating air to the leeward side back surface of the heat transfer tube in the plate fin. Contributes to further reduction of water area.
Further, heat exchange due to contact between the cut and raised piece and the circulating air can be expected, and the heat transfer performance is further improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIGS. 1 and 2 show the essential parts of a heat exchanger according to Embodiment 1 of the present invention.

The outdoor unit heat exchanger according to the present embodiment includes a plurality of heat transfer tubes 1, 1 ... Arranged in parallel with each other and the heat transfer tubes 1, 1 ,. It is configured to have a large number of plate fins 2, 2, ..., Which are orthogonal to each other (see FIG. 13), between the refrigerant flowing through the heat transfer tubes 1, 1 ,. Heat is exchanged with the air flowing through the air flow passage to act as an evaporator (during heating operation) or a condenser (during cooling operation).

Each of the plate fins 2 has a waffle shape having at least two ridge lines 3, 3 which are on both sides of the heat transfer tubes 1, 1, ... In the tube row direction and which are continuous in the tube row direction. In the heat transfer tube insertion part of the plate fin 2,
A fin collar 4 through which the heat transfer tube 1 is inserted, and a fin collar seat 5 having a substantially circular shape continuous with the base of the fin collar 4.
An inclined rising portion 6 which is continuous with the outer circumference of the fin collar seat portion 5 is formed. Reference numeral 7 is a tube sheet.

In this embodiment, on the leeward side of the rising portion 6, there are formed through holes 7, 7 for guiding the circulating air W to the back side of the plate fin 2.

The through holes 7, 7 leave the connecting portion 8 in the center on the leeward side of the rising portion 6, and the side portions of the connecting portion 8 are connected to the connecting portion side edge 7a of each of the through holes 7. A pair of cut-and-raised pieces 9, 9 formed by cutting and raising a mouth edge 7b facing the connecting portion side mouth edge 7a in a direction along the fin surface are cut and raised in a direction along the fin surface. The cut-and-raised pieces 9 are projected toward the leeward side so as to guide the circulating air W.

The following effects can be obtained in the heat exchanger configured as described above.

That is, the air W that flows in from the windward side of the heat transfer tube 1 and flows along the surface of the plate fins 2 is on the leeward side of the heat transfer tube 1 via the through holes 7 and 7 and the back surface side of the plate fins 2. Be guided to. Therefore, the circulating air W comes into contact with the back surface side of the plate fins 2 on the leeward side of the heat transfer tube 1, and the dead water region generated on the leeward side of the heat transfer tube 1 in the plate fins 2 is significantly reduced, which is effective in the plate fins 2. A large increase in the heat transfer area (that is, improvement in fin efficiency) can be obtained. As a result, the heat transfer performance can be improved.

The through holes 7 are formed by cutting and raising cut-and-raised pieces 9, 9 by cutting and raising both side portions of the connecting portion 8 while leaving the connecting portion 8 at the leeward side central portion of the rising portion 6. As it is a raised mark, the cut and raised pieces 9, 9 and the circulating air W
Since heat exchange due to contact with can be expected, the heat transfer performance can be further improved.

Further, the cut-and-raised pieces 9 and 9 are formed by cutting and raising a connecting portion side edge 7a of each of the through holes 7 and an edge 7b opposite to the connecting portion side mouth edge 7a and extending in a direction along the fin surface as a base point. Since the cut-and-raised pieces 9 act as a guide for the circulating air W, the heat-transfer tube 1 in the plate fin 2 has a pair of cut-and-raised parts.
Since the circulating air W can be smoothly guided to the leeward side rear surface, it contributes to the further reduction of the dead water area.

Embodiment 2 FIGS. 3 and 4 show the essential parts of a heat exchanger according to Embodiment 2 of the present invention.

In the case of the present embodiment, the through hole 7 is formed by cutting and raising the rim 7b facing the connecting portion side rim 7a in the through hole 7 and cutting and raising in the direction along the fin surface with the starting point as the starting point. It is said to have been cut and raised. According to this structure, one cut-and-raised piece 9 may be cut and raised when the through hole 7 is formed, which facilitates the formation of the through hole 7. Other configurations, functions, and effects are the same as those in the first embodiment, and the description thereof will be omitted to avoid duplication.

Embodiment 3 FIGS. 5 and 6 show the essential parts of a heat exchanger according to Embodiment 3 of the present invention.

In the case of the present embodiment, the through holes 7 are cut and raised traces of the cut and raised pieces 9 which are cut and raised in the direction along the fin surface with the connecting portion side edge 7a of the through holes 7 being cut and raised. ing. According to this structure, one cut-and-raised piece 9 may be cut and raised when forming the through hole 7,
The formation of the through holes 7 becomes easy. Other configurations, functions, and effects are the same as those in the first embodiment, and the description thereof will be omitted to avoid duplication.

Embodiment 4 FIGS. 7 and 8 show the essential parts of a heat exchanger according to Embodiment 4 of the present invention.

In the case of this embodiment, the cut-and-raised portion of the cut-and-raised piece 9 is formed by cutting and raising the fin collar seat portion side edge 7c of the through-hole 7 in the direction orthogonal to the fin surface. It is said that. The cut-and-raised piece 9 is cut and raised so as to be parallel to the fin collar seat portion 5 and project toward the leeward side, and acts as a guide for guiding the circulating air W to the back surface side of the plate fin 2. Other configurations, functions and effects are the same as those of the first embodiment, and the description will be omitted to avoid duplication.

Embodiment 5 FIGS. 9 and 10 show the essential parts of a heat exchanger according to Embodiment 5 of the present invention.

In the case of the present embodiment, the through hole 7 is formed by cutting and raising an edge 7d of the through hole 7 which faces the edge 7c on the fin collar seat portion side, and is on the windward side in a direction orthogonal to the fin surface with a base point. The cut-and-raised piece 9 is formed by cutting and raising it. The cut-and-raised piece 9 may be parallel to the fin collar seat portion 5 in addition to the diagonal upward direction as in the present embodiment. In the case of the present embodiment, the cut-and-raised pieces 9 cannot be expected to have a function of guiding the circulating air W. Other configurations, functions and effects are the same as those of the first embodiment, and the description will be omitted to avoid duplication.

Embodiment 6 FIGS. 11 and 12 show the essential parts of a heat exchanger according to Embodiment 6 of the present invention.

In this embodiment, the through hole 7 is formed by partially cutting the rising portion 6. In this case, the action of guiding the circulating air W and the heat exchange action with the cut and raised piece cannot be expected. Other configurations, functions and effects are the same as those of the first embodiment, and the description will be omitted to avoid duplication.

The invention of the present application is not limited to the configuration of each of the above-mentioned embodiments, and it goes without saying that the design can be appropriately changed without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional front view of essential parts of a heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged vertical sectional front view of a main part of a heat exchanger according to a second embodiment of the present invention.

4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is an enlarged vertical sectional front view of a main part of a heat exchanger according to a third embodiment of the present invention.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is an enlarged vertical sectional front view of a main part of the heat exchanger according to the fourth embodiment of the present invention.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is an enlarged vertical sectional front view of a main part of a heat exchanger according to a fifth embodiment of the present invention.

10 is a sectional view taken along line XX of FIG.

FIG. 11 is an enlarged vertical sectional front view of a main part of the heat exchanger according to the sixth embodiment of the present invention.

12 is a sectional view taken along line XII-XII in FIG. 7.

FIG. 13 is a perspective view of a conventionally known heat exchanger.

FIG. 14 is an enlarged vertical sectional front view of a main part of a conventionally known heat exchanger.

15 is a sectional view taken along line XV-XV in FIG.

[Explanation of symbols]

1 is a heat transfer tube, 2 is a plate fin, 3 is a ridge line, 4 is a fin collar, 5 is a fin collar seat portion, 6 is a rising portion,
7 is a through hole, 7a is a connecting portion side edge, 7b is a non-connecting portion side edge,
7c is a fin collar seat side edge, 7d is an anti fin collar seat side edge, 8 is a connecting portion, 9 is a cut and raised piece, and W is circulating air.

Claims (5)

[Claims] 1. A large number of waffle shapes having a plurality of heat transfer tubes arranged in parallel and at least two ridge lines which are orthogonal to the heat transfer tubes and are on both sides of the heat transfer tube in the tube row direction and continuous in the tube row direction. And a fin collar for inserting the heat transfer tube into the heat transfer tube insertion portion of the plate fin, a substantially circular fin collar seat portion continuous to the base portion of the fin collar, and an outer circumference of the fin collar seat portion. A heat exchanger formed with a continuous inclined rising portion, wherein a through hole for guiding circulating air to the back side of the plate fin is formed on the leeward side of the rising portion. Heat exchanger to. 2. The cut-and-raised mark of the cut-and-raised piece formed by cutting and raising both side portions of the connecting portion, leaving the connecting portion at the leeward side central portion of the rising portion. The heat exchanger according to claim 1, wherein the heat exchanger is a heat exchanger. 3. The cut-and-raised piece is cut-and-raised in the direction of the fin surface in the direction along the fin surface with the base-side rim of the through-hole and the rim facing the joint-side rim being cut and raised. The heat exchanger according to claim 2, wherein the heat exchanger is a pair. 4. The cut-and-raised piece is cut and raised in the direction along the fin surface with the base edge of the connecting portion side of the through hole or the edge facing the connecting portion side edge being cut and raised. The heat exchanger according to claim 2, wherein the heat exchanger is a heat exchanger. 5. The cut-and-raised piece is cut-and-raised in a direction orthogonal to the fin surface with a fin collar seat portion side edge of the through hole or an edge facing the fin collar seat portion side edge as a base point. The heat exchanger according to claim 2, wherein the heat exchanger is a heat exchanger.