WO2005024309A1

WO2005024309A1 - Finned heat exchanger and method of manufacturing the same

Info

Publication number: WO2005024309A1
Application number: PCT/JP2004/012889
Authority: WO
Inventors: Shouichi Yokoyama; Hirokazu Sakai; Narito Yamaguchi; Takashi Sugio
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2003-09-05
Filing date: 2004-08-30
Publication date: 2005-03-17
Also published as: JP4511143B2; CN1833142A; CN100398917C; JP2005083606A; KR20060056945A; KR100740180B1

Abstract

A finned heat exchanger, comprising a front side heat exchanger (20) and a rear side heat exchanger (40). Each of the front side heat exchanger and the rear side heat exchanger further comprises a large number of fins (21, 41) arranged parallel with each other at specified intervals and a large number of heat transfer tubes (11) inserted into the fins generally perpendicular to the fins and allowing refrigerant to flow therein. The fins of the front side heat exchanger are so formed that each of the upstream side leading edge (22, 23) thereof and the downstream side trailing edge (32, 33) thereof is formed in bent shapes by two straight line parts forming a same obtuse angle and a curved part line part (24, 34) connecting these two straight lines to each other, and that a distance (B) between the upstream side leading edge and the downstream side trailing edge in an area near a once-through blower (5) among two areas held by the linear upstream side leading edge and the linear downstream side trailing edge of the fins is made shorter than a distance (A) between the upstream side leading edge and the downstream side trailing edge in an area apart from the once-through blower.

Description

Description Heat exchanger with fins and method for producing the same

The present invention relates to a finned heat exchanger and a method for manufacturing the same. Background art

Generally, as shown in Fig. 5, the indoor unit of an air conditioner is provided with one or more suction ports such as a suction port 62a on the front and a suction port 62b on the top, and a bottom At least one outlet such as an outlet 63 is provided, and a once-through blower 65 and a heat exchanger with fins 64 are housed in the housing 61.

The conventional heat exchanger with fins 64 is disposed on the front side inside the housing 61, and has a main front-side heat exchanger 64A that is bent near the center in the vertical direction, and the housing 6 The rear heat exchangers 64 B arranged on the rear side of the inside of 1 and the auxiliary heat exchangers 64 C and 64 D attached to the front of the front heat exchanger 64 A, respectively It is composed of The front-side heat exchanger 64A and the rear-side heat exchanger 64B arrange the once-through blower 65 such that it surrounds the windward side from the windward side. Contains a heat exchanger. The auxiliary heat exchangers 64 C and 64 D are provided to improve the heat exchange capacity, but are different from the main front heat exchanger 64 A and the rear heat exchanger 64 B. After being manufactured in the process of, it is additionally connected to the main front heat exchanger 64 A and the rear heat exchanger 64 B, and is attached. Fig. 5 shows a case where an additional connection is made to the main front-side heat exchanger 64A. In addition, near the bent portion of the front-side heat exchanger 64 A, if the front-side heat exchanger 64 A is simply bent and there is a space without fins, almost no heat exchange occurs and the airflow is reduced. A spacer 66 is provided to prevent this from happening because it may pass through the heat exchanger.

On the other hand, the bending process of the front-side heat exchanger 64 A is unnecessary, and the airflow passes through the heat exchanger with fins without heat exchange while eliminating the spacer 66. As a structure for preventing this, a specification in which a front-side heat exchanger is formed in an arc shape is disclosed in the specification of Japanese Patent No. 3091830.

As shown in Fig. 6A, Fig. 6B and Fig. 7, this patent specification encloses a part of the periphery of the once-through blower 73 with the shape of the fin 72 of the front-side heat exchanger 71A. Thus, an indoor unit of an air conditioner formed in an arc shape is disclosed. A plurality of rows of heat transfer tubes 74 inserted through the front-side heat exchanger 71 A at a substantially right angle are provided, and an isosceles triangle is formed between the upwind side row and the downwind side row of these heat transfer tubes 74. It is arranged so as to draw. Consequently, as a result, the step pitch A of the leeward heat transfer tubes 74 arranged inside the arc-shaped portion is equal to the step pitch of the heat transfer tubes 74 arranged in the windward row arranged outside the arc-shaped portion. It is formed smaller than B.

According to this configuration, the spacer 66 is not required, and no waste material is generated at a location corresponding to the spacer 66 in the material of the fin 72 at the time of manufacturing. The amount of waste material can be reduced, and the bending pitch of the hairpin and return bend that connects the heat transfer tubes 74 There is an advantage that only three types, A, B and C, are required. Further, since the spacer 66 is not provided, the area of the fins 72 is increased by a portion corresponding to the spacer 66, and the heat exchange capacity is improved.

However, in the heat exchanger with fins described in the above patent specification, the front heat exchanger 71A has an arc shape, and the upper part of the fins 72 has a gentler slope, so that the heat exchanger with fins is loose. When the condenser is used as an evaporator, the condensed water stays at the top of the fins 72, or in the worst case, the condensed water does not flow along the fins 72 and the once-through blower 73 Water droplets may fall onto the air outlet and scatter from the outlet 75.

The present invention solves such a conventional problem, and improves the form of the heat exchanger with fins and the method for manufacturing the same, and reduces the space in the indoor unit of the air conditioner, particularly the depth is narrow. A heat exchanger with fins as large as possible is housed in the space to significantly improve the heat exchange capacity and to allow water condensed on the fin surface to flow smoothly down the fins when used as an evaporator. It is an object of the present invention to provide a heat exchanger with a fin that can perform the heat treatment.

It is another object of the present invention to provide a method for manufacturing a heat exchanger with fins, which can manufacture a heat exchanger with fins at low cost. Disclosure of the invention

In order to solve the above-described problems, a heat exchanger with fins of the present invention includes a housing provided with a suction port on the front surface side and a blowout port on the lower surface side, and a once-through blower housed in the housing. Installed in an indoor unit of an air conditioner with a wind circuit

In the middle of the wind circuit from the suction port to the once-through blower or once-through blower It consists of a front-side heat exchanger and a rear-side heat exchanger that are placed in the wind circuit from the machine to the outlet.

The front-side heat exchanger and the rear-side heat exchanger are arranged in parallel at predetermined intervals, and a number of fins through which gas flows, and a refrigerant inserted into the fins at a substantially right angle to allow the refrigerant to flow inside. Composed of a number of flowing heat transfer tubes,

The fin in the front-side heat exchanger is folded by the two straight line portions, the upwind leading edge and the leeward trailing edge each forming the same obtuse angle, and one curved portion connecting these two straight lines. Of the two regions sandwiched between the straight leeward leading edge and the straight leeward trailing edge of the bent fin, The distance between the leeward leading edge and the leeward trailing edge in the region is shorter than the distance between the leeward leading edge and the leeward trailing edge in the region farther from the once-through blower.

According to this configuration, the leeward leading edge and the leeward trailing edge of the fin in the front-side heat exchanger respectively connect two straight portions forming the same obtuse angle and connect between these two straight lines. The two regions formed between the straight frontward edge of the fin and the straight rearward edge of the fin in the bent front-side heat exchanger The distance between the leeward leading edge and the leeward trailing edge in the area closer to the once-through blower is shorter than the distance between the leeward leading edge and the leeward trailing edge in the area farther from the once-through blower. This allows a larger heat exchanger with fins to be accommodated in a limited space, especially in a space with a small depth, and exhibits a greater heat exchange capacity. In addition, the front side heat exchanger does not need to be bent later, and the spacer required when bent is naturally unnecessary. . When this heat exchanger with fins is used as an evaporator, water droplets condensing on the fins in each of the front-side heat exchanger and the rear-side heat exchanger travel along both continuous fins. Runs down smoothly. In addition, the upper side of the fin in the front heat exchanger is inclined at a constant angle close to the vertical line between the straight line on the windward leading edge and the straight line on the leeward trailing edge. No water droplets condensing on the surface of the glass stay.

In the heat exchanger described above, the distance between the leading edge and the trailing edge on the side close to the once-through blower is set to 20 to 23 mm, and the distance farther from the once-through blower is increased. The distance between the windward leading edge and the leeward trailing edge in the area is set to 24 to 27 mm.

According to this configuration, of the two areas sandwiched between the straight upwind front edge and the straight downwind edge of the fin in the bent front-side heat exchanger, the area farthest from the once-through blower The distance between the leeward leading edge and the leeward trailing edge is as thin as 24 to 27 mm in the area, and the distance between the leeward leading edge and the leeward trailing edge in the area near the once-through blower is Since it is made even thinner to 20 to 23 mm, the depth required for the wind circuit including the heat exchanger can be made considerably smaller, and therefore, the indoor unit can be made thinner. it can.

In the above-mentioned heat exchanger, both the leeward leading edge side and the leeward trailing edge side of the fin have the same shape.

According to this configuration, since the curved portions of the windward leading edge and the leeward trailing edge of the fin of the front-side heat exchanger have the same shape, when the fin is continuously pressed, the fin is continuously pressed. Since there is no waste of waste materials, efficient production can be achieved.

In addition, the curved part of the fin of the front-side heat exchanger in the above-mentioned heat exchanger Are arc-shaped.

According to this configuration, the curved portions of the windward leading edge and the leeward trailing edge of the fin in the front-side heat exchanger are formed in an arc shape, thereby facilitating processing and maintenance of the fin press die. It will be easier.

In the above-described heat exchanger, the leeward leading edge and the leeward trailing edge of the fin in the rear side heat exchanger are formed of straight lines parallel to each other, and the leeward leading edge and the leeward trailing edge of the fin. The distance to the edge is the windward in the area farther from the once-through blower, of the two areas between the straight windward leading edge and the linear leeward trailing edge of the fin in the front heat exchanger. It is equal to the distance between the leading edge and the leeward trailing edge.

According to this configuration, the upwind leading edge and the downwind trailing edge of the rear-side heat exchanger are constituted by parallel straight lines, so that a larger heat exchanger with fins can be accommodated in a limited space. A larger heat exchange capacity can be exhibited. In addition, the fin can be a single fin in which the upper end of the fin in the front heat exchanger is connected to the upper end of the fin in the rear heat exchanger. In such a case, continuous press working can be performed with high productivity.

In the above-mentioned heat exchanger, of the two regions sandwiched between the straight leeward leading edge and the linear leeward trailing edge of the fin in the front-side heat exchanger, the region farther from the once-through blower The outer diameter of the heat transfer tube inserted in the fin portion of the heat transfer tube and the heat transfer tube inserted in the portion of the rear heat exchanger sandwiched between the straight portion on the windward front edge and the straight portion on the leeward rear edge is 4 to 6.4 mm, and three rows of heat transfer tubes are arranged in the row direction along the main flow direction of the gas, and the arrangement pitch of the heat transfer tubes in the step direction perpendicular to the main flow direction of the gas is 14 5 to 16 mm. According to this configuration, of the two regions sandwiched between the straight leeward leading edge and the linear leeward trailing edge of the fin in the front-side heat exchanger, the region farthest from the once-through blower and the back surface In the area between the straight part of the windward leading edge and the straight part of the leeward trailing edge of the side heat exchanger, heat transfer tubes with an outer diameter of 4 to 6.4 mm are arranged in three rows and stepwise pitch Is set to 14.5 to 16 mm, it is possible to obtain a high air-side heat transfer coefficient without increasing the ventilation resistance, and thus to improve the air volume at the same The ability to exchange can be demonstrated.

In the above-mentioned heat exchanger, of the two regions sandwiched between the straight leeward leading edge and the linear leeward trailing edge of the fin in the front-side heat exchanger, the region farther from the once-through blower There are two types of heat transfer tubes inserted into the fin portion of the fin and the heat transfer tube inserted in the portion of the rear heat exchanger sandwiched between the straight portion on the windward leading edge and the straight portion on the leeward trailing edge. Composed of heat transfer tubes of outer diameter,

Heat transfer tubes with the larger outer diameter are placed in the most upstream row of the gas flow, and near the refrigerant outlet when the finned heat exchanger is used as a condenser or gas cooler. Formed in one pass as a heat transfer tube or as a heat transfer tube near the refrigerant inlet when used as an evaporator,

When the heat exchanger with a fin is used as a condenser or a gas cooler, the heat transfer tube with the smaller outer diameter is used as the heat transfer tube on the upstream side of the refrigerant from the heat transfer tube with the larger outer diameter. When used as an evaporator or as an evaporator, the refrigerant is formed by four passes as a heat transfer tube on the downstream side of the refrigerant from the heat transfer tube with the larger outer diameter, and the refrigerant flows therethrough.

According to this configuration, the heat exchanger with the fin is connected to the condenser or the gas generator. A heat transfer tube near the refrigerant outlet when used as a scooter or a heat transfer tube with an outer diameter of 4 to 6.4 m2 near the refrigerant inlet when used as an evaporator, and the most wind of gas flow in three rows By arranging it in the upper row and forming it in one pass, it is possible to improve the heat transfer coefficient in the pipe and to arrange the airflow and the temperature difference between the air and the refrigerant in countercurrent flow, so that the heat exchange capacity is increased. be able to. In addition, since the refrigerant in this region has a high density, the flow resistance of the refrigerant does not increase so much that the increase of the heat exchange capacity is not prevented. In addition, when the heat exchanger with the fin is used as a condenser or gas cooler with an outer diameter of 4 to 6.4 mm, it is used as a heat transfer tube or evaporator near the refrigerant outlet. When the heat exchanger with fins is used as a condenser or gas cooler, a heat transfer tube with a smaller outer diameter than the heat transfer tube near the refrigerant inlet is formed in one pass near the refrigerant outlet. As a heat transfer tube on the upstream side of the heat transfer tube, or as a heat transfer tube on the downstream side of the heat transfer tube formed in one pass near the refrigerant inlet when the heat exchanger with fins is used as an evaporator. By forming it in four passes, it is possible to achieve both a high heat transfer coefficient in the pipe and a low refrigerant flow resistance, and to increase the heat exchange capacity.

In the above-described heat exchanger, of the two regions between the straight upwind front edge and the straight downwind edge of the fin in the front heat exchanger, The outer diameter of the heat transfer tube inserted into the fin portion and the outer diameter of the heat transfer tube inserted into the region between the curved upwind leading edge and the curved downwind trailing edge of the fin are respectively 6 The heat transfer tubes are arranged in two rows in a row direction which is in a direction along the main flow direction of the gas and has a range of 5 to 8.5 mm, and a step direction which is perpendicular to the main flow direction of the gas. According to this configuration, the arrangement pitch of the heat transfer tubes in the front direction is in the range of 16 to 22 mm, and the linear leeward leading edge and the linear leeward trailing edge of the fin in the front-side heat exchanger. Of the two areas sandwiched between the area near the once-through blower and the area sandwiched between the curved leeward edge of the front heat exchanger and the curved leeward edge, Although the heat transfer tubes with outer diameter of 6.5 to 8.5 mm are arranged in two rows and the stepwise pitch is set to 16 to 22 mm, the ventilation resistance in the two-row configuration is slightly higher. High heat transfer coefficient on the air side can be obtained, and the difference in ventilation resistance of the heat exchanger as a whole can be reduced to improve the wind speed distribution. You can demonstrate your ability.

Further, in the heat exchanger, a stepwise direction of a heat transfer tube inserted into a portion of an area between a curved upwind front edge and a curved downwind rear edge of the fin in the front heat exchanger is provided. The arrangement pitch is such that the row on the windward side of the gas flow is less than or equal to the row on the leeward side.

According to this configuration, the number of heat transfer tubes inserted in the stepped direction in the region between the curved frontward edge of the fin and the rearward curved edge of the fin in the front-side heat exchanger is reduced. By increasing the ventilation resistance in this area as much as possible, it is possible to make the wind speed distribution of the heat exchanger with fins more uniform and thus to exert a greater heat exchange capacity be able to.

In the heat exchanger, two regions sandwiched between a straight upwind front edge and a straight downwind edge of the fin in the front-side heat exchanger. There are two types of heat transfer tubes inserted into the fin part in the area near the once-through blower and the part between the curved upwind leading edge and the curved leeward trailing edge of the fin. It is composed of an outer diameter,

The heat transfer tubes having the larger outer diameter are arranged in the most leeward row of the gas flow, and near the refrigerant inlet when the heat exchanger with fins is used as a condenser or a gas cooler. The heat exchanger with the fin was used as a condenser or gas cooler for the heat exchanger tube used as a heat exchanger tube or as a heat exchanger tube near the refrigerant outlet when used as an evaporator. In this case, when used as a heat transfer tube downstream of the heat transfer tube having a larger outer diameter, or when used as an evaporator, a heat transfer tube upstream of the heat transfer tube having a larger outer diameter. As a result, the refrigerant is formed in two passes and the refrigerant flows therethrough.

According to this configuration, the heat exchanger near the refrigerant inlet when the heat exchanger with fins is used as a condenser or a gas cooler or the heat exchanger near the refrigerant outlet when used as an evaporator is used. Since the diameter is in the range of 6.5 to 8.5 mm, it is wider than any other heat transfer tubes, and it is arranged in the leeward row of the gas flow in a two-row configuration, it is formed in two passes. With respect to the temperature difference between the refrigerant and the refrigerant, the performance is improved by the counterflow arrangement, and the heat transfer coefficient in the pipe is slightly reduced, but the refrigerant flow resistance can be significantly reduced, and thus the heat exchange Capability can be greatly increased. In addition, when the heat exchanger with fin was used as a condenser or gas cooler with an outer diameter in the range of 6.5 to 8.5 mm, it was used as a heat transfer tube or evaporator near the refrigerant inlet. When cold When the heat exchanger with the fin is used as a condenser or gas cooler, the heat exchanger with the smaller outer diameter than the heat exchanger near the medium outlet is used.

When the heat exchanger with the fins is used as a heat exchanger tube downstream of the heat exchanger tube formed by the two paths with the largest outer diameter near the refrigerant outlet, or when the heat exchanger with the fin is used as an evaporator, By forming the heat transfer tube on the upstream side of the refrigerant from the heat transfer tube formed with two paths with the largest outer diameter in two passes, it is possible to improve the heat transfer coefficient in the tube and increase the heat exchange capacity .

In the above-mentioned heat exchanger, the shortest distance between the heat transfer tube and the leading or trailing edge of the fin is set to 1.8 mm or more.

According to this configuration, the distance between the heat transfer tube and the leading edge or the trailing edge of the fin is set to at least 1.8 mm, so that when the heat exchanger with the fin is used as an evaporator, It is possible to suppress the phenomenon that condensed water adhering to the fin surface and flowing down hits the heat transfer tube and jumps out from the windward leading edge or the leeward trailing edge of the fin.

In the above-mentioned heat exchanger, when the dehumidifying operation is performed by using the reheater and the evaporator separately in the stage direction, the straight upwind front edge of the fin in the front heat exchanger and the straight Of the two areas sandwiched between the leeward trailing edge and the area away from the once-through blower, the rear heat exchanger is used as a reheater,

Of the two areas between the straight leeward leading edge and the straight leeward trailing edge of the fin in the front-side heat exchanger, the area closer to the once-through blower and the curved fin of the fin The area between the windward leading edge and the curved leeward trailing edge is used as an evaporator.

According to this configuration, the heat loads of the reheater and the evaporator are properly balanced. Good dehumidification operation. In addition, since the reheater is disposed vertically above the evaporator, condensed water condensing on the fins in the area of the evaporator collides with the fin surface of the reheater and re-evaporates. Humidification of the room can be prevented.

Further, in the above-described heat exchanger, a plurality of cut-and-raised portions that are opened in the main flow direction of the gas are provided on the fin surface between the heat transfer tubes that are adjacent in the stage direction,

The rising portions of the cut-and-raised portions near the heat transfer tubes are formed in a direction substantially along the circumference of the heat transfer tubes, and the ratio of the width between the cut-and-raised portions in the column direction to the width of the cut-and-raised portions in the column direction. Is from about 2 to about 2.5.

According to this configuration, a plurality of cut-and-raised temperature boundary layer leading edges that are opened in the main flow direction of the gas on the fin surface between the heat transfer tubes adjacent in the stepwise direction have a high air-side heat transfer coefficient. In addition, the rising portion of the cut-and-raised portion near the heat transfer tube is formed in a direction roughly along the circumference of the heat transfer tube, so that the air flow can be guided to the downstream portion of the heat transfer tube, and therefore the effective transfer can be achieved. Since the heat area increases, heat exchange performance can be improved. By setting the ratio of the width between the cut-and-raised portions (fin substrate) in the column direction to the width in the column direction of the cut-and-raised portions to be about 2 to about 2.5, the conventional ratio is about 3 The heat exchange capacity can be improved as compared with the case.

In the heat exchanger, the height of the cut-and-raised portion is set to about 1/4 to about 3/4 of the pitch between adjacent fins.

According to this configuration, the cut-and-raised height is set to about 1/4 to about 3Z4 of the pitch between the adjacent fins, so that the wind halo at the same noise is reduced. It can be increased to achieve greater heat exchange capacity.

In the heat exchanger, the cut-and-raised height is set to about 1 Z2 of the pitch between adjacent fins in a region where the wind speed at which the finned heat exchanger approaches the once-through blower is high. In the other area, the pitch between adjacent fins is set to about 3Z4. According to this configuration, the height of the cut-and-raised portion is reduced by the wind speed at which the heat exchanger with the fin approaches the once-through blower. In a large area, the ventilation resistance is relatively large as about 1/2 of the pitch between adjacent fins, and in other areas, the ventilation resistance is about 3/4 of the pitch between adjacent fins. By making it smaller, the wind speed distribution of the heat exchanger with fins can be made more uniform, and therefore, a greater heat exchange capacity can be exhibited.

In the heat exchanger, the shortest distance between the cut-and-raised portion and the windward leading edge or the leeward trailing edge of the fin is set to 1.8 mm or more.

According to this configuration, the distance between the cut-and-raised edge and the leeward leading edge or the leeward trailing edge of the fin is at least 1.8 mm, so that the heat exchanger with the fin is used as an evaporator. However, it is possible to suppress the phenomenon that the condensed water attached to the fin surface flows down along the cut and rise, and jumps out from the leeward leading edge or the leeward trailing edge of the fin.

In the above-described heat exchanger, when there is a temperature difference between the refrigerant flowing inside the two heat transfer tubes adjacent to each other in the column direction, the fin at the center between the rows of the two heat transfer tubes is roughly arranged in a stepwise direction. A notch is provided along the direction. According to this configuration, when there is a temperature difference between the two heat transfer tubes adjacent to each other in the column direction and the temperature of the fluid flowing inside the heat transfer tubes, the fin at the center between the rows of the two heat transfer tubes has a direction substantially along the step direction. By providing the notches, heat exchange loss due to heat conduction through the fins can be prevented, so that the heat exchange capacity does not decrease.

Further, in the above-described heat exchanger, when the dehumidifying operation is performed using the heat exchanger divided into a reheater and an evaporator in a stepwise direction, a fin portion between the reheater area and the evaporator area is provided. A notch is provided to cut leaving only a small part that is not cut.

According to this configuration, when the heat exchanger with the fin is used in a stepwise manner by dividing the heat exchanger into a reheater and an evaporator to perform the dehumidification operation, the above-mentioned filter between the reheater area and the evaporator area is used. By providing a notch that cuts almost completely, leaving only a small part that is not cut, it is possible to prevent a significant decrease in heat exchange capacity due to heat conduction of the fin. In addition, when the entire heat exchanger with fins is used as an evaporator, water that condenses on the fin surface does not stay in the cuts, but smoothly passes through the very small connected portions of the fins. Can flow down.

In the above-described heat exchanger, any one of HFC refrigerant, HC refrigerant and carbon dioxide is used as the refrigerant flowing inside the heat transfer tube.

This configuration contributes to the protection of the global environment by using one of HFC refrigerant, HC refrigerant and carbon dioxide with a low ozone destruction coefficient as the refrigerant fluid flowing inside the heat transfer tubes. can do. In particular, HC refrigerant and carbon dioxide are refrigerants with a low global warming potential, which can further contribute to the protection of the global environment. Further, in the above-described heat exchanger, the heat exchanger is manufactured in a state where the upper end of the fin of the front heat exchanger and the upper end of the fin of the rear heat exchanger are connected.

A gasket of a fin collar for inserting a heat transfer tube formed in a fin in a state where the upper end of the fin in the front-side heat exchanger and the upper end of the fin in the back-side heat exchanger are connected. For the pitch in the step direction that is perpendicular to the main flow direction,

The arrangement pitch of the fin collars at an adjacent location at the boundary between the front-side heat exchanger and the rear-side heat exchanger is set to be shorter than the arrangement pitch in other step directions.

According to this configuration, the pitch in the step direction of the fin collar at the location adjacent to the boundary between the front heat exchanger and the rear heat exchanger is equal to the pitch in the other adjacent steps. As a result, it is possible to reduce the amount of fin wood waste.

The method for manufacturing a heat exchanger according to the present invention is a method for manufacturing a heat exchanger as described above including a front-side heat exchanger and a back-side heat exchanger,

The upper end of the fin in the front-side heat exchanger and the upper end of the fin in the back-side heat exchanger are continuously pressed as one fin in a state where they are connected at a boundary. After laminating a large number of fins,

Next, a method is provided in which each of the fins is cut at a boundary between the front-side heat exchanger and the rear-side heat exchanger, and separated into the front-side heat exchanger and the rear-side heat exchanger.

According to this manufacturing method, the heat exchanger with fins can be manufactured more efficiently than when the front heat exchanger and the rear heat exchanger are manufactured separately. Can. Also, heat transfer tubes inserted into one fin with different diameters, different numbers of rows, different row pitches or different step pitches may be mixed. Objects with different heights can be mixed.

In the heat exchanger manufacturing method described above, the upper end of the fin of the front-side heat exchanger and the upper end of the fin of the rear-side heat exchanger are connected as a single fin in a state of being connected at a boundary. When pressing continuously,

The pitch of the fin collars for inserting the heat transfer tubes is the same as the pitch of the other tiers in the portions adjacent to the fin collars formed on the front heat exchanger and the rear heat exchanger, respectively. After laminating a large number of fins that are formed shorter, heat pipes are passed through each fin collar,

Next, there is a method of separating the fins into the front side heat exchanger and the back side heat exchanger.

According to this manufacturing method, the pitch in the step direction of the fin collar at an adjacent portion at the boundary between the front heat exchanger and the rear heat exchanger is made equal to the pitch in the step direction in the other vicinity. As compared with the above, the waste material of the fin material can be reduced. Brief Description of Drawings

FIG. 1 is a cross-sectional view of an indoor unit of an air conditioner containing a finned heat exchanger according to an embodiment of the present invention,

Fig. 2 is a side view of the fin of the heat exchanger with fin,

Fig. 3 is an enlarged side view of the main part of the fin of the heat exchanger with fin. Figure 4 is a side view showing an image in which the fins of the heat exchanger with fins are continuously arranged in the feed direction of two presses.

Fig. 5 is a cross-sectional view of the indoor unit of an air conditioner containing a conventional heat exchanger with fins.

Fig. 6A is a schematic side view of the fin of another conventional finned heat exchanger, and Fig. 6B is an air conditioner housing the finned heat exchanger using the fin shown in Fig. 6A. Schematic sectional view of an indoor unit,

Fig. 7 is a diagram showing the relationship of the arrangement pitch of the heat transfer tubes in the fins of another conventional finned heat exchanger. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a heat exchanger with fins and a method for manufacturing the same according to an embodiment of the present invention will be described with reference to the drawings.

First, an indoor unit of an air conditioner on which the heat exchanger with fins according to the present embodiment is mounted will be described with reference to FIG. Figure 1 is a longitudinal sectional view of this indoor unit.

As shown in Fig. 1, the casing 2 of the indoor unit 1 of the air conditioner is provided with inlets 3a and 3b on the front and upper surfaces, and is provided with an outlet 4 on the lower surface. The housing 2 houses the once-through blower 5 and the heat exchanger 10 with fins.

The heat exchanger with fins 10 is composed of a front heat exchanger 20 arranged on the front side of the housing 2 and a rear heat exchanger 40 arranged on the rear side of the housing 2. The front-side heat exchanger 20 and the rear-side heat exchanger 40 are arranged so as to surround the once-through blower 5 from the windward side. Each of the heat exchangers 20 and 40 is arranged in parallel at a predetermined interval, and has a number of fins 21 and 41 through which air flows.

It has a large number of heat transfer tubes 11 inserted at right angles to 21 and 41 and through which a refrigerant (refrigerant fluid) flows, and has a front-side heat exchanger 20 and a rear-side heat exchanger 40. Means that the fins 21 and 41 are separated from each other, but act as one heat exchanger by connecting the heat transfer tubes 11

Next, a finned heat exchanger and a method of manufacturing the same according to the embodiment will be described with reference to FIG. 1 and FIGS.

FIG. 2 is a side view of the fin 21 of the heat exchanger 20 on the front side and the fin 41 of the heat exchanger 40 on the rear side of the heat exchanger with fins according to the embodiment, and FIG. FIG. 3 is an enlarged side view of a main part of a fin 21 of a heat exchanger 20. Fig. 4 shows a state in which the upper ends of the fins 21 of the front-side heat exchanger 20 and the fins 41 of the rear-side heat exchanger 40 of the heat exchanger with fins in Fig. 2 are connected at the boundary. FIG. 5 is a side view showing an image in which two fins formed by continuous press working as one fin 13 are continuously arranged in the press feed direction.

As shown in Fig. 2 and Fig. 3, the windward leading edge and the leeward trailing edge of the fin 21 of the front-side heat exchanger 20 have an angle 01 and an angle of intersection with each other. 0 Two straight parts with the same obtuse angle

It consists of 2 2, 2 3 and 3 2, 3 3, and one curved section 2 4, 3 4 connecting these two straight sections 2 2, 2 3 and 3 2, 3 3 respectively. It is formed in a substantially “U” shape, that is, in a bent shape. Here, the straight portions 22 and 32 and 23 and 33 are parallel to each other. The shapes of the curved sections 24 and 34 are elliptic curves and hyperbolas. However, the curved portion 24 at the leeward edge and the curved portion 34 at the leeward edge have the same dimensions and shape. In this embodiment, as shown in FIGS. 1 to 4, the curved portion 24 on the windward side edge and the curved portion 34 on the leeward side edge are formed in an arc shape, and these are the same. It is formed with a radius of curvature. The windward front edge and the leeward rear edge of the fin 41 of the rear-side heat exchanger 40 are composed of parallel straight portions 42 and 43.

One of the two areas sandwiched between the straight leeward leading edge of the fin 21 of the bent front heat exchanger 20 and the linear leeward trailing edge, which is closer to the once-through blower 5 The distance between the leeward leading edge and the leeward trailing edge of the region, i.e., the distance B between the leeward leading edge 23 and the leeward trailing edge 33 is greater than the leeward leading edge of the other region farther from the once-through blower 5. It is formed shorter than the distance from the leeward trailing edge, that is, the distance A between the leeward leading edge 22 and the leeward trailing edge 32. Note that one region indicates a portion above the bent portion of the heat exchanger 20 formed in a bent shape, and the other region indicates a heat exchanger 2 formed in a bent shape. The portion below the bent portion of 0 is shown.

In the heat exchanger with fins according to the present embodiment, the distance A between the parallel straight windward leading edge 22 and the leeward trailing edge 32 recommended from the viewpoints of heat transfer performance and ventilation resistance. (The area) is 24 to 27 mm, and the distance B (the other area) between the parallel straight windward leading edge 23 and the leeward trailing edge 33 is 20 to 23 mm .

As shown in Fig. 2 and Fig. 4, the distance between the windward leading edge 42 and the leeward trailing edge 43 of the fin 41 of the rear heat exchanger 40 is determined by the bent front heat exchanger. Of the two areas between the straight leeward leading edge of the fin 21 of the fan 20 and the straight leeward trailing edge of the The distance between the windward leading edge 2 2 and the leeward trailing edge 3 2 of the area is equal to A. These fins 21 of the front heat exchanger 20 and fins 41 of the rear heat exchanger 40 are As shown in FIG. 4, the fin is manufactured by continuously pressing as one fin 13 in which the upper ends are bordered at the boundary. Note that the angle between the fin forward direction and the leeward leading edge 22 or the leeward trailing edge 32 on the side far from the once-through blower 5 of the fin 21 of the front-side heat exchanger 20 is α. The angle between the straight upwind leading edge 2 3 or the downwind trailing edge 3 3. on the side close to the once-through blower 5 and the feed direction of the fin press is i3, and the feed width of one fin Then, the relational expression of _α + | 3: = 0 ΐ = 、 2, A / sin a = B / sin / 3 = C, holds, and the known 0 1 = Θ 2, A, B force, etc. , Β, and C are uniquely determined.

Also, as shown in Fig. 4, when fins 13 (21, 41) are manufactured by continuous pressing from a metal plate, the heat exchanger 10 with fins needs to be stored. Therefore, there is a portion that is cut and discarded at both ends and between the front-side heat exchanger 20 and the rear-side heat exchanger 40, but the waste material generated at that time 51, 52, 53 Only a few are used, and others are used without waste to produce fins 13 continuously.

As shown in FIG. 3, each fin 13 has a fin collar 12 burred in a round hole shape.

As shown in Fig. 4, the fins 21 of the front heat exchanger 20 and the fins 41 of the rear heat exchanger 40 are connected as a single fin with a continuous press working. The heat transfer tubes 11 are inserted (inserted) through the fin collars 12, and then the heat transfer tubes 11 are brought into close contact with the heat transfer tubes 11. Heat tube 1 1 The fins 13 are cut at the boundary between the front heat exchanger 20 and the rear heat exchanger 40 to form a front heat exchanger 20 and a rear heat exchanger 40. To separate.

As shown in Figs. 1 and 2, the so-called stepwise pitch is a direction perpendicular to the main flow direction (flow direction) of the gas (air) in the heat transfer tube 11 as shown in Figs. The number of rows, that is, the number of rows along the main flow direction of the gas, that is, the number of rows, is determined by the straight windward leading edge of the fin 21 of the bent front heat exchanger 20 and the straight leeward. Of the two areas sandwiched by the trailing edge and the area farther from the once-through blower 5, the straight windward leading edge 42 of the fin 41 of the rear heat exchanger 40 and the straight leeward It is formed differently from the region sandwiched by the trailing edges 43.

In other words, of the two areas sandwiched between the straight upwind front edge and the straight downwind rear edge of the fin 21 of the bent front-side heat exchanger 20, the side farther from the once-through blower 5 Area, i.e., the area sandwiched between the straight leeward leading edge 22 and the linear leeward trailing edge 32, and the straight leeward leading edge of the fins 41 of the rear heat exchanger 40. The heat transfer tubes 11 inserted into the fins 21 and 41 in the region sandwiched between the fin 42 and the straight leeward trailing edge 43 have an outer diameter in the range of 4 to 6.4 mm. Two types of outer diameter heat transfer tubes are used (configured), the larger heat transfer tube 11a and the smaller heat transfer tube 11b. The pitch D is formed as 14.5 to 16 mm. Of the two regions sandwiched between the straight upwind front edge and the straight downwind rear edge of the fin 21 of the bent front-side heat exchanger 20, it is closer to the once-through blower 5. Side region, i.e., the straight leeward leading edge 23 and the linear leeward trailing edge 33 Inserted into the fins 21 in the region between the curved frontward edge 24 and the curved rearward edge 34 of the front heat exchanger 20 As the heat pipes 11, two types of heat transfer pipes having an outer diameter of 6.5 to 8.5 mm, that is, a heat transfer pipe 11 c having a smaller outer diameter and a heat transfer pipe 11 d having a larger outer diameter are used. (Constructed), two rows are arranged in the column direction, and the pitch E in the step direction is formed as 16 to 22 mm.

In addition, as shown in FIG. 3, the heat transfer tubes inserted into the fins 21 in a region sandwiched between the curved leeward leading edge and the curved leeward trailing edge in the front-side heat exchanger 20. For the stepwise pitch E of 11 c and 11 d, the row pitch E u on the leeward side of the gas flow is equal to or less than the row pitch E d on the leeward side of the gas flow (the same or higher). Smaller).

FIG. 1 shows the flow of the refrigerant when the heat exchanger with fins 10 according to the present embodiment is used as an evaporator. The fins of the bent front-side heat exchanger 20 are shown in FIG. Of the two areas sandwiched between the straight leeward leading edge and the straight leeward trailing edge in 1 1, the area farther from the once-through blower 5, that is, the straight upwind leading edge 2 2 and the straight Area between the leeward trailing edge 32 of the rear heat exchanger 40 and the linear upwind leading edge 4 2 of the fin 41 of the rear heat exchanger 40 and the linear leeward trailing edge 4 3 Of the two types of heat transfer tubes 1 1 with a larger outer diameter among the two types of heat transfer tubes 11 with a diameter of 4 to 6.4 mm to be introduced into the fins 21 and 41 of the area, 1 1 a Are placed in the most upwind row of the gas flow, and used (formed) in one pass as a heat transfer tube near the refrigerant inlet when used as an evaporator, and with the smaller outer diameter Heat transfer tube 1 1b is cooled by heat transfer tube 1 1a with the larger outer diameter. Refrigerant is flowed by using (forming) the heat transfer tube on the downstream side in four passes. After that, except when the dehumidifying operation is performed, the refrigerant passes through the throttling means 80 for the dehumidifying operation in the fully open state and is bent Of the two areas sandwiched between the straight upwind front edge and the straight downwind rear edge of the fin 21 of the fin-shaped front-side heat exchanger 20, that is, the area near the once-through blower 5, that is, The area sandwiched between the straight leeward leading edge 23 and the straight leeward trailing edge 33, and the curved leeward leading edge 24 of the front heat exchanger 20 and the curved leeward rear Of the two types of heat transfer tubes 11 having a diameter in the range of 6.5 to 8.5 mm to be inserted into the fin (fin portion) 21 in a region sandwiched between the edge 34 and the outer diameter, The heat exchanger tubes 1 1 c flow in two passes (two paths), and finally, the refrigerant flows into the four heat exchanger tubes 1 with the larger outer diameter near the refrigerant outlet when used as an evaporator. 1d flows in two passes and exits the finned heat exchanger. Further, the four heat transfer tubes 11 d having a larger outer diameter near the refrigerant outlet when used as an evaporator are arranged in the most leeward row of the gas flow.

The heat transfer tubes 11 have four types of outer diameters.However, in terms of the outer diameter before expansion, the heat transfer tube 11a is approximately 6 mm, the heat transfer tube 11b is approximately 5 mm, It is recommended to use about 7 mm for the heat pipe 11 c and about 8 mm for the heat transfer pipe 11 d.

By the way, the case where the heat exchanger with fins 10 of the present embodiment is used as an evaporator has been described based on FIG. 1, but the heat exchanger with fins of the present embodiment is used as a condenser or gas. When used as a cooler, the flow direction of the refrigerant is reversed, but the other configuration is the same as when used as an evaporator. Further, when the heat exchanger with fins 10 of the present embodiment is used in a stepwise manner by being divided into a reheater and an evaporator to perform the dehumidifying operation, the bent front-side heat exchanger 20 is used. Of the two regions sandwiched between the straight leeward leading edge of the fin 21 and the linear leeward trailing edge, the region farther from the once-through blower 5, that is, the straight leeward leading edge 22 The area between the straight leeward trailing edge 32 and the rear heat exchanger 40 is used as a reheater, and the bent front heat exchanger 20 has a linear shape of the fin 21. Of the two areas sandwiched between the windward leading edge and the straight leeward trailing edge, the area closer to the once-through blower 5, namely, the straight leeward leading edge 23 and the linear leeward trailing edge 33 And the area sandwiched between the curved frontward edge 24 of the front heat exchanger 20 and the curved rearward edge 34 of the heat exchanger 20 are used as evaporators. During this dehumidifying operation, the refrigerant flows into the evaporator from the reheater through the throttling means 80 having an appropriate throttling amount as shown in FIG.

In addition, as shown in Fig. 4, the fins 21 of the front heat exchanger 20 and the fins 41 of the rear heat exchanger 40 were connected at the boundary between their upper ends. When the fins 13 are continuously pressed and manufactured as one fin 13 in the state, the fin collars 12 of the front-side heat exchanger 20 and the rear-side heat exchanger 40, respectively. The pitch of the part adjacent to each other in the column direction is set to a pitch F shorter than the pitch D in the other adjacent column direction.

As shown in FIG. 2 and FIG. 3, a portion of the fins 13 (21, 41) between the heat transfer tubes 11 adjacent to each other in the step direction has a plurality of openings that open in the main flow direction of the gas. 14 1, 15 1, 16 1, 14 2, 15 2 are provided, and each of these cuts 14 1, 15 1, 16 1, 16 1, 14 2, 15 2 Of the fin collar 1 2 That is, the rising portions 14 1, 15 1, 16 1, 14 2, and 15 2 of the cut-and-raised portions provided near the heat transfer tube 1 1 14 1 a, 15 1 a, 16 1 a, 14 2 a, and 15 2 a are formed in directions substantially along the circumference of the heat transfer tube 11.

Here, as shown in FIG. 3, adjacent cut-outs 14 1, 15 1, 1 1 in the column direction with respect to the width W s 1 of each cut-out 14 1, 15 1, 16 1 in the column direction. The width of the fin between 6 1 (the width of the flat part of the fin 21 adjacent in the column direction) The ratio of 13 1 ^ 13 1 no 51 and the width of the cut and raised 14 2, 15 2 in the column direction Ratio of W s 2 to the width of the fin between adjacent cut-outs 14 2 and 15 2 in the column direction (the width of the flat plate portion of the fins 21 and 41 adjacent in the column) W b 2 W b 2 / W s 2 is set to be about 2 to about 2.5.

In addition, the heights of the cut-outs 14 1, 15 1, 16 1, 14 2, 15 2 along the thickness direction of the fins 21, 41 are set to the adjacent fins 13 (21, 21). 4 1) The pitch is about 1/4 to about 3/4 of each other.

Furthermore, in order to obtain high heat exchange performance, the height of the cut-outs 141, 151, and 161 should be increased in areas where the wind speed is high, for example, close to the once-through blower 5 in FIG. In the area G, the pitch between adjacent fins 13 (21, 41) is about 1 Z2, and in other areas, the adjacent fins 13 (21, 41) are Approximately 3/4 of the pitch.

Also, as shown in Fig. 3, the heat transfer tubes 11a, lib, 11c, 11d and the windward leading edges 22, 23, 24, 42, or 42 of the fins 21, 41 The shortest distance L t to the lower trailing edge 3 2, 3 3, 3 4, 4 3 1 4 1, 1 5 1, 1 6 1, 1 4 2, 1 5 2 and fins 2 1, 4 1 windward leading edge 2 2, 2 3, 2 4, 4 2 or leeward trailing edge 3 2 , 33, 34, and 43, the shortest distance Ls is set to be 1.8 mm or more.

In addition, as shown in FIGS. 2 and 3, between two adjacent heat transfer tubes 11 in the column direction, when there is a temperature difference between the refrigerant flowing inside, the two heat transfer tubes 11 A cut 17 is provided in the fin portion at the center between the rows of the collars 1 2) in a direction generally along the step direction.

When the air conditioner is operated for dehumidification and the heat exchanger with fins 10 of the indoor unit 1 is divided into a reheater and an evaporator in the stage direction, the front side heat exchanger shown in Fig. 1 is used. In the exchanger 20, the lower part of the fin 21 from the curved parts 24, 34 is used as an evaporator and the other part is used as a reheater. At a point between the region and the region of the evaporator, there is provided a notch 19 for cutting almost completely, leaving a very small portion 18 not to be cut.

Further, as the refrigerant flowing (flowing) inside the heat transfer tube 11 of the heat exchanger with fins 10, any one of HFC refrigerant, HC refrigerant and carbon dioxide is used.

As described above, the fins 21 and 41 of the front-side heat exchanger 20 and the rear-side heat exchanger 40 are each a single fin 13 whose upper end is connected at the boundary. It is manufactured by continuous press working, and after laminating many fins 13, the heat transfer tube 11 is inserted into the fin collar 12 (through) to expand the tube, and the front heat exchanger 20 and the back side heat exchanger 40 are connected by fins 13 (21, 41) Then, the front-side heat exchanger 20 and the rear-side heat exchanger 40 are cut at the boundary between the fins 21 and 41, and the front-side heat exchanger 20 and Production is performed separately from the rear heat exchanger 40.

As described above, the windward leading edge and the leeward trailing edge of the fin 21 of the front-side heat exchanger 20 have two straight portions each having the same obtuse angle and the straight portion between these two straight lines. Are formed in a bent shape consisting of a single curved part that connects the straight-line windward front edge and the straight-line leeward rear edge of the fin 21 of the bent front-side heat exchanger 20. The distance between the windward leading edge 23 and the leeward trailing edge 33 of one of the two areas closer to the once-through blower 5 is set to the upstream of the other area farther from the once-through blower 5. By making the distance between the edge 22 and the leeward trailing edge 32 smaller, the heat exchanger with a large fin can be accommodated in a limited space, especially in a space with a small depth, and a larger space can be accommodated. It can demonstrate heat exchange capacity. Further, the front-side heat exchanger 20 does not need to be bent later, and of course, does not require a spacer which is required when bending. When this heat exchanger with fins 10 is used as an evaporator, water condensed on the fins 21 and 41 of the front heat exchanger 20 and the rear heat exchanger 40 is continuous. It flows down the fins 21 and 41 smoothly. In addition, the upper side of the fin 21 of the front-side heat exchanger 20 is inclined at a constant angle close to the vertical, surrounded by the straight line of the windward leading edge 22 and the straight line of the leeward trailing edge 32. Therefore, water droplets condensing on the surface of the fin during evaporation do not stay.

Further, of the two regions sandwiched between the straight upwind front edge and the straight downwind rear edge of the fin 21 of the bent front-side heat exchanger 20, it is far from the once-through blower 5. The area on the side close to the once-through blower 5 at the same time as being thin, with the distance between the upstream side 緣 2 2 and the leeward side 2 32 in the side area being 24 to 27 mm The distance between the windward leading edge 23 and the leeward trailing edge 33 is made thinner, 20 to 23 mm, so that the depth required for the wind circuit including the heat exchanger is significantly smaller. Therefore, the indoor unit 1 can be reduced in thickness.

In addition, the fins 13 of the front-side heat exchanger 20 have the same shape for the curved portions 24 and 34 of the windward leading edge and the leeward trailing edge, so that the fins 13 are continuous. In press working, it is possible to efficiently produce fins 13 without wasting too much waste material 51, 52, 53.

In addition, the curved portions 24 and 25 of the fin 21 and the leeward edge of the fin 21 of the front-side heat exchanger 20 are formed in an arc shape, so that the press metal of the fin 13 is formed. Processing and maintenance of the mold become easier.

In addition, by making the windward leading edge 42 and the leeward trailing edge 43 of the rear side heat exchanger 40 parallel straight lines, the heat exchanger with large fins in a limited space 10 Can be stored to exhibit greater heat exchange capacity.

The fin 13 of the heat exchanger 10 with fins is bent in the distance between the windward leading edge 42 and the leeward trailing edge 43 of the fin 41 of the rear heat exchanger 40. Windward of the area farther from the once-through blower 5 of the two areas sandwiched between the straight windward leading edge and the straight leeward trailing edge of the fin 21 of the front heat exchanger 20 Since the distance between the leading edge 23 and the leeward trailing edge 33 was equal, the upper end of the fin 21 of the front heat exchanger 20 and the upper end of the fin 41 of the rear heat exchanger 41 were Can be connected to one fin, and continuous press working can be performed with high productivity. Also, of the two areas sandwiched between the straight upwind front edge of the fin 21 of the front heat exchanger 20 and the straight downwind trailing edge, the area farther from the once-through blower 5; That is, the area between the windward leading edge 22 and the leeward trailing edge 32, and the straight portion of the windward leading edge 42 of the rear heat exchanger 40 and the straight portion of the leeward trailing edge 43. In the area sandwiched, three rows of heat transfer tubes 11a and 11b with an outer diameter in the range of 4 to 6.4 mm were arranged and the step pitch was set to 14.5 to 16 mm. Thus, a high air-side heat transfer coefficient can be obtained without excessively increasing the ventilation resistance, and a high heat exchange capacity can be exhibited by increasing the air volume at the same noise.

As the heat transfer tube 11 near the refrigerant outlet when the heat exchanger with fins 10 is used as a condenser or gas cooler, or as the heat transfer tube 11 near the refrigerant inlet when used as an evaporator. , 4 to 6.4 mm outside diameter of the heat transfer tubes 11a and 11b, the larger outer diameter of the heat transfer tube 11a is the most upstream of the gas flow in three rows. By arranging them in a row and using (forming) them in one pass, it is possible to improve the heat transfer coefficient in the pipe and to arrange them in a counter-current arrangement with respect to the temperature difference between air and refrigerant. Heat exchange capacity can be increased. In addition, since the refrigerant in this region has a high density, the flow resistance of the refrigerant does not significantly increase, and does not hinder an increase in heat exchange capacity. In addition, when the heat exchanger with fins 10 is used as a condenser or gas cooler with an outer diameter in the range of 4 to 6.4 mm, the heat transfer tube 11 a near the refrigerant outlet or the evaporator The heat transfer tube 11b with the smaller outer diameter than the heat transfer tube 11a near the refrigerant inlet when used as a heat exchanger, and the heat exchanger 10 with the fin as the condenser or gas cooler If used Heat transfer tube used in one pass near the refrigerant outlet in the 1st pass as a heat transfer tube on the upstream side of the refrigerant or 1 pass near the refrigerant inlet when the heat exchanger with fins 10 is used as an evaporator. Heat transfer tube used 1 1a Refrigerant from 1a • By using (forming) the heat transfer tube on the downstream side in 4 passes, the heat transfer capacity can be improved by achieving both low heat transfer coefficient in the tube and low refrigerant flow resistance. Can be increased.

In addition, of the two regions sandwiched between the straight windward leading edge and the straight leeward trailing edge of the fin 21 of the front-side heat exchanger 20, the region closer to the once-through blower 5, that is, the wind The region between the upper front edge 23 and the leeward rear edge 33 and the front heat exchanger 20 between the curved leeward front edge 24 and the curved leeward rear edge 3 4 As for the area, two rows of heat transfer tubes 11 c and lid with an outer diameter in the range of 6.5 to 8.5 mm were arranged and the stepwise pitch was set to 16 to 22 mm. Although the airflow resistance is slightly higher, a high air-side heat transfer coefficient can be obtained, and the difference in ventilation resistance of the heat exchanger as a whole can be reduced to improve the wind speed distribution. By improving the air volume of the air, excellent heat exchange capacity can be exhibited.

In addition, the heat transfer tube 1 1 inserted in the area of the front heat exchanger 20 between the curved upwind leading edge 24 of the fin 21 and the curved downwind trailing edge 34 The row pitch on the leeward side of the gas flow was set to be equal to or less than the row on the leeward side of the gas flow, so the number of heat transfer tubes 11 in the row direction was As much as possible, the ventilation resistance in this area can be increased, and thus the wind speed distribution of the finned heat exchanger 10 can be made more uniform, so that a larger heat Exchange ability can be demonstrated. In addition, when the heat exchanger with fins 10 is used as a condenser or a gas cooler, the heat transfer tube 11d near the refrigerant inlet or the heat transfer tube lid near the refrigerant outlet when used as an evaporator. Outside diameter of 6.5 to 8.5 mm and thicker than any of the other heat transfer tubes 11a, lib, 11c. Since it is arranged and used (formed) in two passes, it is possible to improve the performance due to the countercurrent arrangement with respect to the temperature difference between the air and the refrigerant, and the heat transfer coefficient in the pipe is slightly reduced, but the refrigerant flow The resistance can be greatly reduced, and thus the heat exchange capacity can be greatly increased. Furthermore, when the heat exchanger with fins 10 is used as a condenser or gas cooler with an outer diameter in the range of 6.5 to 8.5 mm, the heat transfer tubes 11 d or 1 d near the refrigerant inlet are used. The heat transfer tube 11c with the smaller outer diameter than the heat transfer tube 11d near the refrigerant outlet when used as an evaporator is used, and the heat exchanger 10 with the fin is used as a condenser or gas cooler. If used, use (form) the heat transfer tube 11 1d in the two passes with the largest outer diameter near the refrigerant outlet, or evaporate the heat exchanger 10 with the fin as the heat transfer tube downstream of the refrigerant. When used as a heat exchanger, it is used (formed) in the two passes with the largest outer diameter near the refrigerant outlet. By using two passes as the heat transfer tube on the upstream side of the coolant from the 1d heat transfer tube, The heat transfer rate can be improved to increase the heat exchange capacity.

In addition, the heat transfer tubes 11a, lib, 11c, 11d and the windward leading edges 22, 23, 24, 42 of the fins 21, 41, or the leeward trailing edges 32, 33 , 34, and 43 are at least 1.8 mm, so if the heat exchanger with fins 10 is used as the evaporator, it will adhere to the surfaces of the fins 21 and 41. Condensate flowing down is the heat transfer tube 1 1a, lib, 1 1c, 1 1 In the case of d, the fins 21, 41 jump out from the windward leading edge 22, 23, 24, 42 or the leeward trailing edge 32, 33, 34, 43. Can be suppressed.

When the dehumidifying operation is performed by using the heat exchanger with fins 10 divided into a reheater and an evaporator in the stage direction, the fins 21 in the bent front-side heat exchanger 20 are used. Of the two areas sandwiched by the straight leeward leading edge and the straight leeward trailing edge, the area farther from the once-through blower 5 is sandwiched by the windward leading edge 22 and the leeward trailing edge 32. Using the heat exchanger 40 as the reheater, the straight frontward edge of the fin 21 and the straight rearward edge of the fin 21 in the bent front heat exchanger 20 Of the two sandwiched areas, the area closer to the once-through blower 5, that is, the area sandwiched by the windward leading edge 23 and the leeward trailing edge 33, and the fin 21 in the front heat exchanger 20 By using the area sandwiched between the curved upwind leading edge 24 and the curved downwind trailing edge 34 as an evaporator, the heat load of the reheater and evaporator can be reduced. Can and this performing good dehumidifying operation by balance. In addition, since the reheater is located vertically above the evaporator, condensed water condensing on the fins in the area of the evaporator hits the fin surface of the reheater and re-evaporates. Humidification of the room can be prevented.

In addition, a plurality of cut-and-raised portions 141, 151, and 161 are provided on the surface of the fins 21 and 41 between the adjacent heat transfer tubes 11 in the stepwise direction and open in the main flow direction of the gas. , 142, 152, the leading edge effect of the thermal boundary layer provides a high air-side heat transfer coefficient, and these cuts 141, 151, 161, 1, 42, 15 2 heat transfer tube 1 1 rising part 14 1 a, 15 1 a, 16 1 a, 16 1 a, 14 2 a, 15 2 a formed in a direction roughly along the circumference of heat transfer tube 11 So that the air flow was Therefore, the effective heat transfer area increases, so that the heat exchange performance can be improved. In addition, the width W between the cut-and-raised portions 14 1, 15 1, 16 1, 14 2 and 15 2 in the column direction W sl, W s 2 The width W between the cut-and-raised portions in the column direction The ratio of b1, Wb2 Wb1 / Ws1, Wb2 / Ws2 is set to about 2 to about 2.5, which is higher than the conventional ratio of about 3. Heat exchange capacity can be improved.

In addition, the height of each cutout 14 1, 15 1, 16 1, 14 2, 15 2 is set to about 1 Z 4 of the pitch between adjacent fins 13 (2 1, 4 1). By setting it to about 3 Z4, the air volume at the same noise can be increased, and a greater heat exchange capacity can be exhibited.

In addition, the height of each of the cut-and-raised parts 14 1, 15 1, 16 1, 14 2, and 15 2 is set for the area G where the heat exchanger 10 with fins approaches the once-through blower 5 where the wind speed is high. Is about 1/2 of the pitch between adjacent fins 13 (2, 4 1) to make the ventilation resistance relatively large, and for other areas, the adjacent fins 13 (2 1, 4 1) By making the airflow resistance smaller as the pitch of about 3 Z4 between the two, the wind speed distribution of the heat exchanger 10 with fins can be made more uniform. Therefore, a greater heat exchange capacity can be exhibited.

In addition, the upwind leading edge 2 2, 2, 3, 24, 4 2 or leeward of each cutout 14 1, 15 1, 16 1, 14 2, 15 2 and fins 21, 4 1 Since the distance from the trailing edge 32, 33, 34, 43 was at least 1.8 mm, when the heat exchanger with fins 10 was used as the evaporator, the fins 21, 4 The condensed water adhering to the surface of (1) is cut and raised, and flows down along 4 1, 1 5 1, 1 6 1, 1 4 2 and 1 5 2 while windward of Fin 2 1 It is possible to suppress the phenomenon of jumping out of the leading edge 22, 23, 24, 42 or the leeward trailing edge 32, 33, 34, 43.

Also, if there is a temperature difference in the fluid flowing inside the two heat transfer tubes 11 adjacent in the column direction, the fins 21 and 1 at the center between the rows of the two heat transfer tubes 11 By providing the cuts 17 in the direction along the outline, heat exchange loss due to heat conduction through the fins 21 and 41 can be prevented, so that the heat exchange capacity is not reduced.

In addition, when the dehumidifying operation is performed using the heat exchanger with fins 10 divided into a reheater and an evaporator in the stage direction, the fins 2 between the reheater region and the evaporator region are used. 1 and 41 have a notch 19 that cuts almost completely, leaving only a small part 18 that does not cut, thereby preventing a significant decrease in capacity due to heat conduction of the fins 21 and 41 be able to. Furthermore, when the entire heat exchanger with fins 10 is used as an evaporator, the water condensing on the surfaces of the fins 21 and 41 does not stay in the cuts 19 and the fins 21 , 4 1 can flow down smoothly through a very small but connected part 18.

In addition, the use of one of HFC refrigerant, HC refrigerant and carbon dioxide having a low ozone depletion potential as the refrigerant fluid flowing inside the heat transfer tube 11 can contribute to the protection of the global environment. . In particular, since HC refrigerant and carbon dioxide are refrigerants having a low global warming potential, they can further contribute to the protection of the global environment.

In addition, continuous pressing was performed as a single fin 13 with the upper end of the fin 21 of the front heat exchanger 20 and the upper end of the fin 41 of the rear heat exchanger 40 connected. At the time of cooling, the direction perpendicular to the main gas flow direction of the fin collar 12 for inserting the heat transfer tube 11 later The stepwise pitch F of the fin collar at the adjacent portion at the boundary between the two fins 21 and 41 should be shorter than the pitch D of the other steps. As a result, the pitch F of the adjacent color at the boundary between the front heat exchanger 20 and the rear heat exchanger 40 was equal to the pitch D of the other neighboring steps. In comparison, the waste material 52 of the fin material can be reduced.

The method of manufacturing the heat exchanger with fins 10 includes a front heat exchanger 20 disposed on the front side of the housing 2 and a rear heat exchanger 20 disposed on the rear side of the housing 2. A method for manufacturing a heat exchanger with fins constituted by a heat exchanger and a heat exchanger with fins and a rear heat exchanger in a front heat exchanger. The fins 41 were pressed continuously as a single fin 13 with the upper end of the fin 41 connected at the boundary, and a number of these fins 13 were stacked and the heat transfer tube 11 was inserted. After expansion, the fins 13 are cut at the boundary between the front heat exchanger 20 and the rear heat exchanger 40, and then cut into the front heat exchanger 20 and the rear heat exchanger 40. Heat exchange with fins is more efficient than when the front heat exchanger 20 and the rear heat exchanger 40 are manufactured separately. It is possible to produce a 0. In addition, heat transfer tubes 11a, lib, llc, and lid with different diameters, different numbers of rows, different pitches in the row direction, and different pitches in the step direction may be mixed. For the cut-and-raised parts 14 1, 15 1, 16 1, 16 1, 14 2, and 15 2 formed on one fin 13, those with different shapes and heights should be mixed. Can be.

Also, the pitch F of the fin collars 12 adjacent to each other at the boundary between the front heat exchanger 20 and the rear heat exchanger 40 is set to Regarding the method of manufacturing the heat exchanger with fins 10 configured to be shorter than the pitch D, the upper end of the fin 21 in the front heat exchanger 20 and the heat exchanger in the rear heat exchanger 40 are described. In the step of the fin 13 connected to the upper end of the fin 4 1, which is perpendicular to the main flow direction of the gas of the fin collar 12 for inserting the heat transfer tube 11 later. Regarding the pitch, the pitch F of the fin collar 12 adjacent to the boundary between the front-side heat exchanger 20 and the rear-side heat exchanger 40 is larger than the pitch D of the other neighboring steps. After the fins 13 are formed short, a large number of these fins 13 are stacked, and the heat transfer tubes 11 are inserted and expanded, then the fins 13 are connected to the boundary between the front heat exchanger 20 and the rear heat exchanger 40. So that the front heat exchanger 20 and the rear heat exchanger 40 are separated. Therefore, the stepwise pitch F of the finkers 1 and 2 at an adjacent location at the boundary between the front heat exchanger 20 and the rear heat exchanger 40 is the same as the other stepwise pitches. Waste material 52 of fin material can be reduced as compared to the case where D is equivalent.

In the above embodiment, the case where the suction ports 3a and 3b are provided on the front surface, the upper surface, and the like has been described, but the present invention is not limited to this. Also, the case where the outlet 4 is provided on the lower surface side has been described. However, the present invention is not limited to this, and the above configuration can be applied to the outlet provided on the front surface or the like.

Further, in the above embodiment, the case where the front heat exchanger 20 and the rear heat exchanger 40 are arranged in the wind circuit from the suction ports 3a, 3b to the once-through blower 5 is described. Although described above, the present invention is not limited to this, and the above configuration can be applied to, for example, a heat exchanger provided in the wind circuit from the once-through blower 5 to the outlet 4. So In addition, the present invention can be applied to a case where three or more heat exchangers are provided in an indoor unit, or a case where only one heat exchanger is provided.

According to the above-described heat exchanger with fins according to the present embodiment, the heat exchanger with fins includes the front heat exchanger and the rear heat exchanger mounted on the indoor unit of the air conditioner. And the method of manufacturing the same, the leeward leading edge and the leeward trailing edge of the fin of the front heat exchanger connect two straight portions and the two straight lines, each forming the same obtuse angle. It is formed in a bent shape consisting of one curved part, and two areas sandwiched between the straight upwind front edge and the straight downwind edge of the fin in this bent front heat exchanger The distance between the leeward leading edge and the leeward trailing edge in the area closer to the once-through fan is shorter than the distance between the leeward leading edge and the leeward trailing edge in the area farther from the once-through fan, and the front side In the heat exchanger, the curved part of the leeward leading edge and the leeward trailing edge of the fin have the same shape. The leeward leading edge and the leeward trailing edge of the fin in the backside heat exchanger consist of parallel straight lines, and the distance between the finward leading edge and the leeward trailing edge of the fin in the rearward heat exchanger is Of the two areas sandwiched between the straight leeward leading edge of the fin and the straight leeward trailing edge of the bent front-side heat exchanger, the windward side of the area farther from the once-through blower By making the distance equal to the distance between the edge and the leeward trailing edge, the largest heat exchanger with fins can be stored in the limited space of the indoor unit of the air conditioner, especially in the space with a small depth, and the heat exchange capacity The water condensed on the surface of the fin when used as an evaporator can flow down smoothly along the fin, while significantly improving the water content. In addition, according to the method for manufacturing a heat exchanger with fins, the fins on the front heat exchanger and the fins on the back heat exchanger are continuously pressed as a single fin with a concave shape. Riff It can be manufactured efficiently and inexpensively without producing waste wood materials Industrial applicability

Thus, it relates to the improvement of the shape and size of the fins in the heat exchanger, and the improvement of the arrangement of the heat transfer tubes.It can be applied particularly to the indoor unit of an air conditioner and flows through the heat transfer tubes. The present invention can also be applied to a device that performs heat exchange between a refrigerant and air flowing outside.

Claims

The scope of the claims

1. Installed in the indoor unit of an air conditioner with a wind circuit composed of a housing with an inlet on the front side and an outlet on the lower side, and a once-through blower housed in this housing Heat exchanger with fins

A front-side heat exchanger and a rear-side heat exchanger arranged in the wind circuit from the suction port to the once-through blower or in the wind circuit from the once-through blower to the outlet.

The fins in the front-side heat exchanger are defined by two straight portions whose upwind leading edge and leeward trailing edge make the same obtuse angle, and one curved portion connecting these two straight lines. Of the two fins formed between the straight leeward leading edge and the linear leeward trailing edge of the bent fin, which are closer to the once-through blower. The distance between the windward leading edge and the leeward trailing edge in the area on the side is shorter than the distance between the windward leading edge and the leeward trailing edge in the area farther from the once-through blower. Heat exchanger.

2.The distance between the leeward leading edge and the leeward trailing edge in the area near the once-through fan is set to 20 to 23 mm, and the leeward leading edge and the leeward trailing edge in the area farther from the once-through fan. The heat exchanger with fins according to claim 1, wherein the distance between the fins is 24 to 27 mm.

3. The heat exchanger with fins according to claim 1, wherein the fins on the windward leading edge side and the leeward trailing edge side of the front side heat exchanger have the same shape.

4. The heat exchanger with fins according to claim 1, wherein a curved portion of the fin in the front-side heat exchanger has an arc shape.

5. The leeward leading edge and the leeward trailing edge of the fin in the rear side heat exchanger are composed of straight lines that are parallel to each other, and the distance between the leeward leading edge and the leeward trailing edge of the fin is set to the front side. Of the two regions between the straight leeward leading edge of the fin and the straight leeward trailing edge of the heat exchanger, the leeward leading edge and the leeward trailing edge in the region farther from the once-through blower The heat exchanger with fins according to claim 1, wherein the distance is equal to the distance.

6. Of the two areas between the straight leeward leading edge and the straight leeward trailing edge of the fin in the front-side heat exchanger, the fin is inserted into the fin in the area farther from the once-through blower. The outer diameter of the heat transfer tube inserted between the straight part of the leeward leading edge and the straight part of the leeward trailing edge of the fin in the heat transfer tube and the rear heat exchanger is 4 to 6.4 mm. In addition, the heat transfer tubes are arranged in three rows in the row direction along the main flow direction of the gas, and the arrangement pitch of the heat transfer tubes in the step direction that is perpendicular to the main flow direction of the gas is set to 14.5 to 16 mm. The heat exchanger with fins according to claim 1, wherein

7. Of the two areas between the straight leeward leading edge of the fin and the straight leeward trailing edge of the fin in the front-side heat exchanger, the fin is inserted into the fin in the area farther from the once-through blower. The heat transfer tube inserted between the straight section of the windward leading edge of the fin and the straight section of the leeward trailing edge of the fin in the rear heat exchanger consists of two types of outer diameter heat transfer tubes. And

In addition, heat transfer tubes with the larger outer diameter are placed in the most upstream row of the gas flow, and the heat transfer tubes near the refrigerant outlet when the finned heat exchanger is used as a condenser or gas cooler. When using a heat exchanger with a fin as a condenser or gas cooler, use one pass as the heat transfer tube near the refrigerant inlet when using it as an evaporator. When used as a heat transfer tube upstream of the heat transfer tube having the larger outer diameter, or as a heat transfer tube downstream of the heat transfer tube having the larger outer diameter, 7. The heat exchanger with fins according to claim 6, wherein the refrigerant is flowed using four passes.

8. In the front heat exchanger, the fin is inserted into the fin of the area closer to the once-through blower, between the two areas between the straight upwind front edge and the straight downwind rear edge of the fin. The outer diameter of the heat transfer tube and that of the heat transfer tube inserted in the area between the curved upwind leading edge and the curved downwind trailing edge of the fin are 6.5 to 8.5 mm, respectively. The heat transfer tubes are arranged in two rows in a row direction along the main flow direction of the gas, and an arrangement pitch of the heat transfer tubes in a step direction perpendicular to the main flow direction of the gas is 16 to 22. 2.The heat exchanger with fins according to claim 1, wherein

9. Regarding the step-wise pitch of the heat transfer tubes inserted in the area between the curved frontward edge of the fin and the rearward curved edge of the fin in the front-side heat exchanger, 9. The heat exchanger with fins according to claim 8, wherein a row on the leeward side of the flow is equal to or less than a row on the leeward side.

10 .In the front heat exchanger, the fin in the area closer to the once-through blower in the two areas between the straight windward leading edge and the straight leeward trailing edge of the fin, The heat transfer tubes inserted into the area between the curved leeward leading edge of the fin and the curved leeward trailing edge consist of two types of outer diameter heat transfer tubes.

The heat transfer tubes having the larger outer diameter are arranged in the most leeward row of the gas flow, and near the refrigerant inlet when the heat exchanger with fins is used as a condenser or a gas cylinder. When used as a heat transfer tube, or as a heat transfer tube near the refrigerant outlet when used as an evaporator,

When using the heat exchanger with a fin as a condenser or a gas cooler for the heat transfer tube having a smaller outer diameter, the heat transfer tube downstream of the heat transfer tube having a larger outer diameter is used as the heat exchanger. When used as a heat tube or as an evaporator, the refrigerant flows using two paths as the heat transfer tube upstream of the heat transfer tube having the larger outer diameter, respectively. A heat exchanger with fins according to clause 8 or 9.

1 1. The shortest distance between the heat transfer tube and the leading or trailing edge of the fin

The heat exchanger with a fin according to claim 1, wherein the heat exchanger has a length of 1.8 mm or more.

1 2. When dehumidifying operation is performed by using the reheater and evaporator separately in the stage direction, the straight frontward edge of the fin and the straight rearward edge of the fin of the front heat exchanger Of the two areas sandwiched, the area farther from the once-through blower and the rear heat exchanger are used as reheaters,

Of the two areas between the straight leeward leading edge of the fin and the straight leeward rear of the fin in the front-side heat exchanger, the area closer to the once-through blower and the curved fin of the fin 2. The heat exchanger with fins according to claim 1, wherein an area sandwiched between a windward leading edge and a curved leeward trailing edge is used as an evaporator.

1 3. A plurality of cut-and-raised portions that open in the main flow direction of gas are provided on the fin surface between the heat transfer tubes that are adjacent in the step direction.

The rising portions of the cut-and-raised portions near the heat transfer tube are formed in a direction substantially along the circumference of the heat transfer tube, and the ratio of the width between the cut-and-raised portions in the column direction to the width of the cut-and-raised portions in the column direction is determined. The heat exchanger with fins according to claim 1, wherein the heat exchanger has a diameter of about 2 to about 2.5.

14. The heat exchanger with fins according to claim 13, wherein the height of the cut-and-raised portion is about / to about 3 Z4 of the pitch between adjacent fins.

15 5. In the region where the wind speed is high where the heat exchanger with fins approaches the once-through blower is about 1 Z2 of the pitch between adjacent fins, and The heat exchanger with fins according to claim 13 or 14, wherein the area is set to about / of the pitch between adjacent fins.

16. The heat exchanger with fins according to claim 13, wherein the shortest distance between the cut-and-raised edge and the leeward leading edge or the leeward trailing edge of the fin is set to 1.8 mm or more. .

1 7-If there is a temperature difference between the refrigerant flowing inside between two heat transfer tubes adjacent in the row direction, a direction generally along the step direction is applied to the central fin between the two heat transfer tubes. The heat exchanger with fins according to claim 1, characterized in that a notch is provided.

1 8. When dehumidifying operation is performed by using the reheater and evaporator separately in the stage direction, only a small part of the fin between the reheater area and the evaporator area is not cut. The heat exchanger with fins according to claim 1, characterized in that a notch for cutting and leaving the heat exchanger is provided.

19. The heat exchanger with fins according to claim 1, wherein any one of an HFC refrigerant, an HC refrigerant, and carbon dioxide is used as the refrigerant flowing inside the heat transfer tube. 20. At the upper end of the fin and the rear heat exchanger in the front heat exchanger The heat exchanger with fins according to claim 1, wherein the heat exchanger with the fins is manufactured in a state in which the upper end of the fins is bent.

A gasket of a fin collar for inserting a heat transfer tube formed in a fin in a state where the upper end of the fin in the front heat exchanger and the upper end of the fin in the rear heat exchanger are connected. Regarding the pitch in the step direction that is perpendicular to the main flow direction,

The arrangement pitch of the fin collars at a location adjacent to the boundary between the front-side heat exchanger and the rear-side heat exchanger is shorter than the arrangement pitch in other stage directions. Heat exchanger with fins.

21. The method for producing a finned heat exchanger according to claim 1, comprising a front heat exchanger and a rear heat exchanger.

The upper end of the fin in the front heat exchanger and the upper end of the fin in the rear heat exchanger are continuously pressed as one fin in a state where the fin is connected at the boundary. After laminating a large number of fins,

Next, each of the fins is cut at a boundary between the front-side heat exchanger and the rear-side heat exchanger, and separated into the front-side heat exchanger and the rear-side heat exchanger. Of heat exchanger with fins.

22. The method for manufacturing a finned heat exchanger according to claim 20, comprising a front-side heat exchanger and a rear-side heat exchanger.

When performing continuous press working as a single fin with the upper end of the fin in the front heat exchanger and the upper end of the fin in the back heat exchanger separated at the boundary. , The pitch of the fin collars for inserting the heat transfer tubes is smaller than the pitches of the other tiers in the portions adjacent to the fin collars formed on the front-side heat exchanger and the rear-side heat exchanger, respectively. After laminating a number of fins that are formed short, heat exchanger tubes are passed through each

Next, a method of manufacturing a heat exchanger with fins, comprising separating the fins into the front side heat exchanger and the back side heat exchanger.