JPH07260178A - Air conditioner - Google Patents

Abstract

PURPOSE:To promote a silent operation and improve a heat exchanging efficiency by a method wherein a side end of a heat radiation fin constituting a heat exchanger is provided with a plurality of slits or recesses and heat radiation fins are bent and formed at the same angle to each other along these slits or recesses. CONSTITUTION:An upper part (a rear surfaces side heat exchanger 5B) of slits 20 is bent with a lower part (a front side heat exchanger 5A) under a bending work along the slits 20 so as to form a heat exchanger 5 divided into a V-shaped segment. Then, the front side heat exchanger 5A is bent and formed along a plurality of recesses 21 at an inner part. In addition, in view of the configuration of the recesses 21, the relative heat exchanger portions constituting the front side heat exchanger 5A are bent at the same angle DELTA. With such an arrangement as above, it is possible to prevent disturbance of heat exchanging air passing through the heat exchanger 5, promote a silent operation and improve a heat exchanging efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner which constitutes, for example, an indoor unit, and more particularly to an improvement in heat exchanger structure.

[0002]

2. Description of the Related Art A commonly used air conditioner comprises an indoor unit arranged in an air-conditioned room and an outdoor unit arranged outdoors, and these units are connected by a refrigerant pipe and electric wiring. .

From the user side, there is a great demand for miniaturization of these units and reduction of the installation space, and each maker must increase the heat exchange capacity while satisfying such conditions.

As one of the solutions, in recent years, especially in indoor units, the heat exchangers provided here are bent and formed in a "dogleg" shape to secure a heat exchange area and heat exchange. The height of the container itself is suppressed and the height of the unit body is reduced.

By the way, in the indoor unit, the air to be conditioned room is sucked into the main body of the unit, the heat exchanger is conducted to perform the heat exchange action, and the air after the heat exchange is blown again to the room to be conditioned. There is a fan, and due to its performance,
A transverse fan is adopted.

This cross-flow fan has an axial length substantially the same as the width dimension of the heat exchanger, and extends along the peripheral edges of both side end plates made of circular plates and partition plates having a predetermined interval.
A large number of blades (blades) are provided at a predetermined interval and have a substantially circular cross section.

In order to reduce the size of the unit body, the diameter of the cross flow fan is set to the minimum dimension that secures the required air flow. In the case of the dogleg-shaped heat exchanger, a cross-flow fan is arranged on the rear side of the bent portion, but depending on the position setting of this bent portion, at least one of the upper end and the lower end of the heat exchanger is at one end. Since the part is far away from the cross flow fan, heat exchange air is difficult to be guided, and a difference occurs in heat exchange efficiency partially.

[0008]

Therefore, for example, Japanese Utility Model Laid-Open No. 4-57073 has been disclosed as an improved shape structure of the doglegged heat exchanger. With such a heat exchanger, compared to a simple doglegged heat exchanger,
It is possible to improve the cooling capacity and the heating capacity by increasing the heat exchange area and the amount of ventilation to the heat exchanger without increasing the height dimension.

However, in this heat exchanger, when heat exchange air passes through each bent portion, turbulence of ventilation is likely to occur. Then, in the front surface portion of the heat exchanger corresponding to the front suction port having the largest intake air volume, the distance between the rear surface side and the fan peripheral surface is greatly different in each portion.

As a result, in the portion corresponding to the front suction port, the suction pressure of the heat exchange air tends to vary, so that the suction air volume is not constant. There is a so-called rustling noise as the blowing sound of the fan, which impairs quiet operation. Furthermore, since the air volume is not constant, the heat exchange efficiency is only slightly improved, and further improvement is desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent turbulence of heat exchange air passing through a heat exchanger and to maximize the distance between the heat exchanger and the blower fan. And the minimum distance are further shortened to reduce the suction pressure difference, to promote the quiet operation that reduces the blast noise, and to provide the air conditioner that improves the heat exchange efficiency. Is.

[0012]

In order to satisfy the above object, in the air conditioner of the present invention, in claim 1, a large number of heat radiating fins are arranged in parallel with each other with a narrow gap therebetween. The heat exchanger comprises a heat exchanger having a heat exchange pipe penetrating therethrough and a blower fan having a circular cross section for guiding the air in the air-conditioned room to the heat exchanger for heat exchange. The radiating fin is characterized in that a plurality of cutouts or cutouts are provided at its side ends, and the heat radiation fins are bent at the same angle along the cutouts or cutouts.

According to a second aspect, a part of the peripheral surface of the blower fan according to the first aspect is surrounded by the heat exchanger formed by bending at the same angle, and the heat exchange pipe constituting the heat exchanger is The heat-radiating fins of the heat-radiating fins are fitted into the mounting holes that are arranged in two rows, the heat-exchanger air-outlet side being the blower fan side. The open ends of the heat exchange pipes located at are connected to each other by U-bends, and the open ends connected by the U-bends are either one of the inlet side row or the outlet row of the heat exchange air. Is characterized by.

According to a third aspect of the present invention, in the blower fan according to the first aspect, a plurality of vanes are arranged along a circular peripheral edge at a predetermined interval, and the vanes are advanced in the axial rotation direction. It is characterized by being twisted to have.

[0015]

Since the heat exchanger is bent at the same angle at the notch or notch so as to surround the blower fan, the heat exchange air is less disturbed at the bent portion of the heat exchanger, and the blower fan is reduced. The distance from the peripheral surface is almost the same in each part, the suction pressure and the suction air volume are constant, and the unevenness of the heat exchange efficiency is small.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an indoor unit of the air conditioner is configured. Unit body 1 which is the air conditioner body
A front suction port 2a is opened on the front side of the grill, and a grill 3a is fitted therein. On the other hand, the upper suction port 2b is also opened on the upper surface side of the unit body 1, and the grill 3b is also provided here.
Is fitted.

An outlet 4 is provided from the front surface of the unit main body 1 to the lower portion. An air filter (not shown) and a molded heat exchanger 5 (described later) are arranged so as to face the front part, which is the upper part of the outlet 4, and the upper intakes 2a and 2b.

Next, the heat exchanger 5 will be described in detail. As shown in FIGS. 2A and 2B, the heat exchanger 5 is
In the figure, a large number of radiating fins 12 are formed in a straight shape having a predetermined width in the left-right direction and long in the up-down direction, and are arranged side by side with a narrow gap in the direction of the paper surface. The heat exchange pipes 13 are inserted into and fitted into the mounting holes 22 that are vertically displaced from each other.

The radiating fin 12 is preliminarily formed by press punching, and at a predetermined position of the upper portion A in the drawing, a V-shaped cut portion 20 is provided horizontally from one side edge 12a thereof and from a middle portion. And is extended to the front side of the other side edge 12b.

That is, the portion between the tip of the cut portion 20 and the inner edge 12b of the radiation fin 12 is left as the first connection portion 15. A plurality of notches 21 are provided at a predetermined interval from the notch 20 to the lower edge. The cutout portion 21 includes an upper side portion 21a and a lower side portion 21b.
And each side portion is formed by bending at least a plurality of straight lines in different directions in a zigzag shape, and is bent and deformed as a whole to form a triangular shape.

The tip of the cutout portion 21 extends slightly to the front side of the one side edge 12a, and a second connection is made between the tip of the cutout portion 21 and the one side edge 12a of the heat radiation fin 12. It is left as part 16.

Further, a connecting portion 17 is integrally formed in the middle of the cutout portion 21. These connecting parts 17
Is an upper side portion 21a and a lower side portion 21b forming the cutout portion 21.
Is a narrow side part that connects the middle part of the
It is provided in a state of being inclined at a predetermined angle with respect to the inner and outer edges 12a and 12b.

Then, as shown in FIG. 2C, a substantially middle portion of the connecting portion 17 is formed in advance in a triangular shape in cross section so as to project in a predetermined plane direction, and folds are formed at a top portion and a base end portion thereof. 18 is formed.

These folds 18 are provided so that when the radiation fin 12 is partially bent, as will be described later, all the joint portions 17 themselves project in the same direction and are folded.

Each mounting hole 2 except between the mounting holes 22 on the upper and lower sides through the notch 20 and between the mounting holes 22 on both the upper and lower sides through the cutout 21.
A rising slit portion 24 is provided between the two.

These rising slits 24 are rising pieces formed by cutting and raising integrally on both sides of the heat radiating fins 12 in the vertical direction, and are efficient for heat exchange air guided along both sides of the fins. You can contact them.

A U-shaped bent heat exchange pipe 13 is penetrated through the mounting holes 22 in the right and left rows of the radiating fins 12, and a fitting state of the radiating fins 12 can be obtained by the pipe expanding means.

To explain further, the heat exchange pipe 13 bent in the U shape is between the upper end portion of the heat radiation fin 12 and the cut portion 20 as shown by a two-dot chain line in FIG. And between the cutouts 20 and the uppermost cutouts 21, between the respective cutouts 21 and between the lowermost cutouts 21 and the lowermost portions of the fins 12, between the mounting holes 22 in the left and right rows. Penetrated, never notch 20 and notch 2
Not through 1.

In this state, the flat plate heat exchanger is molded, and here the notch 20 and the notch 21 are formed.
A bending process is performed on the. In each case, each portion is bent inward by applying a biasing force from one side edge 12a of the heat radiation fin 12 toward the other side edge 12b.

As shown in FIG. 3, by bending along the notch 20, the upper part and the lower part of the notch are bent to form an inverted V shape, which is divided into two parts. The heat exchanger is

Here, since the heat exchanger portion on the upper side of the cut portion 20 is bent and formed on the rear surface side of the unit main body 1, it is referred to as a rear surface side heat exchanger 5B, and the heat exchanger portion on the lower side of the cut portion 20 is formed. Since the heat exchanger portion is bent and formed on the front side of the unit body 1, it is referred to as a front side heat exchanger 5A.

Further, the front side heat exchanger 5A is bent along the plurality of notches 21. That is, the upper side portion 21a and the lower side portion 21b forming the cutout portion 21
The notch 2 is formed by bending so that
1. The upper and lower heat exchanger parts are bent inward.

In addition, because of the structure of the notch 21, the heat exchanger parts constituting the front side heat exchanger 5A are all bent at the same angle θ °. Finally, U bends 17 to 19, which will be described later, are connected to the open ends of the adjacent heat exchange pipes 13.

That is, in the front side heat exchanger 5A, from the position of the heat exchange pipe 13 provided first, the two types of U bends 17 and 18 are arranged on the side edge 12a side row which is the introduction row side of the heat exchange air. And the other side edge 12b side row which is the lead-out side, are provided in parallel to the left and right two rows.

The U-bend 17 connecting the open ends of the heat exchange pipes 13 on the side row of the one side edge 12a has no change in the distance between the heat exchange pipes before and after the bending of the heat exchanger. Therefore, the so-called regular type U-bend 17 which is conventionally used is used.

On the other hand, the U-bend 18 connecting the open ends of the heat exchange pipes on the side of the other side edge 12b is hatched in the drawing, and the U-bends 18 of the heat exchange pipes 13 after being bent at the notches 21. Is molded according to
And connected.

That is, these U bends 18 are provided through the bent notches 21. On the other hand, by setting the bending angle θ °, the distance between the open ends of the heat exchange pipe 13 on both sides of the notch is also set.

Therefore, with the bending angle adjusted,
The U bends 18 in this row will be molded and connected. The U-bends 19 in this row, which are connected via the notches 20 are also shaped and connected in the same manner as the bending angle.

In the rear side heat exchanger 5B, the dimension between the heat exchange pipes 13 does not change irrespective of before and after the bending process due to its configuration, so a regular type U bend is used for each row. To be

Therefore, in the inverted V-shaped heat exchanger thus formed, one system of flow passage is formed across each heat exchange pipe 13 and each U bend 17 to 19. End plates (not shown) are attached to both ends of the heat exchanger 5, and the heat exchanger 5 is arranged at a predetermined position in the unit body 1 by the end plates.

Then, as shown in FIG. 1 again, a front drain pan 6a is disposed at the lower end of the front heat exchanger 5A,
A rear drain pan 6b is arranged at the lower end of the rear heat exchanger 5B.

The drain pans 6a and 6b are communicated with each other through a communication passage (not shown), and the drain water collected by the rear drain pan 6b passes through the communication passage and the front drain pan 6a.
It is supposed to flow to.

A cross-flow fan 7, which is a blower fan that constitutes an indoor blower, is arranged at the back side portion of the front side heat exchanger 5A. The cross-flow fan 7 is provided with a large number of blade plates (blades) 8 at predetermined intervals and has a circular cross section as a whole.

To explain further, as shown in FIG. 4, the vane plates 8 constituting the cross flow fan 7 are provided between the partition plates 9 provided at predetermined intervals in the axial direction. A so-called skew type cross-flow fan, which is twisted so as to have an advancing angle in the axial rotation direction, rather than being simply linear, is adopted.

As shown in FIG. 1 again, the cross-flow fan 7 thus constructed is located on the back side of the front side heat exchanger 5A, and the front side heat exchanger surrounds a part of the peripheral surface. Be bent.

The distance between the rear side edge of the front side heat exchanger 5A and the peripheral surface of the cross-flow fan 7 is gradually closer to each other and gradually separated from each other.
It is extremely smaller than that of the technology disclosed in Japanese Patent Laid-Open No. 57073).

The upper part of the cross-flow fan 7 faces the front side heat exchanger 5A and the rear-side heat exchanger 5B which are bent and formed in the reverse V shape, and the cross-flow fan 7 looks like an umbrella. It is covered like.

A fan casing 10 is provided from the lower part of the rear drain pan 6b through the side of the cross flow fan 7 to the outlet 4. The side portion of the rear drain pan 6b which is a part of the casing 10 serves as a back nose.

The outer bottom surface of the front drain pan 6a is
It also serves as the front nose of the cross flow fan 7, and also serves as the upper part of the blowout passage of the blowout port 4 that opens to the lower portion on the front side of the unit body 1.

Thus, for example, heating operation is performed. The compressor of the outdoor unit (not shown) is driven to perform the refrigeration cycle operation, and the cross flow fan 7 in the indoor unit is driven. The high-temperature and high-pressure refrigerant discharged from the compressor is guided to the heat exchanger 5 as a condenser.

The heat exchange air, which is the air to be conditioned in the room, is introduced from the front suction port 2a and the upper suction port 2b and guided to the heat exchanger 5 through the filter. That is, the radiating fins 1 are connected to each other through the gaps between the radiating fins 12 from the one side edge 12a of the front heat exchanger 5A and the rear heat exchanger 5B.
After coming into contact with 2 and the heat exchange pipe 13, it is led out from the other side edge 12b.

The refrigerant is guided to the heat exchanger 5 and releases the heat of condensation while being conducted to the flow path formed by the heat exchange pipe 13 and the U bends 17 to 19, and transfers the heat to the radiating fins 12. Heat exchange air is conducted between these radiating fins 12 to perform heat exchange.

The heat-exchanged air absorbs heat, rises in temperature, is led out from the front and rear heat exchangers 5A, 5B, and is blown from the outlet 4 to the air-conditioned room through the crossflow fan 7 to perform a heating action. In particular, since the heat exchanger 5 has an inverted V shape with the front side heat exchanger 5A and the rear side heat exchanger 5B, the height dimension of the heat exchanger 5 as well as the unit main body 1 can be small, and the heat exchanger 5 can be installed. Contributes to space reduction.

By forming the bent portion of the front side heat exchanger 5A at a plurality of places, the heat exchanger 5A almost flexes a part of the peripheral surface of the cross flow fan 7, and the suction air volume of the most suction air amount is increased. Many differences in the distance between the heat exchanger 5A and the cross-flow fan become extremely small in each part.

Therefore, the suction pressure and the suction air volume of the heat exchange air become constant, the blowing noise is reduced, and the heat exchange efficiency is improved. Further, since the notches 21 of the front side heat exchanger 5A have the same shape and are bent at the same angle θ ° at the notches 21, the ventilation resistances of the heat exchange air passing through the respective bent portions are mutually different. Since they are the same and the suction pressure and the suction air volume of the heat exchange air are equal to each other, it is possible to further reduce the blowing noise and improve the heat exchange efficiency.

Further, if the ventilation resistances of the respective bent portions and the rising slit portions 24 adjacent thereto are set to be the same, the ventilation resistance of the entire front side heat exchanger 5A will be the same, and therefore the blowing noise will be further increased. And the heat exchange efficiency is improved.

On the other hand, the cross flow fan 7 is of a skew type in which the blade plate 8 has a forward angle with respect to the axial rotation direction. As shown in FIG. 5, the heat exchange air passing through the front-side heat exchanger 5A and the rear-side heat exchanger 5B has a small wind speed as indicated by the one-dot chain line in the figure due to the configuration of each heat exchanger. Some bent parts alternate with other parts where the wind speed is high,
Airflow turbulence occurs at the bent portion.

Since the bent portion of the front side heat exchanger 5A is formed along the axial direction of the cross flow fan 7,
The turbulence of the flow of heat exchange air passing through this bent portion is
It flows into the cross flow fan 7 in the same phase.

On the other hand, the cross-flow fan 7 is a skew type in which the blade plate 8 has an advancing angle with respect to the axial rotation direction, so that the individual blades are affected by the turbulence of the flow of heat exchange air flowing in the same phase. The phase of the plate 8 will shift.

Therefore, even if the turbulence of the flow of the heat exchange air is introduced along the axial direction with respect to the cross flow fan 7, this phase shift disperses the generation of fluid noise due to the turbulence of the flow of the heat exchange air, It has the effect of suppressing the blowing noise and enables quiet operation.

Since the bending angle θ ° is set to be the same in the front side heat exchanger 5A, the same jig can be used for all the bent parts when molding this heat exchanger. Good manufacturability.

The U-bend 18 connected through the bent notch 21 as well as the other U-bends 17 can be shared with each other, and the manufacturing cost is not adversely affected. The part where each of the U-bends 17 to 19 is used is clear, the confirmation at the time of connection is easy, there is no erroneous work, and the workability is improved.

In the above embodiment, the front side heat exchanger 5A is provided with a plurality of cutouts 21 in the radiating fins 12 and is bent. However, the invention is not limited to this, and a plurality of cutouts are provided. Alternatively, they may be bent at the same angle.

Further, the cutout portion and the cutout portion 21.
Also, contrary to the above embodiment, the one side edge 12a to the other side edge 1
It may be provided in 2b. In this case, in the bent front-side heat exchanger 5A, the inlet side of the heat exchange air is expanded and the outlet side is slightly left to form a triangular space portion in a side view, but the air flow is disturbed. In terms of reduction of sound to be sent, common use of U-bend, improvement of manufacturability and workability, etc., it is comparable to that of the embodiment described above.

Further, the present invention is not limited to the structure of the above embodiment, and it is needless to say that various modifications can be made without departing from the scope of the present invention. Further, in the above embodiment, the front side heat exchanger 5A and the rear side heat exchanger 5B are formed by bending a single fin, but the front side heat exchanger 5A and the rear side heat exchanger 5B are individually formed. Formed,
It may be arranged in an inverted V shape.

[0066]

As described above, according to the present invention, in claim 1, a plurality of cutouts or cutouts are provided at the side ends of the radiation fins constituting the heat exchanger, and the cutouts or cutouts are provided. Since they are bent at the same angle along each other, the same jig can be used for all bent parts, which can improve the productivity and also the turbulence of the heat exchange air passing through the heat exchanger. To prevent the generation of blowing noise, and to shorten the difference between the maximum distance and the minimum distance between the heat exchanger and the blower fan to reduce the suction pressure difference, to achieve quiet operation and improve heat exchange efficiency. And other effects.

In claim 2, a part of the peripheral surface of the blower fan is
The opening ends of the heat exchange pipes which are surrounded by the heat exchanger and are located on both sides of the bent portions through the bent portions, and either the introduction side row or the derivation row of the heat exchange air are connected to each other by U bends. As a result, the U-bends on the bent parts of the heat exchanger are standardized, the manufacturing cost is not adversely affected, and the mounting parts of these U-bends are clarified, which improves workability. Play.

According to a third aspect of the present invention, in the blower fan, a plurality of blades are arranged at a predetermined interval along a circular peripheral edge, and the blades are twisted so as to have a forward angle in the axial rotation direction. Because I adopted the Iwayu skew type cross-flow fan,
It is possible to disperse the generation of fluid noise due to the turbulence of the heat exchange air flow guided through the bent portion of the heat exchanger, to effectively blow air, and thus to contribute to the improvement of heat exchange efficiency.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an air conditioner indoor unit showing an embodiment of the present invention.

FIG. 2A is a front view of a radiation fin of the same embodiment.
FIG. 6B is an enlarged view of a part of the heat radiation fin. (C) is
FIG. 3 is a vertical cross-sectional view of a radiation fin joint portion.

FIG. 3 is a side view of the heat exchanger according to the embodiment.

FIG. 4 is a partial perspective view of the cross flow fan of the embodiment.

FIG. 5 is an explanatory view of a flow state of heat exchange air passing through the heat exchanger according to the embodiment.

[Explanation of symbols]

12 ... Radiating fins, 13 ... Heat exchange pipe, 5 ... Heat exchanger, 7 ... Blower fan (cross flow fan), 8 ... Blade plate, 21
… Notches, 17, 18… U bend.

Claims (3)

[Claims] 1. A heat exchanger in which a large number of radiating fins are arranged side by side with a narrow gap between each other, and a heat exchange pipe penetrates through these radiating fins, and air to be conditioned in the air is guided to the heat exchanger. In an air conditioner provided with a blower fan having a circular cross section for performing heat exchange, the heat radiating fins forming the heat exchanger are provided with a plurality of notches or notches at side ends thereof. An air conditioner characterized in that the air conditioners are bent and formed at the same angle along each of the portions or the notches. 2. A part of the peripheral surface of the blower fan is surrounded by the heat exchanger bent at the same angle, and the heat exchange pipe constituting the heat exchanger has a heat exchange air introduction of a heat radiation fin. Side and the heat exchange air outlet side, which is the blower fan side, are fitted into the mounting holes arranged in two rows in parallel, and the heat exchange pipes located on both sides of the heat exchange pipe through the bent portions of the heat exchanger. 2. The opening ends are connected to each other by U-bends, and the opening ends connected by the U-bends are either one of an introduction side row and a derivation row of heat exchange air. Air conditioner described. 3. The fan according to claim 3, wherein a plurality of blades are arranged along a peripheral edge at a predetermined interval, and the blades are twisted so as to have an advancing angle in the axial rotation direction. The air conditioner according to claim 1, which is characterized in that.