KR20190096170A - Heat exchanger for refrigerator - Google Patents

Abstract

According to the present invention, a heat exchanger of a refrigerator comprises: a first heat exchange unit in which a flow path through which a refrigerant flows is formed, and which includes a plurality of vertically stacked flat tubes and a fin connecting the flat tubes to each other; and a second heat exchange unit in which the flow path through which the refrigerant flows is formed, which includes a plurality of vertically stacked flat tubes and a fin connecting the flat tubes to each other, and which is arranged behind the first heat exchange unit. Fin density of the second heat exchange unit is lower than fin density of the first heat exchange unit, and the first heat exchange unit overlaps with the second heat exchange unit. The flat tubes of the first heat exchange unit are disposed in parallel with left and right directions, and the flat tubes of the second heat exchange unit further include a bending portion bent at a predetermined curvature.

Description

Heat exchanger for refrigerator

The present invention relates to a heat exchanger of a refrigerator.

In general, the heat exchanger may be used as a condenser or evaporator in a refrigeration cycle device consisting of a compressor, a condenser, an expansion device, and an evaporator.

In addition, the heat exchanger is installed in a vehicle, a refrigerator, etc. to exchange the refrigerant with air.

The heat exchanger may be classified into a fin tube type heat exchanger and a micro channel heat exchanger according to the structure.

Finned tube heat exchangers are made of copper, and micro-channel heat exchangers are made of aluminum.

The micro channel type heat exchanger has a good efficiency compared to the fin tube type heat exchanger because a fine flow path is formed therein.

The heat exchanger of the refrigerator according to the prior art is to be arranged inside the machine room of the refrigerator, the height of the machine room is very limited, there is a limit to the performance of a large heat exchanger.

In addition, there is a problem that it is difficult to configure a heat exchanger having high heat exchange performance in a multi-row structure within a limited height of the refrigerator machine room.

The problem to be solved by the present invention is to provide a heat exchanger of a refrigerator which is efficiently arranged in a machine room of a refrigerator whose height is limited and has excellent heat exchange performance.

Another object of the present invention is to provide a heat exchanger of a refrigerator having a plurality of rows and sharing a header, thereby reducing manufacturing costs.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In the heat exchanger of the refrigerator according to the present invention, a flow path through which a refrigerant flows is formed, and a first heat exchanger includes a plurality of flat tubes stacked vertically and fins connecting the plurality of flat tubes, and a refrigerant flows therein. A flow path is formed, and includes a plurality of flat tubes stacked vertically and a fin connecting the plurality of flat tubes, and a second heat exchanger disposed behind the first heat exchanger. The fin density is lower than the peel density of the first heat exchanger, the first heat exchanger is disposed to overlap with the second heat exchanger, and the fin density of the second heat exchanger is lower than the peel density of the first heat exchanger, The heat exchanger is disposed to overlap with the second heat exchanger, and the flat tubes of the first heat exchanger are disposed parallel to the left and right directions. The flat tubes of the second heat exchanger may further include a bending portion bent at a predetermined curvature.

The heat exchanger of the refrigerator of the present invention has one or more of the following effects.

First, while arranging the heat exchanger of the heat exchanger in multiple rows, one is formed in a flat shape, the other is formed in a U-shape, while maximizing space utilization, it is possible to improve the heat exchange efficiency.

Secondly, the volume of the U-shaped heat exchanger is made larger at the same height and width than the volume of the planar heat exchanger, lowers the fin density of the U-shaped heat exchanger, and arranges the U-shaped heat exchanger on the side where the outside air is introduced. While reducing the pressure loss, there is an advantage that can realize the optimum heat exchange amount and heat exchange efficiency in consideration of the specific volume of the refrigerant.

Third, the structure of sharing the header of the two heat exchangers with each other, the manufacturing cost is reduced, there is an advantage that can reduce the space occupied by the two heat exchangers.

1A is a block diagram illustrating a refrigerant cycle of a refrigerator according to a first embodiment of the present invention.
1B is a perspective view of a refrigerator according to a first embodiment of the present invention.
FIG. 2 is a perspective view illustrating a machine room of the refrigerator illustrated in FIG. 1.
3 is a perspective view of the outdoor heat exchanger shown in FIG. 2.
4 is a plan view of the outdoor heat exchanger illustrated in FIG. 2.
5 is a cross-sectional view of the first heat exchanger illustrated in FIG. 2.
6 is a cross-sectional view of the second heat exchanger illustrated in FIG. 2.
7 is a perspective view of an outdoor heat exchanger according to a second embodiment of the present invention.
8 is a perspective view of an outdoor heat exchanger according to a third embodiment of the present invention.
9 is a partial cross-sectional view around the outflow header of FIG. 8.
FIG. 10 is a partial cross-sectional view around the outlet header cut in a direction intersecting with FIG. 9.
FIG. 11 is a partial cross-sectional view around the outlet header cut in a direction intersecting with FIGS. 8 and 9.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

The spatially relative terms " below ", " beneath ", " lower ", " above ", " upper " It may be used to easily describe the correlation of components with other components. Spatially relative terms are to be understood as including terms in different directions of the component in use or operation in addition to the directions shown in the figures. For example, when flipping a component shown in the drawing, a component described as "below" or "beneath" of another component may be placed "above" the other component. Can be. Thus, the exemplary term "below" can encompass both an orientation of above and below. The components can be oriented in other directions as well, so that spatially relative terms can be interpreted according to the orientation.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and / or “comprising” refers to a component, step, and / or operation that excludes the presence or addition of one or more other components, steps, and / or operations. I never do that.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. In addition, the terms defined in the commonly used dictionaries are not ideally or excessively interpreted unless they are specifically defined clearly.

In the drawings, the thickness or size of each component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. In addition, the size and area of each component does not necessarily reflect the actual size or area.

In addition, the angle and direction mentioned in the process of demonstrating the structure of an Example are based on what was described in drawing. In the description of the structure constituting an embodiment in the specification, if the reference point and the positional relationship with respect to the angle is not clearly mentioned, reference is made to related drawings.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1A is a block diagram showing a refrigerant cycle of a refrigerator according to a first embodiment of the present invention, FIG. 1B is a perspective view of a refrigerator according to a first embodiment of the present invention, and FIG. 2 is a machine room of the refrigerator shown in FIG. It is a perspective view shown.

 1 and 2, a refrigerator according to an embodiment includes a main body 3 having a storage part 2 in which food is stored, a door 4 opening and closing the main body 3, and a storage part 2. And a cooling system for cooling.

The cooling system of the refrigerator according to the present embodiment includes a compressor 10 for compressing a refrigerant, a condenser 20 for condensing the refrigerant by heat exchange with outdoor air, an expansion mechanism 12 for expanding the refrigerant, and a refrigerant in the refrigerator. It may include an evaporator 13 which is evaporated by heat exchange with air.

The refrigerant compressed by the compressor 10 may pass through the condenser 20 to condense by exchanging heat with outdoor air. The condenser 20 is located in the machine room S provided inside the main body 1.

The refrigerant condensed in the condenser 20 may flow to the expansion mechanism 12 and expand. The refrigerant expanded by the expansion mechanism 12 may be evaporated by heat exchange with indoor air while passing through the evaporator 13. The evaporator 13 is arranged to exchange heat with air in the reservoir 2.

The refrigerant evaporated in the evaporator 12 may be recovered by the compressor 10.

The refrigerant is operated in a cooling cycle while circulating the compressor 10, the condenser 20, the expansion mechanism 12, and the evaporator 13.

The compressor 10 may be connected to a suction channel of the compressor 10 for guiding the refrigerant passing through the evaporator 13 to the compressor 10. The accumulator 14 in which the liquid refrigerant accumulates may be installed in the suction passage of the compressor 10.

The machine room S may be located at the rear lower side of the main body 1. The machine room S may be formed in a shape extending to both sides along the rear surface of the main body 1.

The machine room S may include a rear cover 30. The rear cover 5 may be provided to open and close the rear of the machine room (S). The rear cover 5 may be formed with an air inlet 7 through which air is introduced into the machine room S and an air outlet 32 through which air in the machine room S flows outward. The air inlet 7 and the air outlet 32 may be provided in plurality, respectively. The air inlet 7 and the air outlet 32 may be provided at different positions on the rear cover 5, or may be provided at positions facing each other.

Specifically, the air inlet 7 includes a first air inlet 5a formed at one side of the rear cover 30 and a second air inlet 6a formed at the side surface 6 of the main body 1. It may include.

In the machine room S, a condenser fan 15 for blowing outdoor air to the condenser 20 may be installed. An evaporator fan 16 for blowing indoor air to the evaporator 13 may be installed.

3 is a perspective view of the outdoor heat exchanger shown in FIG. 2, FIG. 4 is a plan view of the outdoor heat exchanger shown in FIG. 2, FIG. 5 is a sectional view of the first heat exchanger shown in FIG. 2, and FIG. 6 is shown in FIG. 2. It is sectional drawing of a 2nd heat exchange part.

3 to 6, the outdoor heat exchanger 20 is a micro channel type heat exchanger. Is formed of aluminum material.

The outdoor heat exchanger 20 is manufactured by overlapping a plurality of heat exchangers. In the present embodiment, the outdoor heat exchanger 20 includes a first heat exchanger 30 and a second heat exchanger 40.

The outdoor heat exchanger 20 has a first heat exchanger 30 disposed in a relatively forward direction, and a second heat exchanger disposed in the rear of the first heat exchanger 30, overlapping the first heat exchanger 30. 40, an inlet pipe 22 connected to the first heat exchanger 30 to supply the refrigerant, a discharge tube 25 connected to the first heat exchanger 30 to discharge the refrigerant, and a first heat exchanger A first connecting pipe 24a connecting the 30 and the second heat exchanger 40, and guiding the refrigerant from the first heat exchanger 30 to the second heat exchanger 40, and the first heat exchanger 30. ) And the second heat exchanger 40, and a second connection tube 24b for supplying the refrigerant discharged from the second heat exchanger 40 to the first heat exchanger 30.

In the embodiment, the refrigerant supplied from the outside may flow in the order of the first heat exchanger 30, the second heat exchanger 40, and the first heat exchanger 30, and may flow out again. However, the present invention is not limited thereto, and in another embodiment, the refrigerant supplied from the outside may flow in the order of the first heat exchanger 30 and the second heat exchanger 40, and may flow out again. The configuration of another embodiment will be described later with reference to FIG. 8.

The first heat exchanger 30 is disposed in the front relatively, and the second heat exchanger 40 is disposed in the rear relatively. Outside air may flow from rear to front. The second heat exchanger 40 is disposed adjacent to the air inlet 6 relative to the first heat exchanger 30.

The first heat exchanger 30 and the second heat exchanger 40 overlap each other in the front-rear direction. The first heat exchanger 30 and the second heat exchanger 40 are not physically installed. The first heat exchanger 30 and the second heat exchanger 40 overlap each other in the front-rear direction and are spaced apart by a predetermined distance without being contacted.

The heat conduction is prevented through the separation of the first heat exchanger 30 and the second heat exchanger 40.

The first heat exchanger 30 includes a plurality of flat tubes 50. The second heat exchange part 40 includes a plurality of flat tubes 50. The plurality of flat tubes 50 are laminated and manufactured.

In the first heat exchange part 30, the flat tube 50 is horizontally disposed, and the refrigerant is horizontally moved along the flat tube 50.

In the second heat exchange part 40, the flat tube 50 is horizontally disposed, and the refrigerant is horizontally moved along the flat tube 50.

The first heat exchanger 30 has a plurality of first flat tube 50-1 having a plurality of flow paths formed therein, a fin 60 connecting the first flat tube 50-1 to conduct heat; A first left header 70 coupled to one side of the plurality of first flat tubes 50-1, communicating with one side of the plurality of first flat tubes 50-1, and having a refrigerant flowing therein, and a plurality of first flat tubes ( 50-1) The first right header 80, the first left header 70 and the first right header, which are coupled to the other side and communicate with the other side of the plurality of first flat tubes 50-1, through which the refrigerant flows. It is formed in the 80, and includes the baffles (90) for partitioning the interior.

The passage is formed in the first flat tube 50-1 by extending in the longitudinal direction. A plurality of flow paths are formed in the first flat tube 50-1.

The first flat tube 50-1 is disposed horizontally (left and right directions), and a plurality of first flat tubes 50-1 are stacked in the vertical direction (vertical).

The left side of the first flat tube 50-1 communicates with the first left header 70, and the right side communicates with the first right header 80.

 The pin 60 may be formed to be bent in the vertical direction. The fin 60 connects two first flat tubes 50-1 stacked in the vertical direction to conduct heat.

The baffles 90 are installed on the first left header 70 and the first right header 80.

The baffle 90 divides the inside of the first left header 70 and the first right header 80 into two spaces. The baffle 90 partitions the inside of the first left header 70 and the first right header 80 in the vertical direction.

The direction of the refrigerant flowing in the upper side and the direction of the refrigerant flowing in the lower side with respect to the baffle 90 are formed opposite to each other.

The upper space of the first left header 70 and the first right header 80 divided by the baffle 90 is defined as the 1-1 space 91 and the first left header 70 divided by the baffle 90. ) And the lower space of the second right header 81, 80 are defined as the 1-2 space 92.

The first flat tubes 50-1 disposed on the upper side of the baffle 90 are defined as 1-1 passes 51, and the first flat tubes 50-1 disposed on the lower side of the baffle 90 are defined by 1. It is defined as -2 passes 52.

 The inlet pipe 22 is connected to the 1-1 space 91 of the first left header 70, and the outlet pipe 25 is connected to the 1-2 space 92 of the first left header 70. The first connector 24a is connected to the 1-1 space 91 of the first right header 80, and the second connector 24b is connected to the 1-2 space 92 of the first right header 80. ) Is connected.

One side of the 1-1 path 51 is connected to the inlet pipe 22, and the other side of the 1-1 path 51 is connected to the first connection tube 24a. In the 1-2 pass 52, the refrigerant flows in the opposite direction to the 1-1 pass 51, one side of the 1-2 pass 52 is connected to the discharge pipe 25, and the other side is connected to the second connection pipe ( 24b).

 The refrigerant supplied to the 1-1 space 91 of the first left header 70 through the inlet pipe 22 passes through the first flat tubes 50-1 of the 1-1 pass 51 to the first right header. It flows into the 1-1 space 91 of the 80. The refrigerant supplied to the 1-1 space 91 of the first right header 80 flows to the first connecting pipe 24a. The refrigerant supplied to the first connecting pipe 24a flows to the second heat exchange part 40.

The refrigerant supplied to the second heat exchange part 40 flows back to the second connection tube 24b, and the refrigerant supplied to the second connection tube 24b is spaced 1-2 of the first right header 80. Flows). The refrigerant supplied to the 1-2 space 92 of the first right header 80 is 1-2 of the first left header 70 along the first flat tubes 50-1 of the 1-2 pass 52. Flow into the space 92. The refrigerant supplied to the 1-2 space 92 of the first left header 70 flows out of the outdoor heat exchanger 20 through the outlet pipe 25.

In this embodiment, in order to reduce the pressure loss of the refrigerant, the cross-sectional area of the inlet pipe 22, the connecting pipe 25 and the discharge pipe 25 is optimized.

In this embodiment, the cross-sectional areas of the inlet pipe 22, the connecting pipe 24 and the discharge pipe 25 are designed to be 25% or more of the header.

 It is preferable that the cross-sectional areas of the inflow pipe 22, the connection pipe 25, and the discharge pipe 25 are formed to be 40% or more of each header cross-sectional area.

In the present embodiment, the first flat tubes 50-1 of the first heat exchanger 30 are divided into two passes, but unlike the present embodiment, the baffle 90 is not disposed, and one pass is formed. It is okay.

 In this embodiment, the second heat exchanger 40 has two passes. The second heat exchange part 40 is similar to the first heat exchange part 30.

The second heat exchange part 40, like the first heat exchange part 30, includes a plurality of second flat tubes 50-2, fins 60, a second left header 71, and a second right header 81. And a baffle 90.

Here, the plurality of second flat tubes 50-2 is composed of 2-1 passes 53 and 2-2 passes 55.

The second flat tube 50-2 is disposed horizontally, and a plurality of second flat tubes 50-2 are stacked in the vertical direction.

The left side of the second flat tube 50-2 communicates with the second left header 71, and the right side communicates with the second right header 81.

 The pin 60 may be formed to be bent in the vertical direction. The fin 60 connects two second flat tubes 50-2 stacked in the vertical direction to conduct heat.

The baffle 90 is installed in the second right header 81, 80. The inside of the second right header 81 is divided into two spaces by one baffle 90. The inside of the second left header 71 is formed as one space.

The baffle 90 provided in the second right header 81 is installed between the 2-1st pass 53 and the 2-2 pass 55.

The baffle 90 divides the inside of the second right header 81 into 2-1 space 94 and 2-2 space 96. The internal space of the second left header 71 is defined as three spaces 97.

The baffles 90 are for flowing the refrigerant in the respective passes of the second flat tube 50-2. The flow direction is switched from left to right or right to left with respect to the baffle 90.

The second flat tubes 50-2 disposed on the upper side of the baffle 90 are defined as 2-1 passes 53, and the second flat tubes 50-2 disposed on the lower side of the baffle 90 are defined as 2-1. It is defined as -2 passes 55.

The refrigerant passing through the first heat exchange part 30 flows from the upper side to the lower side in the gravity direction. The refrigerant passing through the second heat exchange part 40 also flows from the upper side to the lower side in the gravity direction.

The refrigerant is sequentially flowed in the order of 2-1 pass 53 and 2-2 pass 55. Here, the refrigerant flowing in the gas and liquid state may be mixed, and since the refrigerant flows in the gravity direction, the liquid refrigerant may also flow smoothly.

The first connector 24a is connected to the 2-1 space of the second right header 81, and the second connector 24b is connected to the 2-2 space of the second right header 81.

One side of the 2-1 path 53 is connected to the first connector 24a, and the other side of the 2-1 path 53 is connected to the upper portion of the second left header 71. In the 2-2 pass 55, the refrigerant flows in the opposite direction to the 2-1 pass 53, one side of the 2-2 pass 55 is connected to the second connector 24b, and a 2-1 pass ( The other side of 53 is connected to the lower portion of the second left header 71.

The refrigerant supplied to the 1-1 space 91 of the first left header 70 through the inlet pipe 22 passes through the first flat tubes 50-1 of the 1-1 pass 51 to the first right header. It flows into the 1-1 space 91 of the 80. The refrigerant supplied to the 1-1 space 91 of the first right header 80 flows to the first connecting pipe 24a. The refrigerant supplied to the first connecting pipe 24a flows to the second heat exchange part 40.

The refrigerant supplied to the second heat exchange part 40 through the first connecting pipe 24a flows into the 2-1 space of the second right header 81 and into the 2-1 space of the second right header 81. The supplied coolant flows into the third space 97 of the second left header 71 via the second flat tubes 50-2 of the 2-1 pass 53. The refrigerant supplied to the three spaces 97 of the second left header 71 passes through the second flat tubes 50-2 of the 2-2 pass 55 to the two-two spaces of the second right header 81. Flows. The refrigerant supplied to the 2-2 space of the second right header 81 flows to the first heat exchange part 30 via the second connecting pipe 24b.

The refrigerant supplied to the first heat exchange part 30 through the second connecting pipe 24b flows into the 1-2 space 92 of the first right header 80. The refrigerant supplied to the 1-2 space 92 of the first right header 80 passes through the first flat tubes 50-1 of the 1-2 passes 52 and 1-2 of the first left header 70. Flow into the space 92. The refrigerant supplied to the 1-2 space 92 of the first left header 70 flows out through the outlet pipe 25.

 The second heat exchanger 40 shown in FIG. 6 is a sectional view before bending.

In the outdoor heat exchanger 20, the first heat exchange part 30 may be formed in a planar shape, and the second heat exchange part 40 may be bent to have a curvature. The bent outdoor heat exchanger 20 may exchange heat with the air sucked from the two sides.

The plurality of flat tubes 50 are inserted into the left header 70 and the right header 80, then placed in a furnace, and manufactured by performing high temperature blazing.

Thereafter, the manufactured second flat heat exchanger 40 is bent and bent.

As described in FIG. 2, the height and width of the machine room of the refrigerator are smaller than the length (front and rear direction) of the machine room, and the space inside the refrigerator is difficult to expand because it maintains a high internal capacity.

Therefore, in order to effectively utilize the internal space of the machine room, when the heat exchanger having a planar shape is arranged in a multi-row form, the machine room should be arranged in three or more rows where the width, height, and length of the machine room are limited. By arranging a plurality of heat planes having a planar shape, the air pressure loss is increased, and the efficiency is lowered, and the heat exchange area cannot be sufficiently secured.

When arranging the U-shaped heat exchanger, when arranged in two rows, since it is disposed inside the other, there is a problem that the flat tube 50 may be damaged due to excessive bending.

Accordingly, the present embodiment includes a second heat exchanger 40 including a first heat exchanger 30 having a planar shape and a bending portion 50b having a curvature. In particular, since the air inlet of the machine room is formed on two side surfaces, the heat exchange efficiency of the air introduced from the two side surfaces and the second heat exchange unit 40 is improved.

The first heat exchanger 30 defines one surface that intersects with the front-back direction. The flat tubes 50 of the first heat exchanger 30 extend in the left and right directions crossing the front and rear directions.

The second heat exchanger 40 includes a bending portion 50b bent at a set curvature. Of course, the second heat exchanger 40 may include flat portions 50a and 50c at both ends of the bending portion 50b, respectively.

The bending portion 50b is defined as an area to be bent in the flat tube 50. The bending portion 50b provides a bending area when the flat tubes 50 are arranged in multiple rows, thereby improving the degree of freedom of arrangement and minimizing the deformation of the flat tubes 50, thereby maintaining heat exchange efficiency in the heat exchange portion. To be.

The bending portion 50b is formed by bending a plurality of flat tubes 50 with a predetermined curvature. The bending direction of the bending portion 50b is preferably set in consideration of the fatigue pressure of the flat tube 50 and the air pressure loss according to the air flow.

The bending surface P of the bending portion 50b intersects with the vertical direction and is arranged in parallel with the air flow direction (front and rear direction). Here, the bending surface P defines the bending direction of the bending portion 50b. In particular, referring to FIG. 4, the bending surface P of the heat exchange part connects the center of one end of the bending portion 50b and the center of the other end of the bending portion 50b and the center C of the radius of curvature of the bending portion 50b. It is defined as a virtual plane.

Specifically, the bending surface P of the bending portion 50b is formed to form a surface parallel to the front-rear direction and the left-right direction, thereby reducing air pressure loss and improving heat exchange efficiency while utilizing a limited space of the machine room.

In addition, the bending surface P of the bending portion 50b is disposed in parallel with the long side of the flat tube 50. Therefore, even if the plurality of flat tubes 50 are bent, the air flow between the plurality of flat tubes 50 is not limited. Long sides are disposed above and below the flat tubes 50, and include short sides connecting the long sides.

If the radius of curvature R of the bending portion 50b is too small, the inner space of the flat tube 50 is narrowed to prevent the refrigerant from flowing smoothly, and if the radius of curvature R of the bending portion 50b is too large, Therefore, there is a disadvantage in that the heat exchange efficiency is lowered and the volume is increased by being larger than the width of the first heat exchanger 30.

Therefore, the radius of curvature R of the bending portion 50b may be smaller than the length of the flat tubes 50 of the first heat exchanger 30. The radius of curvature R of the bending portion 50b is preferably 50% to 40% of the length of the flat tubes 50 of the first heat exchanger 30.

The bending portion 50b is bent to protrude backward, so that air supplied from the rear to the front flows smoothly.

Specifically, the bending portion 50b may be made of a softer material than the flat tube 50 so that bending is easy.

The flat tubes 50 of the second heat exchange part 40 have a longer length than the flat tubes 50 of the second heat exchange part 40, and one end of the second heat exchange part 40 and the first heat exchange part 30. One end of) may overlap each other in the front-rear direction, and the other end of the second heat exchanger 40 and the other end of the first heat exchanger 30 may overlap each other in the front-rear direction.

Specifically, the first left header 70 and the second left header at least partially overlap in the front-back direction, and the second left header 71 and the second right header 81 at least partially overlap in the front-back direction.

Although the heat exchange area is greatly improved by the bending of the second heat exchange part 40, the air pressure loss may be increased. Therefore, the fin density of the second heat exchange part 40 may be lower than the peel density of the first heat exchange part 30.

Here, the pin density means how many pins are per unit length. Fin density of the second heat exchange part 40 is lowered, thereby reducing the air pressure loss of the air passing through the second heat exchange part 40. Therefore, the heat exchange efficiency in the first heat exchanger 30 is improved.

7 is a perspective view of an outdoor heat exchanger 20 according to a second embodiment of the present invention.

Referring to FIG. 7, the second embodiment further includes a third heat exchanger 50 as compared with the first embodiment.

Here, the first heat exchanger 30 and the second heat exchanger 40 are the same as those of the first embodiment.

The third heat exchange part 50 overlaps with the second heat exchange part 40 in the front-rear direction, but may be disposed relatively forward than the second heat exchange part 40.

The configuration of the third heat exchanger 50 may include flat tubes 50, fins, left headers, and right headers, similarly to the first heat exchanger 30.

The refrigerant introduced into the third heat exchanger 50 may flow in the order of the first heat exchanger 30, the second heat exchanger 40, and the first heat exchanger 30.

The length of the flat tube 50 of the third heat exchange part 50 may be the same as the length of the flat tube 50 of the first heat exchange part 30.

The fin density of the third heat exchanger 50 may be greater than the fin density of the first heat exchanger 30, and the fin density of the first heat exchanger 30 may be greater than the fin density of the second heat exchanger 40.

8 is a perspective view of an outdoor heat exchanger 20 according to a third embodiment of the present invention, FIG. 9 is a partial cross-sectional view of the periphery of the outlet header 73 of FIG. 8, and FIG. 10 is an outlet flow cut in a direction intersecting with FIG. 9. A partial cross-sectional view of the periphery of the header 73, FIG. 11 is a partial cross-sectional view of the periphery of the outflow header 73 cut in a direction intersecting with FIGS. 8 and 9.

Compared to the first embodiment, the third embodiment has a different refrigerant path from each heat exchanger, and there is a difference in the structure of sharing the header of the first heat exchanger 30 and the header of the second heat exchanger 40. . The configuration of the third embodiment is the same as that of the first embodiment, except as specifically described.

8 to 11, the flat tubes 50 and the fins 60 of the first heat exchanger 30 and the second heat exchanger 40 are the same as in the first embodiment.

The connecting tube of the first embodiment connecting the first heat exchange part 30 and the second heat exchange part 40 is omitted, and the positions of the inlet pipe 22 and the outlet pipe 25 are different from those of the first embodiment.

The first heat exchanger 30 and the second heat exchanger 40 have a single pass. The refrigerant introduced through the first heat exchanger 30 is heat exchanged in the first heat exchanger 30 and flows to the second heat exchanger 40, and the refrigerant supplied to the second heat exchanger 40 is again subjected to the first heat exchanger. It flows out through the part 30.

For example, the outdoor heat exchanger 20 of the embodiment includes an outlet header 73 and a connection header 83.

 The outflow header 73 communicates with one side of the flat tubes 50 of the first heat exchange part 30 and one side of the flat tubes 50 of the second heat exchange part 40 to flow the refrigerant. Outflow header 73 extends in the vertical direction.

The inlet pipe 22 is connected to the outflow header 73 to supply the refrigerant to the first heat exchange part 30, and the discharge pipe 25 is connected to the outflow header 73 to discharge from the second heat exchange part 40. To guide the refrigerant.

Since the header is shared through the outflow header 73 and the connection header 83, and the number of headers is reduced, the manufacturing cost is reduced.

Since the refrigerant supplied to the outdoor heat exchanger 20 and the refrigerant flowing out of the outdoor heat exchanger 20 cross each other, the outflow header 73 is restricted from being mixed with each other by the inertia of the refrigerant. Need structure.

For example, the outflow header 73 includes a plurality of first connection holes 111 to which the flat tubes 50 of the first heat exchange part 30 are connected, and the flat tube 50 of the first heat exchange part 30. And a plurality of second connection holes 112 to which they are connected, a third connection hole 113 to which the inlet pipe 22 is connected, and a fourth connection hole 114 to which the discharge pipe 25 is connected.

The first to fourth connection holes 114 are formed through the outflow header 73 in the horizontal direction. The first to fourth connection holes 114 may be spaced apart from each other in a vertical direction.

 Specifically, the first connecting holes 111 and the second connecting holes 112 may be disposed not to overlap each other in the horizontal direction. The first connection holes 111 and the second connection holes 112 may be alternately formed along the vertical direction.

The first connecting holes 111 and the second connecting holes 112 are formed in a direction crossing each other. When the outlet header 73 is formed to penetrate in the left and right directions, the second connection hole 112 may be formed by penetrating the outlet header 73 in the front and rear directions.

The third connection hole 113 may be disposed to face the at least one first connection hole 111, and the fourth connection hole 114 may be disposed to face the at least one second connection hole 112.

The third connection hole 113 is disposed to overlap the at least one first connection hole 111 in the horizontal direction, and the fourth connection hole 114 overlaps the at least one second connection hole 112 in the horizontal direction. Can be arranged.

The refrigerant supplied through the inlet pipe 22 flows in the horizontal direction, and the refrigerant is supplied to the first flat tubes 50-1 connected to the inlet pipe 22 by inertia. The refrigerant supplied through the second flat tubes 50-2 flows in the backward direction, and the refrigerant is supplied to the outlet pipe 25 connected to the second flat tube 50-2 by inertia.

Therefore, the refrigerant supplied to the first heat exchange part 30 through the outflow header 73 and the refrigerant flowing out of the second heat exchange part 40 through the outflow header 73 may be restricted.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments but may be manufactured in various forms, and having ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

10 compressor 12 expansion mechanism
13: indoor heat exchanger 14: accumulator
15: outdoor fan 16: indoor fan
20: outdoor heat exchanger 22: inlet pipe
24: connector 25: discharge tube
30: first heat exchanger 40: second heat exchanger
50: flat tube 60: pin

Claims (14)

A first heat exchanger having a flow path through which a refrigerant flows and including a plurality of flat tubes stacked vertically and fins connecting the plurality of flat tubes; And
A flow path through which a refrigerant flows is formed, and includes a plurality of flat tubes stacked vertically and fins connecting the plurality of flat tubes, and a second heat exchanger disposed behind the first heat exchanger,
Fin density of the second heat exchange part is lower than the peel density of the first heat exchange part, the first heat exchange part is disposed to overlap with the second heat exchange part,
The flat tubes of the first heat exchange part are disposed parallel to the left and right directions,
The flat tubes of the second heat exchanger further includes a bending portion bent at a predetermined curvature. The method according to claim 1,
The bending portion,
A heat exchanger in a refrigerator defining a banding surface that intersects with the vertical direction. The method according to claim 1,
The long side of the flat tube is a heat exchanger of the refrigerator disposed parallel to the bending surface of the bending portion. The method according to claim 1,
An air inlet unit through which external air is introduced; And
Further, the air flowing in and the heat exchange with the heat exchanger further comprises an air outlet portion,
And the second heat exchange part is disposed adjacent to the air inlet part relative to the first heat exchange part. The method according to claim 1,
The refrigerant supplied from the outside flows in the order of the first heat exchanger, the second heat exchanger, and the first heat exchanger, and flows back to the outside. The method according to claim 1,
An inlet pipe connected to the first heat exchanger to supply a refrigerant to the first heat exchanger;
A discharge tube connected to the first heat exchanger to guide the refrigerant discharged from the second heat exchanger;
A first connection pipe connecting the first heat exchanger and the second heat exchanger, and supplying the refrigerant discharged from the first heat exchanger to the second heat exchanger;
A second connecting tube connecting the first heat exchanger and the second heat exchanger and supplying the refrigerant discharged from the second heat exchanger to the first heat inductor; Heat exchanger of the refrigerator comprising a. The method according to claim 6,
The first heat exchanger,
A 1-1 pass connected to the inlet pipe; And
Refrigerant flows in a direction opposite to the 1-1 pass, and includes a 1-2 pass connected to the discharge pipe,
The second heat exchanger,
A 2-1 pass connected to the 1-1 pass through a first connector;
And a 2-2 pass connected to the 2-1 pass, the refrigerant flowing in a direction opposite to the 2-1 pass, and connected to the 1-2 pass and the second connection pipe. The method according to claim 1,
An inflow and outflow header in which a refrigerant flows in communication with one side of flat tubes of the first heat exchange part and one side of flat tubes of the second heat exchange part;
A connection header in communication with the other sides of the flat tubes of the first heat exchange part and the other sides of the flat tubes of the second heat exchange part, in which a refrigerant flows;
An inlet pipe connected to the outlet header for supplying a refrigerant to the first heat exchange part;
And a discharge tube connected to the outlet header for guiding the refrigerant discharged from the second heat exchange unit. The method according to claim 8,
The outflow header extends in the vertical direction,
The outflow header is
A plurality of first connecting holes to which the flat tubes of the first heat exchange part are connected;
The heat exchanger of the refrigerator including a plurality of second connecting holes to which the flat tubes of the first heat exchanger are connected. The method according to claim 9,
The heat exchanger of the refrigerator, wherein the first connection holes and the second connection holes are disposed not to overlap each other in the horizontal direction. The method according to claim 9,
The heat exchanger of the refrigerator formed in a direction in which the first connecting holes and the second connecting holes cross each other. The method according to claim 9,
The heat exchanger of the refrigerator, wherein the first connection holes and the second connection holes are alternately formed along the vertical direction. The method according to claim 9,
The outflow header is
A third connection hole to which the inflow pipe is connected,
A fourth connection hole to which the discharge pipe is connected,
The third connector is disposed facing the at least one first connector,
The fourth connector is a heat exchanger of the refrigerator disposed to face at least one second connector. The method according to claim 13,
The third connector is arranged to overlap with the at least one first connector in a horizontal direction,
The fourth connection hole is a heat exchanger of the refrigerator disposed to overlap with the at least one second connection hole in the horizontal direction.

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