JP2020180752A - Heat exchanger, heat exchanger unit and indoor unit of air conditioner - Google Patents

Abstract

To provide a heat exchanger capable of preventing dew condensation water from being scattered to the outside of an indoor machine.SOLUTION: A heat exchanger comprises: a heat transfer pipe unit having a plurality of heat transfer pipes and at least one fin, wherein at least one fin includes a scattering prevention fin; and a hollow header pipe connected to one end of the heat transfer pipe unit. The scattering prevention fin is configured to contact the outer surface of the header pipe. A linear distance from the center line of the heat transfer pipe unit to the outer surface of the scattering prevention fin is configured to be greater than or equal to a linear distance from the center line of the heat transfer pipe unit to the outer surface of the header pipe in contact with the scattering prevention fin.SELECTED DRAWING: Figure 2

Description

The present invention relates to a parallel flow heat exchanger having a heat transfer tube unit, a heat exchanger unit using this heat exchanger, and an indoor unit of an air conditioner using this heat exchanger unit.

Generally, a separate type indoor air conditioner which is divided into an indoor unit and an outdoor unit is provided with a heat exchanger and a cross flow fan inside. In such a separate type indoor air conditioner, the heat exchanger is usually arranged so as to surround the cross flow fan in order to generate an air flow on the surface of the air conditioner to promote heat exchange. .. As the heat exchanger, a heat exchanger composed of a heat transfer tube through which a refrigerant flows and fins that exchange heat is generally used.

FIG. 9 is a diagram showing an example of a general heat exchanger. This heat exchanger includes a linear copper tube 101, fins 102, and a U-shaped copper tube 104. The copper pipes 101 and 104 are pipes for circulating the refrigerant inside. The refrigerant circulating inside the copper pipes 101 and 104 exchanges heat with the fins 102 on their surfaces. The fin 102 is generally made of a thin aluminum plate, and is provided with a plurality of through holes 103 for passing a copper tube. In the heat exchanger of FIG. 9, a plurality of fins 102 are arranged in a stacked state, and a linear copper tube 101 is inserted into the through hole 103. The copper pipe 101 and the fin 102 are mechanically connected by press-fitting a taper pin into the inserted copper pipe 101 to expand it. A U-shaped copper pipe 104 is brazed and integrated at the end of the linear copper pipe 101 to form a pipeline for circulating the refrigerant.

By the way, heat exchange efficiency is an important factor that determines the performance of a heat exchanger. In the heat exchanger, for example, as shown in Japanese Patent Application Laid-Open No. 2018-155479, a heat transfer tube through which a refrigerant flows and fins for heat exchange are configured as an integral member in order to improve heat exchange efficiency. There is a parallel flow heat exchanger with a heat transfer tube unit (see FIG. 10). As shown in FIG. 10, the heat exchanger of Patent Document 1 includes a pair of header pipes 108 and 109 arranged at intervals, and a plurality of heat exchangers having both ends in the extending direction connected to the header pipes 108 and 109, respectively. The heat transfer tube unit 107 is provided. In each heat transfer tube unit 107, a heat transfer tube 105 through which a refrigerant flows and a fin 106 for heat exchange are integrally formed. FIG. 11 is a partially enlarged view of a cross section of the connection portion of the heat exchanger shown in FIG. As shown in FIG. 11, the extending end of the heat transfer tube 105 is connected to the internal space of the header pipes 108 and 109 (in FIG. 11, only one header pipe 108 is shown), together with the header pipes 108 and 109. It constitutes a pipeline that circulates the refrigerant.

JP-A-2018-155479

In order to efficiently arrange the heat exchanger in the limited space, it is necessary to arrange the heat exchanger so as to surround the cross flow fan as described above. Therefore, the heat exchanger may be arranged in an inclined state with respect to the direction of gravity. During the cooling operation, moisture contained in the indoor air condenses on the entire surface of the heat exchanger, and the amount increases with time. This condensed water needs to travel downward along the surface of the heat exchanger, drop from the lower end of the heat exchanger onto the water tray inside the indoor unit, and be discharged to the outside from the drain pipe connected to the water tray. However, in the heat exchanger of Patent Document 1 shown in FIG. 10, when the heat exchanger is arranged in an inclined state with respect to the direction of gravity, for example, when dew condensation water is deposited on the surface of the header pipe 108 above the heat exchanger, this dew condensation occurs. The water does not flow down to the lower end of the heat exchanger through the fin 106, but drops directly from the header pipe 108 onto the cross flow fan and scatters to the outside of the indoor unit. Therefore, as disclosed in Patent Document 1, a parallel flow heat exchanger having a heat transfer tube unit 107 in which a heat transfer tube 105 through which a refrigerant flows and a fin 106 for heat exchange are integrally formed is used as an indoor air conditioner. When used in, it may not be possible to prevent the scattering of condensed water.

The present invention solves the above-mentioned problems in a parallel flow heat exchanger having a heat transfer tube for flowing a refrigerant and a heat transfer tube unit in which fins for heat exchange are integrally formed, and dew condensation on the heat exchanger. It is an object of the present invention to provide a heat exchanger capable of reliably dripping from the lower end of the heat exchanger with a water tray to prevent dew condensation water from scattering to the outside of the indoor unit.

In order to achieve the above object, the heat exchanger according to one aspect of the present invention is
It has a plurality of heat transfer tubes for circulating a refrigerant and at least one fin extending along the extending direction of each of the plurality of heat transfer tubes to exchange heat with the refrigerant, and the plurality of heat transfer tubes and the at least the plurality of heat transfer tubes. A heat transfer tube unit in which one fin is integrally formed side by side in an arrangement direction intersecting the extending direction, and the at least one fin includes a shatterproof fin arranged at one end in the arrangement direction. When,
A hollow header pipe connected to one end of the heat transfer tube unit in the extending direction of the unit center line is provided.
The shatterproof fin
The one end is configured to come into contact with the outer surface of the header pipe.
At one end, the linear distance from the center line of the heat transfer tube unit extending in the extending direction to the outer surface of the shatterproof fin in the center of the arrangement direction comes into contact with the shatterproof fin from the unit center line. It is configured to be equal to or greater than the linear distance to the outer surface of the header pipe.

The heat exchanger unit according to one aspect of the present invention is
A pair of heat exchangers of the above embodiment is provided.
Each of the pair of heat exchangers
The center lines are arranged so as to intersect in the vertical direction and extend in a direction away from each other from the upper side to the lower side in the vertical direction.
The shatterproof fins are arranged at the lower end in the vertical direction of both ends of the heat transfer tube unit in the arrangement direction.

The indoor unit of the air conditioner according to one aspect of the present invention is
The heat exchanger unit of the above aspect and
A fan arranged on the lower side of the heat exchanger unit in the vertical direction,
It is provided with a water tray arranged around the fan and receiving condensed water dripping through each of the pair of heat exchangers of the heat exchanger.

According to the heat exchanger of one aspect of the present invention, the anti-scattering fin is configured to contact the outer surface of the header pipe at one end in the extending direction of the center line of the heat transfer tube unit, at one end. The linear distance from the center line of the heat transfer tube unit to the outer surface of the shatterproof fin is equal to or greater than the linear distance from the center line of the heat transfer tube unit to the outer surface of the header pipe in contact with the shatterproof fin. ing. With such a configuration, for example, even if the heat exchanger is arranged at an angle with respect to the direction of gravity, it is possible to realize a heat exchanger capable of preventing dew condensation water from scattering to the outside of the indoor unit.

Further, according to the heat exchanger unit of one aspect of the present invention, it is possible to realize a heat exchanger unit capable of preventing the scattering of condensed water to the outside of the indoor unit by the heat exchanger.

Further, according to the heat exchanger unit of one aspect of the present invention, it is possible to realize an indoor unit of an air conditioner capable of preventing the scattering of condensed water to the outside by the heat exchanger unit.

The schematic side view of the indoor unit provided with the heat exchanger in one Embodiment of this invention. The side view explaining the heat exchanger unit including the heat exchanger of one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line III-III of FIG. The perspective view which shows the header pipe of the heat exchanger unit of FIG. The first side view for demonstrating the manufacturing method of the heat exchanger of FIG. The second side view for demonstrating the manufacturing method of the heat exchanger of FIG. FIG. 5 is a side view showing a first embodiment of the heat exchanger of FIG. 2 is a side view showing a second embodiment of the heat exchanger of FIG. The perspective view which shows the conventional heat exchanger. The perspective view which shows the parallel flow heat exchanger of Patent Document 1. FIG. A partially enlarged view of the parallel flow heat exchanger of Patent Document 1.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, terms indicating a specific direction or position (for example, terms including "upper", "lower", "front", and "rear") are used as necessary, but the use of these terms is used. Is for facilitating the understanding of the present disclosure with reference to the drawings, and the meaning of those terms does not limit the technical scope of the present disclosure. In addition, the following description is merely an example and is not intended to limit the present disclosure, its application, or its use. Furthermore, the drawings are schematic, and the ratio of each dimension does not always match the actual one.

(1) Overall Configuration The heat exchanger of one embodiment of the present invention can be applied to an indoor unit of an air conditioner used in a general household, for example, as shown in FIG. FIG. 1 is a schematic side view of an indoor unit 10 provided with heat exchangers 1a and 1b according to an embodiment of the present invention. In FIG. 1, the inside of the indoor unit 10 is transparent.

As shown in FIG. 1, the indoor unit 10 includes a casing 26 forming an outer shell, a heat exchanger unit 1 having a pair of heat exchangers 1a and 1b inside, and a cross flow fan 12. There is. The casing 26 has a front opening 10a located on the front side of the heat exchanger unit 1 and an upper surface opening 10b located on the upper surface side of the heat exchanger unit 1. The cross-flow fan 12 exchanges heat in the room taken in from the front opening 10a and the top opening 10b with the heat exchangers 1a and 1b and blows them out into the room.

The front opening 10a is provided with a movable front panel (hereinafter, simply referred to as a front panel) 11 that can be opened and closed. The front panel 11 closes the front opening 10a when the air conditioner is stopped, whereas the front panel 11 moves away from the casing 26 to open the front opening 10a when the air conditioner is operating. Note that FIG. 1 shows only the state in which the front opening 10a is opened.

Further, the indoor unit 10 includes an outlet 13 for blowing out the heat-exchanged air blown out by the cross flow fan 12 into the room. The air outlet 13 is provided with a vertical wind direction changing blade 14 that opens and closes an opening and changes the air blowing direction up and down, and a left and right wind direction changing blade 15 that changes the air blowing direction left and right.

The vertical wind direction changing blades 14 are a lower blade 19 that opens and closes the air outlet 13, and an upper blade that is provided above the lower blade 19 and controls the blowing direction of air blown from the air outlet 13 in cooperation with the lower blade 19. It is composed of 20.

When the air conditioner starts operation, the vertical wind direction changing blades 14 are driven by a drive source (not shown) to open the air outlet 13. Further, the cross flow fan 12 is driven by a drive source (not shown), and indoor air is taken into the indoor unit 10 via the front opening 10a and the upper surface opening 10b. The taken-in indoor air is heat-exchanged by the heat exchangers 1a and 1b, and is blown out by the cross-flow fan 12 from the air outlet 13 through the ventilation passage 21 formed on the downstream side of the cross-flow fan 12. To.

The ventilation passage 21 located on the upstream side of the air outlet 13 includes a rear guider 22 located on the downstream side of the cross flow fan 12, a stabilizer 23 located on the downstream side of the cross flow fan 12 and facing the rear guider 22, and left and right side walls. It is formed of 24.

The term "stabilizer" described above is a stabilizer located near the downstream side of the cross flow fan 12 and stabilizing a vortex generated near the front portion of the cross flow fan 12, and a stabilizer located on the downstream side of the stabilizer and cross flow. It can be divided into a front wall portion of a diffuser that recovers the pressure of the air conveyed by the fan 12, but in the present specification, these are collectively referred to as a "stabilizer".

Further, the casing 26 is arranged around the cross flow fan 12 and has water trays 18a and 18b for receiving and draining the condensed water from the heat exchangers 1a and 1b. The water tray 18a is provided on the front side of the stabilizer 23, and the water tray 18b is provided on the back side of the upper end of the rear guider 22.

(2) Configuration of Heat Exchanger Next, the heat exchangers 1a and 1b will be described in more detail with reference to FIGS. 2 to 6.

As shown in FIG. 2, the heat exchangers 1a and 1b are parallel to each other by a pair of header pipes 3 and 4 arranged at the inlet and outlet of the refrigerant and a plurality of heat transfer tube units 2 installed between them. It is a flow heat exchanger. In the present embodiment, the heat exchanger unit is composed of a pair of heat exchangers 1. The heat exchangers 1a and 1b are arranged on the upper side of the cross flow fan 12 in the vertical direction and on substantially different sides of the virtual straight line L extending in the vertical direction through the rotation shaft 12a of the cross flow fan 12. There is. The heat exchangers 1a and 1b have the same configuration except that the lengths of the center lines CL of the heat transfer tube unit 2 described later in the extending direction are different. Therefore, in the following description, only one heat exchanger 1a will be described, and the description of the other heat exchanger 1b will be omitted.

The heat transfer tube unit 2 is, for example, an elongated flat plate extending along the center line CL, having a plurality of heat transfer tubes 5 extending along the center line CL, and at least one extending along the extending direction of each heat transfer tube 5. It has two fins 6. The center line CL of the heat transfer tube unit 2 passes through the center of the heat transfer tube 5 and the fins 6 in the heat transfer tube unit 2 in the arrangement direction (hereinafter, simply referred to as the arrangement direction) and extends in a direction orthogonal to the arrangement direction. The inside of each heat transfer tube 5 forms a part of the refrigerant flow path, and the refrigerant is circulated. The fins 6 are heat radiating plates and exchange heat with the refrigerant in each heat transfer tube 5. The heat transfer tubes 5 and the fins 6 are arranged alternately in a direction intersecting the center line CL, for example, in a direction orthogonal to each other. Further, fins 6 are arranged at both ends of the heat transfer tube unit 2 in the arrangement direction. That is, in this embodiment, in the heat transfer tube unit 2, the heat transfer tubes 5 and the fins 6 are alternately arranged along the arrangement direction so that the adjacent fins 6 sandwich the heat transfer tube 5. At least one fin 6 includes a shatterproof fin 6b. The shatterproof fin 6b is arranged at one end of the heat transfer tube unit 2 in the arrangement direction.

FIG. 3 shows a cross-sectional view taken along the line III-III of FIG. In the present embodiment, as described above, the fins 6 are provided at both ends of the heat transfer tube unit 2 in the arrangement direction, and the heat transfer tubes 5 and the fins 6 are alternately arranged along the arrangement direction. The shape of the heat transfer tube 5 is, for example, a diamond shape having a height of 0.5 mm and a width of 0.8 mm in order to reduce the ventilation resistance when air passes through the heat exchangers 1a and 1b. The height of the heat transfer tube 5 is more preferably about 0.3 mm. The thickness of the fin 6 is, for example, 0.3 mm, more preferably 0.2 mm or less. The heat transfer tube 5 functions as a flow path including an inlet and an outlet for various refrigerants such as gas, liquid, and gas-liquid two-phase.

FIG. 4 shows a schematic view of the header pipes 3 and 4. The header pipes 3 and 4 are hollow members having a substantially rectangular parallelepiped shape, and have a connecting surface 9 in which a plurality of through holes 8 for inserting the heat transfer tube unit 2 are formed. Both ends of the plurality of heat transfer tubes 5 of the heat transfer tube unit 2 are inserted into and fixed to the inside of the header pipes 3 and 4, respectively, through the plurality of through holes 8. That is, the header pipes 3 and 4 are configured so that the refrigerant is supplied to the inside through the plurality of heat transfer tubes 5. Each through hole 8 has a shape in which the heat transfer tube unit 2 can be inserted from its extending direction, that is, a shape composed of a plurality of rhombuses and a rectangle connecting the rhombuses. The through holes 8 are arranged side by side at intervals in a direction intersecting the extending direction of the through holes 8. In the present embodiment, as an example, the through holes 8 are arranged side by side at equal intervals in a direction orthogonal to the extending direction of the through holes 8. That is, each of the plurality of heat transfer tube units 2 is inserted into each through hole 8 in a state of being parallel to each other and having its extending direction orthogonal to the connecting surface 9 of the header pipes 3 and 4. Further, the through holes 8 are arranged in a staggered manner in which the rhombic portions of the adjacent through holes 8 are displaced in the extending direction of the through holes 8. As a result, the heat transfer tube unit 2 is configured to be efficiently arranged.

The header pipes 3 and 4 and the heat transfer tube unit 2 are all made of a metal material having good thermal conductivity, such as aluminum or an aluminum alloy.

(3) Arrangement of Heat Exchanger Units As described above, the heat exchanger unit 1 includes a pair of heat exchangers 1a and 1b having different lengths. Each of the heat exchangers 1a and 1b has a linear shape extending along the extending direction of the center line CL of the heat transfer tube unit 2 (see FIG. 2).

The heat exchangers 1a and 1b are arranged inside the indoor unit 10 so that the extending directions of the header pipes 3 and 4 are parallel to the width direction of the indoor unit 10 (that is, the paper penetration direction of FIG. 1). Has been done. Assuming that the header pipes 3 and 4 of the longer heat exchanger 1a are the header pipes 3a and 4a and the header pipes 3 and 4 of the shorter heat exchanger 1b are the header pipes 3b and 4b, the header pipes 3a and 3b are The header pipes 4a and 4b are arranged above the cross flow fan 12, and the header pipes 4a and 4b are arranged below the header pipes 3a and 3b and above the water pans 18a and 18b, respectively.

The heat exchanger 1a is arranged substantially in front of the rotation shaft 12a of the cross flow fan 12. The heat exchanger 1a is tilted backward toward the cross flow fan with respect to the front surface so as to surround the cross flow fan 12 in a limited space in order to function efficiently as a heat exchanger. Further, the heat exchanger 1b is arranged substantially rearward of the rotation axis of the cross flow fan 12 and substantially above the rotation axis of the cross flow fan 12 so as to be tilted forward with respect to the cross flow fan 12. That is, when the heat exchangers 1a and 1b are viewed along the extending direction of the rotation shaft 12a of the cross flow fan 12, the center line CL of the heat transfer tube unit 2 intersects in the vertical direction and is vertical. It is arranged so as to extend in a direction away from each other from the upper side to the lower side in the direction, in other words, to extend in a direction away from the virtual straight line L. With such an arrangement, each heat transfer tube unit 2 surrounds a part of the upper side of the cross flow fan 12 in the vertical direction, and when viewed along the extending direction of the rotation shaft 12a of the cross flow fan 12. In addition, it extends substantially parallel to the tangent line of the cross flow fan 12.

As shown in FIG. 6, the shatterproof fins 6b are arranged on the lower end in the vertical direction of both ends of the center line CL of the heat transfer tube unit 2 in the extending direction, and are arranged on the outer surface 31 of the header pipe 3. It is configured to make contact. The shatterproof fin 6b has a heat transfer tube having a linear distance W1 from the center line CL of the heat transfer tube unit 2 to the outer surface 6c of the shatterproof fin 6b at one end in the extending direction of the center line CL of the heat transfer tube unit 2. It is configured so that the linear distance from the center line CL of the unit 2 to the outer surface 31 of the header pipe 3 in contact with the shatterproof fin 6b is W2 or more, that is, the relationship of W1 ≧ W2 is satisfied. The shatterproof fins 6b may be configured to satisfy the relationship of W1 ≧ W2 with respect to the header pipe 3 located above the cross flow fan 12 at least.

(4) Manufacturing Method of Heat Exchangers 1a and 1b First, the manufacturing process of the heat transfer tube unit 2 will be described. The heat transfer tube unit 2 is extruded by using a mold forming the cross-sectional shape of FIG. The heat tube 5 and the fin 6 are integrally and continuously formed. After extrusion molding, zinc spraying as a sacrificial layer is performed on the surface to prevent corrosion. Since this extrusion molding step is continuously performed, the heat transfer tube unit 2 is formed in a state of being wound around a reel bobbin (not shown), linearly formed by a cutting machine (not shown), and then cut to a predetermined length. Will be done. The shape of the tip portion of the cut heat transfer tube unit 2 is shown in FIG. The tip of the heat transfer tube unit 2 has edges 7a and 7b that serve as stoppers when inserted into the through holes 8 of the header pipes 3 and 4, and the header pipe 3 with the heat exchangers 1a and 1b installed in the indoor unit 10. It is cut in a shape in which the end portion 7c is left so as to be below the end portion in the vertical direction of.

In the present embodiment, as shown in FIG. 3, the heat transfer tube unit 2 has a left-right asymmetric shape in the arrangement direction. The fin width is such that shatterproof fin 6b> fin 6a. The edge 7a is formed on the fin 6a, and the edge 7b and the edge 7c are formed on the shatterproof fin 6b. It is desirable that the edges 7a, 7b and 7c are formed in the pressing step after the heat transfer tube unit cutting step.

Next, the assembly process of the heat exchangers 1a and 1b using the manufactured heat transfer tube unit 2 will be described. In the assembly step, the plurality of heat transfer tube units 2 formed in the above-mentioned cross-sectional shape are alternately inverted and aligned with the plurality of through holes 8 formed in the connection surfaces 9 of the header pipes 3 and 4. At this time, the plurality of heat transfer tube units 2 are arranged at intervals so as to be the same as the adjacent through holes 8 of the header pipes 3 and 4 by using a jig (not shown). A plurality of aligned heat transfer tube units 2 are inserted into the through holes 8 of the corresponding header pipes 3 and 4 (see FIG. 6). After inserting all the heat transfer tube units 2 into the through holes 8, temporarily fix the heat transfer tube units 2 and the header pipes 3 and 4 using wires or the like so that the heat transfer tube units 2 do not come off from the header pipes 3 and 4. To do. After temporarily fixing the heat transfer tube unit 2 and the header pipes 3 and 4, the jig is removed. Even after the jig is removed, the wires can keep the edges 7a and 7b of the heat transfer tube unit 2 in contact with the connection surfaces 9 of the header pipes 3 and 4. As a result, the heat exchangers 1a and 1b can maintain a predetermined shape. The header pipes 3 and 4 have a clad layer in which the brazing material is deposited by heating. By heating the heat exchangers 1a and 1b in this state for a predetermined time, the brazing material melted from the header pipes 3 and 4 fills the gap between the through hole 8 and the heat transfer tube unit 2. As a result, the header pipes 3 and 4 and the heat transfer tube unit 2 are mechanically fixed. As a result, the inside of the header pipes 3 and 4 and the inside of the heat transfer tube 5 of the heat transfer tube unit 2 are sealed in a communicated state to form a refrigerant flow path through which the refrigerant circulates. In FIG. 4, although the ends of the header pipes 3 and 4 are open, they are actually sealed and the refrigerant flow path is a closed circuit.

(5) Flow of Condensed Water Each of the heat exchangers 1a and 1b manufactured in this manner is arranged so as to surround the cross flow fan 12 as described above. In this state, the cross flow fan 12 is located below the header pipes 3a and 3b. That is, when the condensed water drops from the header pipe 3, it may adhere to the cross flow fan 12 and the water drops may be scattered into the room from the outlet 13. However, in the heat exchangers 1a and 1b of the present embodiment, the linear distance W1 from the center line CL of the heat transfer tube unit 2 to the outer surface 6c of the scattering prevention fin 6b of the heat transfer tube unit 2 is the heat transfer tube unit 2. It has a shatterproof fin 6b configured to have a linear distance W2 or more from the center line CL to the outer surface 31 of the header pipe 3 in contact with the shatterproof fin 6b.

During the cooling operation, dew condensation water is deposited on the surfaces of the heat exchangers 1a and 1b. Condensation water adhering to the surface of the header pipe 3 flows on the surface of the header pipe 3 according to the inclination of the heat exchangers 1a and 1b, and is collected at the lower end of the header pipe 3. The condensed dew condensation water is transmitted to the edge 7c of the shatterproof fin 6b located further below without staying at the lower end of the header pipe 3. Since the condensed water aggregated on the edge 7c tends to move further downward, it is guided downward through the surface of the anti-scattering fin 6b continuous with the edge 7c, that is, through the outer surface 6c shown in FIG. The condensed water that has propagated on the outer surface of the scattering prevention fin 6b and has been aggregated downward is dropped onto the water tray 18 via the lower end of the header pipe 4. As described above, the condensed water generated in the heat exchangers 1a and 1b does not drip from the header pipe 3 onto the cross flow fan 12, so that it does not scatter together with the air in the room. The adjacent heat transfer tube units 2 are arranged in a staggered manner in a state of being inverted by 180 degrees, and are connected to the header pipe 3. Therefore, at one end of each heat transfer tube unit 2 in the arrangement direction, the shatterproof fins 6b and the fins 6a are alternately arranged, and the edges 7a and the edges 7c are alternately arranged. However, since the distance between the adjacent heat transfer tube units 2 is about 2 mm, the condensed water in the vicinity of the edge 7a is transmitted to either the adjacent left or right edge 7c and drops on the water tray 18.

In the present embodiment, the outer surface 6c of the scattering prevention fin 6b with respect to the outer surface 31 of the header pipe 3 guides the dew condensation water adhering to the outer surface 31 of the header pipe 3 downward, so that the heat exchangers 1a and 1b are respectively. Is configured to project within a range of zero mm or more and 2 mm or less when placed on a horizontal plane. That is, at one end in the extending direction of the center line CL of the heat transfer tube unit 2, the linear distance W1 from the center line CL of the heat transfer tube unit 2 to the outer surface 6c of the shatterproof fin 6b and the center line CL of the heat transfer tube unit 2 The linear distance W2 from the to the outer surface 31 of the header pipe 3 in contact with the shatterproof fin 6b is configured to satisfy the relationship of 2 mm ≧ (W2-W1) ≧ zero mm.

FIG. 7 shows a first embodiment of each of the heat exchangers 1a and 1b. FIG. 7 shows only one heat exchanger 1a. In FIG. 7, the heat transfer tube unit 2 is formed symmetrically with respect to the center line CL of the heat transfer tube unit 2. As for the cut shape of the tip of the fin 6, only the edges 7a and 7b that serve as stoppers when inserted into the through holes 8 of the header pipes 3 and 4 are left. In the heat exchanger 1a of FIG. 7, in a state where the heat exchanger unit 1 is arranged inside the indoor unit 10, the shatterproof fins 6b are formed in the portions where the header pipes 3 and 4 and the heat transfer tube unit 2 are in contact with each other. The outer surface 6c of the header pipe 3 is configured to be flush with respect to the outer surface 31 in the arrangement direction of the header pipe 3, that is, satisfy the relationship of W1 = W2. Also in the heat exchanger 1a of FIG. 7, the dew condensation water generated on the surface of the header pipe 3 can be guided downward through the outer surface 6c of the scattering prevention fin 6b, so that the dew condensation water can drip onto the cross flow fan 12. Absent. Therefore, the condensed water generated in each of the heat exchangers 1a and 1b is not scattered indoors.

FIG. 8 shows a second embodiment of each of the heat exchangers 1a and 1b. FIG. 8 shows only one heat exchanger 1a. In FIG. 8, the header pipe 3 has a circular cross section rather than a square shape. Also in this embodiment, in the state where the heat exchanger unit 1 is arranged inside the indoor unit 10, the outer surface 6c of the shatterproof fin 6b is in the portion where the header pipes 3 and 4 and the heat transfer tube unit 2 are in contact with each other. Is arranged below the outer surface 31 of the header pipes 3 and 4 in the vertical direction, that is, so as to satisfy the relationship of W1> W2. Also in the heat exchanger 1a of FIG. 8, the dew condensation water generated on the surface of the header pipe 3 can be guided downward through the outer surface 6c of the scattering prevention fin 6b, so that the dew condensation water can drip onto the cross flow fan 12. Absent. Therefore, the condensed water generated in each of the heat exchangers 1a and 1b is not scattered indoors.

According to the heat exchanger of the above aspect of the present invention, it is possible to provide a heat exchanger unit having high heat exchange efficiency within a limited space. Therefore, the heat exchanger of the above aspect of the present invention can be used not only for home air conditioners but also for commercial air conditioners and the like.

1 Heat exchanger unit 1a Heat exchanger 1b Heat exchanger 2 Heat transfer tube unit 3 Header pipe 3a Header pipe 3b Header pipe 4 Header pipe 4a Header pipe 4b Header pipe 5 Heat transfer tube 6 Fins 7a to 7c Edge 8 Through hole 9 Connection surface 10 Indoor unit 10a Front opening 10b Top opening 11 Front panel 12 Cross flow fan 13 Air outlet 14 Vertical wind direction changing blade 15 Left and right wind direction changing blade 18 Water receiving tray 18a Water receiving tray 18b Water receiving tray 19 Lower blade 20 Upper blade 21 Ventilation passage 22 Rear guider 23 Stabilizer 24 Side wall 26 Casing

Claims (3)

It has a plurality of heat transfer tubes for circulating a refrigerant and at least one fin extending along the extending direction of each of the plurality of heat transfer tubes to exchange heat with the refrigerant, and the plurality of heat transfer tubes and the at least the plurality of heat transfer tubes. A heat transfer tube unit in which one fin is integrally formed side by side in an arrangement direction intersecting the extending direction, and the at least one fin includes a shatterproof fin arranged at one end in the arrangement direction. When,
A hollow header pipe connected to one end of the heat transfer tube unit in the extending direction is provided.
The shatterproof fin is configured to come into contact with the outer surface of the header pipe at one end thereof.
At one end, a straight line distance from the center line of the heat transfer tube unit extending in the extending direction to the outer surface of the shatterproof fin in contact with the shatterproof fin comes into contact with the shatterproof fin. A heat exchanger configured to be greater than or equal to a linear distance to the outer surface of the header pipe. A pair of heat exchangers according to claim 1 is provided.
Each of the pair of heat exchangers
The center lines are arranged so as to intersect in the vertical direction and extend in a direction away from each other from the upper side to the lower side in the vertical direction.
A heat exchanger unit in which the shatterproof fins are arranged at the lower ends in the vertical direction of both ends of the heat transfer tube unit in the arrangement direction. The heat exchanger unit of claim 2 and
A fan arranged on the lower side of the heat exchanger unit in the vertical direction,
An indoor unit of an air conditioner, which is arranged around the fan and includes a water tray that receives dew condensation water from the pair of heat exchangers of the heat exchanger.

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