JP2013130330A - Air conditioning device, and heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning device equalizing a wind velocity distribution of airflow passing through a heat exchanger, and to provide a heat exchanger.SOLUTION: An air conditioning device includes a fin-and-tube heat exchanger 21 and a fan 22 for sending air to the heat exchanger 21 in a housing 11 thereof, wherein tubes 43 are arranged in multi-stages and a stage pitch H1 between the tubes 43 in a position closer to the fan 22 is smaller than any other stage pitches of different portions.

Description

  The present invention relates to an air conditioner including a fin-and-tube heat exchanger and a blower that blows air to the heat exchanger, and a heat exchanger.

  Generally, a horizontal suction comprising an air blower disposed at the top of the housing, and a fin-and-tube heat exchanger formed in a substantially U-shaped cross section that forms the back surface and the left and right side surfaces of the housing, A blow-out air conditioner is known (see, for example, Patent Document 1).

JP 2006-189196 A

However, in this type of air conditioner, the passing wind speed is faster at the upper position of the heat exchanger close to the blower, and the passing wind speed is lowered at other parts, particularly the lower part of the heat exchanger far from the blower. End up. As described above, when the passing wind speed becomes nonuniform in each part of the heat exchanger according to the distance from the blower, there is a problem that the heat dissipation efficiency of the heat exchanger is reduced.
This invention is made | formed in view of the situation mentioned above, and it aims at providing the air conditioning apparatus and the heat exchanger which aimed at equalization of the wind velocity distribution of the airflow which passes a heat exchanger.

  In order to achieve the above object, the present invention provides an air conditioner including a fin-and-tube heat exchanger and a blower that blows air to the heat exchanger in a casing. The tubes are arranged in multiple stages. The step pitch between the tubes is formed smaller than the step pitch in other parts at a position close to the blower.

  Further, the present invention is the above air conditioner, wherein the blower is disposed on an upper portion of the casing, and is an outdoor unit for side suction and upper blowing, wherein the step pitch at the upper portion of the heat exchanger is It is characterized in that it is formed smaller than the step pitch at the part.

  Further, the present invention provides a fin-and-tube heat exchanger in the above air conditioner, wherein the tubes are arranged in multiple stages, and the step pitch between the tubes is different from that of the blower. It is characterized in that it is formed smaller than the step pitch at the part.

  Moreover, the present invention is characterized in that, in the heat exchanger, the heat exchanger is a heat exchanger having a substantially U-shaped cross section.

  According to the present invention, in an air conditioner including a fin-and-tube heat exchanger and a blower that blows air to the heat exchanger in a casing, the tubes are arranged in multiple stages, and the space between the tubes Since the step pitch is formed smaller than the step pitch in other parts at the position close to the blower, the tube becomes a resistance of the air passing through the heat exchanger at the position close to the blower, and the passing wind speed is reduced. . Thereby, the passing wind speed from a position far from the blower having a small ventilation resistance can be increased, the wind speed distribution of the entire heat exchanger can be made uniform, and the heat exchange efficiency of the heat exchanger can be improved.

It is an external appearance perspective view of the outdoor unit of the air conditioning apparatus which shows one embodiment of this invention. It is a sectional side view of an outdoor unit. It is a top view which shows the internal structure of an outdoor unit. It is a perspective view which shows the structure of a heat exchanger. It is a figure which shows the arrangement configuration of the tube of a heat exchanger. It is the perspective view which showed the structure of the heat exchange part typically. It is a figure which shows the wind speed distribution of a heat exchanger, (A) is the table | surface which shows the step pitch between tubes with respect to the height position of a heat exchanger, and a wind speed distribution, (B) is with respect to the height position of a heat exchanger. The graph which shows the step pitch between tubes, (C) is a graph which shows the wind speed distribution with respect to the height position of a heat exchanger.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The air conditioner according to this embodiment includes an outdoor unit 10 and an indoor unit (not shown), and performs a cooling operation and a heating operation by flowing a refrigerant through a refrigerant circuit connected by a refrigerant pipe. The outdoor unit 10 is installed outside, exchanges heat with outdoor air, condenses the refrigerant during the cooling operation and releases heat to the outside air, and evaporates the refrigerant during the heating operation and takes in heat from the outside air. In addition, the directions such as up and down and left and right described below indicate directions when the outdoor unit 10 is viewed from the front side in a state where the outdoor unit 10 is installed.

FIG. 1 is an external perspective view of the outdoor unit 10, and FIG. 2 is a side sectional view of the outdoor unit 10 viewed from the right side. The outdoor unit 10 includes a unit case (housing) 11 having a substantially rectangular parallelepiped box shape, and the unit case 11 is bridged and fixed on a pair of leg members 13 and 13 extending in the front-rear direction, The bottom plate 12 includes support columns 14 extending in the vertical direction from four corners and a front panel 15.
A heat exchanger 21 to be described later is disposed on the bottom plate 12, and the back surface and the left and right side surfaces of the unit case 11 are formed by the heat exchanger 21. In addition, an outdoor fan (blower) 22 and a bell mouth 25 are arranged around the outdoor fan 22 at the upper portion of the heat exchanger 21, and an air outlet 25 A of the bell mouth 25 is connected to the outdoor fan 22. A fan guard 26 for preventing contact is disposed. A decorative panel 27 provided with a heat insulating material such as foamed polystyrene is provided around the bell mouth 25.

The front panel 15 includes an upper panel 15A and a lower panel 15B which are divided into two parts in the vertical direction. The upper panel 15A and the lower panel 15B are bridged and fixed between the columns 14 and 14 on the front side. As shown in FIG. 2, refrigerant circuit components 32 such as a compressor 30 and a valve body such as a four-way valve and an expansion valve are connected to the front side of the unit case 11 by piping. One end side of the piping of the refrigerant circuit component 32 is connected to the indoor unit via the heat exchanger 21, and the other end side of the piping of the refrigerant circuit component 32 is connected to the indoor unit. A refrigerant circuit for circulating the refrigerant is configured.
On the front side of the unit case 11, an electrical box 34 that houses a control unit for controlling various devices of the outdoor unit 10 is disposed above the compressor 30 and the like. Thereby, by removing the front panel 15, the operator can easily perform maintenance work of the compressor 30 and the control unit in the electrical box 34 from the front side.

As shown in FIG. 2, the outdoor fan 22 includes a fan motor 23 disposed above the heat exchanger 21, and a propeller fan 24 attached to the shaft of the fan motor 23. Between the support columns 14 and 14 adjacent to each other in the width direction of the unit case 11, a connecting member (not shown) that connects the support columns 14 and 14 is provided at a position corresponding to the upper end of the heat exchanger 21. It is fixed to the support frame 16 spanned between these connecting members.
When the propeller fan 24 is rotationally driven by the fan motor 23, as shown by the arrow X in the periphery of the outdoor unit 10, more specifically, in FIG. Outside air is sucked into the unit case 11 from the side and right side, and is discharged outside through the blowout opening 25 </ b> A of the bell mouth 25 provided on the upper surface of the unit case 11. That is, the outdoor unit 10 is configured as a top blowing type that blows out air after heat exchange from the top surface.

  On the bottom plate 12 of the unit case 11, as shown in FIG. 3, a heat exchanger 21 formed by being bent into a substantially U-shaped cross section is disposed. The heat exchanger 21 is arranged on the left side surface of the unit case 11. Are arranged along the back surface and the right side surface, and on both end surfaces of the heat exchanger 21 are tube plates 21A for fixing refrigerant tubes that are continuously bent in a meandering manner in the heat exchanger 21. Is provided.

  Inside the heat exchanger 21, an accumulator 35, an oil separator 36 and a receiver tank 37 that constitute a part of the refrigerant circuit together with the compressor 30 and the refrigerant circuit component 32 are arranged on the bottom plate 12. Yes. The frame 17 is fixed to the center of the upper portion of the accumulator 35. The frame 17 extends from the upper end of the accumulator 35 and is fixed to a connecting member that connects the columns 14 and 14, and prevents the accumulator 35 from swinging. ing.

  These accumulator 35, oil separator 36 and receiver tank 37 are pressure vessels for temporarily storing refrigerant or refrigerating machine oil, and have a low maintenance frequency. On the other hand, since the compressor 30 and the refrigerant circuit component 32 described above include electric elements such as a motor and a coil, the maintenance frequency is high. For this reason, in this configuration, a partition plate 38 extending upward from the bottom plate 12 to the lower end portion of the electrical box 34 is provided, and by this partition plate 38, the inside of the unit case 11 is heat exchange chamber 39 as shown in FIG. And the machine room 50. The machine room 50 accommodates the compressor 30 and the refrigerant circuit component 32 having a high maintenance frequency, and the heat exchange chamber 39 has a heat exchanger 21, an accumulator 35, an oil separator 36, and a receiver tank 37, which are less frequently maintained. Contained.

  Next, the structure of the heat exchanger 21 is demonstrated using FIG.4, FIG.5 and FIG.6. The heat exchanger 21 is configured by arranging three rows in the front-rear direction in the ventilation direction of the fin-and-tube heat exchange unit 40. Each heat exchanging unit 40 is arranged between the pair of tube plates 21A with a space between each other, a plurality of fins 41 formed in a flat plate shape, a plurality of tubes (refrigerant tubes) 43 penetrating these fins 41, (See FIG. 6).

  As shown in FIG. 4, a through hole 47 through which the tube 43 passes is formed in a predetermined position in the fin 41 of the heat exchange unit 40 in advance. The tubes 43 are parallel to each other, and a predetermined step pitch (gap) H <b> 1 is formed between the tubes 43, and the tubes 43 are arranged side by side in multiple stages. That is, the through holes 47 are formed in advance in the fins 41 so that the tubes 43 are arranged at a predetermined step pitch H1. In the heat exchanger 21, the refrigerant sent into the tube 43 and the air passing through the heat exchanger 21 are heat-exchanged via the fins 41. A U-shaped portion (U vent) 44 is provided at the end of each tube 43 (see FIG. 3), and is connected as a single refrigerant pipe by the U-shaped portion 44. Each fin 41 is formed in an elongated rectangular plate shape, and the outdoor unit 10 includes the blower 22 on the upper end side in the longitudinal direction of the fin 41.

  The outdoor unit 10 is a lateral suction, top blowing type outdoor unit, and the heat exchanger 21 is formed in a substantially U-shaped cross section that forms the back surface of the unit case 11 and the left and right side surfaces. By the way, in the outdoor unit 10 of the horizontal suction and top blowing type, air is sucked into the unit case 11 through the heat exchanger 21 by driving of the outdoor fan 22 arranged at the upper part of the heat exchanger 21. The passing wind speed at the upper position of the near unit case 11 is faster than the passing wind speed at the lower position of the unit case 11 far from the outdoor fan 22. As described above, when the passing wind speed becomes uneven at each part of the heat exchanger 21, the heat dissipation efficiency of the heat exchanger 21 is reduced.

  The present embodiment is configured to make the passing air speed uniform in each part of the heat exchanger 21, and the step pitch H 1 between the tubes 43 arranged in multiple stages of the heat exchanger 21 is set in the outdoor fan 22. In the near upper position, as shown in FIG. 5, it is formed smaller than other parts. That is, in the position near the outdoor fan 22 of the heat exchanger 21, the gap between the tubes 43 is formed more densely than the gap between the tubes 43 in other parts. According to this configuration, the tube 43 serving as the resistance of the air passing through the heat exchanger 21 is arranged at a small step pitch at a position near the outdoor fan 22 of the heat exchanger 21, and the air resistance due to the tube 43 increases. , The passing wind speed decreases. Thereby, the passing wind speed from the other site | part with small air resistance of the heat exchanger 21 becomes quick. Therefore, the passing air speed of the entire heat exchanger 21 can be made uniform, and the heat dissipation efficiency of the heat exchanger 21 can be improved.

  Thus, the heat exchanger 21 of the present application is intended to make the passing air speed of the entire heat exchanger 21 uniform, and as shown in FIG. 5, the step pitch H1 between the tubes 43 of the heat exchanger 21 is Each part of the heat exchanger 21 is variably set according to the distance from the outdoor fan 22. By making the step pitch H1 between the tubes 43 variable in each part of the heat exchanger 21, the wind speed distribution in each part of the heat exchanger 21 can be made uniform as shown in FIG. 7A is a table showing the step pitch H1 between the tubes with respect to the height position of the heat exchanger 21 and the wind speed distribution, and FIG. 7B is between the tubes with respect to the height position of the heat exchanger 21. FIG. 7C is a graph showing the wind speed distribution with respect to the height position of the heat exchanger 21.

  The heat exchanger 21 of the present embodiment is a heat exchanger having a height of 1200 mm, and the step pitch H1 between the tubes 43 is heat exchange as shown in FIGS. 8 (A) and 8 (B). The upper portion of the chamber 21 near the outdoor fan 22 is formed to be about 80% smaller than the lower portion far from the outdoor fan 22. The step pitch H1 between the tubes 43 in each part of the heat exchanger 21 depends on various conditions such as the height of the heat exchanger 21, the blowing capacity of the outdoor fan 22, the fin pitch of the fins 41, or the outer diameter of the tubes 43. The relationship between the step pitch H1 and the wind speed distribution can be verified by computer simulation or experiment, and the passing wind speed at each part of the heat exchanger 21 can be set to be uniform.

  When the step pitch H1 at each part of the heat exchanger 21 is set so that the passing air speed at each part of the heat exchanger 21 is constant, the step pitch H1 is close to the outdoor fan 22 of the heat exchanger 21. It is small at the upper position and is formed so as to gradually increase as the distance from the outdoor fan 22 increases. That is, the heat exchanger 21 is arranged such that the tubes 43 are dense at the top and sparse at the bottom. In the upper part of the heat exchanger 21 close to the outdoor fan 22, the tubes 43 are densely arranged, so that the tubes 43 provide ventilation resistance for air passing through the heat exchanger 21. In addition, in the lower part of the heat exchanger 21 that is far from the outdoor fan 22, the tubes 43 are arranged in a scattered manner, so that the ventilation resistance by the tubes 43 is reduced. Thereby, air becomes easy to be sucked in from the lower part of the heat exchanger 21 with low ventilation resistance from the upper part of the heat exchanger 21 with high ventilation resistance, and the air velocity distribution of the entire heat exchanger 21 can be made uniform. Furthermore, by making the step pitch H1 at each part of the heat exchanger 21 variable, the heat exchanger 21 passes through the wind speed at each part as shown in FIGS. 8 (A) and 8 (C). Can be made uniform, and the heat dissipation efficiency can be improved.

  As described above, according to the embodiment to which the present invention is applied, an air conditioner in which the casing 11 includes the fin-and-tube heat exchanger 21 and the blower 22 that blows air to the heat exchanger 21. In the apparatus, the tubes 43 are arranged in multiple stages, and the step pitch H <b> 1 between the tubes 43 is formed smaller than the step pitch in other parts at a position close to the blower 22. Thereby, the tube 43 is closely arranged with respect to the ventilation direction of the heat exchanger 21 at a position close to the blower 22. Therefore, the tube 43 becomes a resistance of the air passing through the heat exchanger 21, and the passing wind speed is reduced. As a result, the passing air speed from other parts of the heat exchanger 21 having a small ventilation resistance, in particular, a part far from the blower 22 can be increased, the wind speed distribution of the entire heat exchanger 21 can be made uniform, The heat exchange efficiency of the exchanger 21 can be improved.

  In addition, according to the embodiment to which the present invention is applied, the blower 22 is arranged on the upper portion of the housing 11, and is the outdoor unit 10 for side suction and upper blowing, and the step pitch H 1 on the upper portion of the heat exchanger 21 is It is formed smaller than the step pitch H1 in other parts. Thereby, the ventilation resistance of the upper part of the heat exchanger 21 close to the blower 22 can be increased, and the passing wind speed from the lower part of the heat exchanger 21 far from the blower 22 can be increased, so that the wind speed distribution of the entire heat exchanger 21 is uniform. The heat exchange efficiency of the heat exchanger 21 can be improved.

  Further, according to the embodiment to which the present invention is applied, the heat exchanger 21 is a fin-and-tube type heat exchanger 21 in which the tubes 43 are arranged in multiple stages, and the step pitch H1 between the tubes is close to the blower 22. Further, it is formed smaller than the step pitch H1 in other parts. Thereby, in the position close to the blower 22 where the passing wind speed becomes faster, the ventilation resistance is increased by the tube 43, so that the passing wind speed can be reduced. Therefore, since the passing wind speed at a position close to the blower 22 can be reduced and the passing wind speed at a position far from the blower 22 can be increased, the wind speed distribution of the entire heat exchanger 21 can be made uniform. Heat exchange efficiency can be improved.

  In addition, according to the embodiment to which the present invention is applied, the heat exchanger 21 is a heat exchanger 21 having a substantially U-shaped cross section, and therefore, the back surface and both side surfaces of the housing 11 are configured by the heat exchanger 21. In addition, since the heat exchange area can be widened, the outdoor unit 10 can be made highly efficient.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to this. In the present embodiment, the heat exchanger 21 is bent into a substantially U-shaped cross section, but may be configured to be bent into a substantially L-shaped cross section, for example. Moreover, in this embodiment, although the heat exchanger 21 forms the heat exchange part 40 in 3 rows, it is not restricted to this, The heat exchange part 40 is arbitrary row | line | columns, for example, 1 row, or multiple rows Alternatively, it may be formed side by side.

10 Outdoor unit 11 Unit case (frame)
21 Heat exchanger 22 Outdoor fan (blower)
43 tube H1 step pitch

Claims (4)

  In an air conditioner equipped with a fin and tube type heat exchanger and a blower for blowing air to the heat exchanger, the tubes are arranged in multiple rows, and the pitch between the rows of the tubes is An air conditioner characterized by being formed narrower than the inter-column pitch in other parts at a position close to the blower.   The blower is arranged at the upper part of the casing, is an outdoor unit for side suction and upper blowing, and the pitch between the rows at the top of the heat exchanger is formed narrower than the pitch between rows in other parts. The air conditioner according to claim 1, wherein A fin-and-tube heat exchanger,
The fin-and-tube type heat is characterized in that the tubes are arranged in multiple rows, and the pitch between the rows of the tubes is formed narrower than the pitch between rows in other parts at a position close to the blower. Exchanger.   The fin-and-tube heat exchanger according to claim 3, wherein the heat exchanger is a heat exchanger having a substantially U-shaped cross section.

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