JP2007147207A - Outdoor unit for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use airflow which passed through a heat exchanger as airflow for compensating lack of suction airflow to an axial fan and to substantialize both energy conservation and quietness. <P>SOLUTION: An electric box 13 incorporating an electric component is arranged on the inner face of a casing front plate 1a of a main body casing 1 composing the outdoor unit for an air conditioner. An airflow passage 14 for allowing secondary air W after flowing through the heat exchanger 4 to flow through is formed between the electric box 13 and the casing front plate 1a. By operation of the axial fan 2, the secondary air W sucked in from an air suction port 3 and passed through the heat exchanger 4 is supplied to the axial fan 2 via the airflow passage 14 formed between the casing front plate 1a and the electric box 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an outdoor unit for an air conditioner of an upper blowing type, and more particularly to an arrangement structure of an electric box in an outdoor unit for an air conditioner of an upper blowing type.

  An upper part provided with at least one axial fan disposed in the upper part of the main casing and a heat exchanger upstream of the axial fan and facing an air suction port formed on a side surface of the main casing. A blow-out type outdoor unit for an air conditioner is well known. In the case of an outdoor unit for an air conditioner having such a structure, the air suction port is not formed on all side surfaces of the main body casing. On at least one surface (namely, the front plate of the casing), an electric box having electric components is arranged.

  With the above configuration, in the casing front plate portion in which the electric box is arranged, the suction air flow is insufficient, so that the turbulence of the airflow near the blade surface of the axial fan increases and is locally localized in the circumferential direction. There is a problem that noise (that is, NZ sound) increases.

  Therefore, in order to solve the above problems, an opening is formed in the casing front plate located on the upstream side of the axial fan, and the shortage of the intake air flow to the axial fan is compensated by the intake air flow from the opening. Has been proposed (see Patent Document 1).

JP-A-11-304196.

  However, in the case of the technique disclosed in Patent Document 1, the shortage of the suction air flow to the axial fan is compensated by the suction air flow from the opening formed in the casing front plate. Since the suction air flow from the opening formed in the primary air is primary air that has not passed through the heat exchanger, a new problem arises that the capacity of the axial fan is wasted.

  The present invention has been made in view of the above points, and as an air flow to make up for the shortage of the suction air flow into the axial fan, the air flow that has passed through the heat exchanger can be used, and energy saving and quietness are achieved. It aims at making it possible to achieve both.

  In the present invention, as a first means for solving the above-described problems, at least one axial fan 2 disposed on the upper portion of the main casing 1 and the upstream side of the axial fan 2 on the main casing. In the outdoor unit for an air conditioner provided with a heat exchanger 4 opposed to the air suction port 3 formed on at least one side surface excluding the casing front plate 1a in Fig. 1, an electrical component is provided on the inner surface of the casing front plate 1a. An internal electric box 13 is arranged, and an air flow path 14 is formed between the electric box 13 and the casing front plate 1a for circulating the secondary air W after passing through the heat exchanger 4. Yes.

  By configuring as described above, the secondary air W sucked from the air suction port 3 by the operation of the axial fan 2 and passed through the heat exchanger 4 is formed between the casing front plate 1a and the electric box 13. Then, the air is supplied to the axial fan 2 via the air flow path 14. Therefore, the shortage of the suction air flow on the casing front plate 1a side is caused by the suction air flow (that is, the suction air flow supplied to the axial fan 2 via the air flow path 14 formed between the casing front plate 1a and the electric box 13). The secondary air W) that has passed through the heat exchanger is supplemented, and the increase in local noise (that is, NZ sound) due to the shortage of the suction air flow that has occurred conventionally can be effectively suppressed. it can. In addition, since the secondary air W that has passed through the heat exchanger 4 is used, the capacity of the axial fan 2 (in other words, the input of the fan motor 9) is not wasted and energy saving is reduced. It wo n’t let you. That is, both energy saving and quietness can be achieved.

  In the present invention, as a second means for solving the above problems, in the outdoor unit for an air conditioner provided with the first means, the air flow path 14 is recessed in the side surface of the electric box 13. In this case, the air flow path can be formed simply by denting the side surface of the electric box, which is advantageous in terms of cost.

  In the present invention, as a third means for solving the above problems, in the outdoor unit for an air conditioner provided with the first means, the air flow path includes the casing front plate and the electric box. It can also be formed by interposing a spacer between them, and in such a case, since the processing for the electric box becomes unnecessary, the inner volume of the electric box should be secured to the same size as before. Can do.

  In the invention of the present application, as a fourth means for solving the above-described problems, in the outdoor unit for an air conditioner including the first, second, or third means, In such a configuration, the secondary air supplied to the axial fan via the air flow path flows in an enlarged manner on the outlet side of the air flow path, and is smooth. As the flow is obtained, the secondary air W is supplied to a wider range of the outer peripheral ends of the blades 7, 7,... In the axial fan, and the increase in local noise (ie, NZ sound) is more effective. Can be suppressed.

  In the present invention, as a fifth means for solving the above problems, in the outdoor unit for an air conditioner provided with the first, second, third or fourth means, The heat radiation fins 16 can be provided on the electric box 13 side. In such a case, heat generated in the electric box 13 is radiated to the secondary air W side flowing through the air flow path 14 via the heat radiation fins 16. As a result, the temperature rise in the electric box 13 can be effectively suppressed.

  According to the first means of the present invention, at least one axial fan 2 disposed in the upper portion of the main casing 1 and the casing front plate 1a in the main casing 1 upstream of the axial fan 2 are provided. In the outdoor unit for an air conditioner provided with a heat exchanger 4 facing the air suction port 3 formed on at least one side excluding the electric box, an electric box 13 in which electric parts are installed on the inner surface of the casing front plate 1a is provided. The air flow path 14 for circulating the secondary air W after passing through the heat exchanger 4 is formed between the electric box 13 and the casing front plate 1a. The secondary air W sucked from the air suction port 3 by the operation and passed through the heat exchanger 4 is supplied to the axial fan 2 through the air flow path 14 formed between the casing front plate 1a and the electric box 13. Because it was made The shortage of the suction air flow on the casing front plate 1a side is caused by the suction air flow (i.e., heat) supplied to the axial fan 2 via the air flow path 14 formed between the casing front plate 1a and the electric box 13. The secondary air W) that has passed through the exchanger can be supplemented, and the increase in local noise (that is, NZ sound) caused by the shortage of the suction air flow that has occurred conventionally can be effectively suppressed. There is an effect that energy saving and quietness can both be achieved without wastefully using the capacity of the axial fan 2 (in other words, the input of the fan motor 9).

  As in the second means of the present invention, in the outdoor unit for an air conditioner provided with the first means, the air flow path 14 is recessed in the side surface of the electric box 13 on the casing front plate 1a side. In such a configuration, the air flow path 14 can be formed simply by denting the side surface of the electric box 13, which is advantageous in terms of cost.

  As in the third means of the present invention, in the outdoor unit for an air conditioner including the first means, the air flow path 14 is arranged between the casing front plate 1a and the electric box 13 with a spacer 17. In such a case, since the processing for the electric box 13 becomes unnecessary, the inner volume of the electric box 13 can be secured to the same size as that of the conventional case. .

  As in the fourth means of the present invention, in the outdoor unit for an air conditioner provided with the first, second or third means, the outlet of the air flow path 14 may be expanded inward. In such a configuration, the secondary air W supplied to the axial flow fan 2 via the air flow path 14 expands and flows on the outlet side of the air flow path 14, and a smooth flow is obtained. In addition, the secondary air W is supplied to a wider range of the outer peripheral ends of the blades 7, 7,... In the axial fan 2, and the increase in local noise (that is, NZ sound) is more effectively achieved. Can be suppressed.

  As in the fifth means of the present invention, in the outdoor unit for an air conditioner provided with the first, second, third or fourth means, heat is radiated to the electric box 13 side in the air flow path 14. The fin 16 can also be provided. In such a configuration, the heat generated in the electric box 13 is radiated to the secondary air W side flowing through the air flow path 14 via the heat radiating fins 16. The internal temperature rise can be effectively suppressed.

  The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

First Embodiment FIGS. 1 to 3 show an outdoor unit for an air conditioner according to a first embodiment of the present invention.

  The outdoor unit for an air conditioner includes an axial fan 2 disposed on an upper portion of a main casing 1 having a rectangular cross section, and a casing front plate 1a in the main casing 1 on the upstream side of the axial fan 2. And a heat exchanger 4 having a U-shaped cross section opposed to the air suction ports 3, 3 and 3 formed on the three side surfaces. The compressor and the like are not shown. In this case, the main body casing 1 has a rectangular shape with a transverse width larger than the depth. Reference numeral 5 denotes a column that is erected at the corner of the main casing 1.

  The axial fan 2 includes, for example, an impeller 8 in which four blades 7, 7... Are radially attached to the outer periphery of a cylindrical boss 6, and a fan motor 9 that rotationally drives the impeller 8. The fan motor 9 is disposed above the main body casing 1 by being supported by the motor base stays 10 and 10 above the heat exchanger 4. Reference numeral 11 is a bell mouth constituting the air outlet, and 12 is a fan guard covering the air outlet.

  An electrical box 13 having an electrical component (not shown) is disposed at a position close to one side on the inner surface of the casing front plate 1a, and between the electrical box 13 and the casing front plate 1a. The air flow path 14 for circulating the secondary air W after passing through the heat exchanger 4 is formed over the entire length of the electric box 13 in the vertical direction. In this case, the air flow path 14 is formed by denting the side surface of the electric box 13 (that is, the side surface on the casing front plate 1a side). The electrical box 13 is a slope that approaches the casing front plate 1a side as the side surface 13a on the side opposite to the casing front plate is directed upward. By doing so, the suction area to the axial fan 2 can be enlarged. Reference numeral 15 denotes a stay laid between the support columns 5 and 5 to support the electric box 13, and the support portion 15 a of the electric box 13 in the stay 15 does not block the inlet of the air flow path 14. It is bent.

  In the outdoor unit for an air conditioner configured as described above, the following operational effects are obtained.

  The air flow path 14 formed between the casing front plate 1a and the electric box 13 is the secondary air W sucked from the air suction ports 3, 3, 3 by the operation of the axial fan 2 and passed through the heat exchanger 4. It will be supplied to the axial fan 2 via. Therefore, the shortage of the suction air flow on the casing front plate 1 side is caused by the suction air flow (that is, the suction air flow supplied to the axial fan 2 via the air flow path 14 formed between the casing front plate 1a and the electric box 13 (that is, The secondary air W) that has passed through the heat exchanger is supplemented, and the increase in local noise (that is, NZ sound) due to the shortage of the suction air flow that has occurred conventionally can be effectively suppressed. it can. In addition, since the secondary air W that has passed through the heat exchanger 4 is used, the capacity of the axial fan 2 (in other words, the input of the fan motor 9) is not wasted and energy saving is reduced. It wo n’t let you. That is, both energy saving and quietness can be achieved.

  Moreover, since the air flow path 14 can be formed only by denting the side surface of the electric box 13, it is advantageous in terms of cost.

Second Embodiment FIGS. 4 and 5 show an outdoor unit for an air conditioner according to a second embodiment of the present invention.

  In this case, the outlet of the air flow path 14 is expanded inward by forming an inclined surface 14 a that inwardly slopes toward the upper surface side of the electrical box 13. In this way, the secondary air W supplied to the axial fan 2 via the air passage 14 expands and flows on the outlet side of the air passage 14, and a smooth flow is obtained. The secondary air W is also supplied to the outer peripheral ends of the blades 7, 7,... In the flow fan 2, and the increase in local noise (that is, NZ sound) can be more effectively suppressed.

  Further, in the present embodiment, a large number of radiating fins 16 are provided on the side of the electric box 13 in the air flow path 14. Each of the radiating fins 16 is integrally projected from the electric box 13 in the middle of the air flow path 14. If it does in this way, the heat which arises in the electrical box 14 will be radiated by the secondary air W side which flows through the air flow path 14 via the radiation fins 16, 16, ..., and the temperature rise in the electrical box 13 is effective. Can be suppressed.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Third Embodiment FIGS. 6 and 7 show an air conditioner outdoor unit according to a third embodiment of the present invention.

  In this case, the air flow path 14 is formed by providing a pair of spacers 17 and 17 between the casing front plate 1 a and the electric box 13. The spacers 17 and 17 are preferably interposed over the entire length of the electrical box 13 in the vertical direction. If it does in this way, since the process with respect to the electric box 13 becomes unnecessary, the internal volume of the electric box 13 can be ensured to the magnitude | size equivalent to the past.

  Also in the present embodiment, the outlet of the air flow path 14 is expanded inward by forming an inclined surface 14 a that is inclined inward toward the upper surface side of the electric box 13. In this way, the secondary air W supplied to the axial fan 2 via the air passage 14 expands and flows on the outlet side of the air passage 14, and a smooth flow is obtained. The secondary air W is supplied to a wider range of the outer peripheral ends of the blades 7, 7,... In the flow fan 2, and the increase in local noise (that is, NZ sound) can be suppressed more effectively. it can.

  Further, also in the present embodiment, a large number of radiating fins 16 are provided on the air flow path 14 on the side of the electric box 13. Each of the radiating fins 16 is integrally projected from the electric box 13 in the middle of the air flow path 14. If it does in this way, the heat which arises in the electrical box 14 will be radiated by the secondary air W side which flows through the air flow path 14 via the radiation fins 16, 16, ..., and the temperature rise in the electrical box 13 is effective. Can be suppressed.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

Fourth Embodiment FIG. 8 shows an outdoor unit for an air conditioner according to a fourth embodiment of the present invention.

In this case, a pair of axial fans 2 and 2 are disposed on the upper portion of the main casing 1. Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted. Fifth Embodiment FIGS. 9 and 10 show an outdoor unit for an air conditioner according to a fifth embodiment of the present invention.

  In this case, the main body casing 1 has a rectangular cross-sectional shape whose depth is greater than the lateral width, and the electric box 13 is disposed at the center in the width direction of the casing front plate 1a. And between the electric box 13 and the casing front board 1a, the air flow path 14 which distribute | circulates the secondary air W after passing the said heat exchanger 4 is formed over the full length of the electric box 13 in the up-down direction. ing. In this case, the air flow path 14 is formed by denting the side surface of the electric box 13 (that is, the side surface on the casing front plate 1a side). A side surface 13a on the side opposite to the casing front plate in the electric box 13 is a vertical surface.

  By the way, when the electric box 13 is arranged at the center in the width direction of the casing front plate 1a, the overlapping portion of the electric box 13 and the blades 7, 7,. Insufficient suction air flow becomes significant, but as in the present embodiment, the air flow through which the secondary air W after passing through the heat exchanger 4 is circulated between the electric box 13 and the casing front plate 1a. Effects when the path 14 is formed over the entire length of the electric box 13 (that is, the suction air generated on the casing front plate 1a side by the suction air flow supplied to the axial fan 2 via the air flow path 14) The effect that the lack of flow is compensated) becomes more effective.

  Further, the outlet of the air flow path 14 is expanded inward by forming an inclined surface 14 a that inwardly slopes toward the upper surface side of the electric box 13. In this way, the secondary air W supplied to the axial fan 2 via the air passage 14 expands and flows on the outlet side of the air passage 14, and a smooth flow is obtained. The secondary air W is also supplied to the outer peripheral ends of the blades 7, 7,... In the flow fan 2, and the increase in local noise (that is, NZ sound) can be more effectively suppressed.

  Further, also in the present embodiment, a large number of radiating fins 16 are provided on the air flow path 14 on the side of the electric box 13. Each of the radiating fins 16 is integrally projected from the electric box 13 in the middle of the air flow path 14. If it does in this way, the heat which arises in the electrical box 14 will be radiated by the secondary air W side which flows through the air flow path 14 via the radiation fins 16, 16, ..., and the temperature rise in the electrical box 13 is effective. Can be suppressed.

  Also in the present embodiment, an air flow path may be formed by interposing a spacer between the casing front plate and the electric box.

  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.

  In each of the above embodiments, the description has been given of the case in which the air suction port is formed on the three side surfaces excluding the casing front plate. Is applicable. Moreover, although the thing of the cross-sectional U shape was demonstrated as a heat exchanger, the heat exchanger can also be arrange | positioned for every air suction inlet. Furthermore, the number of axial fans can be one or more.

  The present invention is not limited to the above-described embodiments, and it goes without saying that the design can be changed as appropriate without departing from the scope of the invention.

It is the top view which removed the fan guard of the outdoor unit for air conditioners concerning 1st Embodiment of this invention. It is II-II sectional drawing of FIG. It is III-III sectional drawing of FIG. It is the top view which removed the fan guard of the outdoor unit for air conditioners concerning the 2nd Embodiment of this invention. It is VV sectional drawing of FIG. It is the top view which removed the fan guard of the outdoor unit for air conditioners concerning the 3rd Embodiment of this invention. It is VII-VII sectional drawing of FIG. It is the top view which removed the fan guard of the outdoor unit for air conditioners concerning the 4th Embodiment of this invention. It is the top view which removed the fan guard of the outdoor unit for air conditioners concerning the 5th Embodiment of this invention. It is XX sectional drawing of FIG.

Explanation of symbols

1 is a main body casing 1a is a casing front plate 2 is an axial fan 3 is an air suction port 4 is a heat exchanger 8 is an impeller 9 is a fan motor 13 is an electric box 14 is an air flow path 14a is an inclined surface 16 is a radiating fin 17 Is the spacer W is the secondary air

Claims (5)

At least one axial fan (2) disposed on the upper part of the main casing (1), and a casing front plate (1a) on the upstream side of the axial fan (2) in the main casing (1) An air conditioner outdoor unit comprising a heat exchanger (4) opposed to an air suction port (3) formed on at least one side of the casing, wherein an inner surface of the casing front plate (1a) An electric box (13) in which components are installed is disposed, and secondary air (after passing through the heat exchanger (4)) is interposed between the electric box (13) and the casing front plate (1a). An air conditioner outdoor unit characterized in that an air flow path (14) through which W) flows is formed. The outdoor unit for an air conditioner according to claim 1, wherein the air flow path (14) is formed by denting a side surface of the electric box (13) on the casing front plate (1a) side. The air according to claim 1, wherein the air flow path (14) is formed by interposing a spacer (17) between the casing front plate (1a) and the electric box (13). Outdoor unit for harmony machine. The outdoor unit for an air conditioner according to any one of claims 1, 2, and 3, wherein an outlet of the air flow path (14) is expanded inward. The air conditioner according to any one of claims 1, 2, 3 and 4, wherein a radiation fin (16) is provided on the electric flow path (14) on the electric box (13) side. Outdoor unit.

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