JP4049054B2 - Scroll casing of centrifugal blower, centrifugal blower provided with the same, and indoor unit of air conditioner - Google Patents

Description

  The present invention relates to a scroll casing of a centrifugal blower, a centrifugal blower provided with the same, and an assembling method thereof, in particular, a centrifugal blower that is arranged in a blower casing having a blower suction port and a blower blower outlet to constitute the blower. The present invention relates to a scroll casing, a centrifugal fan provided with the scroll casing, and an assembly method thereof. The present invention also relates to an indoor unit of an air conditioner, and more particularly to an indoor unit of an air conditioner in which a space in a unit casing is partitioned into a blower chamber and a heat exchanger chamber by a partition plate having an opening.

  As a centrifugal blower incorporated in an indoor unit of an air conditioner having a duct structure or the like, there is one provided with a scroll casing, an impeller disposed in the scroll casing, and an electric motor that rotationally drives the impeller. Such a centrifugal blower is disposed in a substantially box-shaped unit casing constituting the indoor unit. The unit casing has a unit suction port on the lower surface or the rear surface, a centrifugal fan is disposed and functions as a blower for the indoor unit, and a unit casing is provided by the centrifugal blower having a unit outlet on the front surface. And a heat exchanger chamber in which a heat exchanger for exchanging heat of the air taken in is disposed. These two chambers are formed by being partitioned forward and backward by a partition plate arranged in the unit casing. And the scroll casing of a centrifugal blower is arrange | positioned so that a scroll inlet may turn sideways, and a scroll blower outlet may correspond to the opening formed in the partition plate. That is, the opening of the partition plate functions as a blower outlet of the blower.

  In this indoor unit, when the centrifugal blower is driven, air is taken into the blower chamber as the blower from the unit suction port, and is sucked into the scroll casing via the scroll suction port, and is then outer peripheral side of the impeller by the impeller. Is blown out. The air that has been blown to the outer peripheral side of the impeller and increased in pressure is blown into the heat exchanger chamber from the scroll outlet of the scroll casing disposed so as to correspond to the opening of the partition plate as the unit outlet of the blower. Then, when passing through the heat exchanger, heat is exchanged with the refrigerant flowing in the heat transfer tubes of the heat exchanger to be heated or cooled. Then, the air heated or cooled by the heat exchanger is blown out into the air-conditioned room via the unit outlet (see, for example, Patent Document 1).

  By the way, in such an indoor unit, in consideration of workability when the centrifugal blower is incorporated in the unit casing, a scroll lower member (first scroll member) having a tongue portion and a scroll lower member are attached to the scroll casing. A centrifugal blower including a scroll casing having a structure that can be divided into a scroll upper member (second scroll member) to be configured may be used (for example, see Patent Document 2).

  Below, the assembly operation | work to the unit casing of this centrifugal blower is demonstrated. First, it is arranged on the work table so that the upper surface of the casing body in the state where the casing lid member mainly constituting the lower surface of the unit casing is not mounted is on the lower side, the partition plate is mounted on the casing body, and the fan chamber and A heat exchanger chamber is formed. Next, the scroll upper member constituting the scroll casing of the centrifugal blower is disposed so that the end on the partition plate side corresponds to the opening of the partition plate, and is fixed to the casing body or the partition plate. Next, the assembly in which the impeller and the electric motor are connected via the shaft is arranged so that the impeller is arranged in the scroll casing, and the electric motor is fixed to the casing body or the partition plate. Next, the scroll casing is assembled by arranging the end of the scroll lower member on the partition plate side so as to correspond to the opening of the partition plate and mounting the scroll lower member on the scroll upper member. Finally, the indoor unit is completed by attaching a casing lid member to the casing body. In this way, the centrifugal fan is incorporated into the unit casing.

However, in the centrifugal blower incorporated in this way, since the partition plate and the scroll casing are separate, there is a gap between the members at the position of the opening of the partition plate (that is, the blower outlet of the blower). Can be done. For this reason, the pressure in the heat exchanger chamber is higher than the pressure in the blower chamber because part of the air that has been boosted by the blower work of the centrifugal blower and blown out from the scroll outlet of the scroll casing to the heat exchanger chamber is Since the air flows back to the blower chamber side through the gap between the partition plate and the scroll casing, the air blowing performance is deteriorated. For this reason, it is necessary to improve the sealing performance between the partition plate and the scroll casing at the position of the opening of the partition plate. On the other hand, after mounting the scroll lower member to the scroll upper member, it is conceivable to perform a countermeasure such as separately mounting a seal member for filling the gap between the scroll casing and the partition plate, The number of man-hours for assembling the scroll casing into the unit casing increases, and workability is impaired.
JP-A-2-110219 JP 2000-283094 A

  An object of the present invention is to provide, as a blower casing, a scroll casing of a centrifugal blower having a structure that can be divided into a first scroll member having a tongue and a second scroll member that is mounted with the first scroll member and forms a scroll casing. In the air blower configured by being incorporated, the amount of the air blown out from the air blower outlet through the scroll casing back into the air blower casing is reduced without impairing the workability of the assembling work.

A scroll casing of a centrifugal blower according to claim 1 is a scroll casing of a centrifugal blower that is arranged in a blower casing having a blower inlet and a blower outlet and constitutes the blower, and the first scroll. A member and a second scroll member are provided. The first scroll member has a tongue portion and a first end portion formed on the blower outlet side of the tongue portion so as to correspond to a part of the blower outlet. The second scroll member is formed so as to correspond to a portion other than the portion corresponding to the first end of the blower outlet, and constitutes a scroll outlet for blowing out air in the scroll casing together with the first end. It has a second end and a first scroll member is attached to form a scroll casing. The first scroll member has a backflow prevention portion that is formed at the first end and abuts on a part of the peripheral edge of the blower outlet when mounted on the second scroll member. And the backflow prevention part is arrange | positioned so that it may contact | abut on the outer surface of an air blower casing. Moreover, the 2nd scroll member has a clamping part provided so that a part of peripheral part of an air blower blower outlet might be pinched | interposed between a backflow prevention part.

  In the scroll casing of the centrifugal blower, when the first scroll member is mounted on the second scroll member, the first scroll member is in contact with a part of the peripheral portion of the blower outlet at the first end of the first scroll member. Since the backflow prevention part which touches is provided, without impairing workability | operativity at the time of incorporating a scroll casing in an air blower casing, the peripheral part of the 1st edge part of a 1st scroll member, and the air blower blower outlet of an air blower casing It is possible to improve the sealing performance between a part of the parts. Thereby, it becomes possible to reduce the amount of the air blown out from the scroll outlet through the scroll casing and back into the blower casing, and the deterioration of the blowing performance can be prevented.

And since the backflow prevention part is arrange | positioned so that the backflow prevention part may contact | abut the outer surface of an air blower casing, the scroll casing of this centrifugal blower can be integrated in an air blower casing in the following procedures. First, the second end of the second scroll member is disposed at a corresponding portion of the blower outlet of the blower casing, and then the impeller constituting the centrifugal blower is disposed at a predetermined position of the second scroll member. And, after inserting the first end of the first scroll member into the blower outlet while avoiding interference with the impeller, by attaching to the second scroll member to turn the first scroll member, Complete the scroll casing. At this time, the backflow prevention unit is swung with the swivel operation of the first scroll member outside the blower casing and comes into contact with a part of the peripheral edge of the blower blower outlet. The sealing performance between the first end of the first scroll member and the portion provided with the blower outlet of the blower casing can be improved without hindering the work of mounting the one scroll member. Thus, even if it is a case where a scroll casing is assembled | attached to a 2nd scroll member so that a 1st scroll member may be rotated, the 1st edge part of a 1st scroll member and the blower blower outlet of a blower casing It is possible to improve the sealing performance between the peripheral part of the two. Thereby, it becomes possible to reduce the amount of the air blown out from the scroll outlet through the scroll casing and back into the blower casing, and the deterioration of the blowing performance can be prevented.

Moreover, in the scroll casing of this centrifugal blower, when the first scroll member is attached to the second scroll member and the backflow prevention part is brought into contact with a part of the peripheral edge of the blower outlet on the outside of the blower casing. A part of the peripheral edge of the blower outlet of the blower casing is sandwiched between the sandwiching part provided on the second scroll member. Thereby, since close_contact | adherence with a part of peripheral part of the air blower blower outlet of a blower casing and a backflow prevention part becomes favorable, the periphery of the 1st edge part of a 1st scroll member and the air blower blower outlet of a blower casing The sealing performance between a part of the parts can be improved.

  A scroll casing for a centrifugal blower according to a second aspect of the present invention is the scroll casing according to the first aspect, wherein the second scroll member has a flange portion formed at the second end portion. The flange part is in contact with the peripheral part of the blower outlet other than the peripheral part of the blower outlet in contact with the backflow prevention part.

  In the scroll casing of the centrifugal blower, the second end of the second scroll member is blown by a portion other than the peripheral portion of the blower outlet where the backflow prevention portion provided at the first end of the first scroll member abuts. Since it has the flange part contact | abutted to the peripheral part of an apparatus blower outlet, the part corresponding to the 2nd end part of a 2nd scroll member and the 2nd end part of the peripheral part of the blower blower outlet of an air blower casing Sealability can be improved. Thereby, the quantity by which the air which blows off from a scroll blower outlet through a scroll casing flows backward in an air blower casing can be further reduced.

The centrifugal blower according to claim 3 is a centrifugal blower that is arranged in a blower casing having a blower suction port and a blower blower outlet and constitutes the blower, and the scroll according to claim 1 or 2. A casing, an impeller disposed in the scroll casing, and an electric motor that rotationally drives the impeller are provided.

  In this centrifugal blower, the scroll casing has a structure that can be divided into a first scroll member having a tongue and a second scroll member to which the first scroll member is attached. And the backflow prevention part which contact | abuts a part of peripheral part of an air blower blower outlet in the state with which the 1st scroll member was mounted | worn with the 2nd scroll member is formed in the 1st end part of the 1st scroll member. Therefore, the seal between the first end of the first scroll member and a part of the peripheral edge of the blower outlet of the blower casing without impairing the workability when the scroll casing is incorporated in the blower casing. Can increase the sex. Thereby, it becomes possible to reduce the amount of the air blown out from the scroll outlet through the scroll casing and back into the blower casing, and the deterioration of the blowing performance can be prevented.

The indoor unit of the air conditioner according to claim 4 includes a substantially box-shaped unit casing, a partition plate, a first scroll member, a second scroll member, an impeller, an electric motor, and a heat exchanger. I have. The unit casing has a unit inlet and a unit outlet. The partition plate is provided in the unit casing, and partitions the space in the unit casing into a fan chamber communicated with the unit inlet and a heat exchanger chamber communicated with the unit outlet. The first scroll member has a tongue portion and a first end portion formed on the partition plate side of the tongue portion so as to correspond to a part of the opening of the partition plate, and is provided in the blower chamber. The second scroll member is formed so as to correspond to a portion other than the portion corresponding to the first end portion of the opening of the partition plate, and constitutes a scroll outlet for blowing air into the heat exchanger chamber together with the first end portion. The first scroll member is mounted to form a scroll casing, and is provided in the blower chamber. The impeller is disposed in the scroll casing. The electric motor rotationally drives the impeller. The heat exchanger is disposed in the heat exchanger chamber and includes a heat exchanger for exchanging heat of air taken into the unit casing. The first scroll member has a backflow prevention portion that is formed at the first end and abuts against a part of the peripheral edge of the opening of the partition plate when attached to the second scroll member. And the backflow prevention part is arrange | positioned so that the surface at the side of the heat exchanger room of a partition plate may be contact | abutted. In addition, the second scroll member has a sandwiching portion provided so as to sandwich a part of the peripheral edge of the opening of the partition plate between the backflow preventing portion.

  In the indoor unit of the air conditioner, the scroll casing has a structure that can be divided into a first scroll member having a tongue and a second scroll member to which the first scroll member is attached. And the backflow prevention part which contact | abuts a part of peripheral part of opening of a partition plate in the state with which the 1st scroll member was mounted | worn with the 2nd scroll member is formed in the 1st end part of the 1st scroll member. Therefore, it is possible to improve the sealing performance between the first end of the first scroll member and a part of the peripheral edge of the opening of the partition plate without impairing the workability when the scroll casing is incorporated in the unit casing. it can. Thereby, it becomes possible to reduce the amount of the air blown out from the scroll outlet through the scroll casing into the heat exchanger chamber and back into the blower chamber, thereby preventing the deterioration of the blowing performance.

  As described above, according to the present invention, the following effects can be obtained.

In the invention which concerns on Claim 1, without impairing workability | operativity at the time of incorporating a scroll casing in an air blower casing, a part of peripheral part of the 1st edge part of a 1st scroll member and the air blower blower outlet of an air blower casing The sealing property between the two can be improved. Thereby, it becomes possible to reduce the amount of the air blown out from the scroll outlet through the scroll casing and back into the blower casing, and the deterioration of the blowing performance can be prevented. And in this invention, even if it is a case where a scroll casing is assembled | attached to a 2nd scroll member so that a 1st scroll member may be rotated, the 1st edge part of a 1st scroll member and the air blower of an air blower casing The sealing property between a part of the peripheral part of the blower outlet can be improved. Thereby, it becomes possible to reduce the amount of the air blown out from the scroll outlet through the scroll casing and back into the blower casing, and the deterioration of the blowing performance can be prevented. Moreover, in this invention, since close_contact | adherence with a part of peripheral part of the blower outlet of a blower casing and a backflow prevention part becomes favorable, the 1st edge part of a 1st scroll member and the blower blower of a blower casing are good. The sealing performance between the part provided with the outlet can be improved.

  In the invention concerning Claim 2, the sealing performance of the peripheral part other than the peripheral part corresponding to the 2nd end part of a 2nd scroll member and the 1st end part of the air blower blower outlet of an air blower casing can be improved. Thereby, the quantity by which the air which blows off from a scroll blower outlet through a scroll casing flows backward in an air blower casing can be further reduced.

In the invention concerning Claim 3 , without impairing workability | operativity at the time of incorporating a scroll casing in an air blower, with the 1st edge part of a 1st scroll member, and a part of peripheral part of the air blower blower outlet of an air blower casing It is possible to improve the sealing performance. Thereby, it becomes possible to reduce the amount of the air blown out from the scroll outlet through the scroll casing and back into the blower casing, and the deterioration of the blowing performance can be prevented.

In the invention concerning Claim 4 , without impairing workability | operativity at the time of incorporating a scroll casing in a unit casing, between the 1st edge part of a 1st scroll member, and a part of peripheral part of opening of the partition plate of a unit casing It is possible to improve the sealing performance. Thereby, it becomes possible to reduce the amount of the air blown out from the scroll outlet through the scroll casing into the heat exchanger chamber and back into the blower chamber, thereby preventing the deterioration of the blowing performance.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a scroll casing of a centrifugal blower according to the present invention, a centrifugal blower including the same, an assembling method thereof, and an indoor unit of an air conditioner will be described based on the drawings.

[First Embodiment]
(1) Overall structure of indoor unit FIGS. 1 and 2 show an embodiment of a scroll casing of a centrifugal blower according to the present invention, a centrifugal blower including the same, an assembling method thereof, and an indoor unit of an air conditioner. 2 is a plan view (illustrated with the upper surface of the unit casing removed) and a side view (viewed in the direction of arrow A in FIG. 1) showing the indoor unit 1. This indoor unit 1 has a duct structure arranged in the space behind the ceiling of the air conditioning room. This indoor unit 1 is connected to an outdoor unit (not shown) disposed outside through a refrigerant communication pipe (not shown).

  The indoor unit 1 mainly includes a substantially box-shaped unit casing 2, a blower 3, a heat exchanger 5, and an electrical component box 6.

<Unit casing>
The unit casing 2 is a member for storing the blower 3, the heat exchanger 5 and the electrical component box 6 therein, and is mainly a casing body whose bottom surface 2 a (surface on the back side in FIG. 1) is open. 21 and a casing lid member 22 disposed so as to cover the casing body 21 from below.

The unit casing 2 has a blower chamber S ₁ having unit suction ports 2g and 2h on the lower surface 2a and rear surface 2b (the upper surface in FIG. 1), and a front surface 2c (in FIG. 1). A heat exchanger chamber S ₂ having a unit outlet 2 i and a heat exchanger 5 is formed on the lower surface of the drawing. The unit suction ports 2g and 2h can be selected and used according to the installation conditions in the space behind the ceiling. The blower chamber S ₁ and the heat exchanger chamber S ₂ are formed by being partitioned forward and backward by a partition plate 23 disposed in the unit casing 2. The partition plate 23 is formed with three openings 23a to 23c formed so as to correspond to the respective scroll outlets 35a to 35c (described later) of the three scroll casings 31a to 31c constituting the blower 3. .

<Blower device>
Blower 3 is disposed on the blower chamber S _1, the unit suction port 2g, by sucking air in the blower chamber S ₁ from 2h to boost heat exchange through the aperture 23a~23c of the partition plate 23 a device for blowing in vessel chamber S _2. For this reason, it can be said that the part corresponding to the blower chamber S ₁ of the unit casing 2 and the partition plate 23 constitute a blower casing of the blower 3. Moreover, it can be said that the openings 23 a to 23 c of the partition plate 23 constitute a blower outlet of the blower 3.

  In the present embodiment, the blower 3 includes three scroll-shaped scroll casings 31a to 31c, impellers 32a to 32c disposed in the scroll casings 31a to 31c, and an electric motor that rotationally drives the impellers 32a to 32c. 33.

  Each of the scroll casings 31a to 31c blows air in a direction intersecting the scroll suction ports 34a to 34c and the scroll suction ports 34a to 34c formed on both side surfaces thereof in order to constitute a double suction centrifugal blower. The scroll outlets 35a to 35c are formed. The scroll casings 31a to 31c are respectively provided in openings 23a to 23c formed in the partition plate 23 so that the scroll inlets 34a to 34c face the side of the unit casing 2 and the scroll outlets 35a to 35c are formed in the partition plate 23, respectively. Correspondingly, the unit casings 2 are arranged in order from the left side surface 2d (the left side surface in FIG. 1) to the right side surface 2e (the right side surface in FIG. 1). Each of the three scroll casings 31a to 31c has a structure that can be divided in the vertical direction in the unit casing 2, and the detailed structure thereof will be described later.

  In this embodiment, the impellers 32a to 32c are impellers for a double suction centrifugal blower, and are arranged in the scroll casings 31a to 31c. In addition, although there are three impellers and scroll casings in this embodiment, it is not limited to this, and may be one, two, or four or more. Moreover, although the impeller and the scroll casing are the double suction type in the present embodiment, they may be a single suction type.

  In the present embodiment, the electric motor 33 is disposed between the scroll casings 31b and 31c in a plan view of the unit casing 2, and is fixed to the partition plate 23 and the casing main body 21 via the support member 33a. The shaft 33b of the electric motor 33 extends from the left side surface 2d (the left side surface in FIG. 1) of the unit casing 2 toward the right side surface 2e (the right side surface in FIG. 1), and the impellers 32a to 32c are connected to each other. It is pivotally supported. The end portion on the left side surface of the shaft 33b is supported on the left side surface 2d of the unit casing 2 via a bearing 33c.

Thus, when driving the blower 3, the unit inlet 2 g, 2h air is taken into the blower chamber S ₁ from air taken is sucked into each scroll casing 31a~31c through scroll inlet 34a~34c The impellers 32a to 32c are blown out to the outer peripheral sides of the impellers 32a to 32c. And the air blown up to the outer peripheral side of the impellers 32a-32c and pressure | voltage-rised is the scroll blower outlet 35a-35c of each scroll casing 31a-31c arrange | positioned so as to correspond to each opening 23a-23c of the partition plate 23. It adapted to be blown into the heat exchanger chamber S within ₂ from.

<Heat exchanger>
Heat exchanger 5 is disposed in the heat exchanger chamber S _2, blower chamber S heat exchanger chamber is boosted from the scroll outlet 35a~35c of each scroll casing 31a~31c by blower 3 in the ₁ the air blown into the S ₂ is a device for heat exchange. In this embodiment, the heat exchanger 5 is a cross fin tube type heat exchanger, and is disposed so as to be inclined obliquely. And the drain pan 2j is arrange | positioned under the heat exchanger 5, and the dew condensation water which generate | occur | produced in the heat exchanger 5 can be received now.

Thus, the air blown into the heat exchanger chamber S within ₂ from the scroll outlet 35 a - 35 c, is cooled or heated by performing heat exchange with the refrigerant flowing through the heat transfer tube of the heat exchanger 5, the unit blow The air is blown out from the outlet 2i into the air conditioned room.

<Electrical component box>
The electrical component box 6 mainly stores various electrical components including a control P plate for controlling the operation of the indoor unit 1, and is disposed in the unit casing 2. In the present embodiment, the electrical component box 6, the right side surface 2e side of the unit casing 2 in the blower chamber S _1, and is disposed adjacent to the scroll casing 31c.

(2) Structure of scroll casing Next, the detailed structure of the scroll casings 31a-31c is demonstrated using FIGS. Since the three scroll casings 31a to 31c have the same shape in this embodiment, the scroll casing 31a will be described as a representative of the three scroll casings, and the scroll casings 31b and 31c will be described here. The description about is omitted. Here, FIG. 3 is a cross-sectional view taken along the line BB in FIG. 1 (shown excluding the unit casing 2). 4 is a cross-sectional view taken along the line CC of FIG. FIG. 5 is a view taken in the direction of arrow D in FIG. 6 is a cross-sectional view taken along line EE in FIG.

  In this embodiment, the scroll casing 31a is a resin member, and a scroll lower member 41 (first scroll member) that covers the impeller 32a from below and a scroll upper member 42 (second scroll) that covers the impeller 32a from above. Scroll member).

The scroll lower member 41 constitutes a lower portion of the scroll casing 31a, and the first end portion formed to correspond to a part of the opening 23a on the tongue portion 41a and the partition plate 23 side of the tongue portion 41a. 41b. Here, the opening 23a of the partition plate 23 is a slightly horizontally long rectangular hole in the present embodiment. In the present embodiment, the first end portion 41b is disposed so as to correspond to the lower side of the opening 23a of the partition plate 23, extends obliquely downward toward the partition plate 23, and the tip thereof is inserted into the opening 23a. protrudes heat exchanger chamber S ₂ side Te. The scroll lower member 41 is formed at the first end 41b, and in a state where the scroll lower member 41 is attached to the scroll upper member 42, a part of the peripheral edge of the opening 23a of the partition plate 23 (specifically, It has a backflow prevention part 41c that comes into contact with the peripheral part 24) on the lower side of the opening 23a. Backflow prevention unit 41c, in the present embodiment, a layout tabular portion so as to abut against the surface of the heat exchanger chamber S ₂ side of the peripheral portion 24 (outer), the first end 41b and the partition plate The gap between the peripheral edge 24 of the opening 23a of the 23 is sealed. Further, at both ends of the tongue portion 41a, side wall portions 41i having a rectangular shape in a side view extending toward the scroll upper member 42 and extending toward the partition plate 23 are formed.

  Also, the scroll lower member 41 is formed with a semi-circular bell mouth lower portion 41d centering on the shaft 33b on both sides so that the scroll suction port 34a is formed when the scroll lower member 41 is mounted on the scroll upper member 42. ing. In the vicinity of the tongue 41a of the bell mouth lower portion 41d, a V-shaped concave portion 41e that protrudes toward the side and protrudes toward the scroll upper member 42 is formed. In addition, a columnar portion 41f that protrudes sideways is formed at a position substantially diagonally across the shaft 33b of the concave portion 41e of the bell mouth lower portion 41d.

  Further, the scroll lower member 41 has a claw portion 41g formed at the upper end portion on the back surface 2b side of the unit casing 2 so as to extend toward the scroll upper member 42 side, and a corner portion of the upper end portion on the back surface 2b side of the unit casing 2. The scroll upper member 42 is formed so as to extend toward the scroll upper member 42, and has a fitting portion 41 h to which a corner of the scroll upper member 42 can be fitted.

The scroll upper member 42 is formed so as to correspond to portions other than the portion corresponding to the first end 41b of the opening 23a of the partition plate 23, that is, the upper side and both sides of the opening 23a of the partition plate 23. The second end portion 42a has a reverse U-shaped cross section. The second end portion 42a, in this embodiment, like the first end 41b, extends obliquely downward toward the partition plate 23, the heat exchanger chamber S ₂ side its tip is inserted into the opening 23a And a scroll outlet 35a for blowing out the air in the scroll casing 31a together with the first end 41b. Further, the lower end portion of the second end portion 42 a is on the side of the blower chamber S ₁ so as to be along the inner surface of the side wall portion 41 i of the scroll lower member 41 and the scroll upper member 42 of the tongue portion 41 a of the scroll lower member 41. It arrange | positions so that it may contact | abut to the surface of the side. The lower end portion of the second end portion 42 a is in contact with the end portion on the side of the partition plate 23 of the side wall portion 41 i of the scroll lower member 41 between the side wall portion 41 i of the scroll lower member 41 and the partition plate 23. A claw portion 42j is formed.

  The scroll upper member 42 has a flange portion 42b formed at the second end portion 42a. The flange portion 42b is a plate-like portion extending from the outer peripheral end of the second end portion 42a along the partition plate 23 toward the upper side and both sides. The flange part 42b is a peripheral part other than the peripheral part 24 on the lower side of the opening 23a of the partition plate 23 with which the backflow prevention part 41c abuts, that is, the peripheral part 25 on the upper side of the opening 23a and the peripheral part 26 on both sides. 27, and seals the gap between the second end portion 42 a and the opening 23 a of the partition plate 23. The flange portion 42 b is fixed to the partition plate 23 by a plurality of (four in the present embodiment) screws 43 in contact with the peripheral portions 26 and 27 on both sides of the opening 23 a.

  Further, the scroll upper member 42 has clamping portions 42c and 42d that are arranged so as to sandwich the peripheral edge 24 of the opening 23a of the partition plate 23 with the backflow prevention portion 41c. In the present embodiment, the sandwiching portions 42c and 42d are plate-like portions that extend downward along the partition plate 23 from the lower end portions of the both side portions of the flange portion 42b. Thereby, the close contact between the peripheral edge portion 24 of the opening 23a of the partition plate 23 and the backflow prevention portion 41c is improved, and the first end portion 41b of the scroll lower member 41 and the portion where the opening 23a of the partition plate 23 is provided. The sealing property between is improved.

  Further, the scroll upper member 42 is formed with a semi-circular bell mouth upper portion 42e centering on the shaft 33b on both sides so that the scroll suction port 34a is formed when the scroll lower member 41 is mounted. ing. In the vicinity of the tongue portion 41a of the bell mouth upper portion 42e, a columnar portion 42f that protrudes toward the side is formed. The columnar portion 42f is disposed so as to fit into a recess 41e formed in the scroll lower member 41 in a state where the scroll lower member 41 is mounted on the scroll upper member 42. Further, an inverted V-shaped concave portion 42g that protrudes toward the side and protrudes toward the scroll lower member 41 at a position substantially diagonally across the shaft 33b of the columnar portion 42f of the bell mouth upper portion 42e. Is formed. The recess 42g is arranged so that a columnar portion 41f formed on the scroll lower member 41 fits in a state where the scroll lower member 41 is mounted on the scroll upper member 42.

  Further, the scroll upper member 42 is formed with a locking portion 42h capable of locking the claw portion 41g of the scroll lower member 41 at a position corresponding to the claw portion 41g. Further, the scroll upper member 42 has a fitting portion 42 i that is formed at the lower end portion on the back surface 2 b side of the unit casing 2 so as to extend toward the scroll lower member 41 and can be fitted onto the edge of the scroll lower member 41. Yes.

(3) Assembling method of blower The assembling method of the blower 3 of this embodiment, especially the method of incorporating the scroll casings 31a to 31c into the unit casing 2, will be described with reference to FIGS. Here, FIGS. 7 to 11 are diagrams for explaining a series of assembling operations of the blower, in particular, the scroll casings 31a to 31c.

First, work is performed so that the upper surface of the casing body 21 (not shown in FIGS. 3 and 7 to 11) in a state where the casing lid member 22 mainly constituting the lower surface of the unit casing 2 is not mounted is on the lower side. place the base in advance to form the blower chamber S ₁ and the heat exchanger chamber S ₂ by mounting the partition plate 23 to the casing body 21.

Next, as shown in FIG. 7, the second end portion 42 a of the scroll upper member 42 is inserted into the openings 23 a to 23 c of the partition plate 23, and a part thereof is projected to the heat exchanger chamber S ₂ side. Then, the scroll upper member 42 is fixed to the partition plate 23 and the casing body 21. Here, the flange portion 42 b of the scroll upper member 42 is disposed so as to contact the peripheral portions 25 to 27 of the openings 23 a to 23 c of the partition plate 23. Moreover, the clamping parts 42c and 42d are arrange | positioned so that the side part of the peripheral part 24 of opening 23a-23c of the partition plate 23 may be contact | abutted. And the part contact | abutted to the peripheral parts 26 and 27 of the flange part 42b is fixed with the screw | thread 43 (1st process).

  Next, as shown in FIG. 8, an assembly in which impellers 32a to 32c constituting the blower 3 are connected to an electric motor 33 (not shown in FIGS. 3 and 7 to 11) via a shaft 33b. The scroll upper member 42 is disposed at a predetermined position. (Second step).

Next, as shown in FIG. 9, the first end 41b of the scroll lower member 41 is inserted into the openings 23a to 23c of the partition plate 23 obliquely from above while avoiding interference with the impellers 32a to 32c. Specifically, the tongue 41a of the scroll lower member 41 is prevented from interfering with the outer peripheral surfaces of the impellers 32a to 32c. Subsequently, as shown in FIGS. 10 and 11, the scroll lower member 41 is attached to the scroll upper member 42 so as to turn the scroll lower member 41 in the direction of arrow F, and as shown in FIG. The scroll casings 31a to 31c are completed. Specifically, as shown in FIG. 10, the first end portion 41 b is separated from the partition plate so that the backflow prevention portion 41 c of the scroll lower member 41 passes below the contact claw portion 42 j of the scroll upper member 42. 23 is inserted into the openings 23a to 23c. Then, as shown in FIG. 11, protrudes backflow prevention unit 41c is a heat exchanger chamber S ₂ side of the partition plate 23, and the end portion of the partition plate 23 side of the side wall portion 41i of the scroll lower member 41 on the scroll After the first end 41b is further inserted into the openings 23a to 23c of the partition plate 23 until it abuts against the abutment claw portion 42j of the member 42, the scroll lower member 41 is further turned in the direction of arrow F to scroll. The claw portion 41 g of the lower member 41 is locked to the locking portion 42 h of the scroll upper member 42. Then, the corner portion of the scroll upper member 42 is externally fitted to the fitting portion 41 h of the scroll lower member 41, and the fitting portion 42 i of the scroll upper member 42 is externally fitted to the edge portion of the scroll lower member 41. Further, a columnar portion 42f formed in the vicinity of the tongue portion 41a of the bell mouth upper portion 42e fits into a concave portion 41e formed in the scroll lower member 41, and a columnar portion 41f formed in the scroll lower member 41 is formed in the bell mouth upper portion 42e. It fits into the recess 42g. Further, the lower end portion of the second end portion 42a of the scroll upper member 42 is disposed along the inside of the side wall portion 41i of the scroll lower member 41 (see FIG. 4). And the backflow prevention part 41c formed in the 1st end part 41b of the scroll lower member 41 contact | abuts to the peripheral part 24 of opening 23a-23c of the partition plate 23 (3rd process).

  Finally, the blower 3 is completed by attaching the casing lid member 22 to the casing body 21. Further, in the steps before and after the first to third steps, the heat exchanger 5 and the electrical component box 6 are unit casings. 2 to complete the indoor unit 1.

Thus, in the method for assembling the blower 3 of the present embodiment, the opening 23a of the partition plate 23 so that the backflow prevention portion 41c formed at the first end portion 41b does not hinder the turning operation of the scroll lower member 41. because it is formed so as to contact the surface of the heat exchanger chamber S ₂ side of the peripheral edge 24 of ～23C, without impairing workability in incorporating the scroll casing 31a~31c into the unit casing 2, the scroll under The sealing performance between the first end portion 41 b of the member 41 and the peripheral edge portion 24 of the openings 23 a to 23 c of the partition plate 23 can be improved.

(4) Operation of Indoor Unit The operation of the indoor unit 1 of the present embodiment will be described with reference to FIGS.

When rotating the impeller 32a~32c by starting the motor 33 of the blower 3, blower 3 of the blower unit inlet 2g of the unit casing 2 as inlet, the blower chamber S ₁ from either 2h Air is taken in. The blower chamber air taken in S ₁ is sucked into the scroll casing 31a to 31c via through scroll inlet 34a~34c formed on both side surfaces of the scroll casing 31a to 31c, the impeller 32a~32c Is blown out to the outer peripheral side of the impellers 32a to 32c. The air blown to the outer peripheral side of the impellers 32 a to 32 c and pressurized is scroll casings 31 a to 31 c arranged so as to correspond to the openings 23 a to 23 c of the partition plate 23 as the blower outlet of the blower 3. 31c is blown from the scroll outlet 35a~35c of the heat exchanger chamber S _2, performs heat exchange with the refrigerant flowing through the heat transfer tube of the heat exchanger 5 as it passes through the heat exchanger 5 is heated or cooled The Then, the air heated or cooled by the heat exchanger 5 is blown out into the air-conditioned room through the unit outlet 2i.

Here, since the partition plate 23 and each scroll casing 31a-31c are separate bodies, in the position of each opening 23a-23c of the partition plate 23, a clearance gap will be made between both members. Therefore, partially boosted by blowing work of the blower unit 3 from the scroll outlet 35a~35c of the scroll casing 31a~31c of air blown into the heat exchanger chamber S _2, from the pressure in the blower chamber S ₁ because of high pressure in the heat exchanger chamber S ₂ is also, there is a possibility that backflow into the blower chamber S ₁ side through the gap between the partition plate 23 and the scroll casing 31a to 31c.

However, in the scroll casings 31a to 31c of the present embodiment, when the scroll lower member 41 is mounted on the scroll upper member 42, the opening 23a of the partition plate 23 is formed at the first end 41b of the scroll lower member 41. (specifically, the periphery 24) a part of the periphery of ~23c for backflow prevention unit 41c abuts against the is provided, the workability in incorporating the scroll casing 31a~31c the blower chamber S ₁ The sealing performance between the first end portion 41b of the scroll lower member 41 and the portion provided with the openings 23a to 23c of the partition plate 23 is enhanced without loss. Thus, air blown out from the scroll outlet 35a~35c through the scroll casing 31a~31c has become less the amount of back flow to the blower chamber S _1, and it is possible to prevent a reduction in blowing performance.

Further, in the scroll casings 31a to 31c of the present embodiment, the second end 42a of the scroll upper member 42 is the opening of the partition plate 23 with which the backflow prevention portion 41c provided at the first end 41b of the scroll lower member abuts. Since the flange portion 42b is in contact with the peripheral portions 25, 26, 27 other than the peripheral portion 24 of 23a-23c, the second end portion 42a of the scroll upper member 42 and the openings 23a-23c of the partition plate 23 are provided. The sealing performance with the raised part is also improved. Thus, the amount of air blown out from the scroll outlet 35a~35c through scroll casing 31a~31c from flowing back to the blower chamber S ₁ becomes further reduced.

[Second Embodiment]
Backflow prevention unit 41c of the scroll lower member 41 of the scroll casing 31a~31c of the embodiment has been formed so as to contact the surface of the heat exchanger chamber S ₂ side of the partition plate 23, FIGS. 12 to 14 this way of the scroll casing 131a~131c embodiment, may be formed so as to contact the surface of the blower chamber S ₁ side of the partition plate 23 shown in. Here, FIG. 12 is a view showing the scroll casings 131a to 131c of the second embodiment and corresponds to FIG. FIG. 13 is a view showing the scroll casings 131a to 131c of the second embodiment and corresponds to FIG. FIG. 14 is a view showing the scroll casings 131a to 131c of the second embodiment and corresponds to FIG.

Specifically, the backflow prevention part 141c formed at the first end 141b of the scroll lower member 141 of the present embodiment extends longer than the backflow prevention part 41c of the first embodiment. In addition, a material with a thinner plate thickness or a material that is easily elastically deformed is used compared to the backflow preventing portion 41c in the first embodiment so that the elastic deformation can be easily performed. . Therefore, when incorporating the scroll casing 131a~131c the unit casing 2, as shown in Figure 15, the distal end portion of the backflow prevention unit 141c to the plane of the blower chamber S ₁ side of the peripheral edge 24 of the partition plate 23 The scroll lower member 141 is turned in the contacted state to be elastically deformed. In this way, as in the first embodiment, without impairing the workability in incorporating the scroll casing 131a~131c the blower chamber S _1, the first end portion 141b and the partition plate 23 of the scroll lower member 141 The sealing property between the peripheral edge portion 24 can be improved.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described based on drawing, a specific structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention.

(A)
In the said embodiment, although the indoor unit which has a duct structure was demonstrated as an example, it is not limited to this, Even if it applies this invention to the air blower etc. which do not have another type indoor unit and a heat exchanger Good.

(B)
In the first embodiment, the scroll casing is made of resin, but is not limited thereto, and other materials such as metal may be used.

  If the present invention is used, a scroll casing of a centrifugal blower having a structure that can be divided into a first scroll member having a tongue and a second scroll member that is mounted with the first scroll member and constitutes the scroll casing is provided as a blower casing. In the air blower configured by being incorporated into the air blower, the amount of the air blown out from the air blower outlet through the scroll casing back into the air blower casing can be reduced without impairing the workability of the assembling work. Further, in the indoor unit of the air conditioner in which the space in the unit casing is partitioned into the blower chamber and the heat exchanger chamber by a partition plate having an opening, the heat exchanger chamber is passed through the scroll casing of the centrifugal blower disposed in the blower chamber. It is possible to reduce the amount of the air blown out to the back flow into the blower chamber.

It is a top view (illustrated by removing the upper surface of the unit casing) of the indoor unit. It is a side view (A arrow line view of FIG. 1) of an indoor unit. It is a figure which shows the scroll casing of 1st Embodiment, Comprising: It is BB sectional drawing (illustrated except a unit casing) of FIG. It is a figure which shows the scroll casing of 1st Embodiment, Comprising: It is CC sectional drawing of FIG. It is a figure which shows the scroll casing of 1st Embodiment, Comprising: It is a D arrow line view of FIG. It is a figure which shows the scroll casing of 1st Embodiment, Comprising: It is EE sectional drawing of FIG. It is a figure explaining a series of assembly work of the air blower of 1st Embodiment, especially a scroll casing. It is a figure explaining a series of assembly work of the air blower of 1st Embodiment, especially a scroll casing. It is a figure explaining a series of assembly work of the air blower of 1st Embodiment, especially a scroll casing. It is a figure explaining a series of assembly work of the air blower of 1st Embodiment, especially a scroll casing. It is a figure explaining a series of assembly work of the air blower of 1st Embodiment, especially a scroll casing. It is a figure which shows the scroll casing of 2nd Embodiment, Comprising: It is a figure corresponded in FIG. It is a figure which shows the scroll casing of 2nd Embodiment, Comprising: It is a figure corresponded in FIG. It is a figure which shows the scroll casing of 2nd Embodiment, Comprising: It is a figure corresponded in FIG. It is a figure explaining a series of assembling work of the air blower of 2nd Embodiment, especially a scroll casing, Comprising: It is a figure equivalent to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Unit casing 2g, 2h Unit inlet 2i Unit outlet 3 Blower 5 Heat exchanger 23 Partition plate 24 Peripheral part 23a-23c Opening 31a-31c, 131a-131c Scroll casing 32a-32c Impeller 33 Electric motor 33b Shaft 35a-35c Scroll outlet 41, 141 Scroll lower member 41a Tongue portion 41b, 141b First end portion 41c, 141c Backflow prevention portion 42 Scroll upper member 42a Second end portion 42b Flange portion 42c, 42d Holding portion S ₁ Blower chamber S ₂ heat exchanger room

Claims (4)

It is a scroll casing of a centrifugal blower that is arranged in a blower casing (S ₁ ) having a blower inlet (2g, 2h) and blower outlets (23a to 23c) and constitutes a blower (3). ,
Tongue and (41a), a first scroll member having a first end that is formed so as to correspond to a portion of the blower outlet to the blower outlet side of the tongue (41 b) (4 1 ) and
Scroll outlets (35a to 35c) formed so as to correspond to portions other than the portion corresponding to the first end of the blower outlet, and for blowing out air in the scroll casing together with the first end. A second scroll member (42) having a second end (42a) to be configured and having the first scroll member mounted thereon to constitute a scroll casing;
Said first scroll member, said formed in the first end portion, the backflow prevention unit abutting the portion (24) of the peripheral portion of the blower outlet in the mounted state to the second scroll member (41 c ) has a,
The backflow prevention part is arranged so as to contact the outer surface of the blower casing,
The second scroll member has a sandwiching portion provided so as to sandwich a part of a peripheral edge of the blower outlet from the backflow prevention portion.
Scroll casing of the centrifugal blower (31a~31 c). The second scroll member (42) has a flange portion (42b) formed at the second end portion (42a),
The flange portion, the peripheral portion of the backflow prevention unit (41 c) is the periphery of the portion (24) other than the blower outlet of the blower outlet abutting (23a to 23c) (25, 26, 27 )
Scroll casing of the centrifugal fan according to claim 1 (31a~31 c). A centrifugal blower which is arranged in a blower casing (S ₁ ) having a blower inlet (2g, 2h) and a blower outlet (23a-23c) and constitutes a blower (3),
A scroll casing (31a~31 c) according to claim 1 or 2,
An impeller (32a-32c) disposed in the scroll casing;
An electric motor (33) for rotationally driving the impeller;
Centrifugal blower with A substantially box-shaped unit casing (2) having a unit inlet (2g, 2h) and a unit outlet (2i);
A partition provided in the unit casing and dividing a space in the unit casing into a blower chamber (S ₁ ) communicating with the unit inlet and a heat exchanger chamber (S ₂ ) communicating with the unit outlet. A plate (23);
Wherein a tongue and (41a), a first end portion which is formed so as to correspond to a portion of the opening (23a to 23c) of the partition plate to the partition plate side of the tongue and a (41 b) A first scroll member (4 1 ) provided in the blower chamber;
Scroll outlets (35a to 35c) formed so as to correspond to portions other than the portion corresponding to the first end portion of the opening of the partition plate and for blowing air into the heat exchanger chamber together with the first end portion. A second scroll member (42) provided in the blower chamber having a second end (42a) constituting the first casing and having the first scroll member mounted thereon to constitute a scroll casing (31a-31c);
An impeller (32a-32c) disposed in the scroll casing;
An electric motor (33) for rotationally driving the impeller;
A heat exchanger (5) disposed in the heat exchanger chamber for exchanging heat of the air taken into the unit casing;
The first scroll member is formed at the first end portion, and in a state where the first scroll member is attached to the second scroll member, a backflow prevention portion (41c) that contacts a part (24) of a peripheral edge portion of the opening of the partition plate. a has,
The backflow prevention part is disposed so as to contact the surface of the partition plate on the heat exchanger chamber side,
The second scroll member has a sandwiching portion provided so as to sandwich a part of the peripheral edge portion of the opening of the partition plate between the backflow prevention portion,
Indoor unit (1) of an air conditioner.

Images