JP2006151034A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner (for example, an air blower) capable of easily decreasing the clearance between a scroll casing and a motor housing, and inexpensively manufacturing without deteriorating mounting property of the motor housing to the scroll casing. <P>SOLUTION: The air blower 70 is composed of the scroll casing 20 which is equipped with a plurality of projection 27 which is separately provided on the inner peripheral edge of the circular shaped mounting hole 26 in the circumferential direction and the radial direction dimension increases as advancing to the circumferential direction, a fan 40 rotatably disposed in the scroll casing, and the motor housing 50 where a plurality of engaging parts 56 which can be engaged with a plurality of notches and projections which hold the motor 45 connected to the fan and allow the projection to pass to the outer peripheral surface, is alternately formed in the circumferential direction. After the motor housing is inserted into the mounting hole of the scroll casing, the motor housing is turned and the motor housing is mounted to the scroll casing by engaging the projections with the engaging parts. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air conditioner, and more particularly to a blower constituting a blower that takes outside air and inside air and sends them to a heat exchanger.

  In an air conditioner such as a vehicle, outside air and inside air are taken in by a blower including an inside / outside switching box and a blower and sent to a heat exchanger. Among them, the blower includes a scroll casing, a fan, a motor, and a motor housing. A fan is disposed in the scroll casing, a motor for rotating the fan is held by the motor housing, and the motor housing is coupled to the scroll casing. The scroll casing and the motor housing are coupled in various ways.

  In a conventional blower (see Patent Document 1), a motor housing is attached to a scroll casing by utilizing relative rotation. For this purpose, a circular opening having an inner diameter larger than the outer diameter of the fan is formed in the bottom wall portion of the scroll casing, and a spiral inner protrusion that elastically deforms is formed on the inner periphery thereof. On the other hand, an outer protrusion that can be elastically deformed and engaged with the inner protrusion is formed in the annular portion of the motor housing. The inner protrusion and the outer protrusion constitute a fitting portion.

When the motor housing is attached to the scroll casing, the motor housing is rotated by a predetermined angle with respect to the scroll casing to elastically engage the inner protrusion and the outer protrusion. Both stop positions are determined by an engaging means that is disposed between the inner protrusion and the outer protrusion and engages at a predetermined position. Thus, the motor housing is restrained in the vertical direction and the rotational direction with respect to the scroll casing.
Japanese Patent No. 3489221

  The conventional example has room for improvement in terms of cost. That is, there may be errors such as a manufacturing error of the fitting portion composed of the inner protrusion and the outer protrusion and an assembly error of the scroll casing and the motor housing, and for this reason, when vibration is applied to the vehicle body, the motor is applied to the scroll casing. The housing may rattle in the vertical direction and / or the radial direction, and abnormal noise may occur.

  In order to eliminate this error, it is necessary to tune the molding die for molding the scroll casing and / or the motor housing, leading to an increase in cost. In addition, when too much is packed, it becomes difficult to assemble the scroll casing and the motor housing.

  The present invention has been made in view of the above circumstances, and can easily pack backlash between the two cases without deteriorating the attachment of the second case (for example, the motor housing) to the first case (for example, the scroll casing). An object of the present invention is to provide an air conditioner (for example, a blower) that can reduce the cost.

  The inventor of the present application inserts the first case (for example, the scroll casing of the blower) and the second case (for example, the motor housing of the blower) in the axial direction and then relatively rotates them to engage one of the convex portions with the other. The present invention was completed with the idea of engaging the part.

  (1) The air conditioner according to the first aspect of the present invention, as described in claim 1, includes a first case and a second case that are attached to each other by a circular fitting portion by relative rotation after being inserted in the axial direction. A plurality of convex portions formed along the fitting portion in either one of the first case and the second case and increasing in size in the rotation direction, and either the first case or the second case A plurality of recesses formed along the fitting portion and allowing passage of the plurality of projections when inserted in the axial direction between the first case and the second case, and a plurality of recesses on either one of the first case and the second case And a plurality of engaging portions that are alternately formed and engage with the plurality of convex portions at the time of relative rotation between the first case and the second case.

  (2) The blower according to the second aspect of the present invention, as described in claim 5, is circumferentially spaced at the inner peripheral edge of the circular mounting hole, and has a radial dimension or thickness (axis) as it advances in the circumferential direction. (Direction) A scroll casing having a plurality of protrusions that increase in direction, a fan rotatably disposed in the scroll casing, and a motor coupled to the fan are held, and the passage of the first protrusion is allowed on the outer peripheral surface thereof. And a motor housing in which engaging portions engageable with a plurality of notches and protrusions are alternately formed in the circumferential direction. After the motor housing is inserted into the mounting hole of the scroll casing, the motor housing is rotated to engage the protrusion and the engaging portion, and the motor housing is attached to the scroll casing.

  (1) According to the air conditioner according to the first aspect of the present invention, due to the relative rotation of the first case and the second case, any one of the plurality of convex portions and the other plurality of engaging portions are engaged, Shaking between the two cases is prevented. Further, since the other concave portion allows passage of the one convex portion in the axial direction, insertion in the axial direction becomes easy.

  According to the air conditioner of the second aspect, since the radial dimension of the plurality of convex portions is increased, the radial backlash between the first case and the second case is caused by the engagement with the engaging portion. Can prevent sticking. According to the air conditioner of the third aspect, since the axial dimension of the plurality of convex portions is increased, the axial backlash between the first case and the second case due to the engagement with the engaging portion. Can prevent sticking. According to the air conditioner of the fourth aspect, when one of the first case and the second case has an attachment hole and the other has a columnar shape or a cylindrical shape, both cases can be reliably coupled by insertion and rotation.

  (2) According to the blower according to the second aspect of the invention, firstly, both are assembled to each other only by inserting and rotating the motor housing with respect to the scroll casing, and the assemblability is improved. During insertion, the notch in the motor housing allows the projection of the scroll casing to pass in the axial direction. Second, rattling between the scroll casing and the motor housing is easily and reliably prevented by the engagement of the inner surfaces of the plurality of protrusions and the outer surfaces of the plurality of engaging portions. Third, even if there is a manufacturing error in the scroll casing and / or the motor housing, this manufacturing error is absorbed and offset between the protrusion and the engaging portion when both are assembled. This is unnecessary and the cost can be reduced.

  According to the blower of the sixth aspect, since the projection is formed by the inward protruding piece and the engaging portion is formed by the outward recessed portion, the inward protruding piece is engaged with the bottom of the outward recessed portion by the rotation, and the radial direction Prevent rattling. In addition, it is easy to form the inner surface of the inwardly projecting piece and the bottom surface of the outwardly recessed portion. According to the blower of claim 7, since one of the inner surface of the inward projecting piece and the bottom surface of the outward recess extends in the tangential direction and the other forms a small predetermined angle with respect to this, both engage with each other by the wedge action. In addition, it is possible to reliably prevent radial rattling. According to the blower of the eighth aspect, the rattling in the axial direction between the motor housing and the scroll casing can be prevented by the engagement between the lower surface of the downward projecting piece of the projection and the bottom surface of the upward concave portion of the engaging portion. .

  A. The air conditioner of the present invention includes a first case and a second case that are attached to each other by a circular fitting portion by relative rotation after being inserted in the axial direction. Either one of the first case and the second case is formed with a plurality of protrusions along the fitting portion, and at least some of the protrusions are radially dimensioned and / or axially as the rotation proceeds. The dimensions are increasing.

  A plurality of recesses are formed on either one along the fitting portion, and each recess allows passage of the plurality of projections when the first case and the second case are inserted in the axial direction. In addition, a plurality of engaging portions are formed alternately on the other side with a plurality of recessed portions, and at least a part of the engaging portions is formed on each protruding portion during relative rotation between the first case and the second case. Engage. The plurality of convex portions whose radial dimension gradually increases are engaged with the plurality of engaging portions to prevent the rattling in the radial direction between the first case and the second case. In addition, the plurality of convex portions whose axial dimensions gradually increase are engaged with the plurality of engaging portions to prevent the rattling in the axial direction between the first case and the second case. You may prevent shakiness of both an axial direction and a radial direction with a convex part and an engaging part.

  One of the first case and the second case may have a circular mounting hole, and the other may have a cylindrical shape or a circumferential shape. In both cases, the other case is combined so that the other is inserted in one mounting hole in the axial direction, and then the first case and the second case are relatively rotated to engage the convex portion and the engaging portion. Combined together.

B. Blower The blower of the present invention includes a scroll casing that divides an air passage, a fan disposed in the scroll casing, a motor housing that holds a motor that rotationally drives the fan, and a protrusion and an engaging portion that attach the motor housing to the scroll casing. And consist of

(1) Scroll casing, motor housing The scroll casing defines an air passage for air sent out from the fan, and includes an upper wall portion having a suction port, a bottom wall portion having a motor mounting hole, and the like. The fan that forms the air flow includes a central boss and a large number of blades on the outer periphery. For example, a rotating shaft of a motor arranged so that its axis is in a vertical direction is coupled to a fan boss, and the motor drives the fan to rotate. The motor housing that holds the motor has a cylindrical holding portion.

(2) Protrusions and engaging portions At least some of the plurality of protrusions on the inner peripheral edge of the mounting hole of the scroll casing and engagement of at least some of the plurality of engaging portions on the outer peripheral surface of the motor housing The motor housing is attached to the scroll casing by engagement with the part. The motor housing is formed with a plurality of notches that allow the projections of the scroll casing to pass therethrough alternately with the engaging portions in the circumferential direction.

(A) Radial rattling The plurality of protrusions of the scroll casing include radially inwardly protruding pieces. The plurality of engaging portions of the motor housing are U-shaped in cross section and open outward in the radial direction and include outward concave portions that can receive the inward protruding pieces. If one of the inner surface of the inward projecting piece and the outer surface (bottom surface) of the outward recess is formed in a tangential direction and the other is formed at a small angle with respect to the tangential direction, the motor housing is mounted on the scroll casing. When rotating, rattling in the radial direction can be prevented by the engagement of the two.

(B) Shaking in the axial direction Instead of, or in addition to, preventing the rattling in the radial direction, the scroll casing is formed by engaging the lower surface or upper surface of each protrusion with the upper surface or lower surface of each engaging portion. The backlash of the motor housing in the axial direction (vertical direction) can be prevented. Specifically, the first protrusion has a downward protruding piece protruding downward in the axial direction or an upward protruding piece protruding upward, and the engaging part has an upward recessed part or a downward recessed part that opens upward or downward in the axial direction. Can do.

  The upward projecting piece or the downward projecting piece can be located outside the inward projecting piece in the radial direction and can be located above or below in the axial direction. Moreover, an upward recessed part or a downward recessed part can be located outside the said outward recessed part in radial direction, and can be located upward or downward in an axial direction.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Example>
(Constitution)
The blower shown in FIG. 1 is roughly divided into an inside / outside air switching box 10 and a blower 70 located below the box. The inside / outside air switching box 10 includes an outside air introduction port 12 for introducing outdoor air into the upper portion and an inside air introduction port 14 for introducing room air into the side surface, and the opening degree is adjusted by a rotatable inside / outside air switching door 16. .

  As shown in FIGS. 1 and 2, the blower 70 includes a scroll casing (hereinafter referred to as “casing” as appropriate) 20, a fan 40 accommodated in the casing 20, a motor 45 that rotates the fan 40, and a motor 45 includes a motor housing (hereinafter referred to as “housing” as appropriate) 50 attached to the casing.

  The casing 20 includes an upper wall part 22, a bottom wall part 25, and a side wall part (peripheral wall part) 33. An air inlet 23 is formed at the center of the upper wall portion 22, and an attachment hole 26 is formed in the bottom wall portion 25. An air outlet 36 is formed at the tip of the scroll-shaped side wall 35.

  As can be seen from FIGS. 2, 3, 4, and 5, a plurality of downward projecting pieces 28 extending downward are circumferentially provided on the inner peripheral edge of the circular mounting hole 26. An inward protrusion 27 extends radially inward from the middle of each downward protrusion 28, and includes a plurality of inward protrusions 29 protruding radially inward.

  As shown in FIGS. 1 and 2, the fan 40 disposed in the casing 20 includes a central boss 41, a plurality of outer peripheral blades 42, a bottom plate 43 that couples both, and the like. The boss 41 is coupled to the upper end of the rotating shaft 46 of the motor 45, and a large number of blades 42 spaced in the circumferential direction form a predetermined angle with respect to the normal direction. The bottom plate 43 has a mountain shape with a high center and a low periphery (a shape in which the teacup is turned down), and connects the boss 41 and the lower end of the blade 42. The upper end of the blade 42 is coupled by an annular coupling portion 44.

  A motor 45 that rotationally drives the fan 40 has a rotor 47 and a stator 48, is arranged so that its axis is vertical, and is attached to the casing 21 by a motor housing 50. The housing 50 includes a cylindrical holding portion 51 that holds the motor 45 and a flange portion 54 that extends radially outward from an axially intermediate portion of the outer peripheral surface thereof. A boss 41 of the fan 40 is coupled to a rotating shaft 46 extending upward from the rotor 47.

  The flange portion 54 closes the attachment hole 26 and attaches the fan 40 and the motor 45 to the casing 21 at predetermined positions. The outer diameter is smaller than the inner diameter of the mounting hole 26 of the scroll casing 20. As shown in FIGS. 4 and 5, the plurality of outward projections 56 spaced in the circumferential direction on the outer peripheral edge of the flange portion 54 are provided with a pair of upper and lower protrusions 57 b and open outward in a U-shaped cross section. The outward concave portion 57a. An upward concave portion 58 having a U-shaped cross section and opening upward is formed on the radially outer side of each outward projection 56.

  As shown in FIGS. 4, 5, and 6, among the plurality of inward protrusions 27, the arc surface of the inward protrusion piece 29 of the three inward protrusions 27 located at a position where the circumferential length is equally divided into three A rib 60 is integrally formed on the inner surface 29a. The rib 60 has a triangular cross section, and the thickness on one side 61a (upper side in FIG. 4) in the circumferential direction is thicker and the thickness on the other side 61b is thinner. The bottom surface (outer surface) 57 c of the outward recess 57 a is close to or in contact with the inner surface 29. Ribs are not formed except for the three inwardly projecting pieces 29.

  The depth of the recess 59 between the adjacent outward recesses 57 is deeper than the depth of the bottom surface 57 c of the outward recess 57. The flat lower surface of the downward projecting piece 28 is close to or in contact with the flat bottom surface (upper surface) of the upward recess 58. The plurality of inward projections 27 of the scroll casing 20 and the plurality of outward projections 56 of the motor housing 50 constitute a circular fitting portion 65.

(Function)
1 and 2, the motor 45 is held by the holding portion 51 of the motor housing 50, and the boss 41 of the fan 45 is coupled to the tip of the output shaft 46 of the motor 45. Thus, after integrating the motor 45, the motor housing 50 and the fan 40, the motor housing 50 is attached to the scroll housing 20 through the attachment hole 26.

  At this time, as shown in FIG. 6, the pair of protrusions 57b of the outward recess 57 of the motor housing 50 and the inward protrusions 29 of the scroll housing 20 are shifted in the circumferential direction, that is, inward protrusions. In a state where 27 is opposed to the recess 59 between the adjacent outward projections 56, both are brought close to each other in the axial direction (x direction in FIG. 2).

  After the motor housing 50 is inserted into the scroll casing 20 to a predetermined position in the axial direction, the motor housing 50 is rotated around the axis (y direction in FIG. 2). Then, as shown in FIGS. 4 and 5, the inward projecting piece 29 enters the outward recess 57a, and the rib 60 is crushed by the bottom surface 57c of the outward recess 57a. The motor housing 50 is attached to the scroll casing 20 by the engagement between the inner surface 29a of the inwardly projecting piece 29, that is, the rib 60, and the bottom surface 57c of the outwardly recessed portion 50a.

  After the motor housing 50 is mounted, the inside / outside air switching door 16 of the inside / outside air switching box 10 is rotated to open and close the outside air introduction port 12 and the inside air introduction port 14 in a predetermined state. When the fan 40 is rotated by the motor 45, the outside air and the inside air are sucked in the axial direction through the air inlet 23 of the scroll housing 20 by the blade 42, reflected by the bottom plate 43 of the fan 40, and the flow direction changes radially outward. Air is discharged from the discharge port 36 of the scroll housing 20 and sent to the heat exchanger on the downstream side.

(effect)
According to this embodiment, when the inward projection piece 29 of the inward projection 27 of the scroll casing 20 and the outward recess 57c of the outward projection 56 of the motor housing 50 are engaged by turning, Shaking can be prevented. This is because the ribs 60 are interposed between the inner surfaces 29a of the plurality of inward projecting pieces 29 and the bottom surfaces 57c of the plurality of outward openings 57a. Since the inward projection 27 and the outward projection 56 are simple in shape, they are easy to form and the cost does not increase.

  The addition of the rib 60 eliminates the need for tuning to close the backlash between the outward protrusion 56 and the inward protrusion 27, thereby suppressing an increase in cost. Further, since the rib 60 is crushed after being attached, it does not hinder the attachment of the motor housing 50 to the scroll casing 20.

<Modification>
In the modification shown in FIG. 7, shakiness in the axial direction (vertical direction) is absorbed by the plurality of downward projections 70 and the plurality of upward projections 80. A rib 90 is interposed between the lower surface 72a of the downward projection piece 72 of the downward projection 70 and the bottom surface 82a of the upward recess 82 of the upward projection 80 in a direction perpendicular to the paper surface of FIG. The rib 90 has a triangular cross section, and the thickness on one side in the circumferential direction is thick and the thickness on the other side is thin. Each downward projection 70 has an inward projection piece 74, and each upward projection 80 has an outward recess portion 84 that receives the inward projection piece 74.

  According to this modification, the motor housing 50 is rotated after being inserted into the scroll casing 20, and the outward recess 84 and the inward protrusion 74 are engaged. At that time, the ribs 90 between the respective downward projecting pieces 72 and the respective upward recessed portions 82 are compressed to prevent the occurrence of rattling and abnormal noise in the axial direction (vertical direction in FIG. 7).

It is sectional drawing which shows the blower containing the Example (blower) of this invention. It is a perspective view of the said Example. It is a bottom view of the motor housing of the said Example. It is a principal part enlarged view of FIG. FIG. 3 is a cross-sectional view taken along a line 3-3 in FIG. 4. It is explanatory drawing explaining the action | operation of an Example. It is principal part sectional drawing which shows a modification.

Explanation of symbols

10: Inside / outside air switching box 20: Scroll casing 25: Bottom wall part 26: Mounting hole 27: Projection 40: Fan 45: Motor 50: Motor housing 54: Flange part 56: Engagement part 60: Rib 70: Blower

Claims (8)

A first case (20) and a second case (50) attached to each other by a circular fitting portion (65) by relative rotation after insertion in the axial direction;
A plurality of convex portions (27) formed along the fitting portion in any one of the first case and the second case, and increasing in size in the rotation direction;
Formed along one of the first case and the second case along the fitting portion, and allows the plurality of convex portions to pass when the first case and the second case are inserted in the axial direction. A plurality of recesses (59);
A plurality of the first case and the second case, which are alternately formed with the plurality of recesses, and engage with the plurality of projections when the first case and the second case rotate relative to each other. Engaging portions (56) of
An air conditioner comprising:   The plurality of convex portions and the plurality of engaging portions having gradually increasing radial dimensions prevent radial rattling between the first case and the second case. Air conditioner.   The plurality of convex portions and the plurality of engaging portions whose axial dimensions are gradually increased prevent the rattling in the axial direction between the first case and the second case. Air conditioner.   The air conditioner according to claim 3, wherein one of the first case and the second case has a circular mounting hole, and the other has a cylindrical shape or a circumferential shape. A scroll casing (20) provided with a plurality of protrusions (27) spaced circumferentially at the inner peripheral edge of the circular mounting hole (26) and increasing in radial dimension or axial direction as it advances in the circumferential direction; ,
A fan (40) rotatably disposed in the scroll casing;
A plurality of notches (59) that hold the motor (45) coupled to the fan and allow the protrusion to pass through on the outer peripheral surface thereof, and an engagement portion (57a) that can be engaged with the protrusion have a circumferential shape. Motor housings (50) alternately formed in directions,
An air blower characterized in that after the motor housing is inserted into an attachment hole of the scroll casing, the motor housing is rotated to engage the protrusion and the engagement portion, and the motor housing is attached to the scroll casing. .   Each of the protrusions is composed of an inward protruding piece (29), and each of the engaging portions is formed of a bottom portion (57c) of an outwardly recessed portion (57) capable of receiving the inwardly protruding piece with a U-shaped cross section. The blower according to claim 5, wherein rattling in a radial direction is prevented between the piece and a bottom portion of the outward concave portion.   The blower according to claim 6, wherein a bottom surface of the outward recess extends in a tangential direction, and an inner surface of the inward projecting piece forms a predetermined angle with respect to the bottom surface.   Each projection is composed of a downward projecting piece (72), and each engaging portion is composed of a bottom portion of an upward recess (82a) having a U-shaped cross section and capable of receiving the downward projecting piece, and the bottom surface of the downward projecting piece and the upward recess. The blower according to claim 6, wherein shakiness in the axial direction is prevented.

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