JP2006177289A - Blower unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cool a motor without preventing smooth movement of a scroll casing. <P>SOLUTION: A double shaft blower motor 2 for driving a centrifugal fan 11 is fixed and stored in a motor case 5 fixed and arranged to/in a main body case 4. The centrifugal fan is stored in the scroll casing 14 turnable around a rotary shaft to blow out air from a blowing-out port 18 capable of changing a blowing-out position. A cooling air taking-in port 8 and a cooling air coming-out hole 10 are provided in a flange part 6 on one side of the motor case and a lid part 9 on the other side, respectively. A bottom coming-out hole 13 is provided in a bottom part 12 of the centrifugal fan. Outside air sucked into a motor chamber 7 from a bypass passage 19 and the cooling air taking-in port together with main flow of blowing air from an intake port 15 without depending on turn of the scroll casing forms a cooling air flow cooling the motor, passing through the cooling air coming-out hole and the bottom coming-out hole, and sucked into the inside 11a of a fan to join the flow of blowing air. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a blower unit.

Conventionally, in a vehicle air conditioner, a centrifugal fan is disposed in a scroll casing, and a blower unit that drives the centrifugal fan with a motor disposed on the bottom side of the centrifugal fan is generally used. In such a blower unit, the motor is cooled by guiding a part of the blown air to the inside of the motor via the passage of the motor cooling air (for example, refer to Patent Document 1).
JP-A-5-133393

  In the prior art described above, by forming a duct for taking in motor cooling air from the discharge side passage of the centrifugal fan in the scroll casing to the motor case, the high pressure air on the discharge side is forcibly sent into the motor case.

  However, in such a conventional technique, when the direction of the air outlet is changed by rotating the scroll casing around the rotation axis of the centrifugal fan, the motor cooling air duct interferes with the movement of the scroll casing. There is a problem that smooth rotation is impossible.

  In view of the above points, an object of the present invention is to cool a motor without preventing smooth movement of the scroll casing.

  In order to achieve the above object, according to the first aspect of the present invention, a scroll casing (14) that forms a ventilation passage (17a) for air that is sucked from the intake port (15) and blown, and disposed inside the scroll casing. A centrifugal fan (11) that blows air into the air passage, a motor (2) that drives the centrifugal fan, and a motor case (5) that houses the motor, and the motor case communicates with the outside air of the scroll casing. A cooling air intake (8) is provided, and an outer peripheral portion (20a) around the motor rotation shaft (3) of the motor case is fitted into the scroll casing, so that the motor case inner space (7) and the scroll casing inner space communicate with each other. A bottom hole (13) is formed in the bottom (12) of the centrifugal fan, and the motor case inner space (7) is distant from the bottom hole. Internal fans and (11a) are allowed to communicate with each other, characterized in that.

  According to the present invention, the motor case, the scroll casing, and the inside of the centrifugal fan can communicate with each other. Therefore, when air is blown by the centrifugal fan, the outside of the motor case is connected via the cooling air intake port. A cooling air passage is formed so that the air flowing into the motor case is further sucked into the centrifugal fan on the low pressure side from the bottom holes of the scroll casing and the centrifugal fan. Therefore, in the centrifugal fan, the cooling air flowing while cooling the motor in the motor case inner space can be blown to the scroll casing together with the air from the intake port which is the main air flow. As a result, it is not necessary to form a motor cooling air passage by providing a duct from the discharge side of the scroll casing to the motor case as in the prior art, so the scroll casing is rotated with respect to the motor case to change the blowing direction. Even when trying to do so, smooth movement of the scroll casing is not prevented.

  And as described in Claim 2, the outer peripheral part (20a) around the motor rotating shaft (3) of a motor case can be fitted to a scroll casing.

  Furthermore, as described in claim 3, the lid portion (9) between the motor rotating shaft and the outer peripheral portion of the partition walls constituting the motor case faces the inner space of the scroll casing, A hole (10) can be provided that allows the motor case inner space and the scroll casing inner space to communicate with each other. Thus, the shape retention strength at the time of rotation is given to the motor case by the lid portion, and the motor case inner space and the scroll casing inner space can be brought into communication with each other through the hole of the lid portion.

  In addition, as described in claim 4, the casing rotating mechanism (22) rotates the scroll casing around the motor rotation axis with respect to the motor case, that is, along the fitting portion with the outer peripheral portion of the motor case. Can be made.

  According to a fifth aspect of the present invention, there is provided a main body case (4) which is fixed to the motor case and accommodates the motor case and the scroll casing, and one of the main body case and the scroll casing is open to the inlet side. However, by forming the bypass passage (19) provided with the cooling air intake on the other side, the air flowing into the motor case from the cooling air intake can be taken in from the intake port of the centrifugal fan.

  Furthermore, as described in claim 6, by providing a filter (16) for filtering the intake air at the intake port, the outside air flowing into the bypass passage and the centrifugal fan is filtered and purified by the filter. The purified air can be used as motor cooling air, and can be blown by being added to the conditioned air by a centrifugal fan.

  According to the seventh aspect of the present invention, the first and second scroll casings (14) forming the air passages (17a) for the air sucked and blown from the air inlet (15), respectively, and the first and second scroll casings (14), respectively. The first and second centrifugal fans (11) that are arranged inside the scroll casing and blow the air into the air passage, and the double-shaft motors (2) that drive the first and second centrifugal fans on both ends of the rotating shaft, respectively. ), A motor case (5) that houses the dual-axis motor, and a casing rotation mechanism (22) that rotates the scroll casing around the motor rotation shaft (3) with respect to the motor case. A cooling air intake port (8) communicating with air is provided, and first and second outer peripheral portions (20a) around the motor rotation shaft (3) of the motor case are first and second, respectively. 2, the motor case inner space (7) and the first and second scroll casing inner spaces are in communication with each other, and each bottom (12) of the first and second centrifugal fans is connected. Is formed with a bottom hole (13), and the space inside the motor case and the inside (11a) of the first and second centrifugal fans can communicate with each other through each bottom hole. To do.

  That is, the motor housed in the motor case is a double-shaft type, the first and second centrifugal fans are provided at both ends of the rotating shaft, and the first and second scroll casings are arranged for each centrifugal fan. By doing this, these scroll casings can be rotated along the fitting part with the outer peripheral part around the motor rotation axis of the motor case. At this time, the cooling air that has flowed into the motor case from the cooling air intake port is sucked into the first and second scroll casings that can communicate with each other after the motor is cooled. Air is blown by the first and second centrifugal fans, respectively.

  Therefore, when two centrifugal fans are driven by one double-axis motor and the conditioned air and the motor cooling air are simultaneously blown from the respective scroll casings, even when the scroll casing is rotated to change the blowing direction, The movement can be performed smoothly without blocking.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the blower unit 1 according to the present invention is applied to a vehicle air conditioner for a rear seat, and FIG. 1 is a cross-sectional view taken along line AA of the blower unit 1 of the vehicle air conditioner of this embodiment. 2 is a cross-sectional view taken along the line BB in FIG. 1, and FIG.

  The blower unit 1 of this embodiment is installed in a trunk room (not shown) provided on the rear side of the rear seat, as shown by the arrows in FIGS. The inclined portion is arranged along the seat back (not shown) of the rear seat. In FIG. 2, the evaporator 23 and the heater core 24 are omitted.

  The blower unit 1 includes a double-axis blower motor 2 at the center. The double-axis blower motor 2 is fixedly disposed on the motor case 5 so that the longitudinal direction of the shaft 3 as a rotating shaft is the left-right direction. The left and right portions of the shaft 3 are in a line-symmetric relationship, and one can be referred to as “first” and the other as “second”. However, in the following description, the same reference numerals are given to the left and right identical components, and “first” and “second” are omitted.

  The motor case 5 forms a substantially cylindrical motor chamber 7 so as to accommodate the double-axis blower motor 2 and is integrally fixed to the main body case 4 via the flange portion 6. The main body case 4 and the motor case 5 are each divided into two symmetrical parts at the center in the left-right width direction, and when assembled, they are integrated together by a fastening means (not shown) such as an appropriate clamp. Connected. The main body case 4, the motor case 5, the rotary scroll casing 14 described later, and the like are formed of resin.

  The flange portion 6 of the motor case 5 is provided with a cooling air intake 8 that communicates a bypass passage 19 formed by the main body case 4 and a rotary scroll casing 14 described later and a motor chamber 7 that is an inner space of the motor case 5. It has been.

  The shaft 3 of the double-axis blower motor 2 projects out of the motor case 5 from a lid portion 9 that forms a plane perpendicular to the shaft 3 that is the motor rotation shaft among the partition walls constituting the motor case 5. The bottom 12 of the fan 11 is fastened.

  A plurality of cooling air vent holes 10 are provided in the lid portion 9 so that the motor chamber 7 in the motor case 5 and the centrifugal fan 11 side can communicate with each other. Further, the bottom portion 12 of the centrifugal fan 11 is provided with a plurality of bottom holes 13 around the shaft 3. Therefore, when the centrifugal fan 11 is rotationally driven by the double-shaft blower motor 2, the pressure inside the centrifugal fan 11 decreases, so that the motor chamber 7 corresponding to atmospheric pressure passes through the cooling air vent hole 10 and the bottom hole 13. An air flow is generated inside the centrifugal fan 11.

  The centrifugal fan 11 is accommodated in the rotary scroll casing 14. On the opposite side of the rotary scroll casing 14 from the bottom 12 of the centrifugal fan 11, an air inlet 15 is opened. The outside air purified by the filter 16 disposed outside the intake port 15 is sucked from the intake port 15 and blown by the centrifugal fan 11, and is surrounded by the outer peripheral wall 17 of the rotary scroll casing 14. It is collected at 17a and blown out from the air outlet 18.

  The inner peripheral fitting portion 20 b of the rotary scroll casing 14 is circular and is arranged so that the center coincides with the rotation axis of the shaft 3. On the other hand, a lid portion 9 is formed between the outer peripheral portion of the motor case 5 and the motor rotating shaft 3. And the inner periphery fitting part 20b of this rotary scroll casing 14 is slidably fitted with the outer periphery fitting part 20a which is the circular outer peripheral part of the cover part 9 of the motor case 5 arranged concentrically.

  Thus, the lid 9 faces the internal space of the rotary scroll casing 14 and is the only partition that separates the internal space of the motor case 5 and the internal space of the rotary scroll casing 14. Therefore, by providing the cooling air vent hole 10 in the lid portion 9, the space in the motor case 5 and the space in the rotary scroll casing 14 can be brought into communication. In addition, since the strength of the circular shape of the outer peripheral fitting portion 20a can be maintained by the lid portion 9, there is an effect that the shape change of the motor case 5 does not occur with respect to the rotation of the rotary scroll casing 14.

  Further, a guide member 21a formed on the flange portion 6 of the motor case 5 and a guide member 21b provided on the rotary scroll casing 14 side are slidably fitted. Further, a bypass passage 19 that is opened in an annular shape is formed between the outer peripheral wall 17 of the rotary scroll casing 14 and the main body case 4.

  That is, one end of the bypass passage 19 is open to the intake port 15 side of the main body case 4, and the other end is connected to the flange portion 6 of the motor case 5. Therefore, the pressure (atmospheric pressure) of the outside air of the main body case 4 is applied to the motor chamber 7 in the motor case 5 via the cooling air intake 8 provided in the flange portion 6 and the bypass passage 19.

  The rotary scroll casing 14 is rotated around the outer periphery fitting portion 20 a of the motor case 5 by a casing rotary motor 22 as a casing rotation mechanism disposed on the outer peripheral portion of the rotary scroll casing 14. At this time, the max hot that blows only to the heater core 24 from the max cool state (D in FIG. 1) that blows only to the evaporator 23 due to the position change around the rotation center of the concentric fitting portions 20a and 20b of the outlet 18. The blowing direction can be changed to the state (E in FIG. 1).

  The air that has passed through the evaporator 23 and the heater core 24 is air-mixed in the air mixing chamber 25 and blown out from the opening 26 into the vehicle compartment as air having a temperature corresponding to the blowing position of the rotary scroll casing 14.

  Next, the air flow in the blower unit 1 will be described with reference to FIG. When the centrifugal fan 11 is rotated by the double-axis blower motor 2 for blowing air, the pressure inside the centrifugal fan 11 is reduced, and the air (atmospheric pressure) outside the main body case 4 is sucked from the filter 16 and the intake port 15 to be centrifuged. The air is blown to the air passage 17a in the rotary scroll casing 14 by the fan 11 and blown out of the blower unit 1 from the blowout port 18 (main air flow F1).

  Further, in accordance with the pressure drop in the fan interior 11 a accompanying the rotation of the centrifugal fan 11, the cooling air vent hole 10 provided in the motor case 5 and the bottom portion 12 of the centrifugal fan 11 are provided from the motor chamber 7 which is almost atmospheric pressure. Air flows (inhales) into the interior 11a of the centrifugal fan 11 that is in communication with the bottom hole 13 provided. Then, the outside air of the main body case 4 is purified and sucked from the intake port 15 and the filter 16 through the cooling air intake port 8 and the bypass passage 19 communicating with the motor chamber 7 (cooling air flow F2).

  As a result, the cooling air flows through the motor chamber 7 to cool the double-axis blower motor 2. In addition, the brush temperature of the blower motor 2 by the cooling air flow F2 in the blower unit 1 of the present embodiment is 69.3 ° C. Compared with the brush temperature 85.3 ° C. when the cooling air flow F2 is not formed, A temperature lowering (cooling) effect of 16 ° C. could be obtained.

  Thus, the centrifugal fan 11 has the main air flow F1 sucked from the intake port 15 and the cooling air flow F2 sucked into the inside 11a of the centrifugal fan 11 while cooling the double-axis blower motor 2 through the motor chamber 7. And can be blown out from the air outlet 18.

  Further, the cooling air flow F2 inside and outside the motor chamber 7 makes the motor chamber 7 substantially the same pressure (atmospheric pressure) as the outside of the main body case 4 by providing the motor case 5 with the cooling air intake 8 and the motor case 5 In the motor chamber 7, the cooling air vent hole 10 and the bottom hole 13 are provided in the bottom portion 12 of the centrifugal fan 11 so that the motor chamber 7 communicates with the interior 11 a of the centrifugal fan 11 in a negative pressure state. A cooling air flow F2 is formed. Therefore, even if the rotary scroll casing 14 is rotated in order to change the direction of the air outlet 18, the flow path of the cooling air flow F <b> 2 formed by the cooling air inlet 8, the cooling air vent hole 10, and the bottom hole 13 changes. Without this, the same cooling effect of the double-shaft blower motor 2 can be obtained. In other words, the blowing direction of the rotary scroll casing 14 can be changed while maintaining the cooling effect of the double-axis blower motor 2.

  In the above embodiment, an example in which the double-shaft blower motor 2 is used and the first and second centrifugal fans 11 are provided on both sides of the shaft 3 has been described. However, the present invention is not limited to this. In other words, the present invention can be applied to a blower unit including a single rotary scroll casing that houses one centrifugal fan driven by a normal motor.

  In the above-described embodiment, an example in which air outside the main body case 4 is introduced into the motor chamber 7 through the bypass passage 19 and the cooling air intake 8 provided in the flange portion 6 of the motor case 5 has been shown. Not limited to. That is, the cooling air intake 8 may be provided not on the flange portion 6 but on the common outer wall portion of the motor case 5 and the main body case 4 to directly introduce the outside air of the main body case 4. In this case, in order to introduce clean air into the motor chamber 7, an air filter that covers the cooling air intake 8 may be directly attached.

  Furthermore, in the said embodiment, although the air blown from the blower outlet 18 was shown as an air mix through the evaporator 23 and the heater core 24 which are heat exchangers for an air conditioning, it was not restricted to this. That is, in the vicinity of the air outlet 18, a plurality of vehicle interior air outlets such as a face air outlet and a foot air outlet are provided at different positions, and the position of the air outlet 18 is changed according to the rotational position of the rotary scroll casing 14. Thereby, you may make it switch a vehicle interior blower outlet.

It is AA sectional drawing of the blower unit of this embodiment. It is BB sectional drawing in FIG. FIG. 3 is a C arrow view of a centrifugal fan portion in FIG. 2. It is a figure which shows the air flow in FIG.

Explanation of symbols

1 ... Blower unit, 2 ... Double-axis blower motor, 3 ... Shaft (rotary shaft),
4 ... Body case, 5 ... Motor case, 6 ... Flange, 7 ... Motor chamber,
8 ... Cooling air intake, 9 ... Lid, 10 ... Cooling air vent, 11 ... Centrifugal fan,
11a ... Inside of the fan, 12 ... Bottom of the fan, 13 ... Bottom hole,
14 ... Rotating scroll casing, 15 ... Intake port, 16 ... Filter,
17a ... Air passage, 18 ... Air outlet, 19 ... Bypass passage, 20a, b ... Fitting part,
21a, b ... guide member, 22 ... casing rotation motor,
F1 ... Air flow, F2 ... Cooling air flow.

Claims (7)

A scroll casing (14) forming an air passage (17a) for air sucked from the air inlet (15) and blown;
A centrifugal fan (11) that is arranged inside the scroll casing and blows air into the air passage;
A motor (2) for driving the centrifugal fan;
A motor case (5) for housing the motor;
The motor case includes a cooling air intake (8) communicating with the outside air of the scroll casing, and the motor case inner space (7) and the scroll casing inner space are in communication with each other.
A bottom hole (13) is formed in the bottom (12) of the centrifugal fan, and the motor case inner space (7) and the inside (11a) of the centrifugal fan can communicate with each other through the bottom hole. Being
Blower unit characterized by that. 2. The blower unit according to claim 1, wherein an outer peripheral portion (20 a) of the motor case around the rotation shaft (3) of the motor is fitted to the scroll casing. Of the partition walls constituting the motor case, a lid portion (9) between the motor rotating shaft and the outer peripheral portion faces the space inside the scroll casing, and the lid portion includes the space inside the motor case. The blower unit according to claim 2, wherein a hole (10) is provided for communicating with the space inside the scroll casing. The blower unit according to any one of claims 1 to 3, further comprising a casing rotation mechanism (22) for rotating the scroll casing with respect to the motor case about the motor rotation axis. A main body case (4) that is fixed to the motor case and houses the motor case and the scroll casing;
2. A bypass passage (19) is formed between the main body case and the scroll casing, one of which opens to the intake port side and the other of which is provided with the cooling air intake port. The blower unit as described in any one of thru | or 4. The blower unit according to claim 5, wherein a filter (16) for filtering the intake air is provided at the intake port. First and second scroll casings (14) that respectively form air passages (17a) for air sucked and blown from the air inlet (15);
First and second centrifugal fans (11), which are arranged inside the first and second scroll casings, respectively, and which blows air to the air passage;
A biaxial motor (2) for driving the first and second centrifugal fans at both ends of the rotary shaft,
A motor case (5) for housing the both-axis motor;
A casing rotating mechanism (22) for rotating the scroll casing around the motor rotating shaft (3) with respect to the motor case;
The motor case includes a cooling air intake (8) that communicates with outside air, and the first and second outer peripheral portions (20a) around the motor rotation shaft (3) of the motor case are the first and the second, respectively. And the motor casing inner space (7) and the first and second scroll casing inner spaces are in communication with each other,
A bottom hole (13) is formed in each bottom (12) of the first and second centrifugal fans, and the inner space of the motor case and the first and second centrifuges are formed through the bottom holes. The inside of the fan (11a) can be communicated.
Blower unit characterized by that.

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