JP6319513B2 - Blower - Google Patents

Description

Cross-reference to related applications

  This application is based on the Japanese application number 2015-86025 for which it applied on April 20, 2015, and uses the description here.

  The present disclosure relates to a blower that blows air.

  2. Description of the Related Art Conventionally, a blower that heats blown air through a fan by supplying a high-frequency alternating current to an induction heating coil and heating a conductive fan has been proposed (see, for example, Patent Document 1). .

  Thus, in the blower having a heating function for heating the air to be blown, various devices are made so that the temperature distribution of the air blown out from the blower does not occur. For example, Patent Document 1 discloses disposing an induction heating coil at a position close to a blade in a fan.

Japanese Patent No. 5310737

  By the way, for example, in an air conditioner for a vehicle, when air is blown out simultaneously from a plurality of blowing sections, the temperature of the air blown upward in the vehicle interior is lowered, and the temperature of the air blown out downward in the vehicle compartment is increased. Therefore, there is a case where a comfortable temperature distribution of the cold head heat type in the passenger compartment is intended.

  Moreover, in the vehicle air conditioner, the temperature of the vehicle interior and the in-vehicle device may be adjusted by blowing out the temperature-adjusted air to the space where the in-vehicle device is arranged in addition to the space in the vehicle interior.

  Thus, in an air conditioner for a vehicle, it may be required to supply air blown from a blower at different temperatures. This is not limited to a device mounted on a moving body, such as a vehicle air conditioner, but also applies to a stationary air conditioner used in a home or factory.

  Then, the present inventors are considering applying the air blower which has a heating function which heats the air to blow as a ventilation means of the apparatus requested | required to blow off air at different temperature.

  However, in the conventional blower device to which the heating function is added, as in Patent Document 1, the temperature of the air blown out from the blower is constantly made uniform. For this reason, even if the blower having the heating function of Patent Document 1 is applied to an apparatus that is required to blow out air at different temperatures, the air adjusted to different temperatures cannot be supplied from the blower. .

  An object of this indication is to provide the air blower which can supply the air adjusted to different temperature.

According to one aspect of the present disclosure, a blower that blows air is:
A blower case constituting the outer shell;
A plurality of fans housed in a blower case and sucked in and blown out by rotating,
An electric motor that rotationally drives a plurality of fans;
A heating device for heating at least some of the plurality of fans;
And a heat insulating structure that suppresses heat transfer between the plurality of fans.

  Thus, while adding the heating function of the air blown to at least some of the fans, the air blown from each fan is adjusted to a different temperature by adopting a heat insulating structure that suppresses heat transfer between the fans. It becomes possible.

  Therefore, according to the present disclosure, it is possible to supply air adjusted to different temperatures in a blower device that is required to blow out air at different temperatures.

  Moreover, according to another viewpoint of this indication, the heating apparatus of an air blower is comprised so that a one part fan may be heated among several fans. Of the plurality of fans, the remaining fans other than some of the fans are made of a material having lower thermal conductivity than some of the fans, and the heat insulating structure is made up of the remaining fans.

  According to this, since it is possible to suppress the heat of the fan heated by the heating device from moving to the fan that is not heated, it becomes possible to blow out air adjusted to different temperatures in each fan. .

  Here, the magnitude of the thermal conductivity may be determined by comparing the thermal conductivity of each fan at the same temperature, for example. When the fan is composed of a plurality of members, the thermal conductivity is determined based on the average value of the thermal conductivity of each member of the fan or the thermal conductivity of the representative portion with the largest area of the fan as the representative portion. It may be judged by comparing the values of. Note that the thermal conductivity means a property in which heat moves easily from a higher temperature to a lower temperature when there is a temperature gradient in the substance. Note that the thermal conductivity is a value inherent to the substance (that is, a physical property value), but what is made of a plurality of substances such as an alloy may be measured by a thermal conductivity test by a laser flash method.

  Further, according to another aspect of the present disclosure, some of the fans of the air blower are mainly configured of a metal material having higher thermal conductivity than the remaining fans, and the remaining fans Compared with the resin material, it is mainly composed of a resin material having low thermal conductivity.

  Here, each fan can be made of a metal material, but in that case, there is a concern that the fan efficiency may deteriorate due to an increase in the weight of the blower itself. For this reason, it is desirable that some of the fans are mainly composed of a metal material having high thermal conductivity, and the remaining fans are mainly composed of a resin material having low thermal conductivity.

  Here, “consisting mainly of a metal material having a high thermal conductivity” means that when the fan includes a material other than a metal material having a high thermal conductivity, the largest occupancy of the material constituting the fan. A large material means a metal material with high thermal conductivity. Of course, “mainly composed mainly of a metal material having high thermal conductivity” includes a case where the fan is composed only of a metal material having high thermal conductivity.

  In addition, “consisting mainly of resin material” means that when the fan contains a material other than a resin material having low thermal conductivity, the material occupying the largest part of the material constituting the fan has thermal conductivity. It means that the resin material is low. Of course, “mainly composed of a resin material having low thermal conductivity” includes a case where the fan is composed only of a resin material having low thermal conductivity.

It is a typical whole block diagram of a vehicle air conditioner provided with the air blower which concerns on 1st Embodiment. It is a typical whole block diagram of the air blower which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the action | operation of the air blower which concerns on 1st Embodiment. It is a typical whole block diagram of the air blower which concerns on 2nd Embodiment. It is a typical whole block diagram of the air blower which concerns on 3rd Embodiment.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that, in each of the following embodiments, parts that are the same as or equivalent to the matters described in the preceding embodiment are denoted by the same reference numerals, and the description thereof may be omitted. Moreover, in each embodiment, when only a part of the component is described, the component described in the preceding embodiment can be applied to the other part of the component.

(First embodiment)
This embodiment demonstrates the example which applied the air blower 2 of this indication to the air blower in the vehicle air conditioner 1 which air-conditions a vehicle interior. As shown in FIG. 1, the vehicle air conditioner 1 includes an air conditioning unit 10 and a blower 2 as main components. In addition, the arrow which shows the top and the bottom shown in FIG. 1 has shown the up-down direction at the time of mounting the vehicle air conditioner 1 in a vehicle.

  First, the air conditioning unit 10 will be described. The air conditioning unit 10 is disposed in a lower part of an instrument panel (that is, an instrument panel) in the passenger compartment. The air conditioning unit 10 includes an evaporator 13 and a heater core 14 in an air conditioning case 11 that forms an outer shell thereof.

  The air conditioning case 11 constitutes a ventilation path for blown air to be blown into the vehicle interior. The air conditioning case 11 of the present embodiment is formed of a resin (for example, polypropylene) having a certain degree of elasticity and excellent in strength.

  Further, the air conditioning case 11 of the present embodiment is provided with a partition plate 111 that divides the ventilation path formed therein into an upper ventilation path and a lower ventilation path. That is, the air conditioning unit 10 of the present embodiment constitutes an upper and lower two-layer air conditioning unit.

  On the most upstream side of the air flow of the air conditioning case 11, an inside / outside air switching box 12 for switching and introducing outside air (that is, outside air) and inside air (that is, inside air) is arranged. The inside / outside air switching box 12 is formed with an outside air introduction port 121 for introducing outside air and an inside air introduction port 122 for introducing inside air. Furthermore, inside / outside air switching box 12 is arranged with inside / outside air switching door 123 that adjusts the opening area of each inlet 121, 122 and changes the ratio between the amount of outside air introduced and the amount of inside air introduced. Yes.

  The inside / outside air switching door 123 is rotatably disposed between the outside air introduction port 121 and the inside air introduction port 122. The inside / outside air switching door 123 is driven by an actuator (not shown).

  On the downstream side of the air flow in the inside / outside air switching box 12, an evaporator 13 that constitutes a cooling unit for cooling the air blown into the vehicle interior is disposed. The evaporator 13 is a heat exchanger that absorbs the latent heat of evaporation of the low-temperature refrigerant circulating inside from the blown air and cools the blown air. The evaporator 13 constitutes a vapor compression refrigeration cycle together with a compressor, a condenser, and a decompression mechanism (not shown).

  The evaporator 13 of this embodiment is arrange | positioned so that the through-hole formed in the partition plate 111 arrange | positioned at the air-conditioning case 11 may be penetrated. In the evaporator 13, the upper part is positioned in the upper ventilation path in the air conditioning case 11, and the lower part is positioned in the lower ventilation path in the air conditioning case 11.

  On the downstream side of the air flow of the evaporator 13, there is a hot air passage 16 through which the air cooled by the evaporator 13 flows to the heater core 14 side, and a cold air bypass that flows the air cooled by the evaporator 13 bypassing the heater core 14. A passage 17 is formed.

  The heater core 14 is a heat exchanger that heats blown air using an engine coolant (not shown) as a heat source. In the present embodiment, the heater core 14 constitutes a heating unit that heats the blown air. The heater core 14 of this embodiment is arrange | positioned so that the through-hole formed in the partition plate 111 arrange | positioned at the air-conditioning case 11 similarly to the evaporator 13 may be penetrated. The upper part of the heater core 14 is positioned in the upper ventilation path in the air conditioning case 11, and the lower part is positioned in the lower ventilation path in the air conditioning case 11.

  In the air conditioning case 11, the ventilation path that passes through the upper part of the heater core 14 constitutes the first hot air passage 161, and the ventilation path that passes through the lower part of the heater core 14 constitutes the second hot air passage 162. To do.

  In addition, the space above the heater core 14 in the air conditioning case 11 constitutes a first cold air bypass passage 171 that flows air bypassing the portion above the heater core 14. Furthermore, the space below the heater core 14 in the air conditioning case 11 constitutes a second cold air bypass passage 172 that bypasses the lower portion of the heater core 14 and flows air.

  Between the evaporator 13 and the heater core 14, first and second air mix doors 181 and 182 are rotatably arranged as a temperature adjusting member 18.

  The first air mix door 181 is driven by an actuator (not shown) to adjust the ratio of the air flowing through the first hot air passage 161 and the air flowing through the first cold air bypass passage 171 and blows air into the vehicle interior. It is a member that adjusts the temperature of the blown air.

  The second air mix door 182 is driven by an actuator (not shown) and adjusts the ratio of the air flowing through the second hot air passage 162 and the air flowing through the second cold air bypass passage 172 to blow into the vehicle interior. It is a member that adjusts the temperature of the blown air.

  On the downstream side of the hot air passage 16 and the cold air bypass passage 17, a blower 20 constituting the blower 2 is arranged. The blower 20 is a device that generates an air flow that blows into the passenger compartment inside the air conditioning case 11. Details of the blower 2 will be described later.

  An air conditioning duct 19 is connected to the air discharge side of the blower 20. The air-conditioning duct 19 is a member that guides the blown air to a blowing portion (not shown) that opens into the vehicle interior and blows air into the vehicle interior.

  In the present embodiment, the air-conditioning duct 19 includes an upper duct 191 connected to an upper blowing portion that blows air to the upper space in the vehicle interior, and a lower blowing portion that blows air to the lower space in the vehicle cabin. A lower duct 192 to be connected is provided.

  Although not shown in the drawing, a face blowout port that blows air toward the upper body side of the occupant and a defroster blowout port that blows air toward the window glass on the front surface of the vehicle are provided as the upper blowout unit. Although not shown in the drawing, a foot outlet for blowing air to the lower body side of the occupant is provided as the lower outlet.

  Further, the air conditioning duct 19 is provided with a mode switching door (not shown) for setting the air blowing mode from each outlet. The mode switching door is driven by an actuator (not shown).

  Then, the air blower 2 is demonstrated. The blower 2 includes a blower 20, a power transmission circuit 50, and a control circuit 100. The blower 20 includes a blower case 21 that forms an outer shell, a plurality of fans 22 and 23 housed in the blower case 21, an electric motor 25 that drives the fans 22 and 23, and the like.

  The blower case 21 constitutes a part of the air conditioning case 11. The blower case 21 of the present embodiment is formed of a resin (for example, polypropylene) having a certain degree of elasticity and excellent in strength.

  The blower case 21 includes first and second suction ports 211 and 212 that are opened on both sides in the axial direction of the rotary shaft 252 in the electric motor 25, and first and second discharge ports 213 that are opened in the radial direction of the rotary shaft 252, 214 is formed.

  The first suction port 211 communicates with the space on the air flow downstream side of the first hot air passage 161 and the first cold air bypass passage 171 in the air conditioning case 11. The first discharge port 213 is connected to the upper duct 191 and communicates with the upper space in the vehicle compartment via the upper duct 191.

  The second suction port 212 communicates with a space on the air flow downstream side of the second hot air passage 162 and the second cold air bypass passage 172 in the air conditioning case 11. The second discharge port 214 is connected to the lower duct 192 and communicates with the lower space in the vehicle compartment via the lower duct 192.

  Further, the blower case 21 is divided into air blowers formed in the blower 21 so that air blown out from the fans 22 and 23, which will be described later, is divided into upper blower passages 215 and lower blower ducts 215. A partition member 210 that partitions the two air passages 216 is provided. The first air passage 215 is an air passage that guides air sucked from the first air inlet 211 to the upper space in the vehicle compartment via the first outlet 213 and the upper duct 191. The second air passage 216 is an air passage that guides air sucked from the second air inlet 212 to the lower space in the vehicle compartment via the second outlet 214 and the lower duct 192.

  A first fan 22 that sucks air from the first suction port 211 and discharges the sucked air from the first discharge port 213 is disposed in the first air passage 215. In addition, the second air passage 216 is provided with a second fan 23 that sucks air from the second suction port 212 and discharges the sucked air from the second discharge port 214.

  Each of the fans 22 and 23 is configured by a centrifugal fan (for example, a sirocco fan or a turbo fan) that blows out air sucked from the axial direction outward in the radial direction. Each fan 22 and 23 of this embodiment is arrange | positioned coaxially, and is connected with the rotating shaft 252 of the electric motor 25 so that it may rank with an axial direction. Each fan 22, 23 is rotationally driven by an electric motor 25.

  Specifically, as shown in FIG. 2, the first fan 22 includes a plurality of blades 221, a first main plate 223, and a first shroud 224. Each blade 221 of the first fan 22 is annularly arranged around the axis CL of the rotating shaft 252 in the electric motor 25 so that air can flow between the blades 221.

  Each blade 221 is connected to the first shroud 224 at the end on the first suction port 211 side (that is, one end side in the axial direction) in the axial direction along the axis CL, and is opposite to the first suction port 211 in the axial direction. Is connected to the first main plate 223.

  The first main plate 223 is configured by a member having a conical shape whose central portion is recessed toward the first suction port 211 in the axial direction. The first main plate 223 has a first plate portion 223 a that connects the end of each blade 221 opposite to the first suction port 211, and a first boss portion 223 b that is connected to the rotating shaft 252 of the electric motor 25. The first main plate 223 of this embodiment constitutes a connecting portion that connects the end of each blade 221 opposite to the first suction port 211 and transmits the rotational driving force from the electric motor 25 to each blade 221. .

  The first boss portion 223 b is a fitting portion that is formed at the center portion of the first main plate 223 and is fitted to the rotation shaft 252 of the electric motor 25. The first boss portion 223b and the rotation shaft 252 of this embodiment are prevented from rotating by a non-rotating pin (not shown). Therefore, when the rotating shaft 252 rotates, the first main plate 223 rotates in conjunction with the rotation of the rotating shaft 252.

  The first shroud 224 is a member having a disk shape in which an opening having a size corresponding to the first suction port 211 is formed at the center. The first shroud 224 is a member that connects end portions of the blades 221 on the first suction port 211 side. In addition, the material which comprises each component of the 1st fan 22 is mentioned later.

  Similar to the first fan 22, the second fan 23 includes a plurality of blades 231, a second main plate 233, and a second shroud 234. The blades 231 of the second fan 23 are annularly arranged around the axis CL of the rotating shaft 252 in the electric motor 25 so that air can flow between the blades 231.

  Each blade 231 has an end on the second suction port 212 side in the axial direction connected to the second shroud 234 and an end opposite to the second suction port 212 in the axial direction connected to the second main plate 233. Yes.

  The second main plate 233 is configured by a member having a conical shape whose central portion is recessed toward the second suction port 212 in the axial direction. The second main plate 233 includes a second plate portion 233 a that connects the end of each blade 231 opposite to the second suction port 212, and a second boss portion 233 b that is connected to the rotary shaft 252. The second main plate 233 of the present embodiment constitutes a connecting portion that connects the end portion of each blade 231 opposite to the second suction port 212 and transmits the rotational driving force from the electric motor 25 to each blade 231. .

  Further, the second plate portion 233a is formed with a groove portion 235 for accommodating an induction heating coil 52 described later on the back side of the portion where the blades 231 are coupled. The groove part 235 is formed in an annular shape centering on the second boss part 233b.

  The second boss portion 233 b is a fitting portion that is formed at the center portion of the second main plate 233 and is fitted to the rotating shaft 252 of the electric motor 25. The second boss portion 233b and the rotation shaft 252 of this embodiment are prevented from rotating by a non-rotating pin (not shown). Therefore, when the rotating shaft 252 rotates, the second main plate 233 rotates in conjunction with the rotation of the rotating shaft 252.

  The second shroud 234 is a member having a disk shape in which an opening having a size corresponding to the second suction port 212 is formed at the center. The second shroud 234 is a member that connects end portions of the blades 231 on the second suction port 212 side. In addition, the material which comprises each component 231, 233, 234 of the 2nd fan 23 is mentioned later.

  The electric motor 25 includes a motor main body 251, a metal (for example, iron) rotating shaft 252, a support 253 connected to the partition member 210, and a drive circuit (not shown). The motor main body 251 is a drive unit that rotationally drives the second fan 23 via the rotation shaft 252.

  The motor body 251 is supported by the partition member 210 of the blower case 21 via the support 253. The motor main body 251 of this embodiment is accommodated in a space formed between the partition member 210 and the second main plate 233. The motor body 251 can rotate the core 251c fixed to the support 253, the rotor 251a fixed to the rotating shaft 252 outside the core 251c, the magnet 251b fixed to the inner peripheral side of the rotor 251a, and the rotating shaft 252. The bearing 251d and the like are supported.

  When electric power is supplied from the drive circuit (not shown) to the core 251c of the motor body 251 in the electric motor 25, magnetic flux changes in the core 251c. Thereby, in the electric motor 25, the force which draws the magnet 251b fixed to the rotor 251a is generated, and the rotor 251a rotates together with the rotating shaft 252 by receiving this force.

  Subsequently, the power transmission circuit 50 constitutes a heating device that heats at least some of the fans 22 and 23. The power transmission circuit 50 of the present embodiment includes an induction heating coil 52, a resonance circuit 53, and a power supply circuit 54 that inductively heat some of the fans 22 and 23.

  Here, in the air conditioning unit 10 of this embodiment, the temperature of the air blown out to the upper side space in the vehicle interior is lowered, and the temperature of the air blown out to the lower side space in the vehicle compartment is increased, thereby making the head cold foot heat type comfort in the vehicle compartment. May have a significant temperature distribution.

  Therefore, in the present embodiment, the induction heating coil 52 induction heats the second fan 23 so that the temperature of the air blown into the lower space in the vehicle interior becomes higher than the air blown into the upper space in the vehicle interior. It is configured to do.

  The induction heating coil 52 of the present embodiment constitutes a heating unit that heats the second fan 23 among the plurality of fans 22 and 23. Specifically, the induction heating coil 52 is disposed in the vicinity of the second fan 23 so as to face the second main plate 233 of the second fan 23. The induction heating coil 52 of this embodiment is disposed on the opposite side of each blade 231 in the second main plate 233.

  In addition, the induction heating coil 52 is configured by an annular coil corresponding to the inside of the groove portion 235 formed in the second plate portion 233 a of the second main plate 233. The induction heating coil 52 of the present embodiment is housed in a non-contact manner with the groove portion 235 inside the groove portion 235 formed in the second plate portion 233a of the second main plate 233.

  A predetermined interval is provided between the second fan 23 and the induction heating coil 52 of the present embodiment, and the second fan 23 and the induction heating coil 52 are not in contact with each other. The induction heating coil 52 is fixed to the partition member 210 of the blower case 21. For this reason, the second fan 23 can rotate without contacting the induction heating coil 52.

  The resonance circuit 53 and the power supply circuit 54 constitute an AC supply unit that supplies an AC current having a predetermined frequency (for example, 25 kHz) to the induction heating coil 52. The power supply circuit 54 is a circuit constituting an AC signal generation source. The resonance circuit 53 is adjusted so as to perform magnetic field resonance in a state where the induction heating coil 52 is disposed opposite to the second fan 23.

  In the power transmission circuit 50, a magnetic field is generated around the induction heating coil 52 by supplying an alternating current from the power supply circuit 54 to the induction heating coil 52. At this time, an eddy current (that is, an induced current) flows through the second main plate 233 of the second fan 23 in a direction that cancels the magnetic field generated around the induction heating coil 52. The second main plate 233 of the second fan 23 generates Joule heat that is the square of the electric resistance of the second main plate 233 × eddy current, and generates heat.

  In this manner, by heating the second fan 23, it is possible to increase the temperature of the air blown out to the lower space in the vehicle interior. At this time, there is a concern that the heat of the second fan 23 moves to the first fan 22 and the temperature of the first fan 22 increases. That is, only a part of the fans 22 (second fan 23 in the present embodiment) is heated, and the remaining fans other than the part of fans (first fan 22 in the present embodiment). Even if it is the structure which does not heat, it is difficult to adjust the air to blow off to different temperature.

  In view of this point, in the present embodiment, a heat insulating structure that suppresses heat transfer between the fans 22 and 23 is provided. In the present embodiment, the heat insulation structure is realized by configuring the first fan 22 with a material having lower thermal conductivity than the second fan 23.

  In this embodiment, each component 231, 233, 234 of the second fan 23 is made of a metal material having high thermal conductivity, and each component 221, 223, 224 of the first fan 22 is used as the second fan 23. Compared with a resin material having low thermal conductivity.

  Specifically, in this embodiment, each blade 221 and the first shroud 224 of the first fan 22 are made of polypropylene PP, and the first main plate 223 is a polyacetal POM (ie, Duracon) that has better heat resistance than polypropylene PP. It consists of. Polypropylene PP has a thermal conductivity λ of about 0.13 [W / mK], and polyacetal POM has a thermal conductivity λ of about 0.23 [W / mK]. In addition, in this specification, the value in about 300K is described about the heat transfer rate of each material.

  The first fan 22 of the present embodiment is integrally configured by assembling the main plate 223 by fitting or the like to each blade 221 integrally molded by injection molding or the like and the molded product of the first shroud 224. .

  On the other hand, in this embodiment, each blade 231 and the second shroud 234 of the second fan 23 are made of aluminum, and the second main plate 233 is made of iron. Aluminum has a thermal conductivity λ of about 237 [W / mK], and is a material having an extremely high thermal conductivity λ as compared with resin materials such as polypropylene PP and polyacetal POM. Iron has a thermal conductivity λ of about 80 [W / mK], and is a material having an extremely high thermal conductivity λ as compared with resin materials such as polypropylene PP and polyacetal POM.

  The second fan 23 of the present embodiment is integrally configured by brazing and joining each blade 231 to the second main plate 233 and the second shroud 234.

  Here, in this embodiment, in order to efficiently heat the second fan 23 by induction heating, each blade 231 of the second fan 23 is made of aluminum, and the second main plate 233 is made of iron. The reason will be described below.

  The heating power P of the second fan 23 (for example, the second main plate 233) by induction heating is proportional to the skin resistance Rs of the second main plate 233 and also to the square of the magnetic flux H as shown in the following formula F1.

P∝Rs × H ² (F1)
The skin resistance Rs of the second main plate 233 is proportional to the square root of the frequency f of the electric current I flowing through the induction heating coil 52, the electrical resistivity ρ, the magnetic permeability μ of the second main plate 233, as in the following formula F2.

Rs∝ (ρ × μ × f) ^1/2 (F2)
Further, the magnetic flux H is proportional to the number of turns (that is, the number of turns) N of the induction heating coil 52 and the current I as in the following formula F3.

H∝N × I (F3)
According to the above formulas F1 to F3, the heating power P can be expressed by the following formula F4.

P∝ (ρ × μ × f) ^1/2 × (N × I) ² (F4)
In the second fan 23, the second main plate 233 generates heat by energizing the induction heating coil 52, and the heat of the second main plate 233 is transmitted to the blown air via the blades 231. That is, in this embodiment, the 2nd main board 233 comprises a heat generating part, and each blade | wing 231 comprises the thermal radiation part which radiates the heat | fever of the 2nd main board 233 to blowing air.

  As shown in Formula F4, in order to efficiently heat the second fan 23 by induction heating, the main plate 233 constituting the heat generating part in the second fan 23 is integrated with the electrical resistivity ρ and the magnetic permeability μ (= It is desirable to use a material having a high (ρ × μ).

  On the other hand, in order to efficiently radiate heat from the second fan 23 to the air side, it is effective to increase the heat radiation area by making the temperature of the member in contact with the air side uniform. For this reason, it is desirable that each blade 231 constituting the heat radiating portion in the second fan 23 is made of a material having a high thermal conductivity λ.

  For this reason, in the present embodiment, each blade 231 of the second fan 23 is made of a material having a higher thermal conductivity λ than the second main plate 233, and the second main plate 233 has an electrical resistivity higher than that of each blade 231. It is made of a material having a high integrated value (= ρ × μ) of ρ and permeability μ.

  Incidentally, aluminum has a thermal conductivity λ of about 237 [W / mK], which is much higher than the thermal conductivity of iron (λ≈80 [W / mK]). Iron has an electrical resistivity of about 0.17 [μΩm] and a relative permeability of about 2000, and its integrated value (ρ × μ≈34) is the electrical resistivity of aluminum (ρ≈0.027 [ μΩm]) and relative permeability (μ≈1), which is an extremely large value (ρ × μ≈0.027).

  Each blade 231 of the second fan 23 may be made of a material having a higher thermal conductivity λ than that of the second main plate 233. Each blade 231 of the second fan 23 is made of, for example, a material mainly composed of aluminum having a high thermal conductivity λ (for example, an aluminum alloy), copper (λ≈398 [W / mK], ρ≈0.017 [ [mu] [Omega] m], [mu] ≈1) may be used. The second main plate 233 may be made of a material having a higher integrated value of the electric resistivity ρ and the magnetic permeability μ than the blades 231 of the second fan 23. For example, the second main plate 233 may be formed of the electric resistivity ρ and the magnetic permeability μ. You may comprise with the material (for example, stainless steel) which has iron with a high integrated value as a main component. Since the thermal conductivity λ, the electrical resistivity ρ, and the magnetic permeability μ are temperature dependent, it is desirable to employ a material that satisfies the above conditions when compared under the same temperature condition.

  Subsequently, the control circuit 100 includes a microcomputer including a storage unit such as a CPU, a ROM, and a RAM, and its peripheral circuits. The control circuit 100 is a circuit that performs various arithmetic processes based on the control program stored in the storage unit, and controls the operation of the drive circuit connected to the output side, the power supply circuit 54, and the like. The control circuit 100 constitutes an energization control unit that controls the operation of the power supply circuit 54 and the like in response to a request from the air conditioning unit 10 during operation of the blower 20. Note that the storage unit of the control circuit 100 is configured by a non-transitional tangible storage medium.

  Next, the operation of the blower device 2 of the present embodiment according to the above configuration will be described. First, when electric power is supplied from the drive circuit to the core 251 c of the motor main body 251, the rotating shaft 252 of the electric motor 25 rotates. The fans 22 and 23 rotate in conjunction with the rotation of the rotation shaft 252.

  As the fans 22 and 23 rotate, the air sucked in along the axis CL from the suction ports 211 and 212 of the blower case 21 toward the outside in the radial direction of the fans 22 and 23 as shown in FIG. Blown out. Then, the air blown out from the first fan 22 is blown out to the upper space in the passenger compartment through the first discharge port 213 of the blower case 21 and the upper duct 191. Further, the air blown out from the second fan 23 is blown out to the lower space in the passenger compartment through the second discharge port 214 of the blower case 21 and the lower duct 192.

  In this state, when an alternating current is supplied from the power supply circuit 54 of the power transmission circuit 50 to the induction heating coil 52, a magnetic field is generated around the induction heating coil 52. At this time, an eddy current (that is, an induced current) flows through the main plate 233 of the second fan 23 in a direction that cancels the magnetic field generated around the induction heating coil 52.

  Due to this eddy current, Joule heat is generated on the second main plate 233 of the second fan 23 to generate Joule heat that is the square of the electric resistance of the second main plate 233 times the eddy current. Then, the heat of the second main plate 233 is radiated to the air sucked from the second suction port 212 of the blower case 21 through each blade 231 of the second fan 23.

  As a result, the air sucked into the second fan 23 is heated, and the air heated by the second fan 23 is blown out to the lower space in the vehicle compartment via the lower duct 192. At this time, since the first fan 22 is made of a material having lower thermal conductivity than the second fan 23, the heat of the second fan 23 is hardly transmitted to the first fan 22. For this reason, the air sucked into the first fan 22 is blown out to the upper space in the vehicle compartment via the upper duct 191 without being heated by the blower 20.

  The blower device 2 of the present embodiment described above adds a heating function for heating the blown air to some of the fans 22 and 23 (second fan 23 in the present embodiment), and each fan. The heat insulating structure that suppresses the heat transfer between 22 and 23 is provided.

  Specifically, in the present embodiment, the second fan 23 is made of a material having higher thermal conductivity than the first fan 22, thereby suppressing heat transfer between the fans 22 and 23. Is configured.

  According to this, since the heat transfer between the fan added with the heating function (that is, the second fan 23) and the fan not added with the heating function (that is, the first fan 22) is suppressed, It becomes possible to adjust the air blown out from the fans 22 and 23 to different temperatures.

  Therefore, according to the air blower 2 of this embodiment, in the air blower of the apparatus requested | required to blow off air at different temperature, it becomes possible to supply the air adjusted to different temperature.

  Here, each of the fans 22 and 23 can be made of a metal material. In this case, however, there is a concern that the fan efficiency may deteriorate due to an increase in the weight of the blower 20 itself. Therefore, as in this embodiment, the first fan 22 with a heating function is mainly composed of a metal material with high thermal conductivity, and the second fan 23 without a heating function is a resin material with low thermal conductivity. It is desirable to constitute mainly.

  Moreover, in this embodiment, the air blower 2 is applied to the vehicle air conditioner 1, and the air blower 2 lowers the temperature of the air blown into the upper space in the vehicle interior and the temperature of the air blown into the lower space. Can be high. For this reason, in the vehicle air conditioner 1, it is possible to realize a comfortable temperature distribution of the head cold foot type in the passenger compartment.

  Further, in the present embodiment, the induction fan coil 52 is used to heat the second fan 23 by induction heating. As described above, the configuration in which the second fan 23 is directly heated by induction heating has less heat loss than the configuration in which the second fan 23 is indirectly heated by radiant heat or the like. It becomes possible to heat the fan 23 efficiently.

  Here, the heat transfer from each blade 231 to the air side in the second fan 23 is caused by the rotation of each blade 231 as compared to the case where heat moves from the flat plate fixed so as not to move to the air side. The boundary layer formed on the surface of each blade 231 is thinned by the generated centrifugal force. For this reason, the heat transfer from each blade 231 to the air side facilitates the movement of heat from each blade 231 to the air side as compared to the case where heat moves from the flat plate to the air side.

  In addition, since there are a plurality of blades 231, the area of each blade 231 in contact with air can be sufficiently secured, and the air can be heated with a sufficient amount of heat transfer. Furthermore, since each blade 231 is made of a material having a high thermal conductivity, the temperature of each blade 231 becomes nearly uniform over the entire region of the blade 231, and heat can be efficiently transferred to the air side.

  Further, in the blower device 2 of the present embodiment, each blade 231 of the second fan 23 is made of a material having a higher thermal conductivity than the second main plate 233, and the second main plate 233 has a magnetic permeability and electric power higher than each blade 231. It is made of a material with a high integrated value with resistivity.

  According to this, the second main plate 233 connecting the blades 231 of the second fan 23 is efficiently heated by induction heating, and the heat of the second main plate 233 heated by induction heating is changed to each of high heat conductivity. It becomes possible to efficiently dissipate heat to the air side via the blade 231.

  Therefore, according to the air blower 2 of this embodiment, it is possible to achieve both the efficiency of heating the second fan 23 by induction heating and the efficiency of heat radiation from the second fan 23 to the air.

  Here, since the eddy current flowing through the second main plate 233 increases as the distance between the induction heating coil 52 and the second main plate 233 of the second fan 23 constituting the heated portion increases, the efficiency of induction heating increases. Become.

  Therefore, in the present embodiment, the induction heating coil 52 is disposed at a position close to the second main plate 233 among the blades 231 and the second main plate 233. As described above, if the induction heating coil 52 is disposed at a position closer to the second main plate 233 than the blades 231, the efficiency of the heating of the second main plate 233 by induction heating can be further increased.

  Further, the second main plate 233 is formed with a groove portion 235 having a shape corresponding to the induction heating coil 52, and the induction heating coil 52 is accommodated in the groove portion 235 in a non-contact manner with the groove portion 235.

  According to this, since the area facing the induction heating coil 52 in the second main plate 233 constituting the heated portion in the second fan 23 can be increased, a sufficient heated area in the second main plate 233 is ensured. be able to.

  Furthermore, since the distance between the second main plate 233 and the induction heating coil 52 can be reduced, the current flowing through the second main plate 233 can be increased by the electromagnetic induction action of the induction heating coil 52. Therefore, it is possible to further increase the efficiency of heating the second main plate 233 by induction heating.

  At this time, since the second main plate 233 itself also functions as a magnetic shield that shields leakage of magnetic flux generated by energization of the induction heating coil 52, the magnetic flux interlinking the induction heating coil 52 affects peripheral devices of the blower 2. Can be suppressed.

  In the present embodiment, the second fan 23 is a centrifugal fan. The induction heating coil 52 is arranged on the other end side in the axial direction of the second fan 23 and on the opposite side of the blades 231 on the second main plate 233. According to this, since the induction heating coil 52 does not become a factor that disturbs the airflow generated by the second fan 23, it is possible to avoid a decrease in fan performance due to the addition of the induction heating coil 52.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In this embodiment, the point which employ | adopts the heat insulation structure which suppresses the heat transfer via the rotating shaft 252 between each fan 22 and 23 is different from 1st Embodiment. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  As shown in FIG. 4, in the present embodiment, a collar 223 c for press-fitting the rotary shaft 252 between the first fan 22 and the rotary shaft 252, that is, inside the first boss portion 223 b of the first main plate 223. Is interposed. The collar 223c is a cylindrical member in which a through hole having a size capable of press-fitting the rotation shaft 252 is formed. The collar 223 c constitutes a connecting member that connects the first boss portion 223 b of the first fan 22 to the rotating shaft 252.

  Here, when the fans 22 and 23 are connected to the same rotating shaft 252 as in the present embodiment, the heat of the second fan 23 may be transmitted to the first fan 22 side via the rotating shaft 252. Is done.

  Therefore, in the present embodiment, the collar 223c that is in direct contact with the rotating shaft 252 is made of a material having lower thermal conductivity than the rotating shaft 252 made of metal (made of iron in the present embodiment). Specifically, in this embodiment, the collar 223c is made of polyphenylene sulfide PPS that has lower thermal conductivity than the rotating shaft 252 and higher heat resistance temperature than the polyacetal POM that forms the first main plate 223. . Polyphenylene sulfide PPS has a thermal conductivity λ of about 0.29 [W / mK], which is much lower than the thermal conductivity of iron (λ≈80 [W / mK]). In addition, polyphenylene sulfide PPS has a heat-resistant temperature of about 260 ° C., which is much higher than polyacetal POM (heat-resistant temperature: about 110 ° C.).

  Other configurations are the same as those of the first embodiment. In the blower device 2 of the present embodiment, the collar 223 c provided on the first boss portion 223 b of the first fan 22 functions as a heat insulating structure that suppresses heat transfer between the fans 22 and 23. For this reason, according to the air blower 2 of this embodiment, compared with 1st Embodiment, the fan (namely, 2nd fan 23) which added the heating function, and the fan (namely, 1st) which did not add the heating function. It is possible to further suppress the heat transfer with the one fan 22).

  In the present embodiment, the example in which the collar 223c is added to the first fan 22 side among the fans 22 and 23 has been described. However, the present invention is not limited thereto, and for example, a color is provided on the second fan 23 side. A color may be provided for both the fans 22 and 23.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. The present embodiment is different from the first embodiment in that a function of heating the blown air is added to each of the fans 22 and 23. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  As shown in FIG. 5, in the first fan 22 of the present embodiment, a groove portion 225 that accommodates a first induction heating coil 51 to be described later is provided on the back side of the portion where the blades 221 in the first plate portion 223 a are coupled. Is formed. The groove part 225 is formed in an annular shape centering on the first boss part 223b.

  Further, in the first fan 22 of the present embodiment, each blade 221 is made of a material having a thermal conductivity λ higher than that of the first main plate 223, and the first main plate 223 is formed from each blade 221, similarly to the second fan 23. Is made of a material having a high integrated value (= ρ × μ) of the electric resistivity ρ and the magnetic permeability μ. Specifically, in this embodiment, each blade 221 of the first fan 22 is made of aluminum, and the first main plate 223 is made of iron.

  Here, in the present embodiment, a collar 233c for press-fitting the rotation shaft 252 is interposed between the second fan 23 and the rotation shaft 252, that is, inside the second boss portion 233b of the second main plate 233. Yes. The collar 233c is a cylindrical member in which a through hole having a size capable of press-fitting the rotation shaft 252 is formed. The collar 233 c constitutes a connecting member that connects the second boss portion 233 b of the second fan 23 to the rotation shaft 252. The collar 233c of the present embodiment is made of a material having lower thermal conductivity than the rotating shaft 252 made of metal (made of iron in the present embodiment). Specifically, the collar 233c of the present embodiment is made of polyphenylene sulfide PPS having lower thermal conductivity than the rotating shaft 252 and higher heat resistance temperature than the polyacetal POM constituting the second main plate 233.

  Subsequently, the power transmission circuit 50 of the present embodiment includes a first induction heating coil 51 that induction heats the first fan 22, a second induction heating coil 52 that induction heats the second fan 23, a resonance circuit 53, a power circuit 54, A switch 55 is provided. In the present embodiment, the induction heating coil that heats the second fan 23 is the second induction heating coil 52.

  Here, in the air conditioning unit 10, in order to heat the interior of the vehicle with high immediate effect, it is required to increase the temperatures of the air blown into the upper space in the vehicle cabin and the air blown into the lower space in the vehicle compartment. May be.

  Therefore, in the present embodiment, each fan is provided by the first and second induction heating coils 51 and 52 so that the air blown to the upper space in the vehicle interior and the air blown to the lower space in the vehicle interior have high temperatures. 22 and 23 are configured to be capable of induction heating.

  The first induction heating coil 51 constitutes a heating unit that heats the first fan 22. Specifically, the first induction heating coil 51 is disposed at a position close to the first fan 22 so as to face the first main plate 223 of the first fan 22. The first induction heating coil 51 of the present embodiment is disposed on the opposite side of each blade 221 in the first main plate 223.

  The first induction heating coil 51 is configured by an annular coil corresponding to the inside of the groove portion 225 formed in the first plate portion 223 a of the first main plate 223. The first induction heating coil 51 of the present embodiment is accommodated in a non-contact manner with the groove portion 225 inside the groove portion 225 formed in the first plate portion 223 a of the first main plate 223.

  A predetermined interval is provided between the first fan 22 and the first induction heating coil 51 of the present embodiment, and the first fan 22 and the first induction heating coil 51 are not in contact with each other. The first induction heating coil 51 is fixed to the partition member 210 of the blower case 21. For this reason, the first fan 22 can rotate without contacting the first induction heating coil 51.

  The switch 55 is a device that switches the supply path of the alternating current from the power circuit 54 to one or both of the induction heating coils 51 and 52. The switch 55 constitutes an AC supply unit together with the resonance circuit 53 and the power supply circuit 54.

  The switch 55 is connected to the control circuit 100 and is configured to switch the supply path of the alternating current from the power supply circuit 54 in accordance with a control signal from the control circuit 100. Note that the control circuit 100 of the present embodiment is configured to control the switch 55 in response to a request from the air conditioning unit 10 side.

  Other configurations are the same as those of the first embodiment. In the blower device 2 of the present embodiment, when the supply path of the alternating current from the power circuit 54 is set to one of the induction heating coils 51 and 52 by the switch 55, the alternating current is induced from the power circuit 54 to one of the induction heating coils 51 and 52. Supplied to the heating coil. At this time, an eddy current flows through the main plate of each of the main plates 223 and 233 of each fan 22 and 23 facing the induction heating coil, and one fan generates heat due to Joule heat.

  As a result, the air sucked into one of the fans 22 and 23 is heated, and the air heated by one of the fans 22 and 23 passes through one of the ducts 191 and 192. Blown out.

  Further, in the blower device 2 of the present embodiment, when the supply path of the alternating current from the power supply circuit 54 is set to both of the induction heating coils 51 and 52 by the switch 55, the alternating current is supplied from the power supply circuit 54 to each of the induction currents. It is supplied to induction heating coils 51 and 52. At this time, eddy currents flow through the main plates 223 and 233 of the fans 22 and 23, and the fans 22 and 23 generate heat due to Joule heat.

  As a result, the air sucked into the fans 22 and 23 is heated, and the air heated by the fans 22 and 23 is blown out into the vehicle compartment via the ducts 191 and 192.

  The air blower 2 of the present embodiment described above is configured such that the fans 22 and 23 can be induction heated by the first and second induction heating coils 51 and 52. For this reason, even if the heat source (that is, the heating capability) of the heater core 14 is insufficient, the temperature of the air blown into the vehicle interior can be increased to heat the vehicle interior.

  Further, in the blower device 2 of the present embodiment, the collar 233 c provided on the second boss portion 233 b of the second fan 23 functions as a heat insulating structure that suppresses heat transfer between the fans 22 and 23. For this reason, according to the air blower 2 of this embodiment, it becomes possible to suppress the heat transfer between the fans 22 and 23. In the present embodiment, the example in which the collar 233c is added to the second fan 23 side among the fans 22 and 23 has been described. However, the present invention is not limited thereto, and for example, a color is provided on the first fan 22 side. A color may be provided for both the fans 22 and 23.

(Other embodiments)
As mentioned above, although embodiment of this indication was described, this indication is not limited to the above-mentioned embodiment, and can change suitably. For example, various modifications are possible as follows.

  (1) In each above-mentioned embodiment, although the example which applies the air blower 2 of this indication to a vehicle air conditioner was explained, it is not limited to this. The air blower 2 is not limited to a moving body such as a vehicle, but may be applied to a stationary air conditioner used in a home or factory. Moreover, you may apply the air blower 2 not only to an air conditioner but to the temperature control apparatus of an apparatus, for example. In addition, when applying the air blower 2 to an air conditioner, the position of the air blower 20 is not located on the air flow downstream side of the temperature adjustment device such as the evaporator 13 or the heater core 14 but on the air flow upstream side of the temperature adjustment device. Also good.

  (2) In each of the above-described embodiments, the example in which the constituent elements of the fan made of the metal material are integrated by brazing and joining among the fans 22 and 23 has been described. May be integrally formed by welding.

  (3) In the above-described third embodiment, the example in which the single resonance circuit 53 is connected to the induction heating coils 51 and 52 has been described. However, the present invention is not limited to this. That is, a plurality of resonance circuits 53 may be provided corresponding to the induction heating coils 51 and 52, and the resonance circuits 53 may be individually connected to the induction heating coils 51 and 52. According to such a configuration, the supply amount of the alternating current to each induction heating coil 51, 52 can be individually adjusted, and the temperature of each fan 22, 23 can be finely adjusted individually.

  (4) Although it is desirable to arrange | position an induction heating coil in the position which adjoins a connection part rather than each blade | wing like each above-mentioned embodiment, it is not limited to this. For example, a part of the induction heating coil may be disposed at a position closer to each blade than the connecting portion.

  (5) Although it is desirable to house the induction heating coil in each groove formed in the connecting portion of the main plate as in the above-described embodiments, the present invention is not limited to this. The induction heating coil may be arranged at another position as long as it is a position close to the connecting portion of the main plate.

  (6) Although it is desirable to arrange induction heating on the opposite side of each blade in the connecting portion of the main plate as in the above embodiments, the present invention is not limited to this. The induction heating coil may be arranged at another position as long as it is a position close to the connecting portion of the main plate.

  (7) In each of the above-described embodiments, the example in which the blower 2 itself includes the resonance circuit 53 and the power supply circuit 54 has been described. However, the present invention is not limited thereto, and the induction heating coil is switched to AC from the power supply circuit or the like of another device. It is good also as a structure which supplies an electric current.

  (8) In each of the above-described embodiments, the example in which the single induction heating coil is disposed at a position close to the main plate has been described. For example, a plurality of induction heating coils may be arranged at positions close to the main plate.

  (9) Although it is desirable to heat at least one of the fans 22 and 23 by induction heating when the induction heating coil is energized as in each of the above-described embodiments, the present invention is not limited to this. For example, at least one of the fans 22 and 23 may be heated by radiant heat when energizing a nichrome wire or the like.

  (10) Although the blower device 2 including the two fans 22 and 23 has been described as in each of the above-described embodiments, the present invention is not limited thereto, and the blower device 2 may include three or more fans.

  (11) Although the example in which the fans 22 and 23 are configured as centrifugal fans has been described as in the above-described embodiments, the present invention is not limited thereto, and the fans 22 and 23 may be of other types (for example, crossflow fans). ).

  (12) In each of the above-described embodiments, the elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Needless to say. Moreover, the above-described embodiments can be appropriately combined within a possible range.

  (13) In each of the above-described embodiments, when a numerical value such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment is mentioned, it is clearly indicated that it is essential and a specific number clearly in principle. It is not limited to the specific number except when limited to.

  (14) In each of the above-described embodiments, when referring to the shape, positional relationship, material, etc. of the component, etc., the case where it is clearly specified and the case where it is limited to a specific shape, positional relationship, material, etc. in principle, etc. The shape, positional relationship, material, etc. are not limited.

Claims (5)

A blower case (21) constituting the outer shell;
A plurality of fans (22, 23) housed in the blower case and sucked in and blown out by rotating;
An electric motor (25) for rotationally driving the plurality of fans;
A heating device (50) for heating at least some of the plurality of fans;
A heat insulating structure (23, 223c, 233c) for suppressing heat transfer between the plurality of fans ,
The heating device is configured to heat a part of the plurality of fans (23),
Of the plurality of fans, the remaining fans (22) other than the some fans are made of a material having a lower thermal conductivity than the some fans,
The heat insulation structure is a blower configured by the remaining fans . The some of the fans are mainly composed of the metal material having a higher thermal conductivity than the remaining fans.
The blower according to claim 1 , wherein the remaining fans are mainly composed of a resin material having a lower thermal conductivity than that of the partial fans. The electric motor has a rotating shaft (252) connected to each of the plurality of fans and transmitting a rotational driving force to each of the plurality of fans,
The fan is connected to the rotating shaft via a connecting member (223c, 233c) made of a material having lower thermal conductivity than the rotating shaft,
The heat insulating structure, the air blowing device according to claim 1 or 2 is constituted by the connecting member. Applied to a vehicle air conditioner (1) for adjusting the indoor temperature of the vehicle,
A partition member (210) that is disposed between the plurality of fans and partitions the inside of the air blowing case into a plurality of air passages (215, 216) so that air blown out from the plurality of fans is divided. Prepared,
The plurality of air passages include a first air passage (215) that guides air to the upper space in the room, and a second air passage (216) that guides air to the lower space in the room,
The heating device, among the plurality of fans, according to any one of claims 1 and is configured to heat 3 fan for blowing air into said chamber via at least said second air passage Blower device. The heating device includes an induction heating coil (51, 52) that heats at least some of the plurality of fans by induction heating, and an AC supply unit (53, 54, 55) that supplies an alternating current to the induction heating coil. )
At least a portion of the fan of the plurality of fans, the AC when the AC current from a supply to the induction heating coil is supplied, according to to any one of the four preceding claims 1 is heated by induction heating Blower.

Images