JP2003139079A - Root type blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a root type blower effective in reducing the size and weight of a using device. SOLUTION: This root type blower 10 is provided with a blower part 37 for blowing air, and a motor part 38 having a stator part and a rotor part 26, and is characterized by integrally forming the rotor part 26 of the motor part 38 on a blower driving shaft 21 for rotatably driving two blower blades 15 and 16 of the blower part 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roots-type blower, and more particularly to a roots-type blower suitable for use as a fuel supply or a blower for a fuel cell.

[0002]

2. Description of the Related Art Conventionally, there is known a roots type blower in which two blower blades are rotated in a blower chamber to suck gas from a suction port of the blower chamber and discharge gas from a discharge port of the blower chamber to blow air. ing. The roots blower has a relatively simple structure, is solid, small and lightweight, and has an air volume and pressure range that cannot be obtained by other types of blowers such as a compressor and a turbo fan. For example, in a fuel cell that has been recently pursued to be miniaturized, a wind pressure of about 1.1 to 1.5 atm is required to supply oxygen and hydrogen, but the pressure is insufficient for a general turbofan. No, the wind pressure is too high with the compressor. On the other hand, the roots-type blower is effective in that it can easily meet the requirements for fuel supply and air blowing of the fuel cell in terms of size and wind pressure.

[0003]

Conventionally, these roots-type blowers are different from roots-type blowers via a coupling such as a belt and a gear in a state where a drive shaft for rotating blower blades is projected from a casing. It is driven by connecting to a separate electric motor. for that reason,
In use, it is necessary to connect the motor shaft and the drive shaft with a coupling. In addition, the device is complicated by the amount of coupling, requires maintenance, and is large in size, which greatly hinders the recent problems of downsizing and weight saving of fuel cells.

Therefore, the present invention has been made to solve these problems, and it is an object of the present invention to reduce the size and weight of the entire apparatus using the roots blower according to the present invention for blowing air or the like. It is to provide a roots-type blower capable of

[0005]

The present invention has the following constitution in order to achieve the above object. That is, the present invention is
A blower blade shaft and a blower drive shaft that are rotatably provided in parallel with a blower chamber provided with an intake port and a discharge port, and the blower blade shaft and the blower drive shaft rotate together, and their outer surfaces mesh with each other. A blower blade that rotates in a rotating manner, and a timing gear that is fixed to one end side of the blower blade shaft and one end side of the blower drive shaft and that is provided in mesh with each other. A roots-type blower in which a blower blade rotates to discharge the gas sucked into the blower chamber from the suction port from the discharge port,
A motor unit is provided that includes a rotor unit integrally provided on a shaft unit of the blower drive shaft extending to the other end side, and a stator unit that is rotatably fixed to a casing. It is characterized by This makes it possible to provide a roots-type blower that does not require coupling between the motor that is the drive source and the roots-type blower.

Further, the present invention is characterized in that the rotor portion and the stator portion are for direct current.

[0007]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a sectional view showing an embodiment of a roots blower according to the present invention, and FIG. 3 is an explanatory view showing the operation of a blower blade. 4 is a perspective view showing the shape of the blower blade, and FIG.
FIG. 4 is a perspective view showing the shape of a blower chamber formed by a blower case and a blower bracket.

As shown in FIG. 1, a roots type blower 10
Is a blower unit 37 that inhales and blows gas, and a blower unit 3
The motor unit 38 serves as a drive source of the drive unit 7. Blower part 37
The casing is a blower case 17 and a blower bracket 1
8 and a gear case 30, the interior of which is further defined by a blower bracket 18 into a gear chamber 12 and a blower chamber 13. One end sides of the blower blade shaft 20 and the blower drive shaft 21 penetrate the blower bracket 18 and extend from the blower chamber 13 to the gear chamber 12, and the other end side of the blower drive shaft 21 extends from the blower case 17 to the motor section 38. It is arranged so as to project.

The blower blade shaft 20 and the blower drive shaft 21
Are rotatably supported in parallel with each other by bearings 32, 32, 32, 32 fitted in bearing holes 31, 31, 31, 31 penetrating the blower case 17 and the blower bracket 18, respectively. The blower drive shaft 21 and the blower blade shaft 20 are provided with a blower blade 1 that can rotate integrally with these shafts in the blower chamber 13.
5 and 16 are provided, respectively.

As shown in the perspective view of FIG. 4, the blower blades 15 and 16 are formed in a Mayu-shaped cross section having a constant thickness. As shown in FIG. 3, the blower chamber 13 has an internal space formed into a Mayu-shaped cross section, and the suction port 33 and the discharge port 34 are located at positions facing each other in the central portion of the Mayu-shaped squeezed shape. It is provided so as to penetrate the side wall of the blower case 17. The blower blades 15 and 16 are in the blower chamber 13.
Inside, they are arranged so that they can be rotated with a slight gap, without being in direct contact with each other's outer peripheral side surfaces or the inner wall surface of the blower chamber 13, with their phases shifted by about 90 °.

Specifically, the blower case 17 has a Mayu-shaped recess 35 inside, and the blower blade 1 has a shape as shown in the perspective views of FIGS. 5 (a) and 5 (b).
The blower bracket 18 is fixed so that the blower brackets 18 and 15 are fitted and the lid is further covered to form the blower chamber 13. For the blower bracket 18, the bolt 19 has a screw hole 18
It is fixed to the blower case 17 by inserting and tightening a and 17a. Further, a seal member such as an O-ring may be sandwiched between the contact surfaces of the blower case 17 and the blower bracket 18 so as to maintain airtightness.

Further, the gear case 30 is fixed to the blower bracket 18 to form the gear chamber 12. As shown in FIG. 1, a pair of timing gears 22 and 23 meshing with each other are fixed to the tips of the blower blade shaft 20 and the blower drive shaft 21 located in the gear chamber 12, respectively. It is configured to transmit the driving force to the blower blade shaft 20.

Further, as shown in FIG. 1, a blower case 1
7, the outer surface of the motor bracket 38 in the direction of the motor portion 38 has
4 is fastened and fixed to the blower case 17 by screws 14. An inner rotor type motor for direct current is disposed between the motor bracket 24 and the blower case 17. Reference numeral 25 is a drive coil that is a stator portion, and is fixed between the blower case 17 and the motor bracket 24. The drive coil 25 has a motor iron core 27 in the center, a coil frame 29 is formed in a bobbin shape, and a motor winding 28 is wound around the coil frame 29. Further, the blower drive shaft 21 protruding between the drive coils 25
Is provided with a rotor portion 26 using this as a rotation axis. The rotor portion 26 is formed in a cylindrical shape having an outer peripheral portion made of a permanent magnet, and rotates integrally with the blower drive shaft 21 which is a rotation shaft.

Next, the operation of the roots blower 10 having such a structure will be described. First, the voltage of the DC power supply is applied to the drive coil 25, the rotor portion 26 rotates, and the blower drive shaft 21 rotates accordingly. Since the blower blade 15 is arranged on the blower drive shaft 21 and the timing gear 23 is arranged further ahead of it, the timing gear 23 rotates together with the blower blade 15. Then, the blower blade shaft 20 and the blower blade 16 rotate via the timing gear 22 that meshes with the timing gear 23.

Thus, the driving force of the motor section 38 is directly transmitted as the rotation of the blower blades 15 and 16 via the blower drive shaft 21 which is the output shaft of the motor. Blower blade 1
As shown in FIG. 3, the reference numerals 5 and 16 rotate 90 degrees out of phase with each other in the directions of arrows A and B which are opposite to each other. By this operation, air is drawn from the suction port 33 into the blower chamber 1
In addition to being sucked into the inside 3, the compressed air is discharged from the discharge port 34 to blow air.

FIG. 2 shows a roots type blower 11 when an AC motor is used as the motor section 40. Blower part 3
The configuration of 7 is similar to that of the embodiment of FIG.
Of the blower blade shaft 20 and the blower drive shaft 21 that are supported in parallel in the blower case 17, one blower drive shaft 21 extends in the direction of the motor unit 40. Also,
The motor bracket 24 is fastened and fixed to the blower case 17 with the screw 14 so as to fix the drive coil 41, which is the stator part, to the blower case 17. The drive coil 41 has a motor core 42 in the center.
The coil frame 43 is formed in a bobbin shape, and the motor winding 44 is wound around the coil frame 43. Further, the blower drive shaft 21 protruding between the drive coils 41 is provided with a rotor portion 39 with this as a rotation shaft. The rotor portion 39 is formed of a cage rotor having a portion made of silicon steel plate and the like, and a cage-shaped portion made of aluminum or the like covering the outer periphery thereof.

In the motor section 40 having the above structure,
When an AC power source is connected and a voltage is applied, the rotor section 39,
The blower drive shaft 21 rotates. And timing gear 2
The blower blades 15 and 16 are simultaneously rotated through the blades 2 and 23. Air is blown from the blower chamber 13 by rotating the blower blades 15 and 16, as in the above-described embodiment.

The shape of the motor section is not limited to the above, and various modifications such as changing the shapes of the rotor section and the stator section are possible. For example, as shown in FIG. 6, the motor unit 45 may be an outer rotor type. The roots type blower 51 comprises a motor unit 45 and a blower unit 37, and the structure of the blower unit 37 is the same as that of the above-described embodiment.

This is because the blower drive shaft 21 has the motor unit 4
The blower case 17 is extended in five directions, and the blower case 17 is also extended in a portion surrounding a bearing 32 that supports the blower drive shaft 21. Then, the motor iron core 47 is fitted to the extended portion, fixed by the bolt 50, and the motor winding 48 is further wound to form the drive coil 49. A rotor portion 46 that surrounds the drive coil 49 from the outside is fixed to the tip of the extended blower drive shaft 21 with a gap from the drive coil 49. In this way, the outer rotor type motor unit 4
Even if 5, the blower blades 15 and 16 can be rotated by the blower drive shaft 21 to blow air as described above.

The shape of the blower blade is also a cross-section Mayu type, but the shape is not limited to this, and a three-leaf type or a male and female screw type is also conceivable. In any case, it is possible to reduce the size and weight by integrating the roots type blower and the motor with the rotation axis of the motor and the drive axis of the blower blade as the same axis. Furthermore, when this roots blower is used in a device such as a fuel cell, it can be made to match the wind pressure required for fuel supply, and it is more effective in reducing the size and weight of the entire device as compared with the prior art. Further, since the coupling with the motor is unnecessary, it is inexpensive and maintenance such as maintenance of the coupling is unnecessary.

[0021]

In the roots type blower according to the present invention, the blower drive shaft and the motor drive shaft are integrally formed,
It is possible to reduce the size and weight of the entire device in which the roots blower is incorporated. Further, since it has a simple structure, it can be provided at a low cost, and since it does not require replacement or maintenance of the coupling, it is easy to use.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a roots blower according to the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the roots blower according to the present invention.

FIG. 3 is an explanatory view showing the operation of a blower blade.

FIG. 4 is a perspective view showing the shape of a blower blade.

FIG. 5 is a perspective view showing a configuration of a blower chamber.

FIG. 6 is a sectional view showing another embodiment of a roots blower according to the present invention.

[Explanation of symbols]

10, 11, 51 Roots blower 12 gear chamber 13 Blower room 14 screws 15, 16 Blower blade 17 Blower case 18 Blower bracket 19,50 volt 20 Blower blade axis 21 Blower drive shaft 22, 23 Timing gear 24 motor bracket 25, 41, 49 Drive coil 26, 39, 46 Rotor part 27, 42, 47 Motor core 28, 44, 48 Motor winding 29, 43 coil frame 30 gear case 31 Bearing hole 32 bearings 33 Inhalation port 34 outlet 35 recess 37 Blower part 38, 40, 45 Motor part

Claims (2)

[Claims] 1. A blower blade shaft and a blower drive shaft that are rotatably provided in parallel with a blower chamber provided with an intake port and a discharge port, and the blower blade shaft and the blower drive shaft rotate integrally with each other, and The blower blades whose side surfaces are in mesh with each other and rotate, and the blower blade shaft and a timing gear fixed to one end side of the blower drive shaft, respectively, which are provided in mesh with each other, the blower drive shaft being rotationally driven. In the roots type blower, the blower blade is rotated to discharge the gas sucked into the blower chamber from the suction port from the discharge port, and the blower drive shaft extends to the other end side. A roots-type blower comprising: a motor unit including a rotor unit that is integrally provided to the unit; and a stator unit that is rotatably fixed to a casing. 2. The roots type blower according to claim 1, wherein the rotor portion and the stator portion are for direct current.