JPH0933125A - Turbine compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbine compressor to prevent reduction of the suction efficiency of air, prevent mixture of lubrication oil in air, to shorten length in an axial direction, reduce a volume, and improve facility. SOLUTION: A motor M and a booster 9 are arranged between a compressor impeller 4 and a turbine impeller 7. By boosting rotation of a rotor 28 of the motor M by the booster 9, the rotation is transmitted to a shaft S and the compressor impeller 4 and the turbine impeller 7 are rotated at a high speed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an improvement of a turbine compressor used in an air refrigeration cycle or the like.

[0002]

2. Description of the Related Art Generally, an air refrigeration cycle is used for cooling indoor air without using a refrigerant or the like, and its circuit is, as shown in FIG. 4, an indoor 1 and a turbine compressor 2. Of the turbine compressor 2 is adiabatically compressed by the compressor impeller 4 of the turbine compressor 2 into high-temperature and high-pressure air, which is then introduced into the radiator 5 where it is blown by the fan 6. Cool with cooling air to obtain medium-temperature high-pressure air. The turbine impeller 7 of the turbine compressor 2 adiabatically expands the air into low-temperature and low-pressure air, and then returns the air to the room 1 through the duct D to cool the room 1.

A conventional turbine compressor 2 used in such an air refrigeration cycle is a turbine impeller 7
And the compressor wheel 4 are connected by a common shaft S, and the shaft S is provided with a bearing J, which is provided in the casing 8.
Although supported by J, the shaft S is further inserted through the inside of the inlet passage 3 and extended outward in the axial direction, and is connected to the motor M via the gearbox 9.

When air is compressed using such a turbine compressor 2, it is necessary to rotate the compressor wheel 4 at an extremely high speed of approximately 100,000 rpm or more, so the rotation of the motor M is increased. The machine 9 increases the speed by several ten times and transmits it to the shaft S to rotate the compressor impeller 4 and the turbine impeller 7.

The speed increaser 9 has a shaft S of the motor M.
A ring gear 10 which is an internal gear connected to m, a plurality of star gears 11 provided so as to mesh with each other inward in the radial direction of the ring gear 10, and these star gears 11
The sun gear 12 is provided so as to be rotated by the sun gear 12, and the sun gear 12 rotates the shaft S.

[0006]

However, in the turbine compressor 2 used in such an air refrigeration cycle, the shaft S extends through the inlet passage 3, so that the shaft S is It becomes a hindrance to the air flow flowing in the passage 3 and reduces the air intake efficiency,
For the turbine compressor 2 which has to process a large amount of air, it is a major cause of a reduction in air cooling capacity.

The shaft S connects the compressor wheel 4 and the turbine wheel 7, extends through the inside of the inlet passage 3 to the outside, and is connected in series with the motor M and the gearbox 9. Therefore, the length of the turbine compressor 2 in the axial direction is long, the entire device becomes large, and a small cooling device such as an automobile is not used for a preferable one, and has a high-power engine such as an aircraft. The reality is that it is only used in devices.

Incidentally, Japanese Utility Model Laid-Open No. 6-31,378 discloses a brake device for rotating a turbocharger using exhaust gas of an engine, in which a rotary electric machine is provided between both turbochargers. However, in this device, since it is not necessary to accelerate the turbocharger, there is no speed increaser.

Further, the inlet passage 3 through which the shaft S is inserted is a portion where the pressure state of air is low, and when the shaft S is provided in such a low pressure region, the compressor impeller 4 side in the high pressure state or the increased pressure state. There is also a structural problem that the lubricating oil flows from the side of the speed reducer 9 into the low pressure inlet passage 3, and the lubricating oil mixes into the intake air flowing therethrough.

The present invention has been made in view of the above problems, and there is no reduction in air cooling capacity due to the shaft, no lubricating oil is mixed into the intake air, and the axial length is short. An object of the present invention is to provide a compact turbine compressor that can be used for a small engine such as an automobile.

[0011]

In order to achieve the above object, the invention according to claim 1 has a compressor impeller for adiabatically compressing gas at one end and adiabatic expansion for high pressure gas at the other end. In a turbine compressor in which a shaft having an impeller is driven by a motor via a gearbox, the rotor of the motor is attached to the outer circumference of the shaft between the compressor impeller and the turbine impeller, A stator is arranged around the child, and a speed increaser that speeds up the rotation of the rotor and transmits the speed to the shaft is provided between the compressor impeller and the turbine impeller.
A speed increaser according to a second aspect of the present invention has a hollow shaft provided between the shaft and the shaft via a bearing, and while the rotor of the motor is mounted on the outer periphery of the hollow shaft, The motor is configured by providing a stator with a gap between the child and the small gear, and a ring gear of an internal gear rotated by the hollow shaft is provided at an end portion of the rotor to rotate the ring gear. It is characterized in that it is transmitted to a sun gear attached to the shaft through a plurality of star gears. The invention according to claim 3 is characterized in that the compressor impeller and the turbine impeller are incorporated in an air cooling cycle.

[0012]

According to the invention as set forth in claim 1 having such a structure, since the motor and the speed increasing gear are mounted between the compressor impeller and the turbine impeller, the shaft is inserted through the inlet duct. The air is not stretched, the intake air flows smoothly in the duct on the inlet side, and there is no reduction in the air cooling capacity due to the shaft. Moreover, if a motor and a gearbox are provided between the two vanes, the axial length of the turbine compressor is inevitably shortened, which makes it compact and easy to use even for small engines such as automobiles. . Furthermore, since the gearbox and the shaft bearing are located between the compressor impeller and the turbine impeller, where high-pressure air flows, lubricating oil does not flow through the shaft to the inlet passage. ,As a result,
A situation in which lubricating oil is mixed into the intake air is prevented. According to a second aspect of the present invention, the gearbox is configured by providing a star gear and a sun gear in a ring gear of a flat internal gear, and the gearbox is provided between a compressor impeller and a turbine impeller. The shaft length of the turbine compressor is further shortened and the volume is reduced. According to the invention described in claim 3, if the turbine compressor is incorporated into an air cooling cycle and is used to compress and circulate air, a vehicle air conditioner that does not use a refrigerant can be provided.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a schematic cross-sectional view of a main part according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view showing a step-up gear part of FIG. 1, and FIG. The same members as those shown in FIG. 4 are designated by the same reference numerals.

The turbine compressor 20 according to this embodiment is incorporated in an air refrigeration cycle. In the air refrigeration cycle, the interior 1 and the inlet passage 3 of the turbine compressor 20 are connected by a duct D, and a compressor impeller 4 is used.
After adiabatically compressing the air with high temperature and high pressure air,
After being introduced into the radiator 5, the cooling air blown from the fan 6 produces medium-temperature high-pressure air, which is adiabatically expanded by the turbine impeller 7 to produce low-temperature low-pressure air, which is then introduced into the room 1 by the duct D. The room 1 is cooled down.

The casing 21 of the turbine compressor 20 has a compression chamber 22 in which the compressor wheel 4 is provided on the right end side, and a turbine wheel 7 on the left end side.
A drive chamber 24 is provided between the compression chamber 22 and the expansion chamber 23, and a motor M is provided in the drive chamber 24.

Side walls 25 and 26 are provided between the drive chamber 24 and the compression chamber 22 and the expansion chamber 23, respectively.
The side walls 25, 26 support the shaft S via bearings J, J.

The shaft S connects the compressor wheel 4 and the turbine wheel 7, and a hollow shaft 27 is attached to the outer periphery of the shaft S via a bearing J. The rotor 28 of the motor M is fixed to the outer circumference. Around the rotor 28, a small gap G
A stator 29 attached to the inner peripheral surface of the drive chamber 24 is provided oppositely via.

Between the end of the hollow shaft 27 and the side wall 26, there is provided a speed increasing gear 9 as shown in detail in FIGS. This speed increaser 9 has a disk-shaped boss portion 30 that projects outward in the radial direction from the end of the hollow shaft 27. The disk-shaped boss portion 30 is integrally formed with a ring gear 10 that is an internal gear. Installed in place. A plurality of star gears 11 rotatably provided on the side wall 26 by a shaft 11a mesh with each other inwardly of the ring gear 10, and these star gears 11 are integrally formed with the shaft S. The provided sun gear 12 meshes with the sun gear 12 so that the shaft S is rotated.

In other words, by providing the star gear 11 and the sun gear 12 in the flat gear of the ring gear 10 to form the overall flat gearbox 9, there is little problem even if the shaft S is rotated at a very high speed. In addition, it is possible to output a high-speed rotation of 100,000 rpm or more, which cannot be obtained by rotating only the motor M, and only the rotation of the motor M compresses air in the compression chamber 22 on the compressor impeller 4 side. On the turbine impeller 7 side, high-speed rotation that adiabatically expands air in the expansion chamber 23 is possible.

In particular, such high speed rotation is possible mainly because the axial length of the shaft S is shorter than that of the conventional gearbox. Generally, when the shaft S is rotated at a high speed, the shaft S itself rotates and causes flexural vibration. However, if the axial length of the shaft S is short, this resonance point can be further increased, and the number of rotations can be raised. Can be a safer device. Therefore, like the turbine compressor 20, the shaft S
With a shorter axial length, it will be a safe device even if it is rotated at a considerably high speed, so in some cases a compact and easy-to-use turbine that can be used even for small engines such as automobiles. It can be a compressor.

Next, the operation will be described. When the air conditioner switch is turned on, the rotor 28 rotates inside the stator 29.
This rotation is transmitted to the gearbox 9 via the hollow shaft 27,
The shaft S is rotated at an extremely high speed of about 100,000 rpm. That is, the rotation of the hollow shaft 27 causes the disc-shaped boss portion 3 to rotate.
0, the ring gear 10, and the star gear 11 are transmitted to the sun gear 12, and the shaft S rotates at an extremely high speed.

Since the compressor impeller 4 and the turbine impeller 7 are connected to the shaft S, both impellers 4 and 7 also rotate at high speed, and the air in the room 1 is passed through the duct D on the compressor impeller 4 side. Is sucked into the compression chamber 22, where it is adiabatically compressed to form high-temperature and high-pressure air, which is discharged from the outlet toward the radiator 5.

Here, in this embodiment, since the motor M and the speed increasing gear 9 are mounted between the compressor impeller 4 and the turbine impeller 7, the air resistance such as the shaft S in the inlet passage 3 is increased. The air smoothly flows through the inlet passage 3. Therefore, even if a large amount of air is introduced into the radiator 5 from the compression chamber 22 through the duct D, there is no fear that the air suction efficiency will decrease.

Moreover, the fact that the motor M and the speed increasing gear 9 are provided between the two impellers 4 and 7 unnecessarily results in the shaft S.
Does not become long and the axial length of the turbine compressor 20 becomes short, so that not only the volume is small and it is convenient to use, but also the resonance point of the flexural vibration of the shaft S when rotating at high speed is high. It becomes a safer device.

The air guided to the radiator 5 is
Heat is exchanged with the cooling air from the fan 6, and the high-temperature and high-pressure air is cooled to be medium-temperature and high-pressure air.

The medium-temperature and high-pressure air is sucked into the expansion chamber 23 through the duct D, adiabatically expanded therein, and becomes low-temperature and low-pressure air, which is guided to the room 1 by the duct D and cools the room 1. To be done.

Further, in the present embodiment, the gearbox 9 and the shaft bearing portion J are present between the compressor impeller 4 and the turbine impeller 7 through which high-pressure air flows, so that the shaft S and the like are transmitted. Therefore, there is no possibility that the lubricating oil will flow toward the inlet passage 3, and the situation that the lubricating oil is mixed in the air is prevented.

The present invention is not limited to the above embodiment, but can be variously modified within the scope of the claims. For example, in the above-described embodiment, air is compressed, but it is also possible to pressurize and circulate various gases in addition to this, and the turbine compressor can be used for the automobile air conditioner. Not only can it be used for an air cooling cycle, but it can also be used for cooling an airplane, a railway vehicle, a house, or the like.

The gearbox of the above embodiment is a ring gear,
The present invention is not limited to such a flat gear made of a star gear or the like, but may be any other provided as long as it is provided between the compressor impeller 4 and the turbine impeller 7. It may be something like this. In addition,
The number of the star gears is not limited to two as shown in the figure, and a larger number may be provided.

[0030]

As described above, according to the first aspect of the present invention, since the motor and the gearbox are mounted between the compressor impeller and the turbine impeller, the shaft is inserted through the inlet duct. Air flows smoothly in the duct on the inlet side, there is no risk of reducing the air intake efficiency due to the shaft, the axial length is shortened, the volume is small, and it is easy to use. It will be good. Further, since the speed increaser and the shaft bearing portion are present between the compressor impeller and the turbine impeller, which are high pressure air flowing parts, there is no risk that lubricating oil is mixed in the air.
According to a second aspect of the present invention, the gearbox is configured by providing a star gear and a sun gear in a flat ring gear,
Since the gearbox is attached to the shaft between the compressor wheel and the turbine wheel, the axial length of the turbine compressor is further shortened and the volume is also reduced. According to the third aspect of the invention, since the turbine compressor is incorporated in the air cooling cycle and used, air conditioning for the vehicle can be performed without using a refrigerant.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional explanatory view of essential parts according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a gearbox portion of FIG.

FIG. 3 is a cross-sectional view taken along the line 3-3 of FIG.

FIG. 4 is a schematic cross-sectional view of a main part of a conventional turbine compressor.

[Explanation of symbols]

1 ... indoor, 4 ... compressor impeller, 5
... radiator, 7 ... turbine impeller, 9 ... gearbox, 10 ... ring gear, 11 ... star gear, 12 ... sun gear, 27 ... hollow shaft,
28 ... Rotor, 29 ... Stator, J ... Bearing,
M ... Motor, S ... Shaft.

Claims (3)

[Claims] 1. A shaft (S) having a compressor wheel (4) for adiabatically compressing gas at one end and a turbine wheel (7) for adiabatically expanding high-pressure gas at the other end, and a shaft (S) having a gearbox (9). ) Via a motor (M), the rotation of the motor (M) on the outer circumference of the shaft (S) between the compressor wheel (4) and the turbine wheel (7). A child gear (28) is attached, a stator (29) is arranged around the rotor (28), and a speed increaser that accelerates the rotation of the rotor (28) and transmits the rotation to the shaft (S) ( A turbine compressor, characterized in that 9) is provided between the compressor impeller (4) and the turbine impeller (7). 2. The speed increaser (9) has a hollow shaft (27) provided between the shaft (S) and a bearing (J),
By mounting the rotor (28) of the motor (M) on the outer circumference of the hollow shaft (27), and by providing the stator (29) with a small gap (G) between the rotor (28) and the rotor (28). The motor (M) is configured, and a ring gear (10) of an internal gear rotated by the hollow shaft (27) is provided at an end of the rotor (28), and the ring gear is provided.
The turbine compressor according to claim 1, wherein the rotation of (10) is transmitted to a sun gear (12) attached to the shaft (S) via a plurality of star gears (11). 3. Turbine compressor according to claim 1 or 2, characterized in that the compressor wheel (4) and the turbine wheel (7) are incorporated in an air cooling cycle.