JP2000002192A - Compressor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor device to discharge a compressed air, in which a lubricating oil for bearings is precluded from inclusion in the compressed air. SOLUTION: An impeller 2 is coupled with a rotary shaft 1 rotated by the exhaust gas or a motor, or by both of them, and a compressed air intake pipe line 22a is provided to tie a pressurizing volute 15 where a compressed air pressurized by the centrifugal force of the impeller 2 exists, with a bushing 6 on the rotary shaft 1, wherein the compressed air is taken in from an intake port 12 of the intake pipe line 22a left open to the volute 15. In this compressor device, the compressed air taken in and jetted out of a jet 13 against the bushing 6 blows off the lubricating oil going to pass through the gap 24 between the bushing 6 and a back plate 16 to cause the oil to be exhausted from an outlet port 5 via an exhaust pipe line 22b, and the compressed air discharged from the compressor is precluded from inclusion of the lubricating oil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor device, and more particularly to a compressor device in which lubricating oil is not mixed into compressed air.

[0002]

2. Description of the Related Art As a conventional technique, for example,
No. 22047 discloses this. This prior art relates to a control device for a turbocharger of an internal combustion engine, and represents a conventional centrifugal compressor device.

[0003]

The above prior art cannot be used because lubricating oil is mixed in the compressed air, and particularly when used in a fuel cell, the performance is adversely affected.

FIG. 4 is a cross-sectional view of a compressor section 21 of a turbocharger which is the above-mentioned conventional compressor device. The compressor section 21 includes a rotating shaft 1, an impeller 2, bearings 4a and 4b, a bush 6, a housing 9, a back plate 16, and the like.

The housing 9 has an inlet 10 and an outlet 1.
1 is attached, housing 9 and back plate 16
Pressurized volute 15 is formed.

[0006] The impeller 2 is rotated by the rotating shaft 1, and the air sucked in from the intake port 10 is pressurized by the centrifugal force of the impeller 2 and discharged from the discharge port 11 through the pressurized volute 15. The rotating shaft 1 is held by bearings 4a and 4b, and a lubricating oil inlet 3 is provided to lubricate the bearings 4a and 4b.
And the lubricating oil is discharged from the lubricating oil outlet 5. At the time of low rotation such as when the compressor device is started, the back space 23 of the impeller 2 becomes negative pressure, so that the lubricating oil of the bearing 4b is sucked into the back space 23 of the impeller 2 through the gap 24 between the bush 6 and the back plate 16. However, there is a problem in that it is mixed into the compressed air. The oil mist having a relatively large particle diameter is repelled by a bush 6 rotating together with the rotating shaft 1, then received by a baffle 7, and discharged from a lubricating oil outlet 5. However, the oil mist having a small particle diameter passes through the gap 24 between the bush 6 and the back plate 16 and is further sucked into the back space 23 of the impeller 2 by the negative pressure. The seal ring 8 prevents most of it, but a part is mixed with the compressed air and discharged from the discharge port 11.

In the case of an internal combustion engine, mixing of this lubricating oil is not a problem, but is a problem in the case of a compressor device for feeding air to a fuel cell.

If the components of the lubricating oil include substances that poison the electrode catalyst of the fuel cell, the performance of the fuel cell may be significantly reduced.

[0009] Even if no poisoning substance is contained, the lubricating oil adheres to the electrode surface of the fuel cell, hinders the reaction of the electrode and lowers the performance.

The present invention solves the above-mentioned problems and provides a compressor device having a structure in which lubricating oil is not mixed into compressed air.

[0011]

Means for Solving the Problems In order to solve the above technical problems, the technical means (hereinafter referred to as first technical means) taken in claim 1 of the present invention is an exhaust gas, an electric motor, or an electric motor. A pressurized volute in which there is compressed air pressurized by centrifugal force of an impeller coupled to a rotating shaft that rotates with both of them as power, a bush provided on the rotating shaft, and the bush provided on the rotating shaft via the bush A compressor device comprising a back plate for supporting, and a compressed air intake pipe connecting between the pressurized volute and the bush.

The effects of the first technical means are as follows.

That is, the compressed air of the pressurized volute is blown to the bush through a compressed air intake pipe connecting between the pressurized volute and the bush of the rotating shaft, and lubricating oil which tries to pass through a gap between the bush and the back plate is removed. The discharge from the lubricating oil outlet has an effect of preventing lubricating oil from being mixed into the compressed air.

The technical measures taken in claim 2 of the present invention (hereinafter referred to as second technical means) are provided on a compressed air intake pipe connecting between the pressurized volute and the bush of the rotary shaft. 2. An on-off valve is provided.
It is a compressor apparatus of a statement.

The effects of the second technical means are as follows.

When the number of rotations of the compressor device is 100,000 or more, the space behind the impeller also becomes high pressure, so that there is no danger of lubricating oil being mixed.

At this time, taking in compressed air and blowing it on the bush also results in loss of compressed air and energy.

Therefore, by closing the on-off valve at the time of high rotation, the intake of the compressed air is stopped and the loss of the compressed air and energy of the compressor device can be suppressed.

The technical means adopted in claim 3 of the present invention (hereinafter, referred to as third technical means) is that the compressor device is provided with a combustion exhaust gas obtained by burning unused hydrogen from a stack, an electric exhaust gas, or an electric motor. The compressor device according to claim 1, wherein the compressor device is a fuel cell compressor device that compresses air and supplies the compressed air to the stack using both of them as power.

The effects of the third technical means are as follows.

That is, lubricating oil is mixed into the air supplied to the fuel cell stack and adheres to the electrode surface of the fuel cell, thereby preventing the reaction of the electrode and preventing the performance of the fuel cell from deteriorating. .

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a fuel cell system for an automobile.

The present system includes a methanol reformer 25, a solid polymer electrolyte fuel cell stack 60, a turbo assist compressor device 17, and the like.

The turbo assist compressor device 17
It comprises a burner 19, a motor 18, a turbine 20 and a compressor section 21.

The motor 18, the turbine 20, and the compressor section 21 are connected by a common rotary shaft 1.

The air filter 30 and the intake port 10 of the compressor section 21 are connected by a first pipe 31.

The outlet 11 of the compressor section 21 and the air inlet 41 of the stack 60 are connected by a second pipe 32.

The air outlet 43 of the stack 60 and the burner 1
Nine intake ports 51 are connected by a third pipe 33.

The methanol reformer 25 converts fuel, methanol and water, into a reformed gas containing hydrogen as a main component. The reformed gas outlet 40 of the methanol reformer 25 and the fuel-side inlet 42 of the stack 60 are connected by a fourth pipe 34.

The fuel outlet 44 of the stack 60 and the burner 1
Nine fuel inlets 52 are connected by a fifth pipe 35.

The exhaust gas outlet 53 of the burner 19 and the turbine inlet 54 of the turbine 20 are connected by a sixth pipe 36.

The stack 60 generates power by an electrochemical reaction using the reformed gas sent through the fourth pipe 34 and the air sent from the compressor section 21 of the turbo assist compressor device 17 through the second pipe 32. .

In the stack 60, the hydrogen in the reformed gas is 1
00% is not used, and the usage rate is about 80%. The unused hydrogen that has not been used is sent to the burner 19 through the fifth pipe 35, and the unused air sent to the burner 19 through the third pipe 33 is used as a combustion assisting agent. The used hydrogen is burned by the burner 19.

The exhaust gas from the burner 19 is supplied from the exhaust gas outlet 53 through the sixth pipe 36 to the turbine 20 from the turbine inlet 54 to rotate the turbine 20.

The rotating shaft 1 of the compressor section 21 is rotated by the rotation of the turbine 20 and / or the motor 18 to rotate the compressor section 21.

When the compressor section 21 rotates, external air passes through the air filter 30 and the first pipe 31.
Then, the air is sucked into the intake port 10 of the compressor section 21, compressed, discharged from the discharge port 11, and sent to the air inlet 41 of the stack 60 through the second pipe 32.

FIG. 2 shows a compressor unit 2 of a compressor device according to an embodiment of the present invention (hereinafter, referred to as a first embodiment).
1 is a sectional view of FIG.

The compressor section 21 includes a rotating shaft 1, an impeller 2, bearings 4a and 4b, a bush 6, a housing 9, a back plate 16, and a compressed air intake pipe 22a for compressed air.

The housing 9 has an inlet 10 and an outlet 1
1 is attached, housing 9 and back plate 16
Pressurized volute 15 is formed.

The pressurized volute 1 is placed in the back plate 16.
An L-shaped compressed air intake pipe 22a is provided which connects between the groove 5 and the groove 29 provided in the bush 6 of the rotary shaft 1.

The bush 6 has a cylindrical shape on the concentric axis of the rotary shaft 1, and has a groove 29 engraved on the outer periphery thereof. Further, a discharge conduit 22b is provided to connect between the groove 29 and the lubricating oil outlet 5.

The compressed air inlet 12 which is one end of the compressed air intake pipe 22a is opened to the pressurized volute 15 and the compressed air outlet 13 which is the other end is connected to a groove 29 provided in the bush 6. It is open.

When the impeller 2 rotates, the air sucked from the intake port 10 is pressurized by the centrifugal force of the impeller 2 and is discharged from the discharge port 11 through the pressurized volute 15.
The rotating shaft 1 is held by bearings 4a and 4b, and a lubricating oil inlet 3 is provided to lubricate the bearings 4a and 4b.
And the lubricating oil is discharged from the lubricating oil outlet 5. Compressed air pressurized by the centrifugal force of the impeller 2 is taken in from the compressed air inlet 12 of the compressed air intake pipe 22a, and this compressed air passes through the compressed air intake pipe 22a from the compressed air jet port 13 to the bush 6. Is sprayed on the groove 29.

At the time of low rotation such as when the compressor device is started, the back space 23 of the impeller 2 becomes negative pressure,
The lubricating oil of the bearing 4b, which is about to be sucked into the back space 23 of the impeller 2 through the gap 24 between the bush 6 and the back plate 16, is supplied to the bush 6 by the compressed air of the pressurized volute 15 passing through the compressed air intake pipe 22a. It is blown off through the groove 29 provided and discharged from the lubricating oil outlet 5 at the lower part.

Thus, it is possible to prevent the lubricating oil from being sucked into the back space 23 of the impeller 2 and mixed into the compressed air.

Although the bush 6 is not provided with a seal ring in this embodiment, the seal ring may be provided simultaneously with the provision of the groove 29.

FIG. 3 shows another embodiment of the present invention (hereinafter referred to as a second embodiment).
FIG. 4 is a cross-sectional view of a compressor unit 21 of the compressor device of the present embodiment.

The compressor section 21 includes a rotating shaft 1, an impeller 2, bearings 4a and 4b, a bush 6, a housing 9, a back plate 16, a compressed air intake pipe 122c for compressed air, and an opening / closing port provided in the pipe 122c. Valve 14
It is composed of

The housing 9 has an inlet 10 and an outlet 1
1 is attached, housing 9 and back plate 16
Pressurized volute 15 is formed.

A compressed air intake conduit 122c is provided which exits from the upper convex portion 15a of the pressurizing volute 15 and passes through the upper portion 16a of the back plate 16 and connects the groove 29 provided in the bush 6 of the rotary shaft 1. The discharge line 12 that connects between the groove 29 provided in the back plate 16 and the lubricating oil outlet 5
2b is provided.

A compressed air inlet 112, which is one end of the compressed air intake pipe 122c, is open to the pressurized volute 15 and a compressed air outlet 113, which is the other end, is formed in a groove 29 provided in the bush 6. It is open.

An open / close valve 14 is provided in the middle of a compressed air intake line 122c connecting the upper convex portion 15a of the pressurized volute 15 of the compressed air intake line 122c and the upper portion 16a of the back plate 16.

When the impeller 2 rotates, the air sucked from the intake port 10 is pressurized by the centrifugal force of the impeller 2 and is discharged from the discharge port 11 through the pressurized volute 15.
The rotating shaft 1 is held by bearings 4a and 4b, and a lubricating oil inlet 3 is provided to lubricate the bearings 4a and 4b.
And the lubricating oil is discharged from the lubricating oil outlet 5. The opening / closing valve 14 is opened during low rotation, such as when the compressor device is activated, in which the back space 23 of the impeller 2 becomes negative pressure, and the compressed air pressurized by the centrifugal force of the impeller 2 compresses the compressed air in the compressed air intake pipe 122c. The compressed air is taken in from the intake port 112 and is blown from the compressed air jet port 13 into the groove 29 of the bush 6 through the compressed air intake pipe 122c.

As a result, the lubricating oil of the bearing 4b, which is to be sucked into the back space 23 of the impeller 2 through the gap 24 between the bush 6 and the back plate 16, is blown off by the groove 29 provided in the bush 6 and the lubricating oil at the lower part Exit 5
And lubricating oil is prevented from being sucked into the back space 23 of the impeller 2 and mixed with the compressed air.

When the back space 23 of the impeller 2 is at a high pressure and the lubricating oil does not mix with the compressed air at a high rotation speed, the on-off valve 14 is closed to stop the intake of the compressed air into the compressed air intake line 122c. This can prevent loss of compressed air and energy.

In this embodiment, the bush 6 is not provided with a seal ring. However, the seal ring may be provided simultaneously with the provision of the groove 29.

In the embodiment shown in FIGS. 2 and 3, the compressed air intake pipes 22 a and 122 c show an example in which the passages are provided in the back plate 16. Instead, it is also possible to adopt a configuration in which the outer periphery of the bush 6 is directly communicated with a pipe or the like.

[0059]

As described above, the present invention relates to a pressurized volute in which compressed air pressurized by centrifugal force of an impeller connected to a rotating shaft rotated by exhaust gas and / or electric power is used. A bush provided on the rotating shaft;
The compressor device comprises a back plate that supports the rotating shaft via the bush, and a compressed air intake line that connects the pressurizing volute and the bush is provided. The compressed air of the volute is blown to the bush through a compressed air intake pipe connecting between the pressurized volute and the bush of the rotating shaft, and blows off the lubricating oil that tries to pass through the gap between the bush and the back plate, and discharges it from the lubricating oil outlet. This can prevent the lubricating oil from being mixed into the compressed air.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a fuel cell system for an automobile.

FIG. 2 is a sectional view of a compressor section according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a compressor section according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional compressor unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotating shaft 2 ... Impeller 3 ... Lubricating oil inlet 4a, 4b ... Bearing 5 ... Lubricating oil outlet 6 ... Bush 7 ... Baffle 8 ... Seal ring 9 ... Housing 10 ... Intake port 11 ... Discharge port 12, 112 ... Compressed air intake Inlet 13, 113 Compressed air outlet 14 On-off valve 15 Pressurized volute 16 Back plate 17 Turbo assist compressor device 18 Motor 19 Burner 20 Turbine 21 Compressor section 22a, 122c Compressed air intake line 22b, 122b discharge line 23 back space 24 gap 25 methanol reformer 30 air filter 31 first pipe 32 second pipe 33 third pipe 34 fourth pipe 35 fifth pipe 36 ... Sixth piping 40 ... Reformed gas outlet 41 ... Air side inlet 42 ... Air side outlet 43 ... Fuel side inlet 44 ... Fuel side outlet 51 ... intake port 52 ... fuel inlet 53 ... exhaust gas outlet 54 ... turbine inlet 60 ... stack

Claims (3)

[Claims] 1. A pressurized volute in which compressed air pressurized by centrifugal force of an impeller coupled to a rotating shaft rotated by exhaust gas or electric power or both is used as a power, and a bush provided on the rotating shaft; A compressor device, comprising: a back plate that supports the rotating shaft via the bush; and a compressed air intake conduit that connects the pressurized volute and the bush. 2. The compressor device according to claim 1, wherein an on-off valve is provided on a compressed air intake pipe connecting between the pressurized volute and the bush of the rotary shaft. 3. The fuel cell compressor device according to claim 1, wherein the compressor device is a fuel cell compressor device that compresses air and supplies the compressed air to the stack by using flue gas obtained by burning unused hydrogen from the stack and / or electric power. The compressor device according to claim 1, wherein: