JPH11182486A - Compressed air generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressed air generating device which can prevent occurrence of a surge phenomenon, reduce the running cost, and suppress the costs for fabrication. SOLUTION: A plurality of thin air ducts 33 are provided which are easy to fabricate, and the air compression process in each air duct 33 is made uniform and stable by utilizing acceleration owing to the centrifugal force generated in the air duct 33, which should prevent occurrence of a surge phenomenon, reduce the running cost through omission of any exhausting material such as oil, and suppress the costs for fabrication because of simplified structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed air generator in which an impeller is rotated in a casing so that air taken into the center of rotation of the impeller is taken out from the outer periphery of the impeller as compressed air. About.

[0002]

2. Description of the Related Art In the current manufacturing industry, a compressed air power source is one of the precious power sources because it requires little after-treatment. Compressed air is used for a wide variety of purposes, including blowing, blowing, expanding, crushing, and cooling.

In order to produce compressed air, a great deal of electric power is consumed. Therefore, if a slight increase in efficiency is achieved, the energy saving is enormous.

Conventionally, gas compression methods include a capacity compression method and a turbo method. In the case of the capacity compression system, the reciprocating type and the screw type are mainly used. In the capacity compression method, as shown in the letters, compressed air is obtained by tightening a closed space, and is a general air compression method.

[0005] In the case of the turbo system, the spiral impeller is rotated at an extremely high speed (40,000 revolutions), and compressed air is generated on the blade surface in the rotating direction of the impeller by utilizing the inertial load of air. Is to happen. At this time, since the generated compressed air has a large kinetic energy in the circumferential direction, when the compressed air is pushed out from the impeller, the air is also compressed by colliding with the impeller case or the like. More specifically, as shown in FIG. 11, the compression of the air is a blow compression in which air is strongly blown on the blade surface by several blades and a collision compression by kinetic energy.

[0006]

However, in such a conventional compressed air generator, in the case of a screw type which is generally used in a capacity compression type, when oil is used for a seal, In addition, there are problems such as mixing of oil into compressed air, oil management, increase in power consumption at low load, and time required for restart. If oil is not used, the sealing efficiency between the rotors and ultra high speed rotation exceeding 10,000 rotations per minute are required.

[0007] On the other hand, in the air compression operation of a turbo-type compressor, it is difficult to make the compression stroke uniform on the blade surface. Avoid vibration and resonance. In other words, it is necessary to provide the impeller with ultra-high speed rotation, and in the region below the middle air volume, a surging phenomenon (turbulence, backflow, their vibration, resonance) occurs, and the compression action becomes unstable, and the control becomes unstable. It becomes difficult and has practical problems. In the compression stroke, 80,000G
The structure is expensive due to the striking of the air with the above acceleration. Further, it is difficult to reduce the size of the turbo system for the above-described reason, and only the large system exists on the market.

In general, a compressed air generator can be applied to small to large capacity ones, can operate with high efficiency, is easy to operate and maintain, and can easily produce clean compressed air. In addition, it is desired that the motor has a rotation speed of a general-purpose motor and is easy to manufacture.

The present invention has been made in view of such a conventional problem, and uses a plurality of capillary airways which are easy to manufacture and utilizes the acceleration due to the centrifugal force generated in the rotating body, thereby making each of them smaller. Uniform and stable air compression process in the capillary airway prevents surging phenomenon, eliminates oil and other consumable materials, reduces operating costs, and has a simple structure and reduces manufacturing costs. It is an object of the present invention to provide a compressed air generator capable of performing the above-mentioned operations.

[0010]

Means for Solving the Problems The gist of the present invention for solving the above problems lies in the following inventions. [1] The impeller (30) is rotated in the casing (20) so that air taken into the rotation center side of the impeller (30) is taken out as compressed air from the outer peripheral side of the impeller (30). In the compressed air generator, the impeller (3
0) has an inner peripheral surface (37), an outer peripheral surface (38), a side plate, and a capillary airway (33);
An airway inlet (32) is formed around the center of rotation of the impeller (30) and is located at substantially equal intervals in the circumferential direction, and the outer peripheral surface (38) is provided on the impeller (30). An outer peripheral surface (38), an airway outlet (34) corresponding to the airway inlet (32), and the side plates forming both side surfaces of the impeller (30); The capillary airway (33) includes the airway inlet (32) and the airway outlet (3).
4) The compressed air generating device, wherein the compressed air generating device communicates with the impeller (30) and extends spirally with the rotation center of the impeller (30) concentric.

[2] The impeller (3) in the casing (20)
0), the air taken into the rotation center side of the impeller (30) is taken out as compressed air from the outer peripheral side of the impeller (30). Are the inner peripheral surface (37), the outer peripheral surface (38),
It has a side plate and a capillary airway (33), and the inner peripheral surface (37) is formed around the rotation center of the impeller (30), and is arranged at substantially equal intervals in the circumferential direction, and (3
0) has a plurality of airway inlets (32) located at substantially equal intervals in a direction parallel to the rotation axis direction of the outer peripheral surface (3).
8) constitutes an outer peripheral surface (38) of the impeller (30), has a plurality of airway outlets (34) corresponding to the respective airway inlets (32), and the side plate is provided with a blade. Car (3
0), wherein said tubular airways (33)
Is the corresponding airway inlet (32) and airway outlet (34)
And a helical extending concentrically with the center of rotation of the impeller (30).

[3] The impeller (3) in the casing (20)
0), the air taken into the rotation center side of the impeller (30) is taken out as compressed air from the outer peripheral side of the impeller (30). Are the inner peripheral surface (37), the outer peripheral surface (38),
It has a side plate and an airway, and the inner peripheral surface (37) has an airway inlet (315) formed around the rotation center of the impeller (30) and located at substantially equal intervals in the circumferential direction. The outer peripheral surface (38) constitutes an outer peripheral surface (38) of the impeller (30), and has an airway outlet (316) corresponding to the airway inlet (315); The side plate constitutes both side surfaces of the impeller (30), and the airway includes the airway entrance (315) and the airway exit (316).
And has an anterior chamber (310), a posterior chamber (311) and a tubular airway bundle, wherein the anterior chamber (310) comprises:
An airway entrance (315) side of the airway,
The rear chamber is disposed on the airway outlet (316) side of the airway, and the capillary airway bundle includes a plurality of capillary airways (3).
3), and each of the capillary airways (33) communicates with the front chamber (310) and the rear chamber (311), and spirally with the rotation center of the impeller (30) concentric. A compressed air generator, which extends.

[4] The side plate has a flange (31L,
31R) and the flanges (31L, 31R).
R) extends in a direction radiating from the rotation center of the impeller (30) with respect to the outer peripheral surface (38) of the impeller (30), and has a compressed air extraction passage (313). The compressed air extraction passage (313) extends from the inner surface of the flange facing the outer peripheral surface (38) of the impeller (30) toward the outer surface of the flange opposite to the inner surface of the impeller (30). The compressed air generator according to [1], [2], or [3], wherein the compressed air generator is skewed in the rotation direction.

[5] The inner peripheral surface (3) of the impeller (30)
7) has a slope portion, and the slope portion is inclined in the rotation direction of the impeller (30) with respect to the rotation center direction of the impeller (30), and the airway entrance (32, 315) [1], [2], which is established on the slope.
The compressed air generator according to [3] or [4].

Next, the operation of the invention described in each of the above items will be described.

[0016] In the compressed air generating device described in the item [1], when the impeller (30) rotates in the casing (20), air is opened on the inner peripheral surface (37) of the impeller (30). Into the capillary airway (33) through the airway entrance (32). The air that has entered the capillary airway (33) is compressed and moves to the airway outlet (34) side formed on the outer peripheral surface (38) of the impeller (30), and then each airway outlet (34).
From the side to the casing (20) side.

The air entering each of the capillary airways (33) is accelerated by the centrifugal force of the rotating impeller (30),
Compressed uniformly and stably by the mass of air. In this way, the air is uniformly and stably compressed in each of the capillary airways (33).
Turbulence, backflow, their oscillations, and resonance are prevented.
At this time, the state of compression of the air in each of the capillary airways (33) is not uniform and differs depending on conditions such as the position and shape of each of the capillary airways (33).

[0018] In the compressed air generator according to the item [2], when the impeller (30) rotates in the casing (20), air is opened on the inner peripheral surface (37) of the impeller (30). Into the capillary airway (33) through the airway entrance (32). The air that has entered the capillary airway (33) is compressed and moves to the airway outlet (34) side formed on the outer peripheral surface (38) of the impeller (30), and then each airway outlet (34).
From the side to the casing (20) side.

The respective airway inlets (32) are arranged at substantially equal intervals in the circumferential direction and at substantially equal intervals in a direction parallel to the rotation axis direction of the impeller (30). Face (3
7), and an airway outlet (34) is also opened on the outer peripheral surface (38) corresponding to each airway inlet (32), so that each airway inlet (32) and each airway outlet (34) are connected. A large number of capillary airways (33) can be provided, and a large amount of air can be efficiently compressed by the multiple capillary airways (33).

[0020] In the compressed air generator according to the item [3], when the impeller (30) rotates in the casing (20), air is opened on the inner peripheral surface (37) of the impeller (30). And enters each airway through the airway entrance (315).

The air that has entered each airway is once in the front chamber (31).
0) and enters each of the tubular airways (33) of the tubular airway bundle from the anterior chamber (310). The air that has entered the capillary airway (33) is compressed, and the compressed air flows out to the rear chamber (311) and is eventually discharged from the airway outlet (316) to the casing (20).

That is, even when the opening area of the airway entrance (315) is increased and a large amount of air is taken in, a large amount of air is efficiently compressed in each of the capillary airways (33) of the capillary airway bundle. Can be.

In the compressed air generator according to the item [4], when the impeller (30) rotates in the casing (20), air passes through each airway inlet (32, 315) and enters the capillary airway (33). Into the airway exit (34, 31)
It is discharged from the 6) side to the casing (20) side.

The compressed air is supplied to the airway outlet (34, 31).
When the compressed air is discharged from the 6) side to the casing (20) side, the compressed air passes through the compressed air extraction passage (313) of the flange (31L, 31R). At this time, since the compressed air extraction passage (313) is skewed outward in the rotation direction of the impeller (30), the impeller (3)
When 0) rotates, air relatively moving along the inner circumference of the flange can be forcibly taken into the compressed air extraction passage (313) and discharged to the casing (20) side.

[0025] In the compressed air generator described in the item [5], when the impeller (30) rotates in the casing (20), air is opened on the inner peripheral surface (37) of the impeller (30). Through the airway entrance (32,315)
3), it is compressed and moves to the airway outlet (34, 316) side, and is discharged from each airway outlet (34, 316) side to the casing (20) side.

When air enters the airway entrance (32, 315), the inner peripheral surface (37) of the impeller (30) where the airway entrance (32, 315) is opened is a slope, and the slope is formed. Since the portion is inclined in the direction of rotation of the impeller (30) with respect to the direction of the center of rotation of the impeller (30), the airway entrance (3, 315) is opened facing the direction of rotation, When the impeller (30) rotates, air moving relatively along the inner peripheral surface (37) of the impeller (30) can be forcibly taken in.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a first embodiment of the present invention. The compressed air generator includes a filter 10, a casing 20, an impeller 30, a mechanical seal 40, and a motor 50.

The impeller 30 has an inner peripheral surface 37 which is a corrugated impeller airway entrance surface, and an outer peripheral surface 38 which is a similarly corrugated impeller airway exit surface. In each of the waveforms, a high-pressure portion and a low-pressure portion are generated by rotation of the impeller 30.

The airway entrance 32 is located at this high pressure portion. On the other hand, in the airway exit 34, it is arranged in this low pressure portion. This makes it easier and more effective to take in and take out air from the impeller 30.

A compression function is provided by a wedge effect generated between the outer surface of the impeller 30 and the inner surface of the casing.

At both ends of the impeller 30, flanges 31R and 3R are provided.
1L is attached. The flanges 31 </ b> R and 31 </ b> L prevent a mixture of the high-pressure portion and the low-pressure portion generated on the inner peripheral surface 37 and the outer peripheral surface 38 due to the rotation of the impeller 30. In addition, in the flange 31R, 31L, in the airway surface of the capillary airway,
A key is provided to take in air from the low pressure section.

On the outer peripheral surface 38, a cut is provided in the high pressure portion so that air can be taken out only from the high pressure portion. The cutting is in the form of a wedge or propeller to facilitate air intake and removal,
It has a compressing action.

In FIG. 4, the filter 10 functions to remove dust in the air to be compressed, prevent clogging of the capillary airways, and obtain clean compressed air.

The casing 20 is an outer frame of the air compression device, in which the filter 10 is mounted, and the compressed air discharge port 2 is provided.
2. Attach the mechanical seal 40 and house the impeller 30. The casing 20 is fixed to the base 21.

The mechanical seal 40 includes a motor shaft 51
And between the impeller 30 and the casing 20, and between the impeller 30 and the casing 20, which are different in shape, but isolate the atmospheric pressure and the compressed air, and the suction air pressure and the compressed air.

The motor 50 is an electric motor (motor) as a power source for air compression. The motor 50 has a motor shaft 5
The impeller 30 is fixed to the motor shaft 51.

The structure of each component will be described in more detail.

As shown in FIG. 4, the casing 20 is an outer frame of the air compression device, and accommodates a mounting port for the filter 10, a compressed air discharge port 32, a mechanical seal 40, and an impeller 30.

The motor 50 is fixed to the same base by the casing base 21. The compressed air discharge ports 22 are provided on the left and right sides of the casing 20. A mechanical seal 40 is attached to the casing 20. The mechanical seal 40 is provided between the motor shaft 51 and the casing 20 and between the impeller 30 and the casing 20, and has different shapes. Isolate from air.

FIG. 1 is a sectional view taken along line II of FIG. 3, and FIG. 3 is a side view of the impeller.

As shown in FIGS. 1 and 3, the impeller 30
Are the impeller air inlet 35, the airway inlet 32, the capillary airway 3
3. It has an airway outlet 34, an inner peripheral surface 37, and an outer peripheral surface 38. A flange 31L and a flange 31R are attached to both sides of the impeller 30. In the flange 31L,
The motor shaft 51 is fixed and the compressed air extraction passage 31
3. There is a compressed air outlet passage wing 312.

As shown in FIG. 5, the flange 31R has
There are an impeller air inlet 35 and a compressed air outlet passage 313, each of which has an air inlet blade 314 and a compressed air outlet passage blade 312. The air intake inlet wing 314 and the compressed air outlet passage wing 312 are processed into a wedge shape or a propeller shape.

The impeller air inlet 35 is a low pressure portion of the inner peripheral surface 37 which will be described in detail in the operation. The air intake wing portion 314 is provided on the inner peripheral surface 3 as described in detail of operation.
Fix the high-pressure section 7 in place.

As shown in FIG. 1, the compressed air outlet passage 3
Reference numeral 13 denotes a high-pressure portion of the outer peripheral surface 38 which will be described in detail of the operation.

The compressed air outlet passage wing portion 312 is fixed to a position where a low pressure portion of the outer peripheral surface 38, which will be described in detail in operation, is closed. As shown in FIG. 1, the impeller 30 rotates left. Next, the operation of the first embodiment will be described.

In FIG. 6, air from which dust in the atmosphere has been removed by the filter 10 flows through an impeller air inlet 35.
The air enters the impeller 30, which is the compressor body, by the air intake wings 314 provided on the flanges 31L and 31R.

The impeller 30 that rotates to the left is the inner peripheral surface 3 of FIG.
Due to the waveform shape of 7, a high-pressure air portion A and a low-pressure air portion B are generated. The air intake wing 314 is fixed to a position where the high pressure portion of the inner peripheral surface 37 is closed, and prevents a mixture of the high pressure air portion A and the low pressure air portion B.

The introduced air enters the capillary airway 33 from the airway inlet 32 formed in the high-pressure air section a of the airway inlet surface 37. The air that has entered the capillary airway 33 is compressed by the mass of the air due to the acceleration caused by the centrifugal force of the rotating impeller 30. At this time, the state of compression in each capillary airway 33 is not uniform, but is determined by conditions such as the position of each capillary airway 33 and the state of processing. The compression by each of the capillary airways 33 prevents turbulence, backflow, their vibration and resonance in the compression process.

The air compressed by the acceleration of the centrifugal force flows out of the airway outlet 34 toward the casing 20. The outer peripheral surface 38 of the impeller 30 is processed into a waveform. In the waveform, a high-pressure air portion C and a low-pressure air portion D are generated by rotation of the impeller 30. The airway outlet 34 is provided in the low-pressure air section d, and discharges the compressed air to the casing 20 side. The corrugated shape of the outer peripheral surface 38 produces a wedge effect between the casing 20 and the high-pressure air portion c, and compresses air.

The compressed air outlet wings 312 provided on the flanges 31L and 31R are provided with compressed air outlets 313.
Fixed to the low-pressure air section except for The compressed air outlet passage blades 312 prevent the high-pressure air section C from mixing with the low-pressure air section d.

The compressed air outlet passage 313 is provided in the high-pressure air section c. The compressed air that has flowed out of the compressed air outlet passage 313 is supplied to the compressed air discharge port 2 provided on the side surface of the casing 20.
2 to the outside. The number, length, cross-sectional area, and shape of the capillary airways 33 are determined by the purpose of compression, the degree of difficulty in processing, and the amount of air to be performed.

In the invention according to the first embodiment, the air confined in the capillary airway is gently compressed by its own weight and acceleration.

The operation is such that a force of about 500 G can be easily obtained at the same impeller 30 diameter, and this structure is used to easily compress air by using the structure of the capillary airway 33 as in the present invention. Becomes possible. The reason that the air compression becomes possible is that the adoption of the capillary airway 33 makes it possible to make the compression stroke uniform and stable, and also to prevent flooding, turbulence, backflow, their vibration and resonance in the compression stroke. I was able to do it. In the first embodiment, the operation principle is completely different from that of the conventional compressor using the centrifugal force because the acceleration uses pure centrifugal force.

In the first embodiment, as described above, by employing the capillary airway 33, the compression is performed quietly in each of the capillary airways 33 without the need for an enormous acceleration. The air compressor is always stable and easily compressed within a wide range of air flow without generating a surging phenomenon which is the biggest problem of the conventional turbo compressor.

Next, a second embodiment of the present invention will be described.

FIG. 7 is a side view of the impeller, and FIG.
FIG. 3 is a sectional view taken along line III.

As shown in FIGS. 7 and 8, the impeller 30
Is the whole rotating body having an air compression function. Impeller 30
Has an impeller air inlet 35, an inner peripheral surface 37, an airway inlet 31
5, airway 36, anterior chamber 310, tubular airway bundle 39, posterior chamber 31
1, an airway 36, an airway exit 316, and an outer peripheral surface 38.

On both sides of the impeller 30, flanges 31L,
The flange 31R is attached. The flange 31L is
The motor shaft 51 is fixed and the compressed air extraction passage 31
3. It has a compressed air outlet passage wing portion 312. The flange 31R has an impeller air inlet 35 and a compressed air outlet passage 313, each of which has an air inlet wing 314 and a compressed air outlet passage wing 312.

The air inlet wing 314 and the compressed air outlet passage wing 312 are processed into a wedge shape or a propeller shape. The impeller air inlet 35 is a low-pressure portion of the inner peripheral surface 37. The air intake wing part 314 is fixed to a place where the high pressure part of the inner peripheral surface 37 is closed. As shown in FIG. 8, the compressed air extraction passage 313 is a high-pressure portion of the outer peripheral surface 38.
The compressed air extraction passage wing portion 312 is fixed to a position where the low pressure portion of the outer peripheral surface 38 is closed. In FIG. 8, the impeller 30 rotates left.

The operation of the second embodiment will be described.

There is no problem when the compression state of each of the capillary airways 33 is substantially uniform. However, in the case where a large number of capillary airways 33 are used, the impeller Due to the arrangement of the airway inlets 32 and the airway outlets 34, it is difficult to equalize the conditions for air inflow and outflow, and a surging phenomenon may occur between the capillary airways 33 or inside the capillary airways 33. .

In the case of the problem described in the preceding paragraph, the thin tube airways 33 are not provided directly at the narrow tube airway air inlet 32 and the airway outlet 34 of the impeller 30, and the thin tubes are used as the thin tube airway bundle 39 in FIG. A large number is one bundle, and a front chamber 310 and a rear chamber 311 are provided before and after the bundle.

The front chamber 310 and the rear chamber 311 are connected to the airway 36 and are in contact with the airway inlet 315 and the airway outlet 316.

The main compression step is carried out by the airway bundle 39, and the airway entrance 315 and the airway outlet 316 are taken in or taken out of the airway, and air is taken in and taken out.

As a result, problems in the compression process occurring in each of the capillary airways 33 are prevented.

Next, a comparison between the features of the present invention and a conventional turbo compressor will be described.

Even when a large number of capillary airways 33 are used, it is difficult to equalize the intake and extraction of air from the impeller 30 because of the desired pressure and air volume. A surging phenomenon may occur inside the capillary airway 33. The main cause of the inconvenience is that the conditions are different depending on the position of taking in and taking out the air from each capillary airway 33.

In that case, each tubular airway 33
To the airway entrance 315 of the impeller 30 and the airway exit 316
, The capillary airway 33 is made into one bundle, and the front chamber 310 and the rear chamber 311 are provided before and after the bundle. The front room 310 and the rear room 311 are connected to the airway 36 and are in contact with the airway entrance 315 and the airway exit 316.

As a result, the compression process in each capillary airway 33 can be made uniform, and the surging phenomenon and interference between the capillary airways can be prevented.

When the accelerations generated by the conventional turbo type compressor and the compressor of the present invention are compared in terms of structural values, the following results are obtained.

Next, a description will be given of an example of a trial calculation of acceleration generated by a turbo-type compressor currently on the market. Impeller 30
The radius of 0.05 m, the number of rotations of 40,000 rpm, and α in the circumferential direction at this time are obtained as follows.

Acceleration α = rω ² = 0.05 × (2π40000 / 60) ² ≒ 876,408 (m / s ² ) r: radius (m) ω = 2πn (rad / sec) 876,408 in terms of force /9.8≒89,429 (G) The acceleration calculated here is the acceleration of the extreme end portion B of the blade A in the impeller 30 of FIG. 11, and is the maximum acceleration of the impeller 30. Acceleration of blade A and air E
Is compressed by the acceleration relative inertia force C of the mass of The compressed air repelled from the blade A has a large amount of kinetic energy D, and the kinetic energy D collides with a turbo casing or the like and is reduced again.

Next, an example of a trial calculation of acceleration according to the present embodiment will be described.

The radius of the impeller 30 is 0.05 m, the number of rotations is 3,
000 rpm, here, the radius of the impeller 30 is the same as that of the turbo system, and the rotational speed of the impeller 30 is as follows when the acceleration is obtained using the synchronous rotational speed of the bipolar motor at 50 Hz.

Acceleration α = rω ² = 0.05 × (2π3000 / 60) ² ≒ 4,929 (m / s ² ) r: radius (m) ω = 2πn (rad / sec) 4,929 in terms of force /9.8≒502(G) The acceleration calculated here is the acceleration of the end portion of the capillary airway 33 and the capillary outlet portion 34 in FIG. 6, and is the maximum acceleration in the capillary airway 33. This acceleration causes the air to collapse and compress due to its own mass.

Next, the actual comparison of the air compression methods will be described. It is on the ground that a pressure of 1 kg / cm ² is generated in 1G. The pressure of the compressed air actually used in the factory is 7 kg / cm ^{2 when} it is generated, and about 4 kg / cm ² for tools and the like actually used. When compared with these, as shown in the above trial calculation values, the air is processed with a large acceleration that cannot be compared.

It is not easy to generate the rotational speed of 40,000 rpm required by the conventional turbo type compressor, and keeping the rotational speed running for a long period of time requires a lot of cost and expertise for maintenance. Since it requires it, it becomes an expensive product. The main reason for this is, of course, the nature of the air. In the present embodiment, these characteristics having air are fully utilized. By adopting the structure, pressure is applied to air as if pressure is applied to water. Therefore, by adopting the present invention,
Compressed air can be obtained in a simple form.

Next, a third embodiment of the present invention will be described. 9 and 10 show a third embodiment of the present invention. When designing according to the present invention, the discharge pressure of the compressor and the discharge air volume have the following relationship.

The discharge pressure is proportional to the length of the capillary airway 33 and the rotation speed of the impeller 30. The discharge air volume is proportional to the diameter of the capillary airway 33 and the quantity of the capillary airway 33. Regarding the stability in the compression stroke, the capillary airway 3
3 is inversely proportional to tubule airway length. In the shape of the airway entrance surface and the airway exit surface, it is necessary to consider that the air flow is not disturbed for efficient intake and exhaust.
The distance between the impeller 30 and the casing is also a final compression stroke, and is sufficiently studied. At the same time, consideration must be given to the flow of compressed air. In addition, when a large amount of air flows and a plurality of narrow airways are arranged vertically and horizontally, the airflow in the axial direction becomes unstable. As a result of designing in consideration of the above, a compressor having a four-pole structure was obtained as shown in FIGS.

As shown in FIG. 10, four small tube blocks 39 are embedded in the impeller 30 to design a large air volume. As a result, in an area of 20 to 25% or less of the maximum air volume, an unstable area occurred with an increase in the discharge pressure. Therefore, in order to stop the compression stroke in these air volume regions, a suction adjusting valve 60 is provided between the filter 10 and the air intake as shown in FIG. The process was stopped. Further, in a compressor of a high pressure design, it may be necessary to combine two or three stages.

[0081]

According to the compressed air generating apparatus of the present invention, a plurality of narrow air passages which are easy to manufacture are used, and the acceleration due to the centrifugal force generated in the narrow air passages is used, whereby each of the narrow air passages is formed. The process of compressing air can be made uniform and stable, and the occurrence of a surging phenomenon can be prevented. Consumable materials such as oil are not required, so that operating costs can be reduced, and the structure is simple and manufacturing costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line II of FIG. 3;

FIG. 2 is a configuration diagram of a compressed air generator according to the first embodiment of the present invention.

FIG. 3 is a side view of the impeller according to the first embodiment of the present invention.

FIG. 4 is a side view of the impeller according to the first embodiment of the present invention.

FIG. 5 is a side view of the side plate according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram of a compression process of the compressed air generator according to the first embodiment of the present invention.

FIG. 7 is a side view of an impeller according to a second embodiment of the present invention.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a side view of an impeller according to a third embodiment of the present invention.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

FIG. 11 is an explanatory view of a compression process of a conventional compressed air generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Filter 20 ... Casing 21 ... Base 22 ... Compressed air discharge port 30 ... Impeller 31R ... Flange 31L ... Flange 32 ... Airway inlet 33 ... Capillary airway 34 ... Airway outlet 35 ... Impeller air inlet 36 ... Airway 37 ... Inner circumference Surface (impeller airway entrance surface) 38 ... Outer peripheral surface (impeller airway exit surface) 39 ... Capillary airway bundle 310 ... Front chamber 311 ... Rear chamber 312 ... Compressed air extraction passage wing 313 ... Compressed air extraction passage 314 ... Air intake Mouth wing section 315 ... Airway entrance 316 ... Airway exit

Claims (5)

[Claims] 1. A compressed air generator in which an impeller is rotated in a casing to take out air taken into a rotation center side of the impeller as compressed air from an outer peripheral side of the impeller. , An inner peripheral surface, an outer peripheral surface, a side plate, and a capillary airway. The inner peripheral surface is formed around the rotation center of the impeller, and has an airway inlet located at substantially equal intervals in the circumferential direction. The outer peripheral surface constitutes an outer peripheral surface of an impeller, has an airway outlet corresponding to the airway entrance, and the side plate constitutes both side surfaces of the impeller, The compressed air generating device is characterized in that the capillary airway communicates with the airway inlet and the airway outlet, and extends spirally with the rotation center of the impeller concentric. 2. A compressed air generator in which an impeller is rotated in a casing to take out air taken into the rotation center side of the impeller as compressed air from an outer peripheral side of the impeller. , An inner peripheral surface, an outer peripheral surface, a side plate, and a capillary airway, wherein the inner peripheral surface is formed around a rotation center of the impeller, and is disposed at substantially equal intervals in a circumferential direction, and It has a plurality of airway entrances located at substantially equal intervals in a direction parallel to the rotation axis direction, and the outer peripheral surface constitutes an outer peripheral surface of an impeller, and an airway outlet corresponding to each of the airway entrances. The side plate constitutes both side surfaces of the impeller, and the capillary airway communicates with the corresponding airway entrance and the airway exit, and is concentric with the rotation center of the impeller. Compressed air generating device, which extends in a spiral shape . 3. A compressed air generating apparatus wherein an impeller is rotated in a casing to take out air taken into the rotation center side of the impeller as compressed air from an outer peripheral side of the impeller. , An inner peripheral surface, an outer peripheral surface, a side plate, and an airway, wherein the inner peripheral surface is formed around the rotation center of the impeller, and has an airway inlet located at substantially equal intervals in a circumferential direction. The outer peripheral surface constitutes an outer peripheral surface of an impeller, has an airway outlet corresponding to the airway entrance, and the side plate constitutes both side surfaces of the impeller, The airway communicates with the airway inlet and the airway outlet, and has an anterior chamber, a posterior chamber, and a capillary airway bundle.The anterior chamber is disposed on the airway inlet side of the airway, The rear chamber is disposed on the airway exit side of the airway, The bundle is composed of a plurality of capillary airways, wherein each of the capillary airways communicates with the front chamber and the rear chamber, and extends spirally with the rotation center of the impeller concentric. Compressed air generator. 4. The compressed air discharge passage, wherein the side plate has a flange, and the flange extends in a direction radiating from a rotation center of the impeller to an outer peripheral surface of the impeller. The compressed air extraction passage is inclined in the rotational direction of the impeller from the inner surface of the flange facing the outer peripheral surface of the impeller toward the outer surface of the flange opposite to the inner surface of the flange. The compressed air generator according to claim 1, 2 or 3, wherein: 5. The impeller has an inner peripheral surface having a slope portion, wherein the slope portion is inclined in a direction of rotation of the impeller with respect to a rotation center direction of the impeller, and the airway entrance is The compressed air generator according to claim 1, 2, 3 or 4, wherein the compressed air generator is provided on a slope.