JPH0633899A - Washing of blade wheel of air compressor equipped with vane control device and washing device - Google Patents

Abstract

PURPOSE:To clean the suction side surface of a blade wheel, suppressing the disturbance of the air stream on the suction side of the blade wheel. CONSTITUTION:An injection nozzle 28 or injection hole for jetting a washing liquid towards the suction side of the first stage blade wheel 10 is installed on the guide pipe 18 of a vane control device 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for cleaning impellers in an air compressor used as a factory air source or a plant air source.

[0002]

2. Description of the Related Art An air compressor used as a factory air source or a plant air source requires a highly efficient compressor in order to reduce power consumption of the plant. In addition, since it is necessary to continuously operate a plant that uses compressed air, an air compressor that can be continuously operated for 1 to 2 years is required.

As an air compressor for satisfying such requirements, a centrifugal impeller, an axial flow impeller, or a turbo compressor combining them is usually used.

FIG. 6 is a partially longitudinal front view of a turbo compressor provided with a vane control device, and FIG. 7 is a transverse enlarged plan view of FIG.

The turbo compressor shown in these figures has a drive shaft 1 connected to a power source (not shown) and supported by bearings 2, a gear 3 attached to the drive shaft 1, and the gear 3
The pinions 4,5 meshed with the pinions 4,5
Of the rotating shafts 6 and 7 mounted on the rotating shafts 6 and 7 supported by the bearings 8 and 9, and the first and second stage impellers 10 and 11 mounted on both sides of the one rotating shaft 6 and the other rotating shaft 7. 3rd and 4th stage impellers 12, 13 mounted on both sides,
The vane control device 15 connected to the upstream side of the suction casing 14 of the first-stage impeller 10 and the first-stage impeller 1
No. 0 is connected via a discharge pipe 21 to the second stage impeller 11 and is connected to a second stage impeller 11 via a suction pipe 23, and an aftercooler connected to the discharge side of the fourth stage impeller 13 (not shown). And). The vane control device 15 includes a vane control casing 16 connected to the upstream side of the suction casing 14 of the first-stage impeller 10 and a center of the first-stage impeller 10 supported by a support 17 inside the vane control casing 16. Inside the vane control casing 16 and the guide pipe 18 installed on the shaft OO, the vane drive mechanism (not shown) is arranged at equal intervals in the circumferential direction and is supported via bearings 19. ) And a plurality of vanes 20 connected to each other.

In the turbo compressor, the air sucked through the vane control device 15 is compressed by the first-stage impeller 10, and the air pressurized by the first-stage impeller 10 passes through the discharge pipe 21 and is intercooled. It is cooled by 22. The air cooled by the intercooler 22 is sucked into the second-stage impeller 11 through the suction pipe 23, and the second-stage impeller 11, the third-stage impeller 12 and the fourth
The stage impeller 13 sequentially compresses and increases the pressure to a predetermined pressure. The air whose pressure has been increased to the predetermined pressure is cooled to a predetermined temperature by an aftercooler installed on the discharge side of the fourth-stage impeller 13, and is then pumped and used as a factory air source or a plant air source for use. .

By the way, the handling air in the air compressor generally contains dust. When these dusts adhere to the impeller, there is a problem that the impeller loses balance and becomes inoperable, and the impeller loses its initial smoothness, increasing friction loss and causing performance deterioration. there were.

Therefore, an air filter is conventionally provided on the suction side of the impeller, and dust is collected by this air filter. Further, as shown in FIG. 8, an injection nozzle 24 is provided in the suction casing 14 of the first-stage impeller 10, and the cleaning liquid is injected from the injection nozzle 24 to the first-stage impeller 10 to I try to wash off the dust that has adhered.

As a conventional technique of this kind, Japanese Patent Laid-Open No.
6-165800, JP-A 61-142399, JP-A 63-243497, JP-A 63-
246499, JP-A-63-106400, JP-A-63-212798, JP-A-1-69.
There are techniques described in Japanese Patent Publication No. 799, Japanese Patent Laid-Open No. 2-207200, and the like.

[0010]

However, among the above-mentioned conventional techniques, the technique in which the air filter is provided on the suction side of the impeller cannot prevent dust from adhering to the impeller during long-time operation. However, there is a problem in that the operation of the air compressor must be stopped, the air compressor must be disassembled, and maintenance such as cleaning must be performed.

Further, in the prior art shown in FIG. 8, the injection nozzle 24 is provided in the suction casing 14 of the first stage impeller 10 and is attached separately from the vane control device 15. Therefore, the injection nozzle 24 disturbs the flow of air immediately before the first-stage impeller 10 is sucked, and the first-stage impeller 10 is disturbed.
There was a problem that reduced the performance of.

In all of the prior arts described in the above-mentioned publications, no consideration is given to injecting the cleaning liquid from the position on the central axis of the impeller toward the suction side of the impeller.

A first object of the present invention is to provide an air provided with a vane control device which can cleanly and efficiently clean the entire suction side surface of the impeller and which does not disturb the air flow on the suction side of the impeller. A cleaning method and a cleaning device for an impeller of a compressor.

A second object of the present invention is to provide an impeller cleaning device for an air compressor equipped with a vane control device capable of cleaning not only the impeller but also the suction side surface of the vane of the vane control device. Especially.

A third object of the present invention is a method for cleaning an impeller of an air compressor equipped with a vane control device capable of maintaining a constant injection amount of cleaning liquid even if the suction pressure of the impeller fluctuates. And to provide a cleaning device.

[0016]

The first object is to inject a cleaning liquid from a guide pipe of a vane control device toward a suction side of an impeller, and to clean at least the surface of the impeller with the cleaning liquid. To be achieved.

The first object is achieved by providing either the injection nozzle or the injection hole for injecting the cleaning liquid toward the suction side of the impeller at the tip of the guide pipe of the vane control device. It

The second object is achieved by providing either the injection nozzle or the injection hole for injecting the cleaning liquid toward the suction side of the vane in the middle part of the guide pipe of the vane control device.

Further, the second purpose is to provide an injection nozzle or an injection hole for injecting the cleaning liquid toward the suction side of the impeller at the tip of the guide pipe of the vane control device, and to provide the guide pipe of the guide pipe. This is better achieved by providing either the injection nozzle or the injection hole for injecting the cleaning liquid toward the suction side of the vane in the middle abdomen.

The third purpose is to inject the cleaning liquid from the guide pipe of the vane control device toward the suction side of the impeller, and to detect both the suction side pressure of the impeller and the supply pressure of the cleaning liquid to detect both pressures. The differential pressure is calculated, the differential pressure is compared with the set value of the suction side pressure of the impeller, the cleaning liquid supply amount is adjusted based on the comparison result, and the cleaning liquid is supplied to the suction side pressure of the impeller. This is achieved by controlling the pressure so that it is always kept high by a constant value.

The third purpose is to provide a guide pipe of the vane control device with an injection nozzle or an injection hole for injecting the cleaning liquid toward the suction side of the impeller.
A cleaning liquid supply circuit is provided which has a cleaning liquid pump and a cleaning liquid flow control valve and which supplies the cleaning liquid from the outside of the suction casing of the impeller through the inside of the guide pipe to either the injection nozzle or the injection hole. Insert a pressure sensor into each of the suction casing and the downstream side of the cleaning liquid flow control valve in the cleaning liquid supply circuit, connect both pressure sensors to a differential pressure transmitter, and connect between the differential pressure transmitter and the cleaning liquid flow control valve. This can also be achieved by connecting a controller that adjusts the opening degree of the cleaning liquid flow rate control valve based on the differential pressure detection signal from the differential pressure transmitter.

[0022]

In the present invention, the cleaning liquid is sprayed toward the suction side of the impeller from the spray nozzle or the spray hole provided at the tip of the guide pipe of the vane control device. In this way, the injection nozzle or the injection hole is provided in the guide pipe of the vane control device located on the central axis of the impeller, and the cleaning liquid is injected from the injection nozzle or the injection hole toward the suction side of the impeller. As a result, the entire surface of the suction side of the impeller can be cleaned cleanly and efficiently with a small amount of cleaning liquid, and it is possible to eliminate the problem that causes air turbulence on the suction side of the impeller.

Further, in the present invention, an injection nozzle or an injection hole for injecting the cleaning liquid toward the suction side of the vane is provided in the middle part of the guide pipe of the vane control device. By spraying the cleaning liquid from this spray nozzle or spray hole, the suction side surface of the vane of the vane control device can be cleaned, and at the same time, the cleaning liquid sprayed from the spray nozzle or spray hole also cleans the suction side surface of the impeller. Can be washed.

Further, according to the present invention, a jet nozzle or a jet hole is provided at each of the tip portion and the abdomen of the guide pipe of the vane control device, and the jet nozzle or jet hole is provided at the tip portion of the guide pipe. The surface of the suction side of the impeller is directly washed with the cleaning liquid, and the surface of the vane on the suction side is mainly cleaned with the cleaning liquid injected from the injection nozzle or the injection hole provided in the middle part of the guide pipe. The suction side surface of the car and the suction side surface of the vane can be cleaned even more cleanly at the same time.

In the present invention, the guide pipe of the vane control device is provided with an injection nozzle or an injection hole for injecting the cleaning liquid toward the suction side of the impeller. Also,
A cleaning liquid supply circuit is provided in this injection nozzle or injection hole. This cleaning liquid supply circuit has a cleaning liquid pump and a cleaning liquid flow control valve. Pressure sensors are respectively inserted in the suction casing of the impeller and a downstream side of the cleaning liquid flow control valve in the cleaning liquid supply circuit. Both pressure sensors are connected to a differential pressure transmitter, and a controller is connected between the differential pressure transmitter and the cleaning liquid flow control valve. Then, the cleaning liquid supply circuit supplies the cleaning liquid from the outside of the suction casing of the impeller through the inside of the guide pipe to the injection nozzle or the injection hole, and directs the cleaning liquid from the injection nozzle or the injection hole toward the suction side of the impeller. To spray. At this time, the pressure sensor detects the suction pressure in the suction side casing of the impeller and the cleaning liquid supply pressure on the downstream side of the cleaning liquid flow control valve, and sends the detected value to the differential pressure transmitter. In this differential pressure transmitter, the differential pressure is calculated from the detection values sent from both pressure sensors, and the differential pressure detection signal is sent to the controller. This controller adjusts the opening of the cleaning liquid flow control valve based on the differential pressure detection signal sent from the differential pressure transmitter, and the supply pressure of the cleaning liquid is always higher than the suction side pressure of the impeller by a fixed value. Control to be. As a result, even if the suction pressure of the impeller fluctuates, the cleaning liquid supply pressure can always be kept higher than the suction pressure of the impeller by a constant value, and the injection amount of the cleaning liquid can be kept constant. In addition to avoiding wasteful consumption of the cleaning liquid and efficiently cleaning the impeller, it becomes possible to reliably collect and process the cleaning liquid containing dust.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention and is an enlarged cross-sectional view of the main part.

In the first embodiment shown in FIG. 1, a vane control device 15 is connected to the upstream side of the suction casing 14 of the first stage impeller 10. The vane control device 15 includes a vane control casing 16
, A guide pipe 18, a vane 20, and a vane drive mechanism (not shown). The vane control casing 16 is connected to the upstream side of the suction casing 14 of the first stage impeller 10. The guide pipes 18 are supported inside the vane control casing 16 by a plurality of supports 17 mounted at equal intervals in the circumferential direction, and on the central axis OO of the first-stage impeller 10. It is installed in.

The vanes 20 are arranged inside the vane control casing 16 at equal intervals in the circumferential direction, and are supported by bearings 19, respectively. The vane drive mechanism adjusts the angle of each vane 20 with respect to the intake air and the position of the vane control casing 16 in the radial direction.

By the way, in the impeller cleaning device according to the first embodiment of the present invention, the vane control device 1 is used.
5, a cleaning liquid supply pipe 25 attached to the vane control casing 16, a cleaning liquid passage 26 formed inside one support 17 and communicating with the cleaning liquid supply pipe 25, and formed inside a guide pipe 18, and An injection for injecting the cleaning liquid toward the suction side of the first-stage impeller 10 which is provided at the tip of the guide pipe 18 and communicates with the cleaning liquid passage 27 and the cleaning liquid passage 27 that communicates with the cleaning liquid passage 26. And a nozzle 28. The cleaning liquid supply pipe 25 is connected to a cleaning liquid supply circuit (not shown) having a cleaning liquid pump, a cleaning liquid flow control valve, and the like.

As the cleaning liquid, simple water, a mixture of water with another cleaning agent or a rust preventive agent, or a liquid replacing water with a cleaning agent or a rust preventive agent is used.

Next, the cleaning method of the present invention will be described with reference to the operation of the first embodiment.

When cleaning the first-stage impeller 10, when the cleaning liquid is pressure-fed to the cleaning liquid supply pipe 25 through the cleaning liquid supply circuit, the cleaning liquid passes through the cleaning liquid passage 26 formed inside the support 17 and enters the inside of the guide pipe 18. It is supplied to the injection nozzle 28 through the formed cleaning liquid passage 27,
Injection is performed from the injection nozzle 28 toward the suction side of the first-stage impeller 10.

The injection nozzle 28 has the first-stage impeller 10
It is provided at the tip of the guide pipe 18 installed on the central axis O-O. Therefore, as a result of the cleaning liquid being sprayed from the injection nozzle 28 to the central portion on the suction side of the first-stage impeller 10, the cleaning liquid is sprayed almost evenly on the suction-side surface of the first-stage impeller 10, so that a small amount of cleaning liquid is required. The suction side surface of the first-stage impeller 10 can be cleanly and efficiently cleaned. Further, as described above, the guide pipe 18 is installed on the central axis OO of the first-stage impeller 10, and the injection nozzle 28 is provided at the tip end portion of the guide pipe 18,
The turbulence of the air flow on the suction side of the first-stage impeller 10 due to the provision of the injection nozzle can be eliminated.

The dust washed from the surface of the first-stage impeller 10 by the cleaning liquid jetted from the jet nozzle 28 is separated from the air compressed by the first-stage impeller 10 together with the cleaning liquid, and contains dust. The cleaning solution is collected by a collecting device (not shown) and processed.

Next, FIG. 2 is an enlarged cross-sectional view of a main part showing a second embodiment of the present invention.

In the second embodiment shown in FIG. 2, at the tip of the guide pipe 18 of the vane control device 15,
An injection hole 29 is provided instead of the injection nozzle. A plurality of the injection holes 29 are provided around the tip of the guide pipe 18, and are arranged so that the cleaning liquid can be evenly injected toward the suction side of the first-stage impeller 10.

Therefore, also in the second embodiment, the suction side surface of the first-stage impeller 10 can be cleaned cleanly and efficiently, and the air flow on the suction side of the first-stage impeller 10 is not disturbed. It can be resolved.

The other structure and operation of the second embodiment are the same as those of the first embodiment.

Next, FIG. 3 is an enlarged cross-sectional view of the essential parts showing a third embodiment of the present invention.

In the third embodiment shown in FIG. 3, in the middle part of the guide pipe 18 of the vane control device 15,
A cleaning liquid injection hole 30 is provided. This injection hole 30
Are provided on the outer periphery of the middle part of the guide pipe 18 at equal intervals, and the cleaning liquid is evenly sprayed toward the suction side of the vane 20.

In the third embodiment, the cleaning liquid is sprayed toward the suction side of the vane 20 from a plurality of spray holes 30 provided in the middle portion of the guide pipe 18, so that the cleaning liquid can clean the vane 20. In addition to being able to clean the suction side surface cleanly, the suction side surface of the first stage impeller 10 can also be cleaned cleanly.

In the third embodiment, instead of the injection hole 30, a plurality of injection nozzles may be provided at equal intervals in the circumferential direction in the middle part of the guide pipe 18.

The other structure and operation of the third embodiment are the same as those of the first embodiment.

Further, FIG. 4 is an enlarged cross-sectional view of the essential part showing the fourth embodiment of the present invention.

In the fourth embodiment shown in FIG. 4, an injection nozzle 28 is provided at the tip of the guide pipe 18 of the vane control device 15, and an injection hole 30 is provided in the middle part of the guide pipe 18. ing. The injection nozzle 2
8 is provided so as to inject the cleaning liquid toward the suction side of the first-stage impeller 10 as in the first embodiment. Similar to the third embodiment, the injection holes 30 are provided on the outer periphery of the guide pipe 18 at equal intervals so that the cleaning liquid can be evenly injected toward the suction side of the vane 20. Has become.

As a result, in the fourth embodiment, the suction side surface of the first-stage impeller 10 is mainly washed with the cleaning liquid sprayed from the spray nozzle 28 provided at the tip of the guide pipe 18, and the guide is performed. The suction side surface of the vane 20 is cleaned by the cleaning liquid sprayed from the spray hole 30 provided in the middle part of the pipe 18. Therefore, the first-stage impeller 10
The suction side surface of the vane 20 and the suction side surface of the vane 20 at the same time,
In addition, it becomes possible to wash it more beautifully.

In the fourth embodiment, a plurality of injection holes 29 are provided at the tip of the guide pipe 18 as shown in FIG. 2, and the middle portion of the guide pipe 18 is provided in the third embodiment. As illustrated, a plurality of injection nozzles may be provided.

FIG. 5 shows a fifth embodiment of the present invention and is a systematic diagram of the main part.

In the fifth embodiment shown in FIG. 5, a cleaning liquid supply pipe 25 attached to the vane control casing 16 is provided with a cleaning liquid pump 31 and an electric valve 32 which is a cleaning liquid flow rate control valve. Further, the inlet side end of the cleaning liquid supply pipe 25 is inserted into a cleaning liquid tank (not shown). Further, a pressure sensor 33 is inserted in the suction casing 14 of the first-stage impeller 10, and another pressure sensor 34 is provided downstream of the motor-operated valve 32 in the cleaning liquid supply pipe 25.
Has been inserted. Both pressure sensors 33 and 34 are connected to a differential pressure transmitter 35. A controller 36 is connected between the differential pressure transmitter 35 and the electric valve 32. The controller 36 sends a control signal to the motor-operated valve 32 based on the differential pressure detection signal sent from the differential pressure transmitter 35 to adjust the opening degree, and with respect to the suction pressure of the first-stage impeller 10, The cleaning liquid supply pressure is controlled to always be kept high by a constant value.

The other structure of the fifth embodiment is the same as that of the first embodiment.

Next, the cleaning method of the present invention will be described with reference to the operation of the cleaning apparatus of the fifth embodiment.

When the cleaning liquid is pumped by the cleaning liquid pump 31 during the cleaning of the first-stage impeller 10, the cleaning liquid is a motor-operated valve 32 which is a cleaning liquid flow rate control valve → the cleaning liquid supply pipe 25 → the cleaning liquid passage formed inside the support 17. 26 → Sent to the injection nozzle 28 through the cleaning liquid passage 27 formed inside the guide pipe 18, and from the injection nozzle 28 to the first
It is injected to the suction side of the stage impeller 10.

At this time, the suction pressure of the first-stage impeller 10 is detected by the pressure sensor 33, and the detected value is sent to the differential pressure transmitter 35. Further, the pressure sensor 34 detects the cleaning liquid supply pressure, which is the pressure on the downstream side of the motor-operated valve 32 in the cleaning liquid supply pipe 25, and the detected value is also sent to the differential pressure transmitter 35. Here, in the differential pressure transmitter 35, the differential pressure is obtained from the detection values sent from the differential pressure sensors 33 and 34, and the differential pressure detection signal is sent to the controller 36. Therefore, the controller 36 sends a control signal to the electric valve 32 based on the differential pressure detection signal sent from the differential pressure transmitter 35, adjusts the opening degree of the electric valve 32, and adjusts the suction pressure of the first-stage impeller 10. On the other hand, the cleaning liquid supply pressure is controlled to always be kept high by a constant value.

Generally, when the suction pressure of the impeller is higher than the cleaning liquid supply pressure, the cleaning liquid is not jetted and the cleaning function is not exerted. Conversely, if the suction pressure of the impeller is too lower than the cleaning liquid supply pressure, the cleaning liquid is sprayed more than necessary and the cleaning liquid is wasted, and the cleaning liquid containing dust is collected downstream of the impeller. However, there may be a problem that the processing cannot be completed.

On the other hand, according to the fifth embodiment, even if the suction pressure of the first-stage impeller 10 fluctuates, the cleaning liquid supply pressure is always constant with respect to the suction pressure of the first-stage impeller 10. Since the amount of cleaning liquid is kept high, the amount of cleaning liquid can be kept constant. As a result, wasteful consumption of cleaning liquid can be avoided, and the suction side surface of the first-stage impeller 10 can be efficiently cleaned. It is possible to reliably collect and process the cleaning liquid containing the.

Of course, the fifth embodiment is not limited to the first embodiment, but can be applied to the second, third and fourth embodiments.

The present invention is not limited to the embodiments shown in the drawings, but can be applied to all air compressors equipped with a vane control device.

[0059]

According to the invention described in claim 1 of the present invention described above, the cleaning liquid is sprayed from the guide pipe of the vane control device toward the suction side of the impeller, and the cleaning liquid at least covers the surface of the impeller. Since it is cleaned, it has the effect of being able to clean the suction side surface of the impeller cleanly, and since it does not disturb the air flow on the suction side of the impeller, it can prevent the impeller performance from deteriorating. There is.

According to the second aspect of the present invention, the tip of the guide pipe of the vane control device is provided with either an injection nozzle or an injection hole for injecting the cleaning liquid toward the suction side of the impeller. Since it is provided, as in the case of the invention described in claim 1, there is an effect that the suction side surface of the impeller can be cleanly cleaned, and an effect that performance deterioration due to turbulence of the air flow on the suction side of the impeller can be prevented. is there.

Further, according to the invention described in claim 3 of the present invention, either the injection nozzle or the injection hole for injecting the cleaning liquid toward the suction side of the vane is provided in the middle part of the guide pipe of the vane control device. Therefore, there is an effect that the suction side surface of the vane of the vane control device and the suction side surface of the impeller can be cleaned cleanly. According to the invention of claim 4, the tip end portion of the guide pipe of the vane control device is obtained. In addition to providing either an injection nozzle or an injection hole for injecting the cleaning liquid toward the suction side of the impeller,
Since either the injection nozzle or the injection hole for injecting the cleaning liquid toward the suction side of the vane is provided in the middle part of the guide pipe, the suction side surface of the vane and the suction side surface of the impeller can be cleaned at the same time. There is an effect that the surface of the suction side of the impeller and the impeller can be cleaned more cleanly.

Further, according to the invention of claim 5 of the present invention, the cleaning liquid is injected from the guide pipe of the vane control device toward the suction side of the impeller, and
The pressure on the suction side of the impeller and the supply pressure of the cleaning liquid are detected to obtain the differential pressure between the two pressures, and this differential pressure is compared with the set value of the suction side pressure on the impeller, and the cleaning liquid is based on this comparison result. The supply amount is adjusted so that the cleaning liquid supply pressure is always kept higher than the suction side pressure of the impeller by a certain value, so even if the impeller suction pressure fluctuates, the cleaning liquid supply pressure will change. Is always kept high by a fixed value, and the amount of sprayed cleaning liquid can be kept constant. As a result, wasteful consumption of cleaning liquid can be avoided, and the impeller can be efficiently cleaned. There is also an effect that it can be collected and processed.

According to the sixth aspect of the present invention, the vane control device has a guide pipe provided with either an injection nozzle for injecting the cleaning liquid toward the suction side of the impeller or an injection hole. And a cleaning liquid flow control valve, and a cleaning liquid supply circuit that supplies the cleaning liquid from the outside of the suction casing of the impeller through the inside of the guide pipe to either the injection nozzle or the injection hole, and suction of the impeller A pressure sensor is inserted in each of the casing and the downstream side of the cleaning liquid flow control valve in the cleaning liquid supply circuit, both pressure sensors are connected to a differential pressure transmitter, and between the differential pressure transmitter and the cleaning liquid flow control valve, Since a controller for adjusting the opening of the cleaning liquid flow control valve based on the differential pressure detection signal from the differential pressure transmitter is connected, the blade is the same as the invention according to claim 5. The cleaning liquid supply pressure can be always kept high by a constant value even if the suction pressure of the liquid fluctuates, and the amount of the cleaning liquid sprayed can be kept constant. As a result, wasteful consumption of the cleaning liquid can be avoided and the impeller can be efficiently cleaned. There is also an effect that the cleaning liquid containing dust can be reliably collected and processed.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing a second embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of a main part showing a third embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a main part showing a fourth embodiment of the present invention.

FIG. 5 shows a fifth embodiment of the present invention and is a systematic diagram of essential parts.

FIG. 6 is a vertical cross-sectional front view of a turbo compressor provided with a vane control device.

7 is a cross-sectional enlarged plan view of FIG.

FIG. 8 is a cross-sectional view showing a conventional technique having a cleaning liquid injection nozzle.

[Explanation of symbols]

10 ... 1st-stage impeller, 14 ... 1st-stage impeller suction casing, 15 ... Vane control device, 16 ... Vane control casing, 18 ... Vane control device guide pipe, 20 ... Vane, 25 ... Cleaning liquid supply pipe , 26, 27 ... Cleaning liquid passage, 28 ... Cleaning liquid injection nozzle, 29, 30 ... Same injection hole, 31 ... Cleaning liquid pump, 32
... motor valve which is a cleaning liquid flow control valve, 33, 34 ... pressure sensor, 35 ... differential pressure transmitter, 36 ... controller of motor valve.

Claims (6)

[Claims] 1. An air compressor equipped with a vane control device, characterized in that a cleaning liquid is sprayed from a guide pipe of a vane control device toward a suction side of an impeller and at least the surface of the impeller is cleaned with the cleaning liquid. How to clean the impeller. 2. A vane control device comprising: a tip end portion of a guide pipe of the vane control device, wherein either a jet nozzle for jetting a cleaning liquid toward a suction side of an impeller or a jet hole is provided. Cleaning device for air compressor impeller. 3. An air provided with a vane control device, characterized in that a vane control device is provided with an injection nozzle or an injection hole for injecting a cleaning liquid toward the suction side of the vane, in the middle part of the guide pipe of the vane control device. Cleaning equipment for compressor impeller. 4. A vane control device is provided with either a jet nozzle or a jet hole for jetting a cleaning liquid toward a suction side of an impeller at a tip end portion of the guide pipe, and a vane is provided in a middle portion of the guide pipe. A cleaning device for an impeller of an air compressor equipped with a vane control device, which is provided with either a spray nozzle for spraying a cleaning liquid toward a suction side or a spray hole. 5. The cleaning liquid is jetted from the guide pipe of the vane control device toward the suction side of the impeller, and the pressure on the suction side of the impeller and the supply pressure of the cleaning liquid are detected to obtain the differential pressure between the two pressures. , Compare this differential pressure with the set value of the suction side pressure of the impeller, adjust the cleaning liquid supply amount based on this comparison result, and always maintain the cleaning liquid supply pressure at a constant value with respect to the suction side pressure of the impeller. A method for cleaning an impeller of an air compressor equipped with a vane control device, which is characterized in that it is controlled so as to be held high only. 6. A guide pipe of a vane control device is provided with either an injection nozzle or an injection hole for injecting the cleaning liquid toward the suction side of the impeller, and has a cleaning liquid pump and a cleaning liquid flow control valve, A cleaning liquid supply circuit for supplying a cleaning liquid from the outside of the suction casing through the inside of the guide pipe to either the injection nozzle or the injection hole is provided.
Pressure sensors are respectively inserted in the suction casing of the impeller and the downstream side of the cleaning liquid flow control valve in the cleaning liquid supply circuit, both pressure sensors are connected to a differential pressure transmitter, and the differential pressure transmitter and cleaning liquid flow control Between the valves, a controller for adjusting the opening of the cleaning liquid flow rate control valve based on a differential pressure detection signal from the differential pressure transmitter is connected, and the impeller of an air compressor equipped with a vane control device is characterized. Cleaning device.