KR101253086B1 - Energy saving device for oil injection type screw compressor - Google Patents

Abstract

PURPOSE: An energy saving type screw air compressor using an intake air controlling device is provided to improve the operation efficiency of the screw air compressor, to extend the lifetime, and to save costs for power. CONSTITUTION: An energy saving type screw air compressor using an intake air controlling device comprises an intake control valve, an airflow guide(19), a plurality of balance relief pistons(20), a bellow(14), an intake valve(15), and a float check valve(18). The intake control valve converts the pressure of the system generated in a no-load state into an atmosphere pressure state, forms a vacuum state by completely blocking air from an air intake port, and is formed into one body with an air filter for minimizing the load of a motor. The intake control valve is composed of an upper chamber housing unit(13), a cover(30) integrally assembled with a lower chamber housing unit(31), and a body(21). The airflow guide minimizes resistance caused by an air flow, thereby improving the intake efficiency of an inlet of the screw air compressor. The balance relief pistons are alternately operated for preventing damage caused by changes in an inner bearing state and a backlash caused by a rapid load change of the motor and the air compressor when instantaneously blocking the valve. The intake valve moves upwardly in a loading state so that the air flows into the screw air compressor. The intake valve moves downwardly in the no-load state, thereby blocking air intake to the inside of the screw air compressor. The float check valve prevents the air containing oil from flowing backwardly and being emitted to the atmosphere.

Description

Energy saving device for oil injection type compressor with intake air controller

The present invention relates to an energy-saving screw air compressor device using an intake air control device, which minimizes the load of the motor while making the pressure in the system generated at no load to atmospheric pressure and completely blocking the air to the air intake side to make a vacuum state. A suction control valve is formed integrally with the air filter so that the suction control valve is formed of a cover and a body, which are integrally assembled with the upper chamber housing and the lower chamber housing. Airflow guide to increase the suction efficiency of screw air compressor inlet with minimum reduction, and to prevent damage due to internal bearing and backlash change caused by sudden load change of motor and air compressor when the valve is momentarily shut off A plurality of balanced relief pistons and a discharge pressure Bellows that open and close the intake valve while moving up and down by receiving the signal from the sensor and receiving the air pressure of the air oil separator by the controller through the flow path of the solenoid valve or the vacuum pressure through the body vacuum hole, and moving up and down by the bellows. Closed by its own weight and moved up or down at start-up to allow atmospheric air to flow into the screw air compressor, and unloaded air flows down to block the inflow of air into the screw air compressor. In order to prevent the discharge of oil into the bellows, the oil discharged through the backflow oil inlet is introduced into the bellows, and then floated by the bellows filled oil, and a float check valve for recovering oil back into the compressor and a metal filter are formed. Keep at atmospheric pressure Therefore, the present invention relates to an energy-saving screw air compressor device through an intake air controller configured to save about 15% of energy compared to a compressor to which a conventional intake system is applied.

In general, an air compressor is a mechanical device that generates air to have a constant pressure by compressing air by various compression mechanisms such as a plunger and a screw. In order to compress air, a driving means such as a diesel engine or an electric motor is used. This is necessary.

In addition, a conventional air compressor operates a compressor unit while a motor is driven. Accordingly, air from the atmosphere is sucked into the air intake port and introduced into the compressor unit through an inlet valve, compressed by a compressor to a constant pressure, and discharged through a discharge valve. It is a configuration that is configured to be transferred to the necessary process of the site.

In this way, the air compressor is used as an auxiliary energy generating means to be used for various purposes that require compressed air in the field. -by) It is being operated while being maintained.

And once the power is turned on before starting work, the compressor is always kept in operation until the work is completed and the power is interrupted.

Therefore, even if the compressed air is not used in the actual work site, the operation load is maintained in the compressor which is in standby, which not only wastes electric energy, but also shortens the lifespan of the operating device and decreases the operation efficiency of the device, thereby reducing economic efficiency. There is a problem that leads to a decrease in productivity and an overall cost.

Meanwhile, the air compressor used in Korea is an oil-injected air compressor, and the operating system is a loading or unloading operation method. Currently, many manufacturers actually use about 60% of the installed capacity. .

In addition, the load factor is about 50% at no load of the remaining 40% of the load ratio.

Therefore, there is a need for the development of an air compressor that can reduce the power cost for the remaining 50% load-free load rate of about 40% of the load rate.

In order to achieve this, a voltage inverter is widely used as a method of controlling the speed of an electric motor by installing an air compressor.However, the price competitiveness decreases significantly due to an increase in the initial investment cost of the customer. There is a problem that additional failures such as shortening the life of the electric motor, shortening the life of the compressor bearing due to the shift.

In order to solve the above problems, the actual load rate of the air compressors used by each manufacturer is about 60% of the air amount, and 40% of the air amount is no load, so unnecessary electric energy is consumed, thereby saving energy. Its purpose is to reduce the production cost and power cost of manufacturers by developing the suction control valve for power consumption, reducing unnecessary power load and load.

In order to achieve the above object, the intake control valve is formed integrally with the air filter so as to minimize the load of the motor while making the pressure in the system generated at no load to atmospheric pressure and completely blocking the air to the air intake side to make the vacuum state. The suction control valve is formed of a cover and a body which are integrally assembled with the upper chamber housing and the lower chamber housing, and the inside of the body increases the suction efficiency of the screw compressor inlet while reducing drag due to air flow to a minimum. Airflow guide, a plurality of balanced relief pistons that interoperate to prevent damage due to internal bearings and backlash changes caused by rapid load changes of motors and air compressors when the valve is momentarily shut off Receive the signal and follow the flow path of the solenoid valve by the controller Bellows that open and close the intake valve while moving up and down by receiving the back pressure of the air oil separator or vacuum pressure through the body vacuum hole, and closed by self weight when moving up and down by the bellows, Inlet valves that allow air to flow into the screw air compressor and no load goes down to block air inflow into the screw air compressor, and oil discharged through the backflow oil inlet to prevent the back of the oil mixed air from being discharged into the atmosphere during stop. Is introduced into the bellows and is subsequently lifted by the oil filled in the bellows to form a float check valve to recover the oil back into the compressor.The internal pressure remains at atmospheric pressure even under no load operation, resulting in approximately 15% of the compressor with the conventional suction system. Save energy It relates to an energy-saving screw air compressor device through the intake air control device configured to be.

The present invention provides a screw air compressor equipped with a device that can save power, thereby reducing the operating efficiency and power ratio of the air compressor caused by the continuous operation load on the air compressor when the compressed air is not used in the field It is possible to reduce the cost by increasing the operation efficiency of the device, extending the lifespan, reducing power costs, and improving productivity by preventing increase, shortening of device life, and deterioration of productivity.

Therefore, there is an effect that can save hundreds of billions of years of energy.

1 is a working process diagram schematically showing a state in which the main portion of the present invention operates.
Figure 2 is a cross-sectional view showing the assembled state of the main portion of the suction control valve of the present invention.
Figure 3 is a schematic cross-sectional view showing the assembled state of the main portion of the suction control valve of the present invention.
4 is a reference diagram showing a state of no-load air flow by the operation of the suction control valve which is the main part of the present invention.
5 is a reference diagram showing the internal pressure discharged air flow after the no-load operation of the intake control valve which is the main part of the present invention.
6 is a working process diagram showing the air flow at the time of the intake control valve which is the main part of the present invention.
7 is an operation process diagram showing the air flow at the stop of the intake control valve which is the main part of the present invention.
8 is a working process diagram showing the air flow during construction of the inlet control valve, which is the main part of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a component comprises a component, it is understood that it may include other components, not control of the other component, unless specifically stated otherwise.

First, in the present invention, the air introduced into the compressor as shown in FIG. 1 is removed by dust, foreign matters, etc. through the air filter 10, and is sucked into the screw air compressor 3 through the suction control valve (11).

Here, the screw air compressor (3) is operated by the motor (1), the suction air is compressed by the rotation of the screw air compressor (3).

 At the same time, the oil is supplied to the screw air compressor (5) through the oil filter (4), discharged through the air compressor discharge port flows to the air oil separator (5), the compressed air and oil in the air oil separator (5) Compressed air is separated through three stages of air and oil separation.

Here, the compressed air is a configuration that is supplied to the cooler air oil cooler 12 inside the compressor through the check valve (6).

Meanwhile, the suction control valve 11 is formed of a cover 30 and a body 21 which are integrally assembled with the upper chamber housing 13 and the lower chamber housing 31 as shown in FIGS. 2 and 3.

In addition, an airflow guide 19 is formed in the body 21 to increase the inlet suction efficiency of the screw air compressor 3 while reducing drag due to air flow to a minimum.

In addition, when the valve is momentarily shut off, it operates cross-cutting to prevent damage caused by the change of the internal bearing and backlash due to the rapid load change of the motor and the air compressor, and the air oil through the internal flow path and the metal filter 16 at no load. A balance relief piston 17 is formed to discharge the separator rear end pressure A to the atmosphere and to prevent the release of the internal pressure of the air oil separator 5 at the time of loading.

When the valve is momentarily shut off, it prevents damage caused by the internal bearing and backlash change caused by the rapid load change of the motor 1 and the air compressor 2, and discharges the air pressure into the internal flow path and the compressor inside at no load, The balance relief piston 20 is formed in which the oil ring 20 'in the piston is formed so as to prevent the release of the internal pressure of the air oil separator 5 and prevent the oil-containing air from being released into the atmosphere.

Receiving air while moving up and down by receiving the pressure of the discharge pressure sensor 7 and receiving the vacuum pressure through the air oil separator rear end pressure A or the body vacuum hole 22 according to the flow path of the solenoid valve 9 by the controller 8 A bellows 14 is formed which opens and closes the valve 15.

The bellows 14 is moved up and down by the bellows and is closed by its own weight when it stops, and when it is started or the load is moved up, the atmospheric air flows to the screw air compressor 3, or the load goes down and the screw air compressor 3 inside. Intake valve 15 for blocking the air inlet is formed.

Then, in order to prevent the oil-mixed air from flowing back into the atmosphere during stopping, the oil discharged through the backflow oil suction port 23 is taken into the bellows 14 and then lifted up by the oil filled in the bellows 14, and the compressor again. A float check valve 18 for recovering oil is formed.

Referring to the operation of the present invention made of the above configuration in detail as follows.

First, in the present invention, the discharge pressure sensor 7 detects the air pressure that varies according to the amount of compressed air used to control the load, the unload, the modulation, and the auto-stop operation. That's the way.

As shown in FIG. 4, the intake valve 15 before the initial startup is blocking the intake air to the compressor 3 by its own weight. At the same time, the power is supplied to the solenoid valve 9 and the screw according to the operation of the motor 1 is started. The vacuum is generated in the body 21 by the rotation of the air compressor (3).

Here, a flow path is formed through the vacuum hole 22 to the hole 24 in the body chamber, and a vacuum pressure is formed.

As the air inside the body 21 is vacuumed by the vacuum pressure, the intake valve 15 is completely opened by the bellows 14 to start full-scale compression.

Here, the compressed air is separated from the oil in the air oil separator (5) and then passed through the check valve (6), after being cooled to a predetermined temperature in the air oil cooler 12 inside the compressor, the configuration is supplied to the line to be.

5 illustrates the no-load operation. When the internal pipe pressure is provoked to the set pressure, the power of the solenoid valve 9 is cut off in response to the detection of the discharge pressure sensor 7, and the rear end of the air oil separator is caused by the solenoid valve 9. Pressure (A) is supplied to the main chamber (B) to block the intake air to the intake valve (15) and the air compressor (3) and at the same time the rear end pressure (A) of the air oil separator is located at the lower end of the balance relief piston (17). Inflow.

At this time, in order to prevent the intake valve 15 from closing momentarily when the pressure is supplied to the main chamber (B), the balance relief piston 17 and the balance relief piston 20 are raised above 3 mm to block the intake valve 15. You can stop it momentarily.

Here, the balance in the process of closing the valve completely because the back pressure (A) of the air oil separator is supplied to the main chamber (B) and the force of the suction air going to the intake valve 15 and the air compressor 3 is continuously applied. As the lower end of the relief piston 17 leaks, the rear end pressure A of the air oil separator is released into the atmosphere through the inner flow path and the metal filter 16, and the air pressure of the front end of the air oil separator B is discharged into the compressor. As a result, the internal pressure of the system changes to atmospheric pressure, and the valve is closed.

FIG. 6 is a flow chart of air load, and when the internal piping pressure is lower than the set pressure, the solenoid valve 9 is supplied with power to the inside of the body 21 by the solenoid valve 9 according to the detection of the discharge pressure sensor 7. The vacuum line is formed again, and a flow path is formed into the hole 24 in the body chamber through the vacuum hole 22.

Through this, the main chamber (B) air is vacuumed by the vacuum pressure, and the intake valve 15 is completely opened by the bellows 14 to start the compression again.

At the same time, the line discharged to the atmosphere through the metal filter 16 is blocked due to the rear end pressure A of the air oil separator at the lower end of the balance relief piston 17.

In addition, since the line discharged to the inside due to the rear end pressure B of the balance relief piston 20 is also blocked, discharge of the pressure inside the body 21 is stopped, and the compressed air is again separated from the air oil separator 5 After the oil is separated from the oil) and passes through the valve 6, it is cooled to a predetermined temperature in the air oil cooler 12 inside the compressor, and then supplied to the air storage tank (not shown).

7 and 8 are air flow diagrams for stopping and starting, the solenoid valve 9 is cut off at the time and the air oil separator rear pressure A is supplied to the main chamber (B) by the solenoid valve 9. At the same time, the intake air to the intake valve 15 and the air compressor 3 is blocked, and at the same time, the rear end pressure A of the air oil separator flows into the lower end of the balance relief piston 17.

In addition, the air oil separator shear pressure (B) also flows into the lower end of the balance relief piston (17), and at this time, the balance relief piston (17) and the balance relief so as not to close the intake valve momentarily when supplied to the main chamber (B). As the piston 20 is raised above 3mm, the intake valve 15 is temporarily blocked.

At this time, the lower end of the balance piston piston 17 leaks, and the rear pressure A of the air oil separator is discharged to the atmosphere through the metal filter 16 through the internal flow path, and the front end input B of the air oil separator is also inside the compressor. As the air pressure is discharged, the pressure inside the body 21 is changed to an atmospheric pressure state and the valve is completely closed.

Therefore, the motor 21 is configured to stop while the power is cut off.

As described above, the present invention provides a screw air compressor equipped with a device capable of saving power, and thus, the operation efficiency of the air compressor caused by the sustained operation load on the air compressor when the compressed air is not used in the field. It is possible to reduce the cost by increasing the operation efficiency of the device, extending the lifespan, reducing the power cost, and improving productivity by preventing degradation, increasing power cost, shortening the life of the device, and reducing productivity. have.

The present invention is shown in Table 1 below when comparing the electric energy required with the conventional model.

Comparison table of the prior art and the present invention emphysema RPM Load switching pressure No load withstand voltage No-load output Load output value Power saving rate Conventional A 1770  6 ~ 8 bar  3 bar  20kw  40kw Conventional B 1770  6 ~ 8 bar  4 bar  22kw  38kw Invention 1770  6 ~ 8 bar  Atmospheric pressure  8 kw  36kw  14.44%

Table 1 shows that when the load ratio is 40%, the average difference between the no-load averages of A and B is 13 kw and 13x0.4 / 36x100 = 14.44%.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may be implemented in a combined manner.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

01. Motor 02. Coupling
03. Screw air compressor 04. Oil filter
05. Air oil separator 06. Check valve
07. Discharge Pressure Sensor 08. Controller
09. Solenoid Valve 10. Air Filter
11. Suction control valve 12. Air oil cooler
13. Upper chamber housing 14. Bellow
15. Intake valve 16. Metal filter
17. Balance relief piston 18. Float check valve
19. Airflow Guide 20. Balanced Relief Piston
20 '. Oil ring 21.Body
22. Body vacuum hole 23. Backflow oil inlet
24. Hole in Body Chamber 30. Cover
31. Lower chamber housing A. Pressure after air oil separator
B. Shear Pressure of Air Oil Separator
end. Atmospheric air
I. Main Chamber Air
All. Air oil separator shear air
la. After-air air separator
hemp. Vacuum air

Claims (7)

An intake control valve formed integrally with the air filter 10 to minimize the load of the motor 1 while making the pressure in the system generated at no load to atmospheric pressure and completely blocking air to the air intake side to make the vacuum state. 11),
The suction control valve 11 is formed of a cover 30 and a body 21 which are integrally assembled with the upper chamber housing 13 and the lower chamber housing 31,
The body 21 has an air flow guide 19 for increasing the inlet suction efficiency of the screw air compressor 3 while reducing drag due to air flow to a minimum, and when the valve is momentarily shut off of the motor and the air compressor. A plurality of balance relief pistons 17 and 20 that are operated crosswise to prevent damage due to rapid changes in the internal bearing and backlash;
Receiving air while moving up and down by receiving the pressure of the discharge pressure sensor 7 and receiving the vacuum pressure through the air oil separator rear end pressure A or the body vacuum hole 22 according to the flow path of the solenoid valve 9 by the controller 8 Bellows 14 for opening and closing the valve 15,
The bellows 14 is moved up and down by the bellows, when it is stopped, it is closed by its own weight, and when it is started or the load is moved up, atmospheric air flows into the screw air compressor 3 and no load goes down into the screw air compressor 3. Intake valve 15 for blocking the inflow of air,
In order to prevent the oil-mixed air from flowing back into the atmosphere during stop, the oil discharged through the backflow oil inlet 23 is taken into the bellows 14 and then lifted up by the oil filled in the bellows 14 and back into the compressor. Float 첵 valve (18) for recovering the energy-saving screw air compressor device through the intake air control, characterized in that the internal pressure is configured to be maintained at atmospheric pressure even under no-load operation. The method of claim 1,
When the lower end of the balance piston piston 17 is leaked, the rear pressure A of the air oil separator is discharged to the atmosphere through the inner flow path and the metal filter 16, and the air oil separator front end input B is also introduced into the compressor. The energy-saving screw air compressor device through the intake air control device, characterized in that the valve 21 is configured to be completely closed while the internal pressure of the body 21 is changed to the atmospheric pressure while being discharged. The method of claim 1,
The intake valve 15 blocks intake air to the compressor 3 by its own weight, and at the same time the power is supplied to the solenoid valve 9 and the screw air compressor 3 according to the operation of the motor 1 is operated. The vacuum is generated inside the body 21 by the rotation, the vacuum pressure is formed while the flow path is formed into the hole 24 in the body chamber through the vacuum hole 22,
As the air inside the body 21 is vacuumed by the vacuum pressure, the intake valve 15 is completely opened by the bellows 14 to start full-scale compression, and the compressed air separates oil from the air oil separator 5. Then, after passing through the valve (6), after cooling to a predetermined temperature in the air oil cooler (12) inside the compressor, energy-saving screw air through the intake air controller, characterized in that configured to be supplied to the line Compressor unit. The method of claim 1,
As the power of the solenoid valve 9 is cut off in response to the detection of the discharge pressure sensor 7, the air oil separator rear end pressure A is supplied to the main chamber (B) by the solenoid valve 9 to intake the valve 15. And blocking the intake air to the air compressor (3) and at the same time the rear end pressure (A) of the air oil separator flows into the lower end of the balance relief piston (17),
In order to prevent the intake valve 15 from closing momentarily when the pressure is supplied to the main chamber (B), the balance relief piston 17 and the balance relief piston 20 are raised 3 mm or more to temporarily block the intake valve 15. The air oil separator rear end pressure (A) is supplied to the main chamber (B), and the valve is completely closed because the force of the suction air to the intake valve 15 and the air compressor 3 is continuously applied. As the lower end of the balance relief piston 17 leaks during the losing process, the rear pressure A of the air oil separator is discharged to the atmosphere through the inner flow path and the metal filter 16, and the shear pressure B of the air oil separator is also inside the compressor. Energy-saving screw through intake air controller, characterized in that the system pressure is changed to atmospheric pressure and the valve is closed as the air pressure is discharged to the furnace Group a compressor unit. The method of claim 1,
As the power of the solenoid valve 9 is supplied according to the detection of the discharge pressure sensor 7, the vacuum line is formed again inside the body 21 by the solenoid valve 9, and the body chamber is formed through the vacuum hole 22. After the flow path is formed through the inner hole 24, the main chamber (B) air is vacuumed by the vacuum pressure, and the intake valve 15 is completely opened by the bellows 14 to start compression again, and the balance relief piston ( 17, the line discharged to the atmosphere through the metal filter 16 is blocked due to the rear end pressure (A) of the air oil separator,
The line discharged to the inside of the balance relief piston 20 by the air oil separator rear pressure (B) at the lower end of the balance relief piston is also interrupted and the discharge of the pressure inside the body 21 is stopped, and the compressed air is again the air oil separator (5). After the oil is separated from the 첵 valve (6) through the air oil cooler 12 inside the compressor is cooled to a predetermined temperature, and then supplied to the air storage tank through the intake air controller, characterized in that configured to Energy saving screw air compressor unit. The method of claim 1,
As the power of the solenoid valve 9 is cut off, the air pressure separator rear end pressure A is supplied to the main chamber (B) by the solenoid valve 9 to intake air to the intake valve 15 and the air compressor 3. At the same time, the rear end pressure (A) of the air oil separator flows into the lower end of the balance relief piston 17, and the air oil separator shear pressure (B) also flows into the lower end of the balance relief piston 17. In order to prevent the intake valve from closing at the moment of supply to the balance relief piston 17 and the balance relief piston 20, the intake valve 15 is momentarily blocked while being raised above 3 mm.
As the lower end of the balance piston piston 17 leaks, the rear end pressure A of the air oil separator is discharged to the atmosphere through the metal filter 16 through the internal flow path, and the front end input B of the air oil separator is also introduced into the compressor. Energy-saving screw air compressor device through the intake air control device, characterized in that the valve is completely closed as the pressure inside the body 21 changes to atmospheric pressure while the air pressure is discharged. The method of claim 1,
In order to prevent the oil-containing air from being discharged to the atmosphere and to maintain the internal vacuum state of the suction side of the screw air compressor 3 after the intake valve 15 is closed, the balance relief piston 20 has an oil ring 20 '. Energy-saving screw air compressor device through the intake air control device, characterized in that is configured to be formed).

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