CN100585185C - Compressor and operation method - Google Patents
Compressor and operation method Download PDFInfo
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- CN100585185C CN100585185C CN200810003045A CN200810003045A CN100585185C CN 100585185 C CN100585185 C CN 100585185C CN 200810003045 A CN200810003045 A CN 200810003045A CN 200810003045 A CN200810003045 A CN 200810003045A CN 100585185 C CN100585185 C CN 100585185C
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Abstract
The invention provides a compressor and an operating method thereof. A switching valve is fixed at the suction side of the main body of the compressor, and lower limit rotation rate of the motor is setted in a control device, wherein the gas volume discharged to the discharging side of the main body of the compressor is approximately same with gas volume leaked to the suction side. When the rotation rate of the motor is in a range above the lower limit rotation rate and below the upper limit rotation rate, a control device determins a control rotation rate for eliminating the bias of the detected pressure relatively to the preestablished target pressure, opens the switching valve when the control rotation rate is bigger than the lower limit rotation rate, and closes the switching valve when the control rotation rate is smaller than the lower limit rotation rate. According to the constructure, the range of the rotation rate control relatively to the volume control can be expanded, and the reflux of the oil to the suction side can be avoided.
Description
Technical field
The present invention relates to compressor and method of operation thereof.
Background technique
In general, in helical-lobe compressor, utilize the rotation of screw rotor to release the gas of discharging side, yet because cause gas to leak to the suction side between the screw rotor or the gap that forms between screw rotor and the housing.Along with rotating speed reduces, the phenomenon that this gas leaks to the suction side is more obvious.
For fear of excessively reducing and cause the leakage rate increase of pressurized gas to the low voltage side of compressor main body because drive the rotating speed of the motor of no oil feeding type helical-lobe compressor main body, for example open and record following method in the 2002-054578 communique: under the big situation of the predefined setting value of rotating ratio the spy, open the air-breathing adjustment valve of the suction side of being located at compressor main body and carry out the rotating speed control of motor, when rotating speed reaches predefined setting value, stop rotating speed control and the pressure oscillation that switches to and discharge side opens and closes the control of air-breathing adjustment valve accordingly.
Open the method for operation of putting down in writing in the 2002-054578 communique according to this spy, motor rotary speed can excessively not reduce, and can realize that the raising of compression efficiency, the abnormal temperature that prevents to discharge side rise, and can realize the reduction of power loss, be very useful invention.But, when the discharge capacity of load side need remain on low capacity, switch to the control of using air-breathing adjustment valve from rotating speed control.Use the control of air-breathing adjustment valve to have following problem: must carry out the switching of suction control valve continually, the loss of the mechanical parts such as valve body of air-breathing adjustment valve is a lot, is easy to generate the pulsation of pressure etc.Therefore, wish the scope of expansion rotating speed control to volume controlled, hope can be carried out all volume controlled by rotating speed control, and this requirement is to open the method for operation put down in writing in the 2002-054578 communique and irrealizable according to the spy.In addition, open the rotating speed control in the 2002-054578 communique and use the control of air-breathing adjustment valve and be used to come under the situation of type of cooling motor carrying out the spy from the air-supply that is installed on the cooling fan of motor drive shaft, the scope that rotating speed control is controlled capacity is: is full capacity (100%)～20% at motor during for induction motor, is full capacity (100%)～10% when motor is IMP motor (imbedding magnet just as the step motor).
As one of method of rotating speed being controlled the range expansion that capacity is controlled, consider the cooling effectiveness that improves motor.Open in the 2004-011503 communique the spy, record following method: with the motor of Driven Compressor main body cooling fan is set independently mutually, utilizes this cooling fan to carry out the cooling of motor effectively.
Consideration is opened in the helical-lobe compressor of the such no oil feeding type of 2002-054578 communique the spy, independently cooling fan as opening the 2004-011503 communique, the spy is set, adopt the spy to open the such method of operation of 2002-054578 communique, thereby can expand the scope of rotating speed control volume controlled.
But, in the helical-lobe compressor of oil injection type, the gas that leaks to the suction side moves along with oil, if rotating speed drops to low-down rotating speed, then to compare with the gas flow that goes out to the discharge thruster, the gas flow that leaks to the suction side is more, accompany with it, oil is to the suction side adverse current, is arranged at filter by suction in the stream of suction side by oil pollution, produced the problem that function reduces and intake reduces of filter.
Summary of the invention
The present application is to propose in view of the above problems, and its purpose is to provide the method for operation of oil injection type helical-lobe compressor, can expand the scope of rotating speed control to volume controlled, and avoids the problem of oil to the suction side adverse current.
In order to address the above problem, the 1st invention is a kind of compressor, comprising: compressor main body; Pressure detector is arranged on the discharge side of above-mentioned compressor main body; The motor that rotating speed is variable drives the above-mentioned compressor main body; Open and close valve is arranged on the suction side of above-mentioned compressor main body; And control gear, based on the pressure signal of expression from the detected pressures of above-mentioned pressure detector, output is used to control the control signal of the rotating speed of said motor, in above-mentioned control gear, set the lower limit rotating speed of said motor, under this lower limit rotating speed, roughly the same to the gas flow that the discharge thruster of above-mentioned compressor main body goes out with the gas flow that leaks to the suction side, more than above-mentioned lower limit rotating speed and in the scope below the maximum speed, determine that in control gear the control rotating speed of said motor is as above-mentioned control signal, this control rotating speed is used to eliminate the deviation of above-mentioned detected pressures with respect to predefined goal pressure, and, by above-mentioned control gear above-mentioned open and close valve is opened and closed, opening open and close valve under the big situation of the above-mentioned lower limit rotating speed of above-mentioned control rotating ratio, is that open and close valve is closed in situation ShiShimonoseki below the above-mentioned lower limit rotating speed at above-mentioned control rotating speed.
Perhaps, it is a kind of method of operation of compressor, this compressor comprises: compressor main body, pressure detector, be arranged on the discharge side of above-mentioned compressor main body, can carry out Pressure testing, control gear, based on the pressure signal of expression from the detected pressures of above-mentioned pressure detector, export the control signal of the rotating speed of the motor that is used for controlling and driving above-mentioned compressor main body, in above-mentioned method of operation, suction side in the above-mentioned compressor main body is provided with open and close valve, in above-mentioned control gear, set the lower limit rotating speed of said motor, under this lower limit rotating speed, roughly the same to the gas flow that the discharge thruster of above-mentioned compressor main body goes out with the gas flow that leaks to the suction side, in above-mentioned control gear, more than above-mentioned lower limit rotating speed and in the scope below the maximum speed, determine the control rotating speed, this control rotating speed is used to eliminate the deviation of above-mentioned detected pressures with respect to predefined goal pressure, opening above-mentioned open and close valve under the big situation of the above-mentioned lower limit rotating speed of above-mentioned control rotating ratio, is that situation ShiShimonoseki below the above-mentioned lower limit rotating speed is closed and stated open and close valve at above-mentioned control rotating speed.
The 2nd invention is a kind of compressor, comprise: compressor main body, pressure detector, be arranged on the discharge side of above-mentioned compressor main body, the motor that rotating speed is variable, drive the above-mentioned compressor main body, revolution detector, rotating speed to said motor detects, open and close valve, be arranged on the suction side of above-mentioned compressor main body, and control gear, based on the pressure signal of expression from the detected pressures of above-mentioned pressure detector, output is used to control the control signal of the rotating speed of said motor, in above-mentioned control gear, set the lower limit rotating speed of said motor, under this lower limit rotating speed, roughly the same by the gas flow that the discharge thruster to above-mentioned compressor main body goes out with the gas flow that leaks to the suction side, more than above-mentioned lower limit rotating speed and in the scope below the maximum speed, in control gear, determine control rotating speed as the said motor of above-mentioned control signal, this control rotating speed is used to eliminate the deviation of above-mentioned detected pressures with respect to predefined goal pressure, and, by above-mentioned control gear above-mentioned open and close valve is opened and closed, opening open and close valve under the situation big by the above-mentioned lower limit rotating speed of the detected rotating ratio of above-mentioned revolution detector, is being that open and close valve is closed in situation ShiShimonoseki below the above-mentioned lower limit rotating speed by the detected rotating speed of above-mentioned revolution detector.
Perhaps, it is a kind of method of operation of compressor, this compressor comprises: compressor main body, pressure detector, be arranged on the discharge side of above-mentioned compressor main body, can carry out Pressure testing, revolution detector, rotating speed to the motor that drives the above-mentioned compressor main body detects, control gear, based on the pressure signal of expression from the detected pressures of above-mentioned pressure detector, export the control signal of the rotating speed of the motor that is used for controlling and driving above-mentioned compressor main body, in above-mentioned method of operation, suction side in the above-mentioned compressor main body is provided with open and close valve, in above-mentioned control gear, set the lower limit rotating speed of said motor, under this lower limit rotating speed, roughly the same by the gas flow that the discharge thruster to above-mentioned compressor main body goes out with the gas flow that leaks to the suction side, be used to eliminate the control signal of above-mentioned detected pressures from above-mentioned control gear output with respect to the deviation of predefined goal pressure, the rotating speed of the scope inner control said motor more than above-mentioned lower limit rotating speed and below the maximum speed, and, opening above-mentioned open and close valve under the situation big by the above-mentioned lower limit rotating speed of the detected rotating ratio of above-mentioned revolution detector, is being that situation ShiShimonoseki below the above-mentioned lower limit rotating speed is closed and stated open and close valve by the detected rotating speed of above-mentioned revolution detector.
In the above-mentioned the 1st or the 2nd invention, also can be designed to, the running said motor stops said motor when closing above-mentioned open and close valve when opening above-mentioned open and close valve.
The the above-mentioned the 1st or the 2nd invention is if it is then preferred especially to be used for the compressor of oil injection type.
According to the present invention, set the lower limit rotating speed of the roughly the same motor of gas flow that is gone out by discharge thruster and the gas flow that leaks to the suction side to above-mentioned compressor main body, carry out rotating speed control more than motor rotary speed is the lower limit rotating speed and in the scope below the maximum speed, play following effect: can expand the scope of rotating speed control to volume controlled, being applied to avoid oil under the situation of oil-cooled type screw compressor, keep the function of the filter of suction side for a long time to the suction side adverse current.
Description of drawings
Fig. 1 is a skeleton diagram of implementing the helical-lobe compressor of method of operation of the present invention.
Fig. 2 is the figure of the relation between expression compressor power and the rotation speed of the fan.
Fig. 3 is that expression is used for determining the rotating speed of lower limit rotating speed and the figure of the relation between the air quantity.
Embodiment
Below, embodiments of the present invention are described with reference to the accompanying drawings.
Fig. 1 represents the oil injection type helical-lobe compressor 1 of embodiments of the present invention.This oil injection type helical-lobe compressor 1 has compressor main body 3, contains in this compressor main body 3 by motor 2 to drive and a pair of screw rotor of intermeshing negative and positive.Near the motor 2 of compressor main body 3, cooling fan 4 is arranged to can be towards motor 2 air-supplies.Side at compressor main body 3 connects suction passage 5, is connected with the opposing party and discharges stream 6.In suction passage 5, be provided with open and close valve 7.In discharging stream 6, be provided with oil and separate recover 8.The oil that separates recover 8 bottoms from oil retains portion 9 and extends and be provided with the oily stream 10 that is communicated with fuel feeding positions such as rotor chamber, bearing portion, axle envelope portion in the compressor main body 3.
In above-mentioned oil injection type helical-lobe compressor 1, the pressure detector 12 that is provided with revolution detector 11 that the rotating speed to motor 2 detects, the head pressure of discharging in the stream 6 is detected.Control gear 13 is controlled motor 2 based on detected pressures signal and predefined goal pressure from pressure detector 12 via transducer 14, and control open and close valve 7.In addition, control gear 13 is based on from the detection tach signal of revolution detector 11 and the rotating speed of controlling cooling fan 4 from the detected pressures signal of pressure detector 12.
Then, the method for operation to the helical-lobe compressor 1 of above-mentioned formation describes.
If the operator utilizes not shown operation panel to wait and switches starting, then control gear 13 recognizes the connection of switch starter, makes open and close valve 7 transfer out state to from closing state, thus starter motor 2.Thus, compressor main body 3 is driven, and is compressed from the gas that suction passage 5 is drawn into the compressor main body 3 via open and close valve 7, and pressurized gas is sent discharges stream 6.
Remain under the situation of high pressure at discharge stream 6, even switched starting by the operator, control gear 13 can starting compressor main body 3 yet.In the control output of determining based on rotating speed described later control (hereinafter referred to as the control rotating speed) is lower limit rotating speed when following, identical with above-mentioned control.Under these circumstances, control gear 13 cuts out open and close valve 7, makes motor 2 be in halted state, shows " keeping starting up to starting " this information on not shown TFT LCD etc., has continued to keep having discerned the state that switch starter is connected.Then, the pressurized gas of load side is consumed, and the pressure of discharging stream 6 reduces, and is being judged as the control rotating ratio lower limit rotating speed of being determined by rotating speed control described later when big, starting compressor main body 3.
From the detected pressures signal of pressure detector 12, when the needs of the rotating speed increase of motor 2 and pressurized gas reduce when starting, express rising trend, and on the contrary, when the needs of pressurized gas increase, express the tendency that descends.If receive the detected pressures signal from pressure detector 12, control gear 13 carries out for example PID control, keeps constant so that discharge the pressure of side.Promptly, control gear 13 calculating are from the pressure reduction of the detected pressures and the goal pressure of pressure detector 12, detected pressures be goal pressure when following to transducer 14 output control signals, so that the rotating speed of motor 2 increases the value corresponding with the absolute value of above-mentioned pressure reduction, detected pressures be goal pressure when above to transducer 14 output control signals, so that the rotating speed of motor 2 reduces the value corresponding with the absolute value of above-mentioned pressure reduction.Promptly, according to from the detected pressures and the goal pressure of pressure detector 12, determine that suitable control is exported promptly to control rotating speed.Like this, 13 pairs of transducers of control gear 14 output control signals are controlled the so-called rotating speed control of the rotating speed of motor 2, so that detected pressures is eliminated with respect to the deviation of predefined goal pressure.
This rotating speed is controlled in the scope that the lower limit rotating speed is above and maximum speed is following and carries out.What is called lower limit rotating speed is meant pressurized gas by amount that goes out to the discharge thruster and the roughly the same rotating speed of amount that leaks to the suction side, setting in control gear 13 in advance.Maximum speed is the maximum speed by the specification decision of motor 2.Above-mentioned lower limit rotating speed is the following lower limit rotating speed that draws: for example in the helical-lobe compressor 1 of Fig. 1, replace pressure detector 12 and flowmeter is set, obtain a plurality of air quantity from this flowmeter with respect to any rotating speed below the maximum (top) speed, as shown in Figure 3, representing rotating speed with transverse axis, representing with the longitudinal axis to paint a little on the chart of air quantity, with the each point of drawing link to each other the near linear that forms and air quantity be the rotating speed of intersection point of 0 transverse axis as pressurized gas by to discharging amount that thruster goes out and the roughly the same lower limit rotating speed of amount to the suction side leakage.Present inventors are utilizing this method to determine to find that this lower limit rotating speed is about 7% of a maximum speed behind the lower limit rotating speed of helical-lobe compressor of set specification.
In addition, control gear 13 according to opening open and close valve 7 from the detected pressures of pressure detector 12 and goal pressure under the big situation of definite control rotating ratio lower limit rotating speed, is that open and close valve 7 is closed in situation ShiShimonoseki below the lower limit rotating speed at above-mentioned control rotating speed.Running motor 2 stops motor 2 when cutting out open and close valve 7 when opening open and close valve 7.
According to above method of operation, when pressurized gas is above by the roughly the same lower limit rotating speed of amount that goes out to the discharge thruster and the amount of leaking to the suction side, carry out rotating speed control,, also can avoid oil to the suction side adverse current so can expand the scope of rotating speed control to volume controlled.
In addition, because oil can be to the suction side adverse current, so there is no need to be provided with the check valve that can bring the pressure loss in suction passage.Therefore, can avoid being provided with check valve, the pressure loss reduces, and suction efficiency improves.
And then, because when opening open and close valve 7, turn round motor 2, when closing open and close valve 7, stop motor 2, so there is not useless power consumption.
At this, the lower limit rotating speed of setting in control gear 13 also can be the rotating speed that increases a little on the lower limit rotating speed of obtaining like that at Fig. 3.This is because consider the influence of body difference to the small variations of lower limit rotating speed, can prevent the adverse current of oil to the suction side more reliably.
In addition, as long as can't help the operator by connection running stop switches such as not shown operation panels, control gear 13 just continues to keep being identified as the state of switch starter connection.So, as long as the operator disconnects the running stop switch, though temporary close open and close valve 7 and stop motor 2 after, if still starting once more at once of the words that condition satisfies.Promptly, control gear 13 keeps being identified as the state of having connected switch starter, like this, the pressurized gas of load side is consumed, and the pressure of discharging stream 6 reduces, when being judged as the control rotating ratio lower limit rotating speed of determining based on rotating speed control once more when big, the starting compressor main body 3 once more.
In addition, up to the present, show the operator and switch starting and will discharge stream 6 and remain under the situation of high pressure or the rotating speed that control is determined based on rotating speed is under the situation below the lower limit rotating speed, the example of control gear 13 inoperative compressor main bodies 3.But the invention is not restricted to this.For example, also can be under situation about switching starting by the operator, in the given time that has switched starting, forcibly make compressor main body 3 with predetermined rotation speed operation.
In addition, up to the present, show according to the example that whether carries out the switching of open and close valve 7 and the running of motor 2/stop by the control rotating speed of determining from the detected pressures of pressure detector 12 and goal pressure greatly than lower limit rotating speed.But the invention is not restricted to this.For example, also can carry out the running with motor 2 of opening of open and close valve 7 when big by the control rotating ratio lower limit rotating speed of determining from the detected pressures of pressure detector 12 and goal pressure, and be that the lower limit rotating speed carries out the switching of open and close valve 7 and stopping of motor 2 when following at detection rotating speed from revolution detector 11.
In addition, also the running with motor 2 of opening of open and close valve 7 can carried out from the detection rotating ratio lower limit rotating speed of revolution detector 11 when big.But, need to carry out disposal in this case: play through till the given time from starting with inferior, continue forcibly to make open and close valve 7 open and motor 2 (to such an extent as to compressor main body 3) with the what is called " originate mode " of predetermined rotation speed operation, arrive through (till " originate mode " end) till the given time, even the detection rotating speed from revolution detector 11 is below the lower limit rotating speed, also keep the running with motor 2 of opening of open and close valve 7.
Claims (8)
1. compressor comprises:
Compressor main body;
Pressure detector is arranged on the discharge side of above-mentioned compressor main body;
The motor that rotating speed is variable drives the above-mentioned compressor main body;
Open and close valve is arranged on the suction side of above-mentioned compressor main body; And
Control gear, based on the pressure signal of expression from the detected pressures of above-mentioned pressure detector, output is used to control the control signal of the rotating speed of said motor,
Wherein,
In above-mentioned control gear, set the lower limit rotating speed of said motor, roughly the same to the gas flow that the discharge thruster of above-mentioned compressor main body goes out under this lower limit rotating speed with the gas flow that leaks to the suction side,
In above-mentioned control gear, more than above-mentioned lower limit rotating speed and in the scope below the maximum speed of motor, the control rotating speed of determining said motor is as above-mentioned control signal, and this control rotating speed is used to eliminate the deviation of above-mentioned detected pressures with respect to predefined goal pressure
And, by above-mentioned control gear above-mentioned open and close valve is opened and closed, under the big situation of the above-mentioned lower limit rotating speed of above-mentioned control rotating ratio, open open and close valve, be that open and close valve is closed in situation ShiShimonoseki below the above-mentioned lower limit rotating speed at above-mentioned control rotating speed.
2. compressor comprises:
Compressor main body,
Pressure detector is arranged on the discharge side of above-mentioned compressor main body,
The motor that rotating speed is variable drives the above-mentioned compressor main body,
Revolution detector detects the rotating speed of said motor,
Open and close valve is arranged on the suction side of above-mentioned compressor main body, and
Control gear, based on the pressure signal of expression from the detected pressures of above-mentioned pressure detector, output is used to control the control signal of the rotating speed of said motor,
Wherein,
In above-mentioned control gear, set the lower limit rotating speed of said motor, roughly the same to the gas flow that the discharge thruster of above-mentioned compressor main body goes out under this lower limit rotating speed with the gas flow that leaks to the suction side,
In above-mentioned control gear, more than above-mentioned lower limit rotating speed and in the scope below the maximum speed of motor, the control rotating speed of determining said motor is as above-mentioned control signal, and this control rotating speed is used to eliminate the deviation of above-mentioned detected pressures with respect to predefined goal pressure
And, by above-mentioned control gear above-mentioned open and close valve is opened and closed, opening open and close valve under the situation big by the above-mentioned lower limit rotating speed of the detected rotating ratio of above-mentioned revolution detector, is being that open and close valve is closed in situation ShiShimonoseki below the above-mentioned lower limit rotating speed by the detected rotating speed of above-mentioned revolution detector.
3. compressor as claimed in claim 1 or 2 is characterized in that, above-mentioned control gear drives said motor when opening above-mentioned open and close valve, stop said motor when closing above-mentioned open and close valve.
4. compressor as claimed in claim 1 or 2 is characterized in that, above-mentioned compressor is the compressor of oil injection type.
5. the method for operation of a compressor, this compressor comprises:
Compressor main body,
Pressure detector is arranged on the discharge side of above-mentioned compressor main body, can carry out Pressure testing,
Control gear, based on the pressure signal of expression from the detected pressures of above-mentioned pressure detector, output is used to control the control signal of the rotating speed of above-mentioned compressor main body drive motor,
In above-mentioned method of operation,
Suction side in the above-mentioned compressor main body is provided with open and close valve,
In above-mentioned control gear, set the lower limit rotating speed of said motor, roughly the same to the gas flow that the discharge thruster of above-mentioned compressor main body goes out under this lower limit rotating speed with the gas flow that leaks to the suction side,
In above-mentioned control gear, more than above-mentioned lower limit rotating speed and in the scope below the maximum speed of motor, determine the control rotating speed, this control rotating speed is used to eliminate the deviation of above-mentioned detected pressures with respect to predefined goal pressure,
Opening above-mentioned open and close valve under the big situation of the above-mentioned lower limit rotating speed of above-mentioned control rotating ratio, is that situation ShiShimonoseki below the above-mentioned lower limit rotating speed is closed and stated open and close valve at above-mentioned control rotating speed.
6. the method for operation of a compressor, this compressor comprises:
Compressor main body,
Pressure detector is arranged on the discharge side of above-mentioned compressor main body, can carry out Pressure testing,
Revolution detector detects the rotating speed of the motor that drives the above-mentioned compressor main body,
Control gear, based on the pressure signal of expression from the detected pressures of above-mentioned pressure detector, output is used to control the control signal of the rotating speed of above-mentioned compressor main body drive motor,
In above-mentioned method of operation,
Suction side in the above-mentioned compressor main body is provided with open and close valve,
In above-mentioned control gear, set the lower limit rotating speed of said motor, roughly the same to the gas flow that the discharge thruster of above-mentioned compressor main body goes out under this lower limit rotating speed with the gas flow that leaks to the suction side,
Be used to eliminate the control signal of above-mentioned detected pressures from above-mentioned control gear output with respect to the deviation of predefined goal pressure, at the rotating speed of the scope inner control said motor more than the above-mentioned lower limit rotating speed and below the maximum speed of motor, and,
Opening above-mentioned open and close valve under the situation big by the above-mentioned lower limit rotating speed of the detected rotating ratio of above-mentioned revolution detector, is being that situation ShiShimonoseki below the above-mentioned lower limit rotating speed is closed and stated open and close valve by the detected rotating speed of above-mentioned revolution detector.
7. as the method for operation of claim 5 or 6 described compressors, it is characterized in that above-mentioned control gear drives said motor when opening above-mentioned open and close valve, stop said motor when closing above-mentioned open and close valve.
8. as the method for operation of claim 5 or 6 described compressors, it is characterized in that above-mentioned compressor is the compressor of oil injection type.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007002269 | 2007-01-10 | ||
| JP2007002269A JP4795977B2 (en) | 2007-01-10 | 2007-01-10 | Compressor operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101220813A CN101220813A (en) | 2008-07-16 |
| CN100585185C true CN100585185C (en) | 2010-01-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810003045A Active CN100585185C (en) | 2007-01-10 | 2008-01-10 | Compressor and operation method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4795977B2 (en) |
| CN (1) | CN100585185C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4947174B2 (en) * | 2010-03-18 | 2012-06-06 | ダイキン工業株式会社 | Single screw compressor |
| TWI400415B (en) * | 2010-12-17 | 2013-07-01 | Ind Tech Res Inst | Controlling method of changeable capacity and changeable discharge pressure of a variable speed screw compressor |
| JP5878737B2 (en) * | 2011-11-17 | 2016-03-08 | 株式会社神戸製鋼所 | Compression device |
| WO2019186861A1 (en) * | 2018-03-29 | 2019-10-03 | 株式会社日立産機システム | Gas compressor |
-
2007
- 2007-01-10 JP JP2007002269A patent/JP4795977B2/en active Active
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- 2008-01-10 CN CN200810003045A patent/CN100585185C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP4795977B2 (en) | 2011-10-19 |
| CN101220813A (en) | 2008-07-16 |
| JP2008169723A (en) | 2008-07-24 |
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Effective date of registration: 20220217 Address after: Tokyo, Japan Patentee after: Shengang Compressor Co.,Ltd. Address before: Kobe City, Hyogo Prefecture, Japan Patentee before: Kobe Steel, Ltd. |