CN104806497A - Control method and control device of compressor - Google Patents
Control method and control device of compressor Download PDFInfo
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- CN104806497A CN104806497A CN201410033445.XA CN201410033445A CN104806497A CN 104806497 A CN104806497 A CN 104806497A CN 201410033445 A CN201410033445 A CN 201410033445A CN 104806497 A CN104806497 A CN 104806497A
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Abstract
The invention provides a control method of a compressor. The control method comprises the following steps: S1, respectively setting a preset upper limit current value and preset time delay time of the compressor corresponding to a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve; S2, respectively setting the corresponding continuous operating time of the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve; S3, respectively setting a polarized loading and unloading pulse signal and a non-polar loading and unloading pulse signal; S4, setting the circulating times of loading and unloading; S5, setting the operating modes of a manual controller, wherein the operating modes of the manual controller respectively comprises a current judgment mode, a time judgment mode, a polarized loading and unloading judgment mode and a non-polar loading and unloading judgment mode. The invention further relates to a control device. According to the control method of the compressor and the control device provided by the invention, the compressor can be loaded and unloaded according to the operating current or continuous operating time in a corresponding output load section, and an aim of testing the loading and unloading of an automatic control compressor of the system can be realized.
Description
Technical field
The present invention relates to compressor test field, particularly relate to a kind of controlling method and control gear of compressor.
Background technique
In the development and testing and complete machine checking compressor performance project of compressor, often need by artificially observing the power numeral output on control cabinet and the test data curve on computer, carry out more than artificial hundred times repetition period property and motion action is carried out to display screen, go to realize compressor 25%, uninstall action reliability testing object is added after the power on/off of corresponding four solenoid valves of 50%, 75%, 100% load section, a waste of time and manpower, with the addition of workload.
Summary of the invention
In view of the present situation of prior art, the object of the present invention is to provide a kind of controlling method and control gear of compressor, the system automatic control compressor of realization adds unloading test purpose.For achieving the above object, technological scheme of the present invention is as follows:
A kind of controlling method of compressor, described compressor is divided into 25%, 50%, 75% and 100% 4 output load section, wherein 25% output load section is by the first electromagnetic valve, 50% output load section is by the second electromagnetic valve, 75% output load Duan You tri-electromagnetic valve, 100% load Duan You tetra-electromagnetic valve, comprises the following steps:
S1, sets the preset upper limit current value of described compressor corresponding to described first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve and default delay time respectively;
S2, sets the continuous working period that described first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve are corresponding respectively;
S3, is set with pole respectively and adds unloading pulse signal and electrodelessly add unloading pulse signal, described in have pole to add unloading pulse signal to include pole load pulses and have pole off-load pulse, the described electrodeless unloading pulse signal that adds comprises electrodeless load pulses and electrodeless off-load pulse;
S4, setting adds the cycle-index of unloading;
S5, the mode of operation of setting manual operating device, the mode of operation of described manual operating device has four kinds, is respectively electric current determinating mode, time determinating mode, has pole add unloading mode and electrodelessly add unloading mode.
More preferably, when selecting " electric current determinating mode "+" having pole to add unloading mode ":
After energising, described have pole to add unloading pulse signal first to described first solenoid valve, described first electromagnetic valve work, when the current value of the described compressor detected reaches the described preset upper limit current value of 25% output load section, delay time is preset described in time delay, described have pole to add unloading pulse signal to described second solenoid valve, described second electromagnetic valve work, described first closed electromagnetic valve; When the current value of the described compressor detected reaches the described preset upper limit current value of 50% output load section, delay time is preset described in time delay, described have pole to add unloading pulse signal to described 3rd solenoid valve, described 3rd electromagnetic valve work, described second closed electromagnetic valve; When the current value of the described compressor detected reaches the described preset upper limit current value of 75% output load section, delay time is preset described in time delay, described have pole to add unloading pulse signal to described 4th solenoid valve, described 4th electromagnetic valve work, described 3rd closed electromagnetic valve; When the current value of the described compressor detected reaches the described preset upper limit current value of 100% output load section, described in time delay preset delay time, described in have pole add unloading pulse signal give described first solenoid valve, described first electromagnetic valve work, described 4th closed electromagnetic valve, so circulates.
More preferably, when selecting " electric current determinating mode "+" electrodeless add unloading mode ":
After energising, the described electrodeless unloading pulse signal that adds is first to described first solenoid valve, described first electromagnetic valve work, when the current value of the described compressor detected reaches the described preset upper limit current value of 25% output load section, delay time is preset described in time delay, the described electrodeless unloading pulse signal that adds is to described 4th solenoid valve, described 4th electromagnetic valve work, described first closed electromagnetic valve, when the current value of the described compressor detected reaches the described preset upper limit current value of 100% output load section, delay time is preset described in time delay, the described electrodeless unloading pulse signal that adds is to described first solenoid valve, described first electromagnetic valve work, described 4th closed electromagnetic valve, circulation like this.
More preferably, when selecting " time determinating mode "+" having pole to add unloading mode ":
After energising, described have pole to add unloading pulse signal first to described first solenoid valve, described first electromagnetic valve work, when described compressor is after the continuous working period of 25% output load section reaches set time, described have pole to add unloading pulse signal to described second solenoid valve, described second electromagnetic valve work, described first closed electromagnetic valve, when described compressor is after the continuous working period of 50% output load section reaches set time, described have pole to add unloading pulse signal to described 3rd solenoid valve, described 3rd electromagnetic valve work, described second closed electromagnetic valve, when described compressor is after the continuous working period of 75% output load section reaches set time, described have pole to add unloading pulse signal to described 4th solenoid valve, described 4th electromagnetic valve work, described 3rd closed electromagnetic valve, when described compressor is after the continuous working period of 100% output load section reaches set time, described have pole to add unloading pulse signal to described first solenoid valve, described first electromagnetic valve work, described 4th closed electromagnetic valve, circulation like this.
More preferably, when selecting " time determinating mode "+" electrodeless add unloading mode ":
After energising, the described electrodeless unloading pulse signal that adds is first to described first solenoid valve, described first electromagnetic valve work, when described compressor is after the continuous working period of 25% output load section reaches set time, the described electrodeless unloading pulse signal that adds is to described 4th solenoid valve, described 4th electromagnetic valve work, described first closed electromagnetic valve; When described compressor is after the continuous working period of 100% output load section reaches set time, the described electrodeless unloading pulse signal that adds is to described first solenoid valve, described first electromagnetic valve work, described 4th closed electromagnetic valve, when described compressor is after the continuous working period of 25% output load section reaches set time, described electrodeless adding, unloads pulse signal to described 4th solenoid valve, described 4th electromagnetic valve work, described first closed electromagnetic valve, so circulates.
More preferably, the cycle-index adding unloading described in is 50-200 time.
Also relate to a kind of control gear, apply the controlling method of above-mentioned arbitrary technological scheme, described control gear comprises controller, Executive Module and current sensing means, and described controller is electrically connected with described Executive Module and described current sensing means respectively;
Described Executive Module is electrically connected with described first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve respectively, and described Executive Module is used for the opening and closing controlling described first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve according to the instruction of described controller; Described current sensing means is for detecting the operating current of described compressor.
More preferably, described controller comprises main control unit, current comparator and timer, and described Executive Module comprises pulse oscillator;
Described main control unit is electrically connected with described current comparator and described timer respectively, and the current value that described current comparator is used for transmitting according to described current sensing means compares to described preset upper limit current value corresponding to corresponding output load section that be compressed in and comparative result is transferred to described main control unit; Described timer is used for timing; Described pulse oscillator has pole add unloading pulse signal and describedly electrodelessly add unloading pulse signal for generation of described.
The invention has the beneficial effects as follows:
The controlling method of compressor of the present invention and control gear, according to the operating current of compressor in the output load section of correspondence or continuous working period, unloading is added to compressor, the system automatic control compressor of realization adds unloading test purpose, avoid artificially repeatedly operating frequently in compressor and system test, utilize manual operating device communication control function, and the periodic characteristics in daily compressor test, definition relevant communication parameter, and add determinating mode, switched by pattern, coordinate between two, when reaching a certain setting value, system judges automatically, give instruction action, realize unmanned and can frequently add uninstall action test to compressor.
Accompanying drawing explanation
Fig. 1 is the block diagram of control gear one embodiment of the present invention;
Fig. 2 is the schematic diagram after control gear of the present invention connects power supply.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearly understand, below in conjunction with drawings and Examples, the controlling method of compressor of the present invention and control gear are further elaborated.Should be appreciated that specific embodiment described herein only for explaining the present invention, being not intended to limit the present invention.
Referring to figs. 1 through Fig. 2, control gear one embodiment of the present invention is used for the test of compressor, compressor is divided into 25%, 50%, 75% and 100% 4 output load section, wherein 25% output load section is by the first electromagnetic valve, 50% output load section is by the second electromagnetic valve, 75% output load Duan You tri-electromagnetic valve, 100% load Duan You tetra-electromagnetic valve, control gear comprises controller, Executive Module and current sensing means, controller is electrically connected with Executive Module and current sensing means respectively, the man-machine interaction of controller is realized by manual operating device, Executive Module respectively with the first solenoid valve, second solenoid valve, 3rd solenoid valve and the electrical connection of the 4th solenoid valve, Executive Module is used for controlling the first solenoid valve according to the instruction of controller, second solenoid valve, the opening and closing of the 3rd solenoid valve and the 4th solenoid valve, current sensing means is for detecting the operating current of described compressor.Preferably, the first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve are impulse electromagnetic valve.
Wherein, controller comprises main control unit, current comparator and timer, Executive Module comprises pulse oscillator, main control unit is electrically connected with current comparator and timer respectively, current comparator is used for the preset upper limit current value corresponding to being compressed in corresponding output load section according to the current value of current sensing means transmission and compares and comparative result is transferred to main control unit, timer is used for timing, and pulse oscillator adds unloading pulse signal for generation of there being pole and electrodelessly adding unloading pulse signal.
Above-mentioned compressor is in test process, and controlling method comprises the following steps:
S1, sets the preset upper limit current value of described compressor corresponding to the first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve and default delay time respectively;
S2, sets the continuous working period that the first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve are corresponding respectively;
S3, is set with pole respectively and adds unloading pulse signal and electrodelessly add unloading pulse signal, has pole to add unloading pulse signal and includes pole load pulses and have pole off-load pulse, and the electrodeless unloading pulse signal that adds comprises electrodeless load pulses and electrodeless off-load pulse;
S4, setting adds the cycle-index of unloading;
S5, the mode of operation of setting manual operating device, the mode of operation of manual operating device has four kinds, be respectively electric current determinating mode, time determinating mode, have pole add unloading mode and electrodelessly add unloading mode, wherein, the electrodeless unloading mode that adds only has the first solenoid valve and the 4th solenoid valve action in turn, and has pole to add the first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve do action successively under unloading mode.
In above-mentioned control procedure, unloading can be added according to the operating current of compressor in the output load section of correspondence or continuous working period to compressor.
According to the operating current of compressor in the output load section of correspondence, unloading is added to compressor, is specially:
Select " electric current determinating mode "+" having pole to add unloading mode ", after energising, pole is had to add unloading pulse signal first to the first solenoid valve, first electromagnetic valve work, when the current value of the compressor detected reaches the preset upper limit current value of 25% output load section, delay time is preset in time delay, has pole to add unloading pulse signal to the second solenoid valve, second electromagnetic valve work, the first closed electromagnetic valve; When the current value of the compressor detected reaches the preset upper limit current value of 50% output load section, delay time is preset in time delay, has pole to add unloading pulse signal to the 3rd solenoid valve, the 3rd electromagnetic valve work, the second closed electromagnetic valve; When the current value of the compressor detected reaches the preset upper limit current value of 75% output load section, delay time is preset in time delay, has pole to add unloading pulse signal to the 4th solenoid valve, the 4th electromagnetic valve work, the 3rd closed electromagnetic valve; When the current value of the compressor detected reaches the preset upper limit current value of 100% output load section, delay time is preset in time delay, and have pole to add unloading pulse signal to the first solenoid valve, the first electromagnetic valve work, described 4th closed electromagnetic valve, so circulates.
Or, select " electric current determinating mode "+" electrodeless add unloading mode ", after energising, the electrodeless unloading pulse signal that adds is first to the first solenoid valve, first electromagnetic valve work, when the current value of the compressor detected reaches the preset upper limit current value of 25% output load section, delay time is preset in time delay, the electrodeless unloading pulse signal that adds is to the 4th solenoid valve, 4th electromagnetic valve work, first closed electromagnetic valve, when the current value of the compressor detected reaches the preset upper limit current value of 100% output load section, delay time is preset in time delay, the electrodeless unloading pulse signal that adds is to the first solenoid valve, first electromagnetic valve work, 4th closed electromagnetic valve, circulation like this.The cycle-index adding unloading is 50-200 time, preferably 100 times.
According to the continuous working period of compressor in the output load section of correspondence, unloading is added to compressor, is specially:
Select " time determinating mode "+" having pole to add unloading mode ", after energising, pole is had to add unloading pulse signal first to the first solenoid valve, first electromagnetic valve work, when compressor is after the continuous working period of 25% output load section reaches set time, pole is had to add unloading pulse signal to the second solenoid valve, the second electromagnetic valve work, the first closed electromagnetic valve, when compressor is after the continuous working period of 50% output load section reaches set time, pole is had to add unloading pulse signal to the 3rd solenoid valve, 3rd electromagnetic valve work, second closed electromagnetic valve, when compressor is after the continuous working period of 75% output load section reaches set time, pole is had to add unloading pulse signal to the 4th solenoid valve, 4th electromagnetic valve work, 3rd closed electromagnetic valve, when compressor is after the continuous working period of 100% output load section reaches set time, pole is had to add unloading pulse signal to the first solenoid valve, first electromagnetic valve work, 4th closed electromagnetic valve, circulation like this.The cycle-index adding unloading is 50-200 time, preferably 100 times.
Or, select " time determinating mode "+" electrodeless add unloading mode ", after energising, the electrodeless unloading pulse signal that adds is first to the first solenoid valve, first electromagnetic valve work, when compressor is after the continuous working period of 25% output load section reaches set time, the electrodeless unloading pulse signal that adds is to the 4th solenoid valve, 4th electromagnetic valve work, the first closed electromagnetic valve; When compressor is after the continuous working period of 100% output load section reaches set time, the electrodeless unloading pulse signal that adds is to the first solenoid valve, first electromagnetic valve work, 4th closed electromagnetic valve, when compressor is after the continuous working period of 25% output load section reaches set time, electrodeless adding, unloads pulse signal to the 4th solenoid valve, the 4th electromagnetic valve work, first closed electromagnetic valve, so circulates.The cycle-index adding unloading is 50-200 time, preferably 100 times.
The controlling method of the compressor of above embodiment and control gear, according to the operating current of compressor in the output load section of correspondence or continuous working period, unloading is added to compressor, the system that realizes controls to add unloading test purpose automatically, avoid artificially repeatedly operating frequently in compressor and system test, utilize the periodic characteristics in manual operating device communication control function and daily compressor test, definition relevant communication parameter, and add determinating mode, switched by pattern, coordinate between two, when reaching a certain setting value, system judges automatically, give instruction action, realize unmanned and can frequently add uninstall action test to compressor.
The above embodiment only have expressed several mode of execution of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. the controlling method of a compressor, described compressor is divided into 25%, 50%, 75% and 100% 4 output load section, wherein 25% output load section is by the first electromagnetic valve, 50% output load section is by the second electromagnetic valve, 75% output load Duan You tri-electromagnetic valve, 100% load Duan You tetra-electromagnetic valve, is characterized in that, comprise the following steps:
S1, sets the preset upper limit current value of described compressor corresponding to described first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve and default delay time respectively;
S2, sets the continuous working period that described first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve are corresponding respectively;
S3, is set with pole respectively and adds unloading pulse signal and electrodelessly add unloading pulse signal, described in have pole to add unloading pulse signal to include pole load pulses and have pole off-load pulse, the described electrodeless unloading pulse signal that adds comprises electrodeless load pulses and electrodeless off-load pulse;
S4, setting adds the cycle-index of unloading;
S5, the mode of operation of setting manual operating device, the mode of operation of described manual operating device has four kinds, is respectively electric current determinating mode, time determinating mode, has pole add unloading mode and electrodelessly add unloading mode.
2. the controlling method of compressor according to claim 1, is characterized in that:
When selecting " electric current determinating mode "+" having pole to add unloading mode ":
After energising, described have pole to add unloading pulse signal first to described first solenoid valve, described first electromagnetic valve work, when the current value of the described compressor detected reaches the described preset upper limit current value of 25% output load section, delay time is preset described in time delay, described have pole to add unloading pulse signal to described second solenoid valve, described second electromagnetic valve work, described first closed electromagnetic valve; When the current value of the described compressor detected reaches the described preset upper limit current value of 50% output load section, delay time is preset described in time delay, described have pole to add unloading pulse signal to described 3rd solenoid valve, described 3rd electromagnetic valve work, described second closed electromagnetic valve; When the current value of the described compressor detected reaches the described preset upper limit current value of 75% output load section, delay time is preset described in time delay, described have pole to add unloading pulse signal to described 4th solenoid valve, described 4th electromagnetic valve work, described 3rd closed electromagnetic valve; When the current value of the described compressor detected reaches the described preset upper limit current value of 100% output load section, described in time delay preset delay time, described in have pole add unloading pulse signal give described first solenoid valve, described first electromagnetic valve work, described 4th closed electromagnetic valve, so circulates.
3. the controlling method of compressor according to claim 1, is characterized in that:
Select " electric current determinating mode "+" electrodeless add unloading mode " time:
After energising, the described electrodeless unloading pulse signal that adds is first to described first solenoid valve, described first electromagnetic valve work, when the current value of the described compressor detected reaches the described preset upper limit current value of 25% output load section, delay time is preset described in time delay, the described electrodeless unloading pulse signal that adds is to described 4th solenoid valve, described 4th electromagnetic valve work, described first closed electromagnetic valve, when the current value of the described compressor detected reaches the described preset upper limit current value of 100% output load section, delay time is preset described in time delay, the described electrodeless unloading pulse signal that adds is to described first solenoid valve, described first electromagnetic valve work, described 4th closed electromagnetic valve, circulation like this.
4. the controlling method of compressor according to claim 1, is characterized in that:
When selecting " time determinating mode "+" having pole to add unloading mode ":
After energising, described have pole to add unloading pulse signal first to described first solenoid valve, described first electromagnetic valve work, when described compressor is after the continuous working period of 25% output load section reaches set time, described have pole to add unloading pulse signal to described second solenoid valve, described second electromagnetic valve work, described first closed electromagnetic valve, when described compressor is after the continuous working period of 50% output load section reaches set time, described have pole to add unloading pulse signal to described 3rd solenoid valve, described 3rd electromagnetic valve work, described second closed electromagnetic valve, when described compressor is after the continuous working period of 75% output load section reaches set time, described have pole to add unloading pulse signal to described 4th solenoid valve, described 4th electromagnetic valve work, described 3rd closed electromagnetic valve, when described compressor is after the continuous working period of 100% output load section reaches set time, described have pole to add unloading pulse signal to described first solenoid valve, described first electromagnetic valve work, described 4th closed electromagnetic valve, circulation like this.
5. the controlling method of compressor according to claim 1, is characterized in that:
Select " time determinating mode "+" electrodeless add unloading mode " time:
After energising, the described electrodeless unloading pulse signal that adds is first to described first solenoid valve, described first electromagnetic valve work, when described compressor is after the continuous working period of 25% output load section reaches set time, the described electrodeless unloading pulse signal that adds is to described 4th solenoid valve, described 4th electromagnetic valve work, described first closed electromagnetic valve; When described compressor is after the continuous working period of 100% output load section reaches set time, the described electrodeless unloading pulse signal that adds is to described first solenoid valve, described first electromagnetic valve work, described 4th closed electromagnetic valve, when described compressor is after the continuous working period of 25% output load section reaches set time, described electrodeless adding, unloads pulse signal to described 4th solenoid valve, described 4th electromagnetic valve work, described first closed electromagnetic valve, so circulates.
6. the controlling method of the compressor according to any one of claim 2-5, is characterized in that:
The described cycle-index adding unloading is 50-200 time.
7. a control gear, application rights requires the controlling method of the compressor described in any one of 1-6, it is characterized in that:
Comprise controller, Executive Module and current sensing means, described controller is electrically connected with described Executive Module and described current sensing means respectively;
Described Executive Module is electrically connected with described first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve respectively, and described Executive Module is used for the opening and closing controlling described first solenoid valve, the second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve according to the instruction of described controller; Described current sensing means is for detecting the operating current of described compressor.
8. control gear according to claim 7, is characterized in that:
Described controller comprises main control unit, current comparator and timer, and described Executive Module comprises pulse oscillator;
Described main control unit is electrically connected with described current comparator and described timer respectively, and the current value that described current comparator is used for transmitting according to described current sensing means compares to described preset upper limit current value corresponding to corresponding output load section that be compressed in and comparative result is transferred to described main control unit; Described timer is used for timing; Described pulse oscillator has pole add unloading pulse signal and describedly electrodelessly add unloading pulse signal for generation of described.
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| CN201410033445.XA CN104806497B (en) | 2014-01-23 | 2014-01-23 | The control method of compressor and control device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572946A (en) * | 1980-06-09 | 1982-01-08 | Sanyo Electric Co Ltd | Heat pump type air conditioning apparatus |
| US4412788A (en) * | 1981-04-20 | 1983-11-01 | Durham-Bush, Inc. | Control system for screw compressor |
| EP0353520A2 (en) * | 1988-07-26 | 1990-02-07 | Kabushiki Kaisha Toshiba | Method of and apparatus for detecting shaft position of compressor for air conditioner, and control apparatus for stopping air compressor by using shaft position detecting apparatus |
| JPH0932806A (en) * | 1995-07-24 | 1997-02-04 | Ooyodo Diesel Kk | Energy saving operation diagnosis for motor-driven air compressor and energy saving operation diagnosis device |
| CN201896732U (en) * | 2010-11-16 | 2011-07-13 | 潍柴动力股份有限公司 | Load increasing and reducing device of air compressor |
-
2014
- 2014-01-23 CN CN201410033445.XA patent/CN104806497B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572946A (en) * | 1980-06-09 | 1982-01-08 | Sanyo Electric Co Ltd | Heat pump type air conditioning apparatus |
| US4412788A (en) * | 1981-04-20 | 1983-11-01 | Durham-Bush, Inc. | Control system for screw compressor |
| EP0353520A2 (en) * | 1988-07-26 | 1990-02-07 | Kabushiki Kaisha Toshiba | Method of and apparatus for detecting shaft position of compressor for air conditioner, and control apparatus for stopping air compressor by using shaft position detecting apparatus |
| JPH0932806A (en) * | 1995-07-24 | 1997-02-04 | Ooyodo Diesel Kk | Energy saving operation diagnosis for motor-driven air compressor and energy saving operation diagnosis device |
| CN201896732U (en) * | 2010-11-16 | 2011-07-13 | 潍柴动力股份有限公司 | Load increasing and reducing device of air compressor |
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