CN105927522A - Oil return control method and system of speed regulating system of compressor - Google Patents
Oil return control method and system of speed regulating system of compressor Download PDFInfo
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- CN105927522A CN105927522A CN201610385884.6A CN201610385884A CN105927522A CN 105927522 A CN105927522 A CN 105927522A CN 201610385884 A CN201610385884 A CN 201610385884A CN 105927522 A CN105927522 A CN 105927522A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
Abstract
The invention provides an oil return control method and system of a speed regulating system of a compressor. The method comprises the following steps: judging whether a rotating speed value/a frequency value of the compressor within a first time satisfies a first predetermined condition or not by acquiring the rotating speed value/the frequency value of the compressor within the first time; if so, judging whether the rotating speed value/the frequency value of the compressor within the first time satisfies a second predetermined condition or not; and if so, forcing the compressor to operate for a second time at the maximum rotating speed, so as to effectively control oil return of the speed regulating system of the compressor, and avoid damages on the compressor due to insufficient oil return. Furthermore, the method and the system provided by the invention can be realized only by increasing a section of control logic in a controller of the speed regulating system of the compressor and a corresponding data acquisition module, so that the method and system are easy to implement.
Description
Technical field
The present invention relates to refrigeration control technology, the method for controlling oil return of a kind of compressor governing system and system thereof.
Background technology
In the actual operation of data center module, the IT of machine room load is substantially in batches, the most added, a lot of machine rooms run to remain in for many years and apply under relatively low-load, and the refrigerating capacity of air conditioner in machine room is superfluous；Compressor fall-back, reduces air conditioner refrigerating amount and is allowed to match with load, is one of the energy saving means of machine room.
Compressor fall-back, causes refrigerant mass fluxes and pressure to decline, and the ability of the taken away lubricating oil of gaseous coolant will drastically decline.Under the operating mode of high drop condensing tube, compressor lubricant oil cannot meet normal circulation, and compressor lubricant oil may be caused to be accumulated in exhaustor, it is impossible to normal return compressor oil sump, there is the phenomenon that compressor oil sump lubricating oil is not enough.
In existing technology, after compressor fall-back, or do not account for the importance of oil return, there is the risk that compressor damages because oil return is not enough；It is from hardware, on the suction trachea of compressor, increase bypass pipe, makes compressor lubricant oil be returned to oil sump, but the method high cost, and in old air-conditioning upgrade, it is difficult to construction.
Therefore, prior art awaits further improving.
Summary of the invention
In view of above-mentioned weak point of the prior art, it is an object of the invention to provide the user method for controlling oil return and the system thereof of a kind of compressor governing system, overcome in prior art and compressor oil return is not controlled, because oil return is not enough, cause compressor damage, or use relatively costly and being difficult to is constructed the defect of method for controlling oil return.
It is as follows that the present invention solves the technical scheme that technical problem used:
A kind of method for controlling oil return of compressor governing system, wherein, including:
A, the tachometer value/frequency values of collection very first time inner compressor；
B, to judge within the very first time whether tachometer value/the frequency values of described compressor meets first pre-conditioned, if meeting, then performs step D, otherwise performs step C；
C, to judge within the very first time whether tachometer value/the frequency values of described compressor meets second pre-conditioned, if meeting, then returns step A, otherwise performs step D；
D, pressure compressor operated for the second time with maximum (top) speed.
The method for controlling oil return of described compressor governing system, wherein, including:
Include in the described very first time: the first timing time, the second timing time, the 3rd timing time, the 4th timing time；
Described first timing time is when the tachometer value/frequency values of described compressor is less than the time of the first predetermined threshold；
Described second timing time is when the tachometer value/frequency values of described compressor is in the time between the first predetermined threshold and the second predetermined threshold；
Described 3rd timing time is when the tachometer value/frequency values of described compressor is in the time between the second predetermined threshold and the 3rd predetermined threshold；
Described 4th timing time is when the tachometer value/frequency values of described compressor is in the time between the 3rd predetermined threshold and the 4th predetermined threshold；
Described first pre-conditioned is: after the first timing time, the second timing time, the 3rd timing time and the 4th time weight calculate, and calculation result data is less than predetermined number.
The method for controlling oil return of described compressor governing system, wherein, including:
Also include in the described very first time: the 5th timing time；
Described 5th timing time is when the tachometer value/frequency values of described compressor is higher than the time of the 4th predetermined threshold；
Described second pre-conditioned is, described 5th timing time is more than predetermined timing time.
The method for controlling oil return of described compressor governing system, wherein, including:
Described first predetermined threshold is the data of 75% rated speed/rated frequency；
Described two predetermined thresholds are the data of 83% rated speed/rated frequency；
Described 3rd predetermined threshold is the data of 90% rated speed/rated frequency；
Described 4th predetermined threshold is the data of 95% rated speed/rated frequency.
The method for controlling oil return of described compressor governing system, wherein, described first pre-conditioned weighted calculation formula is:
T=t1/30+t2/40+t3/50+t4/60；
Above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and the 4th timing time；T is the calculation result data of above-mentioned weighted calculation formula；
Described predetermined number is 1；
Described predetermined timing time is 3 minutes；
Described first Preset Time in the range of: 90 minutes-120 minutes；Described second Preset Time is 3 minutes.
A kind of oil return control system of compressor governing system, wherein, including:
Data acquisition module, for gathering the tachometer value/frequency values of very first time inner compressor；
First judge module, pre-conditioned for judging within the very first time whether tachometer value/the frequency values of described compressor meets first；
Second judge module, for when the tachometer value/frequency values of compressor described in the very first time be unsatisfactory for first pre-conditioned time, it is judged that within the very first time, whether to meet second pre-conditioned for the tachometer value/frequency values of described compressor；
Control oil return module, be used for forcing compressor to preset for the second time with maximum (top) speed operating.
The oil return control system of described compressor governing system, wherein, including:
Include in the described very first time: the first timing time, the second timing time, the 3rd timing time, the 4th timing time；
Described first timing time is when the tachometer value/frequency values of described compressor is less than the time of the first predetermined threshold；
Described second timing time is when the tachometer value/frequency values of described compressor is in the time between the first predetermined threshold and the second predetermined threshold；
Described 3rd timing time is when the tachometer value/frequency values of described compressor is in the time between the second predetermined threshold and the 3rd predetermined threshold；
Described 4th timing time is when the tachometer value/frequency values of described compressor is in the time between the 3rd predetermined threshold and the 4th predetermined threshold；
Described first pre-conditioned is: after the first timing time, the second timing time, the 3rd timing time and the 4th time weight calculate, and calculation result data is less than predetermined number.
The oil return control system of described compressor governing system, wherein, including:
Also include in the described very first time: the 5th timing time；
Described 5th timing time is when the tachometer value/frequency values of described compressor is higher than the time of the 4th predetermined threshold；
Described second pre-conditioned is, described 5th timing time is more than predetermined timing time.
The oil return control system of described compressor governing system, wherein, including:
Described first predetermined threshold is the data of 75% rated speed/rated frequency；
Described two predetermined thresholds are the data of 83% rated speed/rated frequency；
Described 3rd predetermined threshold is the data of 90% rated speed/rated frequency；
Described 4th predetermined threshold is the data of 95% rated speed/rated frequency.
The oil return control system of described compressor governing system, wherein, including:
Described first pre-conditioned weighted calculation formula is:
T=t1/30+t2/40+t3/50+t4/60；
Above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and the 4th timing time；T is the calculation result data of above-mentioned weighted calculation formula；
Described predetermined number is 1；
Described predetermined timing time is 3 minutes；
Described first Preset Time in the range of: 90 minutes-120 minutes；Described second time is 3 minutes.
Beneficial effect, the invention provides method for controlling oil return and the system thereof of a kind of compressor governing system, by gathering the tachometer value/frequency values of very first time inner compressor；Judge within the very first time whether tachometer value/the frequency values of described compressor meets first pre-conditioned, if meeting, otherwise judge within the very first time whether tachometer value/the frequency values of described compressor meets second pre-conditioned, if meeting, compressor is then forced to operate for the second time with maximum (top) speed, thus realize the effective control to compressor governing system oil return, avoid because of the not enough damage to it of oil return, and method provided by the present invention and system thereof, only by increasing one-stage control logic in the controller of compressor governing system, and data acquisition module just can realize accordingly, it is thus susceptible to implement.
Accompanying drawing explanation
Fig. 1 is the flow chart of the preferred embodiment of the method for controlling oil return of a kind of compressor governing system of the present invention；
Fig. 2 is the flow chart of steps of the method for the invention specific embodiment；
Fig. 3 is the theory structure schematic diagram of the oil return control system of a kind of compressor governing system of the present invention.
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.Should be appreciated that specific embodiment described herein is used only for explaining the present invention, be not intended to limit the present invention.
The invention provides the method for controlling oil return of a kind of compressor governing system, as it is shown in figure 1, described method includes:
S1, the tachometer value/frequency values of collection very first time inner compressor.
This method is timed first by intervalometer, gathers tachometer value or the frequency values of a period of time inner compressor, according to described tachometer value and frequency values, the oil return of this compressor is controlled.
Concrete, in order to preferably according to running statuses different residing for compressor, carry out corresponding oil return control, in this step, within the very first time, it is provided with five different time periods, is respectively as follows: the first timing time, the second timing time, the 3rd timing time, the 4th timing time and the 5th timing time.
Described first timing time is when the tachometer value/frequency values of described compressor is less than the time of the first predetermined threshold；
Described second timing time is when the tachometer value/frequency values of described compressor is in the time between the first predetermined threshold and the second predetermined threshold；
Described 3rd timing time is when the tachometer value/frequency values of described compressor is in the time between the second predetermined threshold and the 3rd predetermined threshold；
Described 4th timing time is when the tachometer value/frequency values of described compressor is in the time between the 3rd predetermined threshold and the 4th predetermined threshold；
Described first pre-conditioned is: after the first timing time, the second timing time, the 3rd timing time and the 4th time weight calculate, and calculation result data is less than predetermined number.
Described 5th timing time is when the tachometer value/frequency values of described compressor is higher than the time of the 4th predetermined threshold；
Described second pre-conditioned is, described 5th timing time is more than predetermined timing time.
Preferably, described first predetermined threshold is the data of 75% rated speed/rated frequency；Described two predetermined thresholds are the data of 83% rated speed/rated frequency；Described 3rd predetermined threshold is the data of 90% rated speed/rated frequency；Described 4th predetermined threshold is the data of 95% rated speed/rated frequency.
Start intervalometer and the scope collected residing for the rotating speed of compressor or frequency is carried out corresponding timing, thus by duration value corresponding to the rotating speed of different range collected or frequency.
S2, to judge within the very first time whether tachometer value/the frequency values of described compressor meets first pre-conditioned, if meeting, then performs step S4, otherwise performs step S3.
Whether this step, is analyzed the above-mentioned each timing time in the above-mentioned very first time, it is judged that meet first pre-conditioned at above-mentioned timing time, if meeting, triggering and controlling to force oil return.
Described first pre-conditioned weighted calculation formula is:
T=t1/30+t2/40+t3/50+t4/60；
Above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and the 4th timing time；T is the calculation result data of above-mentioned weighted calculation formula；
Described predetermined number is 1；That is to say when T >=1, if more than 1, then meet first pre-conditioned, perform step S4, otherwise perform step S3.
S3, to judge within the very first time whether tachometer value/the frequency values of described compressor meets second pre-conditioned, if meeting, then returns step S1, otherwise performs step S4.
Described second pre-conditioned be the 5th timing time whether more than predetermined timing time, if more than predetermined timing time, then judge to meet second pre-conditioned, perform step S4, otherwise return step S1, be defaulted as compressor and be made without oil return by force and control.
Preferably, described predetermined timing time is 3 minutes；That is to say, when described compressor continue to be in for 3 minutes rotating speed or frequency more than rated speed or frequency 95% time, then default compressor is made without forcing oil return to control, and otherwise performs step S4.
Preferably, described first Preset Time in the range of: 90 minutes-120 minutes；That is to say in step S1-step S3, tachometer value in the range of gathering 90 minutes-120 minutes or frequency values, and the tachometer value in this time or frequency values are judged, judge the scope corresponding to its present timing time respectively, and it is pre-conditioned and second pre-conditioned to determine whether to trigger first, if triggering, then perform step S4.
S4, pressure compressor operated for the second time with maximum (top) speed.
If in above-mentioned steps, tachometer value in first Preset Time or frequency values are triggered first pre-conditioned or second pre-conditioned, then control it under the compressor state with rated speed or rated frequency, run the 3rd Preset Time, preferably, described second Preset Time is 3 minutes.
Below as a example by the specific embodiment of method described above, described method is described further, as in figure 2 it is shown, specific embodiment comprises the following steps:
H1, by controller collect and process machine tachometer value N(or frequency values f),
H2, controller internal timer start the T1 that clocks, and unit is minute, T1 < during K, accumulation timing t1, t2, t3, t4, t5, wherein:
Accumulated time value, unit be minute t1: tachometer value N < rated speed × 75%(or frequency values f < rated frequency * 75%)；
T2: rated speed × 75% tachometer value N < rated speed * 83%(or rated frequency * 75% frequency values f
< rated frequency * 83%) accumulated time value, unit is minute；
T3: rated speed × 83% < tachometer value N rated speed * 90%(or rated frequency * 83% frequency values f < rated frequency * 90%) accumulated time value, unit is minute；
T4: rated speed × 90% < tachometer value N rated speed * 95%(or rated frequency * 90% frequency values f < rated frequency * 95%) accumulated time value, unit is minute；
Value continuous time of t5: tachometer value N > rated speed × 95%, unit is minute；
H3, in above-mentioned steps H2, obtain the time data of described t1, t2, t3 and t4 after, just the value of T=t1/30+t2/40+t3/50+t4/60 can be calculated, according to the value of the T calculated, it is judged that the size of T and 1, as T 1, start oil return to control, export control signal by controller, force compressor to operate with maximum (top) speed, i.e. rated speed operating, persistent period is T2, and after completing, all timer T1, t1, t2, t3, t4, t5 reset zero, re-start timing computing.
If H4 T is less than 1, then judging the value of t5, as t5 3, default compressor has completed oil return, and the most all timer T1, t1, t2, t3, t4, t5 reset zero, re-start timing computing.
If H5 is within the K time, condition in above-mentioned steps H3 and H5 is all unsatisfactory for, then when T1=K(is according to operation of air conditioner operating mode, the general value of K 90～120) time, start oil return logic, export control signal by controller, compressor is forced to operate with maximum (top) speed, persistent period is T2, and after completing, all timer T1, t1, t2, t3, t4, t5 reset zero, re-start timing computing.
The invention provides the solution that after a kind of compressor fall rotating speed runs, oil return controls, oil return operating mode can be made to combine with compressor actual motion frequency, starting compressor according to actual needs forces oil return to control, the harmful effect that the computer room temperature fluctuation that minimizing compressor rotary speed suddenlys change and causes increases；Additionally have also been made further safeguard procedures, in set time K, if being not reaching to the oil return time, then force start oil return logic.
Based on the above method, present invention also offers the oil return control system of a kind of compressor governing system, as it is shown on figure 3, described system includes:
Data acquisition module 110, for gathering the tachometer value/frequency values of very first time inner compressor；
First judge module 120, pre-conditioned for judging within the very first time whether tachometer value/the frequency values of described compressor meets first；
Second judge module 130, for when the tachometer value/frequency values of compressor described in the very first time be unsatisfactory for first pre-conditioned time, it is judged that within the very first time, whether to meet second pre-conditioned for the tachometer value/frequency values of described compressor；
Control oil return module 140, be used for forcing compressor to preset for the second time with maximum (top) speed operating.
The oil return control system of described compressor governing system, wherein, including:
Include in the described very first time: the first timing time, the second timing time, the 3rd timing time, the 4th timing time；
Described first timing time is when the tachometer value/frequency values of described compressor is less than the time of the first predetermined threshold；
Described second timing time is when the tachometer value/frequency values of described compressor is in the time between the first predetermined threshold and the second predetermined threshold；
Described 3rd timing time is when the tachometer value/frequency values of described compressor is in the time between the second predetermined threshold and the 3rd predetermined threshold；
Described 4th timing time is when the tachometer value/frequency values of described compressor is in the time between the 3rd predetermined threshold and the 4th predetermined threshold；
Described first pre-conditioned is: after the first timing time, the second timing time, the 3rd timing time and the 4th time weight calculate, and calculation result data is less than predetermined number.
The oil return control system of described compressor governing system, wherein, including:
Also include in the described very first time: the 5th timing time；
Described 5th timing time is when the tachometer value/frequency values of described compressor is higher than the time of the 4th predetermined threshold；
Described second pre-conditioned is, described 5th timing time is more than predetermined timing time.
The oil return control system of described compressor governing system, wherein, including:
Described first predetermined threshold is the data of 75% rated speed/rated frequency；
Described two predetermined thresholds are the data of 83% rated speed/rated frequency；
Described 3rd predetermined threshold is the data of 90% rated speed/rated frequency；
Described 4th predetermined threshold is the data of 95% rated speed/rated frequency.
The oil return control system of described compressor governing system, wherein, including:
Described first pre-conditioned weighted calculation formula is:
T=t1/30+t2/40+t3/50+t4/60；
Above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and the 4th timing time；T is the calculation result data of above-mentioned weighted calculation formula；
Described predetermined number is 1；
Described predetermined timing time is 3 minutes；
Described first Preset Time in the range of: 90 minutes-120 minutes；Described second time is 3 minutes.
The invention provides method for controlling oil return and the system thereof of a kind of compressor governing system, by gathering the tachometer value/frequency values of very first time inner compressor；Judge within the very first time whether tachometer value/the frequency values of described compressor meets first pre-conditioned, if meeting, otherwise judge within the very first time whether tachometer value/the frequency values of described compressor meets second pre-conditioned, if meeting, compressor is then forced to operate for the second time with maximum (top) speed, thus realize the effective control to compressor governing system oil return, avoid because of the not enough damage to it of oil return, and method provided by the present invention and system thereof, only by increasing one-stage control logic in the controller of compressor governing system, and data acquisition module just can realize accordingly, it is thus susceptible to implement.
It is understood that for those of ordinary skills, can be according to technical scheme and inventive concept thereof in addition equivalent or change, and all these change or replace the protection domain that all should belong to appended claims of the invention.
Claims (10)
1. the method for controlling oil return of a compressor governing system, it is characterised in that including:
A, the tachometer value/frequency values of collection very first time inner compressor；
B, to judge within the very first time whether tachometer value/the frequency values of described compressor meets first pre-conditioned, if meeting, then performs step D, otherwise performs step C；
C, to judge within the very first time whether tachometer value/the frequency values of described compressor meets second pre-conditioned, if meeting, then returns step A, otherwise performs step D；
D, pressure compressor operated for the second time with maximum (top) speed.
The method for controlling oil return of compressor governing system the most according to claim 1, it is characterised in that including:
Include in the described very first time: the first timing time, the second timing time, the 3rd timing time, the 4th timing time；
Described first timing time is when the tachometer value/frequency values of described compressor is less than the time of the first predetermined threshold；
Described second timing time is when the tachometer value/frequency values of described compressor is in the time between the first predetermined threshold and the second predetermined threshold；
Described 3rd timing time is when the tachometer value/frequency values of described compressor is in the time between the second predetermined threshold and the 3rd predetermined threshold；
Described 4th timing time is when the tachometer value/frequency values of described compressor is in the time between the 3rd predetermined threshold and the 4th predetermined threshold；
Described first pre-conditioned is: after the first timing time, the second timing time, the 3rd timing time and the 4th time weight calculate, and calculation result data is less than predetermined number.
The method for controlling oil return of compressor governing system the most according to claim 2, it is characterised in that including:
Also include in the described very first time: the 5th timing time；
Described 5th timing time is when the tachometer value/frequency values of described compressor is higher than the time of the 4th predetermined threshold；
Described second pre-conditioned is, described 5th timing time is more than predetermined timing time.
The method for controlling oil return of compressor governing system the most according to claim 2, it is characterised in that including:
Described first predetermined threshold is the data of 75% rated speed/rated frequency；
Described two predetermined thresholds are the data of 83% rated speed/rated frequency；
Described 3rd predetermined threshold is the data of 90% rated speed/rated frequency；
Described 4th predetermined threshold is the data of 95% rated speed/rated frequency.
5. according to the method for controlling oil return of compressor governing system described in claim 2 or 3, it is characterised in that described first pre-conditioned weighted calculation formula is:
T=t1/30+t2/40+t3/50+t4/60；
Above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and the 4th timing time；T is the calculation result data of above-mentioned weighted calculation formula；
Described predetermined number is 1；
Described predetermined timing time is 3 minutes；
Described first Preset Time in the range of: 90 minutes-120 minutes；Described second time is 3 minutes.
6. the oil return control system of a compressor governing system, it is characterised in that including:
Data acquisition module, for gathering the tachometer value/frequency values of very first time inner compressor；
First judge module, pre-conditioned for judging within the very first time whether tachometer value/the frequency values of described compressor meets first；
Second judge module, for when the tachometer value/frequency values of compressor described in the very first time be unsatisfactory for first pre-conditioned time, it is judged that within the very first time, whether to meet second pre-conditioned for the tachometer value/frequency values of described compressor；
Control oil return module, be used for forcing compressor to preset for the second time with maximum (top) speed operating.
The oil return control system of compressor governing system the most according to claim 6, it is characterised in that including:
Include in the described very first time: the first timing time, the second timing time, the 3rd timing time, the 4th timing time；
Described first timing time is when the tachometer value/frequency values of described compressor is less than the time of the first predetermined threshold；
Described second timing time is when the tachometer value/frequency values of described compressor is in the time between the first predetermined threshold and the second predetermined threshold；
Described 3rd timing time is when the tachometer value/frequency values of described compressor is in the time between the second predetermined threshold and the 3rd predetermined threshold；
Described 4th timing time is when the tachometer value/frequency values of described compressor is in the time between the 3rd predetermined threshold and the 4th predetermined threshold；
Described first pre-conditioned is: after the first timing time, the second timing time, the 3rd timing time and the 4th time weight calculate, and calculation result data is less than predetermined number.
The oil return control system of compressor governing system the most according to claim 7, it is characterised in that including:
Also include in the described very first time: the 5th timing time；
Described 5th timing time is when the tachometer value/frequency values of described compressor is higher than the time of the 4th predetermined threshold；
Described second pre-conditioned is, described 5th timing time is more than predetermined timing time.
The oil return control system of compressor governing system the most according to claim 7, it is characterised in that including:
Described first predetermined threshold is the data of 75% rated speed/rated frequency；
Described two predetermined thresholds are the data of 83% rated speed/rated frequency；
Described 3rd predetermined threshold is the data of 90% rated speed/rated frequency；
Described 4th predetermined threshold is the data of 95% rated speed/rated frequency.
10. according to the oil return control system of compressor governing system described in claim 7 or 8, it is characterised in that including:
Described first pre-conditioned weighted calculation formula is:
T=t1/30+t2/40+t3/50+t4/60；
Above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and the 4th timing time；T is the calculation result data of above-mentioned weighted calculation formula；
Described predetermined number is 1；
Described predetermined timing time is 3 minutes；
Described first Preset Time in the range of: 90 minutes-120 minutes；Described second time is 3 minutes.
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