CN105443386A - Pulse control method and device for screw compressor - Google Patents
Pulse control method and device for screw compressor Download PDFInfo
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- CN105443386A CN105443386A CN201510976304.6A CN201510976304A CN105443386A CN 105443386 A CN105443386 A CN 105443386A CN 201510976304 A CN201510976304 A CN 201510976304A CN 105443386 A CN105443386 A CN 105443386A
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- load
- predefined value
- loading
- helical
- current loads
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/01—Load
- F04C2270/015—Controlled or regulated
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention provides a pulse control method and a pulse control device for a screw compressor. The screw compressor pulse control method comprises the following steps: detecting the current load of the screw compressor, and controlling the loading pulse time according to the current load, wherein when the current load is increased, the opening time of the 100% loading electromagnetic valve is controlled to be reduced, and the closing time of the 100% loading electromagnetic valve is controlled to be increased. According to the invention, the loading pulse time is controlled according to the current load, namely the opening time of the 100% loading electromagnetic valve is reduced and the closing time is increased along with the increase of the current load. Compared with the existing fixed value control mode, the control precision can be effectively improved, the situation that the loading of the unit is accelerated along with the increase of the load is avoided, the unit can quickly stabilize the water outlet temperature, the refrigeration effect under low pressure difference is improved, and meanwhile low-pressure protection under large load is prevented.
Description
Technical field
The present invention relates to helical-lobe compressor control field, in particular to a kind of helical-lobe compressor pulse control method and control gear.
Background technique
In prior art, helical-lobe compressor pulse regulation generally adopts step-less adjustment, namely by a certain fixed pulse mode (open A to stop second B second) to corresponding Load-unload solenoid valves (25% ~ 100% energising), reach the object held and adjust, time of pulse regulation (open A to stop second B second) has nothing to do with operating mode and load.Namely regulating impulse is fixed value, the situation that the loading causing unit to cause along with the increase of load accelerates, and unit can not fast and stable water-exit temperature.Under large load, unit easily loads and causes low-voltage variation soon simultaneously, and under low voltage difference, unit loads affects refrigeration slowly.
Summary of the invention
The present invention aims to provide a kind of helical-lobe compressor pulse control method and the control gear that can improve control accuracy.
The invention provides a kind of helical-lobe compressor pulse control method, the method comprises: the current loads detecting helical-lobe compressor, according to the current loads controlled loading burst length, wherein, when current loads increases, 100% time of offering loading solenoid valve that controlled reduces, and 100% shut-in time loading solenoid valve increased.
Further, when current loads is less than or equal to the first predefined value, controls 100% and load solenoid valve and open A1 and stop B1 second second; When current loads is greater than the first predefined value and is less than or equal to the second predefined value, control 100% and load solenoid valve and open A2 and stop B2 second second; When current loads is greater than the second predefined value, controls 100% and load solenoid valve and open A3 and stop B3 second second, wherein, A1 > A2 > A3; B1 < B2 < B3.
Further, the scope of the first predefined value is 30% to 40%; The scope of the second predefined value is the first predefined value to 60%.
Further, detect the fluctuation of load of the screw compressor in predetermined period, when fluctuation of load is greater than predefined value, keep the load pulses time constant in Preset Time.
Further, after the maintenance load pulses time is constant in Preset Time, according to the load at the end of Preset Time or the mean load controlled loading burst length in Preset Time.
Present invention also offers a kind of helical-lobe compressor pulse control unit, this device comprises: detection unit, for detecting the current loads of helical-lobe compressor; Control unit, for according to the current loads controlled loading burst length, wherein, when current loads increases, 100% time of offering loading solenoid valve that controlled reduces, and 100% shut-in time loading solenoid valve increased.
Further, control unit comprises: first controls subelement, for when current loads is less than or equal to the first predefined value, controls 100% loading solenoid valve and opens A1 and stop B1 second second; Second controls subelement, during for being greater than the first predefined value when current loads and being less than or equal to the second predefined value, controls 100% loading solenoid valve and opens A2 and stop B2 second second; 3rd controls subelement, for when current loads is greater than the second predefined value, controls 100% loading solenoid valve and opens A3 and stop B3 second second, wherein, and A1 > A2 > A3; B1 < B2 < B3.
Further, the scope of the first predefined value is 30% to 40%; The scope of the second predefined value is the first predefined value to 60%.
Further, device also comprises pressure control unit, for detecting the fluctuation of load of the screw compressor in predetermined period, when fluctuation of load is greater than predefined value, keeps the load pulses time constant in Preset Time.
Further, control unit also for pressure control unit keep the load pulses time constant in Preset Time after, according to the load at the end of Preset Time or the mean load controlled loading burst length in Preset Time.
According to helical-lobe compressor pulse control method of the present invention and control gear, by according to the current loads controlled loading burst length, namely along with current loads increases, 100% time of offering loading solenoid valve reduced, and the shut-in time increases.Compare the control mode of existing fixed value; effectively can improve control accuracy, the situation that the loading avoiding unit to cause along with the increase of load accelerates, ensure that unit can fast and stable water-exit temperature; improve the refrigeration under low voltage difference, prevent low-voltage variation under large load simultaneously.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the principle schematic of helical-lobe compressor;
Fig. 2 is the principle schematic according to helical-lobe compressor pulse control method of the present invention.
Description of reference numerals:
1,100% holds tune solenoid valve; 2,25% holds tune solenoid valve; 3, oil hydraulic cylinder; 4, tune piston is held.
Embodiment
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As depicted in figs. 1 and 2, according to helical-lobe compressor pulse control method of the present invention, the method comprises: the current loads detecting helical-lobe compressor, according to the current loads controlled loading burst length, wherein, when current loads increases, 100% time of offering loading solenoid valve that controlled reduces, and 100% shut-in time loading solenoid valve increased.The present invention is by according to the current loads controlled loading burst length, and namely along with current loads increases, 100% time of offering loading solenoid valve reduced, and the shut-in time increases.Compare the control mode of existing fixed value; effectively can improve control accuracy, the situation that the loading avoiding unit to cause along with the increase of load accelerates, ensure that unit can fast and stable water-exit temperature; improve the refrigeration under low voltage difference, prevent low-voltage variation under large load simultaneously.
Particularly, can adopt and current load is divided into different intervals, then each interval corresponding a kind of load pulses time.Namely, when current loads is less than or equal to the first predefined value, control 100% and load solenoid valve and open A1 and stop B1 second second; When current loads is greater than the first predefined value and is less than or equal to the second predefined value, control 100% and load solenoid valve and open A2 and stop B2 second second; When current loads is greater than the second predefined value, controls 100% and load solenoid valve and open A3 and stop B3 second second, wherein, A1 > A2 > A3; B1 < B2 < B3.Because the flow of loading velocity by the lubricant oil entering oil hydraulic cylinder is determined, piston is adjusted to carry out capacity regulating by holding.The flow of lubricant oil is determined by oil circuit sectional area and load (height pressure reduction) situation of foundation.So in different load ranges, select different load pulses, the stable even that can realize unit loads, and realizes refrigerating capacity and precisely exports.
Preferably, the scope of the first predefined value is 30% to 40%; The scope of the second predefined value is the first predefined value to 60%, and when namely the first predefined value is determined value, the scope of the second predefined value is determined, the scope being the 30%, second predefined value as the first predefined value is 30% to 60%; First predefined value is the scope of the 40%, second predefined value is 40% to 60%; First predefined value is the scope of the 35%, second predefined value is 35% to 60%.When first predefined value and the second predefined value adopt above-mentioned scope, the stable even that more can be conducive to realizing unit loads, and realizes refrigerating capacity and precisely exports.
Further, helical-lobe compressor pulse control method of the present invention also comprises, detect the fluctuation of load of the screw compressor in predetermined period, when fluctuation of load is greater than predefined value, keep the load pulses time constant in Preset Time, thus prevent because the unreasonable unit load that causes of compressor design itself loads too fast and unit exception that is that cause.After the maintenance load pulses time is constant in Preset Time, according to the load at the end of Preset Time or the mean load in Preset Time according to the aforementioned manner controlled loading burst length, can more effectively ensure unit smooth running, improve reliability.
Present invention also offers the control gear that a kind of and aforesaid helical-lobe compressor pulse control method is corresponding, this control gear comprises: detection unit, for detecting the current loads of helical-lobe compressor; Control unit, for according to the current loads controlled loading burst length, wherein, when current loads increases, 100% time of offering loading solenoid valve that controlled reduces, and 100% shut-in time loading solenoid valve increased.The present invention is by according to the current loads controlled loading burst length, and namely along with current loads increases, 100% time of offering loading solenoid valve reduced, and the shut-in time increases.Compare the control mode of existing fixed value; effectively can improve control accuracy, the situation that the loading avoiding unit to cause along with the increase of load accelerates, ensure that unit can fast and stable water-exit temperature; improve the refrigeration under low voltage difference, prevent low-voltage variation under large load simultaneously.
Particularly, control unit comprises: first controls subelement, for when current loads is less than or equal to the first predefined value, controls 100% loading solenoid valve and opens A1 and stop B1 second second; Second controls subelement, during for being greater than the first predefined value when current loads and being less than or equal to the second predefined value, controls 100% loading solenoid valve and opens A2 and stop B2 second second; 3rd controls subelement, for when current loads is greater than the second predefined value, controls 100% loading solenoid valve and opens A3 and stop B3 second second, wherein, and A1 > A2 > A3; B1 < B2 < B3, in different load ranges, selects different load pulses, and the stable even that can realize unit loads, and realizes refrigerating capacity and precisely exports.
Preferably, the scope of the first predefined value is 30% to 40%; The scope of the second predefined value is the first predefined value to 60%, and the stable even that more can be conducive to realizing unit loads, and realizes refrigerating capacity and precisely exports.
Further, control gear also comprises pressure control unit, for detecting the fluctuation of load of the screw compressor in predetermined period, when fluctuation of load is greater than predefined value, keeps the load pulses time constant in Preset Time.Namely when load unusual fluctuations, force unit to keep the load pulses time after default second, then perform appearance regulation and control system.Prevent because the unreasonable unit load that causes of compressor design itself loads too fast that unit that is that cause is abnormal.After the pressure control unit maintenance load pulses time is constant in Preset Time, according to the load at the end of Preset Time or the mean load controlled loading burst length in Preset Time.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
According to helical-lobe compressor pulse control method of the present invention and control gear, by according to the current loads controlled loading burst length, namely along with current loads increases, 100% time of offering loading solenoid valve reduced, and the shut-in time increases.Compare the control mode of existing fixed value; effectively can improve control accuracy, the situation that the loading avoiding unit to cause along with the increase of load accelerates, ensure that unit can fast and stable water-exit temperature; improve the refrigeration under low voltage difference, prevent low-voltage variation under large load simultaneously.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a helical-lobe compressor pulse control method, is characterized in that, described method comprises:
Detect the current loads of described helical-lobe compressor, according to the described current loads controlled loading burst length, wherein, when described current loads increases, 100% time of offering loading solenoid valve that controlled reduces, and described 100% shut-in time loading solenoid valve increased.
2. helical-lobe compressor pulse control method according to claim 1, is characterized in that,
When described current loads is less than or equal to the first predefined value, controls described 100% and load solenoid valve and open A1 and stop B1 second second;
When described current loads is greater than described first predefined value and is less than or equal to the second predefined value, control described 100% and load solenoid valve and open A2 and stop B2 second second;
When described current loads is greater than the second predefined value, controls described 100% and load solenoid valve and open A3 and stop B3 second second, wherein, A1 > A2 > A3; B1 < B2 < B3.
3. helical-lobe compressor pulse control method according to claim 2, is characterized in that,
The scope of described first predefined value is 30% to 40%;
The scope of described second predefined value is the first predefined value to 60%.
4. helical-lobe compressor pulse control method according to any one of claim 1 to 3, is characterized in that,
Detect the fluctuation of load of the described screw compressor in predetermined period, when described fluctuation of load is greater than predefined value, keep the described load pulses time constant in Preset Time.
5. helical-lobe compressor pulse control method according to claim 4, is characterized in that,
Keep the described load pulses time constant in Preset Time after, control the described load pulses time according to the load at the end of Preset Time or the mean load in Preset Time.
6. a helical-lobe compressor pulse control unit, is characterized in that, described device comprises:
Detection unit, for detecting the current loads of described helical-lobe compressor;
Control unit, for according to the described current loads controlled loading burst length, wherein, when described current loads increases, 100% time of offering loading solenoid valve that controlled reduces, and described 100% shut-in time loading solenoid valve increased.
7. helical-lobe compressor pulse control unit according to claim 6, is characterized in that, described control unit comprises:
First controls subelement, for when described current loads is less than or equal to the first predefined value, controls described 100% loading solenoid valve and opens A1 and stop B1 second second;
Second controls subelement, during for being greater than described first predefined value when described current loads and being less than or equal to the second predefined value, controls described 100% loading solenoid valve and opens A2 and stop B2 second second;
3rd controls subelement, for when described current loads is greater than the second predefined value, controls described 100% loading solenoid valve and opens A3 and stop B3 second second, wherein, and A1 > A2 > A3; B1 < B2 < B3.
8. helical-lobe compressor pulse control unit according to claim 7, is characterized in that,
The scope of described first predefined value is 30% to 40%;
The scope of described second predefined value is the first predefined value to 60%.
9. the helical-lobe compressor pulse control unit according to any one of claim 6 to 8, it is characterized in that, described device also comprises pressure control unit, for detecting the fluctuation of load of the described screw compressor in predetermined period, when described fluctuation of load is greater than predefined value, keep the described load pulses time constant in Preset Time.
10. helical-lobe compressor pulse control unit according to claim 9, is characterized in that,
Described control unit also for keep at described pressure control unit the described load pulses time constant in Preset Time after, control the described load pulses time according to the load at the end of Preset Time or the mean load in Preset Time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510976304.6A CN105443386B (en) | 2015-12-21 | 2015-12-21 | Pulse control method and device for screw compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510976304.6A CN105443386B (en) | 2015-12-21 | 2015-12-21 | Pulse control method and device for screw compressor |
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| Publication Number | Publication Date |
|---|---|
| CN105443386A true CN105443386A (en) | 2016-03-30 |
| CN105443386B CN105443386B (en) | 2019-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510976304.6A Active CN105443386B (en) | 2015-12-21 | 2015-12-21 | Pulse control method and device for screw compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810394A (en) * | 2020-05-18 | 2020-10-23 | 格力电器（合肥）有限公司 | Compressor loading control method, system, equipment, storage medium and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0552194A (en) * | 1991-08-22 | 1993-03-02 | Daikin Ind Ltd | Capacity control device of screw type two-step compressor |
| CN104566837A (en) * | 2015-02-02 | 2015-04-29 | 珠海格力电器股份有限公司 | Air conditioning unit loading control method and system |
| CN104848620A (en) * | 2015-05-11 | 2015-08-19 | 珠海格力电器股份有限公司 | Starting loading control method and system for screw type water chilling unit |
| CN105179253A (en) * | 2015-09-10 | 2015-12-23 | 珠海格力电器股份有限公司 | Capacity adjusting method for screw compressor |
-
2015
- 2015-12-21 CN CN201510976304.6A patent/CN105443386B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0552194A (en) * | 1991-08-22 | 1993-03-02 | Daikin Ind Ltd | Capacity control device of screw type two-step compressor |
| CN104566837A (en) * | 2015-02-02 | 2015-04-29 | 珠海格力电器股份有限公司 | Air conditioning unit loading control method and system |
| CN104848620A (en) * | 2015-05-11 | 2015-08-19 | 珠海格力电器股份有限公司 | Starting loading control method and system for screw type water chilling unit |
| CN105179253A (en) * | 2015-09-10 | 2015-12-23 | 珠海格力电器股份有限公司 | Capacity adjusting method for screw compressor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810394A (en) * | 2020-05-18 | 2020-10-23 | 格力电器（合肥）有限公司 | Compressor loading control method, system, equipment, storage medium and electronic equipment |
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| CN105443386B (en) | 2019-12-27 |
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