CN105443386B - Pulse control method and device for screw compressor - Google Patents
Pulse control method and device for screw compressor Download PDFInfo
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- CN105443386B CN105443386B CN201510976304.6A CN201510976304A CN105443386B CN 105443386 B CN105443386 B CN 105443386B CN 201510976304 A CN201510976304 A CN 201510976304A CN 105443386 B CN105443386 B CN 105443386B
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- loading
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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 invention relates to the field of screw compressor control, in particular to a screw compressor pulse control method and a screw compressor pulse control device.
Background
In the prior art, the pulse regulation of the screw compressor generally adopts stepless regulation, namely, the corresponding loading and unloading electromagnetic valves are electrified (25 to 100 percent electrified) in a certain fixed pulse mode (starting A seconds and stopping B seconds), so that the purpose of capacity regulation is achieved, and the pulse regulation time (starting A seconds and stopping B seconds) is irrelevant to the working condition and the load. That is, the pulse is adjusted to a fixed value, which causes the situation that the loading of the unit becomes fast along with the increase of the load, and the unit cannot stabilize the outlet water temperature fast. Meanwhile, the unit is easy to load quickly under a large load to cause low-pressure protection, and the unit loading slowly affects the refrigeration effect under a low pressure difference.
Disclosure of Invention
The invention aims to provide a screw compressor pulse control method and a screw compressor pulse control device capable of improving control precision.
The invention provides a pulse control method of a screw compressor, which 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.
Further, when the current load is smaller than or equal to a first preset value, controlling the 100% loading electromagnetic valve to be opened for A1 seconds and stopped for B1 seconds; when the current load is larger than the first preset value and smaller than or equal to the second preset value, controlling the 100% loading electromagnetic valve to be opened for A2 seconds and stopped for B2 seconds; when the current load is larger than a second preset value, controlling the 100% loading electromagnetic valve to be opened for A3 seconds and stopped for B3 seconds, wherein A1 is larger than A2 is larger than A3; b1 < B2 < B3.
Further, the first preset value ranges from 30% to 40%; the second preset value ranges from the first preset value to 60%.
Further, the load fluctuation of the screw compressor in a preset period is detected, and when the load fluctuation is larger than a preset value, the loading pulse time is kept unchanged in the preset time.
Further, after keeping the loading pulse time constant within the preset time, the loading pulse time is controlled according to the load at the end of the preset time or the average load within the preset time.
The invention also provides a screw compressor pulse control device, which comprises: the detection unit is used for detecting the current load of the screw compressor; and the control unit is used for 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.
Further, the control unit includes: the first control subunit is used for controlling the 100% loading electromagnetic valve to open A1 and stop B1 seconds when the current load is less than or equal to a first preset value; the second control subunit is used for controlling the 100% loading electromagnetic valve to open A2 seconds and stop B2 seconds when the current load is greater than the first preset value and less than or equal to a second preset value; the third control subunit is used for controlling the 100% loading electromagnetic valve to be opened for A3 seconds and stopped for B3 seconds when the current load is larger than the second preset value, wherein A1 is larger than A2 and is larger than A3; b1 < B2 < B3.
Further, the first preset value ranges from 30% to 40%; the second preset value ranges from the first preset value to 60%.
Further, the device also comprises a forced control unit which is used for detecting the load fluctuation of the screw compressor in a preset period, and when the load fluctuation is larger than a preset value, the loading pulse time is kept unchanged in the preset time.
Further, the control unit is further configured to control the loading pulse time according to the load at the end of the preset time or the average load in the preset time after the forced control unit keeps the loading pulse time unchanged within the preset time.
According to the pulse control method and the pulse control device for the screw compressor, 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.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a screw compressor;
fig. 2 is a schematic view of the principle of the pulse control method of the screw compressor according to the present invention.
Description of reference numerals:
1. a 100% capacity regulating solenoid valve; 2. 25% volume-adjustable electromagnetic valve; 3. an oil hydraulic cylinder; 4. and (4) accommodating and adjusting the piston.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 2, the screw compressor pulse control method according to the present invention includes: 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.
Specifically, it is possible to divide the current load into different intervals, and each interval corresponds to one kind of loading pulse time. When the current load is smaller than or equal to a first preset value, controlling the 100% loading electromagnetic valve to be opened for A1 seconds and stopped for B1 seconds; when the current load is larger than the first preset value and smaller than or equal to the second preset value, controlling the 100% loading electromagnetic valve to be opened for A2 seconds and stopped for B2 seconds; when the current load is larger than a second preset value, controlling the 100% loading electromagnetic valve to be opened for A3 seconds and stopped for B3 seconds, wherein A1 is larger than A2 is larger than A3; b1 < B2 < B3. Since the loading speed is determined by the flow rate of the lubricating oil entering the oil hydraulic cylinder, the capacity adjustment is carried out through the capacity adjustment piston. The flow rate of the lubricating oil is determined by the sectional area of the oil passage and the load (high-low pressure difference) establishment condition. Therefore, in different load ranges, different loading pulses are selected, stable and uniform loading of the unit can be realized, and accurate output of refrigerating capacity is realized.
Preferably, the first preset value ranges from 30% to 40%; the second preset value ranges from the first preset value to 60%, that is, when the first preset value is a determined value, the second preset value ranges from 30% to 60%, if the first preset value is 30%; the first preset value is 40%, and the second preset value ranges from 40% to 60%; the first preset value is 35% and the second preset value ranges from 35% to 60%. When the first preset value and the second preset value are within the ranges, stable and even loading of the unit can be achieved, and accurate output of refrigerating output is achieved.
Further, the screw compressor pulse control method of the invention further comprises the steps of detecting the load fluctuation of the screw compressor in the preset period, and keeping the loading pulse time unchanged in the preset time when the load fluctuation is larger than the preset value, thereby preventing the unit abnormality caused by the too fast unit load due to the unreasonable design of the compressor. After the loading pulse time is kept unchanged within the preset time, the loading pulse time is controlled according to the load when the preset time is finished or the average load within the preset time in the manner, so that the stable operation of the unit can be effectively ensured, and the reliability is improved.
The invention also provides a control device corresponding to the pulse control method of the screw compressor, and the control device comprises: the detection unit is used for detecting the current load of the screw compressor; and the control unit is used for 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.
Specifically, the control unit includes: the first control subunit is used for controlling the 100% loading electromagnetic valve to open A1 and stop B1 seconds when the current load is less than or equal to a first preset value; the second control subunit is used for controlling the 100% loading electromagnetic valve to open A2 seconds and stop B2 seconds when the current load is greater than the first preset value and less than or equal to a second preset value; the third control subunit is used for controlling the 100% loading electromagnetic valve to be opened for A3 seconds and stopped for B3 seconds when the current load is larger than the second preset value, wherein A1 is larger than A2 and is larger than A3; b1 < B2 < B3, and different loading pulses are selected in different load ranges, so that stable, stable and uniform loading of the unit can be realized, and accurate output of refrigerating capacity is realized.
Preferably, the first preset value ranges from 30% to 40%; the range of the second preset value is from the first preset value to 60%, so that stable and stable uniform loading of the unit can be realized, and accurate output of refrigerating output is realized.
Further, the control device also comprises a forced control unit for detecting the load fluctuation of the screw compressor in a preset period, and when the load fluctuation is larger than a preset value, keeping the loading pulse time unchanged in a preset time. Namely, when the load is abnormally fluctuated, the unit is forced to keep the loading pulse time at the preset second, and then capacity control is executed. The unit abnormity caused by too fast unit load loading due to the unreasonable design of the compressor is prevented. And after the forced control unit keeps the loading pulse time unchanged within the preset time, controlling the loading pulse time according to the load at the end of the preset time or the average load within the preset time.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
according to the pulse control method and the pulse control device for the screw compressor, 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.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method of pulse control for a screw compressor, the method comprising:
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 a 100% loading electromagnetic valve is controlled to be reduced, and the closing time of the 100% loading electromagnetic valve is increased;
when the current load is smaller than or equal to a first preset value, controlling the 100% loading electromagnetic valve to be opened for A1 seconds and stopped for B1 seconds;
when the current load is larger than the first preset value and smaller than or equal to a second preset value, controlling the 100% loading solenoid valve to be opened for A2 seconds and stopped for B2 seconds;
when the current load is larger than a second preset value, controlling the 100% loading electromagnetic valve to be opened for A3 seconds and stopped for B3 seconds, wherein A1 is larger than A2 is larger than A3; b1 < B2 < B3;
the first preset value ranges from 30% to 40%;
the second preset value ranges from the first preset value to 60%.
2. Pulse control method for a screw compressor according to claim 1,
and detecting the load fluctuation of the screw compressor in a preset period, and keeping the loading pulse time unchanged in a preset time when the load fluctuation is greater than a preset value.
3. Pulse control method for a screw compressor according to claim 2,
and after keeping the loading pulse time unchanged within the preset time, controlling the loading pulse time according to the load at the end of the preset time or the average load within the preset time.
4. A pulse control device for a screw compressor, the device comprising:
the detection unit is used for detecting the current load of the screw compressor;
the control unit is used for 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 increased;
the control unit includes:
the first control subunit is used for controlling the 100% loading electromagnetic valve to be opened for A1 seconds and stopped for B1 seconds when the current load is smaller than or equal to a first preset value;
the second control subunit is used for controlling the 100% loading electromagnetic valve to be opened for A2 seconds and stopped for B2 seconds when the current load is greater than the first preset value and less than or equal to a second preset value;
the third control subunit is used for controlling the 100% loading electromagnetic valve to be opened for A3 seconds and stopped for B3 seconds when the current load is larger than a second preset value, wherein A1 is larger than A2 and is larger than A3; b1 < B2 < B3;
the first preset value ranges from 30% to 40%;
the second preset value ranges from the first preset value to 60%.
5. Pulse control device for a screw compressor according to claim 4, characterised in that it further comprises a forcing control unit for detecting a load fluctuation of the screw compressor during a preset period, and when the load fluctuation is larger than a preset value, keeping the loading pulse time constant for a preset time.
6. Screw compressor pulse control device according to claim 5,
the control unit is further configured to control the loading pulse time according to a load at the end of a preset time or an average load within a preset time after the forced control unit keeps the loading pulse time unchanged within the 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 |
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| 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 |
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| CN105443386A CN105443386A (en) | 2016-03-30 |
| CN105443386B true CN105443386B (en) | 2019-12-27 |
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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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| 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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| JP2636579B2 (en) * | 1991-08-22 | 1997-07-30 | ダイキン工業株式会社 | Capacity control device for screw type two-stage compressor |
| CN104566837B (en) * | 2015-02-02 | 2018-01-02 | 珠海格力电器股份有限公司 | A kind of air-conditioner set loading control method and system |
| CN104848620B (en) * | 2015-05-11 | 2018-08-10 | 珠海格力电器股份有限公司 | Screw-type water chiller booting loading control method and system |
| CN105179253B (en) * | 2015-09-10 | 2017-04-19 | 珠海格力电器股份有限公司 | Capacity adjusting method for screw compressor |
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