CN116678147A - Progressive control method for helium screw compressor unit - Google Patents
Progressive control method for helium screw compressor unit Download PDFInfo
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- CN116678147A CN116678147A CN202310548549.3A CN202310548549A CN116678147A CN 116678147 A CN116678147 A CN 116678147A CN 202310548549 A CN202310548549 A CN 202310548549A CN 116678147 A CN116678147 A CN 116678147A
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 239000001307 helium Substances 0.000 title claims abstract description 53
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000000750 progressive effect Effects 0.000 title claims abstract description 23
- 230000033228 biological regulation Effects 0.000 claims abstract description 68
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 230000007423 decrease Effects 0.000 claims description 14
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims 1
- 238000005057 refrigeration Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
- F25B1/047—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The application relates to the technical field of refrigeration, in particular to a progressive control method for a helium screw compressor unit, which comprises the following steps: s1: presetting a pressure target value and a pressure regulation interval of a helium screw compressor unit, and calculating according to the pressure regulation interval to obtain a regulation proportion area, wherein: the pressure regulating interval is (K2, K1); k1 is the upper pressure limit value, and K2 is the lower pressure limit value; s2: acquiring a control variable of the pressure of the helium screw compressor unit; s3: judging whether the control variable is in the pressure regulation interval, and confirming the conduction duration time of the electromagnetic valve and the energizing time of the electromagnetic valve according to the judging result. The application can ensure that the system operates in the optimal state, and can prevent the problem of positive and negative deviation, thereby achieving the purpose of accurate control.
Description
Technical Field
The application relates to the technical field of refrigeration, in particular to a progressive control method for a helium screw compressor unit.
Background
The helium screw compressor is used as the largest energy consumption component in a compression refrigeration system, and directly influences the precision and stability of the system in high-precision application occasions. The load position or the internal volume ratio VI of the helium screw compressor is regulated by controlling the on-off of an oil way through an electromagnetic valve, as shown in figure 1, when the first electromagnetic valve 1 and the second electromagnetic valve 2 are electrified, the loading oil port 3 is conducted, the oil pressure pushes the compressor energy slide valve or the internal volume ratio slide valve to load, when the third electromagnetic valve 4 and the fourth electromagnetic valve 5 are electrified, the load reducing oil port 6 is conducted, and the oil pressure reversely pushes the energy slide valve or the internal volume ratio slide valve to reduce load. The capacity control and the internal volume ratio VI control of the traditional helium screw compressor unit adopt an interval control mode. When the control variable is greater than the 'set upper limit', interval load shedding is performed; when the control variable is less than the "lower set limit", then the interval is loaded. Taking helium unit discharge pressure control as an example: the compressor interval was de-rated when the helium unit discharge pressure was greater than the "upper pressure limit" 21bar, and the compressor interval was increased when the helium unit discharge pressure was less than the "lower pressure limit" 19bar, in order to control the discharge pressure around 20bar, and the energization time and interval time of the compressor increase and decrease were fixed as shown in table 1, unless re-modified manually.
However, the main problems of the conventional section control method are the following: 1. the best state of the helium screw compressor unit is that the exhaust pressure is always stabilized at a set point, for example, the exhaust pressure is 20bar, the exhaust pressure of the helium screw compressor unit cannot be precisely controlled at a certain set point by adopting a mode of interval control, only the helium screw compressor unit can be controlled in a section, if the section is too small, frequent adjustment is needed, the system is unstable, and if the section is too large, the requirement of the helium screw compressor unit for precisely running at the design pressure cannot be met. 2. The power-on time and the interval time set by the mode of interval control are fixed, and when interval setting is too small, a long time is needed for adjusting to a specified state, so that the requirement of initial rapid adjustment cannot be met; when the interval setting is too large, overshoot phenomenon is easy to occur, and the adjustment frequently causes large and unstable system fluctuation.
Disclosure of Invention
The technical problems to be solved by the application are as follows: the progressive control method for the helium screw compressor unit can ensure accurate control of the actual pressure or the internal volume ratio of the electromagnetic valve.
In order to solve the technical problems, the application adopts the following technical scheme:
a progressive control method for a helium screw compressor unit comprising the steps of:
s1: presetting a pressure target value and a pressure regulation interval of a helium screw compressor unit, and calculating according to the pressure regulation interval to obtain a regulation proportion area, wherein:
the pressure regulating interval is (K2, K1); k1 is the upper pressure limit value, and K2 is the lower pressure limit value;
s2: acquiring a control variable of the pressure of the helium screw compressor unit;
s3: judging whether the control variable is in the pressure regulation interval, and confirming the conduction duration time of the electromagnetic valve and the energizing time of the electromagnetic valve according to the judging result, wherein the method comprises the following steps of:
if the control variable is not in the pressure regulation interval, setting the conduction duration of the electromagnetic valve as a preset maximum power-on time, and setting the conduction interval time of the electromagnetic valve as a preset minimum interval time;
if the control variable is not in the pressure regulation interval, calculating an absolute value Q of a difference value between the control variable and the pressure target value, setting the electromagnetic valve on duration to be decreased along with the decrease of the Q value, and setting the electromagnetic valve on interval time to be increased along with the decrease of the Q value.
The application has the beneficial effects that: according to the progressive control method for the helium screw compressor unit, when the Q value is in the pressure regulation interval, the conduction duration of the electromagnetic valve is set to be decreased along with the decrease of the Q value, and the conduction interval time of the electromagnetic valve is set to be increased along with the decrease of the Q value. When the control variable is close to the target value, the conduction duration of the electromagnetic valve is shorter, and the conduction interval time of the electromagnetic valve is longer, so that the adjustment speed is reduced, the accurate matching of the actual value and the target value is ensured, the overshoot phenomenon is avoided, and the response speed and the stability are ensured; in addition, the application changes the target value from the traditional upper and lower limit intervals to the set point, when the control target is achieved, the system can be ensured to operate in the optimal state, and the problem of positive and negative deviation can be prevented, thereby achieving the aim of accurate control.
Drawings
Fig. 1 is a schematic diagram of an oil path structure of a solenoid valve described in the prior art;
FIG. 2 is a schematic diagram of a solenoid valve according to the prior art;
FIG. 3 is a flow chart of the steps of a progressive control method for a helium screw compressor unit according to the present application;
FIG. 4 is a schematic illustration of a progressive control method for a helium screw compressor set according to the present application;
description of the reference numerals:
1. a first electromagnetic valve; 2. a second electromagnetic valve; 3. a loading oil port; 4. a third electromagnetic valve; 5. a fourth electromagnetic valve; 6. a load shedding oil port; 7. an air suction pipe; 8. an oil inlet passage; 9. an oil return passage; 10. an energy slide valve; 11. internal volume ratio spool valve.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present application in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 3 to 4, a progressive control method for a helium screw compressor unit is provided, comprising the steps of:
s1: presetting a pressure target value and a pressure regulation interval of a helium screw compressor unit, and calculating according to the pressure regulation interval to obtain a regulation proportion area, wherein:
the pressure regulating interval is (K2, K1);
k1 is the upper pressure limit value, and K2 is the lower pressure limit value;
s2: acquiring a control variable of the pressure of the helium screw compressor unit;
s3: judging whether the control variable is in the pressure regulation interval, and confirming the conduction duration time of the electromagnetic valve and the energizing time of the electromagnetic valve according to the judging result, wherein the method comprises the following steps of:
if the control variable is not in the pressure regulation interval, setting the conduction duration of the electromagnetic valve as a preset maximum power-on time, and setting the conduction interval time of the electromagnetic valve as a preset minimum interval time;
if the control variable is not in the pressure regulation interval, calculating an absolute value Q of a difference value between the control variable and the pressure target value, setting the electromagnetic valve on duration to be decreased along with the decrease of the Q value, and setting the electromagnetic valve on interval time to be increased along with the decrease of the Q value.
From the above description, the beneficial effects of the application are as follows: a progressive control method for a helium screw compressor is provided, wherein when Q value is less than or equal to K, a control variable is located in a pressure adjustment interval, a solenoid valve conduction duration is set to decrease as the Q value decreases, and a solenoid valve conduction interval time is set to increase as the Q value decreases. When the control variable is close to the target value, the conduction duration of the electromagnetic valve is shorter, and the conduction interval time of the electromagnetic valve is longer, so that the adjustment speed is reduced, the accurate matching of the actual value and the target value is ensured, the overshoot phenomenon is avoided, and the response speed and the stability are ensured; in addition, the application changes the target value from the traditional upper and lower limit intervals to the set point, when the control target is achieved, the system can be ensured to operate in the optimal state, and the problem of positive and negative deviation can be prevented, thereby achieving the aim of accurate control.
Further, the step S1 specifically further includes:
presetting a section set value as K, and calculating to obtain a pressure regulation section according to the section set value and a pressure target value,
k1 =s-K, k2=s+k, S being the pressure target value.
From the above description, through presetting an interval set value and a pressure target value, a pressure regulation interval can be obtained by rapid calculation according to a formula, further a regulation proportion area is obtained, and the obtained regulation proportion area is compared with an absolute value Q to obtain the interval time and duration time of the conduction of the electromagnetic valve, so that accurate control is realized.
Further, the step S1 specifically further includes:
the pressure regulation section comprises a dead zone regulation section, and the pressure target value is in the dead zone regulation section;
the dead zone adjustment interval is (K2 ', K1'), which is specifically as follows:
K2’＝S-K’，K1’＝S+K’。
proportional zone of regulation corresponding to dead zone
When the control variable is within the dead zone adjustment interval, the solenoid valve on duration is set to a preset minimum on time.
As can be seen from the above description, by adding the dead zone control function in the pressure adjustment interval, when the difference between the control variable and the target is within the dead zone range, the conduction duration of the solenoid valve is 0, and the system is not adjusted, so as to achieve the optimal stabilization effect, thereby ensuring that the exhaust pressure of the helium screw compressor unit is kept stable for a long time.
Further, the step S1 specifically further includes:
dividing the calculated regulation proportion area into a plurality of proportion regulation areas, and setting corresponding electromagnetic valve conduction duration and electromagnetic valve conduction interval time for each proportion regulation area.
Further, the step S1 specifically further includes:
dividing the calculated regulation proportion area into three proportion regulation areas, wherein the ranges of the three proportion regulation areas are respectively as follows:
the first proportion adjustment interval isOr->The second proportional adjustment interval is->Or->The third proportional adjustment interval is->Or->
When the Q value is within the first proportional adjustment interval,
when the Q value is within the second scaling interval,
when the Q value is within the third scaling interval,
wherein, T1 is the conduction duration of the electromagnetic valve, T2 is the conduction interval time of the electromagnetic valve, T1 is the preset maximum power-on time, and T2 is the preset maximum interval time.
From the above description, the pressure adjusting sections can be respectively adjusted in a multi-section mode, so that the problem that the adjusting sections are too large is avoided, the control variable can be quickly adjusted when being far away from the target value, fine adjustment is performed when the control variable is close to the target value, gradual adjustment and control are achieved, and the response speed and stability of the system are guaranteed.
Further, the preset maximum power-on time is 1s, and the preset maximum interval time is 10s.
Further, the control variable of the helium screw compressor group pressure is acquired every other cycle period, and the cycle period is set to 3 seconds.
From the above description, the control variable of the helium screw compressor unit pressure is obtained every 3s, and when the calculated Q value exceeds the dead zone range, the system can be circularly regulated according to the regulating section where the Q value is located, so that the system returns to the target value again and continuously and stably operates.
Referring to fig. 3 to 4, a first embodiment of the present application is as follows:
the progressive control method for the helium screw compressor unit is applied to an electromagnetic valve of the helium screw compressor unit, and the electromagnetic valve comprises a first electromagnetic valve 1, a second electromagnetic valve 2, a loading oil port 3, a third electromagnetic valve 4, a fourth electromagnetic valve 5, a load shedding oil port 6, an air suction pipe 7, an oil inlet channel 8 and an oil return channel 9. Specifically, the first electromagnetic valve is respectively communicated with the oil inlet channel and the oil loading port, the third electromagnetic valve is respectively communicated with one ends of the oil loading port and the oil return channel, the fourth electromagnetic valve is respectively communicated with the oil inlet channel and the oil unloading port, the second electromagnetic valve is respectively communicated with one ends of the oil unloading port and the oil return channel, and the other ends of the oil return channels are communicated with the air suction pipe. When the first electromagnetic valve and the second electromagnetic valve are electrified, the oil loading port is conducted, and the oil pressure pushes the energy slide valve 10 or the inner volume ratio slide valve 11 of the compressor to load. When the third electromagnetic valve and the fourth electromagnetic valve are electrified, the load-shedding oil port is conducted, and the oil pressure reversely pushes the compressor energy slide valve or the internal volume ratio slide valve to unload. The progressive control method for the helium screw compressor unit realizes progressive control by controlling the conduction interval time and the conduction duration time of the third electromagnetic valve, the first electromagnetic valve, the fourth electromagnetic valve and the second electromagnetic valve.
A progressive control method for a helium screw compressor unit comprising the steps of:
s1: presetting a pressure target value and a pressure regulation interval of a helium screw compressor unit, and calculating according to the pressure regulation interval to obtain a regulation proportion area, wherein:
the pressure regulating interval is (K2, K1);
k1 is the upper pressure limit value, and K2 is the lower pressure limit value;
s2: acquiring a control variable of the pressure of the helium screw compressor unit;
s3: judging whether the control variable is in the pressure regulation interval, and confirming the conduction duration time of the electromagnetic valve and the energizing time of the electromagnetic valve according to the judging result, wherein the method comprises the following steps of:
if the control variable is not in the pressure regulation interval, setting the conduction duration of the electromagnetic valve as a preset maximum power-on time, and setting the conduction interval time of the electromagnetic valve as a preset minimum interval time;
if the control variable is not in the pressure regulation interval, calculating an absolute value Q of a difference value between the control variable and the pressure target value, setting the electromagnetic valve on duration to be decreased along with the decrease of the Q value, and setting the electromagnetic valve on interval time to be increased along with the decrease of the Q value.
The step S1 specifically further comprises the following steps:
presetting a section set value as K, and calculating to obtain a pressure regulation section according to the section set value and a pressure target value,
k1 =s-K, k2=s+k, S being the pressure target value.
Specifically, the actual pressure or the internal volume ratio of the helium screw compressor unit is the target value of the gradual control method, and taking the actual pressure as an example, in step S1, the target value of the pressure of the helium screw compressor unit is preset to be within the pressure adjustment interval, and the intermediate value of the pressure adjustment interval is taken as the target value. The control system of the helium screw compressor unit needs to enter a control program to set operation parameters before working, wherein the preset operation parameters comprise a pressure target value, a preset maximum energization time of the electromagnetic valve, a preset minimum energization time of the electromagnetic valve, a preset maximum interval time of the electromagnetic valve, a preset minimum interval time of the electromagnetic valve, a pressure upper limit value and a pressure lower limit value corresponding to a pressure regulation interval. Preferably, the pressure target value S is 20bar, the interval set value K is 1bar, the pressure upper limit value K1 is 21bar, the pressure lower limit value K2 is 19bar, the preset maximum energization time is 1S, and the preset maximum interval time is 10S. The operation parameters can be flexibly set according to the system model of the helium screw compressor unit, the oil pressure and other conditions, so that different system requirements can be matched.
In this embodiment, step S1 specifically further includes:
the pressure regulation interval comprises a dead zone regulation interval, the pressure target value is in the range of the dead zone regulation interval, and the dead zone corresponds to the regulation proportion zone
Specifically, the dead zone adjustment section is (K2 ', K1'), where K2 '=s-K', K1 '=s+k'.
When the control variable is within the dead zone adjustment interval, the solenoid valve on duration is set to a preset minimum on time.
Preferably, the dead band adjustment interval is (19.9 bar,20.1 bar) when K' is 0.1 bar. When the control variable is within the dead zone adjustment interval, for example, the control variable is 19.99 or 20.05, the solenoid valve is turned on for a duration of 0s, i.e., the solenoid valve is no longer turned on, when the control variable is also within the dead zone adjustment interval. Because the electromagnetic valve is conducted, the pressure state of the system can be fluctuated no matter how much the amplitude and the interval time are, when the control variable enters the dead zone, the electromagnetic valve is not regulated, the long-term stable exhaust pressure of the helium screw compressor unit is ensured, the optimal stable effect is achieved, and the system can continuously and stably run in the current state.
In this embodiment, step S1 specifically further includes:
dividing the calculated regulation proportion area into three proportion regulation areas, wherein the ranges of the three proportion regulation areas are respectively as follows:
the first proportion adjustment interval isOr->The second proportional adjustment interval is->Or->The third proportional adjustment interval is-> Or (b)
When the Q value is within the first proportional adjustment interval,
when the Q value is within the second scaling interval,
when the Q value is within the third scaling interval,
wherein, T1 is the conduction duration of the electromagnetic valve, T2 is the conduction interval time of the electromagnetic valve, T1 is the preset maximum power-on time, and T2 is the preset maximum interval time.
Refer to table 1 below:
TABLE 1
Working principle:
when the control variable is not in the pressure regulation interval, the control variable is positioned outside the pressure regulation interval, the conduction duration of the electromagnetic valve is set to be a preset maximum power-on time, the conduction interval time of the electromagnetic valve is set to be a preset minimum interval time, and the electromagnetic valve has the fastest response speed and the fastest regulation speed;
when the control variable is located within the pressure adjustment interval, since the adjustment ratio region is divided into three proportion adjustment intervals and a dead zone adjustment interval. Therefore, it is necessary to determine which proportional adjustment interval or dead zone adjustment interval the control variable is located in. When the control variable is in the first proportion adjustment interval, the difference value between the control variable and the pressure target value is larger, the conduction duration of the electromagnetic valve is relatively longer and reaches three fourths of the maximum power-on time, and meanwhile, the conduction interval time of the electromagnetic valve is shorter and is only one fourth of the maximum power-on time, so that the quick response and high-speed adjustment of the electromagnetic valve are realized; when the control variable is within the second proportional adjustment interval, the difference between the control variable and the pressure target value is reduced. The conduction duration of the electromagnetic valve is shortened to be one half of the maximum power-on time, meanwhile, the conduction interval time of the electromagnetic valve is only one half of the maximum power-on time, and compared with a first proportional adjustment interval, the response speed and the adjustment efficiency of the electromagnetic valve are further reduced; when the control variable is within the third proportional adjustment interval, the difference between the control variable and the pressure target value is further reduced. The conduction duration of the electromagnetic valve is shortened to be only one fourth of the maximum power-on time, meanwhile, the conduction interval time of the electromagnetic valve is only three fourths of the maximum power-on time, and compared with the second proportion adjusting interval, the response speed and the adjusting efficiency of the electromagnetic valve are further reduced. When the control variable is also located in the regulation range of the dead zone, the solenoid valve is then switched on for a duration of 0s, i.e. the solenoid valve is no longer switched on. Through the sectional adjustment, along with the fact that the control variable is closer to the target value, the adjustment speed and the response speed are gradually reduced, so that the electromagnetic valve can be rapidly adjusted in the early stage and finely adjusted in the later stage, and finally the electromagnetic valve is not adjusted in the dead zone range, so that the adjustment efficiency is ensured, the overshoot phenomenon is avoided, and the control accuracy and the control stability of the electromagnetic valve are ensured.
In this embodiment, step S2 specifically further includes:
and acquiring a control variable of the pressure of the helium screw compressor unit every 3s, acquiring the control variable of the pressure of the helium screw compressor unit every 3s, and when the calculated control variable exceeds the range of the dead zone adjustment interval, controlling and adjusting again according to the adjustment proportion interval where the control variable is positioned until the system returns to the target value again and continuously and stably operates.
In this embodiment, the modes of the helium screw compressor unit include a manual control mode and a system automatic control mode.
In summary, the progressive control method for the helium screw compressor unit provided by the application has the following advantages: 1. the pressure adjusting sections are respectively provided with a plurality of sections of adjusting sections, so that the problem of overlarge adjusting sections is avoided, the rapid adjustment can be realized when the control variable is far away from the target value, the fine adjustment is performed when the control variable is close to the target value, the gradual adjustment is realized, and the response speed and the stability of the system are ensured; 2. by adding the dead zone control function in the pressure regulation interval, when the difference value between the control variable and the target is in the dead zone range, the conduction duration of the electromagnetic valve is 0, and the system is not regulated, so that the optimal stabilization effect is achieved, and the exhaust pressure of the helium screw compressor unit is ensured to be stable for a long time; 3. the target value is changed from the traditional upper limit interval to the set point, once the control target is achieved, the system can be ensured to run in an optimal state, and the problem of positive and negative deviation can not occur; 4. the operating parameters can be modified according to the control system of the unit so as to match different system requirements.
The foregoing description is only illustrative of the present application and is not intended to limit the scope of the application, and all equivalent changes made by the specification and drawings of the present application, or direct or indirect application in the relevant art, are included in the scope of the present application.
Claims (7)
1. A progressive control method for a helium screw compressor unit, comprising the steps of:
s1: presetting a pressure target value and a pressure regulation interval of a helium screw compressor unit, and calculating according to the pressure regulation interval to obtain a regulation proportion area, wherein:
the pressure regulating interval is (K2, K1);
k1 is the upper pressure limit value, and K2 is the lower pressure limit value;
s2: acquiring a control variable of the pressure of the helium screw compressor unit;
s3: judging whether the control variable is in the pressure regulation interval, and confirming the conduction duration time of the electromagnetic valve and the energizing time of the electromagnetic valve according to the judging result, wherein the method comprises the following steps of:
if the control variable is not in the pressure regulation interval, setting the conduction duration of the electromagnetic valve as a preset maximum power-on time, and setting the conduction interval time of the electromagnetic valve as a preset minimum interval time;
if the control variable is not in the pressure regulation interval, calculating an absolute value Q of a difference value between the control variable and the pressure target value, setting the electromagnetic valve on duration to be decreased along with the decrease of the Q value, and setting the electromagnetic valve on interval time to be increased along with the decrease of the Q value.
2. A progressive control method for a helium screw compressor group according to claim 1, wherein step S1 further comprises:
presetting a section set value as K, and calculating to obtain a pressure regulation section according to the section set value and a pressure target value,
k1 =s-K, k2=s+k, S being the pressure target value.
3. A progressive control method for a helium screw compressor group according to claim 2, wherein step S1 further comprises:
the pressure regulation section comprises a dead zone regulation section, and the pressure target value is in the dead zone regulation section;
the dead zone adjustment interval is (K2 ', K1'), which is specifically as follows:
K2’＝S-K’，K1’＝S+K’；
proportional zone of regulation corresponding to dead zone
When the control variable is within the dead zone adjustment interval, the solenoid valve on duration is set to a preset minimum on time.
4. A progressive control method for a helium screw compressor group according to claim 3, wherein step S1 further comprises:
dividing the calculated regulation proportion area into a plurality of proportion regulation areas, and setting corresponding electromagnetic valve conduction duration and electromagnetic valve conduction interval time for each proportion regulation area.
5. A progressive control method for a helium screw compressor group according to claim 4, wherein step S1 further comprises:
dividing the calculated regulation proportion area into three proportion regulation areas, wherein the ranges of the three proportion regulation areas are respectively as follows:
the first proportion adjustment interval isOr->
The second proportion adjustment interval isOr->
The third proportion adjusting interval isOr->
When the control variable is within the first proportional adjustment interval,
when the control variable is within the second proportional adjustment interval,
when the control variable is within the third proportional adjustment interval,
wherein, T1 is the conduction duration of the electromagnetic valve, T2 is the conduction interval time of the electromagnetic valve, T1 is the preset maximum power-on time, and T2 is the preset maximum interval time.
6. A progressive control method for a helium gas screw compressor according to claim 5, wherein the preset maximum energizing time is 1s and the preset maximum interval time is 10s.
7. A progressive control method for a helium screw compressor group according to claim 1, wherein step S2 further comprises:
the control variable of the helium screw compressor group pressure is acquired every other cycle period, wherein the cycle period is set to 3s.
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| CN202310548549.3A CN116678147A (en) | 2023-05-16 | 2023-05-16 | Progressive control method for helium screw compressor unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117847872A (en) * | 2024-02-01 | 2024-04-09 | 中国科学院合肥物质科学研究院 | Control method for full-automatic operation of helium compressor system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117847872A (en) * | 2024-02-01 | 2024-04-09 | 中国科学院合肥物质科学研究院 | Control method for full-automatic operation of helium compressor system |
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