CN106403427B - A kind of control method of refrigeration system startup stage electric expansion valve - Google Patents
A kind of control method of refrigeration system startup stage electric expansion valve Download PDFInfo
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- CN106403427B CN106403427B CN201610784038.1A CN201610784038A CN106403427B CN 106403427 B CN106403427 B CN 106403427B CN 201610784038 A CN201610784038 A CN 201610784038A CN 106403427 B CN106403427 B CN 106403427B
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- expansion valve
- electronic expansion
- compressor
- superheat degree
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005057 refrigeration Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010726 refrigerant oil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
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- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
-
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The present invention relates to a kind of control methods of refrigeration system startup stage electric expansion valve.Including electric expansion valve and controller, it is characterized by: the rate of load condensate of compressor is divided into several rate of load condensate control points from 0%~100%, the electronic expansion valve opening percentage P set according to controller, the maximum step number A of electric expansion valve, minimum step number B, rate of load condensate control point Cn calculates current opening value Kn.Control method is as follows: starting refrigeration system compressor, persistently detect compressor load rate, when compressor load rate reaches the n-th control point value Cn, the aperture of expansion valve at this moment is calculated as Kn according to the n-th control point value Cn, by formula Kn=P × Cn × (A-B)+B: after delay T1, it is transferred to suction superheat control program, until compressor enters normal operating conditions.It is controlled by the electronic expansion valve opening of above-mentioned regulation process, reduces the appearance of compressor liquid hit phenomenon, loss caused by avoiding compressor due to liquid hammer improves the reliability and stability of system.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a control method of an electronic expansion valve at the starting stage of a refrigeration system.
Background
The control system of the electronic expansion valve of the water chilling unit is independently controlled by the suction superheat degree, the whole control logic only controls around the suction superheat degree, the system has excessive refrigerant or lubricating oil, the expansion valve has excessive opening degree, the evaporator has unstable heat load, the electronic expansion valve is quickly opened, or when the compressor is unloaded, the closing speed of the electronic expansion valve is too slow, the liquid impact phenomenon of the compressor can be caused, the liquid impact is frequent, the compressor is jammed if the compressor is light, partial parts are damaged, and the whole compressor is scrapped if the compressor is heavy.
Particularly, the superheat degree of the evaporator is zero when the refrigeration system starts, the system has a wide variation range and high speed, and the opening degree of the electronic expansion valve cannot be controlled according to the superheat degree. For a totally-enclosed compressor or a compressor with a gas-liquid separator before air suction, a small amount of liquid at an outlet of an evaporator is not harmful enough in a short time, but in the starting process, if two-phase refrigeration at the outlet of the evaporator directly enters a suction cavity of the compressor without other measures, the liquid impact phenomenon of the compressor can be caused. And even system damage.
Disclosure of Invention
The invention provides a control method of an electronic expansion valve in the starting stage of a refrigeration system, which can prevent the liquid impact of a compressor and aims to overcome the defects of the prior art.
The technical scheme for solving the technical problems is as follows: a control method of an electronic expansion valve in the starting stage of a refrigerating system comprises the electronic expansion valve and a controller, and also comprises the steps of detecting the suction superheat degree, the exhaust superheat degree and the load factor of a compressor, and is characterized in that:
dividing the load factor of the compressor from 0-100% into a plurality of load factor control points, wherein the percentage of the opening degree of the electronic expansion valve set by the controller is P, the maximum step number of the electronic expansion valve is A, the minimum step number of the electronic expansion valve is B, the numerical value of the load factor control point is Cn, and the calculated opening degree of the electronic expansion valve at the moment is Kn; wherein,
n is the serial number of the load rate control point; n is 1, 2, 3, … …;
the value range of P is as follows: p is 30 to 100 percent
The calculation formula of Kn is shown as formula (1), and the opening value is the opening control value of the electronic expansion valve.
Kn＝P×Cn×(A-B)+B………(1)
The control steps are as follows:
1) starting a compressor of the refrigeration system, detecting the load rate of the compressor, and when the load rate of the compressor reaches a first control point value C1, calculating the calculated opening degree of the electronic expansion valve at the moment according to the first control point value C1 of the load rate of the compressor and the formula (1) as K1:
(2) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree; automatically adjusting the opening degree of the expansion valve until the load factor of the compressor reaches a second control point value C2, and then, switching to the calculation of the opening degree of the electronic expansion valve at the moment as K2 according to the formula (1);
(3) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree;
(4) continuously detecting the load rate of the compressor, and when the load rate of the compressor reaches the nth control point numerical value Cn, calculating the calculated opening degree of the electronic expansion valve at the moment according to the nth control point numerical value Cn of the load rate of the compressor and the formula (1) to be Kn:
(5) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree;
(6) repeating the steps (4) and (5) until the compressor load factor Cn is 100%;
(7) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree;
(8) when the accumulated starting time of the compressor reaches T2, detecting the exhaust superheat degree, if the exhaust superheat degree is higher than the set temperature W1, continuing to execute a control program for adjusting the opening degree of the electronic expansion valve according to the suction superheat degree by the electronic expansion valve, and if the exhaust superheat degree is lower than W2; then the step (9) is carried out;
(9) and after delaying for a period of time T3, switching to a control program for adjusting the opening of the electronic expansion valve according to the exhaust superheat degree, setting an adjusting period T4, reducing N steps of the electronic expansion valve every time the period T4 passes until the exhaust superheat degree is higher than W1, and switching to the step (8) for operation.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the control program for adjusting the opening degree of the electronic expansion valve by the exhaust superheat degree is as follows: the W1 temperature in the step (8) is 20 ℃, and the W2 temperature is 18 ℃.
Further, the load factor control points of the compressor are sequentially selected from 25%, 50%, 75% and 100%.
Furthermore, the T1 is 5-10 seconds.
Further, the T2 is 150 seconds to 200 seconds; the T3 is 25 seconds to 35 seconds.
Further, the set adjustment period T4 is 2 seconds; and reducing the electronic expansion valve by N steps, wherein N is 3-5 steps.
The invention has the beneficial effects that: the opening control of the electronic expansion valve in the specified flow reduces the occurrence of the liquid impact phenomenon of the compressor, avoids the loss of the compressor caused by the liquid impact, and improves the reliability and the stability of the system.
Drawings
FIG. 1 is a block diagram of the present invention;
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a control method of an electronic expansion valve in a starting stage of a refrigeration system includes the electronic expansion valve and a controller, and further includes detecting a suction superheat degree, a discharge superheat degree and a compressor load factor, and is characterized in that:
dividing the load factor of the compressor from 0-100% into a plurality of load factor control points, wherein the percentage of the opening degree of the electronic expansion valve set by the controller is P, the maximum step number of the electronic expansion valve is A, the minimum step number of the electronic expansion valve is B, the numerical value of the load factor control point is Cn, and the calculated opening degree of the electronic expansion valve at the moment is Kn; wherein,
n is the serial number of the load rate control point; n is 1, 2, 3, … …;
the value range of P is as follows: p is 30-100%; preferably 50% is used.
The calculation formula of Kn is shown as formula (1), and the opening degree value is an opening degree control value of the electronic expansion valve, and the control value is transmitted to a stepping motor of the electronic expansion valve to adjust the opening degree of the electronic expansion valve.
Kn＝P×Cn×(A-B)+B………(1)
The control steps are as follows:
1) starting a compressor of the refrigeration system, detecting the load rate of the compressor, and when the load rate of the compressor reaches a first control point value C1, calculating the calculated opening degree of the electronic expansion valve at the moment according to the first control point value C1 of the load rate of the compressor and the formula (1) as K1:
(2) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree; automatically adjusting the opening degree of the expansion valve until the load factor of the compressor reaches a second control point value C2, and then, switching to the calculation of the opening degree of the electronic expansion valve at the moment as K2 according to the formula (1);
(3) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree;
(4) continuously detecting the load rate of the compressor, and when the load rate of the compressor reaches the nth control point numerical value Cn, calculating the calculated opening degree of the electronic expansion valve at the moment according to the nth control point numerical value Cn of the load rate of the compressor and the formula (1) to be Kn:
(5) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree;
(6) repeating the steps (4) and (5) until the compressor load factor Cn is 100%;
(7) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree;
(8) when the accumulated starting time of the compressor reaches T2, detecting the exhaust superheat degree, if the exhaust superheat degree is higher than the set temperature W1, continuing to execute a control program for adjusting the opening degree of the electronic expansion valve according to the suction superheat degree by the electronic expansion valve, and if the exhaust superheat degree is lower than W2; then the step (9) is carried out;
(9) and after delaying for a period of time T3, switching to a control program for adjusting the opening of the electronic expansion valve according to the exhaust superheat degree, setting an adjusting period T4, reducing N steps of the electronic expansion valve every time the period T4 passes until the exhaust superheat degree is higher than W1, and switching to the step (8) for operation.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the control program for adjusting the opening degree of the electronic expansion valve by the exhaust superheat degree is as follows: the W1 temperature in the step (8) is 20 ℃, and the W2 temperature is 18 ℃.
Further, the load factor control points of the compressor are sequentially selected from 25%, 50%, 75% and 100%.
Furthermore, the T1 is 5-10 seconds.
Further, the T2 is 150 seconds to 200 seconds; the T3 is 25 seconds to 35 seconds.
Further, the set adjustment period T4 is 2 seconds; and reducing the electronic expansion valve by N steps, wherein N is 3-5 steps.
Fig. 1 shows a control block diagram in which 25%, 50%, 75%, and 100% are selected in this order as the load factor control point of the compressor. The control program for adjusting the opening degree of the electronic expansion valve in accordance with the intake superheat degree will be referred to simply as an intake superheat degree control program. The corresponding Cn values are 0.25, 0.50, 0.75 and 1.00 in sequence. In this example, T1 is 10 seconds; t2 is 180 seconds; t3 was 30 seconds; t4 is 2 seconds and the corresponding electronic expansion valve step number N is 5 steps. The W1 is 20 ℃ and the W2 is 18 ℃.
The control system for the suction superheat degree and the exhaust superheat degree generally comprises an electronic expansion valve, a pressure sensor, a temperature sensor and a controller, wherein when the control system works, the controller detects the suction temperature of a suction pipeline and the exhaust temperature of an exhaust pipeline through the temperature sensor, the pressure sensor detects the saturated evaporation pressure of a suction end and the saturated condensation pressure of an exhaust end of a compressor, the controller calculates the suction superheat degree and the exhaust superheat degree after processing signals, and then outputs an instruction to act on a stepping motor of the electronic expansion valve to open the valve to a required position. To maintain the required liquid supply to the evaporator.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A control method of an electronic expansion valve in the starting stage of a refrigerating system comprises the electronic expansion valve and a controller, and also comprises the steps of detecting the suction superheat degree, the exhaust superheat degree and the load factor of a compressor, and is characterized in that:
dividing the load factor of the compressor from 0-100% into a plurality of load factor control points, wherein the percentage of the opening degree of the electronic expansion valve set by the controller is P, the maximum step number of the electronic expansion valve is A, the minimum step number of the electronic expansion valve is B, the numerical value of the load factor control point is Cn, and the calculated opening degree of the electronic expansion valve at the moment is Kn; wherein,
n is the serial number of the load rate control point; n is 1, 2, 3, … …;
the value range of P is as follows: p is 30 to 100 percent
Kn calculation formula is as formula (1)
Kn＝P×Cn×(A-B)+B………(1)
The control steps are as follows:
1) starting a compressor of the refrigeration system, detecting the load rate of the compressor, and when the load rate of the compressor reaches a first control point value C1, calculating the calculated opening degree of the electronic expansion valve at the moment according to the first control point value C1 of the load rate of the compressor and the formula (1) as K1:
(2) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree; automatically adjusting the opening degree of the expansion valve until the load factor of the compressor reaches a second control point value C2, and then, switching to the calculation of the opening degree of the electronic expansion valve at the moment as K2 according to the formula (1);
(3) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree;
(4) continuously detecting the load rate of the compressor, and when the load rate of the compressor reaches the nth control point numerical value Cn, calculating the calculated opening degree of the electronic expansion valve at the moment according to the nth control point numerical value Cn of the load rate of the compressor and the formula (1) to be Kn:
(5) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree;
(6) repeating the steps (4) and (5) until the compressor load factor Cn is 100%;
(7) after delaying for a period of time T1, switching to a control program for adjusting the opening of the electronic expansion valve according to the suction superheat degree;
(8) when the accumulated starting time of the compressor reaches T2, detecting the exhaust superheat degree, if the exhaust superheat degree is higher than the set temperature W1, continuing to execute a control program for adjusting the opening degree of the electronic expansion valve according to the suction superheat degree by the electronic expansion valve, and if the exhaust superheat degree is lower than W2; then the step (9) is carried out;
(9) and after delaying for a period of time T3, switching to a control program for adjusting the opening of the electronic expansion valve according to the exhaust superheat degree, setting an adjusting period T4, reducing N steps of the electronic expansion valve every time the period T4 passes until the exhaust superheat degree is higher than W1, and switching to the step (8) for operation.
2. The control method of the electronic expansion valve in the starting stage of the refrigeration system as recited in claim 1, wherein the control program of the opening degree of the exhaust superheat degree adjusting electronic expansion valve is as follows: the W1 temperature in the step (8) is 20 ℃, and the W2 temperature is 18 ℃.
3. The control method of the electronic expansion valve at the start-up stage of the refrigerating system of claim 1, wherein the load rate control point of the compressor is selected from 25%, 50%, 75% and 100% in sequence.
4. The control method of the electronic expansion valve in the starting stage of the refrigeration system as recited in claim 1, wherein the time T1 is 5-10 seconds.
5. The control method of the electronic expansion valve in the starting stage of the refrigeration system according to claim 1, wherein the T2 is 150 seconds to 200 seconds; the T3 is 25 seconds to 35 seconds.
6. The control method of the electronic expansion valve in the starting stage of the refrigeration system according to claim 1, wherein the setting adjustment period T4 is 2 seconds; and reducing the electronic expansion valve by N steps, wherein N is 3-5 steps.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107676922A (en) * | 2017-10-31 | 2018-02-09 | 广东美的暖通设备有限公司 | The control method and air conditioner of air conditioner |
| CN110006138B (en) * | 2019-03-01 | 2022-10-25 | 青岛海尔空调电子有限公司 | Control method and control system for preventing compressor of air conditioner from liquid impact |
| CN110926064B (en) * | 2019-12-10 | 2020-08-07 | 北京京仪自动化装备技术有限公司 | Control method and device of electronic expansion valve, electronic equipment and storage medium |
| CN112283868B (en) * | 2020-10-28 | 2022-07-08 | 广东Tcl智能暖通设备有限公司 | Air conditioner expansion valve control method, air conditioner and storage medium |
| CN112361633B (en) * | 2020-11-09 | 2024-07-16 | 珠海格力电器股份有限公司 | Refrigerating system and control method thereof |
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| CN105423498A (en) * | 2015-12-21 | 2016-03-23 | 珠海格力电器股份有限公司 | Control method of air conditioning system and air conditioning system |
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