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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- 238000005057 refrigeration Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003111 delayed effect Effects 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000009790 rate-determining step (RDS) Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 240000002853 Nelumbo nucifera Species 0.000 claims 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 2
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 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
-
- 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
-
- 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
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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
- 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
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 present invention relates to technical field of refrigeration equipment more particularly to a kind of controls of refrigeration system startup stage electric expansion valve
Method processed.
Background technique
Water cooler electronic expansion valve controls system is individually controlled by suction superheat, and entire control logic only surrounds air-breathing
Degree of superheat control, system refrigerant or lubricating oil are excessive, and expansion valve open degree is excessive, and evaporator thermic load is unstable, quickly open
Electric expansion valve is opened, or in compressor unloading, electric expansion valve closing velocity is excessively slow, is likely to cause the liquid of compressor
Phenomenon is hit, frequent liquid hammer gently then causes compressor stuck, and section components damage, heavy then entire compressor is scrapped.
It is zero that especially refrigeration system start-up course, which starts evaporator superheat, and system change range is big, and speed is fast, cannot
Electronic expansion valve opening is controlled according to the degree of superheat.For there is the compression of gas-liquid separator before totally-enclosed compressor or air-breathing
Machine, a small amount of band liquid is without much harm in short-term for evaporator outlet, but during startup, if evaporator outlet two-phase refrigeration without
Other measures are directly entered compressor air suction chamber, and it will cause compressor liquid hit phenomenons.Even result in system failure.
Summary of the invention
The present invention in view of the above shortcomings of the prior art, provides a kind of refrigeration system starting rank that can prevent compressor liquid hammer
The control method of section electric expansion valve.
The technical scheme to solve the above technical problems is that a kind of refrigeration system startup stage electric expansion valve
Control method, including electric expansion valve and controller further include detection suction superheat, discharge superheat and compressor load
Rate, it is characterised in that:
The rate of load condensate of compressor is divided into several rate of load condensate control points, the electronics of controller setting from 0%~100%
Expansion valve opening percentage is P, and the maximum step number of electric expansion valve is A, and minimum step number is B, and the numerical value at rate of load condensate control point is
Cn, the calculating aperture of electric expansion valve at this moment are Kn；Wherein,
N is the serial number at rate of load condensate control point；N=1,2,3 ...；
The value range of P are as follows: P=30%~100%
Kn calculation formula such as formula (1), the opening value are electronic expansion valve opening controlling value.
Kn=P × Cn × (A-B)+B ... ... (1)
Rate-determining steps are as follows:
1), start refrigeration system compressor, detect compressor load rate, when compressor load rate reaches the first control points
When value C1, according to the first of compressor load rate the control point value C1, calculate by formula (1) electric expansion valve at this moment based on
Calculation aperture is K1:
(2), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
I.e. adjust automatically expansion valve opening reaches the second control point value C2 until the rate of load condensate of compressor, is transferred to again by above-mentioned at this time
It is K2 that formula (1), which calculates the calculating aperture of electric expansion valve at this moment,；
(3), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
(4), compressor load rate is persistently detected, when compressor load rate reaches the n-th control point value Cn, according to compression
N-th control point value Cn of machine rate of load condensate, the calculating aperture of electric expansion valve at this moment is calculated as Kn by formula (1):
(5), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
(6), (4) and (5) step are repeated until compressor load rate is Cn=100%；
(7), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
(8), when compressor, which adds up the available machine time, reaches T2, discharge superheat is detected, if discharge superheat is higher than setting
Temperature W1, electric expansion valve continues to execute the control program that electronic expansion valve opening is adjusted according to suction superheat, if being vented
Temperature is lower than W2；Then it is transferred to step (9)；
(9), it is delayed after a period of time T3 again, is transferred to the control journey for adjusting electronic expansion valve opening according to discharge superheat
Sequence, and adjustment cycle T 4 is set, it is every to pass through cycle T 4, reduce electric expansion valve N step and then turns until discharge superheat is higher than W1
Enter step (8) operation.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the control program of the discharge superheat adjustment electronic expansion valve opening is: W1 described in step (8) is
20 DEG C, W2 is 18 DEG C of
Further, the rate of load condensate control point of the compressor successively selects 25%, 50%, 75% and 100%.
Further, the T1 is 5~10 seconds.
Further, the T2 is 150 seconds~200 seconds；The T3 is 25 seconds~35 seconds
Further, the setting adjustment cycle T 4 is 2 seconds；The reduction electric expansion valve N step, wherein N is 3~5 steps.
The beneficial effects of the present invention are: reducing compressor liquid hammer by the electronic expansion valve opening control of regulation process
The appearance of phenomenon, loss caused by avoiding compressor due to liquid hammer, improves the reliability and stability of system.
Detailed description of the invention
Fig. 1 is structure of the invention block diagram；
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
As shown in Figure 1, a kind of control method of refrigeration system startup stage electric expansion valve, including electric expansion valve and control
Device processed further includes detection suction superheat, discharge superheat and compressor load rate, it is characterised in that:
The rate of load condensate of compressor is divided into several rate of load condensate control points, the electronics of controller setting from 0%~100%
Expansion valve opening percentage is P, and the maximum step number of electric expansion valve is A, and minimum step number is B, and the numerical value at rate of load condensate control point is
Cn, the calculating aperture of electric expansion valve at this moment are Kn；Wherein,
N is the serial number at rate of load condensate control point；N=1,2,3 ...；
The value range of P are as follows: P=30%~100%；Preferably use 50%.
Kn calculation formula such as formula (1), the opening value are electronic expansion valve opening controlling value, which is conveyed to electricity
The stepper motor of sub- expansion valve, to adjust the aperture of electric expansion valve.
Kn=P × Cn × (A-B)+B ... ... (1)
Rate-determining steps are as follows:
1), start refrigeration system compressor, detect compressor load rate, when compressor load rate reaches the first control points
When value C1, according to the first of compressor load rate the control point value C1, calculate by formula (1) electric expansion valve at this moment based on
Calculation aperture is K1:
(2), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
I.e. adjust automatically expansion valve opening reaches the second control point value C2 until the rate of load condensate of compressor, is transferred to again by above-mentioned at this time
It is K2 that formula (1), which calculates the calculating aperture of electric expansion valve at this moment,；
(3), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
(4), compressor load rate is persistently detected, when compressor load rate reaches the n-th control point value Cn, according to compression
N-th control point value Cn of machine rate of load condensate, the calculating aperture of electric expansion valve at this moment is calculated as Kn by formula (1):
(5), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
(6), (4) and (5) step are repeated until compressor load rate is Cn=100%；
(7), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
(8), when compressor, which adds up the available machine time, reaches T2, discharge superheat is detected, if discharge superheat is higher than setting
Temperature W1, electric expansion valve continues to execute the control program that electronic expansion valve opening is adjusted according to suction superheat, if being vented
Temperature is lower than W2；Then it is transferred to step (9)；
(9), it is delayed after a period of time T3 again, is transferred to the control journey for adjusting electronic expansion valve opening according to discharge superheat
Sequence, and adjustment cycle T 4 is set, it is every to pass through cycle T 4, reduce electric expansion valve N step and then turns until discharge superheat is higher than W1
Enter step (8) operation.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the control program of the discharge superheat adjustment electronic expansion valve opening is: W1 described in step (8) is
20 DEG C, W2 is 18 DEG C of
Further, the rate of load condensate control point of the compressor successively selects 25%, 50%, 75% and 100%.
Further, the T1 is 5~10 seconds.
Further, the T2 is 150 seconds~200 seconds；The T3 is 25 seconds~35 seconds
Further, the setting adjustment cycle T 4 is 2 seconds；The reduction electric expansion valve N step, wherein N is 3~5 steps.
Fig. 1 shows the controls that the rate of load condensate control point of the compressor successively selects 25%, 50%, 75% and 100%
Block diagram.The control program for adjusting electronic expansion valve opening according to suction superheat is wherein referred to as suction superheat control journey
Sequence.Corresponding Cn value is followed successively by 0.25,0.50,0.75 and 1.00.In this example, T1 is 10 seconds；T2 is 180 seconds；T3 is 30
Second；T4 is 2 seconds, and corresponding electric expansion valve step number N is 5 steps.The W1 is 20 DEG C, and W2 is 18 DEG C.
Above-mentioned suction superheat and discharge superheat control system generally comprise electric expansion valve, pressure sensor, temperature
Sensor, controller composition, when work, suction temperature and exhaust pipe that controller passes through temperature sensor detection suction pipe
Delivery temperature, pressure sensor detect compressor suction end saturation evaporating pressure and exhaust end saturation condensing pressure,
Controller after signal processing, will calculate suction superheat and discharge superheat, and subsequent output order acts on electric expansion valve
Stepper motor, valve is reached to the position of needs.With the liquid supply rate for keeping evaporator to need.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of control method of refrigeration system startup stage electric expansion valve, including electric expansion valve and controller, further include
Detect suction superheat, discharge superheat and compressor load rate, it is characterised in that:
The rate of load condensate of compressor is divided into several rate of load condensate control points, the electronic expansion of controller setting from 0%~100%
Valve opening percentage is P, and the maximum step number of electric expansion valve is A, and minimum step number is B, and the numerical value at rate of load condensate control point is Cn, electricity
The calculating aperture of sub- expansion valve at this moment is Kn；Wherein,
N is the serial number at rate of load condensate control point；N=1,2,3 ...；
The value range of P are as follows: P=30%~100%
Kn calculation formula such as formula (1)
Kn=P × Cn × (A-B)+B ... ... (1)
Rate-determining steps are as follows:
1), start refrigeration system compressor, compressor load rate is detected, when compressor load rate reaches the first control point value C1
When, according to the first of compressor load rate the control point value C1, the calculating of electric expansion valve at this moment is calculated by formula (1) open
Degree is K1:
(2), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；I.e. certainly
Dynamic adjustment expansion valve opening reaches the second control point value C2 until the rate of load condensate of compressor, is transferred to again by above-mentioned formula at this time
(1) calculating the calculating aperture of electric expansion valve at this moment is K2；
(3), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
(4), compressor load rate is persistently detected, it is negative according to compressor when compressor load rate reaches the n-th control point value Cn
N-th control point value Cn of lotus rate, the calculating aperture of electric expansion valve at this moment is calculated as Kn by formula (1):
(5), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
(6), (4) and (5) step are repeated until compressor load rate is Cn=100%；
(7), it is delayed after a period of time T1, is transferred to the control program for adjusting electronic expansion valve opening according to suction superheat；
(8), when compressor, which adds up the available machine time, reaches T2, discharge superheat is detected, if discharge superheat is higher than set temperature
W1, electric expansion valve continues to execute the control program that electronic expansion valve opening is adjusted according to suction superheat, if discharge superheat
Lower than W2；Then it is transferred to step (9)；
(9), it is delayed after a period of time T3 again, is transferred to the control program for adjusting electronic expansion valve opening according to discharge superheat, and
Setting adjustment cycle T 4, it is every to pass through cycle T 4, reduce electric expansion valve N step until discharge superheat is higher than W1 and is then transferred to step
(8) it runs.
2. the control method of refrigeration system startup stage electric expansion valve according to claim 1, which is characterized in that described
The control program of discharge superheat adjustment electronic expansion valve opening is: W1 described in step (8) is 20 DEG C, and W2 is 18 DEG C.
3. the control method of refrigeration system startup stage electric expansion valve according to claim 1, which is characterized in that described
The rate of load condensate control point of compressor successively selects 25%, 50%, 75% and 100%.
4. the control method of refrigeration system startup stage electric expansion valve according to claim 1, which is characterized in that described
T1 is 5~10 seconds.
5. the control method of refrigeration system startup stage electric expansion valve according to claim 1, which is characterized in that described
T2 is 150 seconds~200 seconds；The T3 is 25 seconds~35 seconds.
6. the control method of refrigeration system startup stage electric expansion valve according to claim 1, which is characterized in that described
Setting adjustment cycle T 4 is 2 seconds；The reduction electric expansion valve N step, wherein N is 3~5 steps.
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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 |
| CN112361633A (en) * | 2020-11-09 | 2021-02-12 | 珠海格力电器股份有限公司 | Refrigeration system and control method thereof |
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