CN112361633A - Refrigeration system and control method thereof - Google Patents
Refrigeration system and control method thereof Download PDFInfo
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- CN112361633A CN112361633A CN202011241640.3A CN202011241640A CN112361633A CN 112361633 A CN112361633 A CN 112361633A CN 202011241640 A CN202011241640 A CN 202011241640A CN 112361633 A CN112361633 A CN 112361633A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005057 refrigeration Methods 0.000 title claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims abstract description 64
- 230000001276 controlling effect Effects 0.000 claims description 31
- 239000003507 refrigerant Substances 0.000 claims description 7
- 230000002035 prolonged effect Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- 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
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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
- F25B49/022—Compressor control arrangements
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
- F25B2400/0751—Details of compressors or related parts with parallel compressors the compressors having different capacities
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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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0251—Compressor control by controlling speed with on-off operation
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a refrigeration system and a control method thereof, wherein the system comprises: a first compressor and a second compressor arranged in parallel; one end of the first load regulating valve is connected with an exhaust port of the first compressor, and the other end of the first load regulating valve is connected with an air suction port of the second compressor; one end of the second load regulating valve is connected with the air suction port of the first compressor, and the other end of the second load regulating valve is connected with the air exhaust port of the second compressor; the first load regulating valve and the second load regulating valve are used for regulating the suction and exhaust pressure of the first compressor and the second compressor; and before the first compressor is in an operating state and the second compressor is started, the first load regulating valve and the second load regulating valve are started, and pressure difference is established between the air suction port and the air discharge port of the second compressor through the pressure of the air discharge port and the air suction port of the first compressor to push the rotor of the second compressor to rotate. The invention solves the problems that the starting current of the compressor is large and the current impact damage is easy to cause in the prior art, and prolongs the service life of the compressor.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigeration system and a control method thereof.
Background
At present, in the start-stop control of a compressor of refrigeration equipment, the compressor carries out start-stop control according to the setting and detection of target parameters.
When the motor is started and powered on, the rotor of the motor is adjusted to a motion state from a standing state within a short time, and at the moment, the starting current is large, so that the motor causes instantaneous large-current impact. Except that the starting process can cause the current impact of a motor of the compressor, the user needs to use cold load demand, so that the running demand of a small load can be frequently met, or the load demand is fluctuated greatly, the compressor needs to be frequently started and stopped, and the problems of oil shortage in the running of the compressor and the like are caused when the starting and stopping times are too many.
Aiming at the problems that the starting current of the compressor is large and the current impact damage is easily caused in the related technology, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a refrigerating system and a control method thereof, which at least solve the problems that the starting current of a compressor is large and the current impact damage is easily caused in the prior art.
To solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided a refrigeration system including: the compressor, the condenser, the electronic expansion valve and the evaporator are connected in sequence; the compressor comprises a first compressor and a second compressor which are arranged in parallel; one end of the first load regulating valve is connected with an exhaust port of the first compressor, and the other end of the first load regulating valve is connected with an air suction port of the second compressor; one end of the second load regulating valve is connected with the air suction port of the first compressor, and the other end of the second load regulating valve is connected with the air exhaust port of the second compressor; the first load regulating valve and the second load regulating valve are used for regulating the suction and exhaust pressure of the first compressor and the second compressor; and before the first compressor is in an operating state and the second compressor is started, the first load regulating valve and the second load regulating valve are started, and pressure difference is established between the air suction port and the air discharge port of the second compressor through the pressure of the air discharge port and the air suction port of the first compressor to push the rotor of the second compressor to rotate.
Further, still include: the first exhaust valve is positioned at the exhaust port of the first compressor and used for controlling the first compressor to exhaust; the second exhaust valve is positioned at the exhaust port of the second compressor and used for controlling the second compressor to exhaust; wherein the first and second exhaust valves are opened after the first and second load adjusting valves are opened.
Further, the second compressor further includes: and an unloading solenoid valve for opening before the first and second load adjusting valves are opened to unload the pressure of the second compressor.
Further, the condenser comprises a first condenser and a second condenser; the exhaust port of the first compressor is connected with the first condenser, and the exhaust port of the second compressor is connected with the second condenser; the electronic expansion valve includes: a first electronic expansion valve and a second electronic expansion valve; the first electronic expansion valve is positioned between the first condenser and the evaporator, and the second electronic expansion valve is positioned between the second condenser and the evaporator.
When the pressure of the first compressor is unloaded to the minimum value and the second compressor is stopped, the first load adjusting valve and the second load adjusting valve are opened, the second exhaust valve is opened and closed, the second electronic expansion valve is opened, so that the refrigerant discharged from the exhaust port of the first compressor releases heat through the second electronic expansion valve and the evaporator, enters the second condenser, reaches the exhaust port of the second compressor, and then enters the suction port of the first compressor.
According to another aspect of the embodiments of the present invention, there is provided a refrigeration system control method including: after the pressure of the first compressor is loaded to the maximum value, detecting whether the refrigerating system can meet the load requirement; if the load requirements cannot be met, controlling the first load regulating valve and the second load regulating valve to open; after the first and second load adjusting valves are opened, the second compressor is controlled to be opened.
Further, before controlling the first load regulating valve and the second load regulating valve to be opened, the method further comprises the following steps: determining the unloading time of the unloading electromagnetic valve according to the operating parameters of the second compressor; and controlling the unloading solenoid valve to open the unloading time to unload the pressure of the second compressor to the minimum value.
Further, controlling the first load regulating valve and the second load regulating valve to open includes: controlling the opening degrees of the first load regulating valve and the second load regulating valve to the maximum value; after the first load adjusting valve and the second load adjusting valve are opened, the method further comprises the following steps: and controlling the opening of the first exhaust valve and the second exhaust valve.
Further, still include: when the pressure of the first compressor is unloaded to the minimum value and the second compressor is stopped, the first load adjusting valve and the second load adjusting valve are controlled to be opened, the second exhaust valve is controlled to be opened and closed, and the second electronic expansion valve is controlled to be opened.
Further, controlling the first load regulating valve and the second load regulating valve to open includes: determining opening values of the first load regulating valve and the second load regulating valve according to a difference value between the current load and the load demand of the system; and controlling the first load regulating valve and the second load regulating valve to the opening value.
According to yet another aspect of an embodiment of the present invention, there is provided a storage medium containing computer executable instructions for performing a refrigeration system control method as described above when executed by a computer processor.
In the invention, the two compressor load allocation control schemes are adopted, the exhaust pipeline and the air suction pipeline of one running compressor are communicated with the air suction pipeline and the exhaust pipeline of the shutdown compressor, and the compressor rotor is pushed to rotate in advance in a pneumatic mode before the shutdown compressor is started, so that the starting current of the compressor is reduced, the current impact of the starting and stopping of the compressor motor is reduced, and the service life of the compressor is prolonged.
Drawings
FIG. 1 is a schematic diagram of an alternative configuration of a refrigeration system according to an embodiment of the present invention;
fig. 2 is an alternative flow chart of a refrigerant system control method according to an embodiment of the present invention.
Description of reference numerals:
1. a first compressor; 2. a second compressor; 3. an evaporator; 4. a first load regulating valve; 5. a second load regulating valve; 6. a first exhaust valve; 7. a second exhaust valve; 8. a first condenser; 9. a second condenser; 10. a first electronic expansion valve; 11. a second electronic expansion valve; 12. a first dry filter; 13. and a second dry filter.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
In a preferred embodiment 1 of the present invention, a refrigeration system is provided, and in particular, fig. 1 shows an alternative schematic configuration of the system, as shown in fig. 1, the system comprising:
a compressor, a condenser, an electronic expansion valve and an evaporator 3 which are connected in sequence;
the compressor comprises a first compressor 1 and a second compressor 2 which are arranged in parallel;
a first load control valve 4, one end of which is connected with the exhaust port of the first compressor 1 and the other end of which is connected with the suction port of the second compressor 2;
a second load control valve 5 having one end connected to the suction port of the first compressor 1 and the other end connected to the discharge port of the second compressor 2;
the first load adjusting valve 4 and the second load adjusting valve 5 are used for adjusting the suction and exhaust pressures of the first compressor 1 and the second compressor 2; wherein, before the first compressor 1 is in operation state and the second compressor 2 is opened, the first load adjusting valve 4 and the second load adjusting valve 5 are opened, and a pressure difference is established between the suction port and the exhaust port of the second compressor 2 by the pressure of the exhaust port and the suction port of the first compressor 1, so as to push the rotor of the second compressor 2 to rotate.
In the above embodiment, two compressor load allocation control schemes are adopted, the exhaust pipeline and the suction pipeline of one running compressor are communicated with the suction pipeline and the exhaust pipeline of the shutdown compressor, and the compressor rotor is pushed to rotate in advance in a pneumatic mode before the shutdown compressor is started, so that the starting current of the compressor is reduced, the current impact of starting and stopping the compressor motor is reduced, and the service life of the compressor is prolonged.
As shown in fig. 1, a first dry filter 12 and a second dry filter 13 are further included between the condenser and the evaporator 3; further included at the first compressor 1 and the second compressor 2 are: the first exhaust valve 6 is positioned at an exhaust port of the first compressor 1 and used for controlling the first compressor 1 to exhaust; the second exhaust valve 7 is positioned at the exhaust port of the second compressor 2 and used for controlling the second compressor 2 to exhaust; wherein the first exhaust valve 6 and the second exhaust valve 7 are opened after the first load regulating valve 4 and the second load regulating valve 5 are opened.
Wherein the second compressor 2 further comprises: and an unloading solenoid valve for opening before the first and second load adjusting valves 4 and 5 are opened to unload the pressure of the second compressor 2.
The load regulating valve is arranged at the air suction and exhaust ports of the two compressors, and is used for correspondingly exhausting the air suction of the two compressors and connecting the air suction with the corresponding air suction. When one of the compressors I (corresponding to the first compressor 1) is loaded to the highest capacity according to the load requirement, and the compressor II (corresponding to the second compressor 2) needs to be started, the unloading electromagnetic valve of the stopped compressor II is firstly opened, and the compressor is kept at the lowest load at the moment. The time for electrifying the unloading electromagnetic valve is set according to the parameters of different compressors. After the unloading electromagnetic valve is electrified, the air suction and exhaust load adjusting valve is opened to the maximum, the first exhaust valve 6 and the second exhaust valve 7 are opened, the exhaust of the running compressor I is conducted to the air suction pipe of the compressor II, and the air suction of the running compressor I is conducted to the exhaust pipe of the compressor II. The suction gas of the compressor forms high pressure, the exhaust gas forms low pressure, so that the refrigerant gas flow enters the suction gas of the compressor II from the exhaust gas of the compressor I, enters the interior of the compressor II to reach the exhaust gas under the action of pressure difference, and then enters the suction gas of the compressor I. In the process, the rotor of the second compressor is pushed by the airflow to rotate in advance, so that the starting torque of the next second compressor after the motor is electrified is reduced, the starting current of the second compressor is reduced, and the impact on the motor is reduced.
As shown in fig. 1, the condenser includes a first condenser 8 and a second condenser 9; the exhaust port of the first compressor 1 is connected with a first condenser 8, and the exhaust port of the second compressor 2 is connected with a second condenser 9; the electronic expansion valve includes: a first electronic expansion valve 10 and a second electronic expansion valve 11; wherein a first electronic expansion valve 10 is located between the first condenser 8 and the evaporator 3 and a second electronic expansion valve 11 is located between the second condenser 9 and the evaporator 3.
In addition, the problem still exists in the compressor operation in-process, because with the cold load demand of user, the less load operation demand often appears, or load demand fluctuation by a wide margin leads to frequently opening and stopping the compressor, and open and stop the too much and bring the compressor operation to lack oil scheduling problem simultaneously.
In order to solve the above problem, when the pressure of the first compressor 1 is unloaded to the minimum value and the second compressor 2 is stopped, the first load regulating valve 4 and the second load regulating valve 5 are opened, the second exhaust valve 7 is opened and closed, the second electronic expansion valve 11 is opened, so that the refrigerant discharged from the exhaust port of the first compressor 1 releases heat through the second electronic expansion valve 11 and the evaporator 3, enters the second condenser 9 to reach the exhaust port of the second compressor 2, and then enters the suction port of the first compressor 1.
Specifically, when one of the first compressors is unloaded to the minimum capacity and cannot be adjusted according to the load demand, the second compressor is stopped at the moment. And opening the suction and exhaust load regulating valve to open and control the valve to close or open, closing the exhaust valve of the second compressor, opening the electronic expansion valve of the second compressor, conducting the exhaust of the first compressor in operation to the suction pipe of the second compressor, and conducting the suction of the first compressor in operation to the exhaust pipe of the second compressor. At this time, the suction of the compressor forms high pressure, the exhaust forms low pressure, but the exhaust valve of the second compressor is closed, and the electronic expansion valve of the second compressor is opened. The refrigerant airflow is discharged from the exhaust of the first compressor through the evaporator 3 of the electronic expansion valve of the second compressor, then changed into liquid, enters the condenser of the second compressor to exhaust the air under the action of pressure difference, and then enters the suction of the first compressor.
In the process, normal exhaust gas of the first compressor is partially separated, and the refrigerating capacity is reduced. Meanwhile, a part of the separated exhaust gas enters the evaporator 3 to dissipate heat, so that a part of refrigerating capacity is consumed, the aim of reducing the refrigerating capacity without turning off the compressor is fulfilled, and the compressor is prevented from being started and stopped frequently.
The exhaust pipeline and the suction pipeline of the compressor in operation are communicated with the suction pipe and the exhaust pipe of the shutdown compressor, so that the load of the compressor in operation can be further reduced, or the rotor of the compressor is pushed to rotate in advance in a pneumatic mode before the shutdown compressor is started, and the compressor is prevented from being started and stopped frequently, and the starting current of the compressor is reduced.
Example 2
In a preferred embodiment 2 of the present invention, there is provided a refrigeration system control method applied to the refrigeration system in the above-described embodiment 1. In particular, fig. 2 shows an alternative flow chart of the method, which, as shown in fig. 2, comprises the following steps S202-S206:
s202: after the pressure of the first compressor is loaded to the maximum value, detecting whether the refrigerating system can meet the load requirement;
s204: if the load requirements cannot be met, controlling the first load regulating valve and the second load regulating valve to open;
s206: after the first and second load adjusting valves are opened, the second compressor is controlled to be opened.
In the above embodiment, two compressor load allocation control schemes are adopted, the exhaust pipeline and the suction pipeline of one running compressor are communicated with the suction pipeline and the exhaust pipeline of the shutdown compressor, and the compressor rotor is pushed to rotate in advance in a pneumatic mode before the shutdown compressor is started, so that the starting current of the compressor is reduced, the current impact of starting and stopping the compressor motor is reduced, and the service life of the compressor is prolonged.
Before controlling first load governing valve and second load governing valve to open, still include: determining the unloading time of the unloading electromagnetic valve according to the operating parameters of the second compressor; and controlling the unloading solenoid valve to open the unloading time to unload the pressure of the second compressor to the minimum value.
Because the system can not satisfy the load demand, control first load governing valve and second load governing valve and open, include: controlling the opening degrees of the first load regulating valve and the second load regulating valve to the maximum value; after the first load adjusting valve and the second load adjusting valve are opened, the method further comprises the following steps: and controlling the opening of the first exhaust valve and the second exhaust valve.
The scheme is used for controlling the compressor to be stopped and the rotor of the compressor is pushed to rotate in advance in a pneumatic mode before the compressor is started, so that the starting current of the compressor is reduced. In addition, the present invention further comprises: when the pressure of the first compressor is unloaded to the minimum value and the second compressor is stopped, the first load adjusting valve and the second load adjusting valve are controlled to be opened, the second exhaust valve is controlled to be opened and closed, and the second electronic expansion valve is controlled to be opened. The exhaust pipeline and the suction pipeline of one running compressor are communicated with the suction and exhaust pipe of the shutdown compressor, so that the load of the running compressor can be further reduced, and the compressor is prevented from being frequently started and stopped.
Preferably, controlling the first and second load adjusting valves to be open includes: determining opening values of the first load regulating valve and the second load regulating valve according to a difference value between the current load and the load demand of the system; and controlling the first load regulating valve and the second load regulating valve to the opening value.
In conclusion, the invention aims at the double-compressor refrigeration system, the load of the two compressors is allocated according to the actual temperature and pressure parameters during the starting and running periods, the control scheme is adopted, the problems of large starting current of the compressors and frequent starting of the compressors are solved, the long-time running of the compressors is kept, and the service life of the compressors is prolonged.
Example 3
Based on the refrigeration system control method provided in embodiment 2 above, there is also provided in preferred embodiment 3 of the present invention a storage medium containing computer executable instructions for performing the refrigeration system control method as described above when executed by a computer processor.
In the above embodiment, two compressor load allocation control schemes are adopted, the exhaust pipeline and the suction pipeline of one running compressor are communicated with the suction pipeline and the exhaust pipeline of the shutdown compressor, and the compressor rotor is pushed to rotate in advance in a pneumatic mode before the shutdown compressor is started, so that the starting current of the compressor is reduced, the current impact of starting and stopping the compressor motor is reduced, and the service life of the compressor is prolonged.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (11)
1. A refrigeration system, comprising:
a compressor, a condenser, an electronic expansion valve and an evaporator (3) which are connected in sequence;
the compressor comprises a first compressor (1) and a second compressor (2) which are arranged in parallel;
a first load adjusting valve (4) with one end connected with the exhaust port of the first compressor (1) and the other end connected with the air suction port of the second compressor (2);
a second load regulating valve (5) having one end connected to the suction port of the first compressor (1) and the other end connected to the discharge port of the second compressor (2);
the first load adjusting valve (4) and the second load adjusting valve (5) are used for adjusting the suction and exhaust pressure of the first compressor (1) and the second compressor (2); wherein, before the first compressor (1) is in a running state and the second compressor (2) is opened, the first load adjusting valve (4) and the second load adjusting valve (5) are opened, and a pressure difference is established between the air inlet and the air outlet of the second compressor (2) through the pressure of the air outlet and the air inlet of the first compressor (1) to push the rotor of the second compressor (2) to rotate.
2. The system of claim 1, further comprising:
the first exhaust valve (6) is positioned at the exhaust port of the first compressor (1) and used for controlling the first compressor (1) to exhaust;
the second exhaust valve (7) is positioned at the exhaust port of the second compressor (2) and is used for controlling the second compressor (2) to exhaust;
wherein the first exhaust valve (6) and the second exhaust valve (7) are opened after the first load regulating valve (4) and the second load regulating valve (5) are opened.
3. The system according to claim 1, wherein the second compressor (2) further comprises: and the unloading electromagnetic valve is used for opening before the first load regulating valve (4) and the second load regulating valve (5) are opened, and unloading the pressure of the second compressor (2).
4. The system of claim 2,
the condenser comprises a first condenser (8) and a second condenser (9); the exhaust port of the first compressor (1) is connected with the first condenser (8), and the exhaust port of the second compressor (2) is connected with the second condenser (9);
the electronic expansion valve includes: a first electronic expansion valve (10) and a second electronic expansion valve (11); wherein the first electronic expansion valve (10) is located between the first condenser (8) and the evaporator (3), and the second electronic expansion valve (11) is located between the second condenser (9) and the evaporator (3).
5. The system according to claim 4, wherein when the pressure of the first compressor (1) is unloaded to a minimum value and the second compressor (2) is stopped, the first load regulating valve (4) and the second load regulating valve (5) are opened, the second exhaust valve (7) is opened and closed, the second electronic expansion valve (11) is opened, and after the refrigerant discharged from the exhaust port of the first compressor (1) releases heat through the second electronic expansion valve (11) and the evaporator (3), the refrigerant enters the second condenser (9) to reach the exhaust port of the second compressor (2) and then enters the suction port of the first compressor (1).
6. A refrigeration system control method, comprising:
after the pressure of the first compressor is loaded to the maximum value, detecting whether the refrigerating system can meet the load requirement;
if the load demand cannot be met, controlling the first load regulating valve and the second load regulating valve to open;
controlling a second compressor to be turned on after the first and second load adjusting valves are turned on.
7. The method of claim 6, further comprising, prior to controlling the first and second load regulating valves to open:
determining the unloading time of an unloading electromagnetic valve according to the operating parameters of the second compressor;
and controlling the unloading solenoid valve to open the unloading time to unload the pressure of the second compressor to the minimum value.
8. The method of claim 6,
the controlling of the opening of the first load adjusting valve and the second load adjusting valve includes: controlling the opening degrees of the first load regulating valve and the second load regulating valve to a maximum value;
after the first load adjusting valve and the second load adjusting valve are opened, the method further comprises the following steps:
and controlling the opening of the first exhaust valve and the second exhaust valve.
9. The method of claim 6, further comprising:
when the pressure of the first compressor is unloaded to the minimum value and the second compressor is stopped, the first load adjusting valve and the second load adjusting valve are controlled to be opened, and meanwhile, a second exhaust valve is controlled to be opened and closed, and a second electronic expansion valve is controlled to be opened.
10. The method of claim 9, wherein said controlling said first and second load regulator valves to open comprises:
determining opening values of the first load regulating valve and the second load regulating valve according to a difference value of the current load of the system and the load demand;
controlling the first load regulating valve and the second load regulating valve to the opening value.
11. A storage medium containing computer executable instructions for performing a refrigeration system control method as recited in any one of claims 6 through 10 when executed by a computer processor.
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| CN202011241640.3A CN112361633B (en) | 2020-11-09 | 2020-11-09 | Refrigerating system and control method thereof |
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| CN202011241640.3A CN112361633B (en) | 2020-11-09 | 2020-11-09 | Refrigerating system and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251682A (en) * | 2021-06-09 | 2021-08-13 | 依米康冷元节能科技（上海）有限公司 | Double-head compressor regulation and control method, device, equipment and storage medium |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2341089Y (en) * | 1998-05-08 | 1999-09-29 | 冯海芃 | Decompression starting device of refrigerating system compressor |
| US20050066673A1 (en) * | 2001-04-05 | 2005-03-31 | Bristol Compressors, Inc. | Pressure equalization system |
| EP1600630A2 (en) * | 2004-05-27 | 2005-11-30 | Leobersdorfer Maschinenfabrik AG | Multistage gas compressor and its control method |
| KR20060077218A (en) * | 2004-12-30 | 2006-07-05 | 엘지전자 주식회사 | Driving control method of the hot gas bypass valve of an airconditioner |
| JP2015074336A (en) * | 2013-10-09 | 2015-04-20 | 新庄自動車株式会社 | Vehicle control device |
| US20160265815A1 (en) * | 2013-12-12 | 2016-09-15 | Johnson Controls Technology Company | Steam turbine driven centrifugal heat pump |
| CN106403427A (en) * | 2016-08-31 | 2017-02-15 | 烟台欧森纳地源空调股份有限公司 | Control method for electronic expansion valve in starting stage of refrigeration system |
| CN208846785U (en) * | 2018-08-27 | 2019-05-10 | 上海兆雪冷冻设备有限公司 | A kind of multimachine list twin-stage is mixed to beat net for air-source heat pump units |
| CN110671833A (en) * | 2018-07-03 | 2020-01-10 | 广东美芝制冷设备有限公司 | Compressor and refrigerating system |
| CN111854119A (en) * | 2020-07-21 | 2020-10-30 | 珠海格力电器股份有限公司 | Stepless regulation control method for load output of water chilling unit and water chilling unit |
| CN214039021U (en) * | 2020-11-09 | 2021-08-24 | 珠海格力电器股份有限公司 | Refrigeration system |
-
2020
- 2020-11-09 CN CN202011241640.3A patent/CN112361633B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2341089Y (en) * | 1998-05-08 | 1999-09-29 | 冯海芃 | Decompression starting device of refrigerating system compressor |
| US20050066673A1 (en) * | 2001-04-05 | 2005-03-31 | Bristol Compressors, Inc. | Pressure equalization system |
| EP1600630A2 (en) * | 2004-05-27 | 2005-11-30 | Leobersdorfer Maschinenfabrik AG | Multistage gas compressor and its control method |
| KR20060077218A (en) * | 2004-12-30 | 2006-07-05 | 엘지전자 주식회사 | Driving control method of the hot gas bypass valve of an airconditioner |
| JP2015074336A (en) * | 2013-10-09 | 2015-04-20 | 新庄自動車株式会社 | Vehicle control device |
| US20160265815A1 (en) * | 2013-12-12 | 2016-09-15 | Johnson Controls Technology Company | Steam turbine driven centrifugal heat pump |
| CN106403427A (en) * | 2016-08-31 | 2017-02-15 | 烟台欧森纳地源空调股份有限公司 | Control method for electronic expansion valve in starting stage of refrigeration system |
| CN110671833A (en) * | 2018-07-03 | 2020-01-10 | 广东美芝制冷设备有限公司 | Compressor and refrigerating system |
| CN208846785U (en) * | 2018-08-27 | 2019-05-10 | 上海兆雪冷冻设备有限公司 | A kind of multimachine list twin-stage is mixed to beat net for air-source heat pump units |
| CN111854119A (en) * | 2020-07-21 | 2020-10-30 | 珠海格力电器股份有限公司 | Stepless regulation control method for load output of water chilling unit and water chilling unit |
| CN214039021U (en) * | 2020-11-09 | 2021-08-24 | 珠海格力电器股份有限公司 | Refrigeration system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251682A (en) * | 2021-06-09 | 2021-08-13 | 依米康冷元节能科技（上海）有限公司 | Double-head compressor regulation and control method, device, equipment and storage medium |
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