CN112361633B - Refrigerating system and control method thereof - Google Patents
Refrigerating system and control method thereof Download PDFInfo
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- CN112361633B CN112361633B CN202011241640.3A CN202011241640A CN112361633B CN 112361633 B CN112361633 B CN 112361633B CN 202011241640 A CN202011241640 A CN 202011241640A CN 112361633 B CN112361633 B CN 112361633B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001105 regulatory effect Effects 0.000 claims abstract description 75
- 230000001276 controlling effect Effects 0.000 claims description 34
- 238000005057 refrigeration Methods 0.000 claims description 16
- 239000003507 refrigerant Substances 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method 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
- 230000003068 static effect Effects 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
- 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 refrigerating system and a control method thereof, wherein the system comprises: the first compressor and the second compressor are arranged in parallel; one end of the first load regulating valve is connected with the exhaust port of the first compressor, and the other end of the first load regulating valve is connected with the 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 discharge 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; 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 a 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, so that the rotor of the second compressor is pushed to rotate. The invention solves the problems of large starting current and easy current impact damage of the compressor in the prior art, and prolongs the working 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
In the current start-stop control of a compressor of refrigeration equipment, the compressor performs start-stop control according to the setting and detection of target parameters.
When the motor rotor is started and electrified, the motor rotor is adjusted to a motion state from a static state in a short time, and at the moment, the starting current is large, so that the motor can cause instantaneous large current impact. Besides the current impact of the motor of the compressor caused in the starting process, the small load operation requirement or the large load requirement fluctuation often occurs due to the cold load requirement of a user, so that the compressor needs to be started and stopped frequently, and the problems of oil shortage and the like in the operation of the compressor are also caused due to the excessive start and stop times.
Aiming at the problems of high starting current and easy current impact damage of the compressor in the related technology, no effective solution is proposed at present.
Disclosure of Invention
The invention provides a refrigerating system and a control method thereof, which at least solve the problems of high starting current of a compressor and easy current impact damage 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 the exhaust port of the first compressor, and the other end of the first load regulating valve is connected with the 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 discharge 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; 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 a 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, so that the rotor of the second compressor is pushed to rotate.
Further, the method further comprises the following steps: 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 after the first and second load adjusting valves are opened, the first and second exhaust valves are opened.
Further, the second compressor further includes: and the unloading electromagnetic valve is used for opening before the first load regulating valve and the second load regulating valve are opened, and unloading 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: the first electronic expansion valve and the 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.
Further, when the pressure of the first compressor is unloaded to a minimum value and the second compressor is stopped, the first load regulating valve and the second load regulating valve are opened, the second exhaust valve is opened and closed, and the second electronic expansion valve is opened, so that the refrigerant discharged from the exhaust port of the first compressor passes through the second electronic expansion valve and the evaporator to release heat, enters the second condenser to reach the exhaust port of the second compressor, and then enters the air suction port of the first compressor.
According to another aspect of an embodiment 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 requirement cannot be met, the first load regulating valve and the second load regulating valve are controlled to be opened; after the first and second load adjusting valves are opened, the second compressor is controlled to be opened.
Further, before controlling the first load adjusting valve and the second load adjusting valve to open, the method further includes: determining unloading time of an unloading solenoid valve according to the operation 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 adjusting valve and the second load adjusting 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, further comprising: and controlling the first exhaust valve and the second exhaust valve to be opened.
Further, the method further comprises the following steps: when the pressure of the first compressor is unloaded to the minimum value and the second compressor is stopped, the first load regulating valve and the second load regulating 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 adjusting valve and the second load adjusting valve to open includes: determining opening values of a first load regulating valve and a 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 opening values.
According to yet another aspect of embodiments 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.
According to the invention, by adopting a load allocation control scheme of two compressors, 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 rotor of the compressor 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 a compressor motor is reduced, and the working life of the compressor is prolonged.
Drawings
FIG. 1 is a schematic diagram of an alternative construction of a refrigeration system according to an embodiment of the present invention;
Fig. 2 is an alternative flow chart of a method of controlling a refrigeration system according to an embodiment of the present invention.
Reference numerals illustrate:
1. A first compressor; 2. a second compressor; 3. an evaporator; 4. a first load control valve; 5. a second load control 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 exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying 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 structural schematic diagram of the system, as shown in fig. 1, the system includes:
The compressor, the condenser, the electronic expansion valve and the evaporator 3 are connected in sequence;
wherein the compressor comprises a first compressor 1 and a second compressor 2 which are arranged in parallel;
a first load control valve 4 having one end connected to the exhaust port of the first compressor 1 and the other end connected to the intake port of the second compressor 2;
a second load control valve 5, one end of which is connected to the intake port of the first compressor 1 and the other end of which is connected to the exhaust port of the second compressor 2;
The first load control valve 4 and the second load control valve 5 are used for adjusting the suction and discharge pressures of the first compressor 1 and the second compressor 2; before the first compressor 1 is in an operation state and the second compressor 2 is turned on, the first load adjusting valve 4 and the second load adjusting valve 5 are turned on, and a pressure difference is established between the air suction port and the air discharge port of the second compressor 2 by the pressure of the air discharge port and the air suction port of the first compressor 1, so as to push the rotor of the second compressor 2 to rotate.
In the embodiment, the load allocation control scheme of the two compressors is 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 rotor of the compressor 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 working 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; also included at the first compressor 1 and the second compressor 2 are: a first exhaust valve 6, located at the exhaust port of the first compressor 1, for controlling the first compressor 1 to exhaust; a second exhaust valve 7, located at the exhaust port of the second compressor 2, 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 adjusting valve 4 and the second load adjusting valve 5 are opened.
Wherein the second compressor 2 further comprises: an unloading solenoid valve for opening before the first load adjusting valve 4 and the second load adjusting valve 5 are opened, and unloading 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 the air suction and exhaust of the two compressors are correspondingly exhausted, and the air exhaust is correspondingly connected. When one of the compressors (corresponding to the first compressor 1) is already loaded to the highest capacity according to the load requirement and the second compressor (corresponding to the second compressor 2) needs to be started, firstly, an unloading electromagnetic valve of the stopped second compressor is started, and the compressor is kept at the lowest load at the moment. And unloading the energizing time of the electromagnetic valve, and setting according to parameters of different compressors. After the unloading solenoid valve is electrified, the suction and exhaust load regulating valve is opened to the maximum, the first exhaust valve 6 and the second exhaust valve 7 are opened, the exhaust gas of the first running compressor is conducted to the suction pipe of the second running compressor, and the suction gas of the first running compressor is conducted to the exhaust pipe of the second running compressor. At this time, the suction gas of the compressor forms high pressure, the exhaust gas forms low pressure, and the refrigerant gas flow enters the suction gas of the compressor II from the exhaust gas of the compressor I, then enters 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 second motor of the next compressor after the second 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 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 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 that the compressor is frequently started and stopped due to the fact that the small load operation requirement or the large load requirement fluctuation occurs due to the fact that the user uses the cold load requirement in the operation process of the compressor, and the problems that the compressor is in operation and oil shortage and the like are caused due to the fact that the compressor is required to be started and stopped frequently are solved.
To solve the above problem, when the pressure of the first compressor 1 is unloaded to a minimum value and the second compressor 2 is stopped, the first load control valve 4 and the second load control valve 5 are opened, the second discharge valve 7 is opened and closed, and the second electronic expansion valve 11 is opened, so that the refrigerant discharged from the discharge port of the first compressor 1 releases heat through the second electronic expansion valve 11 and the evaporator 3, and then enters the second condenser 9 to reach the discharge port of the second compressor 2, and then enters the suction port of the first compressor 1.
Specifically, when one of the compressors is unloaded to the minimum capacity according to the load demand and cannot be adjusted, the other compressor is stopped. Opening the air suction and exhaust load regulating valve, opening and controlling to be closed or opened, closing the exhaust valve of the second compressor, opening the electronic expansion valve of the second compressor, and conducting the exhaust gas of the first running compressor to the air suction pipe of the second compressor, and conducting the air suction of the first running compressor to the air discharge pipe of the second running compressor. At this time, the suction of the compressor forms high pressure, the discharge of the compressor forms low pressure, but the two discharge valves of the compressor are already closed, and the two electronic expansion valves of the compressor are opened. The refrigerant air flow is discharged from the first compressor through the second electronic expansion valve evaporator 3 of the compressor, and then is changed into liquid, and enters the condenser of the second compressor to reach the discharge air under the action of pressure difference, and then enters the suction air of the first compressor.
In this process, the normal discharge of the first compressor is divided into a part, and the refrigerating capacity is reduced. Meanwhile, part of the separated exhaust gas enters the evaporator 3 to discharge heat to consume part of the refrigerating capacity, so that the purpose of reducing the refrigerating capacity without closing the compressor is achieved, and the compressor is prevented from being started and stopped frequently.
The invention connects the exhaust pipeline and the air suction pipeline of a running compressor with the air suction pipeline and the air discharge pipeline of a stopping compressor, so that the load of the running compressor can be further reduced, or the rotor of the compressor is pushed to rotate in advance in a pneumatic mode before the stopping compressor is started, thereby avoiding frequent starting and stopping of the compressor and reducing the starting current of the compressor.
Example 2
In a preferred embodiment 2 of the present invention, a control method of a refrigeration system is provided, which is applied to the refrigeration system in the above-described embodiment 1. Specifically, fig. 2 shows an alternative flow chart of the method, as shown in fig. 2, comprising 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 requirement cannot be met, the first load regulating valve and the second load regulating valve are controlled to be opened;
S206: after the first and second load adjusting valves are opened, the second compressor is controlled to be opened.
In the embodiment, the load allocation control scheme of the two compressors is 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 rotor of the compressor 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 working life of the compressor is prolonged.
Before controlling the first load adjusting valve and the second load adjusting valve to open, the method further comprises: determining unloading time of an unloading solenoid valve according to the operation 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 cannot meet the load demand, controlling the first load regulating valve and the second load regulating valve to open comprises: 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, further comprising: and controlling the first exhaust valve and the second exhaust valve to be opened.
The scheme is used for controlling the compressor to be stopped before being started, and the rotor of the compressor is pushed to rotate in advance in a pneumatic mode, so that the starting current of the compressor is reduced. In addition, the invention also comprises: when the pressure of the first compressor is unloaded to the minimum value and the second compressor is stopped, the first load regulating valve and the second load regulating 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 air suction pipeline of one running compressor are communicated with the air suction and exhaust pipeline of the shutdown compressor, so that the load of the running compressor can be further reduced, and the frequent start and stop of the compressor are avoided.
Preferably, controlling the first load adjusting valve and the second load adjusting valve to be opened includes: determining opening values of a first load regulating valve and a 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 opening values.
In summary, the invention aims at the double-compressor refrigerating system, and the load allocation of the two compressors is carried out according to the actual temperature and pressure parameters during the starting and running period, and the control scheme solves the problems of large starting current of the compressors and frequent starting of the compressors, so that the long-time running of the compressors is kept, and the working 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 a preferred embodiment 3 of the present invention a storage medium containing computer-executable instructions that when executed by a computer processor are for performing the refrigeration system control method as described above.
In the embodiment, the load allocation control scheme of the two compressors is 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 rotor of the compressor 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 working life of the compressor is prolonged.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected 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:
the compressor, the condenser, the electronic expansion valve and the evaporator (3) are connected in sequence;
wherein the compressor comprises a first compressor (1) and a second compressor (2) which are arranged in parallel;
A first load control valve (4) having one end connected to the exhaust port of the first compressor (1) and the other end connected to the intake port of the second compressor (2);
a second load control valve (5) having one end connected to the intake port of the first compressor (1) and the other end connected to the exhaust port of the second compressor (2);
The first load regulating valve (4) and the second load regulating valve (5) are used for regulating the suction and exhaust pressure of the first compressor (1) and the second compressor (2); before the first compressor (1) is in a running state and the second compressor (2) is started, the first load regulating valve (4) and the second load regulating valve (5) are started, and a pressure difference is established between the air suction port and the air discharge port of the second compressor (2) through the pressure of the air discharge port and the air suction port of the first compressor (1), so that the rotor of the second compressor (2) is pushed to rotate.
2. The system of claim 1, further comprising:
A first exhaust valve (6) located at the exhaust port of the first compressor (1) and used for controlling the first compressor (1) to exhaust;
A second exhaust valve (7) located at the exhaust port of the second compressor (2) and used for controlling the second compressor (2) to exhaust;
wherein after the first load control valve (4) and the second load control valve (5) are opened, the first exhaust valve (6) and the second exhaust valve (7) are opened.
3. The system according to claim 1, wherein the second compressor (2) further comprises: an unloading solenoid valve for opening before the first load adjusting valve (4) and the second load adjusting valve (5) are opened, and unloading the pressure of the second compressor (2).
4. The system of claim 2, wherein the system further comprises a controller configured to control the controller,
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 adjusting valve (4) and the second load adjusting valve (5) are opened, the second discharge valve (7) is opened and closed, and the second electronic expansion valve (11) is opened, so that the refrigerant discharged from the discharge port of the first compressor (1) passes through the second electronic expansion valve (11) and the evaporator (3) to release heat, and then enters the second condenser (9) to reach the discharge port of the second compressor (2), and then enters the suction port of the first compressor (1).
6. A method of controlling a refrigeration system, 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 requirement cannot be met, the first load regulating valve and the second load regulating valve are controlled to be opened;
After the first load regulating valve and the second load regulating valve are opened, controlling a second compressor to be opened;
Wherein the first compressor and the second compressor are arranged in parallel;
One end of the first load regulating valve is connected with the exhaust port of the first compressor, and the other end of the first load regulating valve is connected with the 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 discharge port of the second compressor;
The first load regulating valve and the second load regulating valve are used for regulating the suction and discharge pressures of the first compressor and the second compressor; before the first compressor is in a running 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, so that the rotor of the second compressor is pushed to rotate.
7. The method of claim 6, further comprising, prior to controlling the first and second load regulating valves to open:
determining unloading time of an unloading electromagnetic valve according to the operation parameters of the second compressor;
And controlling the unloading solenoid valve to open the unloading time, and unloading the pressure of the second compressor to the minimum value.
8. The method of claim 6, wherein the step of providing the first layer comprises,
The controlling 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 the maximum value;
After the first load adjusting valve and the second load adjusting valve are opened, further comprising:
and controlling the first exhaust valve and the second exhaust valve to be opened.
9. The method as recited in claim 6, further comprising:
And when the pressure of the first compressor is unloaded to the minimum value and the second compressor is stopped, controlling the first load regulating valve and the second load regulating valve to be opened, simultaneously controlling the second exhaust valve to be opened and closed, and opening the second electronic expansion valve.
10. The method of claim 9, wherein said controlling the opening of the first and second load regulating valves comprises:
determining opening values of the first load regulating valve and the second load regulating valve according to a difference value between the current load of the system and the load demand;
And controlling the first load regulating valve and the second load regulating valve to the opening value.
11. A storage medium containing computer executable instructions which, when executed by a computer processor, are for performing the refrigeration system control method of any of claims 6 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011241640.3A CN112361633B (en) | 2020-11-09 | 2020-11-09 | Refrigerating system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011241640.3A CN112361633B (en) | 2020-11-09 | 2020-11-09 | Refrigerating system and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112361633A CN112361633A (en) | 2021-02-12 |
| CN112361633B true CN112361633B (en) | 2024-07-16 |
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Family Applications (1)
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| AT413870B (en) * | 2004-05-27 | 2006-06-15 | Leobersdorfer Maschf | MULTI-STAGE PISTON COMPRESSOR FOR THE COMPACTION OF GAS AND METHOD FOR COMPENSATION CONTROL |
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