CN115235150B - Automatic compressor control system who switches - Google Patents
Automatic compressor control system who switches Download PDFInfo
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- CN115235150B CN115235150B CN202210723736.6A CN202210723736A CN115235150B CN 115235150 B CN115235150 B CN 115235150B CN 202210723736 A CN202210723736 A CN 202210723736A CN 115235150 B CN115235150 B CN 115235150B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses an automatic switching compressor control system, relates to the technical field of refrigeration control, and solves the technical problem that reliable operation of refrigeration equipment can be ensured after a compressor fails; the system comprises: a plurality of refrigeration devices and an intelligent control center; the plurality of refrigeration equipment is provided with a plurality of electromagnetic valves, a plurality of one-way valves, a plurality of oil separators, a plurality of pressure sensors, a plurality of temperature sensors and a plurality of compressors for refrigeration; the pressure and temperature of the operation of the compressor are monitored through pressure sensors and/or temperature sensors arranged in front of and behind the compressor, whether the compressor works normally or not is judged through processing of pressure value information and/or temperature value information sent by the pressure sensors and/or the temperature sensors through an intelligent control center, the compressor and an electromagnetic valve are controlled to be automatically switched, and normal operation of refrigeration equipment is achieved.
Description
Technical Field
The invention belongs to the technical field of refrigeration control, and particularly relates to an automatic switching compressor control system.
Background
Some refrigeration equipment in special use occasions now require products to reliably work for a long time, for example, one continuous working time is 8760 hours, namely, one-year non-stop continuous working time; at present, the existing temperature regulation mode basically adopts the whole refrigeration equipment for backup, if 2 sets of refrigeration equipment are needed to meet the temperature regulation requirement, but adopts a mode of 3 sets of refrigeration equipment for meeting the requirement of continuous operation at one time, wherein 1 set of refrigeration equipment is backup, and the mode can meet the index requirement, but has higher cost and poorer economical efficiency. Under the background, the refrigeration equipment is analyzed, and the compressor of key devices of the refrigeration equipment is a weak link, so that the expected effect can be achieved as long as the reliable operation of the refrigeration equipment can be ensured after the fault of the compressor is solved.
Accordingly, the present invention is directed to an automatically switching compressor control system.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides an automatic switching compressor control system, which solves the problem that the reliable operation of refrigeration equipment can be ensured after the compressor fails.
To achieve the above object, an embodiment according to a first aspect of the present invention proposes an automatically switched compressor control system comprising: a plurality of refrigeration devices and an intelligent control center; the plurality of refrigeration equipment comprises first refrigeration equipment, second refrigeration equipment and nth refrigeration equipment, wherein n represents the number of the refrigeration equipment, and n is an integer greater than 1;
the plurality of refrigeration equipment is provided with a plurality of electromagnetic valves, a plurality of one-way valves, a plurality of oil separators, a plurality of pressure sensors, a plurality of temperature sensors and a plurality of compressors for refrigeration;
the electromagnetic valve is used for preventing liquid refrigerant from entering the compressor; the electromagnetic valve is in wireless connection with the intelligent control center;
the one-way valve is used for preventing the liquid refrigerant from flowing reversely;
the oil separator is used for separating lubricating oil in high-pressure steam discharged by the compressor;
the pressure sensor comprises a high pressure sensor and a low pressure sensor, and the high pressure sensor and the low pressure sensor are respectively arranged in an exhaust pipeline and an air return pipeline of the compressor; the pressure sensor is used for collecting the running pressure value of the compressor; the pressure sensor is in wireless connection with the intelligent control center, and the pressure sensor sends collected pressure value information to the intelligent control center;
the temperature sensor is used for collecting the running temperature value of the compressor; the temperature sensor is in wireless connection with the intelligent control center, and the temperature sensor sends acquired temperature value information to the intelligent control center;
the compressor is used for lifting the refrigerant from low pressure to high pressure so as to enable the refrigerant to continuously circulate in the pipeline; the compressor is in wireless connection with the intelligent control center;
the intelligent control center is used for receiving and processing the pressure value information sent by the pressure sensor, and is also used for receiving and processing the temperature value information sent by the temperature sensor, and the intelligent control center is also used for controlling the switching of the compressor; the intelligent control center is also used for controlling the switching of the electromagnetic valve; the intelligent control center comprises a processing unit, a first timing unit, a second timing unit, a third timing unit and a control unit.
Further, the system comprises a first refrigeration device, a second refrigeration device and an intelligent control center; the first refrigeration device and the second refrigeration device include: a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a first check valve, a second check valve, a third check valve, a fourth check valve, a fifth check valve, a sixth check valve, a first oil separator, a second oil separator, a third oil separator, a first high pressure sensor, a second high pressure sensor, a third high pressure sensor, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a sixth temperature sensor, a first compressor, a second compressor, a third compressor, a first low pressure sensor, a second low pressure sensor, a third low pressure sensor, a first refrigeration device, a second refrigeration device, and an intelligent control center;
before the initial refrigeration state, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are all powered off and are in a normally closed state.
Further, a first temperature sensor, a first high pressure sensor, a first oil separator and a first one-way valve are respectively arranged at the exhaust port end of the first compressor according to the flowing direction of the refrigerant; a second one-way valve, a second temperature sensor and a first low pressure sensor are respectively arranged at an air return port of the first compressor according to the flowing direction of the refrigerant;
and so on, the equipment types of the exhaust port and the return air port of the second compressor and the third compressor are the same as those of the first compressor.
Further, in the initial cooling operation state, the first compressor is used for the first cooling device, and the third compressor is used for the second cooling device; the first electromagnetic valve, the second electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally open state after being electrified, and the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are in a normally closed state after being powered off.
Further, the refrigeration equipment operation can be divided into the following situations and solutions for each of them:
case one: if the first compressor fails, automatically starting the second compressor for the first refrigeration system, and the third compressor is still used for the second refrigeration system; at the moment, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally open state after being electrified, and the fifth electromagnetic valve and the sixth electromagnetic valve are in a normally closed state after being powered off;
and a second case: if the third compressor fails, the second compressor is started for the second refrigeration system, and the first compressor is still used for the first refrigeration system; at the moment, the first electromagnetic valve, the second electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally open state after being electrified, and the third electromagnetic valve and the fourth electromagnetic valve are in a normally closed state after being powered off;
case three: if the first compressor and the second compressor are invalid at the same time, the first refrigerating system is preferentially ensured, and the third compressor is started for the first refrigerating system; at this time, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are in a normally open state after being electrified, and the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally closed state after being powered off;
case four: if the second compressor and the third compressor are simultaneously invalid and the second refrigerating system is preferentially ensured, the first compressor is started for the second refrigerating system; at this time, the third, fourth, fifth, sixth, seventh and eighth solenoid valves are in a normally open state after being energized, and the first and second solenoid valves are in a normally closed state.
Further, for the first case, the working principle of the intelligent control center for judging the failure of the first compressor is as follows:
s1: the first high-pressure sensor and the first low-pressure sensor collect the running pressure value of the first compressor and send the collected pressure value to the intelligent control center;
the first temperature sensor and the second temperature sensor collect the running temperature value of the first compressor and send the collected temperature value to the intelligent control center;
s2: after the processing unit receives the pressure value information, the processing unit marks the pressure value sent by the first high-pressure sensor as Pd, the processing unit marks the pressure value sent by the first low-pressure sensor as PH, the processing unit calculates Pd and PH, pa=Pd-PH, wherein Pa represents the difference value between the pressure value sent by the first high-pressure sensor and the pressure value sent by the first low-pressure sensor; the processing unit sets a difference threshold value of the pressure value sent by the first high pressure sensor and the pressure value sent by the first low pressure sensor as Pb;
after the processing unit receives the temperature value information, the processing unit marks the temperature value sent by the first temperature sensor as Td, the processing unit marks the temperature value sent by the second temperature sensor as TH, the processing unit calculates Td and TH, and Ta=Td-TH, wherein Ta represents the difference value between the temperature value sent by the first temperature sensor and the temperature value sent by the second temperature sensor; the processing unit sets a difference threshold value between the temperature value sent by the first temperature sensor and the temperature value sent by the second temperature sensor as Tb;
when Pa is less than or equal to Pb and/or Ta is less than or equal to Tb, the processing unit sends timing starting information to the first timing unit, and the first timing unit starts timing;
when Pa > Pb and/or Ta > Tb, the processing unit sends timing zero clearing information to the first timing unit, and the first timing unit carries out timing zero clearing;
s3: the processing unit marks the time counted by the first timing unit as Ha, and the processing unit sets the time threshold counted by the first timing unit as Hb;
when Pa is less than or equal to Pb and/or Ta is less than or equal to Tb, and ha=hb, the processing unit sends the information of the failure of the first compressor to the control unit;
the working principle of other cases is the same as that of the first case.
Further, for the first case, the working principle of the intelligent control center for controlling the automatic switching of the compressor is as follows:
s1: after receiving the information of failure of the first compressor sent by the processing unit, the control unit controls the first compressor to be powered off and closed, and sends the information that the compressor is powered off and closed to the processing unit;
s2: after the processing unit receives the information that the compressor is powered off and closed, the processing unit sends timing starting information to the second timing unit, and the second timing unit starts timing;
the processing unit marks the time counted by the second timing unit as Hc, and the processing unit sets the time threshold counted by the second timing unit as Hd;
when hc=hd, the processing unit sends information for controlling the electromagnetic valve to be closed and then opened to the control unit, and the control unit controls the third electromagnetic valve and the fourth electromagnetic valve to be electrified and opened according to the sequence that the electromagnetic valve is closed and then opened after receiving the information for controlling the electromagnetic valve to be closed and then opened sent by the processing unit;
s3: after the control unit controls the electromagnetic valve to switch, the control unit sends information that the electromagnetic valve is switched to the processing unit;
after receiving the information that the electromagnetic valve is switched, the processing unit sends timing starting information to the third timing unit, and the third timing unit starts timing;
the processing unit marks the time counted by the third time counting unit as He, and the processing unit sets the time threshold counted by the third time counting unit as Hf;
when he=hf, the processing unit sends information to the control unit to start the backup compressor, and the control unit controls the backup compressor to start, i.e., controls the second compressor to start.
Compared with the prior art, the invention has the beneficial effects that: the automatic switching compressor control system is mainly used in the application occasions requiring high-reliability refrigeration work, and the reliability of refrigeration tasks is effectively improved by identifying the faults of the compressors and completing switching to backup compressor work, so that the guarantee is provided for the task work of the refrigeration system; aiming at two sets of refrigerating systems, two compressors are combined in parallel, and the other compressor is redundant and backed up, and the working condition of the compressors is judged by collecting the running pressure difference value of the compressors and/or the running temperature difference value of the compressors through a pressure sensor and a temperature sensor; the intelligent control center controls the switching of the compressor and the opening and closing of the electromagnetic valve according to the logic principle described in the invention; the technical problem that reliable operation of the refrigeration equipment can be guaranteed after the compressor fails is solved.
Drawings
FIG. 1 is a schematic diagram of the present invention;
fig. 2 is a circuit schematic of an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, an automatically switched compressor control system includes: a plurality of refrigeration devices and an intelligent control center; the plurality of refrigeration equipment comprises first refrigeration equipment, second refrigeration equipment and nth refrigeration equipment, wherein n represents the number of the refrigeration equipment, and n is an integer greater than 1;
the plurality of refrigeration equipment is provided with a plurality of electromagnetic valves, a plurality of one-way valves, a plurality of oil separators, a plurality of pressure sensors, a plurality of temperature sensors and a plurality of compressors for refrigeration;
the electromagnetic valve is used for preventing liquid refrigerant from entering the compressor; the electromagnetic valve is in wireless connection with the intelligent control center;
the one-way valve is used for preventing the liquid refrigerant from flowing reversely;
the oil separator is used for separating lubricating oil in high-pressure steam discharged by the compressor;
the pressure sensor comprises a high pressure sensor and a low pressure sensor, and the high pressure sensor and the low pressure sensor are respectively arranged in an exhaust pipeline and an air return pipeline of the compressor; the pressure sensor is used for collecting the running pressure value of the compressor; the pressure sensor is in wireless connection with the intelligent control center, and the pressure sensor sends collected pressure value information to the intelligent control center;
the temperature sensor is used for collecting the running temperature value of the compressor; the temperature sensor is in wireless connection with the intelligent control center, and the temperature sensor sends acquired temperature value information to the intelligent control center;
the compressor is used for lifting the refrigerant from low pressure to high pressure so as to enable the refrigerant to continuously circulate in the pipeline; the compressor is in wireless connection with the intelligent control center;
the intelligent control center is used for receiving and processing the pressure value information sent by the pressure sensor, and is also used for receiving and processing the temperature value information sent by the temperature sensor, and the intelligent control center is also used for controlling the switching of the compressor; the intelligent control center is also used for controlling the switching of the electromagnetic valve; the intelligent control center comprises a processing unit, a first timing unit, a second timing unit, a third timing unit and a control unit;
in one embodiment of the present invention, an automatically switched compressor control system includes a first refrigeration device, a second refrigeration device, and an intelligent control center, wherein the first refrigeration device and the second refrigeration device include: a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a first check valve, a second check valve, a third check valve, a fourth check valve, a fifth check valve, a sixth check valve, a first oil separator, a second oil separator, a third oil separator, a first high pressure sensor, a second high pressure sensor, a third high pressure sensor, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a sixth temperature sensor, a first compressor, a second compressor, a third compressor, a first low pressure sensor, a second low pressure sensor, and a third low pressure sensor;
before the initial refrigeration state, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are all powered off and are in a normally closed state;
as shown in fig. 2, the exhaust port end of the first compressor is respectively provided with a first temperature sensor, a first high pressure sensor, a first oil separator and a first one-way valve according to the flowing direction of the refrigerant; a second one-way valve, a second temperature sensor and a first low pressure sensor are respectively arranged at an air return port of the first compressor according to the flowing direction of the refrigerant;
the exhaust port end of the second compressor is respectively provided with a third temperature sensor, a second high-pressure sensor, a second oil separator and a third one-way valve according to the flowing direction of the refrigerant; a fourth one-way valve, a fourth temperature sensor and a second low pressure sensor are respectively arranged at an air return port of the first compressor according to the flowing direction of the refrigerant;
a fifth temperature sensor, a third high-pressure sensor, a third oil separator and a fifth one-way valve are respectively arranged at the exhaust port end of the third compressor according to the flowing direction of the refrigerant; a sixth one-way valve, a sixth temperature sensor and a third low pressure sensor are respectively arranged at an air return port of the first compressor according to the flowing direction of the refrigerant;
the first check valve is connected with one end of the first electromagnetic valve, one end of the first check valve is also connected with one end of the third electromagnetic valve, the other end of the first check valve is connected with one end of the first oil separator, the other end of the first oil separator is connected with one end of the first high-pressure sensor, the other end of the first high-pressure sensor is connected with one end of the first temperature sensor, the other end of the first temperature sensor is connected with one end of the first compressor, the other end of the first compressor is connected with one end of the first low-pressure sensor, the other end of the first low-pressure sensor is connected with one end of the second temperature sensor, the other end of the second temperature sensor is connected with one end of the second check valve, the other end of the second check valve is connected with one end of the second electromagnetic valve, and the other end of the second check valve is also connected with one end of the fourth electromagnetic valve;
one end of the third one-way valve is connected with the other end of the third electromagnetic valve, one end of the third one-way valve is also connected with one end of the fifth electromagnetic valve, the other end of the third one-way valve is connected with one end of the second oil separator, the other end of the second oil separator is connected with one end of the second high-pressure sensor, the other end of the second high-pressure sensor is connected with one end of the third temperature sensor, the other end of the third temperature sensor is connected with one end of the second compressor, the other end of the second compressor is connected with one end of the second low-pressure sensor, the other end of the second low-pressure sensor is connected with one end of the fourth temperature sensor, the other end of the fourth temperature sensor is connected with one end of the fourth one-way valve, the other end of the fourth one-way valve is connected with the other end of the fourth electromagnetic valve, and the other end of the fourth one-way valve is also connected with one end of the sixth electromagnetic valve;
one end of the fifth one-way valve is connected with the other end of the fifth electromagnetic valve, one end of the fifth one-way valve is also connected with one end of the seventh electromagnetic valve, the other end of the fifth one-way valve is connected with one end of the third oil separator, the other end of the third oil separator is connected with one end of the third high-pressure sensor, the other end of the third high-pressure sensor is connected with one end of the fifth temperature sensor, the other end of the fifth temperature sensor is connected with one end of the third compressor, the other end of the third compressor is connected with one end of the third low-pressure sensor, the other end of the third low-pressure sensor is connected with one end of the sixth temperature sensor, the other end of the sixth temperature sensor is connected with one end of the sixth one-way valve, the other end of the sixth one-way valve is connected with the other end of the sixth electromagnetic valve, and the other end of the sixth one-way valve is also connected with one end of the eighth electromagnetic valve;
in one embodiment of the invention, in an initial refrigeration operating state, the first compressor is for a first refrigeration appliance and the third compressor is for a second refrigeration appliance; at this time, the first electromagnetic valve, the second electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally open state after being electrified, and the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are in a normally closed state after being powered off; the first compressor and the third compressor respectively provide power of refrigeration cycle for the first refrigeration equipment and the second refrigeration equipment, so that the refrigeration equipment can work normally;
in the normal working state of the refrigeration equipment, the intelligent control center can process the following situations:
case one: if the first compressor fails, automatically starting the second compressor for the first refrigeration system, and the third compressor is still used for the second refrigeration system; at the moment, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally open state after being electrified, and the fifth electromagnetic valve and the sixth electromagnetic valve are in a normally closed state after being powered off;
and a second case: if the third compressor fails, the second compressor is started for the second refrigeration system, and the first compressor is still used for the first refrigeration system; at the moment, the first electromagnetic valve, the second electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally open state after being electrified, and the third electromagnetic valve and the fourth electromagnetic valve are in a normally closed state after being powered off;
case three: if the first compressor and the second compressor are invalid at the same time, the first refrigerating system is preferentially ensured, and the third compressor is started for the first refrigerating system; at this time, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are in a normally open state after being electrified, and the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally closed state after being powered off;
case four: if the second compressor and the third compressor are simultaneously invalid and the second refrigerating system is preferentially ensured, the first compressor is started for the second refrigerating system; at this time, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally open state after being electrified, and the first electromagnetic valve and the second electromagnetic valve are in a normally closed state;
in this embodiment, the working principle of the intelligent control center for automatic switching of the compressor in the first situation is as follows:
the intelligent control center comprises a processing unit, a first timing unit, a second timing unit, a third timing unit and a control unit;
step one: the first high-pressure sensor and the first low-pressure sensor collect the running pressure value of the first compressor and send the collected pressure value to the intelligent control center;
the first temperature sensor and the second temperature sensor collect the running temperature value of the first compressor and send the collected temperature value to the intelligent control center;
step two: after the processing unit receives the pressure value information, the processing unit marks the pressure value sent by the first high-pressure sensor as Pd, the processing unit marks the pressure value sent by the first low-pressure sensor as PH, the processing unit calculates Pd and PH, pa=Pd-PH, wherein Pa represents the difference value between the pressure value sent by the first high-pressure sensor and the pressure value sent by the first low-pressure sensor; the processing unit sets a difference threshold value of the pressure value sent by the first high pressure sensor and the pressure value sent by the first low pressure sensor as Pb; in practice, pb may be equal to 5 in bar;
after the processing unit receives the temperature value information, the processing unit marks the temperature value sent by the first temperature sensor as Td, the processing unit marks the temperature value sent by the second temperature sensor as TH, the processing unit calculates Td and TH, and Ta=Td-TH, wherein Ta represents the difference value between the temperature value sent by the first temperature sensor and the temperature value sent by the second temperature sensor; the processing unit sets a difference threshold value between the temperature value sent by the first temperature sensor and the temperature value sent by the second temperature sensor as Tb; in practical cases, tb may be equal to 5 in degrees celsius;
when Pa is less than or equal to Pb and/or Ta is less than or equal to Tb, the processing unit sends timing starting information to the first timing unit, and the first timing unit starts timing;
when Pa > Pb and/or Ta > Tb, the processing unit sends timing zero clearing information to the first timing unit, and the first timing unit carries out timing zero clearing;
the processing unit marks the time counted by the first timing unit as Ha, and the processing unit sets the time threshold counted by the first timing unit as Hb; in practice, hb may be equal to 60 in H;
when Pa is less than or equal to Pb and/or Ta is less than or equal to Tb, and ha=hb, the processing unit sends the information of the failure of the first compressor to the control unit; the control unit controls the first compressor to be turned off in a power-off mode;
step three: when the control unit controls the first compressor to be powered off and closed, the control unit sends information that the compressor is powered off and closed to the processing unit, and after the processing unit receives the information that the compressor is powered off and closed, the processing unit sends timing starting information to the second timing unit, and the second timing unit starts timing;
the processing unit marks the time counted by the second timing unit as Hc, and the processing unit sets the time threshold counted by the second timing unit as Hd; in practical cases, hd may be equal to 10 in min;
step four: the control unit detects that the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are in a power-off and closed state at the moment, and the first electromagnetic valve, the second electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a power-on and open state;
when hc=hd, the processing unit sends information for controlling the electromagnetic valve to be closed and then opened to the control unit, and the control unit controls the third electromagnetic valve and the fourth electromagnetic valve to be electrified and opened according to the sequence that the electromagnetic valve is closed and then opened after receiving the information for controlling the electromagnetic valve to be closed and then opened sent by the processing unit;
step five: after the control unit controls the electromagnetic valve to switch, the control unit sends information that the electromagnetic valve is switched to the processing unit;
after receiving the information that the electromagnetic valve is switched, the processing unit sends timing starting information to the third timing unit, and the third timing unit starts timing;
the processing unit marks the time counted by the third time counting unit as He, and the processing unit sets the time threshold counted by the third time counting unit as Hf; in practice, hf may be equal to 2 in H;
when he=hf, the processing unit sends information for starting the backup compressor to the control unit, and the control unit controls the backup compressor to start, i.e. controls the second compressor to start;
finally, the second compressor is used for the first refrigeration equipment after replacing the first compressor, and the third compressor is still used for the second refrigeration equipment; at the moment, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in an electrified normally-open state, and the fifth electromagnetic valve and the sixth electromagnetic valve are in an outage normally-closed state;
similarly, the intelligent control center controls the compressor to automatically switch under other conditions according to the same working principle;
it should be noted that the electromagnetic valve may be a ball valve or a stop valve;
it should be noted that the backup compressor is not limited to the redundant backup of one compressor described in the above embodiments, and may be two or more compressors;
it should be noted that the number of the refrigeration apparatuses is not limited to the two refrigeration systems described in the above embodiments, and may be one refrigeration system or more refrigeration systems;
the pressure sensor and the temperature sensor for determining the failure of the compressor in the refrigeration equipment may be only one sensor or may be both sensors.
The above formulas are all formulas with dimensions removed and numerical values calculated, the formulas are formulas which are obtained by acquiring a large amount of data and performing software simulation to obtain the closest actual situation, and preset parameters and preset thresholds in the formulas are set by a person skilled in the art according to the actual situation or are obtained by simulating a large amount of data.
The working principle of the invention is as follows: the compressors in the two sets of conventional refrigeration equipment are uniformly distributed and combined in parallel, and one compressor is redundant and backed up between the compressors of the two sets of refrigeration equipment;
each compressor is provided with related accessories, namely a one-way valve, an oil separator, a high-pressure sensor, a low-pressure sensor, a temperature sensor and an electromagnetic valve, and switching of refrigeration equipment is realized through the opening and closing actions of the electromagnetic valve;
monitoring the running pressure and temperature of the compressor through pressure sensors and/or temperature sensors arranged in front of and behind the compressor, and judging whether the compressor works normally or not through processing pressure value information and/or temperature value information sent by the pressure sensors and/or the temperature sensors through an intelligent control center; when judging that the compressor fails, the intelligent control center controls the compressor to be powered off and turned off, after waiting for the Hd time, the electromagnetic valves are switched according to the sequence that the electromagnetic valves are turned off and then turned on, and after delaying the Hf time, the standby compressor is started, so that the automatic switching work of the compressor is completed.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus, device and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be other manners of division when actually implemented; the modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the method of this embodiment.
It will also be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims shall not be construed as limiting the claim concerned.
Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. A plurality of units or means recited in the system claims can also be implemented by means of software or hardware by means of one unit or means. The terms second, etc. are used to denote a name, but not any particular order.
Finally, it should be noted that the above embodiments are only for illustrating the technical method of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical method of the present invention may be modified or substituted without departing from the spirit and scope of the technical method of the present invention.
Claims (3)
1. A control method of an automatically switched compressor control system, characterized in that the control system comprises: a plurality of refrigeration devices and an intelligent control center; the plurality of refrigeration equipment comprises first refrigeration equipment, second refrigeration equipment and nth refrigeration equipment, wherein n represents the number of the refrigeration equipment, and n is an integer greater than 1;
the plurality of refrigeration equipment is provided with a plurality of electromagnetic valves, a plurality of one-way valves, a plurality of oil separators, a plurality of pressure sensors, a plurality of temperature sensors and a plurality of compressors for refrigeration;
the electromagnetic valve is used for preventing liquid refrigerant from entering the compressor; the electromagnetic valve is in wireless connection with the intelligent control center;
the one-way valve is used for preventing the liquid refrigerant from flowing reversely;
the oil separator is used for separating lubricating oil in high-pressure steam discharged by the compressor;
the pressure sensor comprises a high pressure sensor and a low pressure sensor, and the high pressure sensor and the low pressure sensor are respectively arranged in an exhaust pipeline and an air return pipeline of the compressor; the pressure sensor is used for collecting the running pressure value of the compressor; the pressure sensor is in wireless connection with the intelligent control center, and the pressure sensor sends collected pressure value information to the intelligent control center;
the temperature sensor is used for collecting the running temperature value of the compressor; the temperature sensor is in wireless connection with the intelligent control center, and the temperature sensor sends acquired temperature value information to the intelligent control center;
the compressor is used for lifting the refrigerant from low pressure to high pressure so as to enable the refrigerant to continuously circulate in the pipeline; the compressor is in wireless connection with the intelligent control center;
the intelligent control center is used for receiving and processing the pressure value information sent by the pressure sensor, and is also used for receiving and processing the temperature value information sent by the temperature sensor, and the intelligent control center is also used for controlling the switching of the compressor; the intelligent control center is also used for controlling the switching of the electromagnetic valve; the intelligent control center comprises a processing unit, a first timing unit, a second timing unit, a third timing unit and a control unit;
the first refrigeration equipment, the second refrigeration equipment and the intelligent control center; the first refrigeration device and the second refrigeration device include: a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a first check valve, a second check valve, a third check valve, a fourth check valve, a fifth check valve, a sixth check valve, a first oil separator, a second oil separator, a third oil separator, a first high pressure sensor, a second high pressure sensor, a third high pressure sensor, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a sixth temperature sensor, a first compressor, a second compressor, a third compressor, a first low pressure sensor, a second low pressure sensor, a third low pressure sensor;
before the initial refrigeration state, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are all powered off and are in a normally closed state;
the exhaust port of the first compressor is respectively provided with a first temperature sensor, a first high-pressure sensor, a first oil separator and a first one-way valve according to the flowing direction of the refrigerant; a second one-way valve, a second temperature sensor and a first low pressure sensor are respectively arranged at an air return port of the first compressor according to the flowing direction of the refrigerant;
and so on, the equipment types of the exhaust port and the return air port of the second compressor and the third compressor are the same as those of the first compressor;
in an initial refrigeration running state, the first compressor is used for the first refrigeration equipment, and the third compressor is used for the second refrigeration equipment; the first electromagnetic valve, the second electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally open state after being electrified, and the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are in a normally closed state after being powered off;
the control method includes solutions for the operation of the refrigeration equipment, which can be divided into the following situations and various situations:
case one: if the first compressor fails, automatically starting the second compressor for the first refrigeration system, and the third compressor is still used for the second refrigeration system; at the moment, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally open state after being electrified, and the fifth electromagnetic valve and the sixth electromagnetic valve are in a normally closed state after being powered off;
and a second case: if the third compressor fails, the second compressor is started for the second refrigeration system, and the first compressor is still used for the first refrigeration system; at the moment, the first electromagnetic valve, the second electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally open state after being electrified, and the third electromagnetic valve and the fourth electromagnetic valve are in a normally closed state after being powered off;
case three: if the first compressor and the second compressor are invalid at the same time, the first refrigerating system is preferentially ensured, and the third compressor is started for the first refrigerating system; at this time, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are in a normally open state after being electrified, and the seventh electromagnetic valve and the eighth electromagnetic valve are in a normally closed state after being powered off;
case four: if the second compressor and the third compressor are simultaneously invalid and the second refrigerating system is preferentially ensured, the first compressor is started for the second refrigerating system; at this time, the third, fourth, fifth, sixth, seventh and eighth solenoid valves are in a normally open state after being energized, and the first and second solenoid valves are in a normally closed state.
2. The method for controlling an automatically switched compressor control system according to claim 1, wherein, for the first situation, the intelligent control center determines that the first compressor fails according to the following working principle:
s1: the first high-pressure sensor and the first low-pressure sensor collect the running pressure value of the first compressor and send the collected pressure value to the intelligent control center;
the first temperature sensor and the second temperature sensor collect the running temperature value of the first compressor and send the collected temperature value to the intelligent control center;
s2: after the processing unit receives the pressure value information, the processing unit marks the pressure value sent by the first high-pressure sensor as Pd, the processing unit marks the pressure value sent by the first low-pressure sensor as PH, the processing unit calculates Pd and PH, pa=Pd-PH, wherein Pa represents the difference value between the pressure value sent by the first high-pressure sensor and the pressure value sent by the first low-pressure sensor; the processing unit sets a difference threshold value of the pressure value sent by the first high pressure sensor and the pressure value sent by the first low pressure sensor as Pb;
after the processing unit receives the temperature value information, the processing unit marks the temperature value sent by the first temperature sensor as Td, the processing unit marks the temperature value sent by the second temperature sensor as TH, the processing unit calculates Td and TH, and Ta=Td-TH, wherein Ta represents the difference value between the temperature value sent by the first temperature sensor and the temperature value sent by the second temperature sensor; the processing unit sets a difference threshold value between the temperature value sent by the first temperature sensor and the temperature value sent by the second temperature sensor as Tb;
when Pa is less than or equal to Pb and Ta is less than or equal to Tb, the processing unit sends timing starting information to the first timing unit, and the first timing unit starts timing;
when Pa > Pb and Ta > Tb, the processing unit sends timing clear information to the first timing unit, and the first timing unit carries out timing clear;
s3: the processing unit marks the time counted by the first timing unit as Ha, and the processing unit sets the time threshold counted by the first timing unit as Hb;
when Pa is less than or equal to Pb and/or Ta is less than or equal to Tb, and ha=hb, the processing unit sends the information of the failure of the first compressor to the control unit;
the working principle of other cases is the same as that of the first case.
3. The method for controlling an automatically switched compressor control system according to claim 1, wherein, for the first situation, the working principle of the intelligent control center for controlling the automatic switching of the compressor is as follows:
s1: after receiving the information of failure of the first compressor sent by the processing unit, the control unit controls the first compressor to be powered off and closed, and sends the information that the compressor is powered off and closed to the processing unit;
s2: after the processing unit receives the information that the compressor is powered off and closed, the processing unit sends timing starting information to the second timing unit, and the second timing unit starts timing;
the processing unit marks the time counted by the second timing unit as Hc, and the processing unit sets the time threshold counted by the second timing unit as Hd;
when hc=hd, the processing unit sends information for controlling the electromagnetic valve to close first and then open to the control unit, and after receiving the information for controlling the electromagnetic valve to close first and then open sent by the processing unit, the control unit controls the third electromagnetic valve and the fourth electromagnetic valve to be electrified and opened according to the sequence that the electromagnetic valve is closed first and then open;
s3: after the control unit controls the electromagnetic valve to switch, the control unit sends information that the electromagnetic valve is switched to the processing unit;
after receiving the information that the electromagnetic valve is switched, the processing unit sends timing starting information to the third timing unit, and the third timing unit starts timing;
the processing unit marks the time counted by the third time counting unit as He, and the processing unit sets the time threshold counted by the third time counting unit as Hf;
when he=hf, the processing unit sends information to the control unit to start the backup compressor, and the control unit controls the backup compressor to start, i.e., controls the second compressor to start.
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