CN113375356A - Control method of multi-split refrigerating and freezing unit and multi-split refrigerating and freezing unit - Google Patents
Control method of multi-split refrigerating and freezing unit and multi-split refrigerating and freezing unit Download PDFInfo
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- CN113375356A CN113375356A CN202110592703.8A CN202110592703A CN113375356A CN 113375356 A CN113375356 A CN 113375356A CN 202110592703 A CN202110592703 A CN 202110592703A CN 113375356 A CN113375356 A CN 113375356A
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- 238000007710 freezing Methods 0.000 title claims abstract description 69
- 230000008014 freezing Effects 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000005057 refrigeration Methods 0.000 claims abstract description 76
- 230000003434 inspiratory effect Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 38
- 239000007788 liquid Substances 0.000 description 35
- 230000001276 controlling effect Effects 0.000 description 16
- 239000003921 oil Substances 0.000 description 9
- 238000010257 thawing Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
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- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a control method of a multi-split refrigerating and freezing unit and the multi-split refrigerating and freezing unit using the control method. The control method comprises the following steps: acquiring the starting number of the indoor units of the multi-split refrigerating and freezing unit; and controlling the compressor to enter an anti-misoperation stop mode or a normal stop mode based on the starting number of the indoor unit. The method can effectively avoid the condition of the error stop of the compressor when the refrigeration requirement of the indoor unit is not met by controlling the compressor to enter the error stop prevention mode or the normal stop mode through the startup numerical control based on the indoor unit.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a control method of a multi-split refrigerating and freezing unit and the multi-split refrigerating and freezing unit.
Background
In the modern industrial and agricultural production process, the refrigerating and freezing unit can provide effective temperature control, so that the production efficiency and the product quality are continuously improved, and therefore, the refrigerating and freezing unit is widely applied to the fields of food processing, mechanical manufacturing, medicine production, grain storage and the like. Refrigeration and freezing units, including but not limited to water-cooled units and air-cooled units, may be used to cool refrigerators directly with a refrigerant (also referred to as "refrigerant") to provide suitable refrigeration and/or freezing temperatures. Some refrigeration and freezing units employ a vapor compression refrigeration cycle, such as using a screw compressor or scroll compressor. The refrigeration and freezing unit further includes at least a condenser, an evaporator, and an expansion device. The refrigerating-freezing unit can be divided into two parts, an outdoor unit (which is usually placed in an outdoor environment) and an indoor unit (which is usually placed in an indoor environment to be temperature-regulated, for example a cold storage) which are interconnected with each other. The compressor and the condenser are disposed in the outdoor unit, and the evaporator and the expansion device are disposed in the indoor unit. In the refrigeration cycle, the compressor sucks a low-temperature and low-pressure gaseous refrigerant through the suction port and compresses the refrigerant into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant is discharged from a discharge port of the compressor and flows into the condenser along a pipe. In the condenser, a high-temperature and high-pressure gaseous refrigerant is condensed into a medium-temperature and high-pressure liquid refrigerant by means of an air cooling or water cooling method. The medium-temperature high-pressure liquid refrigerant flows from the condenser to the expansion device along the pipeline, and is throttled in the expansion device into low-temperature low-pressure liquid refrigerant. Then, the low-temperature low-pressure liquid refrigerant flows along the pipeline to the evaporator. In the evaporator, the liquid refrigerant is evaporated into a low-temperature and low-pressure gaseous refrigerant by absorbing heat of the indoor air, and the indoor air is cooled to a predetermined target refrigerating temperature or a target freezing temperature. The low-temperature and low-pressure gaseous refrigerant is then sucked and compressed again by the compressor, thereby starting a new refrigeration cycle.
A multi-split refrigeration and freezing unit typically has N (N is an integer greater than 1) indoor units. When the refrigerating and freezing unit is used, a user can randomly start one, two, three or N indoor units according to actual requirements. And each indoor unit adjusts the indoor temperature according to the target temperature set by the user, when the indoor temperature reaches the set target temperature, the fan of the corresponding indoor unit is stopped, and the corresponding indoor electromagnetic valve is disconnected. When the indoor unit is successively stopped, the suction pressure of the compressor gradually decreases due to a reduction in the load in the refrigeration system. In practice, there are the following cases: the indoor temperature that an indoor set corresponds has not reached the target temperature of settlement yet, and if two, three or many indoor sets shut down simultaneously this moment, the suction pressure of compressor can descend rapidly, when suction pressure drops to settlement shut down pressure, the compressor can the mistake shut down, and can not satisfy the refrigeration demand of the indoor set that is still moving.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the technical problem of the conventional multi-split refrigeration and freezing unit that the compressor is stopped by mistake, the present invention provides a control method for a multi-split refrigeration and freezing unit, wherein the control method comprises:
acquiring the starting number of the indoor units of the multi-split refrigerating and freezing unit;
and controlling the compressor to enter an anti-misoperation stop mode or a normal stop mode based on the starting number of the indoor unit.
As can be understood by those skilled in the art, in the control method of the multi-split refrigeration and freezing unit, whether the total refrigeration requirement of the multi-split refrigeration and freezing unit is met can be accurately judged by acquiring the starting number of the indoor units of the multi-split refrigeration and freezing unit. Based on the starting number of the indoor units, the compressor is controlled to enter an anti-misoperation stop mode or a normal stop mode, so that the compressor can stop after the refrigeration requirements of all the indoor units are met. Therefore, the control method can effectively avoid the condition that the compressor is stopped by mistake when the refrigerating requirement of the indoor unit is not met.
In a preferred technical solution of the control method for a multi-split refrigeration and freezing unit, the method for obtaining the number of started indoor units includes:
acquiring a disconnection signal of an indoor electromagnetic valve of each indoor unit; or acquiring a current signal or a power signal of a fan of each indoor unit;
and determining the starting number of the indoor unit based on the turn-off signal of the indoor electromagnetic valve or the current signal or the power signal of the fan. When the opening and closing of the indoor electromagnetic valve can trigger signals and are captured by a detection system of the multi-split refrigerating and freezing unit, the starting number of the indoor units can be determined by acquiring the turn-off signals of the indoor electromagnetic valves of each indoor unit. That is, the number of the indoor units is equal to the total number of the indoor units minus the number of the indoor solenoid valves that are turned off. When the opening and closing of the indoor electromagnetic valve can not trigger signals, the starting number of the indoor units can be determined by acquiring current signals or power signals of the fans of each indoor unit. It can be understood that when the current signal or the power signal of the fan of the indoor unit is 0, the indoor unit is said to be stopped. Therefore, the number of the indoor units is equal to the total number of the indoor units minus the number of the indoor units with the current signal or the power signal of the fan of the indoor unit being 0.
In the above preferred technical solution of the control method for a multi-split refrigeration and freezing unit, when the number of the indoor units started is equal to 1, the compressor enters the anti-misoperation mode. When the starting number of the indoor units is equal to 1, the refrigeration requirement of the currently running indoor units is not met, and the compressor cannot be stopped at the moment, so that the compressor is controlled to enter the anti-misoperation stop mode.
In a preferred embodiment of the above method for controlling a multi-split refrigeration and freezing unit, the anti-misstop mode includes:
detecting a suction pressure of the compressor;
comparing the inspiratory pressure to a set pressure threshold;
when the suction pressure is smaller than the set pressure threshold value, controlling an outdoor bypass electromagnetic valve connected with the compressor in parallel to be closed and keeping the outdoor bypass electromagnetic valve for a first preset time period;
after the first preset time period, controlling the outdoor bypass electromagnetic valve to be disconnected;
detecting indoor temperature corresponding to the running indoor unit;
comparing the indoor temperature with a set target temperature;
and when the indoor temperature is lower than the corresponding set target temperature, controlling a fan of the indoor unit to stop and controlling an indoor electromagnetic valve of the indoor unit to be disconnected. When the suction pressure is smaller than the set pressure threshold, the situation shows that the risk of immediate shutdown exists when the suction pressure is too small. Therefore, the outdoor bypass electromagnetic valve connected with the compressor in parallel is controlled to be closed and kept for the first preset time period, so that the pressure of the high-pressure side of the compressor can flow to the low-pressure side along the pipeline where the outdoor bypass electromagnetic valve is located, and the suction pressure is improved. Further, the indoor temperature corresponding to the running indoor unit is detected, and when the indoor temperature reaches the set target temperature, the refrigeration requirement of the indoor unit is met, so that the fan of the indoor unit is controlled to stop, and the corresponding indoor electromagnetic valve is switched off.
In a preferred embodiment of the above method for controlling a multi-split refrigeration and freezing unit, when the suction pressure is greater than or equal to the set pressure threshold, the anti-mis-stop mode further includes:
obtaining the power-off duration of the indoor unit which is powered off at the latest;
comparing the power-off duration of the indoor unit which is powered off at the latest with a second preset time period;
if the power-off duration of the indoor unit which is powered off at the latest is greater than or equal to the second preset time period, detecting the indoor temperature corresponding to the running indoor unit;
comparing the indoor temperature with a set target temperature;
and when the indoor temperature is lower than the corresponding set target temperature, controlling a fan of the indoor unit to stop and controlling an indoor electromagnetic valve of the indoor unit to be disconnected. When the indoor unit is shut down, the load on the refrigeration system is reduced and the suction pressure of the compressor is reduced accordingly. However, the change in the suction pressure is not instantaneous, but requires a certain reaction time. By setting the second predetermined time period, the suction pressure has sufficient reaction time, so as to judge whether the outdoor bypass electromagnetic valve needs to be opened more accurately. When the suction pressure is greater than or equal to the set pressure threshold, the compressor is indicated to operate normally, and the risk of stopping the compressor is not existed temporarily. After the second preset time period, the suction pressure is still larger than or equal to the set pressure threshold, which indicates that the compressor operates normally, and the outdoor bypass electromagnetic valve is not required to be opened to adjust the suction pressure. Further, the corresponding indoor temperature of the running indoor unit is detected, and when the indoor temperature reaches the set target temperature, the refrigeration requirement of the indoor unit is met, so that the fan of the indoor unit is controlled to stop, and the corresponding indoor electromagnetic valve is switched off.
In a preferred technical solution of the control method for a multi-split refrigeration and freezing unit, when the indoor solenoid valve of the indoor unit is controlled to be turned off, the anti-mis-stop mode further includes:
detecting a suction pressure of the compressor;
comparing the suction pressure to a set shutdown pressure;
controlling the compressor to stop when the suction pressure is less than the set stop pressure and keeps for a third preset time period,
wherein the set pressure threshold is greater than the set shutdown pressure. When the running indoor units are shut down, the refrigeration requirements of all the indoor units are met, and the compressor is controlled to shut down based on the comparison result of the suction pressure and the set shutdown pressure. Furthermore, the set pressure threshold is larger than the set shutdown pressure, so that timely adjustment can be ensured when the suction pressure is too small to avoid shutdown. Further, the suction pressure is less than the set shutdown pressure and maintained for the third predetermined period of time to determine that the condition of the suction pressure being less than the set shutdown pressure is stable, i.e., to avoid a situation where the suction pressure first falls below the set shutdown pressure and then suddenly rises above the set shutdown pressure.
In the above preferred technical solution of the control method for a multi-split refrigeration and freezing unit, when the number of starts of the indoor unit is equal to 0, the compressor enters a normal stop mode. When the starting number of the indoor units is equal to 0, the refrigeration requirements of all the indoor units are met, and the compressor is controlled to enter a normal shutdown mode.
In a preferred embodiment of the above method for controlling a multi-split refrigeration and freezing unit, the normal shutdown mode includes:
detecting a suction pressure of the compressor;
comparing the suction pressure to a set shutdown pressure;
and when the suction pressure is smaller than the set shutdown pressure and is kept for a third preset time period, controlling the compressor to be shut down. The keeping of the state where the suction pressure is less than the set shutdown pressure for the third predetermined period of time is to avoid a situation where the suction pressure is suddenly increased to exceed the set shutdown pressure after being lower than the set shutdown pressure due to reasons such as the indoor solenoid valve not being fully closed.
In a preferred embodiment of the above method for controlling a multi-split refrigeration and freezing unit, the method further includes:
and when the starting number of the indoor unit is more than or equal to 2, the compressor enters a normal operation mode. When the starting number of the indoor unit is more than or equal to 2, the refrigeration requirement of the indoor unit is far from being met, the load of a refrigeration system is large, the suction pressure of the compressor is high, and the possibility of error shutdown does not exist, so that the compressor is controlled to enter a normal operation mode.
In order to solve the above problems in the prior art, that is, to solve the technical problem of the conventional one-to-many refrigerating and freezing unit that a compressor is stopped by mistake, the present invention further provides a one-to-many refrigerating and freezing unit, wherein the one-to-many refrigerating and freezing unit comprises a compressor, and the one-to-many refrigerating and freezing unit controls the operation or the stop of the compressor by using the control method according to any one of the above. By using the control method, the one-drive-many refrigerating and freezing unit can accurately control the running or the stop of the compressor based on the starting number of the indoor units, thereby effectively avoiding the condition of the error stop of the compressor and meeting the refrigeration requirements of all the indoor units.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a system schematic of an embodiment of a one-to-many refrigeration and freezing assembly of the present invention;
fig. 2 is a flow chart of a method of controlling a multi-split refrigeration and freezing assembly in accordance with the present invention;
fig. 3 is a flow chart of an embodiment of a method of controlling a multi-split refrigeration and freezing assembly of the present invention;
list of reference numerals:
1. a plurality of refrigerating and freezing units; 11. an outdoor unit; 111. a compressor; 111a, compressor heating belt; 112a, an exhaust pipe; 112b, liquid pipe; 112c, a gas pipe; 112d, an air suction pipe; 113. a high voltage protection switch; 114. an oil separator; 115. an oil return capillary tube; 116. a one-way valve; 117. a high pressure sensor; 118. an outdoor heat exchanger; 119. a high pressure reservoir; 119a, a high-pressure reservoir heating belt; 120. drying the filter; 121. a liquid viewing mirror; 122. a liquid pipe stop valve; 123. an air pipe stop valve; 124. a gas-liquid separator; 125. a low pressure sensor; 126. a hot defrosting bypass pipeline; 127. a hot defrosting stop valve; 128. an outdoor balanced bypass line; 129. an outdoor bypass electromagnetic valve; 21. an indoor unit; 21a, a first indoor unit; 21b, a second indoor unit; 21c, a third indoor unit; 211a, a first indoor heat exchanger; 211b, a second indoor heat exchanger; 211c, a third indoor heat exchanger; 212a, a first expansion valve; 212b, a second expansion valve; 212c, a third expansion valve; 213a, a first indoor solenoid valve; 213b, a second indoor solenoid valve; 213c, a third indoor solenoid valve.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The invention provides a control method of a multi-split refrigeration and freezing unit, aiming at solving the technical problem of the error halt of a compressor of the existing multi-split refrigeration and freezing unit. A multi-split refrigeration and freezing unit 1 comprising a compressor 111, the control method comprising:
acquiring the starting number of indoor units of one-to-many refrigerating and freezing unit (step S1);
based on the number of the indoor units turned on, the compressor is controlled to enter an anti-misoperation mode or a normal shutdown mode (step S2).
Figure 1 is a system schematic of an embodiment of a one-drag-multiple refrigeration-freezer unit of the present invention. As shown in fig. 1, in one or more embodiments, the one-drive-multiple refrigerator-freezer unit 1 includes an outdoor unit 11 (which is generally disposed in an outdoor environment) and three indoor units 21 (which are generally disposed indoors or in a room). The three indoor units 21 may be arranged in the same or different configurations according to actual needs. Alternatively, the one-to-many refrigerating and freezing unit 1 may be provided with two, four or another suitable number of indoor units.
As shown in fig. 1, in one or more embodiments, the outdoor unit 11 mainly includes a compressor 111, an outdoor heat exchanger 118, a high-pressure accumulator 119, and a gas-liquid separator 124; the indoor units 21 include a first indoor unit 21a, a second indoor unit 21b, and a third indoor unit 21c connected in parallel. The first indoor unit 21a mainly includes a first indoor heat exchanger 211a, a first expansion valve 212a, and a first indoor solenoid valve 213 a; the second indoor unit 21b mainly includes a second indoor heat exchanger 211b, a second expansion valve 212b, and a second indoor solenoid valve 213 b; the third indoor unit 21c mainly includes a third indoor heat exchanger 211c, a third expansion valve 212c, and a third indoor solenoid valve 213 c. The compressor 111 has a discharge port and a suction port (not shown). The discharge port of the compressor 111 is connected to the input end of the outdoor heat exchanger 118 through a discharge pipe 112 a; the output end of the outdoor heat exchanger 118 is connected to the high-pressure reservoir 119, the expansion valve of each indoor unit 21, and the indoor heat exchanger in this order through the liquid pipe 112 b; each indoor heat exchanger is connected to an inlet port of the gas-liquid separator 124 through a gas pipe 112c, and an outlet port of the gas-liquid separator 124 is connected to an inlet port of the compressor 111 through a suction pipe 112d, thereby being interconnected to form a refrigeration cycle allowing a refrigerant to flow therein.
As shown in FIG. 1, in one or more embodiments, the compressor 111 is an inverter compressor. Alternatively, the compressor 111 may include two or more compressors in parallel. These compressors may be all inverter compressors or may include some inverter compressors. In one or more embodiments, a high pressure protection switch 113 is disposed on the discharge line 112a near the discharge of the compressor 111 to provide shutdown protection when the discharge pressure of the compressor 111 is too high. In one or more embodiments, an oil separator 114 is disposed on the gas discharge pipe 112a, wherein a gas input end of the oil separator 114 is connected to a gas discharge port of the compressor 111; the gas output of the oil separator 114 is connected to the input of the outdoor heat exchanger 118 through the gas discharge pipe 112 a; the oil return discharge end of the oil separator 114 is connected to an oil return capillary tube 115 and is connected to the suction port of the compressor 111 through a pipe so as to return the lubricating oil to the compressor 111 in time. In one or more embodiments, a compressor heating belt 111a is provided at the bottom of the compressor 111 to preheat the compressor 111 when needed. In one or more embodiments, a check valve 116 for preventing the refrigerant from flowing backwards and a high pressure sensor 117 for detecting the discharge pressure of the compressor 111 are further disposed on the discharge pipe 112a, and both the check valve 116 and the pressure sensor 117 are located downstream of the gas output end of the oil separator 114.
As shown in fig. 1, in one or more embodiments, the outdoor heat exchanger 118 may be, but is not limited to, a finned coil heat exchanger or a plate heat exchanger, and is equipped with an outdoor heat exchanger fan (not shown). The high pressure accumulator 119 may receive the liquid refrigerant condensed by the outdoor heat exchanger 118 to adjust and ensure a refrigerant circulation amount in the refrigeration system. In one or more embodiments, a high pressure accumulator heating belt 119a is provided on the high pressure accumulator 119 to preheat the liquid refrigerant, ensuring accurate supply of the refrigerant. A dry filter 120, a sight glass 121, and a liquid pipe shutoff valve 122 are also connected in series in this order to the liquid pipe 112b downstream of the high-pressure accumulator 119. The desiccant filter 120 may dry moisture in the liquid refrigerant, the liquid viewing mirror 121 may be used to observe a flow condition of the liquid refrigerant and detect a water content in the liquid refrigerant, and the liquid tube stop valve 122 may help to temporarily store the liquid refrigerant in the refrigeration cycle loop outside the room, so as to facilitate the assembly, disassembly, maintenance, and maintenance of the multi-split refrigeration and freezing unit 1. In one or more embodiments, corresponding first, second, and third indoor solenoid valves 213a, 213b, and 213c are further provided at positions of the liquid pipe 112b upstream of the first, second, and third expansion valves 212a, 212b, and 212c, respectively, to control the liquid refrigerant to flow into the corresponding first, second, and third indoor units 21a, 21b, and 21 c.
As shown in fig. 1, in one or more embodiments, the first expansion valve 212a, the second expansion valve 212b, and the third expansion valve 212c are thermostatic expansion valves. Alternatively, the first expansion valve 212a, the second expansion valve 212b, and the third expansion valve 212c may also be electronic expansion valves, or other suitable expansion valves. The first, second, and third indoor heat exchangers 211a, 211b, and 211c include, but are not limited to, fin-and-coil heat exchangers or plate heat exchangers, and are provided with corresponding indoor heat exchanger fans (not shown in the drawings). The gas pipe 112c is further provided with a gas pipe shutoff valve 123 to assist the refrigerant in the refrigeration cycle circuit to be temporarily stored outside the room in cooperation with the liquid pipe shutoff valve 122.
As shown in fig. 1, in one or more embodiments, a low pressure sensor 125 is further disposed on the suction pipe 112d to detect a suction pressure of the compressor 111. In one or more embodiments, a hot defrosting bypass pipeline 126 is connected in parallel between the gas output end close to the oil-gas separator 114 and the output end of each indoor heat exchanger, and a hot defrosting stop valve 127 is arranged on the hot defrosting bypass pipeline 126, so that when the corresponding indoor heat exchanger needs defrosting, the hot defrosting stop valve 127 is opened, and the high-temperature and high-pressure gaseous refrigerant output from the exhaust port of the compressor 111 is allowed to be directly conveyed to the corresponding indoor heat exchanger through the hot defrosting bypass pipeline 126 for defrosting treatment. In one or more embodiments, an outdoor balance bypass line 128 is connected in parallel between the exhaust pipe 112a and the suction pipe 112d, and an outdoor bypass solenoid valve 129 is disposed on the outdoor balance bypass line 128.
When the multi-split refrigeration and freezing unit 1 receives a refrigeration instruction, the compressor 111 starts to start, and the refrigerant (for example, R410a) is compressed by the compressor 111 and then enters the outdoor heat exchanger 113 (which serves as a condenser) through the exhaust pipe 112 a. In the outdoor heat exchanger 113, the high-temperature and high-pressure gas refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant by transferring heat to an air flow caused by the outdoor heat exchanger fan. The high-temperature and high-pressure liquid refrigerant flows through the high-pressure accumulator 119, the dry filter 120, the liquid level indicator 121, and the liquid pipe shutoff valve 122 in this order, and flows to the expansion valve of the corresponding indoor unit 21. In the expansion valve, the high-temperature and high-pressure liquid refrigerant is throttled to a low-temperature and low-pressure liquid refrigerant, and then distributed to the corresponding indoor heat exchangers (one or more of the first, second, and third indoor heat exchangers 211a, 211b, and 211 c). The low-temperature low-pressure liquid refrigerant is evaporated into a low-temperature low-pressure gas refrigerant by absorbing heat of the indoor air, and the corresponding indoor air is cooled. The low-temperature and low-pressure gaseous refrigerant exits the corresponding indoor heat exchanger, passes through the corresponding gas pipe 112c and the gas pipe shutoff valve 123, and then enters the gas-liquid separator 124. The gas-liquid separated refrigerant gas is sucked into the compressor 111 through the suction port. A complete refrigeration cycle is completed and such refrigeration cycle can be performed without interruption in order to achieve the target refrigeration temperature.
The control method of the one-to-many refrigerator-freezer unit according to the present invention will be described in detail based on the above-described one-to-many refrigerator-freezer unit 1. It should be noted that the control method of the present invention can also be used for other suitable refrigeration equipment.
Fig. 2 is a flow chart of a control method for a multi-split refrigeration and freezing unit according to the present invention. As shown in fig. 2, after the control method of the multi-split refrigeration and freezing unit 1 is started, step S1 is executed to obtain the number X of indoor units 21 of the multi-split refrigeration and freezing unit 1; then, based on the acquired number X of indoor units 21 turned on, the compressor 111 is controlled to enter the anti-false stop mode or the normal stop mode (step S2).
Fig. 3 is a flow chart of an embodiment of a method of controlling a multi-split refrigeration and freezing assembly of the present invention. As shown in fig. 3, the control method of the one-to-many refrigerating and freezing unit 1 detects the indoor temperature T corresponding to each indoor unit 21 after the startn(step S10). Indoor temperature TnIs the indoor ambient temperature, such as the temperature in the warehouse. Indoor temperature TnThe temperature may be measured from the air inlet of the indoor unit 21 or other suitable indoor position, and the corresponding indoor temperature T of each indoor unit 21 is detectednCorresponding set target temperature TsComparison is performed (step S11). When indoor temperature TnLess than the set target temperature TsAt this time, the fan (not shown in the figure) of the corresponding indoor unit 21 is controlled to be stopped, and the corresponding indoor solenoid valves (one or more of the first, second, and third indoor solenoid valves 213a, 213b, and 213 c) are controlled to be turned off (step S12). When indoor temperature TnLess than the set target temperature TsWhen the temperature of the indoor side reaches the target temperature set by the user, the refrigeration requirement of the corresponding indoor unit 21 is met, and at this time, the corresponding fan is controlled to stop and the corresponding indoor solenoid valve is controlled to be turned off, so that the temperature of the indoor side is prevented from continuously decreasing and deviating from the target temperature set by the user. An off signal of each indoor solenoid valve, or a current signal or a power signal of the fan of each indoor unit 21 is acquired (step S13). Then, the number X of indoor units 21 turned on is determined based on the off signal of the indoor solenoid valve, or based on the current signal or the power signal of the fan (step S14). In one or more embodiments, the on/off signal of the indoor solenoid valve can be captured by the detection system of the multi-split refrigeration and freezing unit 1, so that the number X of the indoor units 21 is equal to the total number of the indoor units 21 minus the number of the indoor solenoid valves that are turned off. For example, indoorsThe total number of the indoor units 21 is 3, and the number X of the indoor units 21 is 1 when the detection system of the multi-split refrigeration and freezing unit 1 detects the off signals of the 2 indoor electromagnetic valves. In one or more embodiments, the number X of the indoor units 21 that are turned on may also be determined by obtaining a current signal or a power signal of the fan of each indoor unit 21. For example, the total number of the indoor units 21 is 3, and the detection system of the one-drive-many refrigerating and freezing unit 1 detects that the current signal or the power signal of the fan of 1 indoor unit 21 is 0 (which indicates that 1 indoor unit 21 is stopped), so the number X of the indoor units 21 is 2.
As shown in fig. 3, when the number X of indoor units 21 turned on is 1, the compressor 111 is controlled to enter the anti-false stop mode (step S21). Specifically, the suction pressure P of the compressor 111 is detecteds(step S210), the detected suction pressure P is usedsWith a predetermined pressure threshold value PfComparison is performed (step S211). When suction pressure PsLess than a predetermined pressure threshold PfAt this time, the outdoor bypass solenoid valve 129 is controlled to be closed and kept for the first preset time period t1(step S212). Suction pressure PsLess than a predetermined pressure threshold PfDescription of the suction pressure PsToo small, the compressor risks immediate shutdown. At this time, the outdoor bypass solenoid valve 129 connected in parallel with the compressor 111 is opened, so that the pressure of the high pressure side of the compressor 111 can flow to the low pressure side along the outdoor balance bypass line 128 to increase the suction pressure PsKeeping it at a normal level. After a first preset time period t1Thereafter, the outdoor bypass solenoid valve 129 is controlled to be turned off (step S213). After a first preset time period t1Rear, suction pressure PsGradually rises to reach a normal level, and the outdoor bypass solenoid valve 129 is timely disconnected at this time, so that the refrigerant does not enter the refrigeration cycle loop after flowing in the outdoor balance bypass pipeline 128 for a long time, and the refrigeration efficiency of the compressor 111 is not affected. In one or more embodiments, the pressure threshold P is presetfIs 300KPa (kilopascal). Alternatively, the pressure threshold P is presetfOther suitable pressure values are set to be greater or less than 300KPa (kilopascals). In one or more embodiments, the first preset time period t1It is 1min (min). SubstitutionGround, a first preset time period t1Set to be longer or shorter than 1min, or other suitable time. When the outdoor bypass solenoid valve 129 is turned off, the corresponding indoor temperature T of the operating indoor unit 21 is detectedn(step S214), the detected indoor temperature T is measurednAnd setting a target temperature TsComparison is performed (step S215). When indoor temperature TnIs greater than or equal to the set target temperature TsIn the meantime, since the indoor temperature has not yet reached the target temperature set by the user, the compressor 111 continues to operate, and the indoor temperature T corresponding to the operating indoor unit 21 is repeatedly detectednThe step (2). When indoor temperature TnLess than the set target temperature TsIn this case, the fan of the corresponding indoor unit is controlled to stop, and the corresponding indoor solenoid valve is controlled to be turned off (step S216). When indoor temperature TnLess than the set target temperature TsWhen the temperature of the indoor side reaches the target temperature set by the user, the compressor 111 may be stopped. Specifically, the suction pressure P of the compressor 111 is detecteds(step S220), the detected suction pressure P is usedsAnd a set stop pressure PtComparison is performed (step S221). When suction pressure PsLess than a set shutdown pressure PtAnd maintained for a third predetermined period of time t3After that, the compressor 111 is controlled to stop (step S222).
As shown in fig. 3, when the suction pressure P is highersGreater than or equal to a preset pressure threshold value PfThen, step S217 is executed to obtain the shutdown time period t of the indoor unit 21 that has been shutdown at the latesttAnd the stop time period t of the indoor unit 21 which is to be stopped at the latesttAnd a second predetermined time period t2Comparison is performed (step S218). When the indoor unit 21 is stopped, the load of the refrigeration system decreases, and the suction pressure P of the compressor 111 decreasessWill be reduced accordingly. However, the suction pressure PsIs not instantaneous and requires a certain reaction time. By setting a second predetermined time period t2So that the suction pressure PsThere is sufficient reaction time to more accurately determine whether the outdoor bypass solenoid valve 129 needs to be opened. The shutdown duration t of the indoor unit 21 if the latest shutdown occurstIs less than that ofTwo predetermined time periods t2Repeatedly detecting the suction pressure P of the compressor 111sThe step (2). The shutdown duration t of the indoor unit 21 if the latest shutdown occurstGreater than or equal to a second predetermined time period t2At this time, the suction pressure PsStill greater than the preset pressure threshold value PfNow, the stop of the indoor unit 21 and the suction pressure P will be describedsThe influence of (c) is not sufficient to cause a false shutdown of the compressor 111. In one or more embodiments, the second predetermined time period t2And 30s (seconds). Alternatively, the second predetermined period of time t2Set to be longer or shorter than 30s for other suitable times. The stop time period t of the indoor unit 21 at the latest stoptGreater than or equal to a second predetermined time period t2Then, the indoor temperature T corresponding to the operating indoor unit 21 is detectedn(go to step 214), and then measure the indoor temperature TnAnd setting a target temperature TsComparison is performed (step S215). When indoor temperature TnIs greater than or equal to the set target temperature TsIn the meantime, since the indoor temperature has not yet reached the target temperature set by the user, the compressor 111 continues to operate, and the indoor temperature T corresponding to the operating indoor unit 21 is repeatedly detectednThe step (2). When indoor temperature TnLess than the set target temperature TsIn this case, the fan of the corresponding indoor unit is controlled to stop, and the corresponding indoor solenoid valve is controlled to be turned off (step S216). When indoor temperature TnLess than the set target temperature TsWhen the temperature of the indoor side reaches the target temperature set by the user, the compressor 111 may be stopped. Specifically, the suction pressure P of the compressor 111 is detecteds(step S220), the detected suction pressure P is usedsAnd a set stop pressure PtComparison is performed (step S221). When suction pressure PsLess than a set shutdown pressure PtAnd maintained for a third predetermined period of time t3After that, the compressor 111 is controlled to stop (step S222).
Set shutdown pressure PtLess than a predetermined pressure threshold PfCan ensure the suction pressure PsWhen it is too small, the outdoor bypass solenoid valve 129 is closed in time to adjust the suction pressure PsAvoid compressionThe machine 111 is erroneously stopped. In one or more embodiments, the shutdown pressure P is sett280KPa (kilopascal), and a third set time period t3And was 20s (seconds). It will be appreciated that the shutdown pressure P is settThe application range of the working temperature of the multi-split refrigerating and freezing unit 1 and the evaporation temperature of the indoor unit 21 can be determined, and the user can set the working temperature according to actual needs. For example, when the working temperature of the multi-split refrigerating and freezing unit 1 is-20 ℃ to 50 ℃ and the application range of the evaporation temperature of the indoor unit 21 is-15 ℃ to 5 ℃, the shutdown pressure P is settThe value range of (A) is 250KPa to 350KPa (kilopascal), as long as the shutdown pressure P is settIs higher than a preset pressure threshold value PfIs small in size. Further, a third set time period t3Other suitable times longer or shorter than 20s may also be provided.
As shown in fig. 3, when the number X of indoor units 21 turned on is 0, the compressor 111 is controlled to enter the normal stop mode (step S22). When the number X of the indoor units 21 is 0, it indicates that all the cooling requirements of the indoor units 21 have been met, and the compressor 111 can be stopped. Specifically, the suction pressure P of the compressor 111 is detecteds(step S220), the detected suction pressure P is usedsAnd a set stop pressure PtComparison is performed (step S221). When suction pressure PsLess than a set shutdown pressure PtAnd maintained for a third predetermined period of time t3After that, the compressor 111 is controlled to stop (step S222).
As shown in fig. 3, when the number X of indoor units 21 turned on is greater than or equal to 2, the compressor 111 is controlled to enter the normal operation mode (step S23). When the number X of the indoor units 21 is greater than or equal to 2, it indicates that the refrigeration requirement of the indoor units 21 is far from being met, and at this time, the load of the refrigeration system is large, and the suction pressure P of the compressor 111 is highsHigher, there is no possibility of a false stop, and thus the compressor 111 is controlled to enter a normal operation mode, i.e., the opening degree of the corresponding expansion valve and/or the operation frequency of the compressor is adjusted according to the indoor load.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the invention, a person skilled in the art may combine technical features from different embodiments, and may make equivalent changes or substitutions for related technical features, and such changes or substitutions will fall within the scope of the invention.
Claims (10)
1. A method of controlling a multi-split refrigeration and freezing unit, the method comprising:
acquiring the starting number of the indoor units of the multi-split refrigerating and freezing unit;
and controlling the compressor to enter an anti-misoperation stop mode or a normal stop mode based on the starting number of the indoor unit.
2. A control method for a multi-split refrigeration and freezing unit according to claim 1, wherein the method for obtaining the number of on-times of the indoor unit comprises:
acquiring a disconnection signal of an indoor electromagnetic valve of each indoor unit; or acquiring a current signal or a power signal of a fan of each indoor unit;
and determining the starting number of the indoor unit based on the turn-off signal of the indoor electromagnetic valve or the current signal or the power signal of the fan.
3. A control method for a multi-split refrigeration and freezing unit as claimed in claim 2, wherein when the number of the indoor units is equal to 1, the compressor enters the anti-mis-stop mode.
4. A control method for a multi-split refrigeration and freezing unit as claimed in claim 3, wherein the anti-false stop mode comprises:
detecting a suction pressure of the compressor;
comparing the inspiratory pressure to a set pressure threshold;
when the suction pressure is smaller than the set pressure threshold value, controlling an outdoor bypass electromagnetic valve connected with the compressor in parallel to be closed and keeping the outdoor bypass electromagnetic valve for a first preset time period;
after the first preset time period, controlling the outdoor bypass electromagnetic valve to be disconnected;
detecting indoor temperature corresponding to the running indoor unit;
comparing the indoor temperature with a set target temperature;
and when the indoor temperature is lower than the corresponding set target temperature, controlling a fan of the indoor unit to stop and controlling an indoor electromagnetic valve of the indoor unit to be disconnected.
5. A control method for a multi-split refrigeration and freezing assembly according to claim 4, wherein when the suction pressure is equal to or greater than the set pressure threshold, the anti-mis-stop mode further comprises:
obtaining the power-off duration of the indoor unit which is powered off at the latest;
comparing the power-off duration of the indoor unit which is powered off at the latest with a second preset time period;
if the power-off duration of the indoor unit which is powered off at the latest is greater than or equal to the second preset time period, detecting the indoor temperature corresponding to the running indoor unit;
comparing the indoor temperature with a set target temperature;
and when the indoor temperature is lower than the corresponding set target temperature, controlling a fan of the indoor unit to stop and controlling an indoor electromagnetic valve of the indoor unit to be disconnected.
6. A control method for a multi-split refrigeration and freezing unit according to claim 4 or 5, wherein when the indoor solenoid valve controlling the indoor unit is turned off, the anti-mis-stop mode further comprises:
detecting a suction pressure of the compressor;
comparing the suction pressure to a set shutdown pressure;
controlling the compressor to stop when the suction pressure is less than the set stop pressure and keeps for a third preset time period,
wherein the set pressure threshold is greater than the set shutdown pressure.
7. A control method for a multi-split refrigeration and freezing unit as claimed in claim 1, wherein the compressor enters a normal stop mode when the number of on-times of the indoor units is equal to 0.
8. A control method for a multi-drag refrigeration chiller unit as set forth in claim 7 wherein said normal shutdown mode comprises:
detecting a suction pressure of the compressor;
comparing the suction pressure to a set shutdown pressure;
and when the suction pressure is smaller than the set shutdown pressure and is kept for a third preset time period, controlling the compressor to be shut down.
9. A control method for a multi-split refrigeration and freezing assembly according to claim 1, further comprising:
and when the starting number of the indoor unit is more than or equal to 2, the compressor enters a normal operation mode.
10. A multi-split refrigeration chiller unit comprising a compressor and wherein the multi-split refrigeration chiller unit controls the compressor to operate or shut down using a control method according to any one of claims 1 to 9.
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