CN115289730A - Refrigerating unit, unit control method and device - Google Patents
Refrigerating unit, unit control method and device Download PDFInfo
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- CN115289730A CN115289730A CN202211055713.9A CN202211055713A CN115289730A CN 115289730 A CN115289730 A CN 115289730A CN 202211055713 A CN202211055713 A CN 202211055713A CN 115289730 A CN115289730 A CN 115289730A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000010257 thawing Methods 0.000 claims abstract description 64
- 238000005057 refrigeration Methods 0.000 claims abstract description 50
- 239000003507 refrigerant Substances 0.000 claims abstract description 40
- 238000004590 computer program Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 3
- 230000006837 decompression Effects 0.000 abstract description 13
- 238000005485 electric heating Methods 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000003915 air pollution Methods 0.000 abstract description 4
- 230000008018 melting Effects 0.000 abstract description 4
- 238000002844 melting Methods 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 229910000743 fusible alloy Inorganic materials 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010977 unit operation 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
- F25B43/006—Accumulators
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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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)
- Defrosting Systems (AREA)
Abstract
The invention discloses a refrigerating unit, a unit control method and a unit control device. Wherein, refrigerating unit is including the compressor, oil separator, condenser, throttling element and the evaporimeter that connect gradually, and the evaporimeter is inside to be provided with defrosting pipeline and refrigeration pipeline, and refrigerating unit still includes: the first end of the pressure relief tank is connected to the air outlet of the oil separator, and the second end of the pressure relief tank is connected to the first end of the defrosting pipeline; the second end of the defrosting pipeline is connected to the air suction port of the compressor. According to the invention, by arranging the pressure relief tank, the refrigerant can be automatically relieved into the pressure relief tank, pressure relief devices such as the fusible plug and the pressure switch are not required to be added on the pipeline, the pipeline is simple, the phenomenon that the refrigerant leaks into the air to cause air pollution due to the melting of the fusible plug is avoided, and the influence on the normal use and after-sale maintenance of the unit due to the fact that the fusible plug cannot be recovered for continuous use is avoided. Meanwhile, the high-temperature and high-pressure refrigerant decompressed into the decompression tank can be automatically introduced into the evaporator to perform hot-gas defrosting, and compared with electric heating defrosting, the electric energy is saved.
Description
Technical Field
The invention relates to the technical field of units, in particular to a refrigerating unit, a unit control method and a unit control device.
Background
In the air conditioning refrigeration and freezing refrigeration industries, the defrosting of the indoor unit of the refrigeration house generally adopts electric heating defrosting, so that the power consumption is high, and the energy is not saved.
In order to meet the safety certification (for example, UL certification), a fusible plug, a pressure relief device such as a pressure switch, and the like are added to a refrigeration system pipeline, so that the pipeline is complicated. When the refrigeration system works, if the pressure of the oil separator suddenly rises, the temperature of a refrigerant can also rise along with the pressure of the oil separator, when the temperature rises to the melting temperature of the fusible alloy, the fusible alloy is immediately melted to form a gap, and the refrigerant in the oil separator is released into the atmosphere to realize pressure relief, so that the safety of people and equipment is protected; and the fusible plug can not be recovered to be used after being melted, thereby influencing the normal use of the unit and causing great trouble for after-sale maintenance.
The problem that defrosting power consumption of a refrigerating unit is large, a temperature and pressure control pipeline is complex and not environment-friendly, and normal use of the refrigerating unit can be influenced after a fusible plug is melted in the prior art is solved.
Disclosure of Invention
The embodiment of the invention provides a refrigerating unit, a unit control method and a unit control device, and at least solves the problems that in the prior art, defrosting power consumption of the refrigerating unit is high, a temperature and pressure control pipeline is complex and not environment-friendly, and normal use of the unit is influenced after a fusible plug is melted.
In order to solve the technical problem, an embodiment of the present invention provides a refrigeration unit, including a compressor, an oil separator, a condenser, a throttling element, and an evaporator, which are connected in sequence, wherein a defrosting pipeline and a refrigeration pipeline are disposed inside the evaporator, and the refrigeration unit further includes:
a first end of the pressure relief tank is connected to an air outlet of the oil separator, and a second end of the pressure relief tank is connected to a first end of the defrosting pipeline;
the second end of the defrosting pipeline is connected to the air suction port of the compressor.
Optionally, a first valve is arranged on a connecting pipeline between the first end of the pressure relief tank and the air outlet of the oil separator; and a second valve is arranged on a connecting pipeline between the second end of the pressure relief tank and the first end of the defrosting pipeline.
Optionally, a third valve is arranged on a connecting pipeline between the second end of the defrosting pipeline and the air suction port of the compressor.
Optionally, the refrigeration unit further includes: the pressure sensor is arranged on a connecting pipeline between an air outlet of the oil separator and the condenser and used for detecting exhaust pressure; and/or the first temperature sensor is arranged on a pipeline connected with an exhaust port of the compressor and used for detecting the exhaust temperature.
Optionally, the refrigeration unit further includes: the second temperature sensor is arranged at the inlet of the refrigeration pipeline and used for detecting the temperature of an inlet refrigerant of the refrigeration pipeline; and the third temperature sensor is arranged at the outlet of the refrigeration pipeline and used for detecting the temperature of the outlet refrigerant of the refrigeration pipeline.
Optionally, the refrigeration unit further includes: and the air quantity sensor is used for detecting the air quantity of the fan corresponding to the evaporator.
The embodiment of the invention also provides a unit control method, which is applied to the refrigerating unit provided by the embodiment of the invention, and the method comprises the following steps:
detecting specified parameters of the refrigerating unit;
and controlling the refrigerating unit to release pressure and/or defrost an evaporator according to the designated parameters.
Optionally, according to the specified parameter, controlling the refrigeration unit to perform pressure relief and/or defrosting on the evaporator includes:
controlling the first valve, the second valve and the third valve according to the designated parameters to release pressure and/or defrost the evaporator;
the first valve is arranged on a connecting pipeline between the first end of the pressure relief tank and an air outlet of the oil separator; the second valve is arranged on a connecting pipeline between the second end of the pressure relief tank and the first end of the defrosting pipeline; and the third valve is arranged on a connecting pipeline between the second end of the defrosting pipeline and the air suction port of the compressor.
Optionally, the specifying parameters include: exhaust temperature and/or exhaust pressure;
controlling a first valve, a second valve and a third valve according to the specified parameters to carry out pressure relief, comprising:
when the exhaust temperature is higher than an exhaust temperature set value and/or the exhaust pressure is higher than an exhaust pressure set value, opening the first valve, and controlling the second valve and the third valve according to a preset rule;
and when the exhaust temperature is less than or equal to an exhaust temperature set value and/or the exhaust pressure is less than or equal to an exhaust pressure set value, closing the first valve, the second valve and the third valve.
Optionally, controlling the second valve and the third valve according to a preset rule includes: opening the second valve and the third valve; or, the second valve and the third valve are controlled according to whether defrosting is needed.
Optionally, the specifying parameters include: heat exchange temperature difference of the evaporator;
controlling a first valve, a second valve and a third valve according to the designated parameters to defrost an evaporator, comprising:
when the heat exchange temperature difference is less than or equal to a superheat degree set value, opening the first valve, the second valve and the third valve;
and when the heat exchange temperature difference is larger than a superheat degree set value, closing the first valve, the second valve and the third valve.
Optionally, the specifying parameters include: the air quantity of a fan corresponding to the evaporator;
controlling a first valve, a second valve and a third valve according to the designated parameters to defrost an evaporator, comprising:
when the rotating speed of the fan is unchanged and the air volume is reduced, opening the first valve, the second valve and the third valve;
and when the rotating speed of the fan is unchanged and the air volume is not reduced, closing the first valve, the second valve and the third valve.
The embodiment of the invention also provides a unit control device, which is applied to the refrigerating unit in the embodiment of the invention, and the device comprises:
the detection module is used for detecting the designated parameters of the refrigerating unit;
and the control module is used for controlling the refrigerating unit to release pressure and/or defrost the evaporator according to the specified parameters.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method according to the embodiments of the present invention.
By applying the technical scheme of the invention, the refrigerant can be automatically decompressed into the decompression tank by arranging the decompression tank, decompression devices such as the fusible plug and the pressure switch are not required to be added on the pipeline, the pipeline is simple, the air pollution caused by the refrigerant leaking into the air due to the melting of the fusible plug is avoided, and the influence on the normal use and after-sale maintenance of the unit due to the fact that the fusible plug cannot be recovered for continuous use is avoided. Meanwhile, the high-temperature and high-pressure refrigerant decompressed into the decompression tank can be automatically introduced into the evaporator to defrost by hot gas, the frost layer on the surface of the evaporator is automatically melted, and compared with electric heating defrosting, the hot gas defrosting can save electric energy by about 50%.
Drawings
FIG. 1 is a schematic diagram of a refrigeration unit according to one embodiment of the present invention;
fig. 2 is a flowchart of a unit control method according to a second embodiment of the present invention;
fig. 3 is a block diagram of a unit control device according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
An alternative embodiment of the present invention is described in detail below with reference to the drawings.
Example one
Fig. 1 is a schematic diagram of a refrigeration unit according to an embodiment of the present invention, and as shown in fig. 1, the refrigeration unit includes a compressor 1, an oil separator 2, a condenser 3, a throttling element 4, an evaporator 5, and a gas-liquid separator 6, which are connected in sequence.
The gas-liquid mixture is discharged from an exhaust port of the compressor 1 and enters the oil separator 2, after the high-temperature and high-pressure gas-liquid mixture is separated by the oil separator 2, the separated liquid returns to an air suction port of the compressor 1 from the bottom of the oil separator 2 through an oil return electromagnetic valve 21, the oil return electromagnetic valve 21 is controlled to be switched by a mainboard controller, when the oil is detected at the bottom of the oil separator 2 or the system lacks oil, the oil return electromagnetic valve 21 is switched on, otherwise, the oil return electromagnetic valve 21 is switched off. The high-temperature high-pressure gas comes out from the gas outlet of the oil separator 2, enters the condenser 3, is condensed by the condenser 3 to become low-temperature high-pressure liquid, is throttled by the throttling element 4 to become low-temperature low-pressure liquid, enters the evaporator 5 to be evaporated, and then becomes low-temperature low-pressure gas which returns to the gas suction port of the compressor 1, and the low-temperature low-pressure gas is compressed by the compressor to become a high-temperature high-pressure gas-liquid mixture, so that a refrigeration cycle is completed.
The evaporator 5 is internally provided with a defrosting pipeline and a refrigerating pipeline which are mutually independent, so that the normal refrigerating effect cannot be influenced by hot gas defrosting.
The refrigerating unit further comprises: a first end of the pressure relief tank 7 is connected to an air outlet of the oil separator 2, and a second end of the pressure relief tank 7 is connected to a first end of the defrosting pipeline; the second end of the defrosting pipe is connected to the suction port of the compressor 1.
The refrigerating unit of this embodiment, through setting up pressure release jar 7, the refrigerant can automatic pressure release to pressure release jar 7 in, need not to increase pressure relief devices such as fusible plug, pressure switch on the pipeline, and the pipeline is simple, avoids fusible plug to melt and makes the refrigerant leak and lead to air pollution in the air, avoids influencing unit normal use and after-sale maintenance because of the unable recovery continuation of fusible plug. Meanwhile, the high-temperature and high-pressure refrigerant decompressed into the decompression tank 7 can be automatically introduced into the evaporator 5 to be defrosted by hot gas, the frost layer on the surface of the evaporator 5 is automatically defrosted, and compared with electric heating defrosting, the hot gas defrosting can save about 50% of electric energy.
A first valve 8 is arranged on a connecting pipeline between the first end of the pressure relief tank 7 and the air outlet of the oil separator 2. Whether or not to release the pressure can be controlled by opening and closing the first valve 8.
A second valve 9 is arranged on a connecting pipeline between the second end of the pressure relief tank 7 and the first end of the defrosting pipeline. By opening and closing the second valve 9, whether the refrigerant flows into the defrosting pipeline of the evaporator 5 or not can be controlled, so that whether the evaporator 5 is defrosted or not can be controlled.
A third valve 10 is arranged on a connecting pipeline between the second end of the defrosting pipeline and the air suction port of the compressor 1. The third valve 10 prevents the refrigerant from flowing backward into the evaporator 5.
The first valve 8, the second valve 9, and the third valve 10 may be valves having an on-off control function, such as solenoid valves.
The refrigerating unit further comprises: a pressure sensor 11, which is arranged on a connecting pipeline between the air outlet of the oil separator 2 and the condenser 3 and is used for detecting the exhaust pressure; and/or, a first temperature sensor 12 is provided on a pipe connected to an exhaust port of the compressor 1, for detecting an exhaust temperature. Whether the refrigerating unit needs pressure relief or not can be judged according to the exhaust pressure and/or the exhaust temperature, namely, the opening and closing of the first valve 8 can be controlled according to the parameters detected by the pressure sensor 11 and/or the first temperature sensor 12, so that the pressure relief control is realized.
The refrigerating unit further comprises: a second temperature sensor 13 and a third temperature sensor 14. And a second temperature sensor 13 disposed at an inlet of the refrigeration pipeline, for detecting an inlet refrigerant temperature of the refrigeration pipeline. And a third temperature sensor 14, disposed at an outlet of the refrigeration pipeline, for detecting an outlet refrigerant temperature of the refrigeration pipeline. Through the second temperature sensor 13 and the third temperature sensor 14, the heat exchange temperature difference of the evaporator 5 can be obtained to be used as a basis for judging whether the evaporator 5 needs defrosting. Specifically, the temperature difference obtained by subtracting the inlet refrigerant temperature of the refrigeration pipeline from the outlet refrigerant temperature of the refrigeration pipeline is the heat exchange temperature difference of the evaporator 5. The opening and closing of the first valve 8, the second valve 9, and the third valve 10 can be controlled according to the temperatures detected by the second temperature sensor 13 and the third temperature sensor 14, thereby realizing the hot-gas defrosting control.
The refrigerating unit further comprises: and the air quantity sensor 15 is used for detecting the air quantity of the fan corresponding to the evaporator 5. The surface of the evaporator 5 is frosted, so that no gap is available for air circulation, and the air quantity passing through the evaporator 5 can be acquired through the air quantity sensor 15 to be used as a basis for judging whether the evaporator 5 needs defrosting. The opening and closing of the first valve 8, the second valve 9, and the third valve 10 can be controlled based on the air volume detected by the air volume sensor 15, thereby realizing the hot-air defrosting control.
It should be noted that, as for the sensors participating in the defrosting control, the refrigeration unit may include only the second temperature sensor 13 and the third temperature sensor 14, may include only the air volume sensor 15, and may include both the second temperature sensor 13, the third temperature sensor 14, and the air volume sensor 15, according to actual needs. Namely, defrosting is controlled according to the heat exchange temperature difference of the evaporator 5 and/or the air volume of the fan corresponding to the evaporator 5.
Example two
The embodiment provides a unit control method, which is applied to the refrigeration unit described in the above embodiment.
Fig. 2 is a flowchart of a unit control method provided in the second embodiment of the present invention, and as shown in fig. 2, the method includes the following steps:
s201, detecting the designated parameters of the refrigerating unit.
And S202, controlling the refrigerating unit to release pressure and/or defrost the evaporator according to the designated parameters.
The specified parameters of the present embodiment include a pressure release parameter and a defrosting parameter. The pressure relief parameter refers to a parameter that can determine whether the refrigeration unit needs to be relieved, such as the discharge temperature and/or the discharge pressure. The defrosting parameter refers to a parameter capable of determining whether the evaporator needs defrosting, for example, a heat exchange temperature difference of the evaporator and/or an air volume of a fan corresponding to the evaporator.
According to the unit control method, the refrigerant can be automatically decompressed into the decompression tank, decompression devices such as the fusible plug and the pressure switch are not required to be added on the pipeline, the pipeline is simple, air pollution caused by the fact that the refrigerant leaks into the air due to melting of the fusible plug is avoided, and influence on normal use and after-sale maintenance of the unit due to the fact that the fusible plug cannot be recovered to be used is avoided. Meanwhile, the high-temperature and high-pressure refrigerant decompressed into the decompression tank can be automatically introduced into the evaporator to be defrosted by hot gas, the frost layer on the surface of the evaporator is automatically defrosted, and compared with electric heating defrosting, the electric energy is saved. The unit is controlled to release pressure and/or defrost according to the designated parameters of the refrigerating unit, so that intelligent temperature and pressure control and defrosting control are realized.
According to the appointed parameter, control refrigerating unit carries out the pressure release and/or carries out the defrosting to the evaporimeter, include: the first valve 8, the second valve 9 and the third valve 10 are controlled according to specified parameters to allow pressure relief and/or defrost the evaporator. Wherein, the first valve 8 is arranged on a connecting pipeline between the first end of the pressure relief tank 7 and the air outlet of the oil separator 2; the second valve 9 is arranged on a connecting pipeline between the second end of the pressure relief tank 7 and the first end of the defrosting pipeline; the third valve 10 is disposed on a connection line between the second end of the defrosting line and the suction port of the compressor 1. The specified parameters are automatically sensed by the sensor, and the opening and closing of the related valve are automatically controlled according to the sensed specified parameters, so that the automatic intelligent control of pressure relief and/or defrosting is realized.
The above-mentioned specified parameters may include: exhaust temperature and/or exhaust pressure. Accordingly, the first valve 8, the second valve 9 and the third valve 10 are controlled according to the specified parameters to perform the pressure relief, including: when the exhaust temperature is higher than the exhaust temperature set value and/or the exhaust pressure is higher than the exhaust pressure set value, the first valve 8 is opened, and the second valve 9 and the third valve 10 are controlled according to a preset rule; when the exhaust temperature is less than or equal to the exhaust temperature set point, and/or the exhaust pressure is less than or equal to the exhaust pressure set point, the first valve 8, the second valve 9, and the third valve 10 are closed.
Further, the second valve 9 and the third valve 10 are controlled according to a preset rule, including: opening the second valve 9 and the third valve 10; alternatively, the second valve 9 and the third valve 10 are controlled according to whether defrosting is required. That is, when the first valve 8 is opened to release the pressure, the second valve 9 and the third valve 10 may be opened by default to defrost the evaporator 5, or the second valve 9 and the third valve 10 may be controlled according to an actual defrosting demand.
Illustratively, in the unit operation process, due to different operation conditions, an exhaust temperature may be too high, when the exhaust temperature detected by the first temperature sensor 12 is greater than an exhaust temperature set value a, pressure corresponding to a system refrigerant temperature point is also synchronously too high, in order to ensure that the system refrigerant temperature maintains a constant value, and prevent the unit from being incapable of continuously operating or even damaged due to the too high refrigerant temperature, at this time, the main board controller sends an instruction signal to control the first valve 8, the second valve 9 and the third valve 10 to be opened simultaneously, a part of high-temperature high-pressure gas output from the air outlet of the oil separator 2 is automatically decompressed into the decompression tank 7, and at the same time, the high-temperature high-pressure gas is introduced into the evaporator 5 to automatically melt a frost layer on the surface of the evaporator 5, so as to achieve the purpose of automatic hot gas defrosting, no electric heating is needed, energy and electricity are saved, and the other part of the refrigerant output from the air outlet of the oil separator 2 continues to perform refrigeration operation through the refrigeration cycle loop. When the exhaust temperature detected by the first temperature sensor 12 is less than or equal to the exhaust temperature set value a, it indicates that the temperature of the system refrigerant is constant, and at this time, the main board controller sends out an instruction signal to control the first valve 8, the second valve 9 and the third valve 10 to be closed at the same time, and all the refrigerants output from the air outlet of the oil separator 2 are cooled by the refrigeration cycle loop.
In the operation process of the unit, due to different operation conditions, the situation of excessively high exhaust pressure may occur, when the exhaust pressure detected by the pressure sensor 11 is greater than the exhaust pressure set value B, the temperature corresponding to the system refrigerant pressure point is also excessively high synchronously, in order to ensure that the system refrigerant pressure maintains a constant value, and prevent the unit from being incapable of continuously operating or even damaged due to excessively high refrigerant pressure, at this time, the main board controller sends a command signal to control the first valve 8, the second valve 9 and the third valve 10 to be opened simultaneously, a part of high-temperature and high-pressure gas output from the air outlet of the oil separator 2 is automatically decompressed into the decompression tank 7, and at the same time, the high-temperature and high-pressure gas is introduced into the evaporator 5 to automatically melt the frost layer on the surface of the evaporator 5, so as to achieve the purpose of automatic hot gas defrosting, no electric heating is needed, energy and electricity are saved, and another part of refrigerant output from the air outlet of the oil separator 2 continues to perform refrigerating operation through a refrigerating circulation loop. When the pressure sensor 11 detects that the discharge pressure is less than or equal to the discharge pressure set value B, it indicates that the system refrigerant pressure is constant, and at this time, the main board controller sends out a command signal to control the first valve 8, the second valve 9, and the third valve 10 to be closed at the same time, and all the refrigerants output from the gas outlet of the oil separator 2 are cooled through the refrigeration cycle loop.
The above-mentioned specified parameters may include: the heat exchange temperature difference of the evaporator 5. Accordingly, controlling the first valve 8, the second valve 9 and the third valve 10 according to the specified parameters to defrost the evaporator comprises: when the heat exchange temperature difference is less than or equal to the superheat degree set value, a first valve 8, a second valve 9 and a third valve 10 are opened; and when the heat exchange temperature difference is larger than the superheat degree set value, closing the first valve 8, the second valve 9 and the third valve 10.
Δ t = t1-t2, where Δ t represents the heat exchange temperature difference of the evaporator 5, t1 represents the temperature detected by the third temperature sensor 14, and t2 represents the temperature detected by the second temperature sensor 13.
When the heat exchange temperature difference delta t is smaller than or equal to the superheat degree set value C, it is indicated that the surface of the evaporator 5 is frosted and defrosting is required, after the mainboard controller receives signals sent by the second temperature sensor 13 and the third temperature sensor 14, the mainboard controller controls the first valve 8, the second valve 9 and the third valve 10 to be opened simultaneously, a part of high-temperature and high-pressure gas output by the air outlet of the oil separator 2 is automatically decompressed into the decompression tank 7, and then is introduced into the evaporator 5 to automatically melt the frost layer on the surface of the evaporator 5, so that the purpose of automatic hot gas defrosting is achieved, and the other part of refrigerant output by the air outlet of the oil separator 2 continues refrigerating operation through the refrigerating circulation loop. When the heat exchange temperature difference delta t is larger than the superheat degree set value C, it is indicated that the surface of the evaporator 5 is frostless and defrosting is not needed, at the moment, the main board controller sends out an instruction signal to control the first valve 8, the second valve 9 and the third valve 10 to be closed at the same time, and all refrigerants output by the air outlet of the oil separator 2 are refrigerated through the refrigeration cycle loop.
The above-mentioned specified parameters may include: the air quantity of the fan corresponding to the evaporator 5. Accordingly, controlling the first valve 8, the second valve 9 and the third valve 10 according to the specified parameters to defrost the evaporator comprises: when the rotating speed of the fan is unchanged and the air volume is reduced, a first valve 8, a second valve 9 and a third valve 10 are opened; when the fan speed is unchanged and the air volume is not reduced, the first valve 8, the second valve 9 and the third valve 10 are closed.
On the premise that the rotating speed of the fan is not changed, when the fan air volume detected by the air volume sensor 15 is reduced, it is indicated that the surface of the evaporator 5 is frosted seriously, the air circulation on the surface of the evaporator is affected, and defrosting is needed, after the mainboard controller receives a signal sent by the air volume sensor 15, the first valve 8, the second valve 9 and the third valve 10 are controlled to be opened simultaneously, a part of high-temperature and high-pressure gas output by the air outlet of the oil separator 2 is automatically decompressed into the decompression tank 7, and then is introduced into the evaporator 5 to automatically melt the frost layer on the surface of the evaporator 5, so that the purpose of automatic hot gas defrosting is achieved, and the other part of refrigerant output by the air outlet of the oil separator 2 continues refrigerating operation through the refrigerating circulation loop. When the fan air volume detected by the air volume sensor 15 is not reduced, it indicates that the surface of the evaporator 5 is frostless, at this time, the main board controller sends out a command signal to control the first valve 8, the second valve 9 and the third valve 10 to be closed at the same time, and all the refrigerants output from the air outlet of the oil separator 2 are refrigerated through the refrigeration cycle loop.
According to the intelligent temperature and pressure control defrosting control scheme, the mainboard controller automatically senses the designated parameters through the sensor, and automatically opens or closes the corresponding valve according to the designated parameters to control whether to release pressure and/or whether to defrost hot air.
EXAMPLE III
Based on the same inventive concept, the present embodiment provides a unit control device, which is applied to the refrigeration unit described in the above embodiment and can be used to implement the unit control method described in the above embodiment. The device may be implemented by software and/or hardware, and may be generally integrated into a controller of the unit.
Fig. 3 is a block diagram of a structure of a unit control device according to a third embodiment of the present invention, and as shown in fig. 3, the device includes:
the detection module 31 is used for detecting the designated parameters of the refrigerating unit;
and the control module 32 is used for controlling the refrigerating unit to release pressure and/or defrost the evaporator according to the designated parameters.
Optionally, the control module 32 is specifically configured to: controlling the first valve, the second valve and the third valve according to the designated parameters to release pressure and/or defrost the evaporator;
the first valve is arranged on a connecting pipeline between the first end of the pressure relief tank and an air outlet of the oil separator; the second valve is arranged on a connecting pipeline between the second end of the pressure relief tank and the first end of the defrosting pipeline; and the third valve is arranged on a connecting pipeline between the second end of the defrosting pipeline and the air suction port of the compressor.
Optionally, the specifying parameters include: exhaust temperature and/or exhaust pressure. The control module 32 includes: the first control unit is used for opening the first valve and controlling the second valve and the third valve according to a preset rule when the exhaust temperature is greater than an exhaust temperature set value and/or the exhaust pressure is greater than an exhaust pressure set value; and closing the first valve, the second valve and the third valve when the exhaust temperature is less than or equal to an exhaust temperature set value and/or the exhaust pressure is less than or equal to an exhaust pressure set value.
Optionally, the first control unit is specifically configured to: when the exhaust temperature is greater than an exhaust temperature set value and/or the exhaust pressure is greater than an exhaust pressure set value, opening the second valve and the third valve; or, the second valve and the third valve are controlled according to whether defrosting is needed.
Optionally, the specifying parameters include: the heat exchange temperature difference of the evaporator. The control module 32 includes: the second control unit is used for opening the first valve, the second valve and the third valve when the heat exchange temperature difference is smaller than or equal to a superheat degree set value; and closing the first valve, the second valve and the third valve when the heat exchange temperature difference is larger than a superheat degree set value.
Optionally, the specified parameters include: the air quantity of a fan corresponding to the evaporator. The control module 32 includes: the third control unit is used for opening the first valve, the second valve and the third valve when the rotating speed of the fan is unchanged and the air volume is reduced; and when the rotating speed of the fan is unchanged and the air volume is not reduced, closing the first valve, the second valve and the third valve.
The unit control device can execute the unit control method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For details of the technology that are not described in detail in this embodiment, reference may be made to the unit control method provided in the embodiment of the present invention.
Example four
The present embodiment provides a computer device, including: memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of the above embodiments when executing the computer program.
EXAMPLE five
The present embodiment provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of the above-described embodiment.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. The utility model provides a refrigerating unit, is including the compressor, oil separator, condenser, throttling element and the evaporimeter that connect gradually, its characterized in that, the inside of evaporimeter is provided with defrosting pipeline and refrigeration pipeline, refrigerating unit still includes:
the first end of the pressure relief tank is connected to the air outlet of the oil separator, and the second end of the pressure relief tank is connected to the first end of the defrosting pipeline;
the second end of the defrosting pipeline is connected to the air suction port of the compressor.
2. The refrigeration unit as set forth in claim 1 wherein a first valve is disposed in a connection line between the first end of the pressure relief tank and the air outlet of the oil separator;
and a second valve is arranged on a connecting pipeline between the second end of the pressure relief tank and the first end of the defrosting pipeline.
3. The refrigeration unit as set forth in claim 1 wherein a third valve is disposed on a connection line between the second end of the defrost line and the suction port of the compressor.
4. The refrigeration unit as set forth in claim 1 further comprising:
the pressure sensor is arranged on a connecting pipeline between an air outlet of the oil separator and the condenser and used for detecting the exhaust pressure; and/or the presence of a gas in the gas,
and the first temperature sensor is arranged on a pipeline connected with an exhaust port of the compressor and used for detecting the exhaust temperature.
5. The refrigeration unit as set forth in any one of claims 1 to 4 further comprising:
the second temperature sensor is arranged at the inlet of the refrigeration pipeline and used for detecting the temperature of an inlet refrigerant of the refrigeration pipeline;
and the third temperature sensor is arranged at the outlet of the refrigeration pipeline and used for detecting the temperature of the outlet refrigerant of the refrigeration pipeline.
6. The refrigeration unit as set forth in any one of claims 1 to 5 further comprising:
and the air quantity sensor is used for detecting the air quantity of the fan corresponding to the evaporator.
7. A unit control method applied to a refrigeration unit according to any one of claims 1 to 6, the method comprising:
detecting specified parameters of the refrigerating unit;
and controlling the refrigerating unit to release pressure and/or defrost an evaporator according to the designated parameters.
8. The method of claim 7, wherein controlling the refrigeration unit to vent and/or defrost an evaporator based on the specified parameter comprises:
controlling the first valve, the second valve and the third valve according to the designated parameters to release pressure and/or defrost an evaporator;
the first valve is arranged on a connecting pipeline between the first end of the pressure relief tank and an air outlet of the oil separator; the second valve is arranged on a connecting pipeline between the second end of the pressure relief tank and the first end of the defrosting pipeline; and the third valve is arranged on a connecting pipeline between the second end of the defrosting pipeline and the air suction port of the compressor.
9. The method of claim 8, wherein the specifying parameters comprises: exhaust temperature and/or exhaust pressure;
controlling a first valve, a second valve and a third valve according to the specified parameters to carry out pressure relief, comprising:
when the exhaust temperature is greater than an exhaust temperature set value and/or the exhaust pressure is greater than an exhaust pressure set value, opening the first valve, and controlling the second valve and the third valve according to a preset rule;
closing the first valve, the second valve, and the third valve when the exhaust temperature is less than or equal to an exhaust temperature set value, and/or the exhaust pressure is less than or equal to an exhaust pressure set value.
10. The method of claim 9, wherein controlling the second valve and the third valve according to a preset rule comprises:
opening the second valve and the third valve; or,
controlling the second valve and the third valve according to whether defrosting is needed.
11. The method according to any one of claims 8 to 10, wherein the specifying parameters comprises: heat exchange temperature difference of the evaporator;
controlling a first valve, a second valve and a third valve according to the designated parameters to defrost an evaporator, comprising:
when the heat exchange temperature difference is less than or equal to a superheat degree set value, opening the first valve, the second valve and the third valve;
and when the heat exchange temperature difference is larger than a superheat degree set value, closing the first valve, the second valve and the third valve.
12. The method according to any one of claims 8 to 10, wherein the specifying parameters comprises: the air quantity of a fan corresponding to the evaporator;
controlling a first valve, a second valve and a third valve according to the designated parameters to defrost an evaporator, comprising:
when the rotating speed of the fan is unchanged and the air volume is reduced, the first valve, the second valve and the third valve are opened;
and when the rotating speed of the fan is unchanged and the air volume is not reduced, closing the first valve, the second valve and the third valve.
13. A unit control device, to be applied to a refrigeration unit as claimed in any one of claims 1 to 6, the device comprising:
the detection module is used for detecting the designated parameters of the refrigerating unit;
and the control module is used for controlling the refrigerating unit to release pressure and/or defrost the evaporator according to the specified parameters.
14. A non-transitory computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, performs the steps of the method according to any one of claims 7 to 12.
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| CN202211055713.9A CN115289730A (en) | 2022-08-31 | 2022-08-31 | Refrigerating unit, unit control method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211055713.9A CN115289730A (en) | 2022-08-31 | 2022-08-31 | Refrigerating unit, unit control method and device |
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| JP2004340534A (en) * | 2003-05-19 | 2004-12-02 | Matsushita Electric Ind Co Ltd | Heat pump device |
| CN204115322U (en) * | 2014-03-24 | 2015-01-21 | 浙江商业职业技术学院 | Hot fluorine defrosting device |
| CN105202812A (en) * | 2015-09-17 | 2015-12-30 | 广西汽车集团有限公司 | Refrigerator car and heating unit thereof |
| CN205102459U (en) * | 2015-09-17 | 2016-03-23 | 广西汽车集团有限公司 | Refrigerator car and unit heats thereof |
| CN218120283U (en) * | 2022-08-31 | 2022-12-23 | 珠海格力电器股份有限公司 | Refrigerating unit |
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2022
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004340534A (en) * | 2003-05-19 | 2004-12-02 | Matsushita Electric Ind Co Ltd | Heat pump device |
| CN204115322U (en) * | 2014-03-24 | 2015-01-21 | 浙江商业职业技术学院 | Hot fluorine defrosting device |
| CN105202812A (en) * | 2015-09-17 | 2015-12-30 | 广西汽车集团有限公司 | Refrigerator car and heating unit thereof |
| CN205102459U (en) * | 2015-09-17 | 2016-03-23 | 广西汽车集团有限公司 | Refrigerator car and unit heats thereof |
| CN218120283U (en) * | 2022-08-31 | 2022-12-23 | 珠海格力电器股份有限公司 | Refrigerating unit |
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