CN117469829B - Self-cascade refrigeration system and control method - Google Patents
Self-cascade refrigeration system and control method Download PDFInfo
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- CN117469829B CN117469829B CN202311822314.5A CN202311822314A CN117469829B CN 117469829 B CN117469829 B CN 117469829B CN 202311822314 A CN202311822314 A CN 202311822314A CN 117469829 B CN117469829 B CN 117469829B
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 144
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012544 monitoring process Methods 0.000 claims abstract description 52
- 230000017525 heat dissipation Effects 0.000 claims abstract description 42
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007667 floating Methods 0.000 description 12
- 239000003507 refrigerant Substances 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 8
- 238000009833 condensation Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003993 interaction 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
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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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
- F25B41/26—Disposition of valves, e.g. of on-off valves or flow control valves of fluid flow reversing valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The application relates to a self-cascade refrigeration system and a control method, wherein the system comprises: the heat dissipation module is arranged in the self-cascade refrigeration system and used for dissipating heat of a condenser in the self-cascade refrigeration system and comprises a first fan and a second fan; the temperature monitoring module is arranged in the self-cascade refrigeration system and is used for detecting the real-time temperature of the self-cascade refrigeration system; the control module is used for determining the working state of the self-cascade refrigeration system according to the temperature information acquired by the temperature monitoring module, and controlling the heat dissipation module according to the working state of the self-cascade refrigeration system so as to improve the heat dissipation efficiency of the self-cascade refrigeration system by controlling the rotating speeds of the first fan and the second fan when the working state of the self-cascade refrigeration system is a high-load working state. Through the technical scheme provided by the application, the heat dissipation effect of the self-cascade refrigeration system in the high-load working state is improved, and the operation reliability of the self-cascade refrigeration system is improved.
Description
Technical Field
The application relates to the field of refrigeration systems, in particular to a self-cascade refrigeration system and a control method.
Background
The self-cascade refrigeration technology utilizes the phase change of cascade materials to realize refrigeration, the cascade materials are composite materials composed of multiple layers of different materials, each layer of material has different phase change temperatures, when the external temperature is higher than the lowest phase change temperature in the cascade materials, the cascade materials release latent heat layer by layer, and the environmental heat is absorbed, so that the refrigeration effect is realized.
At present, a double-system and single-fan scheme is adopted in a self-cascade refrigeration system, and fans act on a condenser in the self-cascade refrigeration system to dissipate heat of the self-cascade refrigeration system.
However, when the self-cascade refrigeration system is in a high-load working state, the control of the condensation temperature of the condenser is difficult to ensure, and the self-cascade refrigeration system adopting the single fan has poor operation reliability.
Disclosure of Invention
The application provides a self-cascade refrigeration system and a control method thereof, so as to improve the heat dissipation effect of the self-cascade refrigeration system on a condenser in a high-load working state and improve the operation reliability of the self-cascade refrigeration system.
In a first aspect, the present application provides a self-cascade refrigeration system comprising:
the heat dissipation module is arranged in the self-cascade refrigeration system and used for dissipating heat of a condenser in the self-cascade refrigeration system, and comprises a first fan and a second fan, wherein the first fan and the second fan are positioned on the same side of the condenser, and the air outlet directions of the first fan and the second fan face the same side of the condenser; the heat dissipation module further comprises a fan cover, the fan cover surrounds the first fan and the second fan, openings are formed in two ends of the fan cover, one end opening of the fan cover is connected with the condenser, and the air outlet direction of the first fan and the air outlet direction of the second fan face to the opening of one end, connected with the condenser, of the fan cover;
the temperature monitoring module is arranged in the self-cascade refrigeration system and is used for detecting the real-time temperature of the self-cascade refrigeration system;
the control module is respectively connected with the heat radiation module and the temperature monitoring module and is used for determining the working state of the self-cascade refrigeration system according to the temperature information acquired by the temperature monitoring module and controlling the heat radiation module according to the working state of the self-cascade refrigeration system so as to improve the heat radiation efficiency of the self-cascade refrigeration system by controlling the rotating speeds of the first fan and the second fan when the working state of the self-cascade refrigeration system is a high-load working state.
In a second aspect, the present application provides a control method for the self-cascade refrigeration system described in the first aspect, the method including:
acquiring a first working temperature acquired by a first temperature monitoring unit, wherein the first working temperature is the temperature in a box of a space where the self-cascade refrigeration system is located;
under the condition that the first working temperature is in a first temperature interval, determining the working state of the self-cascade refrigeration system as a high-load working state;
under the condition that the working state of the self-cascade refrigeration system is determined to be a high-load working state, a first fan and a second fan are started, and the running rotational speed of the first fan and the second fan is regulated to a first running rotational speed;
determining the working state of the self-cascade refrigeration system as a low-load working state under the condition that the first working temperature is in a second temperature interval;
under the condition that the working state of the self-cascade refrigeration system is determined to be a low-load working state, acquiring a second working temperature acquired by a second temperature monitoring unit, wherein the second working temperature is the temperature of a condenser in the self-cascade refrigeration system;
and under the condition that the second working temperature is greater than a temperature threshold value, starting the first fan and the second fan, and regulating the running rotational speeds of the first fan and the second fan to the first running rotational speed.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: according to the method provided by the embodiment of the application, the double fans are arranged on one side of the condenser, and the first fan and the second fan act on the condenser at the same time to radiate heat of the condenser; when the self-cascade refrigeration system is in a high-load working state, the rotating speeds of the first fan and the second fan are controlled, so that the heat dissipation of the condenser is accelerated, the heat dissipation efficiency of the self-cascade refrigeration system in the high-load working state is effectively ensured, and the running stability of the self-cascade refrigeration system is improved; meanwhile, only when the first fan and the second fan are in failure, the self-cascade refrigeration system cannot work normally due to failure of the heat dissipation module, and the running stability of the self-cascade refrigeration system is further guaranteed due to the arrangement of the double fans.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is an overall connection schematic diagram of a self-cascade refrigeration system according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a self-cascade refrigeration system according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a heat dissipation module in a self-cascade refrigeration system according to an embodiment of the present application.
Fig. 4 is a flow chart of a control method for a self-cascade refrigeration system according to an embodiment of the present application.
Fig. 5 is a schematic diagram of a temperature interval in a control method for a self-cascade refrigeration system according to an embodiment of the present application.
Fig. 6 is a flow chart of a control method for a self-cascade refrigeration system according to another embodiment of the present application.
Fig. 7 is a schematic flow chart of a self-cascade refrigeration system according to another embodiment of the present application.
Description of the drawings: 1. a self-cascade refrigeration system; 11. a heat dissipation module; 12. a control module; 13. a temperature monitoring module; 111. a first fan; 112. a second fan, 113, a fan housing; 114. a non-return shutter; 2. a condenser; 31. a heat regenerator A; 41. an evaporator A; 51. a compressor A; 61. an intermediate heat exchanger A; 71. a gas-liquid separator A; 81. drying the filter A; 32. a heat regenerator B; 42. an evaporator B; 52. a compressor B; 62. an intermediate heat exchanger B; 72. a gas-liquid separator B; 82. and drying the filter B.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
In order to solve the technical problems that in the prior art, when the self-cascade refrigeration system 1 is in a high-load working state, the condensation load of the condenser 2 is high, the condensation temperature is difficult to control, and the operation reliability of the self-cascade refrigeration system 1 is low, the application provides the self-cascade refrigeration system 1 so as to improve the operation reliability of the self-cascade refrigeration system 1.
For a clear description of the technical solution provided in the present application, first, the overall structure of the self-cascade refrigeration system 1 provided in the present application will be described.
Referring to fig. 1, a self-cascade refrigeration system 1 provided by the application includes a first refrigeration circuit and a second refrigeration circuit, the first refrigeration circuit and the second refrigeration circuit operate independently, a condenser 2 of the first refrigeration circuit and a condenser 2 of the second refrigeration circuit are integrated in the same device, condensation flow paths of the two circuits are mutually intersected, and condensation pipes are evenly distributed on two sides of a windward side and a leeward side of the condenser 2, so that condensation heat exchange of the two circuits can be guaranteed to be the same.
In any one of the first refrigeration loop and the second refrigeration loop, the refrigerant flows in the loop, the liquid low-temperature low-pressure refrigerant absorbs heat of the external environment when passing through the evaporator, the heat is evaporated into gas under the action of the evaporator, the gaseous refrigerant passes through the heat regenerator and the intermediate heat exchanger in the loop and then flows to the compressor, the gaseous refrigerant is compressed into the gaseous high-temperature high-pressure refrigerant under the action of the compressor and flows to the condenser 2, the condenser 2 dissipates heat through a fan, the temperature of the refrigerant is reduced, the heat is discharged out of the system, the refrigerant passing through the condenser 2 is the liquid high-temperature high-pressure refrigerant, and the liquid low-temperature low-pressure refrigerant is converted after being throttled by the throttling equipment, so that the circulation in the loop is completed.
Fig. 2 is a schematic structural diagram of a self-cascade refrigeration system 1 provided in an embodiment of the present application, as shown in fig. 2, the self-cascade refrigeration system 1 provided in an embodiment of the present application includes:
the heat dissipation module 11 is arranged in the self-cascade refrigeration system 1 and is used for dissipating heat of the self-cascade refrigeration system 1, the heat dissipation module 11 comprises a first fan 111 and a second fan 112, the first fan 111 and the second fan 112 are positioned on the same side of the condenser 2, and the air outlet direction of the first fan 111 and the air outlet direction of the second fan 112 face the same side of the condenser 2;
the temperature monitoring module 13 is arranged in the self-cascade refrigerating system 1 and is used for detecting the real-time temperature of the self-cascade refrigerating system 1;
the control module 12, the control module 12 is connected with the heat dissipation module 11 and the temperature monitoring module 13 respectively, and is used for determining the working state of the self-cascade refrigeration system 1 according to the temperature information collected by the temperature monitoring module 13, and controlling the heat dissipation module 11 according to the working state of the self-cascade refrigeration system 1, so that when the working state of the self-cascade refrigeration system 1 is a high-load working state, the heat dissipation efficiency of the self-cascade refrigeration system 1 is improved by controlling the rotation speeds of the first fan 111 and the second fan 112.
Specifically, referring to fig. 1 and 2, the heat dissipation module 11 is disposed in the self-cascade refrigeration system 1, and is specifically located at one side of the condenser 2 in the self-cascade refrigeration system 1. The heat dissipation module 11 includes a first fan 111 and a second fan 112, where the first fan 111 and the second fan 112 are located on the same side of the condenser 2, and the air outlet directions of the first fan 111 and the second fan 112 are both towards the same side of the condenser 2, and the first fan 111 and the second fan 112 supply air to the condenser 2 to discharge heat on the condenser 2 out of the system.
The first fan 111 and the second fan 112 are powered by two independent power supplies, and the first fan 111 and the second fan 112 can respectively and independently operate or simultaneously start to operate together. In a possible embodiment of the present application, the first fan 111 and the second fan 112 may be axial fans, and the airflow characteristics of the axial fans are that the peripheral air volume is large and the central air volume is small, so that for the first fan 111 and the second fan 112 placed side by side, the central air volume is increased by the interaction of the two air flows of the two fans, and the air supply volume to the condenser 2 is effectively improved.
The first fan 111 and the second fan 112 are controlled by the control module 12, and the operation speed adjustment can be continued based on the control instruction of the control module 12, in a feasible embodiment of the present application, the first fan 111 and the second fan 112 are set to 4 operation speed steps, which are respectively a shutdown step, a low speed step, a middle speed step and a high speed step, and the operation speeds of the fans in the steps from the shutdown step to the high speed step are sequentially increased.
The temperature monitoring module 13 may be a temperature sensor, where the temperature monitoring module 13 is disposed in the self-cascade refrigeration system 1, collects temperature information in the self-cascade refrigeration system 1 in real time, and feeds back the temperature information to the control module 12 in real time.
The control module 12 is connected to the heat dissipation module 11 and the temperature monitoring module 13, and is configured to receive, process, and send information, where the control module 12 is capable of receiving temperature information in the self-cascade refrigeration system 1 collected by the temperature monitoring module 13, processing the temperature information, and controlling the heat dissipation module 11 based on the processed result.
Referring to fig. 3, in one possible embodiment of the present application, the heat dissipation module 11 further includes a fan housing 113, the fan housing 113 surrounds the first fan 111 and the second fan 112, two ends of the fan housing 113 have openings, one end opening of the fan housing 113 is connected to the condenser 2, and the air outlet directions of the first fan 111 and the second fan 112 face to one end opening of the fan housing 113 connected to the condenser 2.
Specifically, the fan housing 113 is configured to gather air volumes of the first fan 111 and the second fan 112, on one hand, under the action of the fan housing 113, the air flows of the first fan 111 and the second fan 112 interact, so that the central air volume blown to the condenser 2 is increased; on the other hand, the fan housing 113 ensures the uniformity of the wind fields of the first fan 111 and the second fan 112, which is beneficial to ensuring the uniformity of heat dissipation of the condenser 2.
In one possible embodiment of the present application, the heat dissipation module 11 further includes a non-return shutter 114, where the non-return shutter 114 is connected to the other end opening of the fan housing 113, and the air inlet directions of the first fan 111 and the second fan 112 face the non-return shutter 114.
Specifically, the non-return shutter 114 is composed of an arrangement of a plurality of vanes, specifically similar to a shutter. By arranging the non-return louver 114 at the air inlets of the first fan 111 and the second fan 112, the reverse flow of the wind conveyed by the first fan 111 and the second fan 112 along the reverse direction of the condenser 2 is prevented, and the heat dissipation efficiency of the condenser 2 is further improved; meanwhile, when the single fan is started, the non-return shutter 114 can also prevent the air duct of the single fan from being shorted, in one possible embodiment of the present application, the temperature monitoring module 13 specifically includes a first temperature monitoring unit and a second temperature monitoring unit, where:
the first temperature monitoring unit is used for monitoring the temperature in the box of the space where the cascade refrigeration system is located;
and the second temperature monitoring unit is connected with the condenser 2 in the self-cascade refrigeration system 1 and is used for monitoring the real-time temperature of the condenser 2.
In one possible embodiment of the present application, a self-cascade refrigeration system 1 further includes an operation monitoring module, where the operation monitoring module is connected to the controller and is configured to detect an operation state of the first fan 111 and the second fan 112, and send the operation state to the control module 12 in real time.
Specifically, the operation monitoring module can monitor the operation states of the first fan 111 and the second fan 112, and is connected to the control module 12, and can send the operation states of the first fan 111 and the second fan 112 to the control module 12. The operation monitoring module may monitor the operation states of the first fan 111 and the second fan 112 by monitoring the rotation speeds of the first fan 111 and the second fan 112, and of course, the operation monitoring module may monitor the operation states of the first fan 111 and the second fan 112 by detecting other operation parameters of the first fan 111 and the second fan 112, such as output current, output voltage, and the like.
In one possible embodiment of the present application, the operation monitoring module is capable of monitoring abnormal states of the first fan 111 and the second fan 112, and when the operation states of the first fan 111 and the second fan 112 are the start states, if the operation rotational speeds of the first fan 111 and the second fan 112 are 0, it is possible to identify that the first fan 111 and the second fan 112 are in the abnormal states.
According to the technical scheme provided by the application, in the self-cascade refrigeration system 1, the detection of the high-load state of the self-cascade refrigeration system 1 is completed through the mutual matching of the heat dissipation module 11, the control module 12 and the temperature monitoring module 13; when the self-cascade refrigeration system 1 is in a high-load state, the heat dissipation efficiency of the heat dissipation module 11 is improved by controlling the rotation speeds of the first fan 111 and the second fan 112, meanwhile, the strength and uniformity of wind conveyed to the condenser 2 are further improved by the arrangement of the wind shield 113 and the non-return shutter 114 in the heat dissipation module 11, the heat dissipation efficiency of the self-cascade refrigeration system 1 is further improved, the self-cascade refrigeration system 1 can still normally operate in the high-load state, and the operation stability of the self-cascade refrigeration system 1 is improved.
Fig. 4 is a flow chart of a control method for the self-cascade refrigeration system 1 according to the embodiment, as shown in fig. 4, where the control method for the self-cascade refrigeration system 1 according to the embodiment of the present application includes:
s1: acquiring a first working temperature acquired by a first temperature monitoring unit, wherein the first working temperature is the temperature in a box of a space where the self-cascade refrigeration system 1 is positioned;
specifically, the first temperature monitoring unit in the temperature monitoring module 13 collects a first working temperature, which is the temperature in the self-cascade refrigeration system 1, and reflects the overall operation temperature of the self-cascade refrigeration system 1, and is an important dimension determined by the working state of the self-cascade refrigeration system 1.
S2: determining the working state of the self-cascade refrigeration system 1 as a high-load working state under the condition that the first working temperature is in a first temperature interval;
specifically, the temperature interval of the first working temperature is determined according to a preset temperature interval determining rule. The temperature interval determination rule defines a plurality of temperature intervals, and in one possible embodiment of the present application, the temperature interval determination rule is formulated based on a preset reference temperature.
Referring to fig. 5, in one possible embodiment of the present application, the reference temperature is preset to be T1, the startup floating temperature is preset to be T2, the operation floating temperature is preset to be T3, and the shutdown floating temperature is preset to be T4. It can be understood that the preset start-up floating temperature reflects the ideal temperature rising degree of the self-cascade refrigeration system 1 during initial start-up, the preset running floating temperature reflects the ideal temperature rising degree of the self-cascade refrigeration system 1 during running, and the preset shutdown floating temperature reflects the ideal temperature falling degree of the self-cascade refrigeration system 1 during shutdown, and all the temperatures are measured by technicians through experiments.
When the current first working temperature is greater than the preset reference temperature T1 plus the preset operation floating temperature T3, the first working temperature is located in a first temperature interval. When the first working temperature is in the first temperature range, the working state of the self-cascade refrigeration system 1 is considered to be a high-load working state.
S3: under the condition that the working state of the self-cascade refrigeration system 1 is determined to be a high-load working state, starting the first fan 111 and the second fan 112, and regulating the operation rotation speeds of the first fan 111 and the second fan 112 to a first operation rotation speed;
specifically, when the self-cascade refrigeration system 1 is in a high-load working state, the system operating pressure is high, the heat dissipation pressure of the condenser 2 is high, at this time, the control module 12 controls the first fan 111 and the second fan 112 in the heat dissipation module 11 to start, and the operation rotation speed of the first fan 111 and the second fan 112 is adjusted to the first operation rotation speed. The first operation rotation speed may be a middle speed of the first fan 111 and the second fan 112, and since the self-cascade refrigeration system 1 is in a high-load working state, but still in a control range of two fans, the first operation rotation speed is set as the middle speed of the first fan 111 and the second fan 112.
In a possible embodiment of the present application, a control method for a self-cascade refrigeration system 1 further includes:
determining the working state of the self-cascade refrigeration system 1 as a low-load working state under the condition that the first working temperature is in a second temperature interval;
under the condition that the working state of the self-cascade refrigeration system 1 is determined to be a low-load working state, acquiring a second working temperature acquired by a second temperature monitoring unit, wherein the second working temperature is the temperature of a condenser 2 in the self-cascade refrigeration system 1;
and under the condition that the second working temperature is greater than the temperature threshold value, starting the first fan 111 and the second fan 112, and regulating the operation rotation speed of the first fan 111 and the second fan 112 to the first operation rotation speed.
Specifically, the second temperature interval is specifically that the first working temperature is greater than the reference temperature t1+ and the preset startup floating temperature is T2 and less than the reference temperature t1+ and the preset operation floating temperature T3, and when the first working temperature is in the second temperature interval, the operation pressure of the self-cascade refrigeration system 1 can be considered to be smaller, and the self-cascade refrigeration system is in a low-load working state.
In order to realize more accurate control of the condensation temperature of the condenser 2, when the self-cascade refrigeration system 1 is in a low-load working state, the second working temperature acquired by the second temperature monitoring unit, namely the real-time temperature of the condenser 2, is acquired, and the operation of the first fan 111 and the second fan 112 is controlled according to the second working temperature.
Comparing the second working temperature with a preset temperature threshold, and under the condition that the second working temperature is larger than the temperature threshold, starting the first fan 111 and the second fan 112, and rotating the operation of the first fan 111 and the second fan 112 to the first operation rotation speed so as to ensure the heat dissipation effect of the condenser 2.
Under the condition that the second working temperature is smaller than the temperature threshold value, starting the first fan 111 and the second fan 112, and regulating the operation rotation speed of the first fan 111 and the second fan 112 to a second operation rotation speed; wherein, the second operation rotation speed is smaller than the first operation rotation speed, that is, the operation rotation speeds of the first fan 111 and the second fan 112 are adjusted down, so that the energy consumption is reduced. The second operating speed may be set to a low speed gear of the first fan 111 and the second fan 112.
In one possible embodiment of the present application, in order to still ensure the heat dissipation efficiency of the self-cascade refrigeration system 1 when the fans are abnormally operated, after the first fan 111 and the second fan 112 are started, the method further includes:
detecting the operation states of the first fan 111 and the second fan 112 through an operation monitoring module;
in the case where the operation state of the first fan 111 is an abnormal state, the operation rotational speed of the second fan 112 is adjusted to the third operation rotational speed; wherein the third operating speed is greater than the first operating speed;
in the case where the operation state of the second fan 112 is an abnormal state, the operation rotational speed of the first fan 111 is adjusted to the third operation rotational speed.
Specifically, after the starting process of the first fan 111 and the second fan 112 in the foregoing embodiment, the first fan 111 and the second fan 112 operate according to the corresponding rotational speeds, when the first fan 111 and the second fan 112 operate, the fans may fail due to external reasons, so as to avoid the influence on heat dissipation caused by the shutdown of the fans due to the failure of the fans, monitor the operation state of the fans in real time, and when any fan fails, adjust the operation rotational speed of the other fan to the third operation rotational speed in time, so as to maintain the current heat dissipation.
The third operating speed is the highest speed of the fans, and in one possible embodiment of the present application, the third operating speed is a high speed gear of the first fan 111 and the second fan 112. Meanwhile, when detecting that a fan breaks down, the operation monitoring module feeds back fault information to the control module 12, so that the control module 12 alarms to related personnel after receiving the fault information, and prompts the related personnel to process the fault as soon as possible.
Through the embodiment, compared with the existing double-system and single-fan self-cascade refrigeration system 1, the self-cascade refrigeration system 1 can still ensure the refrigeration efficiency of the system when any fan fails, and further improves the operation stability of the self-cascade refrigeration system 1.
Through the technical scheme provided by the application, the working state of the self-cascade refrigeration system 1 is determined based on the first working temperature of the temperature in the box of the space where the indication system is located, when the self-cascade refrigeration system 1 is in a high-load working state, the first fan 111 and the second fan 112 are started, and are enabled to run at a faster first rotation speed, so that the heat dissipation requirement of the high-load working state is met.
Referring to fig. 6, in a possible embodiment of the present application, the first working temperature may also be in a third temperature interval, where the third temperature interval is specifically that the first working temperature is greater than the reference temperature T1, the preset shutdown floating temperature is T4, and is less than the reference temperature t1+the preset startup floating temperature T2.
When the first operating temperature is in the third temperature interval, the current operating states of the first fan 111 and the second fan 112 are maintained, for example, the first operating temperatures of the first fan 111 and the second fan 112 when the first fan 111 and the second fan 112 are initially started are in the first temperature interval, the operating speeds of the first fan 111 and the second fan 112 are the first operating speeds, and in the subsequent operating process, the first operating temperatures are detected to be in the third temperature interval, and at this time, the operating speeds of the first fan 111 and the second fan 112 are maintained to be the first operating speeds.
In this embodiment, to ensure the heat dissipation efficiency of the system, when the first working temperature is in the second temperature interval, that is, when the system is in the low-load working state, whether the first fan 111 and the second fan 112 are operated at the second operation rotation speed is determined, if so, the operation rotation speeds of the first fan 111 and the second fan 112 are kept at the second operation rotation speed, if not, the comparison of the second working temperature with the preset temperature threshold is started, and the subsequent steps are executed.
Referring to fig. 7, in one possible embodiment of the present application, control of the first fan 111 and the second fan 112 is associated with control of the compressors in the self-cascade refrigeration system 1.
The compressors in the self-cascade refrigeration system 1 comprise a first compressor and a second compressor, wherein the first compressor is a compressor in the first refrigeration loop, and the second compressor is a compressor in the second refrigeration loop.
The method for controlling the first compressor and the second compressor is determined according to the temperature interval of the first working temperature, specifically, the method for controlling the first compressor and the second compressor comprises the following steps:
when the first working temperature is in a first temperature interval, the first compressor and the second compressor are started at the same time so as to lighten the refrigerating pressure of the system;
when the first working temperature is in the second temperature interval, determining the current starting states of the first compressor and the second compressor; when the first compressor is started, the starting of the first compressor is maintained, and the second compressor is not started; when the second compressor is started, the second compressor is maintained to be started, and the first compressor is not started; under the condition that the first compressor and the second compressor are not started, starting one compressor with less accumulated operation time length; under the condition that the first compressor and the second compressor are started, closing one compressor with more accumulated operation time length;
and when the first working temperature is in the third temperature interval, the existing starting state of the compressor is maintained.
Through the above embodiment, the association control of the first compressor and the second compressor is completed based on the temperature in the box of the space where the cascade refrigeration system 1 is located, when the system is operated in a high-load working state, the first compressor and the second compressor are simultaneously started to reduce the refrigeration pressure of the system, and when the system is operated in a low-load working state, one compressor with a shorter accumulated operation time length is started to ensure the working life of the compressors.
In one possible embodiment of the present application, the first fan 111 and the second fan 112 are started before the first compressor and the second compressor, and are turned off later than the first compressor and the second compressor, so as to sufficiently dissipate heat from the condenser 2.
In one possible embodiment of the present application, in the event that the first compressor and the second compressor need to be started simultaneously, after a preset time of start of one compressor, the other compressor is started.
In one possible embodiment of the present application, the temperature interval further includes a fourth temperature interval, and when the first operating temperature is in the fourth temperature interval, the first fan 111 and the second fan 112 are turned off, and the first compressor and the second compressor are turned off. The fourth temperature interval is specifically that the first working temperature is smaller than the reference temperature T1, and the preset shutdown floating temperature is T4.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus a general purpose hardware platform, or may be implemented by hardware. Based on such understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the related art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the method described in the respective embodiments or some parts of the embodiments.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A self-cascade refrigeration system, comprising:
the heat dissipation module is arranged in the self-cascade refrigeration system and used for dissipating heat of a condenser in the self-cascade refrigeration system, and comprises a first fan and a second fan, wherein the first fan and the second fan are positioned on the same side of the condenser, and the air outlet directions of the first fan and the second fan face the same side of the condenser; the heat dissipation module further comprises a fan cover, the fan cover surrounds the first fan and the second fan, openings are formed in two ends of the fan cover, one end opening of the fan cover is connected with the condenser, and the air outlet direction of the first fan and the air outlet direction of the second fan face to the opening of one end, connected with the condenser, of the fan cover;
the temperature monitoring module is arranged in the self-cascade refrigeration system and is used for detecting the real-time temperature of the self-cascade refrigeration system;
the control module is respectively connected with the heat dissipation module and the temperature monitoring module and is used for determining the working state of the self-cascade refrigeration system according to the temperature interval of the first working temperature acquired by the temperature monitoring module; under the condition that the control module determines the working state of the self-cascade refrigeration system as a high-load working state, a first fan and a second fan are started, and the running rotational speed of the first fan and the second fan is regulated to a first running rotational speed; under the condition that the control module determines the working state of the self-cascade refrigeration system as a low-load working state, the first fan and the second fan are controlled according to the comparison result of the second working temperature and the temperature threshold value, which are acquired by the temperature monitoring module; starting the first fan and the second fan and adjusting the running speeds of the first fan and the second fan to the first running speed under the condition that the second working temperature is larger than a temperature threshold; the first working temperature is the temperature in a box of a space where the self-cascade refrigeration system is located, and the second working temperature is the temperature of a condenser in the self-cascade refrigeration system.
2. The system of claim 1, wherein the heat dissipation module further comprises a non-return louver connected to the other end opening of the fan housing, the air inlet direction of the first fan and the second fan being oriented toward the non-return louver.
3. The system of claim 1, wherein the temperature monitoring module comprises:
the first temperature monitoring unit is used for monitoring the first working temperature;
and the second temperature monitoring unit is connected with the condenser in the self-cascade refrigeration system and is used for monitoring the second working temperature.
4. The system of claim 1, wherein the system further comprises:
the operation monitoring module is connected with the control module and used for detecting the operation states of the first fan and the second fan and sending the operation states to the control module in real time.
5. A control method for a self-cascade refrigeration system as recited in any one of claims 1-4, applied to a control module, the method comprising:
acquiring a first working temperature acquired by a first temperature monitoring unit, wherein the first working temperature is the temperature in a box of a space where the self-cascade refrigeration system is located;
under the condition that the first working temperature is in a first temperature interval, determining the working state of the self-cascade refrigeration system as a high-load working state;
under the condition that the working state of the self-cascade refrigeration system is determined to be a high-load working state, a first fan and a second fan are started, and the running rotational speed of the first fan and the second fan is regulated to a first running rotational speed;
determining the working state of the self-cascade refrigeration system as a low-load working state under the condition that the first working temperature is in a second temperature interval;
under the condition that the working state of the self-cascade refrigeration system is determined to be a low-load working state, acquiring a second working temperature acquired by a second temperature monitoring unit, wherein the second working temperature is the temperature of a condenser in the self-cascade refrigeration system;
and under the condition that the second working temperature is greater than a temperature threshold value, starting the first fan and the second fan, and regulating the running rotational speeds of the first fan and the second fan to the first running rotational speed.
6. The method of claim 5, wherein after determining the operational state of the self-cascade refrigeration system as a low-load operational state, the method further comprises:
starting the first fan and the second fan and adjusting the operation rotation speeds of the first fan and the second fan to a second operation rotation speed under the condition that the second working temperature is smaller than the temperature threshold; wherein the second operating speed is less than the first operating speed.
7. The method of claim 5, wherein after activating the first fan and the second fan, the method further comprises:
detecting the running states of the first fan and the second fan through an operation monitoring module;
under the condition that the running state of the first fan is abnormal, the running rotating speed of the second fan is regulated to a third running rotating speed; wherein the third operating speed is greater than the first operating speed.
8. The method of claim 7, wherein after detecting the operating states of the first fan and the second fan by an operation monitoring module, the method further comprises:
and under the condition that the running state of the second fan is abnormal, regulating the running rotating speed of the first fan to the third running rotating speed.
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| CN206670102U (en) * | 2017-03-29 | 2017-11-24 | 太仓富华特种电机有限公司 | A kind of stepless speed changing type air cooling system for being used to cool down unit |
| CN113932467A (en) * | 2021-11-18 | 2022-01-14 | 阿尔西制冷工程技术（北京）有限公司 | Refrigeration system and control method thereof |
| CN220229403U (en) * | 2023-07-04 | 2023-12-22 | 深圳市誉佳净化设备有限公司 | Dehumidification unit with automatic cold and hot load balancing capability |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206670102U (en) * | 2017-03-29 | 2017-11-24 | 太仓富华特种电机有限公司 | A kind of stepless speed changing type air cooling system for being used to cool down unit |
| CN113932467A (en) * | 2021-11-18 | 2022-01-14 | 阿尔西制冷工程技术（北京）有限公司 | Refrigeration system and control method thereof |
| CN220229403U (en) * | 2023-07-04 | 2023-12-22 | 深圳市誉佳净化设备有限公司 | Dehumidification unit with automatic cold and hot load balancing capability |
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