CN118111063A - Fresh air machine anti-icing method and device, storage medium and fresh air dehumidifier - Google Patents

Fresh air machine anti-icing method and device, storage medium and fresh air dehumidifier Download PDF

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Publication number
CN118111063A
CN118111063A CN202211527118.0A CN202211527118A CN118111063A CN 118111063 A CN118111063 A CN 118111063A CN 202211527118 A CN202211527118 A CN 202211527118A CN 118111063 A CN118111063 A CN 118111063A
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China
Prior art keywords
fresh air
icing
temperature
compressor
external machine
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Pending
Application number
CN202211527118.0A
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Chinese (zh)
Inventor
谭秋晖
徐振坤
黄招彬
陶方方
高卓贤
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GD Midea Air Conditioning Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
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Application filed by GD Midea Air Conditioning Equipment Co Ltd filed Critical GD Midea Air Conditioning Equipment Co Ltd
Priority to CN202211527118.0A priority Critical patent/CN118111063A/en
Publication of CN118111063A publication Critical patent/CN118111063A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/1405—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a new fan anti-icing method and device, a storage medium and a new fan dehumidifier, and belongs to the technical field of new fans. According to the invention, when the fresh air machine is in operation, temperature and humidity information of the fresh air machine and the operation time of the compressor are obtained; judging the icing state of an external machine pipeline according to the temperature and humidity information of the new fan and the running time of the compressor; when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline, the running state of the new fan is adjusted, the icing state of the external machine pipeline can be judged according to the temperature and humidity information of the new fan and the running time of the compressor, and when the icing of the low-pressure pipeline of the external machine is detected, the rotating speed of the compressor in the heat pump system is adjusted, so that the air suction temperature is improved, the icing possibility of the external machine pipeline is reduced, and the user experience is improved.

Description

Fresh air machine anti-icing method and device, storage medium and fresh air dehumidifier
Technical Field
The invention relates to the technical field of fresh air fans, in particular to a fresh air fan anti-icing method and device, a storage medium and a fresh air dehumidifier.
Background
The temperature of the evaporator coil of the traditional fresh air dehumidifier is influenced by the length of a connecting pipeline, if the connecting pipeline is too long, a large pressure drop exists in the refrigerant, so that the evaporation temperature difference between the temperature of the coil and the evaporation temperature of the low-pressure pipeline of the external machine is increased, when the temperature difference between the temperature of the coil and the evaporation temperature of the low-pressure pipeline of the external machine exceeds a certain threshold value, the low-pressure pipeline of the external machine is frozen, the vibration of the pipeline of the external machine is increased, and potential safety hazards exist.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide an anti-icing method and device for a fresh air machine, a storage medium and a fresh air dehumidifier, and aims to solve the technical problem that an external machine low-pressure pipeline is frozen and potential safety hazards exist in the prior art.
In order to achieve the above purpose, the invention provides a new fan anti-icing method, which comprises the following steps:
When the fresh air machine is in refrigeration operation, temperature and humidity information of the fresh air machine and the operation time of the compressor are obtained;
Judging the icing state of an external machine pipeline according to the temperature and humidity information of the new fan and the running time of the compressor;
And when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline, adjusting the running state of the new fan.
Optionally, the judging the icing state of the external machine pipeline according to the temperature and humidity information of the fresh air fan and the operation duration of the compressor includes:
determining a dew point temperature according to the temperature and the humidity;
calculating a temperature difference between the suction temperature and the dew point temperature;
and judging the icing state of the external machine pipeline according to the suction temperature, the temperature difference value and the running time of the compressor.
Optionally, the determining the icing state of the external machine pipeline according to the suction air temperature, the temperature difference value and the operation duration of the compressor includes:
And when the air suction temperature is greater than a first preset temperature threshold, or the temperature difference is smaller than a second preset temperature threshold, or the operation duration of the compressor is smaller than a first preset time threshold, judging that the icing state of the external machine pipeline is a normal state, wherein the first preset temperature threshold is smaller than the second preset temperature threshold.
Optionally, when the icing condition of the external machine pipeline meets a preset icing protection condition of the external machine pipeline, adjusting the running state of the fresh air fan includes:
And when the suction temperature is not greater than a first preset temperature threshold value, the temperature difference is not less than a second preset temperature threshold value, and the operation duration of the compressor is not less than the first preset time threshold value, the rotating speed of the compressor is reduced.
Optionally, the new fan further includes: the throttling element is arranged in the refrigerant pipeline and used for throttling the refrigerant, and the fresh air fan is arranged in the fresh air channel of the fresh air fan and used for controlling the fresh air quantity;
when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline, the operation state of the new fan is adjusted, and the method further comprises the following steps:
when the air suction temperature is not greater than a first preset temperature threshold value, the temperature difference is not less than a second preset temperature threshold value, and the operation duration of the compressor is not less than the first preset time threshold value, the opening degree of the throttling element is increased, and/or the rotating speed of the fresh air fan is increased.
Optionally, when the icing condition of the external machine pipeline meets a preset icing protection condition of the external machine pipeline, adjusting the running state of the fresh air machine further comprises:
After a first preset time interval, acquiring the current icing state of an external machine pipeline of the new fan;
And closing the compressor when the current icing state of the external machine pipeline still meets the preset icing protection condition of the external machine pipeline.
Optionally, after the compressor is turned off, the method further includes:
Acquiring the stop operation time of the compressor;
And controlling the fresh air cooling operation when the stop operation time is not less than a second preset time threshold and the air suction temperature in the second preset time is not less than a preset temperature threshold.
In addition, in order to achieve the above purpose, the present invention further provides a new fan anti-icing device, the new fan anti-icing device includes:
the acquisition module is used for acquiring temperature and humidity information of the fresh air machine and the operation time of the compressor when the fresh air machine is in operation;
The judging module is used for judging the icing state of the external machine pipeline according to the temperature and humidity information of the fresh air machine and the running time of the compressor;
And the control module is used for adjusting the running state of the fresh air machine when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline.
In addition, in order to achieve the above object, the present invention also provides a fresh air dehumidifier, which includes: the system comprises a memory, a processor and a fresh air fan anti-icing program stored on the memory and running on the processor, wherein the fresh air fan anti-icing program is configured to realize the fresh air fan anti-icing method.
In addition, in order to achieve the above purpose, the present invention further provides a storage medium, on which a new fan anti-icing program is stored, wherein the new fan anti-icing program is executed by a processor to implement the new fan anti-icing method as described above.
According to the invention, when the fresh air machine is in operation, temperature and humidity information of the fresh air machine and the operation time of the compressor are obtained; judging the icing state of an external machine pipeline according to the temperature and humidity information of the new fan and the running time of the compressor; when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline, the running state of the new fan is adjusted, the icing state of the external machine pipeline can be judged according to the temperature and humidity information of the new fan and the running time of the compressor, and when the icing of the low-pressure pipeline of the external machine is detected, the rotating speed of the compressor in the heat pump system is adjusted, so that the air suction temperature is improved, the icing possibility of the external machine pipeline is reduced, and the user experience is improved.
Drawings
FIG. 1 is a schematic structural diagram of a fresh air dehumidifier in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of the anti-icing method of the fresh air machine of the present invention;
FIG. 3 is a schematic view of a fresh air dehumidifier according to an embodiment of the anti-icing method of the fresh air blower of the present invention;
FIG. 4 is a schematic diagram of a fresh air dehumidifier according to an embodiment of the anti-icing method of the fresh air blower of the present invention;
FIG. 5 is a schematic diagram of a first heat pump system according to an embodiment of the anti-icing method of the present invention;
FIG. 6 is a schematic diagram of a second heat pump system according to an embodiment of the anti-icing method of the present invention;
FIG. 7 is a schematic diagram of a third heat pump system according to an embodiment of the anti-icing method of the present invention;
FIG. 8 is a schematic flow chart of a second embodiment of the anti-icing method of the fresh air machine of the present invention;
fig. 9 is a block diagram of a first embodiment of the ice protection device of the new wind turbine of the present invention.
Description of the reference numerals
Reference numerals Name of the name Reference numerals Name of the name
100 Fresh air equipment 10 First heat exchange system
20 Second heat exchange system 11 First compressor
12 First heat exchange module 13 First fresh air heat exchanger
14 Second fresh air heat exchanger 15 First throttling element
16 Second throttling element 17 Third throttling element
18 First one-way valve 19 Second one-way valve
1 Third one-way valve 2 Fourth one-way valve
3 Reversing device 4 Fresh air channel
5 Exhaust channel 6 Fresh air fan
7 Air supply valve 8 Exhaust fan
9 Exhaust valve 27 Second compressor
21 Second outdoor heat exchanger 22 Third fresh air heat exchanger
23 Fourth fresh air heat exchanger 24 Fourth throttling element
25 Fifth one-way valve 26 Fifth throttling element
30 Side ventilation valve 31 First communication port
32 Second communication port 33 Inflow port
34 Outflow opening 35 First outdoor heat exchanger
36 Heat recovery heat exchanger 37 Outdoor fan
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a fresh air dehumidifier in a hardware operation environment according to an embodiment of the present invention.
As shown in fig. 1, the fresh air dehumidifier may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a Wireless interface (e.g., a Wireless-Fidelity (Wi-Fi) interface). The Memory 1005 may be a high-speed random access Memory (Random Access Memory, RAM) Memory or a stable Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the configuration shown in FIG. 1 is not limiting and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a fresh air fan anti-icing program may be included in the memory 1005 as one type of storage medium.
In the fresh air dehumidifier shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the fresh air dehumidifier of the present invention may be disposed in the fresh air dehumidifier, and the fresh air dehumidifier invokes the fresh air fan anti-icing program stored in the memory 1005 through the processor 1001, and executes the fresh air fan anti-icing method provided by the embodiment of the present invention.
The embodiment of the invention provides an anti-icing method for a fresh air machine, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the anti-icing method for the fresh air machine.
In this embodiment, the new fan anti-icing method includes the following steps:
Step S10: and when the fresh air machine is in refrigeration operation, acquiring temperature and humidity information of the fresh air machine and the operation time of the compressor.
In this embodiment, the execution main body of the embodiment may be the fresh air blower anti-icing device, where the fresh air blower anti-icing device has functions of data processing, data communication, program running, and the like, and the fresh air blower anti-icing device may be a controller in the fresh air dehumidifier. Of course, other devices with similar functions may be used, and the implementation conditions are not limited thereto. For convenience of explanation, the embodiment will be described with reference to the new wind turbine anti-icing device.
It should be noted that, the temperature of the evaporator coil of the traditional fresh air dehumidifier is affected by the length of the connecting pipeline, if the connecting pipeline is too long, a larger pressure drop exists in the refrigerant, so that the difference between the temperature of the coil and the evaporating temperature of the low-pressure pipeline of the external machine is increased, and when the temperature difference between the temperature of the coil and the evaporating temperature of the low-pressure pipeline of the external machine exceeds a certain threshold value, the low-pressure pipeline of the external machine is frozen, so that the vibration of the pipeline of the external machine is increased.
In order to solve the above problems, in this embodiment, the icing state of the external machine pipeline can be determined according to the temperature and humidity information of the fresh air machine and the operation duration of the compressor, and when the icing of the low-pressure pipeline of the external machine is detected, the air suction temperature is improved by adjusting the rotation speed of the compressor in the heat pump system, so that the possibility of the icing of the external machine is reduced.
In a specific implementation, in this embodiment, a fresh air dehumidifier structure is first provided, as shown in fig. 3 and fig. 4. Fresh air equipment 100 includes casing and first heat transfer system 10, be equipped with fresh air channel 4 in the casing, first heat transfer system 10 includes: the fresh air heat exchanger structure is positioned in the fresh air channel 4 and is provided with a refrigerant pipeline; the first switching device is communicated with the fresh air heat exchanger structure and is used for switching the flow direction of the refrigerant in the fresh air heat exchanger structure; under different operation modes of the first heat exchange system 10, the refrigerant of the first heat exchange system 10 passes through the refrigerant pipeline located at the downstream of the fresh air channel 4 and then passes through the refrigerant pipeline located at the upstream of the fresh air channel 4. The fresh air channel 4 is a channel through which the fresh air device 100 sends outdoor fresh air into the room, and the exhaust channel 5 is a channel through which the fresh air device 100 discharges indoor air to the outside. The fresh air heat exchanger structure is arranged in the first refrigerant flow path, and the first heat exchange system 10 further comprises: the first compressor 11, the first heat exchange module 12 and the reversing device 3, wherein the first compressor 11 is arranged in the first refrigerant flow path and is provided with a first exhaust port and a first return port; the first heat exchange module 12 is disposed in the first refrigerant flow path and is in communication with the first switching device, the first heat exchange module 12 includes a first outdoor heat exchanger 35 and a heat recovery heat exchanger 36 which are disposed in series, the heat recovery heat exchanger 36 is disposed in the exhaust passage 5, the first outdoor heat exchanger 35 is disposed outside the housing (main housing), the first compressor 11 is mounted in the exhaust passage 5 or outside the housing (main housing), the heat recovery heat exchanger 36 is disposed in the exhaust passage 5, after heat exchange between the air in the exhaust passage 5 and the heat recovery heat exchanger 36 occurs, then the air is discharged from the air discharge channel 5, so that the heat of the air discharged from the air discharge channel 5 can be recovered; the reversing device 3 is connected to the first exhaust port, the first return port, the first heat exchange module 12 and the first switching device, and the reversing device 3 is used for switching the flow direction of the refrigerant, so that the refrigerant passes through the first heat exchange module 12 and then the first switching device, or so that the refrigerant passes through the first switching device and then passes through the first heat exchange module 12. In order to realize the reheat dehumidification function of the fresh air device 100, the fresh air heat exchanger structure comprises a first fresh air heat exchanger 13 and a second fresh air heat exchanger 14 which are sequentially connected in series; the first fresh air heat exchanger 13 is located at the downstream of the fresh air channel 4 relative to the second fresh air heat exchanger 14, the outflow port 34 is connected to the first fresh air heat exchanger 13, and the inflow port 33 is connected to the second fresh air heat exchanger 14. In order to reduce control elements in the fresh air equipment 100 and promote stability of the fresh air equipment 100, the first switching device has a first communication port 31, a second communication port 32, an inflow port 33 and an outflow port 34, the fresh air heat exchanger structure communicates the outflow port 34 and the inflow port 33, the first switching device comprises: a first check valve 18, a second check valve 19, a third check valve 1, and a fourth check valve 2, the first check valve 18 being connected between the first communication port 31 and the inflow port 33, the first check valve 18 being in communication in a direction from the inflow port 33 to the first communication port 31; the second check valve 19 is connected between the first communication port 31 and the outflow port 34, and the second check valve 19 is communicated in the direction from the first communication port 31 to the outflow port 34; the third check valve 1 is connected between the inflow port 33 and the second communication port 32, and the third check valve 1 is communicated in the direction from the inflow port 33 to the second communication port 32; the fourth one-way valve 2 is connected between the outflow port 34 and the second communication port 32, and the fourth one-way valve 2 is conducted in the direction from the second communication port 32 to the outflow port 34, so that the first switching device is composed of one-way valves, and compared with the four-way valve or two three-way valve, no control element is needed, and the stability of the fresh air device 100 is higher.
The fresh air heat exchanger structure comprises a first fresh air heat exchanger 13 and a second fresh air heat exchanger 14 which are sequentially connected in series; the first fresh air heat exchanger 13 is located at the downstream of the fresh air channel 4 relative to the second fresh air heat exchanger 14, the outflow port 34 is connected to the first fresh air heat exchanger 13, and the inflow port 33 is connected to the second fresh air heat exchanger 14.
The first heat exchange system 10 further includes a first throttling element 15 disposed on the first refrigerant flow path, the first throttling element 15 being located between the first heat exchange module 12 and the first switching device. The first heat exchange system 10 further includes a second throttling element 16, where the second throttling element 16 is disposed on a serial flow path between the first fresh air heat exchanger 13 and the second fresh air heat exchanger 14, so as to throttle the refrigerant flowing out of the first fresh air heat exchanger 13.
Further, the fresh air device 100 further includes a second heat exchange system 20, a second refrigerant flow path is formed on the second heat exchange system 20, the second heat exchange system 20 includes a second outdoor heat exchanger 21, a second compressor 27, a third fresh air heat exchanger 22 and a fourth fresh air heat exchanger 23 which are disposed in the second refrigerant flow path, the third fresh air heat exchanger 22 and the fourth fresh air heat exchanger 23 are disposed in the fresh air channel 4, and at this time, the second outdoor heat exchanger 21 and the second compression/27 may also be disposed in the exhaust channel 5, so that the fresh air device 100 does not need an outdoor unit at all, and saves positions.
The second heat exchange system 20 further includes a second switching device, configured to switch the second outdoor heat exchanger 21 to be connected to the third fresh air heat exchanger 22 or to be simultaneously connected to the third fresh air heat exchanger 22 and the fourth fresh air heat exchanger 23. The second switching device comprises a fourth throttling element 24 and a fifth one-way valve 25 (the fifth one-way valve 25 can be replaced by an electromagnetic valve), and the fourth throttling element 24 is arranged on the second refrigerant flow path and is positioned between the third fresh air heat exchanger 22 and the fourth fresh air heat exchanger 23; the fifth check valve 25 is connected in parallel with the third fresh air heat exchanger 22 and the fourth throttling element 24, and the conducting direction of the fifth check valve 25 is from the fourth fresh air heat exchanger 23 to the second outdoor heat exchanger 21.
So set up, two sets of heat transfer systems exist two evaporators in fresh air channel, have two evaporating temperature, and the upper reaches is higher than low reaches evaporating temperature, and two-stage evaporation refrigeration has promoted the energy consumption greatly in one-level evaporation refrigeration's scheme compared. And the upstream heat exchange system can preheat or precool air first and then exchange heat through the downstream heat exchange system, so that the air outlet temperature can be effectively reduced in a refrigeration mode and the air outlet temperature can be improved in a heating mode. Of course, the heat exchange system at the upstream may cool the air, and the heat exchange system at the downstream may heat the air, thereby realizing the reheat dehumidification function.
Because the first heat exchange system 10 and the second heat exchange system 20 coexist, two outdoor units are often required to be arranged on the first heat exchange system 10 and the second heat exchange system 20, so that the two outdoor units are installed to occupy two outdoor units, occupy too many positions, and are installed, the workload of installation is also large, therefore, the shell comprises a main machine shell and an outdoor unit shell, the main machine shell is internally provided with the fresh air channel 4 and the exhaust air channel 5, the first heat exchange system 10 also comprises a first compressor 11 and a first heat exchange module 12, the first heat exchange module 12 comprises a first outdoor heat exchanger 35 and a heat recovery heat exchanger which are arranged in series, the heat recovery heat exchanger is arranged in the exhaust air channel 5, the fourth heat exchanger 23 is arranged in the fresh air channel 4, the first compressor 11, the first outdoor heat exchanger 35, the second compressor 27, the second outdoor heat exchanger 21 and the outdoor fan 37 are all arranged in the outdoor housing, so that the heat recovery heat exchanger 36 is arranged in the air exhaust channel 5, the fourth fresh air heat exchanger 23 is arranged in the fresh air channel 4, the first compressor 11, the first outdoor heat exchanger 35, the second compressor 27, the second outdoor heat exchanger 21 and the outdoor fan 37 are all arranged in the outdoor housing, part of the parts of the outdoor unit is arranged in the air exhaust channel 5, the rest of the parts are arranged in the housing of the outdoor unit, the requirements of the first heat exchange system 10 and the second heat exchange system 20 can be met only by arranging one outdoor unit, the occupied position of the outdoor unit is reduced, and the workload of the outdoor unit installation is reduced.
It should be noted that, the temperature and humidity information of the fresh air fan includes: the air suction temperature, the fresh air temperature and the fresh air humidity can be directly collected through an air suction temperature sensor, the air suction temperature sensor is arranged on a refrigerant flow path from an outlet of an evaporator to an inlet of a compressor, if the air suction superheat degree is high, the phenomenon of protection shutdown exists, and if the air suction superheat degree is low, the phenomenon of shutdown is easy to misjudge; the fresh air temperature and the fresh air humidity can be obtained by directly collecting the fresh air temperature and the fresh air humidity through a sensor arranged at the pipeline of the outdoor unit.
In specific implementation, after a new fan receives a control instruction of a user, a refrigeration mode is started according to the control instruction of the user, a compressor is started to refrigerate, and the suction temperature Te, the new air inlet temperature Tx, the new air inlet relative humidity phix and the compressor starting time tp are detected.
In addition, the compressor provided in this embodiment may be a variable frequency compressor, and the fresh air temperature and humidity sensor is preferably a temperature and humidity two-in-one sensor, or may be a combination of a temperature sensor and a relative humidity sensor, which is not particularly limited in this embodiment.
Step S20: and judging the icing state of the external machine pipeline according to the temperature and humidity information of the new fan and the running time of the compressor.
It is understood that the outdoor unit pipe may be a low pressure pipe of the outdoor unit, i.e., a refrigerant pipe connected to the suction port of the compressor in the outdoor unit.
Further, the fresh air fan temperature and humidity information includes: the air suction temperature of the compressor and the temperature and humidity of the environment where the external machine pipeline is positioned;
The method for judging the icing state of the external machine pipeline according to the temperature and humidity information of the fresh air machine and the operation time of the compressor comprises the following steps:
determining a dew point temperature according to the temperature and the humidity;
calculating a temperature difference between the suction temperature and the dew point temperature;
and judging the icing state of the external machine pipeline according to the suction temperature, the temperature difference value and the running time of the compressor.
According to the different heat exchanger settings in the heat exchange system, in the external machine pipeline, two setting modes exist, namely, the two setting modes are only arranged in the outdoor machine, or one part of the two setting modes are arranged in the outdoor machine, and the other part of the two setting modes are arranged in the fresh air channel and used as heat recovery heat exchangers, so that in the embodiment, the temperature and the humidity of the environment where the external machine pipeline is located can be detected through a temperature and humidity sensor arranged in the fresh air channel of the fresh air machine (namely, the fresh air temperature and humidity), and the temperature and humidity of the environment can also be detected through a temperature and humidity sensor arranged in the external machine (namely, the outdoor temperature and the humidity), and the embodiment is not particularly limited.
In a specific implementation, according to temperature and humidity information of the fresh air machine and operation time of the compressor, judging that the icing state of the outer machine pipeline can be a temperature difference value between fresh air dew point temperature and air suction temperature or a magnitude relation between a temperature difference value between outdoor dew point temperature and air suction temperature and a set temperature threshold, wherein the dew point temperature comprises the fresh air dew point temperature and the outdoor dew point temperature, and the calculation of the fresh air dew point temperature can be obtained by combining the fresh air temperature and the fresh air humidity, and a specific calculation formula is as follows:
Wherein Tx is the fresh air inlet temperature, phix is the fresh air inlet relative humidity phix, and the constant in the formula above for Td dew point temperature is the dew point constant.
Similarly, the calculation formula of the outdoor dew point temperature can be:
Where Tx1 is the outdoor inlet temperature, Φx1 is the outdoor inlet relative humidity Φx, td1, the outdoor dew point temperature, and the constant in the above equation is the dew point constant.
Further, in order to accurately judge the icing state of the external machine pipeline, the judging condition is that the air suction temperature is greater than a first preset temperature threshold, the temperature difference value is smaller than a second preset temperature threshold, the operation duration of the compressor is smaller than one of three judging conditions of the first preset time threshold, wherein the temperature difference value is the temperature difference value between the air suction temperature and the fresh air dew point temperature or the outdoor dew point temperature, the fresh air dehumidifier judges that the icing state of the external machine pipeline is a normal state when any one of the three conditions is met, and the icing phenomenon of the low-pressure pipeline of the external machine cannot exist, and the first preset temperature threshold is smaller than the second preset temperature threshold.
In a specific implementation, the first preset temperature threshold and the second preset temperature threshold may be a certain range or a certain value between-5525 ℃, and the first preset temperature threshold is smaller than the second preset temperature threshold, and the first preset time threshold may be a certain range or a certain value between 0520min, which is not limited in this embodiment.
Step S30: and when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline, adjusting the running state of the new fan.
It can be understood that when the air suction temperature is not greater than the first preset temperature threshold, and the temperature difference is not less than the second preset temperature threshold, and the operation duration of the compressor is not less than the first preset time threshold, it is determined that the icing phenomenon exists in the external machine pipeline, in order to solve the icing phenomenon of the low pressure pipeline of the external machine, the air suction temperature can be increased by reducing the rotation speed of the compressor, so as to reduce the difference between the air suction temperature and the fresh air dew point temperature, or the opening degree of a throttling element can be adjusted, or the operation such as the rotation speed of a fresh air fan can be adjusted, wherein the throttling element can be an electronic expansion valve, or a throttling component such as a capillary tube or a valve core, and the electronic expansion valve is taken as an example in this embodiment and the following embodiments.
In specific implementation, when the rotating speed of the compressor is reduced, the opening of the electronic expansion valve can be increased, and the rotating speed of the fresh air fan can be increased, wherein the electronic expansion valve is arranged in a refrigerant pipeline and used for throttling a refrigerant, the fresh air fan is arranged in a fresh air channel of the fresh air fan and used for controlling fresh air quantity, and if the fresh air dehumidifier still meets the icing protection condition of an external machine pipeline after the control means of reducing the rotating speed of the compressor, increasing the opening of the expansion valve, increasing the rotating speed of the fresh air fan and the like, the compressor can be closed firstly so as to slow down the icing of a low-pressure pipeline of the external machine.
In the structure of the heat pump system of the fresh air dehumidifier provided in this embodiment, there are three mounting positions of the expansion valve and the reheater, specifically referring to fig. 5, 6 and 7, in fig. 5, 6 and 7, 1 is a compressor; 2 is an outdoor heat exchanger, which is used as a condenser in the present embodiment; 3 is a reheater; 4 is a throttling element (preferably an electronic expansion valve); 5 is an indoor heat exchanger, which is used as an evaporator in the present embodiment; 6 is an external fan motor; 7 is an internal machine fan motor; 8 is a temperature and humidity sensor; 9 is a temperature sensor.
In specific implementation, a first preset temperature threshold value Tm1 is set to 0 ℃, a second preset temperature threshold value Tm2 is set to 2 ℃, the operation time Tp of the compressor is set to 3min, when a refrigerating mode is started, the compressor, a fresh air fan motor, an outdoor fan motor and an electronic expansion valve are started, when the fresh air temperature is detected to 35 ℃, the fresh air relative humidity is 60%, the fresh air dew point temperature is calculated to be 26 ℃, the suction temperature Te= -3 ℃ is less than Tm1, the duration is 3min and more than t1, TT=29 ℃ and more than Tm2 are calculated, tp=10 min and more than Tp are detected, the icing protection condition of an external machine pipeline is judged to be met, the rotation speed of the compressor is firstly reduced during the protection period, the opening degree of the expansion valve is increased to improve the suction temperature, and if the icing protection condition of the external machine pipeline is met, the compressor is closed.
According to the invention, when the fresh air machine is in operation, temperature and humidity information of the fresh air machine and the operation time of the compressor are obtained; judging the icing state of an external machine pipeline according to the temperature and humidity information of the new fan and the running time of the compressor; when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline, the running state of the new fan is adjusted, the icing state of the external machine pipeline can be judged according to the temperature and humidity information of the new fan and the running time of the compressor, and when the icing of the low-pressure pipeline of the external machine is detected, the rotating speed of the compressor in the heat pump system is adjusted, so that the air suction temperature is improved, the icing possibility of the external machine pipeline is reduced, and the user experience is improved.
Referring to fig. 8, fig. 8 is a schematic flow chart of a second embodiment of a new fan anti-icing method according to the present invention.
Based on the above first embodiment, in the method for preventing ice formation of a fresh air machine according to this embodiment, after step S30, the method further includes:
Step S40: and after a first preset time interval, acquiring the current icing state of the external machine pipeline of the new fan.
It may be appreciated that the first preset duration may be a time set by a user for rechecking the low-pressure pipeline state of the outdoor unit, for example: and 3min, acquiring the current icing state of the external machine pipeline of the fresh air machine and determining the current icing state of the external machine pipeline of the fresh air machine by comparing the magnitude relation between the air suction temperature and a first preset temperature threshold value, comparing the magnitude relation between a temperature difference value and a second preset temperature threshold value and comparing the magnitude relation between the running duration of the compressor and the first preset time threshold value.
Step S50: and closing the compressor when the current icing state of the external machine pipeline still meets the preset icing protection condition of the external machine pipeline.
In a specific implementation, after the compressor is turned off, if the fresh air dehumidifier is detected to meet the icing and exiting condition of the low-pressure pipeline of the outdoor unit, the operation refrigeration mode of the compressor can be controlled, wherein the icing and exiting condition of the low-pressure pipeline of the outdoor unit is as follows: acquiring the stop operation time of the compressor; and when the operation stopping time is not less than a second preset time threshold and the air suction temperature in the second preset time is not less than a preset temperature threshold, controlling the fresh air refrigerator to perform operations, for example: the compressor closing time length satisfies 3min, and the suction temperature Te is not less than 8 ℃ for 30s, which is not particularly limited in this embodiment.
According to the embodiment, the fresh air dehumidifier after the rotation speed of the compressor is reduced is determined to carry out icing detection so as to judge whether the icing phenomenon of the low-pressure pipeline of the outdoor unit is effectively removed, and if the icing phenomenon is still detected, the operation of the fresh air dehumidifier can be stopped by closing the compressor so as to solve the icing condition of the low-pressure pipeline of the outdoor unit.
In addition, the embodiment of the invention also provides a storage medium, wherein a new fan anti-icing program is stored on the storage medium, and the new fan anti-icing program realizes the steps of the new fan anti-icing method when being executed by a processor.
Because the storage medium adopts all the technical schemes of all the embodiments, the storage medium has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here.
Referring to fig. 9, fig. 9 is a block diagram illustrating a first embodiment of an anti-icing assembly for a fresh air machine according to the present invention.
As shown in fig. 9, the anti-icing device for a fresh air machine provided by the embodiment of the invention includes:
And the acquisition module 10 is used for acquiring temperature and humidity information of the fresh air machine and the operation time of the compressor when the fresh air machine is in operation.
It should be noted that, the temperature of the evaporator coil of the traditional fresh air dehumidifier is affected by the length of the connecting pipeline, if the connecting pipeline is too long, a larger pressure drop exists in the refrigerant, so that the difference between the temperature of the coil and the evaporating temperature of the low-pressure pipeline of the external machine is increased, and when the temperature difference between the temperature of the coil and the evaporating temperature of the low-pressure pipeline of the external machine exceeds a certain threshold value, the low-pressure pipeline of the external machine is frozen, so that the vibration of the pipeline of the external machine is increased.
In order to solve the above problems, in this embodiment, the icing state of the external machine pipeline can be determined according to the temperature and humidity information of the fresh air machine and the operation duration of the compressor, and when the icing of the low-pressure pipeline of the external machine is detected, the air suction temperature is improved by adjusting the rotation speed of the compressor in the heat pump system, so that the possibility of the icing of the external machine is reduced.
In a specific implementation, in this embodiment, a fresh air dehumidifier structure is first provided, as shown in fig. 3 and fig. 4. Fresh air equipment 100 includes casing and first heat transfer system 10, be equipped with fresh air channel 4 in the casing, first heat transfer system 10 includes: the fresh air heat exchanger structure is positioned in the fresh air channel 4 and is provided with a refrigerant pipeline; the first switching device is communicated with the fresh air heat exchanger structure and is used for switching the flow direction of the refrigerant in the fresh air heat exchanger structure; under different operation modes of the first heat exchange system 10, the refrigerant of the first heat exchange system 10 passes through the refrigerant pipeline located at the downstream of the fresh air channel 4 and then passes through the refrigerant pipeline located at the upstream of the fresh air channel 4. The fresh air channel 4 is a channel through which the fresh air device 100 sends outdoor fresh air into the room, and the exhaust channel 5 is a channel through which the fresh air device 100 discharges indoor air to the outside. The fresh air heat exchanger structure is arranged in the first refrigerant flow path, and the first heat exchange system 10 further comprises: the first compressor 11, the first heat exchange module 12 and the reversing device 3, wherein the first compressor 11 is arranged in the first refrigerant flow path and is provided with a first exhaust port and a first return port; the first heat exchange module 12 is disposed in the first refrigerant flow path and is in communication with the first switching device, the first heat exchange module 12 includes a first outdoor heat exchanger 35 and a heat recovery heat exchanger 36 which are disposed in series, the heat recovery heat exchanger 36 is disposed in the exhaust passage 5, the first outdoor heat exchanger 35 is disposed outside the housing (main housing), the first compressor 11 is mounted in the exhaust passage 5 or outside the housing (main housing), the heat recovery heat exchanger 36 is disposed in the exhaust passage 5, after heat exchange between the air in the exhaust passage 5 and the heat recovery heat exchanger 36 occurs, then the air is discharged from the air discharge channel 5, so that the heat of the air discharged from the air discharge channel 5 can be recovered; the reversing device 3 is connected to the first exhaust port, the first return port, the first heat exchange module 12 and the first switching device, and the reversing device 3 is used for switching the flow direction of the refrigerant, so that the refrigerant passes through the first heat exchange module 12 and then the first switching device, or so that the refrigerant passes through the first switching device and then passes through the first heat exchange module 12. In order to realize the reheat dehumidification function of the fresh air device 100, the fresh air heat exchanger structure comprises a first fresh air heat exchanger 13 and a second fresh air heat exchanger 14 which are sequentially connected in series; the first fresh air heat exchanger 13 is located at the downstream of the fresh air channel 4 relative to the second fresh air heat exchanger 14, the outflow port 34 is connected to the first fresh air heat exchanger 13, and the inflow port 33 is connected to the second fresh air heat exchanger 14. In order to reduce control elements in the fresh air equipment 100 and promote stability of the fresh air equipment 100, the first switching device has a first communication port 31, a second communication port 32, an inflow port 33 and an outflow port 34, the fresh air heat exchanger structure communicates the outflow port 34 and the inflow port 33, the first switching device comprises: a first check valve 18, a second check valve 19, a third check valve 1, and a fourth check valve 2, the first check valve 18 being connected between the first communication port 31 and the inflow port 33, the first check valve 18 being in communication in a direction from the inflow port 33 to the first communication port 31; the second check valve 19 is connected between the first communication port 31 and the outflow port 34, and the second check valve 19 is communicated in the direction from the first communication port 31 to the outflow port 34; the third check valve 1 is connected between the inflow port 33 and the second communication port 32, and the third check valve 1 is communicated in the direction from the inflow port 33 to the second communication port 32; the fourth one-way valve 2 is connected between the outflow port 34 and the second communication port 32, and the fourth one-way valve 2 is conducted in the direction from the second communication port 32 to the outflow port 34, so that the first switching device is composed of one-way valves, and compared with the four-way valve or two three-way valve, no control element is needed, and the stability of the fresh air device 100 is higher.
The fresh air heat exchanger structure comprises a first fresh air heat exchanger 13 and a second fresh air heat exchanger 14 which are sequentially connected in series; the first fresh air heat exchanger 13 is located at the downstream of the fresh air channel 4 relative to the second fresh air heat exchanger 14, the outflow port 34 is connected to the first fresh air heat exchanger 13, and the inflow port 33 is connected to the second fresh air heat exchanger 14.
The first heat exchange system 10 further includes a first throttling element 15 disposed on the first refrigerant flow path, the first throttling element 15 being located between the first heat exchange module 12 and the first switching device. The first heat exchange system 10 further includes a second throttling element 16, where the second throttling element 16 is disposed on a serial flow path between the first fresh air heat exchanger 13 and the second fresh air heat exchanger 14, so as to throttle the refrigerant flowing out of the first fresh air heat exchanger 13.
Further, the fresh air device 100 further includes a second heat exchange system 20, a second refrigerant flow path is formed on the second heat exchange system 20, the second heat exchange system 20 includes a second outdoor heat exchanger 21, a second compressor 27, a third fresh air heat exchanger 22 and a fourth fresh air heat exchanger 23 which are disposed in the second refrigerant flow path, the third fresh air heat exchanger 22 and the fourth fresh air heat exchanger 23 are disposed in the fresh air channel 4, and at this time, the second outdoor heat exchanger 21 and the second compression/27 may also be disposed in the exhaust channel 5, so that the fresh air device 100 does not need an outdoor unit at all, and saves positions.
The second heat exchange system 20 further includes a second switching device, configured to switch the second outdoor heat exchanger 21 to be connected to the third fresh air heat exchanger 22 or to be simultaneously connected to the third fresh air heat exchanger 22 and the fourth fresh air heat exchanger 23. The second switching device comprises a fourth throttling element 24 and a fifth one-way valve 25 (the fifth one-way valve 25 can be replaced by an electromagnetic valve), and the fourth throttling element 24 is arranged on the second refrigerant flow path and is positioned between the third fresh air heat exchanger 22 and the fourth fresh air heat exchanger 23; the fifth check valve 25 is connected in parallel with the third fresh air heat exchanger 22 and the fourth throttling element 24, and the conducting direction of the fifth check valve 25 is from the fourth fresh air heat exchanger 23 to the second outdoor heat exchanger 21.
So set up, two sets of heat transfer systems exist two evaporators in fresh air channel, have two evaporating temperature, and the upper reaches is higher than low reaches evaporating temperature, and two-stage evaporation refrigeration has promoted the energy consumption greatly in one-level evaporation refrigeration's scheme compared. And the upstream heat exchange system can preheat or precool air first and then exchange heat through the downstream heat exchange system, so that the air outlet temperature can be effectively reduced in a refrigeration mode and the air outlet temperature can be improved in a heating mode. Of course, the heat exchange system at the upstream may cool the air, and the heat exchange system at the downstream may heat the air, thereby realizing the reheat dehumidification function.
Because the first heat exchange system 10 and the second heat exchange system 20 coexist, two outdoor units are often required to be arranged on the first heat exchange system 10 and the second heat exchange system 20, so that the two outdoor units are installed to occupy two outdoor units, occupy too many positions, and are installed, the workload of installation is also large, therefore, the shell comprises a main machine shell and an outdoor unit shell, the main machine shell is internally provided with the fresh air channel 4 and the exhaust air channel 5, the first heat exchange system 10 also comprises a first compressor 11 and a first heat exchange module 12, the first heat exchange module 12 comprises a first outdoor heat exchanger 35 and a heat recovery heat exchanger which are arranged in series, the heat recovery heat exchanger is arranged in the exhaust air channel 5, the fourth heat exchanger 23 is arranged in the fresh air channel 4, the first compressor 11, the first outdoor heat exchanger 35, the second compressor 27, the second outdoor heat exchanger 21 and the outdoor fan 37 are all arranged in the outdoor housing, so that the heat recovery heat exchanger 36 is arranged in the air exhaust channel 5, the fourth fresh air heat exchanger 23 is arranged in the fresh air channel 4, the first compressor 11, the first outdoor heat exchanger 35, the second compressor 27, the second outdoor heat exchanger 21 and the outdoor fan 37 are all arranged in the outdoor housing, part of the parts of the outdoor unit is arranged in the air exhaust channel 5, the rest of the parts are arranged in the housing of the outdoor unit, the requirements of the first heat exchange system 10 and the second heat exchange system 20 can be met only by arranging one outdoor unit, the occupied position of the outdoor unit is reduced, and the workload of the outdoor unit installation is reduced.
It should be noted that, the temperature and humidity information of the fresh air fan includes: the air suction temperature, the fresh air temperature and the fresh air humidity can be directly collected through an air suction temperature sensor, the air suction temperature sensor is arranged on a refrigerant flow path from an outlet of an evaporator to an inlet of a compressor, if the air suction superheat degree is high, the phenomenon of protection shutdown exists, and if the air suction superheat degree is low, the phenomenon of shutdown is easy to misjudge; the fresh air temperature and the fresh air humidity can be obtained by directly collecting the fresh air temperature and the fresh air humidity through a sensor arranged at the pipeline of the outdoor unit.
In specific implementation, after a new fan receives a control instruction of a user, a refrigeration mode is started according to the control instruction of the user, a compressor is started to refrigerate, and the suction temperature Te, the new air inlet temperature Tx, the new air inlet relative humidity phix and the compressor starting time tp are detected.
In addition, the compressor provided in this embodiment may be a variable frequency compressor, and the fresh air temperature and humidity sensor is preferably a temperature and humidity two-in-one sensor, or may be a combination of a temperature sensor and a relative humidity sensor, which is not particularly limited in this embodiment.
And the judging module 20 is used for judging the icing state of the external machine pipeline according to the temperature and humidity information of the fresh air machine and the running time of the compressor.
It is understood that the outdoor unit pipe may be a low pressure pipe of the outdoor unit, i.e., a refrigerant pipe connected to the suction port of the compressor in the outdoor unit.
Further, the fresh air fan temperature and humidity information includes: the air suction temperature of the compressor and the temperature and humidity of the environment where the external machine pipeline is positioned;
The method for judging the icing state of the external machine pipeline according to the temperature and humidity information of the fresh air machine and the operation time of the compressor comprises the following steps:
determining a dew point temperature according to the temperature and the humidity;
calculating a temperature difference between the suction temperature and the dew point temperature;
and judging the icing state of the external machine pipeline according to the suction temperature, the temperature difference value and the running time of the compressor.
According to the different heat exchanger settings in the heat exchange system, in the external machine pipeline, two setting modes exist, namely, the two setting modes are only arranged in the outdoor machine, or one part of the two setting modes are arranged in the outdoor machine, and the other part of the two setting modes are arranged in the fresh air channel and used as heat recovery heat exchangers, so that in the embodiment, the temperature and the humidity of the environment where the external machine pipeline is located can be detected through a temperature and humidity sensor arranged in the fresh air channel of the fresh air machine (namely, the fresh air temperature and humidity), and the temperature and humidity of the environment can also be detected through a temperature and humidity sensor arranged in the external machine (namely, the outdoor temperature and the humidity), and the embodiment is not particularly limited.
In a specific implementation, according to temperature and humidity information of the fresh air machine and operation time of the compressor, judging that the icing state of the outer machine pipeline can be a temperature difference value between fresh air dew point temperature and air suction temperature or a magnitude relation between a temperature difference value between outdoor dew point temperature and air suction temperature and a set temperature threshold, wherein the dew point temperature comprises the fresh air dew point temperature and the outdoor dew point temperature, and the calculation of the fresh air dew point temperature can be obtained by combining the fresh air temperature and the fresh air humidity, and a specific calculation formula is as follows:
Wherein Tx is the fresh air inlet temperature, phix is the fresh air inlet relative humidity phix, and the constant in the formula above for Td dew point temperature is the dew point constant.
Similarly, the calculation formula of the outdoor dew point temperature can be:
Where Tx1 is the outdoor inlet temperature, Φx1 is the outdoor inlet relative humidity Φx, td1, the outdoor dew point temperature, and the constant in the above equation is the dew point constant.
Further, in order to accurately judge the icing state of the external machine pipeline, the judging condition is that the air suction temperature is greater than a first preset temperature threshold, the temperature difference is smaller than a second preset temperature threshold, the operation duration of the compressor is smaller than one of three judging conditions of the first preset time threshold, the fresh air dehumidifier judges that the icing state of the external machine pipeline is a normal state when any one of the three conditions is met, the icing phenomenon of the low-pressure pipeline of the external machine cannot exist, and the first preset temperature threshold is smaller than the second preset temperature threshold.
In a specific implementation, the first preset temperature threshold and the second preset temperature threshold may be a certain range or a certain value between-5525 ℃, and the first preset temperature threshold is smaller than the second preset temperature threshold, and the first preset time threshold may be a certain range or a certain value between 0520min, which is not limited in this embodiment.
And the control module 30 is used for adjusting the running state of the fresh air machine when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline.
It can be understood that when the air suction temperature is not greater than the first preset temperature threshold, and the temperature difference is not less than the second preset temperature threshold, and the operation duration of the compressor is not less than the first preset time threshold, it is determined that the icing phenomenon exists in the external machine pipeline, in order to solve the icing phenomenon of the low pressure pipeline of the external machine, the air suction temperature can be increased by reducing the rotation speed of the compressor, so as to reduce the difference between the air suction temperature and the fresh air dew point temperature, or the opening degree of a throttling element can be adjusted, or the operation such as the rotation speed of a fresh air fan can be adjusted, wherein the throttling element can be an electronic expansion valve, or a throttling component such as a capillary tube or a valve core, and the electronic expansion valve is taken as an example in this embodiment and the following embodiments.
In a specific implementation, the opening of the expansion valve can be increased and the rotation speed of the fresh air fan can be increased while the rotation speed of the compressor is reduced, wherein the expansion valve is arranged in a refrigerant pipeline and used for throttling a refrigerant, the expansion valve can be an electronic expansion valve or a throttling component such as a capillary tube or a valve core, the fresh air fan is arranged in the fresh air channel of the fresh air fan and used for controlling the fresh air quantity, and if the fresh air dehumidifier still meets the icing protection condition of an external machine pipeline after the control means such as reducing the rotation speed of the compressor, increasing the opening of the expansion valve and increasing the rotation speed of the fresh air fan, the compressor can be closed firstly so as to slow down the icing of a low-pressure pipeline of the external machine.
In the structure of the heat pump system of the fresh air dehumidifier provided in this embodiment, there are three mounting positions of the expansion valve and the reheater, specifically referring to fig. 5, 6 and 7, in fig. 5, 6 and 7, 1 is a compressor; 2 is an outdoor heat exchanger, which is used as a condenser in the present embodiment; 3 is a reheater; 4 is a throttling element (preferably an electronic expansion valve); 5 is an indoor heat exchanger, which is used as an evaporator in the present embodiment; 6 is an external fan motor; 7 is an internal machine fan motor; 8 is a temperature and humidity sensor; 9 is a temperature sensor.
In specific implementation, a first preset temperature threshold Tm1 is set to 0 ℃, a second preset temperature threshold Tm2 is set to 2 ℃, the operation time Tp of the compressor is set to 3min, when a refrigerating mode is started, the compressor, a fresh air fan motor, an outdoor fan motor and an electronic expansion valve are started, when the fresh air temperature is detected to 35 ℃, the fresh air relative humidity is 60%, the fresh air dew point temperature is calculated to be 26 ℃, the suction temperature Te= -3 ℃ is less than Tm1, the duration is 3min and more than t1, TT=29 ℃ and more than Tm2 are calculated, tp=10 min and more than Tp are detected, the icing protection condition of an external machine pipeline is judged to be met, the rotation speed of the compressor is firstly reduced during the protection period, the opening degree of the expansion valve is increased to improve the suction temperature, and if the icing protection condition of the external machine pipeline is met, the compressor is closed.
According to the invention, when the fresh air machine is in operation, temperature and humidity information of the fresh air machine and the operation time of the compressor are obtained; judging the icing state of an external machine pipeline according to the temperature and humidity information of the new fan and the running time of the compressor; when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline, the running state of the new fan is adjusted, the icing state of the external machine pipeline can be judged according to the temperature and humidity information of the new fan and the running time of the compressor, and when the icing of the low-pressure pipeline of the external machine is detected, the rotating speed of the compressor in the heat pump system is adjusted, so that the air suction temperature is improved, the icing possibility of the external machine pipeline is reduced, and the user experience is improved.
It should be understood that the foregoing is illustrative only and is not limiting, and that in specific applications, those skilled in the art may set the invention as desired, and the invention is not limited thereto.
It should be noted that the above-described working procedure is merely illustrative, and does not limit the scope of the present invention, and in practical application, a person skilled in the art may select part or all of them according to actual needs to achieve the purpose of the embodiment, which is not limited herein.
In addition, technical details which are not described in detail in the embodiment can be referred to the new fan anti-icing method provided in any embodiment of the present invention, and are not described here again.
Furthermore, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. Read Only Memory)/RAM, magnetic disk, optical disk) and including several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (10)

1. The new fan anti-icing method is characterized in that the new fan is provided with a compressor for adjusting the temperature of a refrigerant:
When the fresh air machine is in refrigeration operation, temperature and humidity information of the fresh air machine and the operation time of the compressor are obtained;
judging the icing state of an external machine pipeline according to the temperature and humidity information of the new fan and the running time of the compressor; and
And when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline, adjusting the running state of the new fan.
2. The fresh air fan anti-icing method of claim 1, wherein the fresh air fan temperature and humidity information comprises: the air suction temperature of the compressor and the temperature and humidity of the environment where the external machine pipeline is positioned;
The method for judging the icing state of the external machine pipeline according to the temperature and humidity information of the fresh air machine and the operation time of the compressor comprises the following steps:
determining a dew point temperature according to the temperature and the humidity;
calculating a temperature difference between the suction temperature and the dew point temperature;
and judging the icing state of the external machine pipeline according to the suction temperature, the temperature difference value and the running time of the compressor.
3. The method of claim 2, wherein said determining an icing condition of an external machine circuit based on said suction air temperature, said temperature difference, and said compressor run length comprises:
And when the air suction temperature is greater than a first preset temperature threshold, or the temperature difference is smaller than a second preset temperature threshold, or the operation duration of the compressor is smaller than a first preset time threshold, judging that the icing state of the external machine pipeline is a normal state, wherein the first preset temperature threshold is smaller than the second preset temperature threshold.
4. The method for preventing ice formation of a fresh air machine according to claim 2, wherein adjusting the operation state of the fresh air machine when the icing condition of the external machine pipeline satisfies a preset icing protection condition of the external machine pipeline comprises:
And when the suction temperature is not greater than a first preset temperature threshold value, the temperature difference is not less than a second preset temperature threshold value, and the operation duration of the compressor is not less than the first preset time threshold value, the rotating speed of the compressor is reduced.
5. The fresh air fan anti-icing method of claim 2 or 4, wherein the fresh air fan further comprises: the throttling element is arranged in the refrigerant pipeline and used for throttling the refrigerant, and the fresh air fan is arranged in the fresh air channel of the fresh air fan and used for controlling the fresh air quantity;
when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline, the operation state of the new fan is adjusted, and the method further comprises the following steps:
when the air suction temperature is not greater than a first preset temperature threshold value, the temperature difference is not less than a second preset temperature threshold value, and the operation duration of the compressor is not less than the first preset time threshold value, the opening degree of the throttling element is increased, and/or the rotating speed of the fresh air fan is increased.
6. The method for preventing ice formation of a fresh air machine according to any one of claims 1 to 5, wherein after adjusting the operation state of the fresh air machine when the icing state of the external machine pipeline satisfies a preset icing protection condition of the external machine pipeline, the method further comprises:
after a first preset time interval, acquiring the current icing state of an external machine pipeline of the new fan; and
And closing the compressor when the current icing state of the external machine pipeline still meets the preset icing protection condition of the external machine pipeline.
7. The fresh air machine anti-icing method according to claim 6, further comprising, after said turning off the compressor:
Acquiring the stop operation time of the compressor; and
And controlling the fresh air cooling operation when the stop operation time is not less than a second preset time threshold and the air suction temperature in the second preset time is not less than a preset temperature threshold.
8. The utility model provides a new fan anti-icing device which characterized in that, new fan anti-icing device includes:
the acquisition module is used for acquiring temperature and humidity information of the fresh air machine and the operation time of the compressor when the fresh air machine is in operation;
The judging module is used for judging the icing state of the external machine pipeline according to the temperature and humidity information of the fresh air machine and the running time of the compressor;
And the control module is used for adjusting the running state of the fresh air machine when the icing state of the external machine pipeline meets the preset icing protection condition of the external machine pipeline.
9. A storage medium, wherein a fresh air fan anti-icing program is stored on the storage medium, and the fresh air fan anti-icing program realizes the fresh air fan anti-icing method according to any one of claims 1 to 7 when the fresh air fan anti-icing program is executed by a processor.
10. A fresh air dehumidifier, characterized in that the fresh air dehumidifier comprises: a memory, a processor, and a fresh air fan anti-icing program stored on the memory and operable on the processor, the fresh air fan anti-icing program configured to implement the fresh air fan anti-icing method of any of claims 1-7.
CN202211527118.0A 2022-11-30 2022-11-30 Fresh air machine anti-icing method and device, storage medium and fresh air dehumidifier Pending CN118111063A (en)

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CN202211527118.0A CN118111063A (en) 2022-11-30 2022-11-30 Fresh air machine anti-icing method and device, storage medium and fresh air dehumidifier

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CN118111063A true CN118111063A (en) 2024-05-31

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