CN113758070A - Intelligent defrosting control method based on mechanical balance principle - Google Patents
Intelligent defrosting control method based on mechanical balance principle Download PDFInfo
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- CN113758070A CN113758070A CN202010496317.4A CN202010496317A CN113758070A CN 113758070 A CN113758070 A CN 113758070A CN 202010496317 A CN202010496317 A CN 202010496317A CN 113758070 A CN113758070 A CN 113758070A
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- defrosting
- mechanical balance
- fin
- distance
- circular diaphragm
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- 238000010257 thawing Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000012528 membrane Substances 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 3
- 229920002457 flexible plastic Polymers 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims 2
- 239000004033 plastic Substances 0.000 claims 2
- 229920005830 Polyurethane Foam Polymers 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 229920006327 polystyrene foam Polymers 0.000 claims 1
- 239000011496 polyurethane foam Substances 0.000 claims 1
- 230000003068 static effect Effects 0.000 abstract description 10
- 230000007423 decrease Effects 0.000 abstract description 5
- 230000005483 Hooke's law Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
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- 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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/004—Control mechanisms
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Defrosting Systems (AREA)
Abstract
The invention discloses an intelligent defrosting control method based on a mechanical balance principle, wherein the intelligent defrosting control system based on the mechanical balance principle comprises a mechanical balance system, a distance measurement system and an enclosure system: after the heat pump system and the fan start working, cold air enters the L-shaped air pipe from the bell mouth; when the fins begin to frost, the wind speed in the mechanical balance system is increased along with the increase of the thickness of a frost layer; according to Bernoulli's equation, the static pressure decreases with the increase of dynamic pressure, resulting in the reduction of static pressure borne by the circular diaphragm; according to the principle of mechanical balance, the elastic force borne by the circular diaphragm is reduced along with the reduction of static pressure; according to the Hooke's law, the distance between the circular membrane and the fin can be judged to be reduced; and when the distance between the circular membrane and the fin is smaller than or equal to the preset distance, controlling the heat pump system to start defrosting. According to the scheme provided by the invention, the distance between the circular membrane and the fin in the heat pump system is used as the judgment condition for defrosting, so that the starting and stopping of a defrosting mode can be accurately defined, and the defrosting method and the defrosting device can be suitable for defrosting under different environments, thereby avoiding ineffective over defrosting or incomplete defrosting and improving the energy utilization efficiency.
Description
Technical Field
The invention relates to the fields of heating ventilation air conditioning technology, freezing refrigeration and the like, in particular to an intelligent defrosting control method based on a mechanical balance principle.
Background
In a low-temperature environment in winter, after the heating mode of the air conditioner is started, the surface of the heat exchanger of the outdoor unit is easy to frost; for a low-temperature freezing and refrigerating system, an evaporator in an warehouse is easy to frost in a high-humidity low-temperature environment. The formation of the frost layer increases the heat transfer resistance and the air flow resistance of the heat exchanger, reduces the heat exchange performance of the heat exchanger, deteriorates the operation performance of the heat pump system, increases the energy consumption and is easy to damage corresponding equipment. Therefore, the realization of the frostless environment or efficient defrosting of the heat exchanger has important significance for improving the utilization efficiency of the air conditioning system and reducing the energy consumption of the system. In the existing air heat pump system, common defrosting control methods include a timing defrosting method, a time-temperature control method, an air pressure difference defrosting control method and the like. The conventional defrosting control methods have the disadvantages that precise definition of the starting and stopping time of defrosting cannot be realized, so that ineffective over-defrosting or incomplete defrosting is caused, and meanwhile, the risk of disordered defrosting control exists.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an intelligent defrosting control method based on a mechanical balance principle. The start and stop of the defrosting mode of the heat pump system can be accurately controlled, the heat pump system is prevented from being mistakenly defrosted or being unclean in defrosting, defrosting efficiency can be improved, and energy waste is avoided.
The technical scheme adopted by the invention is as follows:
an intelligent defrosting control method based on a mechanical balance principle is characterized in that an intelligent defrosting control system comprises a mechanical balance system, a distance measuring system, an enclosure system and the like;
the mechanical balance system is composed of an L-shaped air pipe, a circular diaphragm, a flexible connection, a spring and the like; the opening end of the L-shaped air pipe is horizontally arranged between two parallel aluminum fins of the evaporator, and cold air can enter the L-shaped air pipe from the bell mouth under the action of the fan; the lower end of the circular diaphragm is connected with the L-shaped air pipe through flexible connection, the flexible connection is made of flexible plastics or canvas and can be freely stretched and contracted, and the circular diaphragm can be guaranteed to freely move in the elastic force variation range; the spring is connected with the upper end of the circular diaphragm and the aluminum fin, and a mechanical balance system of the control system is fixed through the fixing piece, so that the phenomenon that the heat pump system is defrosted by mistake due to movement of the mechanical balance system is avoided.
The distance measuring system consists of a laser distance measuring instrument and a circular diaphragm; the laser range finder is arranged on the aluminum fin of the spring accessory and can emit laser to the circular diaphragm to measure the distance between the circular diaphragm and the fin.
The enclosure system is used for sealing the mechanical balance system and the distance measurement system (except for an opening of the L-shaped air pipe), so that the influence of the wind speed on the stress and the accurate distance measurement of the diaphragm can be avoided, and the phenomenon of mistaken defrosting of the heat pump system when foreign matters or a large amount of dust exist on the surface of the fin can be effectively prevented.
After the heat pump system and the fan start working, cold air enters the L-shaped air pipe from the bell mouth; when the fins begin to frost, the wind speed in the mechanical balance system is increased along with the increase of the thickness of a frost layer; according to Bernoulli's equation, the static pressure decreases with the increase of dynamic pressure, resulting in the reduction of static pressure borne by the circular diaphragm; according to the principle of mechanical balance, the elastic force borne by the circular diaphragm is reduced along with the reduction of static pressure; according to the Hooke's law, the distance between the circular membrane and the fin can be judged to be reduced; and when the distance between the circular membrane and the fin is smaller than or equal to the preset distance, controlling the heat pump system to start defrosting.
Compared with the prior art, the invention has the beneficial effects that
And when the fins of the heat pump system begin to frost, determining whether the heat pump system meets the defrosting condition according to the distance between the circular membrane and the fins. The intelligent defrosting control system can be suitable for defrosting in different areas, improves the adaptability of the heat pump system to the environment, can also accurately control the start and stop of the defrosting mode of the heat pump system, effectively avoids the occurrence of the phenomenon of mistaken defrosting of the heat pump system, improves the defrosting efficiency, reduces the energy consumption of the heat pump system, and ensures the normal and efficient operation of the heat pump system.
Drawings
FIG. 1 is a schematic diagram of the operation of one embodiment of the present invention;
FIG. 2 is a force analysis diagram of a circular diaphragm according to an embodiment of the present invention;
fig. 3 is a schematic view of the inside of the incubator according to an embodiment of the present invention.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown.
As shown in fig. 1, the intelligent defrosting control system based on the mechanical balance principle comprises an aluminum fin 1 of an evaporator, a containment system 2, a circular diaphragm 3, a flexible connection 4, a fan 5, a fixing part 6, an L-shaped air pipe 7, a laser range finder 8, a spring 9 and the like.
The mechanical balance system is composed of an L-shaped air pipe, a circular diaphragm, a flexible connection, a spring and the like; the opening end of the L-shaped air pipe is horizontally arranged between two parallel aluminum fins of the evaporator, and cold air can enter the L-shaped air pipe from the bell mouth under the action of the fan; the lower end of the circular diaphragm is connected with the L-shaped air pipe through flexible connection, the flexible connection is made of flexible plastics or canvas and can be freely stretched and contracted, and the circular diaphragm can be guaranteed to freely move in the elastic force variation range; the spring is connected with the upper end of the circular diaphragm and the aluminum fin; the mechanical balance system of the control system is fixed through the fixing piece, and the phenomenon that the heat pump system is defrosted mistakenly due to movement of the mechanical balance system is avoided.
The distance measuring system consists of a laser distance measuring instrument and a circular diaphragm; the laser range finder is arranged on the aluminum fin of the spring accessory and can emit laser to the circular diaphragm to measure the distance between the circular diaphragm and the fin.
The enclosure system is used for sealing the mechanical balance system and the distance measurement system (except for the opening of the L-shaped air pipe), so that the influence of the wind speed on the stress and the accurate distance measurement of the diaphragm can be avoided, and the phenomenon of mistaken defrosting when foreign matters or a large amount of dust exist on the surface of the fin can be effectively prevented.
After the heat pump system and the fan start working, cold air enters the L-shaped air pipe from the bell mouth; judging whether the fins begin to frost or not according to whether the circular membrane begins to move or not; after the fins begin to frost, measuring the distance d between the circular membrane and the fins; judging whether the heat pump system meets a defrosting starting condition or not according to the distance d between the circular membrane and the fins, and controlling the heat pump system to start defrosting; and judging whether the heat pump system meets a defrosting ending condition or not according to the defrosting time T and the temperature T of the surface of the evaporator, and controlling the heat pump system to end defrosting.
The whole evaporator is placed in an insulation box with an electric air valve, and after the heat pump system and the fan start to work, the fan always keeps constant speed operation. The closing of the electric air valve can ensure that the heat preservation box forms a closed space, reduce the heat loss and improve the energy utilization efficiency; the internal and external pressure can be balanced, and the envelope is prevented from being damaged.
Measuring the distance d between the circular diaphragm and the fin according to a laser range finder; when the circular diaphragm starts to move, the fins start to frost.
When the distance d between the circular diaphragm and the fin is smaller than or equal to the preset distance d0I.e. d<=d0And the frosting thickness m reaches the preset thickness m0And when the defrosting starting condition is met, the heat pump system is determined to meet the defrosting starting condition, and the heat pump system is controlled to start defrosting.
Wherein, in the frosting test, the frosting thickness m is observed artificially; when the thickness m of the required defrosting is reached0While recording the distance d between the circular diaphragm and the fin0The upper limit value of d is defined.
After the heat pump system is controlled to start defrosting, when the defrosting time t of the heat pump system is more than or equal to the protection time t0I.e. t>=t0And the surface temperature T of the evaporator is greater than or equal to the protection temperature T0At =15 ℃ i.e. T>=T0And controlling the heat pump system to finish defrosting.
Therein, lead toObtaining the protection time t in the over-frosting test0A suitable value of.
As shown in fig. 2, after the heat pump system and the fan start to work, cold air enters the L-shaped air duct through the bell mouth; after a period of time, the surface of the fin begins to frost; as the thickness of the fin frost layer increases, the wind speed in the mechanical balance system is increased; according to Bernoulli's equation, the static pressure decreases with the increase of dynamic pressure, resulting in the reduction of static pressure borne by the circular diaphragm; according to the principle of mechanical balance, the elastic force F and the static pressure F applied to the circular diaphragm1Maintaining equilibrium, i.e. elastic force F in response to static pressure F1 Decrease and decrease; according to Hooke's law, it can be judged that the distance between the circular diaphragm and the fin is reduced at the moment, namely, the circular diaphragm starts to move.
As shown in fig. 3, in the cooling mode, the electric air valve is opened, and the air flow in the warehouse forms clockwise annular convection under the action of the fan; when the system reaches the defrosting starting point, the system enters a defrosting mode, the electric air valve is closed, air flow circulates in the closed return channel, and the fan keeps constant speed operation. The closed electric air valve makes the heat preservation box form a closed space, and effectively reduces the heat loss.
The intelligent defrosting control system is not only suitable for a low-temperature high-humidity freezing and refrigerating system, but also suitable for the defrosting process of heat pump systems in different regions. The control system improves the adaptability of the heat pump system to the environment, effectively avoids the condition that the system is mistakenly defrosted or is not completely defrosted, improves the defrosting efficiency and reduces the energy waste.
Claims (3)
1. An intelligent defrosting control method based on a mechanical balance principle is characterized in that the intelligent defrosting control system is composed of a mechanical balance system, a distance measuring system and an enclosure system;
the mechanical balance system is composed of an L-shaped air pipe 7, a circular diaphragm 3, a flexible connection 4, a spring 9 and the like; the opening end of the L-shaped air pipe 7 is horizontally arranged between the two parallel aluminum fins 1 of the evaporator, and cold air can enter the L-shaped air pipe 7 from the bell mouth under the action of the fan 5; the lower end of the circular diaphragm 3 is connected with an L-shaped air pipe 7 through a flexible connection 4, the flexible connection 4 is made of flexible plastics or canvas and can be freely stretched and contracted, and the circular diaphragm can be guaranteed to freely move within the elastic force variation range; the spring 9 is connected with the upper end of the circular diaphragm 3 and the aluminum fin 1, and a mechanical balance system of the control system is fixed through the fixing piece 6.
2. The distance measuring system consists of a laser distance measuring instrument 8 and a circular diaphragm 3; the laser range finder 8 is arranged on the fin 1 near the spring 9, and the laser range finder 8 can emit laser to the circular membrane 3 for measuring the distance between the circular membrane 3 and the fin 1.
3. The enclosure system 2 is made of materials such as polyurethane foam plastics or self-extinguishing polystyrene foam plastics and can be used for closing a mechanical balance system and a distance measuring system (except for an L-shaped air pipe opening); the enclosure system 2 can not only avoid the influence of wind speed on the stress and accurate distance measurement of the circular diaphragm 3, but also effectively prevent the occurrence of the phenomenon of mistaken defrosting of the heat pump system when foreign matters or a large amount of dust exist on the surface of the fin 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010496317.4A CN113758070A (en) | 2020-06-03 | 2020-06-03 | Intelligent defrosting control method based on mechanical balance principle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010496317.4A CN113758070A (en) | 2020-06-03 | 2020-06-03 | Intelligent defrosting control method based on mechanical balance principle |
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| Publication Number | Publication Date |
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| CN113758070A true CN113758070A (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010496317.4A Pending CN113758070A (en) | 2020-06-03 | 2020-06-03 | Intelligent defrosting control method based on mechanical balance principle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688683A (en) * | 2022-03-15 | 2022-07-01 | 青岛海尔空调器有限总公司 | Air conditioner and defrosting control method thereof |
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2020
- 2020-06-03 CN CN202010496317.4A patent/CN113758070A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688683A (en) * | 2022-03-15 | 2022-07-01 | 青岛海尔空调器有限总公司 | Air conditioner and defrosting control method thereof |
| CN114688683B (en) * | 2022-03-15 | 2024-05-24 | 青岛海尔空调器有限总公司 | Air conditioner and defrosting control method thereof |
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Application publication date: 20211207 |