CN114484910A - Bypass heating defrosting device, defrosting control method, refrigerating system and equipment - Google Patents
Bypass heating defrosting device, defrosting control method, refrigerating system and equipment Download PDFInfo
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- CN114484910A CN114484910A CN202210048385.3A CN202210048385A CN114484910A CN 114484910 A CN114484910 A CN 114484910A CN 202210048385 A CN202210048385 A CN 202210048385A CN 114484910 A CN114484910 A CN 114484910A
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- 238000010257 thawing Methods 0.000 title claims abstract description 232
- 238000010438 heat treatment Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005057 refrigeration Methods 0.000 claims abstract description 100
- 239000003507 refrigerant Substances 0.000 claims abstract description 37
- 230000002441 reversible effect Effects 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 7
- 238000000859 sublimation Methods 0.000 claims description 5
- 230000008022 sublimation Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 3
- 238000000638 solvent extraction Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 168
- 238000001816 cooling Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000009920 food preservation Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005092 sublimation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The invention discloses a bypass heating defrosting device, a defrosting control method, a refrigerating system and equipment, wherein the bypass heating defrosting device comprises: the evaporator assembly is arranged in the refrigeration system and provided with at least two evaporators arranged in parallel, after any evaporator in the evaporator assembly enters a defrosting mode to serve as a defrosting evaporator, at least one evaporator in the rest evaporators enters a refrigeration mode to serve as a refrigeration evaporator; each evaporator is independently provided with a bypass branch, the bypass branch is connected with an exhaust port of a compressor of the refrigeration system or an outlet of a condenser, and a refrigerant introduced through the bypass branch heats the defrosting evaporator. Each evaporator is provided with a forward and reverse rotating fan, and when the fan for starting the defrosting evaporator rotates reversely, part of airflow sent by the refrigerating evaporator enters an independent cavity where the defrosting evaporator is located. The invention has the advantages of small heat loss, high defrosting efficiency, low influence on a refrigerating system and the like, and is suitable for being applied to refrigerating equipment such as a refrigerator and the like.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a bypass heating defrosting device, a defrosting control method, a refrigeration system and refrigeration equipment.
Background
With the increasing standard of living, the refrigeration equipment is gradually applied to daily life, such as refrigerators and the like, and the refrigeration system of the refrigerator is mainly divided into four parts: the air conditioner comprises an evaporator, a condenser, a compressor and a throttling device, wherein the evaporator is a device for providing cold energy, and a refrigerant absorbs heat in the evaporator and evaporates to reduce the air temperature. Since the evaporator temperature is lower than the air dew point temperature, moisture in the air is continuously condensed into frost on the evaporator. When the amount of frost increases, the heat transfer efficiency of the evaporator deteriorates, the refrigeration effect deteriorates, and the energy consumption increases.
The traditional refrigerator adopts a single evaporator, so that a compressor needs to be stopped during defrosting, the temperature rise of a compartment is high, and the storage of food is not favorable. In addition, most of the refrigerators in the market at present are air-cooled refrigerators, and although the air-cooled refrigerators have an automatic defrosting function, most of the air-cooled refrigerators adopt an electric heating defrosting mode, wherein an electric heating pipe is arranged below an evaporator, and a frost layer is heated in an air heating mode. Because the defrosting mode is to heat the frost layer by the natural convection of air, the defrosting efficiency is low and the defrosting time is long.
The defrosting mode capable of improving the defrosting efficiency has appeared in the prior art, the electric heating net is used for providing heat for sublimation defrosting, and the vibration defrosting mode is combined to shake off a loose frost layer on the evaporator, but the vibration defrosting mode can influence the stability of an evaporator pipeline interface, and the resonance phenomenon can occur, so that the reliability of a refrigeration system is reduced.
Disclosure of Invention
In order to solve the problems of compartment temperature rise and low efficiency caused by the existing defrosting mode, the invention provides a bypass heating defrosting device, a defrosting control method, a refrigerating system and equipment.
The technical scheme adopted by the invention is that the bypass heating defrosting device is designed, and comprises: the evaporator assembly is arranged in the refrigeration system and provided with at least two evaporators arranged in parallel, after any evaporator in the evaporator assembly enters a defrosting mode to serve as a defrosting evaporator, at least one evaporator in the rest evaporators enters a refrigeration mode to serve as a refrigeration evaporator; each evaporator is independently provided with a bypass branch for providing sublimation heat of a frost layer, the bypass branch is connected with a compressor exhaust port or a condenser outlet of the refrigeration system, and a refrigerant is introduced to heat the defrosting evaporator when the bypass branch is connected.
Furthermore, the bypass branch is provided with a flow limiting pipeline and/or a flow limiting valve, when the bypass branch is communicated, the flow of the refrigerant entering the bypass branch is smaller than that of the refrigerant entering the refrigeration evaporator, and the refrigerant flowing out of the defrosting evaporator and the refrigeration evaporator is mixed and then flows to a compressor suction port of the refrigeration system.
Further, the bypass heating defroster further includes: the partition plate divides the area where the evaporator is located into independent chambers; each evaporator is provided with a forward and reverse rotating fan, and when the fan for starting the defrosting evaporator rotates reversely, part of airflow sent by the refrigerating evaporator enters an independent cavity where the defrosting evaporator is located. The evaporator entering the defrosting mode is a defrosting evaporator, and the evaporator entering the refrigerating mode is a refrigerating evaporator.
Furthermore, each independent cavity is provided with an air supply air inlet, an air supply air outlet and a defrosting air outlet, an air supply air channel is formed between the air supply air inlet and the air supply air outlet, a defrosting air channel is formed between the air supply air outlet and the defrosting air outlet, and the on-off states of the air supply air channel and the defrosting air channel are adjusted through valves.
Furthermore, the air supply air inlet, the air supply air outlet and the defrosting air outlet are all provided with valves, all the valves can be automatically reset and closed, and the valves of the air supply air outlet are provided with drainage holes. When the fan of the evaporator rotates forwards, the valve of the air supply inlet and the valve of the air supply outlet are blown open; when the fan of the evaporator rotates reversely, the valve of the defrosting air outlet is blown open, and the airflow enters the independent chamber from the drainage hole.
Furthermore, the defrosting air outlet is arranged at the bottom of the independent cavity, a water receiving disc is arranged below the defrosting air outlet and is used for receiving liquid and/or frost layers falling from the defrosting air outlet. The appearance of water collector is the infundibulate, and the top of water collector is equipped with the uncovered that is located all defrosting air outlets below, and the bottom of water collector is equipped with the size and is less than open outlet, and the below of outlet is equipped with the water collector.
Further, the bypass heating defroster further includes: the detection module is used for detecting the operating parameters of the evaporator, and the controller adjusts the operating state of the evaporator according to the operating parameters of the evaporator.
The detection module comprises at least one of an air speed sensor, a temperature sensor and a timer, wherein the air speed sensor is used for detecting the air speed of the corresponding air outlet after a fan of the evaporator is started, the temperature sensor is used for detecting the surface temperature T1 of the evaporator after the evaporator enters a defrosting mode, and the timer is used for timing the defrosting time T1 from zero when the evaporator enters the defrosting mode and/or timing the reversal time T2 from zero when the fan of the evaporator is started to reverse.
The invention also provides a defrosting control method realized by the bypass heating defrosting device, which comprises the following steps:
starting any evaporator to enter a refrigeration mode to serve as a refrigeration evaporator, and judging whether the refrigeration evaporator meets defrosting conditions in real time;
and if so, controlling the refrigeration evaporator to enter a defrosting mode to serve as the defrosting evaporator, introducing a refrigerant to heat the defrosting evaporator through a bypass branch of the defrosting evaporator, and simultaneously controlling at least one of the remaining evaporators to enter the refrigeration mode to serve as the refrigeration evaporator.
Wherein, judge in real time whether refrigeration evaporator satisfies the defrosting condition and include:
detecting the air supply and air outlet speed V1 of the refrigeration evaporator;
judging whether the air supply and air outlet speed V1 is less than a first set air speed V01;
if yes, the defrosting condition is met;
if not, the wind speed is returned to the detected wind speed V1.
Further, the defrosting control method further includes:
timing a defrost time T1 from zero when the refrigeration evaporator enters a defrost mode as a defrost evaporator;
detecting the surface temperature T1 and the defrosting time T1 of the defrosting evaporator;
judging whether the surface temperature T1 is greater than the set temperature T01 or whether the defrosting time T1 is greater than a first set time T01;
if so, starting a fan of the defrosting evaporator to reversely rotate;
if not, the detection surface temperature T1 and the defrosting time T1 are returned.
Further, the defrosting control method further includes:
counting a reverse time T2 from zero when a fan of the defrosting evaporator is started to reversely rotate;
detecting a defrosting air outlet speed V2 and a reverse rotation time T2 of the defrosting evaporator;
judging whether the defrosting air outlet speed V2 is greater than a second set air speed V02 or whether the reverse rotation time T2 is greater than a second set time T02;
if so, the defrosting evaporator exits the defrosting mode, and a bypass branch and a fan of the defrosting evaporator are closed;
if not, the defrosting air outlet speed V2 and the reverse rotation time T2 are detected.
The invention also provides a refrigeration system adopting the bypass heating defrosting device, which comprises: the compressor, the condenser, the throttling device and the evaporator assembly are connected in sequence. In some embodiments, the evaporator assembly has two evaporators, and the throttling device is connected to the evaporator assembly by a three-way valve, and the three-way valve can be switched to connect the throttling device to any one evaporator in the evaporator assembly.
The invention also provides refrigeration equipment with the refrigeration system, and the refrigeration equipment can be products such as a refrigerator and the like.
Compared with the prior art, the invention has the following beneficial effects:
1. after the evaporators enter a defrosting mode, at least one evaporator enters a refrigerating mode, a bypass branch of the defrosting evaporator is connected, high-temperature refrigerant discharged by a compressor or flowing out of a condenser is introduced, and the high-temperature refrigerant is directly heated from the interior of the evaporator, so that the temperature of the defrosting evaporator is increased, and compared with electric heating defrosting, the heat loss is small and the energy consumption is low;
2. the bypass branch is subjected to a current-limiting design, a small amount of high-temperature refrigerants are introduced to slightly raise the temperature of the defrosting evaporator, so that a frost layer on the evaporator is sublimated, and the introduced refrigerants have low influence on a refrigeration system and small temperature fluctuation of the room temperature;
3. in the defrosting process, a fan of the defrosting evaporator is started to rotate reversely, partial airflow flowing out of the refrigerating evaporator is led into an independent cavity where the defrosting evaporator is located, low-humidity air is continuously provided for the defrosting evaporator, the humidity increase caused by sublimation of a frost layer is avoided, and the maximum humidity difference is continuously provided so as to maintain the maximum speed of sublimation of the frost layer;
4. the compressor does not need to be stopped in the defrosting process, so that the frequency of frequently starting and stopping the compressor is reduced, the service life of the compressor is prolonged, and the operation reliability of a refrigerating system is improved;
5. the area where the evaporator is located is separated by the partition board, the air supply of the refrigeration evaporator is not interfered by the defrosting evaporator, the air volume introduced when the defrosting evaporator rotates reversely is small, the temperature of the compartment of refrigeration equipment such as a refrigerator is basically unchanged, and the food preservation effect is good.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic diagram of a dual evaporator refrigeration system of the present invention;
FIG. 2 is a schematic view of the valves of the defrosting evaporator of the present invention with the fan reversed;
FIG. 3 is a schematic view of the valves at the end of defrosting of the defrosting evaporator of the present invention;
FIG. 4 is a schematic view showing the control of the alternate operation of the dual evaporators in the present invention;
FIG. 5 is a schematic flow diagram of the defrost control method of the present invention;
wherein, 1, a compressor; 2, a condenser; 3, a throttle valve; 4 a first evaporator; 5 a second evaporator; 6 electromagnetic three-way valve; 7, a one-way valve; 8 a first solenoid valve; 9 a second solenoid valve; 10 a first fan; 11 a second fan; 12, a water pan; 13, a water receiving box; 14 a partition plate; 15 a first air supply and outlet valve; 16 a second air supply and outlet valve; 17 a first air supply air inlet valve; 18 a second air supply air inlet valve; 19 a first defrosting air outlet valve; 20 second defrosting air outlet valve.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the bypass heating defrosting device provided by the invention is suitable for a refrigeration system, the refrigeration system mainly comprises four parts, namely a compressor 1, a condenser 2, a throttling device 3 and an evaporator assembly which are sequentially connected, a refrigerant is discharged from an exhaust port of the compressor 1 during refrigeration, and flows back to an air suction port of the compressor 1 after passing through the condenser 2, the throttling device 3 and the evaporator assembly, the bypass heating defrosting device is an improved scheme provided for the evaporator assembly, and the specific structure is as follows.
The bypass heating defrosting device includes: the evaporator assembly is arranged in a refrigeration system and provided with at least two evaporators arranged in parallel, a check valve 7 allowing only a refrigerant to flow out is installed at an outlet of each evaporator, after any one evaporator in the evaporator assembly enters a defrosting mode, at least one evaporator in the rest evaporators enters a refrigeration mode, in order to distinguish the evaporators in different working modes, the evaporator entering the defrosting mode is called a defrosting evaporator, the evaporator entering the refrigeration mode is called a refrigeration evaporator, and the evaporator adjacent to the defrosting evaporator is preferentially selected to perform the refrigeration mode, so that a humidity difference is generated between the defrosting evaporator and the refrigeration evaporator. Each evaporator in the evaporator assembly is independently provided with a bypass branch, the bypass branch is connected with an exhaust port of a compressor 1 or an outlet of a condenser 2 of a refrigeration system, the bypass branch is provided with an electromagnetic valve for switching the on-off state of the bypass branch, when the bypass branch is connected, all refrigerants in the defrosting evaporator are provided by the bypass branch, the bypass branch refers to high-temperature refrigerants flowing out of the compressor or the condenser, the refrigerants are directly heated from the inside of the defrosting evaporator, the temperature of the defrosting evaporator is increased, a frost layer attached to the defrosting evaporator is sublimated, the heat loss is small, and the energy consumption is low.
Because the frost layer of subliming compares in the frost layer that condenses on whole defrosting evaporator, only accounts for the fractional part, therefore the sublimation process of defrosting evaporator need introduce the high temperature refrigerant volume not big, and is limited to the system influence, and the compressor need not to shut down in the defrosting process, reduces the compressor and frequently opens and stops the number of times, extension compressor life, increases refrigerating system's operational reliability. In order to limit the flow of the refrigerant entering the defrosting evaporator, the bypass branch is subjected to flow limiting design.
In an embodiment of the invention, the bypass branch is provided with a flow-limiting pipeline, the diameter of the flow-limiting pipeline is small, the flow of the refrigerant when the bypass branch is connected is effectively limited, so that the flow of the refrigerant entering the bypass branch is smaller than that of the refrigerant entering the refrigeration evaporator, the refrigerant flowing out of the defrosting evaporator and the refrigeration evaporator flows to an air suction port of a compressor 1 of the refrigeration system after being mixed, the influence on the refrigeration system is low, and the temperature fluctuation of the compartment is small.
In another embodiment of the invention, the bypass branch is provided with a flow limiting valve, the flow of the refrigerant when the bypass branch is connected is limited by the flow limiting valve, so that the flow of the refrigerant entering the bypass branch is smaller than the flow of the refrigerant entering the refrigeration evaporator, the refrigerant flowing out of the defrosting evaporator and the refrigeration evaporator flows to a suction port of a compressor 1 of the refrigeration system after being mixed, the influence on the refrigeration system is low, and the temperature fluctuation of the room temperature is small.
It should be understood that, in practical applications, the bypass branch may also be provided with a flow restriction line and a flow restriction valve at the same time, so as to more reliably restrict the refrigerant flow of the bypass branch. In the defrosting process, the bypass branch can be also intermittently communicated, and the refrigerant flow of the bypass branch can be limited by the intermittent communication.
In order to improve defrosting efficiency, in another embodiment of the invention, each evaporator in the evaporator assembly is arranged in a separated mode, two adjacent evaporators are separated by a partition plate 14, the area where the evaporator is located is separated into independent chambers by the partition plate 14, and air supply of the refrigeration evaporator is not interfered by the defrosting evaporator. Every evaporimeter all disposes the fan that can switch corotation or reversal, and when the fan reversal of opening the defrosting evaporimeter, the partial air current that the refrigeration evaporimeter sent gets into the independent cavity at defrosting evaporimeter place to reduce humidity in the independent cavity and disturbance attached to the frost layer on the evaporimeter, the advantage of reversal drainage is that the humidity difference in maintaining the independent cavity at defrosting evaporimeter place is sublimed with higher speed, makes the evaporimeter rise the not hard up frost layer of back of china and drops.
Each independent cavity is provided with an air supply air inlet, an air supply air outlet and a defrosting air outlet, an air supply air channel is formed between the air supply air inlet and the air supply air outlet, a defrosting air channel is formed between the air supply air outlet and the defrosting air outlet, and the on-off states of the air supply air channel and the defrosting air channel are adjusted through valves. The air supply duct of the refrigeration evaporator is communicated, the defrosting duct is closed, the air supply duct of the defrosting evaporator is closed, and the defrosting duct is communicated after entering a defrosting mode for a period of time.
In some embodiments of the present invention, the defrosting outlet is disposed at the bottom of the independent chamber, a water pan 12 is disposed below the defrosting outlet, and the water pan 12 is used for receiving liquid and frost layer falling from the defrosting outlet. In order to better collect frost layers and enable the bypass heating defrosting device to be compact in structure, all evaporators share one water receiving tray 12, the water receiving tray 12 is funnel-shaped, an opening is formed in the top of the water receiving tray 12, all defrosting air outlets are located above the opening, a water outlet smaller than the opening in size is formed in the bottom of the water receiving tray 12, a water receiving box 13 is arranged below the water outlet, part of falling frost layers slide down from the water receiving tray 12 and are collected in the water receiving box 13, and most of the rest frost layers are sent to the external environment along with air through a compressor chamber where a compressor 1 is located.
Particularly, the air supply air inlet, the air supply air outlet and the defrosting air outlet are all provided with valves, all the valves can be automatically reset and closed, the automatic reset and closing at the positions means that the air outlets where the valves are located are closed due to automatic resetting of the valves under the action of no external force, the valves at the air supply air outlet are provided with drainage holes with small sizes, and the drainage holes are used for enabling air flow to still enter the independent cavities through the drainage holes after the valves at the air supply air outlet are automatically reset and closed. When the fan of the evaporator rotates forwards, the valve of the air supply inlet and the valve of the air supply outlet are blown open, and the valve of the defrosting outlet is automatically reset and closed; when the fan of the evaporator rotates reversely, the valve of the defrosting air outlet is blown open, the airflow enters the independent cavity from the drainage hole, the introduced air volume is small, the influence on the refrigeration effect is low, the temperature of the compartment is basically unchanged, and the food preservation effect is good.
It should be noted that the fan of the refrigeration evaporator is operated in a forward rotation mode after being started, the fan is stopped when the refrigeration evaporator enters a defrosting mode, and the fan of the defrosting evaporator is operated in a reverse rotation mode after being started, that is, the fan of the defrosting evaporator is in a stopped operation state at the initial stage of defrosting and in a reverse rotation operation state at the later stage of defrosting. The automatic resetting and closing of the valve can be realized by various means, two examples are provided below for illustration, and in practical application, the present invention is not limited to a specific installation structure of the valve.
In one embodiment of the invention, all the valves are automatically reset and closed under the action of gravity, taking the valve of a defrosting air outlet as an example, the valve is hinged at the air outlet corresponding to the valve, a baffle ring abutting against the valve is arranged in the air outlet, the valve is eccentrically designed, the hinged shaft is taken as a boundary line, the weight of the valve positioned at two sides of the hinged shaft is different, the heavy side provides a restoring force for automatically resetting and closing, when the fan rotates, the air flow pushes the light side to rotate in the forward direction to open the valve, and after the fan stops rotating, the heavy side pushes the light side to rotate in the reverse direction under the action of gravity until the valve abuts against the baffle ring, so that the automatic resetting and closing of the valve are completed.
In another embodiment of the invention, all the valves are automatically reset under the action of the elastic element, taking the valve of the air supply inlet as an example, the valve is hinged at the corresponding air inlet, a stop ring which is abutted against the valve is arranged in the air inlet, the hinged shaft is sleeved with the elastic element such as a torsional spring and the like, the torsional spring provides restoring force for automatic reset closing, when the fan rotates, the air flow pushes the valve to rotate in the forward direction to open the valve, the torsional spring deforms along with the rotation of the valve, and after the fan stops rotating, the torsional spring pushes the valve to rotate in the reverse direction under the restoring force until the valve is abutted against the stop ring, so that the automatic reset closing of the valve is completed.
For better understanding of the present invention, the structure of the bypass defrosting apparatus will be described in detail below by taking an example in which the evaporator assembly has two evaporators arranged in parallel.
As shown in fig. 1, two evaporators of the evaporator assembly are a first evaporator 4 and a second evaporator 5, respectively, a fan of the first evaporator 4 is a first fan 10, a fan of the second evaporator 5 is a second fan 11, the first evaporator 4 and the second evaporator 5 are connected in parallel through an electromagnetic three-way valve 6 and a check valve 7, a port a1 of the electromagnetic three-way valve 6 is connected with an outlet of the throttling device 3, a port B1 is connected with an inlet of the first evaporator 4, and a port C1 is connected with an inlet of the second evaporator 5.
The first evaporator 4 and the second evaporator 5 can alternately provide cooling for the compartment, when the flow path A1-B1 is connected, the first evaporator 4 provides cooling for the compartment, the second evaporator 5 does not provide cooling, when the flow path A1-C1 is connected, the second evaporator 5 provides cooling for the compartment, and the first evaporator 4 does not provide cooling.
The first evaporator 4 is connected with a first bypass branch, a first electromagnetic valve 8 is installed on the first bypass branch, the second evaporator 5 is connected with a second bypass branch, and a second electromagnetic valve 9 is installed on the second bypass branch. The inlet of the first bypass branch is connected between the exhaust port of the compressor 1 and the inlet of the condenser 2, and the outlet of the first bypass branch is connected between the inlet of the first evaporator 4 and the outlet of B1 of the electromagnetic three-way valve 6. The inlet of the second bypass branch is connected between the exhaust port of the compressor 1 and the inlet of the condenser 2, and the outlet of the second bypass branch is connected between the inlet of the second evaporator 5 and the outlet of the C1 of the electromagnetic three-way valve 6.
As shown in fig. 2 and 3, the two evaporators are separated into independent chambers by a partition plate 14, and the first fan 10 and the second fan 11 are controlled by the motor to rotate forward and backward for bidirectional blowing. The air supply air inlet of the independent cavity where the first evaporator 4 is located is provided with a first air supply air inlet valve 17, the air supply air outlet is provided with a first air supply air outlet valve 15, the defrosting air outlet is provided with a first defrosting air outlet valve 19, the air supply air inlet of the independent cavity where the second evaporator 5 is located is provided with a second air supply air inlet valve 18, the air supply air outlet is provided with a second air supply air outlet valve 16, and the defrosting air outlet is provided with a second defrosting air outlet valve 20.
When the first evaporator 4 is a refrigeration evaporator, the first fan 10 rotates forward, the first air supply inlet valve 17 and the first air supply outlet valve 15 are opened along with the air flow of the fan, the low-temperature air passing through the first evaporator 4 is conveyed into the compartment, and the first defrosting outlet valve 19 is closed. When the second evaporator 5 is a defrosting evaporator, the second fan 11 is turned back after being turned on, the second defrosting air outlet valve 20 is opened along with the fan airflow, the air after the frost layer is sublimated is discharged to the outside through the water receiving tray 12 and the compressor chamber, and the second air supply air inlet valve 18 and the second air supply air outlet valve 16 are closed.
In order to realize the automatic control of the bypass heating defrosting device, the bypass heating defrosting device further comprises: the detection module is used for detecting the operating parameters of the evaporator, and the controller adjusts the operating state of the evaporator according to the operating parameters of the evaporator. Generally, the detection module includes at least one of an air speed sensor for detecting an air speed of the corresponding outlet port after a fan of the evaporator is activated, a temperature sensor for detecting a surface temperature T1 of the evaporator after the evaporator enters a defrost mode, and a timer for counting a defrost time T1 from zero when the evaporator enters the defrost mode or a reverse time T2 from zero when the fan of the evaporator is turned on in reverse, and in some embodiments, the timer is for counting a defrost time T1 and a reverse time T2.
The number of the wind speed sensors, the temperature sensors, and the timers is not limited, and for example, one or two or more temperature sensors may be designed to simultaneously detect the surface temperature t1 of the same evaporator, and the average value of the detected temperatures, the maximum value of the detected temperatures, or the minimum value of the detected temperatures may be taken. For example, one timer may be designed to time the defrosting time T1, another timer may be designed to time the inversion time T2, or the same timer may be used to time the defrosting time T1 and the inversion time T2.
As shown in fig. 4, the defrosting control method performed by the controller is as follows:
starting any evaporator to enter a refrigeration mode to serve as a refrigeration evaporator;
detecting the current running condition of the refrigeration evaporator;
judging whether the refrigeration evaporator meets the defrosting condition in real time;
if not, returning to detect the current operation state of the refrigeration evaporator;
if so, controlling the refrigeration evaporator to enter a defrosting mode, stopping a fan of the refrigeration evaporator, switching the refrigeration evaporator into the defrosting evaporator, introducing a refrigerant to heat the defrosting evaporator through a bypass branch of the defrosting evaporator, controlling at least one of the remaining evaporators to enter the refrigeration mode as the refrigeration evaporator, and then executing the following steps;
timing a defrost time T1 from zero when the refrigeration evaporator enters the defrost mode as a defrost evaporator;
detecting the surface temperature T1 and the defrosting time T1 of the defrosting evaporator;
judging whether the surface temperature T1 is greater than the set temperature T01 or whether the defrosting time T1 is greater than a first set time T01;
if not, returning to detect the surface temperature T1 and the defrosting time T1;
if so, sublimating a frost layer attached to the surface of the defrosting evaporator, gradually softening the frost layer, starting a fan of the defrosting evaporator to reversely rotate, and then executing the following steps;
counting a reverse time T2 from zero when a fan of the defrosting evaporator is started to reversely rotate;
detecting a defrosting air outlet speed V2 and a reverse rotation time T2 of the defrosting evaporator;
judging whether the defrosting air outlet speed V2 is greater than a second set air speed V02 or whether the reverse rotation time T2 is greater than a second set time T02;
if so, indicating that the frost layer attached to the surface of the defrosting evaporator is completely removed, exiting the defrosting mode of the defrosting evaporator, and closing a bypass branch and a fan of the defrosting evaporator;
if not, the defrosting air outlet speed V2 and the reverse rotation time T2 are detected.
In an embodiment of the present invention, the supply air-out speed V1 of the refrigeration evaporator is used to determine whether a defrosting condition is satisfied, if the supply air-out speed V1 is less than the first set air speed V01, it indicates that the frost layer attached to the surface of the evaporator is thick, the air flow is blocked, and the defrosting condition is satisfied, and if the supply air-out speed V1 is not less than the first set air speed V01, it indicates that the surface of the evaporator is not frosted or the frost layer is thin, the air flow is relatively smooth, and the defrosting condition is not satisfied. Of course, the defrosting condition may be determined by any one of the determination conditions in the prior art, and the present invention is not limited thereto.
In the above description, the air supply outlet air speed V1 is detected by an air speed sensor attached to the air supply outlet, the defrosting outlet air speed V2 is detected by an air speed sensor attached to the defrosting outlet, and the surface temperature t1 of the defrosting evaporator is detected by a temperature sensor attached to the evaporator. The set temperature T01, the first set wind speed V01, the first set time T01, the second set wind speed V02 and the second set time T02 can be designed according to practical applications.
As shown in fig. 5, for better understanding of the present invention, the following description will still detail the defrosting control method by taking an example in which the evaporator assembly has two evaporators arranged in parallel. In the refrigeration process of the refrigeration equipment, whether the current refrigeration evaporator meets the defrosting condition is judged, if yes, the current refrigeration evaporator is switched to be the defrosting evaporator, and the other evaporator is switched to be the refrigeration evaporator. Assuming that the first evaporator 4 is a refrigeration evaporator for cooling the compartment, the defrosting control method is as follows.
And (3) starting the first evaporator 4 for refrigeration, not refrigerating the second evaporator 5, starting a defrosting mode of the first evaporator 4 when detecting that the air supply outlet air speed V1 at the outlet of the first air supply outlet air valve 15 is lower than a first set air speed V0, controlling the electromagnetic three-way valve 6 to change a flow route A1-B1 into A1-C1, starting the first electromagnetic valve 8, and timing the defrosting time T1.
At this time, the first evaporator 4 enters a defrosting state, the temperature is slightly raised, and the frost layer on the first evaporator 4 is gradually sublimated by using the air with low original humidity around the first evaporator 4, so that the humidity of the air around the first evaporator 4 is high. The second evaporator 5 is brought into a cooling state and the ambient air humidity is low, so that there is always a humidity difference in the air between the first evaporator 4 and the second evaporator 5.
When the temperature t1 of the first evaporator 4 rises to the first preset temperature t0, the frost layer on the surface of the first evaporator 4 is sublimated and gradually becomes soft, and the first fan 10 can be turned on for reverse rotation. If the temperature of the first evaporator 4 does not reach the first preset temperature T0, but the defrosting time T1 reaches the first set time T01, which indicates that the first evaporator 4 has been heated for a while, the surface frost layer is sublimated, at this time, the first fan 10 may also be turned upside down, a part of the low humidity air sent out by the second evaporator 5 is introduced into the independent chamber where the first evaporator 4 is located, and the high temperature refrigerant introduced by the first bypass branch is added to continuously maintain the humidity difference and the temperature difference in the independent chamber where the first evaporator 4 is located, so that the frost layer on the first evaporator 4 is continuously sublimated, a part of the frost layer which may fall down slides down from the water receiving tray 12, and is collected in the water receiving box 13, and the rest is mostly sent to the large environment along with the air through the compressor chamber.
When it is detected that the defrosting air-out speed V2 at the outlet of the first defrosting air-out valve 19 is greater than the second set air speed V02 or the reverse rotation time T2 of the first fan 10 is greater than the second set time T02, it indicates that the frost layer on the first evaporator 4 is completely removed, the first electromagnetic valve 8 is closed, the first fan 10 is closed, the defrosting mode exits, and the first defrosting air-out valve 19 automatically resets and closes after the first fan 10 is closed.
In summary, the bypass heating defrosting device provided by the invention has the advantages of small heat loss, high defrosting efficiency, low influence on a refrigerating system, small temperature fluctuation of the compartment and the like, is suitable for being applied to refrigerating equipment such as a refrigerator and the like, and has stable temperature of the compartment and good food preservation effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (17)
1. Bypass heating defroster includes: the evaporator assembly is arranged in the refrigeration system and provided with at least two evaporators arranged in parallel, after any evaporator in the evaporator assembly enters a defrosting mode to serve as a defrosting evaporator, at least one evaporator in the rest evaporators enters a refrigeration mode to serve as a refrigeration evaporator;
the defrosting evaporator is characterized in that each evaporator is independently provided with a bypass branch for providing sublimation heat of a frost layer, the bypass branch is connected with a compressor exhaust port or a condenser outlet of the refrigerating system, and a refrigerant is introduced to heat the defrosting evaporator when the bypass branch is connected.
2. The bypass heating defroster according to claim 1, wherein the bypass branch is provided with a restriction pipe and/or a restriction valve; when the bypass branch is connected, the flow rate of the refrigerant entering the bypass branch is smaller than that of the refrigerant entering the refrigeration evaporator, and the refrigerant flowing out of the defrosting evaporator and the refrigerant flowing out of the refrigeration evaporator are mixed and then flow to a compressor air suction port of the refrigeration system.
3. The bypass heating defroster of claim 1 further comprising: the partition plate is used for partitioning the area where the evaporator is located into independent chambers; each evaporator is provided with a forward and reverse rotating fan, and when the fan of the defrosting evaporator is started to rotate reversely, part of airflow sent by the refrigerating evaporator enters an independent cavity where the defrosting evaporator is located.
4. The bypass heating defrosting device according to claim 3, wherein each of the independent chambers is provided with an air supply inlet, an air supply outlet and a defrosting outlet, an air supply duct is formed between the air supply inlet and the air supply outlet, a defrosting duct is formed between the air supply outlet and the defrosting outlet, and the on-off states of the air supply duct and the defrosting duct are adjusted by valves.
5. The bypass heating defrosting device according to claim 4, wherein the valves are disposed at the air supply inlet, the air supply outlet and the defrosting outlet, all of the valves can be automatically reset and closed, and a drainage hole is disposed at the valve of the air supply outlet;
when the fan of the evaporator rotates forwards, the valve of the air supply inlet and the valve of the air supply outlet are blown open;
when the fan of the evaporator rotates reversely, the valve of the defrosting air outlet is blown open, and airflow enters the independent chamber from the drainage hole.
6. The bypass heating defroster of claim 4 wherein the defroster outlet is located at the bottom of the independent chamber and a water pan is located below the defroster outlet for receiving a layer of liquid and/or frost from the defroster outlet.
7. The bypass heating defroster according to claim 6, wherein the water pan is funnel-shaped, the top of the water pan is provided with an opening below all the defrosting air outlets, the bottom of the water pan is provided with a water outlet smaller than the opening, and a water receiving box is arranged below the water outlet.
8. The bypass heating defroster according to any one of claims 1 to 7 further comprising: the detection module is used for detecting the operating parameters of the evaporator, and the controller adjusts the operating state of the evaporator according to the operating parameters of the evaporator.
9. The bypass heating defroster of claim 8 wherein the detection module comprises at least one of a wind speed sensor, a temperature sensor, and a timer;
the wind speed sensor is used for detecting the wind speed of the corresponding air outlet after a fan of the evaporator is started;
the temperature sensor is used for detecting the surface temperature t1 of the evaporator after the evaporator enters a defrosting mode;
the timer is used for timing a defrosting time T1 from zero when the evaporator enters a defrosting mode and/or a reversing time T2 from zero when a fan of the evaporator is turned on reversely.
10. A defrosting control method implemented by the bypass heating defrosting apparatus according to any one of claims 1 to 9, characterized in that the defrosting control method comprises:
starting any evaporator to enter a refrigeration mode to serve as a refrigeration evaporator, and judging whether the refrigeration evaporator meets defrosting conditions in real time;
and if so, controlling the refrigeration evaporator to enter a defrosting mode to serve as the defrosting evaporator, introducing a refrigerant to heat the defrosting evaporator through a bypass branch of the defrosting evaporator, and simultaneously controlling at least one of the rest evaporators to enter the refrigeration mode to serve as the refrigeration evaporator.
11. The defrost control method of claim 10, wherein determining in real time whether the refrigeration evaporator meets defrost conditions comprises:
detecting the air supply and air outlet speed V1 of the refrigeration evaporator;
judging whether the air supply and air outlet speed V1 is less than a first set air speed V01;
if yes, the defrosting condition is met;
if not, returning to detect the wind speed V1.
12. The defrost control method of claim 10, further comprising:
timing a defrost time T1 from zero when the refrigeration evaporator enters a defrost mode as a defrost evaporator;
detecting a surface temperature T1 of the defrost evaporator and the defrost time T1;
judging whether the surface temperature T1 is greater than a set temperature T01 or the defrosting time T1 is greater than a first set time T01;
if yes, starting a fan of the defrosting evaporator to reversely rotate;
if not, returning to detect the surface temperature T1 and the defrosting time T1.
13. The defrost control method of claim 12, further comprising:
starting to count a reverse time T2 from zero when a fan of the defrosting evaporator is started to reversely rotate;
detecting a defrosting air outlet speed V2 of the defrosting evaporator and the reverse rotation time T2;
judging whether the defrosting air outlet speed V2 is greater than a second set air speed V02 or the reverse rotation time T2 is greater than a second set time T02;
if so, the defrosting evaporator exits the defrosting mode, and a bypass branch and a fan of the defrosting evaporator are closed;
and if not, returning to detect the defrosting air outlet speed V2 and the reverse rotation time T2.
14. A refrigeration system, comprising: a compressor, a condenser, a throttling device and an evaporator assembly connected in series, wherein the refrigeration system employs the bypass heating defroster of any one of claims 1 to 9.
15. The refrigerant system as set forth in claim 14, wherein said evaporator assembly has two evaporators, said throttling means being connected to said evaporator assembly by a three-way valve, said three-way valve being switchable between said throttling means and either of said evaporators of said evaporator assembly.
16. Refrigeration device, characterized in that it has a refrigeration system according to claim 14 or 15.
17. The refrigeration appliance of claim 16 wherein the refrigeration appliance is a refrigerator.
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