WO2023284589A1 - Réfrigérateur - Google Patents

Réfrigérateur Download PDF

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Publication number
WO2023284589A1
WO2023284589A1 PCT/CN2022/103925 CN2022103925W WO2023284589A1 WO 2023284589 A1 WO2023284589 A1 WO 2023284589A1 CN 2022103925 W CN2022103925 W CN 2022103925W WO 2023284589 A1 WO2023284589 A1 WO 2023284589A1
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WO
WIPO (PCT)
Prior art keywords
evaporator
gas
refrigerator
defrosting
refrigerant
Prior art date
Application number
PCT/CN2022/103925
Other languages
English (en)
Chinese (zh)
Inventor
大木达也
和田芳彦
馆野恭也
Original Assignee
海尔智家股份有限公司
青岛海尔电冰箱有限公司
Aqua 株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 海尔智家股份有限公司, 青岛海尔电冰箱有限公司, Aqua 株式会社 filed Critical 海尔智家股份有限公司
Priority to CN202280049627.9A priority Critical patent/CN117751265A/zh
Publication of WO2023284589A1 publication Critical patent/WO2023284589A1/fr

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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
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/08—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation using ducts

Definitions

  • the present invention relates to a refrigerator, and more particularly to a refrigerator that removes frost adhering to an evaporator with a hot gaseous refrigerant.
  • the evaporator that constitutes a part of the cooling circuit of the refrigerator has frost formed due to the cooling of the surrounding water vapor, and there is a risk of lowering the cooling performance.
  • a hot gas bypass pipe connected to the upstream side of the evaporator is provided downstream of the compressor constituting a part of the cooling circuit, by means of which the high temperature gas temporarily flows through the evaporator so that the evaporator becomes
  • a hot gas defrosting process in which heat is used to defrost is known (for example, refer to Patent Document 1).
  • the evaporator is heated by directly supplying the hot gaseous refrigerant discharged from the compressor to the inlet of the heat exchange pipe of the evaporator to perform defrosting treatment.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2018-54287
  • An object of the present invention is to provide a refrigerator capable of efficiently defrosting an evaporator in a short time using a hot gaseous refrigerant.
  • the present invention provides a refrigerator comprising:
  • a cooling circuit in which a cooling cycle is implemented in which the refrigerant flows sequentially through the compressor, the condenser, the evaporator and returns to said compressor again;
  • a fan which is used to move the air in the refrigerator
  • the gas is circulated by the fan as follows: the gas passing through the evaporator flows into the refrigerating chamber from bottom to top, and the gas flowing in the refrigerating chamber returns to the lower side of the evaporator again,
  • the inlet and outlet of the heat exchange pipes of the evaporator for refrigerant flow are arranged on the upper side of the evaporator,
  • a first defrosting process is performed in which the refrigerant discharged from the compressor is supplied to the inlet of the heat exchange pipe through the hot gas bypass pipe, and at the same time the refrigerant flowing in the refrigerating chamber is also defrosted.
  • the gas is supplied to the underside of the evaporator for the gas defrosting process.
  • the temperature of the heat exchange pipe of the evaporator is low, so there is a risk that the refrigerant condenses and accumulates on the lower side of the evaporator.
  • the present invention by supplying the temperature-increased gas flowing in the refrigerating room to the lower side of the evaporator, it is possible to warm the lower side of the evaporator, suppress the condensation of the refrigerant, and prevent the refrigerant from accumulating on the lower side of the evaporator. . Accordingly, it is possible to provide a refrigerator capable of efficiently defrosting the evaporator in a short time using a hot gaseous refrigerant.
  • a second defrosting procedure is implemented, in which the Gas defrosting treatment, and only the hot gas defrosting treatment.
  • the gas defrosting process using the gas flowing in the refrigerator compartment continues, the temperature of the circulating gas rises, and there is a risk that the temperature in the refrigerator compartment rises.
  • the gas defrosting process is stopped, and only the hot gas defrosting process is performed. In this way, the defrosting process of the evaporator can be efficiently performed while suppressing the temperature rise of the refrigerator compartment.
  • the refrigerator also includes:
  • a switching valve that switches between an open state in which refrigerant discharged from the compressor flows to the hot gas bypass pipe side to perform the hot gas defrosting process, and a closed state in which the closed state , the refrigerant discharged from the compressor flows to the side of the condenser to perform normal operations;
  • the damper of the refrigerating room is switched between an open state in which gas flows from the cooling flow path provided with the evaporator to the refrigerating room, and a closed state in which gas does not flow from the cooling channel provided with the evaporator.
  • the cooling flow path flows to the refrigerator compartment;
  • control section for controlling the compressor, the fan, the switching valve, and the refrigerating compartment damper
  • the control part starts the first defrosting process by opening the switching valve while the compressor is turned on, and simultaneously opening the refrigerating compartment damper while the fan is turned on, When a predetermined time elapses or when a temperature of air flowing in the refrigerating chamber reaches a preset temperature, the first defrosting procedure is switched to the second defrosting procedure by closing at least the refrigerating chamber damper.
  • the first defrosting course and the second defrosting course can be reliably performed by controlling the compressor, the fan, the switching valve, and the refrigerator compartment damper by the controller.
  • control unit switches from the first defrosting program to the second defrosting program based on timing data of a timer or measurement data of a temperature sensor provided in the refrigerator compartment.
  • switching from the first defrosting routine to the second defrosting routine can be performed at an accurate timing.
  • the refrigerator further includes a freezer compartment and a freezer damper switchable between an open state and a closed state.
  • the open state gas flows from the cooling flow path to the freezer compartment.
  • the control unit maintains the freezing compartment damper in a closed state during the execution of the first defrosting process and the second defrosting process.
  • the beneficial effects of the present invention are: the refrigerator of the present invention can efficiently defrost the evaporator in a short time by using the hot gas refrigerant.
  • Fig. 1 is a side sectional view of the refrigerator of the present invention.
  • Fig. 2 is a block diagram showing the configuration of the cooling circuit of the refrigerator of the present invention.
  • Fig. 3 is a diagram of piping near an evaporator in the refrigerator of the present invention.
  • Fig. 4 is a block diagram of a control system associated with defrosting of the refrigerator of the present invention.
  • Fig. 5A is a control timing chart when hot gas defrosting processing and gas defrosting processing are performed.
  • Fig. 5B is a control time chart when only the hot gas defrosting process is performed.
  • Fig. 1 is a side sectional view of a refrigerator 1 of the present invention. First, the outline of the refrigerator 1 of the present invention will be described with reference to FIG. 1 .
  • Refrigerator 1 has casing 2 , and the front portion of casing 2 includes an upper door 3 and a lower door 4 rotatably mounted in a state placed on a horizontal floor.
  • the inside of the housing 2 (hereinafter referred to as “inside the refrigerator”) is provided with a freezer compartment 6 and a refrigerator compartment 7 .
  • a heat insulating material is arranged between the inner surface of the shell 2 and the outer surfaces of the freezing chamber 6 and the refrigerating chamber 7 .
  • a cooling flow path 10 consisting of a lower cooling flow path 10A and an upper cooling flow path 10B separated by partition plates 11A, 11B, respectively.
  • the cooling flow path 10 (to be precise, the lower side cooling flow path 10A) is provided with an evaporator (evaporator) 24 .
  • the evaporator 24 constitutes a part of the cooling circuit 20 of the refrigerator 1 as will be described later.
  • a fan 12 is provided above the evaporator 24 in the cooling flow path 10 .
  • the air in the refrigerator can be circulated by the fan 12 , and the air cooled by the evaporator 24 can be supplied to the freezer compartment 6 or the refrigerator compartment 7 from the cooling flow path 10 .
  • a freezer compartment damper 13 is provided at an upper opening of the lower partition plate 11A.
  • the gas passing through evaporator 24 flows from cooling flow path 10 (lower side cooling flow path 10A) to freezer compartment 6 .
  • the closed state of freezer compartment damper 13 the gas passing through evaporator 24 is prevented from flowing from cooling flow path 10 (lower side cooling flow path 10A) to freezer compartment 6 .
  • the freezer door 13 is in a closed state.
  • the fan 12 When the freezer door 13 is opened, the fan 12 is driven so that the air flowing into the freezer 6 from the cooling flow path 10 (lower cooling flow path 10A) circulates in the freezer 6 and flows from the bottom of the lower partition plate 11A.
  • the side opening returns to the cooling flow path 10 (lower side cooling flow path 10A). In this way, the gas is cooled again by passing through the evaporator 24 to repeat the same flow cycle. In this way, the stored goods in the freezer compartment 6 can be cooled.
  • the freezer compartment damper 13 is used to switch whether or not the gas flows into the freezer compartment 6 .
  • a movable fan cover that covers the outside of the fan 12 may also be used. It can be made that: when the fan cover is opened, the gas discharged from the fan 12 flows into the freezer compartment 6, and when the fan cover is closed, the gas discharged from the fan 12 does not flow into the freezer compartment 6.
  • a refrigerator compartment damper 14 is provided between the lower cooling flow path 10A and the upper cooling flow path 10B. With the refrigerator compartment damper 14 open, the gas passing through the evaporator 24 flows from the lower cooling flow path 10A to the upper cooling flow path 10B. Further, the gas flowing into the upper cooling flow path 10B flows into the refrigerator compartment 7 from the cooling flow path 10 (upper cooling flow path 10B) through the respective openings provided at a plurality of height positions. On the other hand, in the closed state of the refrigerator compartment damper 14 , the gas passing through the evaporator 24 is prevented from flowing from the lower cooling flow path 10A to the upper cooling flow path 10B. As shown in FIG. 1 , the damper 14 of the refrigerator compartment is in an open state, and the gas flow at this time is shown by dotted arrows.
  • the fan 12 is driven, and when the refrigerating compartment damper 14 is opened, the gas flowing into the refrigerating compartment 7 from the cooling flow path 10 (upper side cooling flow path 10B) circulates in the refrigerating compartment 7 and flows into the lower opening of the refrigerating compartment 7.
  • the return flow path 15 is provided so that the gas circulating in the refrigerator compartment 7 flows into the lower side of the cooling flow path 10 (lower side cooling flow path 10A) instead of flowing in the freezer compartment 6 .
  • the return flow path 15 is provided spaced apart from the cooling flow path 10 .
  • the gas that flows into refrigerator compartment 7 from cooling channel 10 (upper cooling channel 10B) and circulates in refrigerator compartment 7 flows into return channel 15 from inlet 15A.
  • the inflowing gas flows in the return flow path 15, and flows into the lower side of the cooling flow path 10 (lower cooling flow path 10A) from the lower outlet 15B. That is, the gas flows into the lower side of the evaporator 24 provided in the cooling channel 10 (the lower cooling channel 10A). In this way, the gas is cooled again by passing through the evaporator 24 to repeat the same flow cycle. In this way, the goods stored in the refrigerator compartment 7 can be cooled.
  • a machine room 40 in which a compressor 21, a condenser 22, an evaporating dish (not shown) and the like are provided.
  • Fig. 2 is a block diagram showing the configuration of the cooling circuit 20 of the refrigerator 1 according to the present invention. Next, an outline of the cooling circuit 20 will be described with reference to FIG. 2 .
  • the cooling circuit 20 includes a compressor (compressor) 21 , a condenser (condenser) 22 , a capillary tube 23 and an evaporator 24 .
  • the components of the cooling circuit 20 are fluidly connected in the above-mentioned order by pipes to be described later, and form a first refrigerant flow path through which the refrigerant circulates in the cooling circuit 20 .
  • the arrows described in FIG. 2 indicate the flow direction of the refrigerant.
  • the compressor 21 compresses the refrigerant in a gaseous state to bring it into a state of high temperature and high pressure.
  • the compressed refrigerant is sent to the condenser 22 through the pipe 25 .
  • the piping 25 is provided with a switching valve (three-way valve) 31 to be described later, and the piping 25 is divided into a piping 25a and a piping 25b.
  • the compressor 21 includes an inverter, and the amount of refrigerant discharged by the compressor per unit time can be adjusted by changing the rotation speed, thereby controlling the cooling capacity of the cooling circuit 20 .
  • the condenser 22 releases the heat of the refrigerant compressed by the compressor 21 to condense the refrigerant.
  • the condensed refrigerant is sent to the capillary tube 23 through the pipe 26 .
  • the capillary 23 reduces the pressure of the refrigerant condensed by the condenser 22 to expand it, thereby lowering the temperature.
  • the expanded refrigerant is sent to heat exchange pipe 24A of evaporator 24 through pipe 27 .
  • the refrigerant decompressed by the capillary tube 23 evaporates and absorbs heat.
  • the evaporated refrigerant in a gaseous state is sent to the compressor 21 through the suction pipe 28 and compressed again.
  • the cooling circuit 20 operates in this way.
  • the capillary 23 is connected to the condenser 22 and the evaporator 24 through the piping 26 and the piping 27 , but the piping 26 , 27 may also be included in the capillary 23 .
  • a suction pipe 28 for flowing the refrigerant from the evaporator 24 to the compressor 21 is provided close to at least part of the capillary tube 23 so as to enable heat exchange with the capillary tube 23 .
  • the area 29 enclosed by the dotted line in FIG. 2 shows the outline of this heat exchange part.
  • the evaporator 24 When the evaporator 24 exchanges heat with the gas flowing in the refrigerator 1, it may be frosted by water vapor contained in the gas. Then, in order to defrost the evaporator 24, in the refrigerator 1 of this embodiment, the hot gas defrosting process and the gas defrosting process described later are performed.
  • the hot gas defrosting process a hot gas refrigerant compressed by the compressor 21 is used.
  • the cooling circuit 20 comprises a hot gas bypass 30 connected to a pipe 25 connecting downstream of the compressor 21 and upstream of the condenser 22 .
  • connection part is provided with a switching valve (three-way valve) 31, which can change the refrigerant delivered from the compressor 21 through the piping 25a, and make it flow to the condenser 22 (that is, the piping 25b) or the hot gas side. Either side of the through pipe 30. In this way, it can be controlled whether the refrigerant flows to the condenser 22 to cool the evaporator 24 or flows to the hot gas bypass pipe 30 to defrost the evaporator 24 .
  • the hot gas bypass pipe 30 is connected to a pipe connecting the downstream of the capillary 23 and the upstream of the evaporator 24 .
  • the hot gas bypass pipe 30 constitutes a The refrigerant flows through the second refrigerant flow path of the compressor 21 -pipe 25 -hot gas bypass pipe 30 -pipe 27 -evaporator 24 .
  • the upstream side end portion of the hot gas bypass pipe 30 is connected to the piping 25 , however, it is not limited to this configuration.
  • the upstream end of the hot gas bypass pipe 30 may be connected to the pipe 26 connecting the downstream of the condenser 22 and the upstream of the capillary 23 .
  • the switching valve (three-way valve) 31 is opened and closed by a control unit 100 (see FIG. 4 ).
  • the controller 100 controls the switching valve (three-way valve) 31 so that the refrigerant discharged from the compressor 21 through the pipe 25a flows to the condenser 22 (that is, the pipe 25b) during normal operation, and flows to the condenser 22 (that is, the pipe 25b) during hot gas defrosting processing described later.
  • Hot gas bypass pipe 30 is opened and closed by a control unit 100 (see FIG. 4 ).
  • the controller 100 controls the switching valve (three-way valve) 31 so that the refrigerant discharged from the compressor 21 through the pipe 25a flows to the condenser 22 (that is, the pipe 25b) during normal operation, and flows to the condenser 22 (that is, the pipe 25b) during hot gas defrosting processing described later.
  • Hot gas bypass pipe 30 Hot gas bypass pipe 30.
  • the state in which the refrigerator 1 operates normally that is, the state in which it operates to cool the inside of the refrigerator or to maintain the temperature in the refrigerator
  • normal operation the state in which the refrigerator 1 is operated to defrost the evaporator 24
  • hot gas defrosting process the state in which the refrigerator 1 is operated to defrost the evaporator 24
  • Fig. 3 is a diagram of piping near the evaporator 24 in the refrigerator 1 of the present invention.
  • the capillary tube 23 is connected to an inlet 24A1 of the heat exchange pipe 24A of the evaporator 24 through a pipe 27 .
  • An outlet 24A2 of the heat exchange pipe 24A of the evaporator 24 is connected to a suction pipe 28 .
  • Both the inlet 24A1 and the outlet 24A2 of the heat exchange pipe 24A of the evaporator 24 are provided on the upper side of the evaporator 24 .
  • the pipe 27 is connected to the hot gas bypass pipe 30 on the upstream side of the connection with the evaporator 24 .
  • the penetration portion 32 is shown upstream of the pipe 27 (or the capillary 23 ) and the hot gas bypass pipe 30 .
  • the piping 27 (or the capillary tube 23 ) and the hot gas bypass pipe 30 are provided so as to communicate with the lower area of the case 2 through the penetration portion 32 .
  • the hot gas bypass pipe 30 is not used during normal operation of the refrigerator 1 . However, during this normal operation, at least a part of the refrigerant becomes liquid in the cooling flow path from the condenser 22 to the evaporator 24, and the liquid refrigerant flowing from the capillary 23 to the evaporator 24 may be different from the normal flow of the refrigerant.
  • the opposite direction flows into the hot gas bypass pipe 30 .
  • a specified amount of refrigerant is injected into the cooling circuit 20 so that specified cooling performance is satisfied.
  • the amount of refrigerant that can be effective during the normal operation of the cooling circuit 20 decreases, and the specified cooling performance may not be satisfied.
  • the operation rate of the cooling circuit 20 for cooling the evaporator 24 increases (for example, the amount of refrigerant discharged from the compressor 21 increases, etc.), and thus the amount of power consumed may increase.
  • the hot gas bypass pipe 30 (as shown in FIG. 3 ) of the refrigerator 1 of the present embodiment has a connecting portion 30 a configured to connect the hot gas bypass pipe 30 and the piping 27 ( or the capillary 23) (hereinafter referred to as the first pipe as appropriate).
  • Point A represents a joint point between the hot gas bypass pipe 30 and the first pipe 27 . Since the refrigerant flowing toward the first pipe 27 downstream of the capillary 23 basically flows in a liquid state, it tends to flow downward in the vertical direction due to the force of gravity. As a result, the flow of the refrigerant to the hot gas bypass pipe 30 can be suppressed due to the piping connection from the vertical direction upward like the connecting portion 30a of the hot gas bypass pipe 30 of the present embodiment.
  • the hot gas bypass pipe 30 may be provided with a refrigerant backflow preventing portion 30b.
  • the refrigerant backflow preventing portion 30b is placed in a part of the hot gas bypass pipe 30, and the upstream side of the part stands up substantially vertically with respect to the downstream side, so that the upstream side of the hot gas bypass pipe 30 is perpendicular to the downstream side. It is located on the upper side, and on the upstream side of this part, it is formed so as to descend downward in the vertical direction.
  • the position in the vertical direction rises first, then falls, and the lower side is opened in a substantially U-shape, even if the liquid refrigerant flows into the hot gas bypass pipe 30, it is difficult for the refrigerant to pass through the vertical pipe on the downstream side of the refrigerant backflow preventing portion 30b.
  • the hot gas further flows into the upstream side of the hot gas bypass pipe 30 from the raised portion. Accordingly, it is possible to suppress the flow of the refrigerant upstream of the refrigerant backflow preventing portion 30b, and suppress the amount of refrigerant flowing into the hot gas bypass pipe 30 to a certain amount or less.
  • a check valve may be provided at the piping 30c for connecting to the connection portion 30a of the hot gas bypass pipe 30, so that the refrigerant can be suppressed from flowing into the upstream side.
  • the refrigerant filled in the cooling circuit 20 in consideration of the reduction of the refrigerant (that is, in consideration of the possible reduction of the refrigerant in the volume portion from the above-mentioned point A to the refrigerant backflow prevention part 30b). The total amount of refrigerant and cooling control.
  • the refrigerant backflow preventing portion 30b is located on the lower rear side of the casing 2, and is provided at a portion that is thermally insulated from the outside air by a foam heat insulating material or the like.
  • the piping in the vicinity of the evaporator 24 is not limited to the above, as long as at least the inlet 24A1 and the outlet 24A2 of the heat exchange pipe 24A of the evaporator 24 are provided on the upper side of the evaporator 24 and the hot gas bypass pipe 30 communicates with the heat exchange pipe 24A.
  • Inlet 24A1 any other piping arrangements are also conceivable.
  • the hot gas refrigerant leaving the compressor 21 is supplied to the inlet 24A1 of the heat exchange pipe 24A of the evaporator 24 through the hot gas bypass pipe 31 , so that the hot gas defrosting process of the evaporator 24 can be performed.
  • the heat exchange pipe 24A is heated by the hot gaseous refrigerant flowing through the heat exchange pipe 24A, and the fins are also heated by heat conduction. This melts the frost attached to the evaporator 24, and the melted liquid falls.
  • the falling liquid is received by a receiving pan provided on the lower side of the evaporator 24 , and flows into the evaporating pan in the machine room 40 through the draft tube.
  • the liquid flowing into the evaporating pan evaporates into the atmosphere.
  • the heat exchange pipe 24A of the evaporator 24 meanders from the inlet 24A1 located on the upper side of the evaporator 24 to the lower side, and then meanders from the lowest point to the upper side again, and reaches the evaporator.
  • the heat exchange pipe 24AA is shown in an omitted manner meandering back to the upper side. That is, both the inlet 24A1 and the outlet 24A2 of the heat exchange pipe 24A are located on the upper side of the evaporator 24 .
  • FIG. 4 is a block diagram showing a control system 100 associated with defrosting of the refrigerator 1 according to one embodiment of the present invention.
  • the control system 100 constitutes a part of the control system of the refrigerator 1 .
  • the control system 100 may receive measurement data (signals) from the temperature sensor 50 (refer to FIG. 1 ) provided in the refrigerator compartment 50 .
  • the control system 100 may receive timing data (signal) from the timer 51 .
  • the control system 100 may transmit control signals to the compressor 21 , the fan 12 , the freezer damper 13 , the refrigerator compartment damper 14 and the switching valve (three-way valve) 31 .
  • Fig. 5A is a control timing chart when hot gas defrosting processing and gas defrosting processing are performed.
  • the first defrosting program is performed by the control system 100, wherein the hot gas defrosting process and the gas defrosting process are performed; and the second defrosting process is performed, wherein the gas defrosting process is stopped, and only the hot gas The defrosting process continues.
  • the on-off of the compressor 21 and the fan 12 and the opening and closing of the freezer compartment damper 13 and the refrigerating compartment damper 14 are controlled correspondingly according to the temperature condition in the refrigerator.
  • the gas passing through the evaporator 24 can be supplied into the freezer compartment 6 to cool it.
  • the refrigerator compartment damper 14 by opening the refrigerator compartment damper 14 in a state where the compressor 21 and the fan 12 are turned on, the gas passing through the evaporator 24 can be supplied into the refrigerator compartment 7 to cool it.
  • the gas that can pass through evaporator 24 can be supplied in freezing compartment 6 and refrigerating compartment 7 so that these two compartments are cooled. cool down.
  • the switching valve (three-way valve) 31 is kept closed.
  • a first defrosting process is performed in which both the hot gas defrosting process and the gas defrosting process are performed. Specifically, by opening the switching valve (three-way valve) 31 in the state where the compressor 21 is turned on, or turning on the compressor 21 after opening the switching valve (three-way valve) 31, the hot gas bypass pipe 31 is turned on. The hot gas refrigerant is supplied to the evaporator 24 for the hot gas defrosting process.
  • a gas defrosting process is performed in which the refrigerating compartment damper 14 is opened with the fan 12 turned on, the gas is supplied from the cooling flow path 10 to the refrigerating compartment 7, and the gas is circulated in the refrigerating compartment 7 to raise the temperature.
  • the gas is supplied to the lower side of the evaporator 24.
  • the first defrosting process that performs both the hot gas defrosting process and the gas defrosting process starts.
  • the freezer compartment damper 13 is always closed, which can prevent the gas with temperature rise from flowing into the freezer compartment 6 .
  • the temperature of the gas circulating in the refrigerator compartment 7 gradually rises, so the temperature in the refrigerator compartment 7 may rise too high. Therefore, after a certain time elapses after the start of the first defrosting process, a second defrosting process is performed in which the gas defrosting process is stopped and only the hot gas defrosting process is continued. In this case, the freezer compartment damper 13 is also always closed, which can prevent the temperature-rising gas from flowing into the freezer compartment 6 .
  • the fan cover is always closed during the first defrosting process and the second defrosting process, thereby preventing the temperature-rising air from flowing into the freezing chamber 6 .
  • the timing of switching from the first defrosting program to the second defrosting program uses the timing data according to the timer 51. After a predetermined time has elapsed, the fan 12 can be cut off and the refrigerator compartment damper 14 can be closed to stop the gas defrosting process. control processing. In addition, when the temperature measured by the temperature sensor 50 provided in the refrigerator compartment 7 reaches a preset temperature, the control process of turning off the fan 12 and closing the refrigerator compartment damper 14 to stop the gas defrosting process may also be performed.
  • the information from both the timer 51 and the temperature sensor 50 can be used to determine the timing of switching from the first defrosting procedure to the second defrosting procedure.
  • the refrigerator compartment damper 14 may be closed, but the fan 12 may continue to be driven.
  • the second defrosting process may be ended when a predetermined time point elapses based on the timing message from the timer 51 .
  • the open switching valve (three-way valve) 31 is closed to stop the hot gas defrosting process, and the cooling circuit 20 returns to the normal operation mode.
  • the freezer compartment 6 or the refrigerator compartment 7 can be cooled by turning off the fan 12 and opening the freezer compartment damper 13 or the refrigerator compartment damper 14 .
  • the temperature sensor 50 is disposed on the upper side of the refrigerating chamber 7 , however, it is not limited thereto, and the temperature sensor 50 may be disposed at any position in the refrigerating chamber 7 .
  • a temperature sensor is provided in the cooling flow path 10, and the timing of switching from the first defrosting course to the second defrosting course can be determined based on temperature data from the temperature sensor.
  • Fig. 5B is a control time chart when only the hot gas defrosting process is performed.
  • conventionally performed control when only the hot gas defrosting process is performed is as follows.
  • the hot gas defrosting process is started by opening the switching valve (three-way valve) 31 while the compressor 21 is on, or by opening the switching valve (three-way valve) 31 and then turning on the compressor 21 . After a certain period of time, the switching valve (three-way valve) 31 is closed to end the hot gas defrosting process.
  • the refrigerator compartment 7 is above the evaporator 24, and the gas flowing in the refrigerator compartment 7 returns to the lower side of the evaporator 24 through the return flow path 15, but the present invention is not limited thereto.
  • the gas flowing in the refrigerator compartment 7 can flow into the lower side of the evaporator 24 as it is.
  • a three-way valve is used as the switching valve 31 , however, it is not limited thereto.
  • a T-shaped pipe is installed at the branch, and an on-off valve is provided on the branch side (the side of the hot gas bypass pipe 30 ), so that the same function as that of the three-way valve can also be realized.
  • the on-off valve functions as the switching valve 31 .
  • the refrigerator of the present invention includes: a refrigerating chamber 7; a cooling circuit 20, in which a cooling cycle is implemented, and in the cooling cycle, the refrigerant flows through the compressor 21, the condenser 22, the evaporator 24 and returns to the compressor 21 again ; hot gas bypass pipe 30, which directly connects the outlet side of compressor 21 and the inlet side of evaporator 24; and fan 12, which is used to make the gas flow in the refrigerator; the gas is circulated as follows by fan 12: passing from bottom to top The gas of the evaporator 24 flows into the refrigerating room 7, and the gas flowing in the refrigerating room 7 returns to the lower side of the evaporator 24 again; the inlet 24A1 and the outlet 24A2 of the heat exchange pipe 24A of the evaporator 24 for refrigerant flow are arranged in the evaporator 24; implement the first defrosting process, wherein the refrigerant discharged from the compressor 21 passes through the hot gas bypass pipe 30 and is supplied to the inlet 24A
  • the refrigerator 1 of this embodiment implements the second defrosting procedure after the first defrosting procedure starts, when a predetermined time elapses or when the temperature of the gas flowing in the refrigerating chamber 7 reaches a preset temperature, the second defrosting procedure is stopped. Gas defrost treatment, and hot gas defrost treatment only.
  • the defrosting process using the gas flowing in the refrigerator compartment 7 continues, the temperature of the circulating gas rises, and there is a risk that the temperature inside the refrigerator compartment 7 rises.
  • the gas defrosting process is stopped, and only the hot gas defrosting process is performed. In this way, the defrosting process of the evaporator 24 can be efficiently performed while suppressing the temperature rise of the refrigerator compartment 7 .
  • the refrigerator 1 of the present embodiment also includes: a switching valve 31 that switches between an open state and a closed state.
  • a switching valve 31 that switches between an open state and a closed state.
  • the refrigerant discharged from the compressor 21 flows to the hot gas bypass pipe 30 side to implement hot gas defrosting treatment.
  • the closed state the refrigerant discharged from the compressor 21 flows to the side of the condenser 22 to implement normal operation; the refrigerating room damper 14 switched between the open state and the closed state, in the open state, the gas is cooled from the evaporator 24.
  • the flow path 10 flows to the refrigerating chamber 7, and in the closed state, the gas does not flow from the cooling flow path 10 to the refrigerating chamber 7; and the control unit 100 is used to control the compressor 21, the fan 12, the switching valve 31 and the refrigerating chamber damper 14;
  • the control unit 100 starts the first defrosting process in the following manner: the switching valve 31 is opened while the compressor 21 is turned on, and the refrigerating compartment damper 14 is opened while the fan 12 is turned on.
  • the temperature of the gas flowing in the refrigerating chamber 7 reaches a preset temperature, at least the refrigerating chamber damper 14 is closed to switch from the first defrosting program to the second defrosting program.
  • the control unit 100 controls the compressor 21, the fan 12, the switching valve 31, and the refrigerating compartment damper 14 by the control unit 100, the first defrosting course and the second defrosting course can be reliably performed.
  • the control unit 100 performs the defrosting process from the first defrosting process to the second defrosting process based on the timing data of the timer 51 or the measurement data of the temperature sensor 50 provided in the refrigerator compartment 7. Therefore, the conversion from the first defrosting program to the second defrosting program can be performed at an accurate timing.
  • the refrigerator 1 of this embodiment also includes: a freezer compartment 6; and a freezer compartment damper 13 that switches between an open state and a closed state.
  • the open state the gas flows from the cooling flow path 10 to the freezer compartment 6.
  • the control unit 100 maintains the freezing compartment damper 13 in a closed state during the implementation of the first defrosting procedure and the second defrosting procedure.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Defrosting Systems (AREA)

Abstract

L'invention concerne un réfrigérateur comprenant : un compartiment de réfrigération ; une boucle de refroidissement dans laquelle un cycle de refroidissement est mis en œuvre, et dans laquelle pendant le cycle de refroidissement, un fluide frigorigène s'écoule successivement à travers un compresseur, un condenseur et un évaporateur et revient à nouveau au compresseur ; un tuyau de dérivation de gaz chaud, qui est directement relié à un côté de décharge du compresseur et à un côté d'admission de l'évaporateur ; et un ventilateur, qui est utilisé pour permettre à un gaz dans le réfrigérateur de s'écouler. Le gaz est mis en circulation par le ventilateur de la manière suivante : le gaz qui passe à travers l'évaporateur de bas en haut s'écoule dans le compartiment de réfrigération, et le gaz s'écoule dans le compartiment de réfrigération revient à nouveau vers un côté inférieur de l'évaporateur ; une entrée et une sortie d'une conduite d'échange de chaleur de l'évaporateur à travers laquelle le fluide frigorigène s'écoule sont disposées en correspondance sur un côté supérieur de l'évaporateur ; une première procédure de dégivrage est mise en œuvre, dans laquelle un traitement de dégivrage par gaz chaud est effectué et dans lequel un fluide frigorigène refoulé à partir du compresseur est fourni, au moyen du tuyau de dérivation de gaz chaud, à l'entrée de la conduite d'échange de chaleur, et, en même temps, un traitement de dégivrage par gaz est effectué et dans lequel le gaz s'écoulant dans le compartiment de réfrigération (7) est fourni au côté inférieur de l'évaporateur.
PCT/CN2022/103925 2021-07-15 2022-07-05 Réfrigérateur WO2023284589A1 (fr)

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CN202280049627.9A CN117751265A (zh) 2021-07-15 2022-07-05 冰箱

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JP2021117356A JP2023013290A (ja) 2021-07-15 2021-07-15 冷蔵庫
JP2021-117356 2021-07-15

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1477361A (zh) * 2002-08-19 2004-02-25 乐金电子(天津)电器有限公司 冰箱除湿装置
CN1548882A (zh) * 2003-05-20 2004-11-24 乐金电子(天津)电器有限公司 冰箱的除霜装置及其除霜方法
CN1888763A (zh) * 2005-06-30 2007-01-03 乐金电子(天津)电器有限公司 冰箱的除霜装置
CN206113475U (zh) * 2016-09-22 2017-04-19 合肥华凌股份有限公司 一种风冷冰箱的除霜系统和风冷冰箱
JP2018054287A (ja) * 2017-11-29 2018-04-05 三菱電機株式会社 冷蔵庫

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1477361A (zh) * 2002-08-19 2004-02-25 乐金电子(天津)电器有限公司 冰箱除湿装置
CN1548882A (zh) * 2003-05-20 2004-11-24 乐金电子(天津)电器有限公司 冰箱的除霜装置及其除霜方法
CN1888763A (zh) * 2005-06-30 2007-01-03 乐金电子(天津)电器有限公司 冰箱的除霜装置
CN206113475U (zh) * 2016-09-22 2017-04-19 合肥华凌股份有限公司 一种风冷冰箱的除霜系统和风冷冰箱
JP2018054287A (ja) * 2017-11-29 2018-04-05 三菱電機株式会社 冷蔵庫

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