CN114593553B - Constant-temperature chamber of refrigerator, control method of constant-temperature chamber and refrigerator - Google Patents

Constant-temperature chamber of refrigerator, control method of constant-temperature chamber and refrigerator Download PDF

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CN114593553B
CN114593553B CN202210327212.5A CN202210327212A CN114593553B CN 114593553 B CN114593553 B CN 114593553B CN 202210327212 A CN202210327212 A CN 202210327212A CN 114593553 B CN114593553 B CN 114593553B
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temperature
air
constant
duct
temperature chamber
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CN114593553A (en
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黄东
杨易坤
赵日晶
郭文华
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Xian Jiaotong University
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Xian Jiaotong University
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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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/12—Arrangements of compartments additional to cooling compartments; Combinations of refrigerators with other equipment, e.g. stove
    • 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
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/067—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by air ducts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Abstract

The invention discloses a constant-temperature chamber of a refrigerator and a control method thereof, and relates to the technical field of refrigerators. The constant-temperature chamber is externally provided with an air supply duct, an air return duct and an air mixing duct; the constant-temperature chamber is communicated with a return air duct through an air return port; a heat exchanger air door and a mixed air door are arranged at the joint of the return air duct and the mixed air duct, the mixed air duct is divided into a first air duct and a second air duct by the heat exchanger air door and the mixed air door, and the tops of the first air duct and the second air duct are communicated; the first air duct is internally provided with a phase change cold accumulation heat exchanger; the air mixing duct is communicated with the air supply duct through a fan; an air supply temperature sensor is arranged in the air supply duct; the air supply duct is communicated with the constant-temperature chamber through an air supply outlet. By adopting a mixed air supply mode, the purposes of small air supply temperature difference, large air supply quantity and variable air supply temperature are achieved. The temperature fluctuation of the constant temperature chamber can be reduced to the maximum extent, and the user can freely set the temperature of the constant temperature chamber according to the requirement.

Description

Constant-temperature chamber of refrigerator, control method of constant-temperature chamber and refrigerator
Technical Field
The invention belongs to the technical field of refrigerator design, and particularly relates to a constant-temperature chamber of a refrigerator, a control method of the constant-temperature chamber and the refrigerator.
Background
With the increasing pursuit of people for high-end living standards, refrigerators with a special area function are more and more favored by the market. Constant temperature zones have become popular as a most well-accepted zone function in various brands of medium and high end series refrigerators. However, the current constant-temperature special area still cannot solve the problem of temperature fluctuation of the constant-temperature chamber, and the reason for the phenomenon is that on one hand, the difference between the air supply temperature and the constant-temperature chamber temperature is large, and on the other hand, 24h uninterrupted cooling of a single constant-temperature chamber cannot be realized. Therefore, constant-temperature fresh-keeping of refrigerator constant-temperature rooms on the market can only be achieved to a certain extent, user requirements cannot be well met, and actual experience of users is seriously influenced.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems occurring in the background, and an object of the present invention is to provide a constant temperature compartment of a refrigerator, a control method thereof, and a refrigerator. By matching with the control mode of the constant-temperature chamber, the accurate temperature control of the constant-temperature chamber is realized, and the disturbance resistance of the temperature in the constant-temperature chamber is enhanced.
In order to achieve the above object, the present invention provides the following technical solutions.
A constant temperature chamber of a refrigerator is provided with an air supply duct, an air return duct and an air mixing duct outside;
the constant-temperature chamber is communicated with a return air duct through an air return port; a heat exchanger air door and a mixed air door are arranged at the joint of the return air duct and the mixed air duct, the mixed air duct is divided into a first air duct and a second air duct by the heat exchanger air door and the mixed air door, and the tops of the first air duct and the second air duct are communicated; the first air duct is internally provided with a phase change cold accumulation heat exchanger; the air mixing duct is communicated with the air supply duct through a fan; an air supply temperature sensor is arranged in the air supply duct; the air supply duct is communicated with the constant-temperature chamber through an air supply outlet.
As a further improvement of the invention, the heat exchanger damper is arranged at the inlet of the first air duct and is opposite to the inlet of the phase change cold storage heat exchanger; the air mixing damper is arranged at the inlet of the second air duct.
As a further improvement of the invention, the air supply temperature sensor is arranged at the position of the air supply duct opposite to the fan; the plurality of air supply outlets are uniformly arranged on the air supply duct; the plurality of air return inlets are uniformly arranged on the air return duct.
As a further improvement of the invention, the phase change cold storage heat exchanger consists of a phase change material and an evaporator coil.
A refrigerator comprises the constant-temperature chamber of the refrigerator.
A control method for constant-temperature chamber of refrigerator features that the opening of air door of heat exchanger and the opening of air door of air mixer are controlled to control the mixing ratio of cold air to return air and regulate the temp and quantity of air.
As a further improvement of the present invention, the control method in the steady operation state includes:
s101: after the constant-temperature chamber enters a stable operation state, the fan is started, and the opening degree of the air mixing air door is adjusted to be 100%; adjusting the opening degree of a heat exchanger air door according to the difference value of the air supply temperature Ts and the set temperature Td of the constant temperature chamber; adjusting the rotating speed of the fan according to the difference value of the constant temperature chamber temperature T and the environment temperature Ta;
s102: calculating the starting time of the fan, if the continuous working time of the fan is not longer than the set time, returning to the step S101, otherwise, entering the step S103;
s103: adjusting the opening degree of an air door of the evaporator to 100%, closing the air mixing air door, and supplying air at the lowest air supply temperature;
s104: judging whether the difference value between the set temperature Td and the constant temperature chamber temperature T is greater than a set value T, if Td-T is greater than T, turning off the fan and entering the step S105, otherwise, returning to the step S103;
s105: and judging the sizes of the constant temperature chamber temperature T and the set temperature Td, if T is greater than Td, returning to the step S101, and otherwise, entering the step S104.
As a further improvement of the present invention, the adjusting of the opening degree of the evaporator damper according to the difference between the supply air temperature Ts and the constant temperature compartment set temperature Td is: adjusting the opening degree of an air door of the evaporator to ensure that the air supply temperature Ts of the constant-temperature compartment is 1-3 ℃ lower than the set temperature Td all the time;
the step of adjusting the rotating speed of the fan according to the difference value of the temperature T of the constant temperature chamber and the ambient temperature Ta refers to: a linear relation exists between the rotating speed of the fan and the temperature difference value, and the formula is satisfied:
Figure GDA0003867105490000031
wherein, P is the rotating speed of the fan; t is the temperature of the constant-temperature chamber; t is 1 The minimum difference value of the constant temperature chamber temperature T and the environment temperature Ta; t is 2 The maximum difference value of the constant temperature chamber temperature T and the environment temperature Ta; p is 2 Is the upper limit of the rotating speed of the fan; p 1 The lower limit of the rotating speed of the fan;
the minimum difference T between the constant temperature chamber temperature T and the environment temperature Ta 1 ，T 1 Taking the mixture at 0-10 ℃;
the maximum difference value T between the constant temperature chamber temperature T and the environment temperature Ta 2 ，T 2 Taking the mixture to be 40-45 ℃;
setting the temperature Td of the constant-temperature chamber, wherein the Td is-5 ℃;
the set value t, t is 0-5 ℃.
As a further improvement of the invention, the control mode of the unstable operation state comprises the following steps:
s201: after the constant-temperature chamber enters an unstable operation state, the fan is started, the opening degree of the air door of the heat exchanger is adjusted to be 100%, the opening degree of the air door of the mixed air is adjusted to be 100%, and the operation is continued and then the step S202 is executed;
s202: calculating the temperature reduction rate K of the constant-temperature chamber, and comparing the value of K with a set value K0: if K < K0, go to step S203; otherwise, the opening degree of the air door of the heat exchanger is adjusted to be 100%, the air mixing air door is closed, and the rotating speed of the fan is reduced;
s203: the fan is started and stopped according to the temperature T of the constant-temperature chamber and the start and stop point;
s204: calculating the temperature rise rate L during shutdown, and comparing the value of L with a set value L0: if L is less than L0, the constant-temperature chamber control mode is changed into a stable operation mode, and a control mode in a stable state is executed; otherwise, the process returns to step S203.
As a further improvement of the invention, the set value K0 of the temperature reduction rate of the constant-temperature chamber is 0.3-0.6 ℃/min;
the set value L0 of the temperature rising and falling rate of the constant-temperature chamber is 0.4-0.8 ℃/min;
the fan is started and stopped according to the constant temperature room temperature T and the start-stop point, and the starting and stopping operations are as follows: when the constant temperature chamber temperature T is higher than the starting point temperature, the air door is opened, and when the constant temperature chamber temperature T is lower than the stopping point temperature, the air door is closed;
the basis for judging that the constant-temperature chamber is changed from the stable operation state to the unstable operation state is as follows:
(1) the constant-temperature chamber door of the constant-temperature chamber is continuously opened for 10s or is opened for 20s in a short time in an accumulated way;
(2) the temperature T of the thermostatic chamber suddenly rises in a short time and exceeds the allowable temperature fluctuation range;
and if any one of the two conditions is met, judging that the constant-temperature chamber enters an unstable running state at the moment.
Compared with the prior art, the invention has the beneficial effects that:
the air-conditioning system comprises an air supply duct, an air return duct and an air mixing duct, wherein the air mixing duct uses a phase change cold accumulation heat exchanger to realize 24h uninterrupted cold supply of a constant-temperature chamber. The phase change cold accumulation heat exchanger uses a phase change material as a cold source to ensure the stability and controllability of the air supply temperature; the heat exchanger air door is used for controlling the air quantity entering the phase change cold accumulation heat exchanger; the air mixing damper is used for controlling the return air volume participating in mixing. By adopting a mixed air supply mode, the purposes of small air supply temperature difference, large air supply quantity and variable air supply temperature are achieved. The temperature fluctuation of the constant temperature chamber can be reduced to the maximum extent, and the user can freely set the temperature of the constant temperature chamber according to the requirement.
The control method of the invention adopts the method of mixing cold air and return air and then supplying air, thereby reducing the temperature difference of the supplied air, increasing the flow rate of the supplied air, and realizing the purposes of reducing the temperature fluctuation of the room at a constant temperature and increasing the uniformity of a temperature field. Meanwhile, the phase change cold accumulation heat exchanger is used as a cold source of the constant-temperature chamber, and the requirement of 24h uninterrupted cold supply of the constant-temperature chamber is met. By matching with the control mode of the constant-temperature chamber, the accurate temperature control of the constant-temperature chamber is realized, and the disturbance resistance of the temperature in the constant-temperature chamber is enhanced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.
FIG. 1 is a schematic view of a thermostatic chamber according to a preferred embodiment of the present invention;
FIG. 2 is a flow chart of the control mode of the preferred embodiment of the present invention in a steady operation state;
fig. 3 is a flow chart of the control mode in the non-steady operation state of the preferred embodiment of the present invention.
Detailed Description
In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a first embodiment of the present invention provides a constant temperature compartment of a refrigerator, which includes an air supply duct 101, an air return duct 102, an air mixing duct 103, a phase change cold storage heat exchanger 1, a fan 2, a heat exchanger damper 3, an air mixing damper 4, an air supply outlet 5, an air return inlet 6, and an air supply temperature sensor 7.
The outside of the constant-temperature compartment is provided with an air supply duct 101, an air return duct 102 and an air mixing duct 103;
the constant-temperature chamber is communicated with a return air duct 102 through a return air inlet 6; the joint of the return air duct 102 and the mixed air duct 103 is provided with heat exchanger air doors 3 and 4, the mixed air duct 103 is divided into a first air duct and a second air duct by the heat exchanger air door 3 and the mixed air door 4, and the tops of the first air duct and the second air duct are communicated; the first air duct is internally provided with a phase change cold accumulation heat exchanger 1; the air mixing duct 103 is communicated with the air supply duct 101 through the fan 2; an air supply temperature sensor 7 is arranged in the air supply duct 101; the air supply duct 101 is communicated with the constant temperature chamber through an air supply outlet 5.
The heat exchanger air door 3 is arranged at the inlet of the phase change cold accumulation heat exchanger 1; the air mixing damper 4 is arranged at the inlet of the air mixing duct 103; the air supply temperature sensor 7 is arranged at the position of the air supply duct 101 opposite to the fan 2; the plurality of air supply outlets 5 are uniformly arranged on the air supply duct 101; the plurality of return air inlets 6 are uniformly arranged on the return air duct 102.
The air flow circulation principle is as follows:
the air in the constant temperature room enters the return air duct 102 through the return air inlet 6 and is divided into two parts by the heat exchanger air door 3 and the air mixing air door 4. One part of the air flow is cooled by the phase change cold accumulation heat exchanger 1, the other part of the air flow directly enters the air mixing air duct 103 through the air mixing air door 4, and is mixed with the air flow cooled by the phase change cold accumulation heat exchanger 1 and then is blown into the air supply air duct 101 by the fan 2. The mixed cold air enters the constant temperature chamber through a plurality of air supply outlets 5.
The phase change cold accumulation heat exchanger uses a phase change material as a cold source to ensure the stability and controllability of the air supply temperature; the heat exchanger air door is used for controlling the air quantity entering the phase change cold accumulation heat exchanger; the air mixing damper is used for controlling the return air volume participating in mixing. The invention uses the phase change cold accumulation heat exchanger to realize 24h uninterrupted cold supply of the constant temperature chamber. By adopting a mixed air supply mode, the purposes of small air supply temperature difference, large air supply quantity and variable air supply temperature are achieved. The temperature fluctuation of the constant temperature chamber can be reduced to the maximum extent, and the user can freely set the temperature of the constant temperature chamber according to the requirement.
As a preferred embodiment, the phase change cold storage heat exchanger 1 is composed of a phase change material and an evaporator coil. The phase-change material provides cold for the constant-temperature chamber, and the evaporator coil is used for cold accumulation of the phase-change material. When the cold quantity of the phase-change material is sufficient, the phase-change material is used for cooling; when the cold quantity of the phase-change material is insufficient, the evaporator coil is used for cold storage of the phase-change material. By adopting the measures, the effects of intermittent cold storage of the evaporator coil of the refrigerator and continuous cold supply of the constant-temperature chamber for 24h can be achieved.
The invention uses the phase change cold accumulation heat exchanger to realize 24h uninterrupted cold supply of the constant temperature chamber. By adopting a mixed air supply mode, the purposes of small air supply temperature difference, large air supply quantity and variable air supply temperature are achieved. The temperature fluctuation of the constant temperature chamber can be reduced to the maximum extent, and the user can freely set the temperature of the constant temperature chamber according to the requirement.
Therefore, the invention can control the mixing proportion of cold air and return air by controlling the opening of the air door 3 and the air door 4 of the heat exchanger, adjust the air supply temperature and increase the air supply volume.
The second scheme of the invention provides a control mode of a constant-temperature chamber of a refrigerator, which comprises the following steps:
the temperature control mode of the thermostatic chamber is divided into two modes, namely a control mode in a stable operation state and a control mode in an unstable operation state.
1) Control mode under the steady operation state:
the purpose of the control mode of the steady operation state is to:
1. the air supply of small temperature difference and large air quantity of the constant-temperature chamber is kept during stable operation. At the moment, the cold quantity provided for the constant temperature chamber is exactly equal to the heat leakage load of the constant temperature chamber box body.
2. After the fan continuously runs for 20 hours, the fan automatically enters a shutdown state, and the service life of the variable frequency fan is prolonged.
As shown in fig. 2, the control method includes:
s101: after the constant-temperature chamber enters a stable operation state, the fan 2 is started, and the opening degree of the air mixing air door 4 is adjusted to be 100%. The opening degree of the heat exchanger damper 3 is adjusted according to the difference between the air supply temperature Ts and the set temperature Td of the constant temperature compartment. And adjusting the rotating speed of the fan 2 according to the difference value of the constant temperature chamber temperature T and the environment temperature Ta. The process advances to step S102.
S102: and (4) calculating the starting time of the fan, returning to the step S101 if the continuous working time of the fan is less than 20h, and otherwise, entering the step S103.
S103: the opening degree of the evaporator damper 3 is adjusted to 100%, and the air mixing damper 4 is closed, and air is supplied at the lowest air supply temperature. Step 104 is entered.
S104: and judging whether the difference value between the set temperature Td and the constant temperature chamber temperature T is greater than a set value T, if the difference value is Td-T > T, turning off the fan 2 and entering the step S105, otherwise, returning to the step S103.
S105: and judging the sizes of the constant temperature chamber temperature T and the set temperature Td, if T is greater than Td, returning to the step S101, and otherwise, entering the step S104.
2) The adjustment of the opening degree of the evaporator damper 3 according to the difference between the air supply temperature Ts and the set temperature Td of the thermostatic chamber means that the opening degree of the evaporator damper 3 is adjusted so that the air supply temperature Ts of the thermostatic chamber is always 1 to 3 ℃ lower than the set temperature Td.
3) The rotating speed of the fan 2 is adjusted according to the difference value between the constant temperature chamber temperature T and the environment temperature Ta, namely, the linear relation exists between the rotating speed of the fan and the temperature difference value, and the formula is satisfied:
Figure GDA0003867105490000091
wherein P is the rotating speed of the fan; t is the temperature of the constant-temperature chamber; t is 1 The minimum difference value of the constant temperature chamber temperature T and the environment temperature Ta; t is 2 The maximum difference value of the constant temperature chamber temperature T and the environment temperature Ta; p 2 Is the upper limit of the rotating speed of the fan; p 1 Is the lower limit of the rotating speed of the fan.
In a preferred embodiment, the minimum difference T between the thermostatic chamber temperature T and the ambient temperature Ta 1 ，T 1 Taking the mixture at 0-10 ℃. For example, 0 ℃, 1 ℃, 3 ℃, 5 ℃, 8 ℃, 10 ℃ and the like.
In a preferred embodiment, the maximum difference T between the thermostatic chamber temperature T and the ambient temperature Ta 2 ，T 2 Taking the mixture at 40-45 ℃. For example, 40 ℃, 41 ℃, 43 ℃, 45 ℃ and the like.
In a preferred embodiment, the temperature Td set in the thermostatic chamber is between-5 and 5 ℃. For example, at-5 deg.C, -1 deg.C, -3 deg.C, 1 deg.C, 4 deg.C, 5 deg.C, etc.
As a preferred embodiment, the set value t, t is between 0 and 5 ℃. For example, 0 ℃, 1 ℃, 3 ℃, 5 ℃, etc.
As shown in fig. 3, the control method in the unstable operation state:
the control mode of the unstable operation state is that the load of the constant-temperature chamber is judged by calculating the cooling rate of the constant-temperature chamber, and the constant-temperature chamber is quickly adjusted from the unstable operation state to the stable operation state on the premise of ensuring small fluctuation of the temperature of the constant-temperature chamber.
S201: after the constant-temperature chamber enters an unstable operation state, the fan 2 is started, the opening degree of the air door 3 of the heat exchanger is adjusted to be 100%, the opening degree of the air mixing air door is adjusted to be 100%, the operation is continued for 2min, and the step S202 is entered.
S202: and calculating the temperature reduction rate K of the constant-temperature chamber within 5min, and comparing the K with a set value K0. If K < K0, go to step S203; otherwise, the opening degree of the air door 3 of the heat exchanger is adjusted to 100%, the air mixing air door is closed, the rotating speed of the fan 2 is reduced, and the step S203 is carried out.
S203: the fan 2 performs start-stop operation according to the constant temperature compartment temperature T and the start-stop point, and the process proceeds to step S204.
S204: a temperature rise rate L at the time of shutdown is calculated, and the value of L is compared with a set value L0. If L is less than L0, the constant-temperature chamber control mode is changed into a stable operation mode, and a control mode in a stable state is executed; otherwise, the process returns to step S203.
As a preferable embodiment, the set value K0, K0 of the temperature reduction rate of the constant temperature chamber is 0.3-0.6 ℃/min. For example, 0.3 deg.C/min, 0.4 deg.C/min, 0.5 deg.C/min, 0.6 deg.C/min, etc.
As a preferable embodiment, the set value L0, L0 of the temperature decrease rate of the thermostatic chamber is 0.4-0.8 ℃/min. For example, 0.4 deg.C/min, 0.5 deg.C/min, 0.6 deg.C/min, 0.8 deg.C/min, etc.
In a preferred embodiment, the fan 2 performs the start-stop operation according to the constant-temperature compartment temperature T and the start-stop point, that is, when the constant-temperature compartment temperature T is higher than the start-stop point temperature, the damper 2 is opened, and when the constant-temperature compartment temperature T is lower than the stop-point temperature, the damper 2 is closed.
The basis for judging that the constant-temperature chamber is changed from the stable operation state to the unstable operation state is as follows: 1. the thermostatic chamber door of the thermostatic chamber is opened continuously for 10s or cumulatively for a short time for 20s.2. The thermostatic chamber temperature T suddenly rises in a short time, exceeding the allowable temperature fluctuation range. And if any one of the two conditions is met, judging that the constant-temperature chamber enters an unstable running state at the moment.
The invention also provides a refrigerator comprising the constant-temperature chamber of the refrigerator. The thermostatic chamber is shown in figure 1.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be included within the scope of the invention.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the following claims.

Claims (6)

1. A control method of a constant temperature chamber of a refrigerator is characterized in that an air supply duct, an air return duct and an air mixing duct are arranged outside the constant temperature chamber; the constant-temperature chamber is communicated with a return air duct through an air return port; a heat exchanger air door and a mixed air door are arranged at the joint of the return air duct and the mixed air duct, the mixed air duct is divided into a first air duct and a second air duct by the heat exchanger air door and the mixed air door, and the tops of the first air duct and the second air duct are communicated; the first air duct is internally provided with a phase change cold accumulation heat exchanger; the air mixing duct is communicated with the air supply duct through a fan; an air supply temperature sensor is arranged in the air supply duct; the air supply duct is communicated with the constant-temperature chamber through an air supply outlet;
the control method of the constant-temperature chamber comprises a control mode of a stable operation state and a control mode of an unstable operation state; the constant-temperature chamber controls the mixing proportion of cold air and return air by controlling the opening of the air door of the heat exchanger and the opening of the air door of the air mixer, and adjusts the air supply temperature and the air supply quantity;
the basis for judging that the constant-temperature chamber is changed from the stable operation state to the unstable operation state is as follows:
(1) the constant-temperature chamber door of the constant-temperature chamber is continuously opened for 10s or is opened for 20s in a short time in a cumulative way;
(2) the temperature T of the thermostatic chamber suddenly rises in a short time and exceeds the allowable temperature fluctuation range;
if any one of the two conditions is met, judging that the constant-temperature chamber enters an unstable operation state at the moment;
the control mode in the stable operation state includes:
s101: after the constant-temperature chamber enters a stable operation state, the fan is started, and the opening degree of the air mixing air door is adjusted to be 100%; adjusting the opening degree of a heat exchanger air door according to the difference value of the air supply temperature Ts and the set temperature Td of the constant temperature chamber; adjusting the rotating speed of the fan according to the difference value of the constant temperature chamber temperature T and the environment temperature Ta;
the step of adjusting the rotating speed of the fan according to the difference value of the temperature T of the constant temperature chamber and the ambient temperature Ta refers to: a linear relation exists between the rotating speed of the fan and the temperature difference value, and the formula is satisfied:
Figure FDA0003867105480000011
wherein, P is the rotating speed of the fan; t is the temperature of the constant-temperature chamber; t is 1 Is the minimum of the constant temperature chamber temperature T and the ambient temperature TaA difference value; t is 2 The maximum difference value of the constant temperature chamber temperature T and the environment temperature Ta; p 2 Is the upper limit of the rotating speed of the fan; p 1 The lower limit of the rotating speed of the fan;
s102: calculating the starting time of the fan, if the continuous working time of the fan is not longer than the set time, returning to the step S101, otherwise, entering the step S103;
s103: adjusting the opening degree of an air door of the evaporator to 100%, closing the air mixing air door, and supplying air at the lowest air supply temperature;
s104: judging whether the difference value between the set temperature Td and the constant temperature chamber temperature T is greater than a set value T, if Td-T is greater than T, turning off the fan and entering the step S105, otherwise, returning to the step S103;
s105: judging the sizes of the constant temperature chamber temperature T and the set temperature Td, if T is greater than Td, returning to the step S101, otherwise, entering the step S104;
the control mode of the unstable operation state comprises the following steps:
s201: after the constant-temperature chamber enters an unstable operation state, the fan is started, the opening degree of the air door of the heat exchanger is adjusted to be 100%, the opening degree of the air door of the mixed air is adjusted to be 100%, and the operation is continued and then the step S202 is executed;
s202: calculating the temperature reduction rate K of the constant-temperature chamber, and comparing the value of K with a set value K0: if K < K0, go to step S203; otherwise, the opening degree of the air door of the heat exchanger is adjusted to be 100%, the air mixing air door is closed, and the rotating speed of the fan is reduced;
s203: the fan is started and stopped according to the temperature T of the constant-temperature chamber and the start and stop point;
s204: calculating the temperature rise rate L during shutdown, and comparing the value of L with a set value L0: if L is less than L0, the constant-temperature chamber control mode is changed into a stable operation mode, and a control mode in a stable state is executed; otherwise, the process returns to step S203.
2. The control method of the constant temperature compartment of the refrigerator according to claim 1, wherein the heat exchanger damper is arranged at an inlet of the first air duct, and is opposite to an inlet of the phase change cold storage heat exchanger; the air mixing damper is arranged at the inlet of the second air duct.
3. The control method of the constant temperature compartment of the refrigerator according to claim 1, wherein the supply air temperature sensor is disposed at a position where the supply air duct faces the fan; the plurality of air supply outlets are uniformly arranged on the air supply duct; the plurality of air return inlets are uniformly arranged on the air return duct.
4. The method as claimed in claim 1, wherein the phase change cold storage heat exchanger is composed of phase change material and evaporator coil.
5. The method as claimed in claim 1, wherein the adjusting the opening degree of the evaporator damper according to the difference between the supply air temperature Ts and the constant temperature setting Td is: adjusting the opening degree of an air door of the evaporator to ensure that the air supply temperature Ts of the constant-temperature compartment is 1-3 ℃ lower than the set temperature Td all the time;
the minimum difference T between the constant temperature chamber temperature T and the environment temperature Ta 1 ，T 1 Taking the mixture at 0-10 ℃;
the maximum difference value T between the constant temperature chamber temperature T and the environment temperature Ta 2 ，T 2 Taking the mixture to be 40-45 ℃;
setting the temperature Td of the constant-temperature chamber, wherein the Td is-5 ℃;
the set value t, t is 0-5 ℃.
6. The method of claim 1, wherein the constant temperature compartment of the refrigerator is controlled by a controller,
the set value K0 of the temperature reduction rate of the constant-temperature chamber is 0.3-0.6 ℃/min;
the set value L0 of the temperature rising and falling rate of the constant-temperature chamber is 0.4-0.8 ℃/min;
the fan is started and stopped according to the constant temperature room temperature T and the start-stop point, and the starting and stopping operations are as follows: the damper is opened when the constant temperature compartment temperature T is higher than the startup point temperature, and the damper is closed when the constant temperature compartment temperature T is lower than the shutdown point temperature.
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