CN109869951B - Refrigeration system, refrigerator and control method - Google Patents
Refrigeration system, refrigerator and control method Download PDFInfo
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- CN109869951B CN109869951B CN201811637078.9A CN201811637078A CN109869951B CN 109869951 B CN109869951 B CN 109869951B CN 201811637078 A CN201811637078 A CN 201811637078A CN 109869951 B CN109869951 B CN 109869951B
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Abstract
The invention discloses a refrigerating system, a refrigerator and a control method. The refrigerating system comprises a compressor, a condenser, a throttling device and an evaporator, wherein the throttling device is arranged between a second end of the condenser and a first end of the evaporator. The invention has the advantages of uniform defrosting, small temperature rise in the storage chamber, quick defrosting and low power consumption.
Description
Technical Field
The invention relates to the technical field of household appliance manufacturing, in particular to a refrigerating system and a control method thereof, and also relates to a refrigerator with the refrigerating system and a defrosting control method thereof.
Background
The evaporator is used as an indispensable component of a refrigerator refrigerating system, and the surface of the evaporator gradually frosts after a certain time due to low temperature in the operation process. When the frost layer reaches a certain thickness, the heat exchange efficiency of the evaporator is affected, and if the frost layer is not melted in time, the refrigerating capacity of the refrigerator is greatly weakened or even is not refrigerated, so that the complaint of users is caused. Therefore, in order to ensure the refrigeration reliability of the refrigerator, the evaporator needs to be defrosted in time.
Refrigerators on the market may be classified into direct-cooling refrigerators and air-cooling refrigerators.
At present, a direct-cooling refrigerator generally adopts an electric auxiliary heating wire to defrost, and an air-cooling refrigerator generally adopts a heating wire to electrify and heat to defrost, and the defrosting methods have the problems of large power consumption, incomplete defrosting due to uneven heating of an evaporator, overlarge chamber return temperature and the like.
Disclosure of Invention
In order to solve at least one of the above technical problems, an object of the present invention is to provide a refrigeration system and a control method thereof, and a refrigerator having the refrigeration system and a control method thereof.
In order to achieve one of the above objects, an embodiment of the present invention provides a refrigeration system, which includes a compressor, a condenser, a throttling device, an evaporator, a four-way valve and a three-way valve, wherein the throttling device is disposed between a second end of the condenser and a first end of the evaporator, the four-way valve includes a second valve outlet, a valve inlet communicated with an outlet end of the compressor, a valve two-way port communicated with the first end of the condenser, and a first valve outlet communicated with a second end of the evaporator, and the three-way valve includes a valve outlet communicated with an inlet end of the compressor, a first valve inlet communicated with a second end of the evaporator, and a second valve inlet communicated with the second valve outlet.
As a further improvement of an embodiment of the present invention, the throttling device includes a first throttling unit and a second throttling unit disposed in parallel with the first throttling unit;
the first throttling unit comprises a first capillary tube and a first stop valve connected with the first capillary tube in series, and the first stop valve enables one-way conduction of a fluid path from the condenser to the evaporator through the first throttling unit.
As a further improvement of an embodiment of the present invention, the second throttle unit includes an electronic expansion valve.
As a further improvement of the embodiment of the present invention, the second throttling unit includes a second capillary tube and a second stop valve connected in series with the second capillary tube, the second capillary tube and the first capillary tube have different lengths and/or tube diameters, and the second stop valve makes a fluid path from the evaporator to the condenser through the second throttling unit conduct in one direction.
In order to achieve one of the above objects, an embodiment of the present invention further provides a control method of the refrigeration system, where the control method includes:
receiving a thickness setting signal;
judging a thickness interval corresponding to the thickness information in the thickness setting signal;
if the thickness information in the thickness setting signal corresponds to a first preset thickness interval, controlling the compressor to start, wherein the valve inlet is communicated with the first valve outlet, the valve dual-port is communicated with the second valve outlet, and the second valve inlet is communicated with the valve outlet;
if the thickness information in the thickness setting signal corresponds to a second preset thickness interval, controlling the valve inlet to be communicated with the valve dual-port, and controlling the first valve inlet to be communicated with the valve outlet;
the lower limit value of the first preset thickness interval is greater than the upper limit value of the second preset thickness interval.
As a further improvement of an embodiment of the present invention, the control method further includes:
receiving a temperature setting signal;
judging a temperature interval corresponding to temperature information in the temperature setting signal;
and if the temperature information in the temperature setting signal corresponds to a first preset temperature interval, controlling the compressor to start, communicating the valve inlet with the valve dual-port, and communicating the first valve inlet with the valve outlet.
In order to achieve one of the above objects, an embodiment of the present invention further provides a refrigerator, which further includes the refrigeration system and a storage compartment for obtaining cold from an evaporator of the refrigeration system.
As a further improvement of an embodiment of the present invention, the refrigerator further includes a control system connected to the refrigeration system and configured to control the refrigeration system to perform a refrigeration mode or a defrosting mode;
in the refrigeration mode, the valve inlet is communicated with the valve dual-port, the first valve inlet is communicated with the valve outlet, and the compressor, the condenser, the throttling device and the evaporator are sequentially communicated to form a first circulation path; in the defrosting mode, the valve inlet is communicated with the first valve outlet, the valve dual-port is communicated with the second valve outlet, the second valve inlet is communicated with the valve outlet, and the compressor, the evaporator, the throttling device and the condenser are sequentially communicated to form a second circulation path.
As a further improvement of an embodiment of the present invention, the control system includes:
the thickness sensor is arranged on the evaporator and acquires a thickness setting signal with ice layer thickness information on the evaporator;
the temperature sensor is arranged in the storage chamber and is used for acquiring a temperature setting signal with indoor temperature information of the storage chamber;
and the control unit is connected with the temperature sensor and the thickness sensor and controls the control system to execute a refrigeration mode or a defrosting mode according to the thickness setting signal and the temperature setting signal.
In order to achieve one of the above objects, an embodiment of the present invention further provides a control method of the refrigerator, where the control method includes:
receiving a thickness setting signal with ice layer thickness information on the evaporator and a temperature setting signal with indoor temperature information of the storage room;
judging whether the thickness information in the thickness setting signal corresponds to a first preset thickness interval or not; if so, controlling the compressor to start, communicating the valve inlet with the first valve outlet, communicating the valve dual-port with the second valve outlet, and communicating the second valve inlet with the valve outlet;
judging whether the thickness information in the thickness setting signal corresponds to a second preset thickness interval or not, and judging that the temperature information in the temperature setting signal corresponds to a second preset temperature interval; if any condition is met, controlling the valve inlet to be communicated with the valve dual-port, and controlling the first valve inlet to be communicated with the valve outlet;
the lower limit value of the first preset thickness interval is greater than the upper limit value of the second preset thickness interval.
Compared with the prior art, the invention has the following beneficial effects: (1) the refrigerating system does not need to be provided with an electric heating wire, so that the problems of high power consumption, large chamber temperature return, slow defrosting and the like caused by overheating for realizing the complete removal of a frost layer in the prior art are solved, the power consumed by refrigeration and defrosting is low, an evaporator of the refrigerating system is uniformly heated during defrosting, the temperature return of a storage chamber is small when the refrigerating system performs defrosting, and the defrosting on the evaporator is fast; (2) the mode that combines through frost layer thickness and storing room indoor temperature controls the start-up and the stop of defrosting mode, can realize the defrosting, can avoid defrosting time overlength again, influences the indoor temperature of storing room, can effectively promote the refrigeration effect of refrigerator.
Drawings
FIG. 1 is a schematic diagram of a refrigeration system according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for controlling a control system according to thickness information according to an embodiment of the present invention;
FIG. 3 is a flowchart of a control method of the control system according to temperature information according to an embodiment of the present invention;
fig. 4 is a logic diagram of a defrosting control method of a refrigerator according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements or structures, these described elements should not be limited by these terms. These terms are only used to distinguish these descriptive objects from one another. For example, the first capillary may be referred to as the second capillary, and similarly the second capillary may also be referred to as the first capillary, without departing from the scope of the present application.
Referring to fig. 1, a specific embodiment of the refrigeration system of the present application is described, and in the present embodiment, the refrigeration system includes a compressor 1, a four-way valve 2, a condenser 3, a throttling device 4, an evaporator 5, and a three-way valve 6.
The compressor 1 serves to compress a refrigerant and output the compressed refrigerant to the outside through an outlet end thereof.
A throttle device 4 is arranged between the outlet end of the condenser 3 and the inlet end of the evaporator 5.
The four-way valve 2 comprises a valve inlet 21, a valve double-port 22, a first valve outlet 23 and a second valve outlet 24, the three-way valve 6 comprises a valve outlet 61, a first valve inlet 62 and a second valve inlet 63, the valve inlet 21 is communicated with the outlet end of the compressor 1, the valve double-port 22 is communicated with the inlet end of the condenser 3, the first valve outlet 23 is communicated with the outlet end of the evaporator 5, the second valve outlet 24 is communicated with the second valve inlet 63, the valve outlet 61 is communicated with the inlet end of the compressor 1, and the first valve inlet 62 is communicated with the outlet end of the evaporator 5.
Through the arrangement of the four-way valve 2 and the three-way valve 6, the refrigeration system can realize two different circulation paths.
For example, first, the valve inlet 21 is communicated with the valve two-way port 22, the first valve inlet 62 is communicated with the valve outlet 61, the compressor 1, the condenser 3, the throttling device 4 and the evaporator 5 are communicated in sequence to form a first circulation path, at this time, when the compressor 1 is started, the refrigeration system is in a refrigeration mode, refrigerant (such as freon) can be pressurized by the compressor 1 when in a gas state, flow into the condenser 3 through the four-way valve 2, and is condensed into a liquid state after being dissipated heat by the condenser 3; the liquid refrigerant then flows into the evaporator 5 after passing through the throttle device 4 and is vaporized due to the pressure being released from the compressor 1, causing the air around the evaporator 5 to be cooled; and the vaporized refrigerant is introduced into the compressor 1 again through the three-way valve 6 and thus circulated.
Secondly, the valve inlet 21 is communicated with the first valve outlet 23, the valve two-way port 22 is communicated with the second valve outlet 24, the second valve inlet 63 is communicated with the valve outlet 61, the compressor 1, the evaporator 5, the throttling device 4 and the condenser 2 are sequentially communicated to form a second circulation path, at this time, when the compressor 1 is started, the refrigerating system is in a defrosting mode, refrigerant (such as Freon) can be pressurized by the compressor 1 in a gas state, flows into the evaporator 5 through the four-way valve 2, dissipates heat through the evaporator 5 and is condensed into a liquid state; the liquid refrigerant then flows into the condenser 3 after passing through the throttle device 4 and is vaporized due to the pressure being released from the compressor 1, causing the air surrounding the condenser 3 to be cooled; and the vaporized refrigerant is introduced into the compressor 1 again through the three-way valve 6 and thus circulated.
Therefore, when the evaporator 5 is frosted too much due to the refrigeration mode of the refrigeration system, the refrigeration system can be switched to the defrosting mode, at the moment, the evaporator 5 dissipates heat, the frost layer on the evaporator 5 can be removed, the evaporator 5 is heated uniformly in the defrosting process, the frost layer on the surface of the evaporator 5 is removed uniformly and synchronously, the power consumption is low, the refrigeration system does not need to be additionally provided with an electric heating wire for defrosting, and the problems that in the prior art, the power consumption is high, the storage room is overheated due to overheating for removing all the frost layers, the defrosting is slow, and the like are avoided.
Preferably, the throttling device 4 comprises a first throttling unit 41 and a second throttling unit 42, the first throttling unit 41 and the second throttling unit 42 being arranged in parallel.
The first throttling unit 41 includes a first capillary tube 411 and a first stop valve 412 connected in series with the first capillary tube 411, and the first stop valve 412 allows a one-way communication of a fluid path from the condenser 2 to the evaporator 5 through the first throttling unit 41. That is, when the refrigeration system is in the cooling mode, the refrigerant at the condenser 2 may flow toward the evaporator 5 through the first throttling unit 41; however, when the refrigeration system is in the defrosting mode, the refrigerant at the inlet end of the evaporator 5 cannot flow toward the condenser 2 through the first throttling unit 41 due to the blocking action of the first cutoff valve 412.
And when the refrigeration system is in the defrosting mode, the refrigerant at the inlet end of the self-evaporator 3 may flow toward the condenser 2 through the second throttling unit 42 due to the conduction of the second throttling unit 42.
Meanwhile, according to a different implementation of the second throttling unit 42, when the refrigeration system is in the cooling mode, the refrigerant at the throttling device 4 has a different flow path:
for example, in the example of the figure, the second throttling unit 42 comprises only the second capillary tube, so that when the refrigeration system is in the cooling mode, the refrigerant at the condenser 2 can flow to the evaporator 5 through the first throttling unit 41 and can flow to the evaporator 5 through the second throttling unit 42, in which case the refrigeration rate of the evaporator 5 of the refrigeration system is faster.
For another example, in an alternative embodiment, the second throttling unit 42 may further add a second cut-off valve in the example of the figure, that is, the second throttling unit 42 may include the second capillary tube and a second cut-off valve connected in series with the second capillary tube, and the second cut-off valve makes a one-way conduction from the evaporator 5 to the fluid path of the condenser 2 through the second throttling unit 42. That is, when the refrigeration system is in the cooling mode, the refrigerant at the outlet end of the condenser 2 can flow only to the evaporator 5 through the first throttling unit 41 and cannot flow to the evaporator 5 through the second throttling unit 42 due to the blocking action of the second cutoff valve.
Of course, in a modified embodiment, the second throttling unit 42 may also be used to replace the second capillary tube (or the second capillary tube and the second stop valve) with an electronic expansion valve, and also may throttle the refrigerant, and at the same time, the opening degree of the electronic expansion valve itself may be controlled by the requirement of the refrigeration system, for example, when the refrigeration system is in the defrosting mode, the opening degree of the electronic expansion valve is the smallest, and the throttling effect is the largest, and at this time, the temperature in the evaporator 5 is the highest, and the defrosting speed is the fastest, and when the defrosting is too fast, the opening degree of the electronic expansion valve is increased, and the throttling effect is reduced, so as to avoid the drastic fluctuation of the temperature around the evaporator 5.
Preferably, the length and/or the pipe diameter of the second capillary tube is different from the first capillary tube 411, so that the defrosting requirement can be met. For example, the tube diameter of the first capillary 411 is larger than that of the second capillary, and compared with the case that the tube diameter of the first capillary 411 is equal to that of the second capillary, in the defrosting mode, a relatively small throttling effect can be maintained, so that the problem that the temperature of the condensation pressure in the evaporator 5 is too high and the temperature of the storage compartment in the middle of the following period is too fast due to severe fluctuation of the ambient temperature of the evaporator 5 is avoided, and the power consumption when the refrigeration mode is recovered is reduced.
Further, referring to fig. 2, the present invention also provides a control method of the refrigeration system, including:
receiving a thickness setting signal;
judging a thickness interval corresponding to the thickness information h in the thickness setting signal;
if the thickness information h in the thickness setting signal corresponds to a first preset thickness interval, controlling the compressor 1 to start, communicating the valve inlet 21 with the first valve outlet 23, communicating the valve two-way port 22 with the second valve outlet 24, communicating the second valve inlet 63 with the valve outlet 61, and sequentially communicating the compressor 1, the evaporator 5, the throttling device 4 and the condenser 2 to form a second circulation path, namely controlling the refrigeration system to start the defrosting mode;
if the thickness information h in the thickness setting signal corresponds to a second preset thickness interval, controlling the valve inlet 21 to be communicated with the valve dual-port 22, controlling the first valve inlet 62 to be communicated with the valve outlet 61, and sequentially communicating the compressor 1, the condenser 3, the throttling device 4 and the evaporator 5 to form a first circulation path;
the lower limit value of the first preset thickness interval is greater than the upper limit value of the second preset thickness interval.
In summary, that is, in the control method, the refrigeration system can be controlled to start the defrosting mode and be controlled not to start/end the defrosting mode according to the thickness information h. Of course, according to actual design requirements, the refrigeration system may be controlled to start the refrigeration mode under the condition that the thickness information h corresponds to a certain thickness interval.
Referring to fig. 3, further, the control method further includes:
receiving a temperature setting signal;
judging a temperature interval corresponding to temperature information t in the temperature setting signal;
if the temperature information t in the temperature setting signal corresponds to a first preset temperature interval, the compressor 1 is controlled to start, the valve inlet 21 is communicated with the valve two-way port 22, the first valve inlet 62 is communicated with the valve outlet 61, and the compressor 1, the condenser 3, the throttling device 4 and the evaporator 5 are sequentially communicated to form the first circulation path, that is, the refrigeration system is controlled to start the refrigeration mode.
In summary, in the control method, the refrigeration system may be controlled to start the refrigeration mode according to the temperature information t.
In combination with the above, that is, if the refrigeration system is in the defrosting mode, on one hand, the refrigeration system may be controlled to end the defrosting mode according to the thickness information h, and at the same time, the refrigeration system may be controlled to end the defrosting mode according to the temperature information t.
In addition, the invention also provides a refrigerator which applies the refrigerating system to provide cold energy, and the refrigerator can be a direct cooling type refrigerator or an air cooling type refrigerator or a refrigerator with both air cooling and direct cooling.
Specifically, the refrigerator comprises a plurality of storage compartments and the refrigerating system, wherein the storage compartments can be divided into a freezing compartment, a temperature changing compartment and a refrigerating compartment according to different storage temperatures. The freezer compartment typically requires a lower storage temperature, less severe than the warming compartment, while the refrigerator compartment typically has a higher storage temperature.
The storage compartment obtains cold from the evaporator 5 of the refrigeration system to achieve a lower storage temperature compared with the outside. As mentioned above, if the refrigerator is a direct-cooling refrigerator, the evaporator 5 is disposed in the storage compartment, and when the refrigeration system performs the refrigeration mode, the evaporator 5 directly exchanges heat with air in the storage compartment, so that the storage compartment obtains cold energy to cool; if the refrigerator is an air-cooled refrigerator, the evaporator 5 is arranged in an independent refrigerating bin, the refrigerating bin is communicated with the storage chamber through an air channel, when the refrigerating system executes the refrigerating mode, the evaporator 5 directly exchanges heat with air in the refrigerating bin, and low-temperature air in the refrigerating bin is sent into the storage chamber through the air channel, so that the storage chamber obtains cold energy to cool.
In one embodiment, the refrigerator further comprises a control system connected to the refrigeration system and configured to control the refrigeration system.
Specifically, the control system may control the interior of the refrigeration system to form the first circulation path, that is, the valve inlet 21 is communicated with the valve two-way port 22, the first valve inlet 62 is communicated with the valve outlet 61, and the compressor 1, the condenser 3, the throttling device 4 and the evaporator 5 are sequentially communicated to form the first circulation path; and at this moment, the control system can further control the compressor 1 to be started so that the refrigeration system executes the refrigeration mode, and the storage chamber obtains cold energy to cool down, so that refrigeration of the refrigerator is realized.
The control system can control the interior of the refrigeration system to form the second circulation path, namely the valve inlet 21 is communicated with the first valve outlet 23, the valve two-way port 22 is communicated with the second valve outlet 24, the second valve inlet 63 is communicated with the valve outlet 61, and the compressor 1, the evaporator 5, the throttling device 4 and the condenser 2 are sequentially communicated to form the second circulation path; and at this time, the control system may further control the compressor 1 to start, so that the refrigeration system executes the defrosting mode, and the frost layer on the evaporator 5 is removed, thereby defrosting the refrigerator.
In particular, in an embodiment, the control system comprises a thickness sensor, a temperature sensor and a control unit.
Wherein, the thickness sensor is arranged on the evaporator 5, especially on the most frosty part of the evaporator 5, for example, when the refrigerator is an air-cooled refrigerator, the thickness sensor is arranged at the part of the evaporator 5 adjacent to the air return opening of the air duct. The thickness sensor is used for acquiring a thickness setting signal with frost layer thickness information h on the evaporator 5, in short, the thickness sensor senses the frost layer thickness information h on the evaporator 5 and generates the thickness setting signal with the thickness information h. The thickness sensor may be specifically provided with a sensing structure that uses pressure, infrared, or the like as a trigger signal.
The control unit may specifically include various types of processors, memories, etc. of at least one chip on which an integrated circuit is formed.
The control unit is connected with the thickness sensor and can receive the thickness setting signal from the thickness sensor, and then the control system is controlled according to the thickness setting signal.
In particular, with reference to fig. 2, the control unit is configured to: judging a thickness interval corresponding to the thickness information h in the thickness setting signal; if the thickness information h in the thickness setting signal corresponds to the first preset thickness interval, controlling the refrigeration system to start the defrosting mode; if the thickness information h in the thickness setting signal corresponds to the second preset thickness interval, controlling the refrigeration system to form the first circulation path inside, that is, controlling the refrigeration system not to execute the defrosting mode (of course, at this time, the refrigeration system may start the refrigeration mode according to actual requirements). The lower limit value of the first preset thickness interval is greater than the upper limit value of the second preset thickness interval.
In this way, the control system can control the refrigeration system to start the defrosting mode and control the refrigeration system not to start/end the defrosting mode according to the thickness information h.
Further, the temperature sensor is arranged in the storage room and collects a temperature setting signal with the indoor temperature information t of the storage room. In short, that is, the temperature sensor senses the temperature information t in the storage compartment and generates a temperature setting signal with the temperature information t. The temperature sensor can be specifically provided with a sensing structure which takes infrared as a trigger signal.
The control unit is connected with the temperature sensor and can receive the temperature setting signal from the temperature sensor, and then the control system is controlled according to the temperature setting signal.
Specifically, referring to fig. 3, the control unit is configured to: judging a temperature interval corresponding to temperature information t in the temperature setting signal; and if the temperature information t in the temperature setting signal corresponds to the first preset temperature interval, controlling the refrigeration system to execute the refrigeration mode.
It can be understood that, usually, during most of the normal operation time of the refrigerator, the control unit controls the inside of the refrigeration system to form the first circulation path, and intermittently starts the compressor 1 according to the temperature interval corresponding to the temperature information t, so that the refrigeration system executes the refrigeration mode.
Further, referring to fig. 4, a control process of the control unit to the refrigeration system is illustrated, and in particular, a defrosting control method related to the refrigerator may specifically be:
receiving the thickness setting signal from the thickness sensor in a normal operation state of the refrigerator, and determining whether thickness information h in the thickness setting signal corresponds to the first preset thickness section (e.g., the first preset thickness section is [ h2, + ∞), that is, whether h is greater than or equal to h 2); if not (i.e., h < h 2), the refrigerator continues to keep normal operation, i.e., the refrigeration system is controlled to intermittently execute the refrigeration mode; if so (namely h is more than or equal to h 2), controlling the refrigeration system to start the defrosting mode;
next, during the defrosting mode of the refrigeration system, receiving the thickness setting signal from the thickness sensor and the temperature setting signal from the temperature sensor, and determining whether the thickness information h in the thickness setting signal corresponds to a second preset thickness interval (e.g., the second preset thickness interval is [0, h1], i.e., whether h is less than or equal to h 1), and determining that the temperature information t in the temperature setting signal corresponds to a second preset temperature interval (e.g., the second preset temperature interval is [ t1, + ∞), i.e., whether t is greater than or equal to t 1); if the two conditions are not met (namely h is more than h1 and t is less than t 1), controlling the refrigeration system to continuously maintain the defrosting mode; if any condition is satisfied (i.e., h ≦ h1 is satisfied and/or t ≧ t 1), the first circulation path is controlled to be formed inside the refrigeration system, i.e., the defrosting mode is ended to resume normal operation of the refrigerator, and of course, the compressor 1 may also be controlled to start up to enable the refrigeration system to start up the refrigeration mode.
Wherein the second preset temperature interval (corresponding to a condition for ending the defrosting mode) and the first preset temperature interval (corresponding to a condition for starting the cooling mode) may be set to be the same or different, and when the two are set to be different, the minimum value t1 of the second preset temperature interval is smaller than that of the first preset temperature interval.
Compared with the prior art, the invention has the following beneficial effects:
(1) the refrigerating system does not need to be provided with an electric heating wire, the refrigerating and defrosting consumption power is low, the evaporator 5 of the refrigerating system is uniformly heated when defrosting is carried out, the temperature of the storage chamber rises slightly when the refrigerating system carries out defrosting, and the evaporator 5 is quickly defrosted;
(2) the mode that combines through frost layer thickness and storing room indoor temperature controls the start-up and the stop of defrosting mode, can realize the defrosting, can avoid defrosting time overlength again, influences the indoor temperature of storing room, can effectively promote the refrigeration effect of refrigerator.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The detailed description set forth above is merely a specific description of possible embodiments of the present invention and is not intended to limit the scope of the invention, which is intended to include within the scope of the invention equivalent embodiments or modifications that do not depart from the technical spirit of the present invention.
Claims (4)
1. The refrigerator is characterized by comprising a refrigerating system, a control system and a storage compartment for acquiring cold energy from an evaporator of the refrigerating system;
the refrigeration system comprises a compressor, a condenser, a throttling device, an evaporator, a four-way valve and a three-way valve, wherein the throttling device is arranged between the second end of the condenser and the first end of the evaporator, the four-way valve comprises a second valve outlet, a valve inlet communicated with the outlet end of the compressor, a valve two-way port communicated with the first end of the condenser and a first valve outlet communicated with the second end of the evaporator, and the three-way valve comprises a valve outlet communicated with the inlet end of the compressor, a first valve inlet communicated with the second end of the evaporator and a second valve inlet communicated with the second valve outlet; the throttling device comprises a first throttling unit and a second throttling unit which is connected with the first throttling unit in parallel; the first throttling unit comprises a first capillary tube and a first stop valve connected with the first capillary tube in series, and the first stop valve enables the fluid path from the condenser to the evaporator to be communicated in a single direction through the first throttling unit; the second throttling unit comprises an electronic expansion valve;
the refrigeration system has the refrigeration mode and a defrosting mode;
in the cooling mode, the valve inlet is communicated with the valve two-way port, the first valve inlet is communicated with the valve outlet, the compressor, the condenser, the throttling device and the evaporator are sequentially communicated to form a first circulation path, and the refrigerant at the condenser can simultaneously flow to the evaporator through the first capillary tube and the electronic expansion valve;
in the defrosting mode, the valve inlet is communicated with the first valve outlet, the valve two-way port is communicated with the second valve outlet, the second valve inlet is communicated with the valve outlet, the compressor, the evaporator, the throttling device and the condenser are communicated in sequence to form a second circulation path, and refrigerant at the evaporator can pass through the electronic expansion valve and cannot flow to the condenser through the first capillary tube;
the control system comprises a thickness sensor arranged on the evaporator, a temperature sensor arranged in the storage compartment and a control unit, wherein the thickness sensor senses frost layer thickness information h on the evaporator, and the temperature sensor senses temperature information t in the storage compartment;
the control unit is used for:
when the thickness information h is larger than or equal to a first preset thickness h2, controlling the refrigeration system to start the defrosting mode;
during the defrosting mode, judging whether the thickness information h is less than or equal to a second preset thickness h1, h1 is less than or equal to h2, and judging whether the temperature information t is greater than or equal to a second preset temperature t 1; and if any one of the two conditions is met, controlling the refrigeration system to end the defrosting mode.
2. The refrigerator according to claim 1, wherein the control unit is further configured to:
during the defrosting mode, judging whether the thickness information h is less than or equal to a second preset thickness h1, h1 is less than or equal to h2, and judging whether the temperature information t is greater than or equal to a second preset temperature t 1; and if any one of the two conditions is met, controlling the refrigeration system to end the defrosting mode and start the refrigeration mode.
3. The refrigerator according to claim 1, wherein the control unit is further configured to: and if the temperature information t corresponds to a first preset temperature interval, controlling the refrigeration system to execute the refrigeration mode, wherein t1 is smaller than the minimum value of the first preset temperature interval.
4. A defrosting control method of a refrigerator according to claim 1, wherein the control method comprises the steps of:
receiving a thickness setting signal with the thickness information h of the frost layer on the evaporator and a temperature setting signal with the indoor temperature information t of the storage room;
judging whether the thickness information h in the thickness setting signal corresponds to a first preset thickness interval [ h2, + ∞); if yes, controlling the compressor to start, enabling the valve inlet to be communicated with the first valve outlet, enabling the valve two-way port to be communicated with the second valve outlet, enabling the second valve inlet to be communicated with the valve outlet, enabling the compressor, the evaporator, the throttling device and the condenser to be communicated in sequence to form a second circulation path, and enabling the refrigerant at the evaporator to pass through the electronic expansion valve but not to flow to the condenser through the first capillary tube;
judging whether the thickness information h in the thickness setting signal corresponds to a second preset thickness interval [0, h1], and judging whether the temperature information t in the temperature setting signal corresponds to a second preset temperature interval [ t1, + ∞ ]; if any condition is met, controlling the valve inlet to be communicated with the valve two-way port, controlling the first valve inlet to be communicated with the valve outlet, sequentially communicating the compressor, the condenser, the throttling device and the evaporator to form a first circulation path, and enabling the refrigerant at the condenser to flow to the evaporator through the first capillary tube and the electronic expansion valve at the same time;
wherein the lower limit h2 of the first predetermined thickness interval [ h2, + ∞ ] is greater than the upper limit h1 of the second predetermined thickness interval [0, h1 ].
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| WO2012123849A2 (en) * | 2011-03-11 | 2012-09-20 | EcoloBlue, Inc. | Systems and methods for potable water production |
| CN202221212U (en) * | 2011-08-31 | 2012-05-16 | 杭州华日电冰箱股份有限公司 | Intelligent defrosting computer refrigerator control system |
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| CN107036348A (en) * | 2017-05-17 | 2017-08-11 | 广东美的制冷设备有限公司 | Air conditioner, the defrosting control method of air conditioner and system |
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Address after: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Patentee before: Qingdao Haier Joint Stock Co.,Ltd. |