CN215176143U - Refrigerator defrosting system and refrigerator - Google Patents
Refrigerator defrosting system and refrigerator Download PDFInfo
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- CN215176143U CN215176143U CN202120623140.XU CN202120623140U CN215176143U CN 215176143 U CN215176143 U CN 215176143U CN 202120623140 U CN202120623140 U CN 202120623140U CN 215176143 U CN215176143 U CN 215176143U
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Abstract
The utility model discloses a refrigerator defrost system and refrigerator relates to refrigerator defrosting field for improve the defrosting effect of refrigerator. The defrosting system of the refrigerator comprises a compressor, a condenser, a first heat exchanger and a second heat exchanger. The compressor is configured to compress a refrigerant. The fluid inlet of the condenser is in communication with the fluid outlet of the compressor. A first branch and a second branch are arranged between the fluid inlet of the first heat exchanger and the fluid outlet of the condenser in parallel, the first branch is not provided with a throttling element, and the second branch is provided with a first throttling element; the fluid outlet of the first heat exchanger is in communication with the fluid inlet of the compressor. A third branch and a fourth branch are arranged between the fluid inlet of the second heat exchanger and the fluid outlet of the condenser in parallel, the third branch is not provided with a throttling element, and the fourth branch is provided with a second throttling element; the fluid outlet of the second heat exchanger is in communication with the fluid inlet of the compressor. The technical scheme ensures that the frost layer is integrally peeled off and the defrosting efficiency is high.
Description
Technical Field
The utility model relates to a refrigerator defrosting field, concretely relates to refrigerator defrost system and refrigerator.
Background
Refrigerators are used to freeze and refrigerate food. In the related art, a refrigerator includes a freezing chamber, a refrigerating chamber, and an evaporating chamber. The evaporation chamber is located at the rear side of the refrigerator. The evaporation chamber is used for generating cold air. The evaporating chamber is communicated with the freezing chamber and the refrigerating chamber through respective air ducts. The evaporator is disposed in the evaporation chamber. In the related art, a defrosting mode of a refrigerator is electric heating defrosting, an electric heating pipe is arranged below an evaporator, and natural convection is formed by heating air and heat radiation of the electric heating pipe is used for defrosting the evaporator.
The inventor finds that at least the following problems exist in the prior art: the defrosting is carried out by utilizing an electric heating mode, the defrosting efficiency is low, the defrosting time is long, the defrosting power consumption is high, the temperature rise of a freezing chamber is high, and the normal use of the refrigerator is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a refrigerator defrost system and refrigerator for improve the defrosting effect of refrigerator.
An embodiment of the utility model provides a refrigerator defrost system, include:
a compressor configured to compress a refrigerant;
a condenser having a fluid inlet in communication with a fluid outlet of the compressor;
a first branch and a second branch are arranged between a fluid inlet of the first heat exchanger and a fluid outlet of the condenser in parallel, the first branch is not provided with a throttling element, and the second branch is provided with a first throttling element; a fluid outlet of the first heat exchanger is communicated with a fluid inlet of the compressor; and
a third branch and a fourth branch are arranged between a fluid inlet of the second heat exchanger and a fluid outlet of the condenser in parallel, the third branch is not provided with a throttling element, and the fourth branch is provided with a second throttling element; the fluid outlet of the second heat exchanger is in communication with the fluid inlet of the compressor.
In some embodiments, a first one-way valve is disposed between the fluid outlet of the first heat exchanger and the fluid inlet of the compressor.
In some embodiments, a fluid outlet of the second heat exchanger and a fluid inlet of the compressor are provided with a second one-way valve.
In some embodiments, the refrigerator defrost system further comprises:
and the electromagnetic valve is provided with an inflow port and four outflow ports, the inflow port of the electromagnetic valve is communicated with the fluid outlet of the condenser, and the four outflow ports are communicated with the first branch, the second branch, the third branch and the fourth branch in a one-to-one correspondence manner.
In some embodiments, the refrigerator defrost system is configured to employ a bypass conduction mode of one of:
the first branch is connected, and the second branch, the third branch and the fourth branch are all disconnected; or, the fourth branch is turned on, and the first branch, the second branch and the third branch are all turned off; alternatively, the first and second electrodes may be,
the third branch circuit is connected, and the first branch circuit, the second branch circuit and the fourth branch circuit are all disconnected; or, the second branch is turned on, and the first branch, the third branch and the fourth branch are all turned off.
In some embodiments, a first one-way valve is disposed between the fluid outlet of the first heat exchanger and the fluid inlet of the compressor;
a fluid outlet of the second heat exchanger and a fluid inlet of the compressor are provided with second one-way valves;
the defrosting system of the refrigerator further comprises a solenoid valve, wherein the solenoid valve is provided with an inflow port and four outflow ports, the inflow port of the solenoid valve is communicated with the fluid outlet of the condenser, and the four outflow ports are communicated with the first branch, the second branch, the third branch and the fourth branch in a one-to-one correspondence manner;
wherein the refrigerator defrost system is configured to adopt a branch conduction mode of one of the following:
in a mode to defrost the first heat exchanger: a first flow outlet of the electromagnetic valve is communicated, the first one-way valve is opened, the second one-way valve is closed, the first branch is communicated, and the second branch, the third branch and the fourth branch are all disconnected, so that the refrigerant flows to the first heat exchanger through the first branch; or a fourth outflow port of the electromagnetic valve is communicated, the second one-way valve is opened, the first one-way valve is closed, the fourth branch is communicated, and the first branch, the second branch and the third branch are all disconnected, so that the refrigerant flows to the second heat exchanger through the fourth branch; alternatively, the first and second electrodes may be,
in a mode to defrost the second heat exchanger: a third flow outlet of the electromagnetic valve is communicated, the second one-way valve is opened, the first one-way valve is closed, the third branch is communicated, and the first branch, the second branch and the fourth branch are all disconnected, so that a refrigerant flows to the second heat exchanger through the third branch; or a second outlet of the solenoid valve is connected, the second branch is connected, and the first branch, the third branch and the fourth branch are all disconnected, so that the refrigerant flows to the first heat exchanger through the second branch.
In some embodiments, the first throttling element comprises a capillary tube and/or an electronic expansion valve; and/or the second throttling element comprises a capillary tube and/or an electronic expansion valve.
The embodiment of the utility model provides a refrigerator is still provided, include the utility model discloses the refrigerator defrost system that any technical scheme provided.
The refrigerator defrosting system provided by the technical scheme is also provided with the first heat exchanger and the second heat exchanger outside the condenser. In the normal cooling mode, at least one of the first heat exchanger and the second heat exchanger is used for realizing cooling of the refrigerator. Under the defrosting mode, through the operating condition of control first heat exchanger and second heat exchanger, realize utilizing the principle of sublimating to defrosting in arbitrary one in first heat exchanger and the second heat exchanger. The frost layer on the surface of the heat exchanger to be defrosted forms a certain absolute humidity difference with the ambient air, the temperature of the frost layer reaches a certain condition, the frost layer is sublimated, and when the temperature of the frost layer decreases gradually from the root to the outside, the frost layer can be sublimated from the root and is peeled off integrally. The defrosting time is shortened and the defrosting efficiency is improved by adopting the defrosting system of the refrigerator.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a schematic diagram of a defrosting system for a refrigerator according to some embodiments of the present invention;
fig. 2 is a schematic flow chart of a defrosting method for a refrigerator according to other embodiments of the present invention;
FIG. 3 is a detailed schematic view of the defrosting step of the first heat exchanger of FIG. 2;
fig. 4 is a detailed process diagram of defrosting the second heat exchanger in fig. 2.
Detailed Description
The technical solution provided by the present invention will be explained in more detail with reference to fig. 1 to 4.
Referring to fig. 1, an embodiment of the present invention provides a defrosting system for a refrigerator, including a compressor 1, a condenser 2, a first heat exchanger 3, and a second heat exchanger 4. The compressor 1 is configured to compress a refrigerant. The fluid inlet of the condenser 2 communicates with the fluid outlet of the compressor 1. A first branch 5 and a second branch 6 are arranged in parallel between the fluid inlet of the first heat exchanger 3 and the fluid outlet of the condenser 2, the first branch 5 is not provided with a throttling element, and the second branch 6 is provided with a first throttling element 7. The fluid outlet of the first heat exchanger 3 communicates with the fluid inlet of the compressor 1. A third branch 8 and a fourth branch 9 are arranged between the fluid inlet of the second heat exchanger 4 and the fluid outlet of the condenser 2 in parallel, the third branch 8 is not provided with a throttling element, and the fourth branch 9 is provided with a second throttling element 10; the fluid outlet of the second heat exchanger 4 communicates with the fluid inlet of the compressor 1.
The compressor 1 may have an existing structure, and the compressor 1 is used to compress a refrigerant and change the form, temperature, and pressure of the refrigerant.
The condenser 2 may also adopt an existing structure, and the condenser 2 receives the high-temperature and high-pressure gaseous refrigerant output by the compressor 1.
The refrigerator includes three chambers of a freezing chamber, a refrigerating chamber and an evaporating chamber. The first heat exchanger 3 and the second heat exchanger 4 are both installed in the evaporation chamber. The first heat exchanger 3 and the second heat exchanger 4 are arranged in two branches. Upstream of the first heat exchanger 3 are a first branch 5 and a second branch 6. The first branch 5 and the second branch 6 may either be conducting or both non-conducting. The first branch 5 is not provided with a throttling element, if the refrigerant output by the condenser 2 enters the first heat exchanger 3 through the first branch 5, the first heat exchanger 3 has the same function as the condenser 2 at the moment, and the refrigerant is also subjected to condensation heat exchange in the first heat exchanger 3. If the refrigerant output from the condenser 2 enters the first heat exchanger 3 via the second branch 6, the first heat exchanger 3 functions as an evaporator since the second branch 6 is provided with the first throttling element 7.
Upstream of the second heat exchanger 4 are a third branch 8 and a fourth branch 9. The third branch 8 and the fourth branch 9 may be either conductive or both non-conductive. The third branch 8 is not provided with a throttling element, if the refrigerant output by the condenser 2 enters the second heat exchanger 4 through the third branch 8, the second heat exchanger 4 has the same function as the condenser 2 at the moment, and the refrigerant is also subjected to condensation heat exchange in the second heat exchanger 4. If the refrigerant output from the condenser 2 enters the second heat exchanger 4 via the fourth branch 9, the second heat exchanger 4 functions as an evaporator since the fourth branch 9 is provided with the second throttling element 10.
Overall, the first branch 5, the second branch 6, the third branch 8 and the fourth branch 9 are four independent branches.
The defrosting system of the refrigerator has two working states of refrigeration and defrosting.
In the normal refrigeration cycle, both the first heat exchanger 3 and the second heat exchanger 4 may be used as evaporators, or alternatively may be used as evaporators. When the refrigerating requirement of the refrigerator is large, the first heat exchanger 3 and the second heat exchanger 4 are used simultaneously. When the refrigerating requirement of the refrigerator is small, the first heat exchanger 3 and the second heat exchanger 4 are alternatively used.
Taking as an example that the first heat exchanger 3 and the second heat exchanger 4 are used as evaporators at the same time. The refrigerant output from the condenser 2 is divided into two branches, one of which enters the first heat exchanger 3 through the second branch 6, and the other of which enters the second heat exchanger 4 through the fourth branch 9. Then, the refrigerant output through the first heat exchanger 3 and the second heat exchanger 4 flows back to the compressor 1.
Taking the example where the first heat exchanger 3 and the second heat exchanger 4 are used alternatively as evaporators, the other may not be used. Taking the first heat exchanger 3 in the use state as an example, the branch in which the second heat exchanger 4 is located is disconnected. All the refrigerant output from the condenser 2 enters the first heat exchanger 3 through the second branch 6, and the refrigerant output from the first heat exchanger 3 flows back to the compressor 1.
Referring to fig. 1, in some embodiments, a first one-way valve 11 is provided between the fluid outlet of the first heat exchanger 3 and the fluid inlet of the compressor 1. The first check valve 11 allows the refrigerant to flow from the first heat exchanger 3 to the compressor 1 in one direction without flowing in the reverse direction.
Referring to fig. 1, in some embodiments, the fluid outlet of the second heat exchanger 4 and the fluid inlet of the compressor 1 are provided with a second one-way valve 12. The second check valve 12 allows the refrigerant to flow from the second heat exchanger 4 to the compressor 1 in one direction without flowing in the reverse direction.
Referring to fig. 1, in some embodiments, the refrigerator defrosting system further includes a solenoid valve 13, the solenoid valve 13 having an inflow port and four outflow ports, the inflow port of the solenoid valve 13 being communicated with the fluid outlet of the condenser 2, and the four outflow ports being communicated with the first branch 5, the second branch 6, the third branch 8, and the fourth branch 9 in a one-to-one correspondence. The four outlet ports of the solenoid valve 13 are respectively an outlet port a, an outlet port b, an outlet port c, and an outlet port d. The outlet a communicates with the first branch passage 5. The outflow opening b communicates correspondingly with the second branch 6. The outflow opening c communicates correspondingly with the third branch 8. The outflow port d communicates correspondingly with the fourth branch 9.
After the electromagnetic valve 13 is arranged, the on-off control of the first branch 5, the second branch 6, the third branch 8 and the fourth branch 9 is realized by controlling the valve position of the electromagnetic valve 13. The term "pass" means that the refrigerant in the branch can flow from the upstream of the branch to the downstream through the branch; by "off" it is meant that the refrigerant in the branch cannot flow from upstream of the branch through the branch to downstream.
In some embodiments, the first throttling element 7 comprises a capillary tube and/or an electronic expansion valve; and/or the second restriction element 10 comprises a capillary tube and/or an electronic expansion valve. The throttle effect can be adjusted by adjusting the opening of the electronic expansion valve.
Referring to fig. 1, the branch conduction mode of the defrosting system of the refrigerator is described as follows:
the first method comprises the following steps: the first branch 5 is on and the second 6, third 8 and fourth 9 branches are off. In this way, the refrigerant between the first heat exchanger 3 and the condenser 2 does not flow through the throttling element, and the frost temperature outside the first heat exchanger 3 can be increased. The first conduction state of the branch corresponds to the first step of defrosting the first heat exchanger 3. How the first conducting state of the branch is realized is described below: the first outlet a of the solenoid valve 13 is opened, the first check valve 11 is opened, and the second check valve 12 is closed.
And the second method comprises the following steps: the fourth branch 9 is on and the first, second and third branches 5, 6, 8 are all off. In this communication mode, the first heat exchanger 3 does not operate, and the second heat exchanger 4 functions as an evaporator to reduce the humidity of the environment where the frost layer outside the first heat exchanger 3 is located.
The first conduction state of the branch corresponds to the second step of defrosting the first heat exchanger 3.
How the second conducting state of the branch is achieved is described below: the fourth outlet d of the solenoid valve 13 is opened, the second check valve 12 is opened, and the first check valve 11 is closed.
And the third is that: the third branch 8 is on, and the first branch 5, the second branch 6 and the fourth branch are off. In this way, the refrigerant between the second heat exchanger 4 and the condenser 2 does not flow through the throttling element, and the frost temperature outside the second heat exchanger 4 can be increased. The first conduction state of the branch corresponds to the first step of defrosting the second heat exchanger 4. How the third conducting state of the branch is achieved is described below: the third outlet c of the solenoid valve 13 is on, and the fourth outlet d of the solenoid valve 13 is off. The second check valve 12 is opened and the first check valve 11 is closed.
And fourthly: the second branch 6 is on and the first, third and fourth branches 5, 8, 9 are off. In this communication mode, the second heat exchanger 4 does not operate, and the first heat exchanger 3 acts as an evaporator to reduce the humidity of the environment in which the frost layer outside the second heat exchanger 4 is located. The first conduction state of the branch corresponds to the second step of defrosting the second heat exchanger 4. How the fourth conducting state of the branch is achieved is described below: the second outlet b of the solenoid valve 13 is open. The first outflow port a of the solenoid valve 13 is opened. The first check valve 11 is opened and the second check valve 12 is closed.
An embodiment of the utility model provides a refrigerator, include the utility model discloses the refrigerator defrost system that any technical scheme provided.
Referring to fig. 2, an embodiment of the present invention provides a defrosting method for a refrigerator, which is adopted in the present invention, wherein the defrosting system for a refrigerator provided by any one of the technical solutions is implemented, and the method includes the following steps:
and S100, judging whether the first heat exchanger 3 and the second heat exchanger 4 of the refrigerator meet defrosting conditions or not.
The first heat exchanger 3 and the second heat exchanger 4 each satisfy the condition of defrosting, and do not defrost at the same time. The defrosting is started when the defrosting condition is met. The defrosting condition may be set as an operation time of the compressor 1 of the refrigerator, for example, after the compressor 1 of the refrigerator is continuously allowed for 10 to 12 hours, one of the first heat exchanger 3 and the second heat exchanger 4 enters a defrosting process, and after the previous defrosting is completed, the next heat exchanger is defrosted.
Before step S100, the method further includes: at least one of the first heat exchanger 3 and the second heat exchanger 4 is used as an evaporator to achieve refrigeration of the refrigerator. The refrigerating requirements of the refrigerating chamber and the freezing chamber of the refrigerator are related to the working states of the first heat exchanger 3 and the second heat exchanger 4, and the first heat exchanger 3 and the second heat exchanger 4 work if the energy required by the refrigerating chamber and the freezing chamber is large. The refrigerating chamber and the freezing chamber require less energy, and at least one of the first heat exchanger 3 and the second heat exchanger 4 operates.
Step S200, if the first heat exchanger 3 meets the defrosting condition, increasing the frost layer temperature outside the first heat exchanger 3, and reducing the humidity of the environment where the first heat exchanger 3 is located, so as to defrost the first heat exchanger 3. If the second heat exchanger 4 meets the defrosting condition, the temperature of the frost layer outside the second heat exchanger 4 is increased, and the humidity of the environment where the second heat exchanger 4 is located is reduced, so that the second heat exchanger 4 is defrosted.
Referring to fig. 3, in some embodiments, if a defrosting of the first heat exchanger 3 is required, the step S200 specifically includes the following steps:
step S211, if the first heat exchanger 3 meets the defrosting condition, the first branch 5 at the upstream of the first heat exchanger 3 is turned on, and the second branch 6, the third branch 8 and the fourth branch 9 are all turned off, so as to increase the frost layer temperature on the first heat exchanger 3.
After the first branch 5 is conducted, the refrigerant output by the compressor 1 directly enters the first heat exchanger 3 through the first branch 5, and at this time, the refrigerant is also condensed in the first heat exchanger 3. The refrigerant carries out sensible heat exchange in the first heat exchanger 3, and carries out sensible heat heating on the frost layer on the surface of the first heat exchanger 3. The temperature of the frost layer is higher at the side close to the pipe fins and lower at the side far away from the frost layer, and the temperature difference of the frost layer formed by the whole frost layer is gradually reduced from the root to the outside.
Step S212 determines whether the temperature of the heated frost layer on the first heat exchanger 3 reaches a set value.
The temperature of the frost layer may specifically be the root temperature of the frost layer, i.e. the temperature of the lowermost layer of the frost layer. The set value is, for example, from-10 ℃ to-5 ℃. When the temperature of the frost layer at the root of the defrosting evaporator is higher than the set value, it indicates that the temperature condition required for defrosting is met, and at this time, the frost layer is not heated any more, but the humidity of the ambient temperature where the frost layer is located, that is, the humidity of the environment where the first heat exchanger 3 is located is changed.
Step S213, if the frost layer temperature outside the first heat exchanger 3 reaches the set value, the fourth branch 9 upstream of the second heat exchanger 4 is turned on, and the first branch 5, the second branch 6, and the third branch 8 are all turned off, so as to reduce the humidity of the environment where the first heat exchanger 3 is located.
The fourth branch 9 is conducting and the second heat exchanger 4 now functions as an evaporator. The second heat exchanger 4 absorbs heat through evaporation to provide cold for the evaporation chamber, and at the moment, because the second heat exchanger 4 refrigerates, the surfaces of the tube fins of the second heat exchanger 4 continuously frost, the humidity inside the evaporation chamber continuously decreases, and thus the absolute humidity difference of the frost layer ambient air of the first heat exchanger 3 is continuously reduced. This process is continued until the absolute humidity meets the humidity required for defrosting of the frost layer of the first heat exchanger 3.
When the absolute humidity difference of the air around the frost layer reaches a certain condition, the sensible heat of the frost layer is heated to a certain value, and the temperature difference of the defrosting evaporator decreases gradually from the root to the outside, the frost layer can start to sublimate from the root, and the frost layer on the evaporator can integrally fall off after the root frost layer is sublimated under the action of gravity.
Referring to fig. 4, in some embodiments, if it is the second heat exchanger 4 that needs defrosting, the step S200 specifically includes the following steps:
step S221, if the second heat exchanger 4 meets the defrosting condition, the third branch 8 at the upstream of the second heat exchanger 4 is turned on, and the first branch 5, the second branch 6, and the fourth branch 9 are all turned off, so as to increase the frost layer temperature on the second heat exchanger 4.
The third branch 8 is not provided with a throttling element, and the refrigerant output by the condenser 2 directly enters the second heat exchanger 4 through the third branch 8. At this time, the second heat exchanger 4 and the condenser 2 act in the same manner, and the refrigerant is also condensed in the second heat exchanger 4. The refrigerant carries out sensible heat exchange in the second heat exchanger 4, and carries out sensible heat heating on a frost layer on the surface of the second heat exchanger 4. The temperature of the frost layer is higher at the side close to the pipe fins and lower at the side far away from the frost layer, and the temperature difference of the frost layer formed by the whole frost layer is gradually reduced from the root to the outside.
Step S222, determining whether the temperature of the frost layer heated by the second heat exchanger 4 reaches a set value.
The temperature of the frost layer may specifically be the root temperature of the frost layer, i.e. the temperature of the lowermost layer of the frost layer. The set value is, for example, from-10 ℃ to-5 ℃. When the temperature of the frost layer at the root of the defrosting evaporator is higher than the set value, it indicates that the temperature condition required for defrosting is met, and at this time, the frost layer is not heated any more, but the humidity of the ambient temperature of the frost layer, that is, the humidity of the environment where the second heat exchanger 4 is located, is changed.
Step S223, if the frost layer temperature outside the second heat exchanger 4 reaches the set value, the second branch 6 upstream of the first heat exchanger 3 is turned on, and the first branch 5, the third branch 8, and the fourth branch 9 are all turned off, so as to reduce the humidity of the environment where the second heat exchanger 4 is located.
The second branch 6 is conducting, in which case the first heat exchanger 3 acts as an evaporator. The first heat exchanger 3 absorbs heat in an evaporation mode to provide cold for the evaporation chamber, and at the moment, because the first heat exchanger 3 refrigerates, the surface of the tube fin of the first heat exchanger 3 continuously frosts, the humidity inside the evaporation chamber is continuously reduced, and therefore the absolute humidity difference of the frost layer ambient air of the second heat exchanger 4 is continuously reduced. This process is continued until the absolute humidity meets the humidity required for defrosting of the frost layer of the second heat exchanger 4.
When the absolute humidity difference of the air around the frost layer reaches a certain condition, the sensible heat of the frost layer is heated to a certain value, and the temperature difference of the defrosting evaporator decreases gradually from the root to the outside, the frost layer can start to sublimate from the root, and the frost layer on the evaporator can integrally fall off after the root frost layer is sublimated under the action of gravity.
Returning to fig. 2, in some embodiments, the refrigerator defrosting method further comprises the steps of:
and step S300, if the temperature of the refrigerant outlet of the first heat exchanger 3 is higher than a set value, the defrosting step of the first heat exchanger 3 is quitted. And if the refrigerant outlet temperature of the second heat exchanger 4 is higher than the set value, the defrosting step of the second heat exchanger 4 is quitted.
When the defrost step is exited, the first branch 5 and the third branch 8 are cut. The second branch 6 and the fourth branch 9 are either or both conductive as required.
Some specific embodiments are described in detail below with reference to fig. 1 to 4.
The refrigerator defrosting system comprises a first heat exchanger 3 and a second heat exchanger 4, and the states of a first branch 5, a second branch 6, a third branch 8 and a fourth branch 9 are controlled by the system, so that the temperature fluctuation of a freezing chamber and a refrigerating chamber of the refrigerator defrosting system in a defrosting mode can be improved while the defrosting is realized by utilizing sublimation.
Referring to fig. 1, the defrosting system of the refrigerator includes first and second heat exchangers 3 and 4, a first throttling element 7, a second throttling element 10, a first branch 5, and a third branch 8. The solenoid valve 13 has 4 outlet ports, in which an outlet port a communicates with the first branch 5, an outlet port b communicates with the second branch 6, an outlet port c communicates with the fourth branch 9, and an outlet port d communicates with the third branch 8, and the flow direction of the refrigerant can be controlled by controlling the opening and closing of the 4 outlet ports.
The defrosting system of the refrigerator comprises two modes: 1 normal refrigeration mode; defrost mode 2
(1) Normal cooling mode
When the refrigeration system is in a normal refrigeration mode, the branch corresponding to the outlet port a and the outlet port c of the electromagnetic valve 13 is closed, and the channels of the outlet port b and the outlet port d are opened. The refrigerant enters the condenser 2 through the compressor 1, and enters the first throttling element 7 and the second throttling element 10 for throttling through the outlet b and the outlet d in the electromagnetic valve 13 respectively; and then the first heat exchanger 3 and the second heat exchanger 4 are evaporated to absorb heat, and the first heat exchanger 3 and the second heat exchanger 4 jointly achieve the cold quantity required by the evaporation chamber. The first check valve 11 and the second check valve 12 control the flow direction of the refrigerant to be a single flow direction from the evaporator to the compressor 1, and the refrigerant finally returns to the compressor 1. Of course, the first heat exchanger 3 and the second heat exchanger 4 may alternatively operate as required.
(2) Defrost mode
When the system is in normal refrigeration mode operation and detects that a certain evaporator (assuming that the first heat exchanger 3 achieves defrosting conditions) achieves defrosting conditions, the whole refrigerator defrosting system enters a defrosting mode, the root frost layer temperature of the defrosting evaporator is detected, and the four outflow ports a, b, c and d of the electromagnetic valve 13 are determined to be opened and closed according to the root frost layer temperature value of the defrosting evaporator.
When it is detected that the temperature of the frost layer at the root of the defrosting evaporator is lower than the set value, the first branch 5 corresponding to the outflow opening a is opened, and the branches corresponding to the outflow openings b, c and d are all closed. The refrigerant flows to the first branch 5 corresponding to the outflow port a through the electromagnetic valve 13, and the refrigerant flows into the first heat exchanger 3 through the first branch 5 to perform sensible heat exchange, so as to perform sensible heat heating on the frost layer on the surface of the first heat exchanger 3. Meanwhile, the temperature of the frost layer is higher at the side close to the pipe fins, and is lower at the side far away from the frost layer, so that the temperature difference that the temperature of the frost layer is gradually reduced from the root to the outside is formed.
When the temperature of the frost layer at the root of the defrosting evaporator is higher than a set value, the set value is-5 ℃, for example, the branches corresponding to the outflow ports a, b and c are closed, only the fourth branch 9 corresponding to the outflow port d of the electromagnetic valve 13 is opened, and the refrigerant flows into the second heat exchanger 4 through the fourth branch 9 to be evaporated and absorbed, so that the cold energy is provided for the evaporation chamber. At this time, the second heat exchanger 4 cools, the surfaces of the tube fins continue to frost, the humidity inside the evaporation chamber continuously decreases, and the absolute humidity difference of the air around the frost layer of the defrosting evaporator continuously decreases.
When the absolute humidity difference of the air around the frost layer reaches a certain condition, the sensible heat of the frost layer is heated to a certain value, and the temperature difference of the defrosting evaporator decreases gradually from the root to the outside, the frost layer can start to sublimate from the root, and the frost layer on the evaporator can integrally fall off after the root frost layer is sublimated under the action of gravity.
When the condition that the first heat exchanger 3 is defrosted is detected, the first branch 5 corresponding to the outlet a of the electromagnetic valve 13 and the third branch 8 corresponding to the outlet c are closed, the second branch 6 corresponding to the outlet b and the fourth branch 9 corresponding to the outlet d are opened at the same time, the system defrosting mode is closed, and the normal refrigeration mode is entered.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments, but such modifications or substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. A defrost system for a refrigerator, comprising:
a compressor (1) configured to compress a refrigerant;
a condenser (2), a fluid inlet of the condenser (2) being in communication with a fluid outlet of the compressor (1);
a first heat exchanger (3), wherein a first branch (5) and a second branch (6) are arranged between a fluid inlet of the first heat exchanger (3) and a fluid outlet of the condenser (2) in parallel, the first branch (5) is not provided with a throttling element, and the second branch (6) is provided with a first throttling element (7); the fluid outlet of the first heat exchanger (3) is communicated with the fluid inlet of the compressor (1); and
a third branch (8) and a fourth branch (9) are arranged between a fluid inlet of the second heat exchanger (4) and a fluid outlet of the condenser (2) in parallel, the third branch (8) is not provided with a throttling element, and the fourth branch (9) is provided with a second throttling element (10); the fluid outlet of the second heat exchanger (4) is communicated with the fluid inlet of the compressor (1).
2. Defrost system for a refrigerator according to claim 1, characterized in that a first one-way valve (11) is arranged between the fluid outlet of the first heat exchanger (3) and the fluid inlet of the compressor (1).
3. Defrost system for a refrigerator according to claim 1, characterized in that the fluid outlet of the second heat exchanger (4) and the fluid inlet of the compressor (1) are provided with a second one-way valve (12).
4. The defrosting system for a refrigerator of claim 1, further comprising:
and the electromagnetic valve (13) is provided with an inflow port and four outflow ports, the inflow port of the electromagnetic valve (13) is communicated with the fluid outlet of the condenser (2), and the four outflow ports are communicated with the first branch (5), the second branch (6), the third branch (8) and the fourth branch (9) in a one-to-one correspondence manner.
5. The refrigerator defrost system of any one of claims 1-4 configured to bypass one of:
the first branch (5) is on, and the second branch (6), the third branch (8) and the fourth branch (9) are off; or the fourth branch (9) is on, and the first branch (5), the second branch (6) and the third branch (8) are all off; alternatively, the first and second electrodes may be,
the third branch (8) is on, and the first branch (5), the second branch (6) and the fourth branch are off; or the second branch (6) is on, and the first branch (5), the third branch (8) and the fourth branch (9) are all off.
6. Defrost system for a refrigerator according to claim 1, characterized in that a first one-way valve (11) is arranged between the fluid outlet of the first heat exchanger (3) and the fluid inlet of the compressor (1);
a second one-way valve (12) is arranged between the fluid outlet of the second heat exchanger (4) and the fluid inlet of the compressor (1);
the refrigerator defrosting system further comprises a solenoid valve (13), wherein the solenoid valve (13) is provided with an inflow port and four outflow ports, the inflow port of the solenoid valve (13) is communicated with the fluid outlet of the condenser (2), and the four outflow ports are communicated with the first branch (5), the second branch (6), the third branch (8) and the fourth branch (9) in a one-to-one correspondence manner;
wherein the refrigerator defrost system is configured to adopt a branch conduction mode of one of the following:
in a mode for defrosting the first heat exchanger (3): a first outflow port (a) of the electromagnetic valve (13) is communicated, the first check valve (11) is opened, the second check valve (12) is closed, the first branch (5) is communicated, and the second branch (6), the third branch (8) and the fourth branch (9) are all disconnected, so that the refrigerant flows to the first heat exchanger (3) through the first branch (5); or, a fourth outlet (d) of the solenoid valve (13) is opened, the second check valve (12) is opened, the first check valve (11) is closed, the fourth branch (9) is opened, and the first branch (5), the second branch (6) and the third branch (8) are all disconnected, so that the refrigerant flows to the second heat exchanger (4) through the fourth branch (9); alternatively, the first and second electrodes may be,
in a mode for defrosting the second heat exchanger (4): a third outflow port (c) of the electromagnetic valve (13) is communicated, the second check valve (12) is opened, the first check valve (11) is closed, the third branch (8) is communicated, and the first branch (5), the second branch (6) and the fourth branch are all disconnected, so that the refrigerant flows to the second heat exchanger (4) through the third branch (8); or a second outlet (b) of the electromagnetic valve (13) is communicated, the first check valve (11) is opened, the second check valve (12) is closed, the second branch (6) is communicated, and the first branch (5), the third branch (8) and the fourth branch (9) are all disconnected, so that the refrigerant flows to the first heat exchanger (3) through the second branch (6).
7. Defrost system for a refrigerator according to any of the claims 1-4, characterized in that the first throttle element (7) comprises a capillary tube and/or an electronic expansion valve; and/or the second throttling element (10) comprises a capillary tube and/or an electronic expansion valve.
8. A refrigerator comprising the defrosting system for a refrigerator according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202120623140.XU CN215176143U (en) | 2021-03-26 | 2021-03-26 | Refrigerator defrosting system and refrigerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120623140.XU CN215176143U (en) | 2021-03-26 | 2021-03-26 | Refrigerator defrosting system and refrigerator |
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| CN215176143U true CN215176143U (en) | 2021-12-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112880219A (en) * | 2021-03-26 | 2021-06-01 | 珠海格力电器股份有限公司 | Refrigerator defrosting system, refrigerator and refrigerator defrosting method |
| CN114322332A (en) * | 2022-01-20 | 2022-04-12 | 青岛酒店管理职业技术学院 | Solar collector system for melting ice |
| CN114322333A (en) * | 2022-01-20 | 2022-04-12 | 青岛酒店管理职业技术学院 | Solar water heater system with auxiliary heating function |
-
2021
- 2021-03-26 CN CN202120623140.XU patent/CN215176143U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112880219A (en) * | 2021-03-26 | 2021-06-01 | 珠海格力电器股份有限公司 | Refrigerator defrosting system, refrigerator and refrigerator defrosting method |
| CN114322332A (en) * | 2022-01-20 | 2022-04-12 | 青岛酒店管理职业技术学院 | Solar collector system for melting ice |
| CN114322333A (en) * | 2022-01-20 | 2022-04-12 | 青岛酒店管理职业技术学院 | Solar water heater system with auxiliary heating function |
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