CN112113380A - Refrigeration system and control method thereof - Google Patents
Refrigeration system and control method thereof Download PDFInfo
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- CN112113380A CN112113380A CN202011111496.1A CN202011111496A CN112113380A CN 112113380 A CN112113380 A CN 112113380A CN 202011111496 A CN202011111496 A CN 202011111496A CN 112113380 A CN112113380 A CN 112113380A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003507 refrigerant Substances 0.000 claims abstract description 162
- 238000010257 thawing Methods 0.000 claims abstract description 89
- 238000010438 heat treatment Methods 0.000 claims abstract description 69
- 230000005674 electromagnetic induction Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 238000005485 electric heating Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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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
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
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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
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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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
- F25D29/00—Arrangement or mounting of control or safety devices
Abstract
The invention discloses a refrigeration system and a control method thereof. The refrigerating system comprises a refrigerant circulating flow path and a refrigerant heating module arranged on the refrigerant circulating flow path, wherein the refrigerant circulating flow path comprises a main flow path and a bypass branch, and the main flow path comprises a compressor, a condenser, a first throttling device and an evaporator which are sequentially arranged. The bypass branch is connected with the exhaust port of the compressor and the outlet of the first throttling device, and a control valve for controlling the on-off of the bypass branch is arranged on the bypass branch. After the refrigeration system enters the defrosting mode, the control valve is opened to enable the bypass branch to be communicated, the bypass branch does not pass through the first throttling device, the resistance of the bypass branch is smaller than that of the main flow path, a large amount of refrigerant flows to the evaporator through the bypass branch, and compared with the refrigerant flowing to the evaporator through the main flow path, the temperature of the refrigerant is higher, so that the defrosting efficiency is improved. And the refrigerant heating module can heat the refrigerant to raise the temperature so as to further improve the defrosting circulation efficiency and greatly shorten the defrosting time.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigeration system and a control method thereof.
Background
The air-cooled refrigerator has an automatic defrosting function, and the defrosting mode commonly adopted is defrosting by an electric heater. The electric heating pipe is arranged below the evaporator, natural convection is formed by heating air, and the evaporator is defrosted by heat radiation of the electric heating pipe, so that the defrosting efficiency is low, the defrosting time is long, and the defrosting power consumption is high. The defrosting process is influenced by natural convection hot air, the temperature of the storage compartment is high, the bacterial reproduction speed is accelerated, and the quality guarantee period of the food materials is shortened.
Compared with the defrosting mode of the electric heater, the efficiency can be improved to a certain extent by a hot gas bypass mode, but limited by the system structure, the defrosting cycle of raising the temperature of the refrigerant only depends on the operation of the compressor, the temperature of the refrigerant is still not high enough, the defrosting time is still longer, and higher temperature rise of the storage compartment is easily caused.
Disclosure of Invention
The invention aims to provide a refrigeration system and a control method thereof to improve defrosting efficiency.
A first aspect of the present invention provides a refrigeration system comprising:
the refrigerant circulating flow path comprises a main flow path and a bypass branch path, the main flow path comprises a compressor, a condenser, a first throttling device and an evaporator which are sequentially arranged, the bypass branch path is configured to be connected with an exhaust port of the compressor and an outlet of the first throttling device, and a control valve for controlling the on-off of the bypass branch path is arranged on the bypass branch path; and
and the refrigerant heating module is arranged on the refrigerant circulating flow path.
In some embodiments, the refrigerant heating module is disposed on the main flow path.
In some embodiments, the refrigerant heating module is located between the evaporator and the compressor; or the refrigerant heating module is positioned between the compressor and the condenser; or the refrigerant heating module is positioned between the condenser and the first throttling device; or the refrigerant heating module is positioned between the first throttling device and the evaporator.
In some embodiments, the refrigerant heating module is disposed on the bypass branch.
In some embodiments, the bypass branch is configured to connect the outlet of the condenser with the outlet of the first flow restriction device.
In some embodiments, the main flow path further comprises a switching valve and a second throttling device connected in parallel with the first throttling device, an inlet of the switching valve is connected with the condenser, a first outlet of the switching valve is connected with the first throttling device, a second outlet of the switching valve is connected with the second throttling device, the switching valve is operated to selectively communicate the inlet of the switching valve with one of the first outlet and the second outlet, and a flow rate of the second throttling device is less than a flow rate of the first throttling device.
In some embodiments, the refrigerant heating module includes a heater disposed outside the refrigerant tube, and the heater includes an electromagnetic induction heater, an infrared heater, or a resistance heater.
A second aspect of the present invention provides a control method for a refrigeration system according to any one of the first aspects of the present invention, including the steps of:
judging whether the refrigerating system meets defrosting conditions or not; and
if the refrigerating system does not meet the defrosting condition, keeping the refrigerating system to enter a refrigerating mode: keeping the control valve closed to disconnect the bypass branch and keep the refrigerant heating module closed;
if the refrigerating system meets the defrosting condition, controlling the refrigerating system to enter a defrosting mode: and controlling the control valve to open so as to communicate the bypass branch and control the refrigerant heating module to open.
In some embodiments, the control method further comprises: and if the refrigerating system meets the defrosting condition, controlling the compressor to operate at the maximum power.
In some embodiments, the control method further includes determining whether the temperature of the refrigerant is within a preset range of the temperature of the refrigerant during the defrosting mode operation and controlling the power of the refrigerant heating module according to the temperature of the refrigerant.
Based on the refrigeration system and the control method thereof provided by the invention, the refrigeration system comprises a refrigerant circulation flow path and a refrigerant heating module arranged on the refrigerant circulation flow path, the refrigerant circulation flow path comprises a main flow path and a bypass branch, and the main flow path comprises a compressor, a condenser, a first throttling device and an evaporator which are sequentially arranged. The bypass branch is connected with the exhaust port of the compressor and the outlet of the first throttling device, and a control valve for controlling the on-off of the bypass branch is arranged on the bypass branch. After the refrigeration system enters the defrosting mode, the control valve is opened to enable the bypass branch to be communicated, the bypass branch does not pass through the first throttling device, the resistance of the bypass branch is smaller than that of the main flow path, a large amount of refrigerant flows to the evaporator through the bypass branch, and compared with the refrigerant flowing to the evaporator through the main flow path, the temperature of the refrigerant is higher, so that the defrosting efficiency is improved. And the refrigerant heating module can heat the refrigerant to raise the temperature so as to further improve the defrosting circulation efficiency and greatly shorten the defrosting time.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
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 limiting the invention. In the drawings:
fig. 1 is a schematic structural view of a refrigeration system according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a refrigeration system according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a refrigeration system according to a third embodiment of the present invention;
FIG. 4 is a schematic diagram of a refrigeration system according to a fourth embodiment of the present invention;
FIG. 5 is a schematic diagram of a refrigeration system according to a fifth embodiment of the present invention;
FIG. 6 is a schematic diagram of a refrigeration system according to a sixth embodiment of the present invention;
fig. 7 is a schematic configuration diagram of a refrigeration system according to a seventh embodiment of the present invention;
fig. 8 is a schematic structural view of a refrigeration system according to an eighth embodiment of the present invention;
fig. 9 is a schematic configuration diagram of a refrigeration system according to a ninth embodiment of the present invention;
fig. 10 is a schematic configuration diagram of a refrigeration system according to a tenth embodiment of the present invention;
fig. 11 to 14 are schematic structural diagrams of four different forms of refrigerant heating modules according to embodiments of the present invention;
fig. 15 is a flowchart of a control method of a refrigeration system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Referring to fig. 1 to 10, a refrigeration system according to an embodiment of the present invention includes:
the refrigerant circulating flow path comprises a main flow path and a bypass branch, wherein the main flow path comprises a compressor 1, a condenser 2, a first throttling device 3 and an evaporator 4 which are sequentially arranged. The bypass branch is connected with the exhaust port of the compressor 1 and the outlet of the first throttling device 3, and a control valve 6 for controlling the on-off of the bypass branch is arranged on the bypass branch; and
and the refrigerant heating module 5 is arranged on the refrigerant circulating path.
After the refrigeration system enters a defrosting mode, the control valve 6 is opened to enable the bypass branch to be communicated, the bypass branch does not pass through the first throttling device 3, the resistance of the bypass branch is smaller than that of the main flow path, a large amount of refrigerant flows to the evaporator 4 through the bypass branch, and compared with the refrigerant flowing to the evaporator 4 through the main flow path, the temperature of the refrigerant is higher, so that the defrosting efficiency is improved. And the refrigerant heating module 5 can heat the refrigerant to raise the temperature so as to further improve the defrosting circulation efficiency and greatly shorten the defrosting time.
The refrigeration system of the embodiment can be used in refrigeration equipment such as a refrigerator, an ice chest, an air conditioner and the like.
As shown in fig. 1, the refrigeration system of the first embodiment includes a refrigerant circulation flow path and a refrigerant heating module 5 disposed on the refrigerant circulation flow path, wherein the refrigerant circulation flow path includes a main flow path and a bypass branch path, and the main flow path includes a compressor 1, a condenser 2, a first throttling device 3, and an evaporator 4, which are sequentially disposed. The bypass branch is connected with the exhaust port of the compressor 1 and the outlet of the first throttling device 3, and a control valve 6 for controlling the on-off of the bypass branch is arranged on the bypass branch.
The bypass branch is disposed between the discharge port of the compressor 1 and the outlet of the first throttle device 3. After the control valve 6 is opened, the refrigerant is connected through the bypass branch to form a bypass defrosting loop, pressure balance is formed in the loop along with the opening of the control valve 6, the bypass branch does not pass through the condenser 2 and the first throttling device 3, the resistance of the bypass branch is smaller than that of a main flow path, and a large amount of refrigerant passes through the loop, namely, the defrosting circulation state of hot gas bypass is started.
In this embodiment, the refrigerant heating module 5 is disposed on the main flow path. And the refrigerant heating module 5 is located on the flow path between the evaporator 4 and the compressor 1. Specifically, the refrigerant heating module 5 may be located between the outlet of the evaporator 4 and the suction port of the compressor 1, and may be located on the suction pipe of the compressor 1. The refrigerant heating module 5 is started, the low-temperature refrigerant subjected to defrosting and heat exchange of the evaporator 4 is heated and warmed, and then returns to the compressor, the refrigerant heating module 5 provides supplementary heat for the refrigerant, so that the defrosting circulation efficiency is improved, and compared with the method that the defrosting is heated and heated only through the compressor, the defrosting time is greatly shortened.
After entering the defrosting mode, the compressor 1 can be operated at the maximum operation power to increase the temperature of the refrigerant without automatic control. Of course, the compressor 1 can also be automatically controlled to operate according to a set program, so that the energy consumption is saved on the basis of increasing the temperature of the refrigerant.
As shown in fig. 2, unlike the refrigeration system of the first embodiment shown in fig. 1, in the second embodiment, a bypass branch connects the outlet of the condenser 2 with the outlet of the first throttling device 3. When the refrigerating system enters a defrosting mode to enable the control valve 6 to be opened, after the refrigerant passes through the condenser 2, as the control valve 6 of the bypass branch is opened at the moment, the resistance of the bypass branch is obviously smaller than that of the main flow path, at the moment, a large amount of high-temperature refrigerant directly enters the evaporator 4 through the bypass branch, and a defrosting circulation state of hot gas bypass is started.
As shown in fig. 3, unlike the refrigeration system of the first embodiment shown in fig. 1, in the third embodiment, the refrigerant heating module 5 is provided in the bypass. The refrigerant heating module 5 heats the refrigerant flowing through the bypass branch to increase the temperature of the refrigerant. After the bypass branch is communicated, the quantity of the refrigerant flowing through the bypass branch is larger, so that the refrigerant heating module 5 is arranged on the bypass branch, and a larger proportion of the refrigerant is heated by the refrigerant heating module 5.
As shown in fig. 4, unlike the refrigeration system of the first embodiment shown in fig. 1, in the fourth embodiment, a refrigerant heating module 5 is provided in the main flow path between the first throttle device 3 and the evaporator 4. Specifically, the refrigerant heating module 5 is located on an inlet pipe of the evaporator 4. The refrigerant heating module 5 heats the refrigerant throttled by the first throttling device 3 to increase the temperature of the refrigerant entering the evaporator 4, thereby improving defrosting efficiency.
As shown in fig. 5, unlike the refrigeration system of the second embodiment shown in fig. 2, in the fifth embodiment, a refrigerant heating module 5 is provided in the main flow path between the compressor 1 and the condenser 2. Specifically, the refrigerant heating module 5 is located on the exhaust pipe of the compressor 1.
As shown in fig. 6, unlike the refrigeration system of the second embodiment shown in fig. 2, in the sixth embodiment, a refrigerant heating module 5 is provided in the main flow path between the condenser 2 and the first throttle device 3. Specifically, the refrigerant heating module 5 is located on the outlet pipe of the condenser 2.
As shown in fig. 7, unlike the refrigeration system of the second embodiment shown in fig. 2, in the seventh embodiment, a refrigerant heating module 5 is provided in the main flow path between the first throttle device 3 and the evaporator 4. Specifically, the refrigerant heating module 5 is located on an inlet pipe of the evaporator 4.
As shown in fig. 8, unlike the refrigeration system of the second embodiment shown in fig. 2, in the eighth embodiment, the refrigerant heating module 5 is provided in the bypass.
As shown in fig. 9 and 10, the main flow path further includes a switching valve 8 and a second throttle device 7 connected in parallel with the first throttle device 3. An inlet of the switching valve 8 is connected to the condenser 2, a first outlet of the switching valve 8 is connected to the first throttle device 3, a second outlet of the switching valve 8 is connected to the second throttle device 7, the switching valve 8 is operated so that the inlet of the switching valve 8 can selectively communicate with one of the first outlet and the second outlet, and a flow rate of the second throttle device 7 is smaller than a flow rate of the first throttle device 3. When the refrigeration system is in a normal refrigeration mode, the switching valve 8 acts to enable the inlet of the switching valve 8 to be communicated with the first outlet, and at the moment, the first throttling device 3 works; when the refrigeration system is in the defrosting mode, the switching valve 8 operates to enable the inlet of the switching valve 8 to be communicated with the second outlet, at the moment, the second throttling device 7 works, and the flow rate of the second throttling device 7 is smaller than that of the first throttling device 3, so that when the temperature of the refrigerant is increased by the compressor 1, a sufficient pressure difference is provided for the system, and the temperature and the pressure of the liquid refrigerant are increased.
The first throttle 3 and the second throttle 7 may be throttle valves, capillary tubes, etc. For a refrigeration system with a low refrigeration capacity, a capillary tube may be used. When the first throttle 3 and the second throttle 7 are capillaries, the capillary tube of the first throttle 3 has a larger length than the capillary tube of the second throttle 7.
In the above embodiments, adjacent two of the compressor 1, the condenser 2, the first throttling device 3, and the evaporator 4 are connected by refrigerant pipes. Similarly, the bypass branch is also formed by a refrigerant pipe. The refrigerant heating module 5 of the present embodiment includes a heater disposed outside the refrigerant pipe. The heater includes an electromagnetic induction heater 51 or an infrared heater 52 or a resistance heater.
As shown in fig. 11, the refrigerant heating module 5 includes an electromagnetic induction heater 51 provided outside the refrigerant pipe 9. The electromagnetic induction heater 51 includes a coil 511 disposed around the refrigerant pipe 9. And the electromagnetic induction heater 51 is mounted on the refrigerant pipe 9 through a fixing member 52.
As shown in fig. 12, the refrigerant heating module 5 includes an infrared heater 53 disposed outside the refrigerant pipe 9. The infrared heater 53 includes an infrared heater tube bundle 531 disposed around the refrigerant tube 9. The infrared heater 53 is attached to the refrigerant pipe 9 by a fixing member 52.
As shown in fig. 13, the refrigerant heating module 5 includes an electric resistance heating tube 54 sleeved outside the refrigerant tube 9. The resistance type electric heating tube 54 is bound and fixed on the refrigerant tube 9 by a binding band 55.
As shown in fig. 14, the refrigerant heating module 5 includes an electric resistance heater 55 wound around the refrigerant pipe 9. For example, the resistive electric heating device 55 may be an electric heating belt, a heating wire, or a spiral heating tube.
The control method of the refrigeration system of the embodiment comprises the following steps:
judging whether the refrigerating system meets defrosting conditions or not; and
if the refrigerating system does not meet the defrosting condition, the refrigerating system is kept to operate in a refrigerating mode: keeping the control valve 6 closed to disconnect the bypass branch and keep the refrigerant heating module 5 closed;
if the refrigerating system meets the defrosting condition, controlling the refrigerating system to enter a defrosting mode: and controlling the control valve 6 to be opened so as to communicate the bypass branch and control the refrigerant heating module 5 to be opened.
After the refrigeration system enters the defrosting mode, the control valve 6 is opened to enable the bypass branch to be communicated, the bypass branch does not pass through the first throttling device 3, the resistance of the bypass branch is smaller than that of the main flow path, a large amount of refrigerant flows to the evaporator 4 through the bypass branch, and compared with the refrigerant flowing to the evaporator 4 through the main flow path, the temperature of the refrigerant is higher. And the refrigerant heating module 5 can heat the refrigerant to raise the temperature so as to improve the defrosting circulation efficiency and greatly shorten the defrosting time.
The control valve 6 of this embodiment is an electromagnetic valve, and the control module can control the opening and closing of the electromagnetic valve according to the judgment result of whether the refrigeration system meets the defrosting condition.
The defrosting condition refers to a criterion for meeting the operation start of the defrosting mode, and the defrosting condition may be the operation time of the refrigeration system, or may be combined with the defrosting temperature detected by the defrosting temperature sensor. For example, setting a defrosting interval of 12h, defrosting is performed every 12 h; the defrosting mode can also be entered by combining the detection temperature of the defrosting temperature sensor, for example, setting the detection temperature of the defrosting temperature sensor to be lower than the set temperature for 12h continuously. The defrosting condition needs to be set according to different machine types and different compartments (for refrigerators) requirements to control temperature rise of the system to be set differently.
In some embodiments, the control method further comprises: and if the refrigerating system meets the defrosting condition, controlling the compressor 1 to operate at the maximum power.
Specifically, as shown in fig. 15, after the defrosting condition is determined to be satisfied, if the condenser 2 at this stage has a device (such as a condenser fan) for forced convection cooling during operation, the device is stopped, at this time, the compressor 1 is operated at the maximum power for a period of time, and other components of the refrigeration system continue to operate in the state of the refrigeration mode, so that the exhaust temperature of the compressor reaches the maximum value at the current stage or reaches the preset operation time (the exhaust temperature limit value and the operation time at this stage can be preset).
Further, in this operation, as shown in fig. 9, a second throttling device 7 and a switching valve 8 may be added to the system to increase the system pressure difference, so that the liquid refrigerant in the condenser 2 is properly increased in pressure, and the time control is performed to ensure that the temperature of the evaporator is not decreased enough to cause more frosting in a short time. At this time, a defrosting mode is entered, and forced convection devices (freezing fans, refrigerating fans and the like) of all the heat exchangers are closed.
In some embodiments, the control method further includes determining whether the temperature of the refrigerant is within a preset range of the temperature of the refrigerant during the defrosting mode operation and controlling the power of the refrigerant heating module according to the temperature of the refrigerant. Specifically, a refrigerant temperature sensor is provided in the refrigerant circulation flow path to detect the refrigerant temperature. The refrigerant temperature detected by the refrigerant temperature sensor is within the range of the preset refrigerant temperature value. The refrigerant temperature sensors can be arranged at different positions of the refrigerant circulation flow path, and the preset refrigerant temperature value ranges are different for the refrigerant temperature sensors arranged at different positions.
In the control module, the preset temperature range of the refrigerant in the defrosting mode and the preset operation power of the refrigerant heating module 5 are preset. The lower limit value of the refrigerant temperature preset value range is required to be more than or equal to the lower limit value of the defrosting refrigerant temperature judged according to the defrosting condition, and the upper limit value of the refrigerant temperature preset value is required to be less than the upper limit value of the defrosting refrigerant temperature judged according to the defrosting condition and less than the highest suction temperature of the compressor. The defrosting refrigerant temperature and the preset value of the refrigerant temperature which are judged by the defrosting condition are set by referring to the temperature of a defrosting sensor and a plurality of conditions (such as running time, door opening time, defrosting time which is set and the like which can be changed along with the use condition or parameters which can be adjusted manually) arranged in the system, and the arrangement position of a refrigerant heating module is referred at the same time, and the judgment condition is given by a control module, wherein the higher the preset value is, the better the preset value is theoretically, but the optimal value processing is adopted for saving energy consumption and considering the running service life and the safety of a compressor and other system components. When the numerical value fed back by the refrigerant temperature sensor in the defrosting mode is lower than the preset lower limit value, the power of the refrigerant heating module is increased until the refrigerant temperature is higher than the preset lower limit value, and the increased power can be controlled to the maximum value of the operating power of the refrigerant heating module (the operation can be controlled in a mode of not limiting the use of adjusting voltage) so as to accelerate the increase of the refrigerant temperature; when the numerical value fed back by the refrigerant temperature sensor in the defrosting mode is higher than the upper limit of the preset temperature, the power of the refrigerant heating module is reduced until the temperature of the refrigerant is lower than the upper limit of the preset value (the control can be carried out in a mode of not limiting to using the regulated voltage), and the power can be reduced until the refrigerant heating module is completely closed so as to control the temperature reduction of the refrigerant. Thus, the aim of automatically controlling the temperature of the refrigerant in the defrosting process is fulfilled.
When the condition that the defrosting mode is finished is judged to be met, the operation of the refrigerant heating module 5 is closed, the operation of the compressor 1 is closed, meanwhile, the control valve 6 of the bypass branch is closed, the system is restored to the state that only the main branch can work, and the defrosting mode is finished.
The condition for the defrosting mode to end may be a defrosting mode operation time (e.g., a defrosting time exceeds a preset time) or a detected temperature of the defrosting temperature sensor reaches a preset value (e.g., greater than 0 ℃ for a certain time or greater than 0 ℃).
After the defrosting mode is finished, the compressor returns to the running state of the refrigerating mode, parts required by running of the refrigerating system in the current mode are restarted, the refrigerating equipment enters the refrigerating state again until the defrosting condition is met next time, and the actions are repeated.
Finally, it should be noted that: the above examples are only intended 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 preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. A refrigeration system, comprising:
the refrigerant circulating flow path comprises a main flow path and a bypass branch path, wherein the main flow path comprises a compressor (1), a condenser (2), a first throttling device (3) and an evaporator (4) which are sequentially arranged, the bypass branch path is configured to be connected with an exhaust port of the compressor (1) and an outlet of the first throttling device (3), and a control valve (6) for controlling the on-off of the bypass branch path is arranged on the bypass branch path; and
and the refrigerant heating module (5) is arranged on the refrigerant circulating flow path.
2. A refrigeration system according to claim 1, characterized in that the refrigerant heating module (5) is arranged on the main flow path.
3. A refrigeration system according to claim 2, characterized in that the refrigerant heating module (5) is located between the evaporator (4) and the compressor (1); or the refrigerant heating module (5) is positioned between the compressor (1) and the condenser (2); or the refrigerant heating module (5) is positioned between the condenser (2) and the first throttling device (3); or the refrigerant heating module (5) is positioned between the first throttling device (3) and the evaporator (4).
4. The refrigeration system as claimed in claim 1, wherein the refrigerant heating module (5) is disposed on the bypass branch.
5. A refrigeration system according to any of claims 1 to 4, characterized in that the bypass branch is configured to connect the outlet of the condenser (2) with the outlet of the first throttle device (3).
6. A refrigeration system according to any of claims 1 to 4, characterized in that the main flow path further comprises a switching valve (8) and a second throttle device (7) connected in parallel with the first throttle device (3), the inlet of the switching valve (8) being connected with the condenser (2), the first outlet of the switching valve (8) being connected with the first throttle device (3), the second outlet of the switching valve (8) being connected with the second throttle device (7), the switching valve (8) being actuated to selectively place the inlet of the switching valve (8) in communication with one of the first outlet and the second outlet, the flow rate of the second throttle device (7) being smaller than the flow rate of the first throttle device (3).
7. The refrigeration system as claimed in claim 1, wherein the refrigerant heating module (5) comprises a heater disposed outside the refrigerant pipe, and the heater comprises an electromagnetic induction heater, an infrared heater or a resistance heater.
8. A control method of a refrigeration system based on any one of claims 1 to 7, characterized by comprising the steps of:
judging whether the refrigerating system meets defrosting conditions or not; and
if the refrigerating system does not meet the defrosting condition, keeping the refrigerating system to enter a refrigerating mode: keeping the control valve (6) closed to disconnect the bypass branch and keep the refrigerant heating module (5) closed;
if the refrigerating system meets the defrosting condition, controlling the refrigerating system to enter a defrosting mode: and controlling the control valve (6) to be opened so as to communicate the bypass branch and control the refrigerant heating module (5) to be opened.
9. The control method of the refrigeration system as set forth in claim 8, further comprising: and if the refrigerating system meets the defrosting condition, controlling the compressor (1) to operate at the maximum power.
10. The method as claimed in claim 8, further comprising determining whether the refrigerant temperature is within a preset range of refrigerant temperature during the defrosting mode operation and controlling the power of the refrigerant heating module according to the refrigerant temperature.
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