CN214582000U - Freezing and refrigerating device - Google Patents
Freezing and refrigerating device Download PDFInfo
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- CN214582000U CN214582000U CN202120282777.7U CN202120282777U CN214582000U CN 214582000 U CN214582000 U CN 214582000U CN 202120282777 U CN202120282777 U CN 202120282777U CN 214582000 U CN214582000 U CN 214582000U
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- 238000007710 freezing Methods 0.000 title abstract description 48
- 230000008014 freezing Effects 0.000 title abstract description 48
- 238000005057 refrigeration Methods 0.000 claims abstract description 53
- 238000010257 thawing Methods 0.000 claims abstract description 47
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000003507 refrigerant Substances 0.000 abstract description 69
- 238000000034 method Methods 0.000 description 16
- 238000001816 cooling Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000002026 carminative effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Defrosting Systems (AREA)
- Freezers Or Refrigerated Showcases (AREA)
Abstract
The utility model discloses a freezing and refrigerating device, include: the refrigeration display cabinet comprises an outdoor unit, an air conditioner indoor unit, a refrigeration display cabinet and a freezing display cabinet, wherein the outdoor unit is provided with a bypass pipeline; the first end of the bypass pipeline is connected to an exhaust port of the first compressor through a four-way valve, the first end of the bypass pipeline is also connected to an outdoor heat exchanger, and the second end of the bypass pipeline is connected to a heat exchanger of the refrigerated display cabinet; the air outlet of the first compressor is communicated with the heat exchanger of the refrigeration display cabinet through a bypass pipeline in the defrosting mode, and the air outlet of the first compressor is communicated with the outdoor heat exchanger in the heating mode. The utility model discloses a set up bypass line at the off-premises station, utilize bypass line to make the discharged high temperature high pressure gaseous state refrigerant of first compressor can directly enter into the refrigeration show case under the defrosting mode, realized the quick defrosting of refrigeration show case heat exchanger to can not influence the operation of heating of air conditioner internal unit during the defrosting, make the air conditioner internal unit can heat in succession.
Description
Technical Field
The utility model relates to a freezing cold-stored technical field particularly, relates to a freezing cold storage plant.
Background
There is a conventional refrigerating and freezing apparatus in which an air conditioner indoor unit, a showcase, and a freezing showcase are connected in parallel to an outdoor unit. The refrigerating apparatus can switch a cooling mode, a heating mode and a heat recovery mode by controlling the four-way valve. However, since the refrigerated showcase is required to maintain a temperature of-18 ℃ or lower for a long period of time, the evaporation temperature of the refrigerated showcase is extremely low, and the heat exchanger (as an evaporator) thereof is liable to frost, causing a low heat exchange efficiency.
Aiming at the problem that the heat exchanger of the refrigeration display cabinet in the prior art is frosted, an effective solution is not provided at present.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a freezing and refrigerating device to at least, solve the problem that prior art well freezing show case heat exchanger frosted.
In order to solve the above technical problem, an embodiment of the utility model provides a freezing and refrigerating device, include: the outdoor unit is provided with a bypass pipeline, the first end of the bypass pipeline is connected to an exhaust port of the first compressor through a four-way valve, the first end of the bypass pipeline is further connected to an outdoor heat exchanger, and the second end of the bypass pipeline is connected to the heat exchanger of the freezing showcase; and in the defrosting mode, the air outlet of the first compressor is communicated with the heat exchanger of the refrigeration display cabinet through the bypass pipeline, and in the heating mode, the air outlet of the first compressor is communicated with the outdoor heat exchanger.
Optionally, a reversing device is disposed at a first end of the bypass pipeline, a first port of the reversing device is connected to the four-way valve, a second port of the reversing device is connected to the outdoor heat exchanger, and a third port of the reversing device is connected to the first end of the bypass pipeline.
Optionally, a first valve is arranged on a connecting pipeline between the first end of the bypass pipeline and the outdoor heat exchanger, and a second valve is arranged on the bypass pipeline.
Optionally, a third valve is further disposed on the bypass line, and the third valve is connected between the reversing device and the second end of the bypass line, or the third valve is connected between the second valve and the second end of the bypass line.
Optionally, the refrigerated display case comprises: a second compressor having a discharge port connected to a suction port of the first compressor, the suction port of the second compressor being connected to a heat exchanger of the refrigerated display case.
Optionally, the refrigerated display case comprises: the refrigerating showcase throttling device is connected to one end, which is not connected with the bypass pipeline, of the heat exchanger of the refrigerating showcase.
Use the technical scheme of the utility model, through set up bypass pipeline at the off-premises station, under the defrosting mode, utilize bypass pipeline to make the carminative high temperature high pressure gaseous state refrigerant of first compressor can directly enter into the refrigerated display case to the quick defrosting of refrigerated display case heat exchanger has been realized. And the refrigeration showcase is defrosted, the heating operation of an air conditioner indoor unit is not influenced, and the air conditioner indoor unit can continuously heat.
Drawings
Fig. 1 is a schematic structural diagram of a freezing and refrigerating apparatus and a schematic flow direction of a refrigerant in the heating mode of the structure according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating a flow direction of a refrigerant in a defrosting mode of the freezing and refrigerating apparatus shown in fig. 1 according to an embodiment of the present invention;
fig. 3 is another schematic structural diagram of a freezing and refrigerating apparatus and a refrigerant flow direction schematic diagram of the structure in the heating mode according to an embodiment of the present invention;
fig. 4 is a schematic view illustrating a flow direction of a refrigerant in the defrosting mode of the freezing and refrigerating apparatus shown in fig. 3 according to the embodiment of the present invention;
fig. 5 is a flowchart of a control method of a freezing and refrigerating apparatus according to an embodiment of the present invention;
fig. 6 is a flowchart of defrost control corresponding to fig. 2 provided by an embodiment of the present invention;
fig. 7 is a flowchart of defrost control corresponding to fig. 4 provided by an embodiment of the present invention;
description of reference numerals:
an outdoor unit 1, an air conditioner indoor unit 2, a refrigerated showcase 3, and a refrigerated showcase 4;
a first compressor 111, a third compressor 112, a first four-way valve 121, a second four-way valve 122, a third four-way valve 123, an outdoor heat exchanger 13, an outdoor fan 14, a first flow divider 15, a reversing device 16, a third valve 17, a first cut-off valve 181, a second cut-off valve 182, a third cut-off valve 183, a first valve 191, and a second valve 192;
the air conditioner indoor unit comprises an air conditioner indoor unit heat exchanger 21, an air conditioner indoor unit fan 22, a second flow divider 23 and an air conditioner indoor unit throttling device 24;
a refrigerated showcase heat exchanger 31, a refrigerated showcase fan 32, a third diverter 33, and a refrigerated showcase throttling device 34;
a refrigerated showcase heat exchanger 41, a refrigerated showcase fan 42, a fourth diverter 43, a refrigerated showcase throttling device 44, and a second compressor 45.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that the terms "first", "second", and the like in the description and in the claims and in the drawings of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
An embodiment of the utility model provides a freezing and cold storage device, this freezing and cold storage device can carry out the cooling of freezer, the cooling of freezer and indoor temperature control simultaneously. As shown in fig. 1 to 4, the freezing and refrigerating apparatus includes: outdoor unit 1, air conditioner indoor unit 2, refrigerated showcase 3, and refrigerated showcase 4.
The outdoor unit 1 mainly includes: a first compressor 111, a third compressor 112, an outdoor heat exchanger 13, and an outdoor fan 14. The number of the first compressors 111 is at least one, and the suction ports of two or more first compressors may be selectively communicated by a four-way valve, and the discharge ports of two or more first compressors may be selectively communicated by a four-way valve. The third compressor 112 is used in a cooling mode, and the present application mainly relates to a heating mode and a defrosting mode, and does not relate to the cooling mode, so the operation of the related devices and the flow direction of the refrigerant in the cooling mode are not described in detail.
In the refrigeration mode, the air conditioner indoor unit supplies cold to the indoor space, and the refrigerated showcase and the freezing showcase cool the respective storehouses; in the heating mode, an air conditioner indoor unit heats the indoor space, and the refrigerated showcase and the freezing showcase cool the respective storehouses; in the defrosting mode, the air conditioner indoor unit heats the interior of the room, the refrigerated showcase cools the refrigerator, and the refrigerated showcase defrosts.
The outdoor unit 1 is provided with a bypass line, a first end of which is connected to the discharge port of the first compressor 111 through four-way valves (specifically, a first four-way valve 121 and a second four-way valve 122), a first end of which is also connected to the outdoor heat exchanger 13, and a second end of which is connected to the heat exchanger 41 of the refrigerated showcase.
In the defrosting mode, the air outlet of the first compressor is communicated with the heat exchanger of the refrigeration showcase through a bypass pipeline, so that the refrigerant flows from the compressor to the refrigeration showcase, and the refrigeration showcase is defrosted by the high-temperature refrigerant. The air outlet of the first compressor is communicated with the outdoor heat exchanger in the heating mode, so that when an air conditioner indoor unit supplies heat, the cooling requirements of the refrigeration display cabinet and the freezing display cabinet can be met through the work of the outdoor heat exchanger.
In the refrigeration and cold storage device of the embodiment, the bypass pipeline is arranged on the outdoor unit, and in the defrosting mode, the high-temperature and high-pressure gaseous refrigerant discharged by the first compressor can directly enter the refrigeration showcase by using the bypass pipeline, so that the rapid defrosting of the heat exchanger of the refrigeration showcase is realized. And the refrigeration showcase is defrosted, the heating operation of an air conditioner indoor unit is not influenced, and the air conditioner indoor unit can continuously heat.
Referring to fig. 1 and 2, a reversing device 16 is disposed on the bypass line, and in particular, a reversing device 16 is disposed at a first end of the bypass line. The reversing device can be a four-way valve. A first port of the reversing device 16 is connected to a four-way valve (specifically, a first four-way valve 121), a second port of the reversing device 16 is connected to the outdoor heat exchanger 13, and a third port of the reversing device is connected to a first end of the bypass line. In the defrosting mode, the reversing device 16 is controlled to communicate the exhaust port of the first compressor 111 with the heat exchanger 41 of the refrigeration showcase through the bypass line, so that the flow direction of the refrigerant is changed, and the high-temperature and high-pressure refrigerant discharged by the first compressor 111 can enter the heat exchanger 41 of the refrigeration showcase, thereby defrosting.
In fig. 1 and 2, a third valve 17 may also be provided on the bypass line, the third valve 17 being connected between the reversing device 16 and the second end of the bypass line. In the defrosting mode, the third valve 17 is opened to ensure that the refrigerant can flow into the refrigeration display cabinet from the first compressor; in other operation modes except the defrosting mode, the third valve 17 is closed, so that the refrigerant can flow correctly. The third valve 17 may be a valve element having an opening and closing function, such as a shutoff valve or a solenoid valve.
Referring to fig. 3 and 4, a first valve 191 is provided on a connection line between the first end of the bypass line and the outdoor heat exchanger 13, and a second valve 192 is provided on the bypass line. The first valve and the second valve may be valve elements having an opening and closing function, such as a shut-off valve and a solenoid valve. In the defrosting mode, the first valve 191 and the second valve 192 communicate the exhaust port of the first compressor 111 with the heat exchanger 41 of the refrigeration showcase through the bypass line, and the flow direction of the refrigerant is changed, so that the high-temperature and high-pressure refrigerant discharged from the first compressor 111 can enter the heat exchanger 41 of the refrigeration showcase, thereby defrosting.
In fig. 3 and 4, a third valve 17 may also be provided on the bypass line, the third valve 17 being connected between the second valve 192 and the second end of the bypass line. In the defrosting mode, the third valve 17 is opened to ensure that the refrigerant can flow into the refrigeration display cabinet from the first compressor; in other operation modes except the defrosting mode, the third valve 17 is closed, so that the refrigerant can flow correctly. The third valve 17 may be a valve element having an opening and closing function, such as a shutoff valve or a solenoid valve.
Refrigerated display case 4 can include: and a second compressor 45, wherein an exhaust port of the second compressor 45 is connected to an air inlet of the first compressor 111, and an air inlet of the second compressor 45 is connected to the heat exchanger 41 of the freezing showcase. Since the evaporation temperature required by the refrigerated display case 4 is low and the corresponding evaporation pressure is low, the second compressor 45 mainly performs a supercharging function, and when the refrigerated display case is used to cool a freezer normally, the outlet pressure of the heat exchanger 41 of the refrigerated display case is increased to be equivalent to the outlet pressure of the heat exchanger 31 of the refrigerated display case, and the refrigerant is merged into the first compressor 111.
It should be noted that the throttling devices 24, 34 and 44 in the present embodiment may be electronic expansion valves, thermal expansion valves, throttle valves, capillary tubes, etc.
The embodiment of the utility model provides a still provide a control method of freezing cold storage plant, can be applied to the utility model discloses a freezing cold storage plant, as shown in fig. 5, this method includes following step:
s501, receiving a defrosting instruction.
And S502, controlling a bypass pipeline to communicate an exhaust port of the first compressor with a heat exchanger of the refrigerated display cabinet.
S503, controlling the fan of the refrigeration showcase to stop working, and adjusting the throttling device of the refrigeration showcase to the maximum opening degree.
According to the control method of the embodiment, in the defrosting mode, the high-temperature and high-pressure gaseous refrigerant discharged by the first compressor can directly enter the refrigeration showcase by utilizing the bypass pipeline, and meanwhile, the defrosting action is completed by controlling the fan and the throttling device in the refrigeration showcase in a matching manner, so that the quick defrosting of the heat exchanger of the refrigeration showcase is realized. And the refrigeration showcase is defrosted, the heating operation of an air conditioner indoor unit is not influenced, and the air conditioner indoor unit can continuously heat.
If be provided with switching-over device and third valve on the bypass pipeline, control bypass pipeline intercommunication first compressor's gas vent and the heat exchanger of freezing show case, include: adjusting the frequency of the first compressor to a preset reversing frequency; the control reversing device is communicated with the first port and the third port, and a third valve is opened so that the refrigerant flows from the first compressor to the refrigeration showcase; the first port of the reversing device is connected to the four-way valve, the third port of the reversing device is connected to the first end of the bypass pipeline, and the third valve is connected between the reversing device and the second end of the bypass pipeline. The preset reversing frequency is specific to the reversing device, the reversing device has a specific frequency during reversing, and reversing is performed at the specific frequency, so that the noise is good and the reversing success rate is high. In the present embodiment, based on the structure shown in fig. 1 and 2, the direction of the refrigerant flow is changed by controlling the reversing device and the third valve, so that the defrosting mode and the heating mode are switched.
If be provided with first valve, second valve and third valve on the bypass pipeline, control bypass pipeline intercommunication first compressor's gas vent and the heat exchanger of freezing show case, include: closing the first valve, and opening the second valve and the third valve to enable the refrigerant to flow from the first compressor to the refrigeration showcase; the first valve is arranged on a connecting pipeline between the first end of the bypass pipeline and the outdoor heat exchanger, and the third valve is connected between the second valve and the second end of the bypass pipeline. In the present embodiment, based on the structures shown in fig. 3 and 4, the first valve, the second valve, and the third valve are controlled to change the flow direction of the refrigerant, so that the defrosting mode and the heating mode are switched.
Considering that when the heating mode is changed into the defrosting mode, the outdoor heat exchanger is still in a high-temperature and high-pressure state, the refrigeration showcase is in an ultra-low-pressure state, and the refrigerant flows from a high-pressure side to a low-pressure side, so that the refrigerant at the outlet of the outdoor heat exchanger enters the heat exchanger of the refrigeration showcase, and at the moment, the refrigerant at both ends of the refrigeration showcase enters the high-pressure refrigerant, circulation is easy to be unsmooth, the heat exchange amount is reduced, and the defrosting progress is hindered, therefore, in one embodiment, after the bypass pipeline is controlled to communicate the exhaust port of the first compressor and the heat exchanger of the refrigeration showcase, the method further comprises the following steps: controlling an outdoor fan to keep a starting state and monitoring the outlet temperature of an outdoor heat exchanger; and when the outlet temperature of the outdoor heat exchanger is kept unchanged for the preset time, the outlet temperature of the outdoor heat exchanger is stable, and the outdoor fan is controlled to stop working. The embodiment keeps the outdoor fan on when the defrosting mode is just started, so that the heat energy of the outdoor heat exchanger can be quickly discharged to the outside, and the defrosting speed of the heat exchanger of the refrigeration showcase is increased.
In one embodiment, after controlling the bypass line to communicate the discharge port of the first compressor with the heat exchanger of the refrigerated display case, the method further comprises: and adjusting the frequency of the first compressor according to the discharge pressure of the first compressor so that the discharge pressure of the first compressor is not more than the preset pressure. When the heating mode is changed into the defrosting mode, the pressure of the condensing side generally rises, and at the moment, the operation frequency of the first compressor is adjusted according to the exhaust pressure, so that the reliability problem (such as overhigh pressure) can be avoided, and the reliable operation of the freezing and refrigerating device is ensured.
If the second compressor is arranged in the refrigeration showcase, after the control bypass pipeline communicates the exhaust port of the first compressor with the heat exchanger of the refrigeration showcase, the refrigeration showcase further comprises: and controlling the second compressor to stop working. The second compressor is used for boosting when the refrigeration showcase is cooled, and the second compressor is not needed to work in a defrosting mode.
The control operation of the outdoor fan, the adjustment operation of the frequency of the first compressor, and the control operation of the devices in the refrigerated display case (the second compressor, the refrigerated display case fan, and the refrigerated display case throttling device) can be performed simultaneously.
The following describes the above-mentioned freezing and refrigerating apparatus and the control method thereof in detail with reference to fig. 1 to 4, however, it should be noted that this embodiment is only for better describing the present application and should not be construed as a limitation to the present application. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted.
As shown in fig. 1, in the heating mode, the refrigerant discharged from the first compressor 111 is branched. A part of refrigerant enters the air conditioner indoor unit 2 through the first four-way valve 121 (the first four-way valve 121 is in a power-down state, that is, a port connected with the heat exchanger 21 of the air conditioner indoor unit is communicated with a port connected with the exhaust port of the first compressor 111, and a port connected with the second four-way valve 122 is communicated with a port connected with the reversing device 16), and in the air conditioner indoor unit 2, the refrigerant sequentially passes through the heat exchanger 21 of the air conditioner indoor unit (serving as a condenser), the second flow divider 23 and the throttling device 24 of the air conditioner indoor unit, at this time, the fan 22 of the air conditioner indoor unit is turned on, and the throttling device 24 of the air conditioner indoor unit is turned on. The other part of the refrigerant enters the outdoor heat exchanger 13 (acting as a condenser) through the reversing device 16 (the reversing device 16 is in a power-on state, i.e., the first four-way valve 121 is communicated with the outdoor heat exchanger 13, and the first four-way valve 121 is not communicated with the bypass pipeline), and passes through the first flow divider 15. Then, the two refrigerants are merged and split again. A portion of the refrigerant enters the refrigerated display case 3, and in the refrigerated display case 3, the refrigerant passes through a refrigerated display case throttling device 34, a third flow divider 33, and a refrigerated display case heat exchanger 31 (acting as an evaporator) in this order, at which time a refrigerated display case fan 32 is activated and the refrigerated display case throttling device 34 is opened. The other part of the refrigerant enters the freezing showcase 4, and in the freezing showcase 4, the refrigerant passes through the freezing showcase throttling device 44, the fourth flow divider 43, the freezing showcase heat exchanger 41 (as an evaporator) and the second compressor 45 in sequence, at this time, the freezing showcase fan 42 is started, the freezing showcase throttling device 44 is opened, and the second compressor 45 is operated. Thereafter, the two refrigerants are merged again and returned to the first compressor 111. In the entire process, third compressor 112 is not operating, third four-way valve 123 is powered on (i.e., the suction ports of the two first compressors are in communication), and third valve 17 is closed.
As shown in fig. 2, corresponding to the configuration shown in fig. 1, in the defrosting mode, the refrigerant discharged from the first compressor 111 is branched. A part of refrigerant enters the air conditioner indoor unit 2 through the first four-way valve 121 (the first four-way valve 121 is in a power-down state, that is, a port connected with the heat exchanger 21 of the air conditioner indoor unit is communicated with a port connected with the exhaust port of the first compressor 111, and a port connected with the second four-way valve 122 is communicated with a port connected with the reversing device 16), and in the air conditioner indoor unit 2, the refrigerant sequentially passes through the heat exchanger 21 of the air conditioner indoor unit (serving as a condenser), the second flow divider 23 and the throttling device 24 of the air conditioner indoor unit, at this time, the fan 22 of the air conditioner indoor unit is turned on, and the throttling device 24 of the air conditioner indoor unit is turned on. The other part of the refrigerant enters the refrigeration showcase 4 through the reversing device 16 (the reversing device is in a power-off state, namely, the first four-way valve 121 is communicated with the bypass pipeline, and the first four-way valve 121 is not communicated with the outdoor heat exchanger 13), in the refrigeration showcase 4, the refrigerant passes through the refrigeration showcase heat exchanger 41 (serving as a condenser), the fourth flow divider 43 and the refrigeration showcase throttling device 44 in sequence, at this time, the refrigeration showcase fan 42 stops running, the refrigeration showcase throttling device 44 is opened to the maximum opening degree, and the second compressor 45 does not work. Then, the two refrigerants are merged. After being merged, the refrigerant enters the showcase 3, and in the showcase 3, the refrigerant passes through the showcase throttling device 34, the third flow divider 33, and the showcase heat exchanger 31 (serving as an evaporator) in this order, and at this time, the showcase fan 32 is started, and the showcase throttling device 34 is opened. Then, the refrigerant returns to the first compressor 111. In the whole process, the third compressor 112 does not operate, the third four-way valve 123 is powered on (i.e., the suction ports of the two first compressors are communicated), the third valve 17 is opened, the third stop valve 183 is closed, and the outdoor fan 14 stops operating after meeting the conditions (i.e., when the outlet temperature of the outdoor heat exchanger 13 is not changed for a period of time).
As shown in fig. 3, in the heating mode, the refrigerant discharged from the first compressor 111 is branched. A part of refrigerant enters the air conditioner indoor unit 2 through the first four-way valve 121 (the first four-way valve 121 is in a power-down state, that is, the port connected with the heat exchanger 21 of the air conditioner indoor unit is communicated with the port connected with the exhaust port of the first compressor 111, and the port connected with the second four-way valve 122 is communicated with the port connected with the first valve 191), and in the air conditioner indoor unit 2, the refrigerant sequentially passes through the heat exchanger 21 of the air conditioner indoor unit (serving as a condenser), the second flow divider 23 and the throttling device 24 of the air conditioner indoor unit, at this time, the fan 22 of the air conditioner indoor unit is opened, and the throttling device 24 of the air conditioner indoor unit is opened. Another portion of the refrigerant enters the outdoor heat exchanger 13 (acting as a condenser) through a first valve 191 and passes through a first flow divider 15. Then, the two refrigerants are merged and split again. A portion of the refrigerant enters the refrigerated display case 3, and in the refrigerated display case 3, the refrigerant passes through a refrigerated display case throttling device 34, a third flow divider 33, and a refrigerated display case heat exchanger 31 (acting as an evaporator) in this order, at which time a refrigerated display case fan 32 is activated and the refrigerated display case throttling device 34 is opened. The other part of the refrigerant enters the freezing showcase 4, and in the freezing showcase 4, the refrigerant passes through the freezing showcase throttling device 44, the fourth flow divider 43, the freezing showcase heat exchanger 41 (as an evaporator) and the second compressor 45 in sequence, at this time, the freezing showcase fan 42 is started, the freezing showcase throttling device 44 is opened, and the second compressor 45 is operated. Thereafter, the two refrigerants are merged again and returned to the first compressor 111. In the whole process, the third compressor 112 is not operated, the third four-way valve 123 is powered on (i.e., the suction ports of the two first compressors are communicated), the first valve 191 is opened, the second valve 192 is closed, and the third valve 17 is closed.
As shown in fig. 4, corresponding to the configuration shown in fig. 3, in the defrosting mode, the refrigerant discharged from the first compressor 111 is branched. A part of refrigerant enters the air conditioner indoor unit 2 through the first four-way valve 121 (the first four-way valve 121 is in a power-down state, that is, the port connected with the heat exchanger 21 of the air conditioner indoor unit is communicated with the port connected with the exhaust port of the first compressor 111, and the port connected with the second four-way valve 122 is communicated with the port connected with the second valve 192), and in the air conditioner indoor unit 2, the refrigerant sequentially passes through the heat exchanger 21 of the air conditioner indoor unit (serving as a condenser), the second flow divider 23 and the throttling device 24 of the air conditioner indoor unit, at this time, the fan 22 of the air conditioner indoor unit is opened, and the throttling device 24 of the air conditioner indoor unit is opened. Another part of the refrigerant enters the refrigerated display case 4 through the second valve 192, and in the refrigerated display case 4, the refrigerant passes through the refrigerated display case heat exchanger 41 (serving as a condenser), the fourth flow divider 43 and the refrigerated display case throttling device 44 in sequence, at this time, the refrigerated display case fan 42 stops operating, the refrigerated display case throttling device 44 is opened to the maximum opening degree, and the second compressor 45 does not work. Then, the two refrigerants are merged. After being merged, the refrigerant enters the showcase 3, and in the showcase 3, the refrigerant passes through the showcase throttling device 34, the third flow divider 33, and the showcase heat exchanger 31 (serving as an evaporator) in this order, and at this time, the showcase fan 32 is started, and the showcase throttling device 34 is opened. Then, the refrigerant returns to the first compressor 111. In the whole process, the third compressor 112 does not work, the third four-way valve 123 is powered on (i.e. the suction ports of the two first compressors are communicated), the first valve 191 is closed, the second valve 192 is opened, the third valve 17 is opened, and the outdoor fan 14 stops running after meeting the conditions (i.e. when the outlet temperature of the outdoor heat exchanger 13 is not changed for a period of time).
As shown in fig. 6, the defrosting control flow corresponding to fig. 2 includes the following steps:
and S601, when the defrosting flag bit of the system is effective, the system enters a defrosting mode.
S602, the first compressor 111 is adjusted to a preset commutation frequency Fset of the commutation device 16.
S603, the reversing device 16 is adjusted from the power-on state to the power-off state, and the flowing direction of the refrigerant is changed. Specifically, the first four-way valve 121 is communicated with the bypass line, and the first four-way valve 121 is not communicated with the outdoor heat exchanger 13. Then, the control of S604-S606 is performed simultaneously.
And S604, controlling the outdoor fan 14 to stop working when the outlet temperature T1 of the outdoor heat exchanger 13 is unchanged for x seconds.
S605, adjusting the operation frequency of the first compressor 111 according to the exhaust pressure P1(P1 is less than or equal to Pset).
S606, the second compressor 45 and the freezing showcase fan 42 stop operating, and the freezing showcase throttling device 44 is adjusted to the maximum opening degree. Other controllable components are controlled according to the original control logic.
As shown in fig. 7, the defrosting control flow corresponding to fig. 4 includes the following steps:
and S701, when the defrosting flag bit of the system is effective, the system enters a defrosting mode.
S702, the second valve 192 is opened.
S703, the first valve 191 is closed, and the flow direction of the refrigerant is changed. Then, the control of S704-S706 is performed simultaneously.
And S704, when the outlet temperature T1 of the outdoor heat exchanger 13 is unchanged for x seconds, controlling the outdoor fan 14 to stop working.
S705, according to the exhaust pressure P1(P1 is less than or equal to Pset), the operation frequency of the first compressor 111 is adjusted.
S706, the second compressor 45 and the freezer showcase fan 42 stop operating, and the freezer showcase throttling device 44 is adjusted to the maximum opening degree. Other controllable components are controlled according to the original control logic.
According to the refrigeration and cold storage device and the control method thereof, the bypass pipeline is arranged, so that high-temperature and high-pressure gas exhausted by the first compressor can directly enter the refrigeration showcase, the refrigeration showcase is quickly defrosted, the defrosting does not influence the heating of the air conditioner indoor unit, and the air conditioner indoor unit can continuously heat. The flow direction of the refrigerant is controlled by the two schemes through the arrangement of the reversing device and the third valve or the arrangement of the first valve, the second valve and the third valve, so that the switching between the defrosting mode and the heating mode is realized. The defrosting action of the refrigeration showcase is completed by controlling the cooperation of the second compressor, the refrigeration showcase fan, the outdoor fan and the refrigeration showcase throttling device.
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: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (6)
1. A cold storage unit comprising: the outdoor unit is provided with a bypass pipeline;
the first end of the bypass pipeline is connected to an air outlet of the first compressor through a four-way valve, the first end of the bypass pipeline is also connected to an outdoor heat exchanger, and the second end of the bypass pipeline is connected to a heat exchanger of the refrigerated display cabinet;
and in the defrosting mode, the air outlet of the first compressor is communicated with the heat exchanger of the refrigeration display cabinet through the bypass pipeline, and in the heating mode, the air outlet of the first compressor is communicated with the outdoor heat exchanger.
2. A cold storage device as claimed in claim 1, wherein a reversing device is provided at a first end of the bypass line, a first port of the reversing device is connected to the four-way valve, a second port of the reversing device is connected to the outdoor heat exchanger, and a third port of the reversing device is connected to the first end of the bypass line.
3. A cold storage unit as claimed in claim 1, wherein a first valve is provided in the connection between the first end of the bypass line and the outdoor heat exchanger, and a second valve is provided in the bypass line.
4. A cold storage device according to claim 2 or 3, wherein a third valve is provided on the bypass line, the third valve being connected between the reversing device and the second end of the bypass line, or the third valve being connected between the second valve and the second end of the bypass line.
5. A refrigerated merchandiser as recited in claim 1 wherein said refrigerated display case comprises: a second compressor having a discharge port connected to a suction port of the first compressor, the suction port of the second compressor being connected to a heat exchanger of the refrigerated display case.
6. A refrigerated merchandiser as recited in claim 1 wherein said refrigerated display case comprises: the refrigerating showcase throttling device is connected to one end, which is not connected with the bypass pipeline, of the heat exchanger of the refrigerating showcase.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120282777.7U CN214582000U (en) | 2021-02-01 | 2021-02-01 | Freezing and refrigerating device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120282777.7U CN214582000U (en) | 2021-02-01 | 2021-02-01 | Freezing and refrigerating device |
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| CN214582000U true CN214582000U (en) | 2021-11-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728848A (en) * | 2021-02-01 | 2021-04-30 | 珠海格力电器股份有限公司 | Freezing and refrigerating device and control method and control device thereof |
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2021
- 2021-02-01 CN CN202120282777.7U patent/CN214582000U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728848A (en) * | 2021-02-01 | 2021-04-30 | 珠海格力电器股份有限公司 | Freezing and refrigerating device and control method and control device thereof |
| CN112728848B (en) * | 2021-02-01 | 2024-06-14 | 珠海格力电器股份有限公司 | Freezing and refrigerating device, control method and control device thereof |
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