CN218955238U - Defrosting system and refrigerating unit - Google Patents
Defrosting system and refrigerating unit Download PDFInfo
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- CN218955238U CN218955238U CN202223218177.8U CN202223218177U CN218955238U CN 218955238 U CN218955238 U CN 218955238U CN 202223218177 U CN202223218177 U CN 202223218177U CN 218955238 U CN218955238 U CN 218955238U
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- 238000010257 thawing Methods 0.000 title claims abstract description 125
- 238000005338 heat storage Methods 0.000 claims abstract description 51
- 238000009825 accumulation Methods 0.000 claims abstract description 25
- 238000005057 refrigeration Methods 0.000 claims abstract description 19
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000003507 refrigerant Substances 0.000 description 13
- 238000009833 condensation Methods 0.000 description 9
- 230000005494 condensation Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- 229910052731 fluorine Inorganic materials 0.000 description 5
- 239000011737 fluorine Substances 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012782 phase change material Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004334 fluoridation Methods 0.000 description 1
- 238000003682 fluorination reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
The utility model discloses a defrosting system and a refrigerating unit. Wherein, this defrosting system is including compressor, cross valve, first heat exchanger, throttling element and the second heat exchanger that connects gradually, still includes: the heat storage device is connected in parallel with the first pipeline, the first pipeline is a connecting pipeline between the four-way valve and the first heat exchanger, and the heat storage device is used for storing heat during refrigeration and releasing heat during defrosting so as to heat air in the air supply device; the air supply device is used for spraying hot air to a preset position of the second heat exchanger during defrosting. According to the utility model, the heat storage device and the air supply device are utilized to carry out thermal defrosting, the four-way valve is utilized to change the direction to carry out thermal defrosting, and the interior and the exterior of the second heat exchanger are heated simultaneously in a defrosting mode combining thermal defrosting and hot air defrosting, so that the defrosting heat transfer efficiency is improved, the defrosting time is effectively shortened, the large fluctuation of the warehouse temperature caused by defrosting is avoided, the accumulation of frost at a preset position can be prevented, the defrosting is cleaner and more thorough, the condensing heat is recovered when the heat storage device is used for refrigerating, and the energy consumption is saved.
Description
Technical Field
The utility model relates to the technical field of defrosting, in particular to a defrosting system and a refrigerating unit.
Background
When the air cooler applied to the medium-low temperature refrigeration house normally operates, the fins are easy to frost, and the heat exchange area and the air output are reduced due to the frost or ice formation, so that the energy efficiency of the unit is reduced, and the unit cannot be effectively refrigerated.
The currently adopted defrosting method comprises the following steps: thermal fluoride defrosting, hot air defrosting and electric heating defrosting with four-way reversing valves.
In a live condition, the unit after stable operation is easy to generate a thicker frost layer at the lower part of an evaporator of the air cooler. The principle of the thermal fluoride frost is that after the compressor commutates, the inner high temperature thermal fluoride of the evaporator is utilized to gradually melt the external frost layer of the copper pipe, and when the defrosting is stopped and refrigeration is started, the defrosting at the bottom is not clean, and long-time operation leads to the accumulation of the ice layer at the bottom and needs to be shoveled.
The main heat transfer modes of pure hot air defrosting and electric heating defrosting have singleness, and have the advantages of high power consumption, small heat transfer quantity, long defrosting time and large fluctuation of the stock temperature in the defrosting process.
Aiming at the problems of long defrosting time, large fluctuation of the storage temperature and uncleanness of defrosting of a refrigerating unit in the prior art, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the utility model provides a defrosting system and a refrigerating unit, which at least solve the problems of long defrosting time, large fluctuation of storage temperature and unclean defrosting of the refrigerating unit in the prior art.
In order to solve the technical problem, an embodiment of the present utility model provides a defrosting system, including a compressor, a four-way valve, a first heat exchanger, a throttling element and a second heat exchanger, which are sequentially connected, the defrosting system further includes:
the heat storage device is connected in parallel with a first pipeline, the first pipeline is a connecting pipeline between the four-way valve and the first heat exchanger, and the heat storage device is used for storing heat during refrigeration and releasing heat during defrosting so as to heat air in the air supply device;
and the air supply device is used for spraying hot air to the preset position of the second heat exchanger during defrosting.
Optionally, the air supply device includes:
a jet section located at the second heat exchanger;
an air duct having a first end for introducing air and a second end connected to the air injection component;
the heat storage device is attached to the outside of the air duct.
Optionally, a heat pipe is arranged at a place where the heat storage device contacts with the air duct, an evaporation section of the heat pipe is arranged in the heat storage device, a condensation section of the heat pipe is arranged in the air duct, and a heat pipe valve is arranged between the evaporation section and the condensation section.
Optionally, the air injection component is located below or beside the second heat exchanger.
Optionally, under the condition that the air injection component is located below the second heat exchanger, the air injection component is of a groove structure, the groove is used for receiving water dripped from the second heat exchanger, and hole plates are arranged on bosses on two sides of the groove.
Optionally, the width of the groove is greater than or equal to the width of the fin of the second heat exchanger.
Optionally, the hole plate forms a preset inclination angle with the horizontal plane, and the hole on the hole plate faces the second heat exchanger.
Optionally, the first end of the air duct is disposed at a fan of the first heat exchanger.
Optionally, a first damper and a second damper are disposed at the first heat exchanger, the first damper and the second damper are not opened at the same time, when the first damper is opened, air driven by the fan flows through the first heat exchanger, and when the second damper is opened, air driven by the fan enters the air duct.
Optionally, a filter is disposed at the first end of the air duct.
Optionally, the first port of the heat storage device is connected to the first port of the first heat exchanger and the first end of the first pipeline through a first valve, and the second port of the heat storage device is connected to the four-way valve and the second end of the first pipeline through a second valve; the first pipeline is provided with a first opening adjusting element.
Optionally, a third windshield is arranged on the air inlet side of the second heat exchanger, and a fourth windshield is arranged on the air outlet side of the second heat exchanger.
Optionally, the defrosting system further comprises: the cold accumulation device is connected with the first heat exchanger in parallel and connected with a second pipeline in parallel, the second pipeline is a connecting pipeline between the throttling element and the second heat exchanger, and the cold accumulation device is used for accumulating cold during defrosting and releasing cold during refrigeration.
Optionally, the cold accumulation device includes:
the cold accumulation inlet is connected to the second port of the first heat exchanger through a third valve and a fourth valve in sequence;
the cold accumulation outlet is connected to the first port of the first heat exchanger through a fifth valve and a sixth valve in sequence;
the cooling inlet is connected to the first end of the second pipeline through a seventh valve;
the cooling outlet is connected to the second end of the second pipeline through an eighth valve;
and a second opening adjusting element is arranged on the second pipeline.
The embodiment of the utility model also provides a refrigerating unit, which comprises: the defrosting system provided by the embodiment of the utility model.
According to the technical scheme, the heat storage device and the air supply device are arranged, the heat storage device is connected in parallel to the first pipeline, the first pipeline is a connecting pipeline between the four-way valve and the first heat exchanger, the heat storage device stores heat during refrigeration and releases heat during defrosting to heat air in the air supply device, the air supply device sprays hot air to a preset position of the second heat exchanger during defrosting to perform thermal defrosting, and the four-way valve is utilized to conduct reversing for thermal defrosting, so that the defrosting mode of combining the thermal defrosting with the hot air defrosting is utilized, the internal high-temperature hot air and the external high-temperature hot air heat the frost layer at the same time, the internal and external high-temperature hot air heat the second heat exchanger at the same time, defrosting heat transfer efficiency can be improved, defrosting time is effectively reduced, the large fluctuation of the warehouse temperature caused by defrosting is avoided, the frost accumulation at the preset position can be prevented, defrosting is cleaner and thorough, and defrosting uniformity is ensured. In addition, the heat storage device recovers condensation heat during cooling and is used for heating air in the air supply device during defrosting, so that energy consumption can be saved.
Drawings
FIG. 1 is a schematic diagram of a defrosting system provided in embodiment 1 of the present utility model;
fig. 2 is a schematic diagram of heating air in an air duct of the heat storage device according to embodiment 1 of the present utility model;
FIG. 3 is a schematic view of a jet assembly according to embodiment 1 of the present utility model;
FIG. 4 is another schematic view of the defrosting system provided in embodiment 1 of the present utility model;
reference numerals illustrate:
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims and drawings of the present utility model are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented 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.
Alternative embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
Example 1
The embodiment provides a defrosting system, which can be applied to a refrigerating unit of a refrigeration house. Fig. 1 is a schematic diagram of a defrosting system provided in embodiment 1 of the present utility model, as shown in fig. 1, the defrosting system includes: the compressor 10, the four-way valve 20, the first heat exchanger 30 (i.e., an outdoor heat exchanger), the throttling element 40, and the second heat exchanger 50 (i.e., an indoor heat exchanger) which are sequentially connected form a refrigerant circulation loop, and when refrigeration is performed, the first heat exchanger 30 serves as a condenser, and the second heat exchanger 50 serves as an evaporator, and fins of the second heat exchanger 50 are prone to frosting. By reversing the four-way valve 20, the flow direction of the refrigerant can be changed to perform thermal frosting, at this time, the second heat exchanger 50 serves as a condenser, and the thermal fluorine in the second heat exchanger 50 releases heat and liquefies, so that the frost layer outside the second heat exchanger 50 can be melted.
The defrosting system further comprises: a heat storage device 60 and an air supply device 70.
The heat storage device 60 is connected in parallel to a first pipeline, and the first pipeline is a connecting pipeline between the four-way valve 20 and the first heat exchanger 30. The heat storage device 60 is configured to store heat during cooling and release heat during defrosting to heat air in the air supply device 70. The thermal storage device 60 may employ a phase change material.
The air supply device 70 is used for spraying hot air to a preset position of the second heat exchanger 50 during defrosting to perform thermal defrosting. The preset position refers to a position on the second heat exchanger 50 where frost is thicker, for example, a bottom of the second heat exchanger 50. The air supply device 70 supplies hot air to the second heat exchanger 50, and "///" in fig. 1 indicates corresponding positions connected to the air supply device 70.
The heat storage device 60 and the air supply device 70 are arranged in the embodiment, the heat storage device 60 is connected in parallel to a first pipeline, the first pipeline is a connecting pipeline between the four-way valve 20 and the first heat exchanger 30, the heat storage device 60 stores heat during refrigeration and releases heat during defrosting to heat air in the air supply device 70, the air supply device 70 sprays hot air to a preset position of the second heat exchanger 50 during defrosting to perform thermal defrosting, and the four-way valve 20 is utilized to reverse the thermal defrosting, so that the defrosting mode of combining the thermal defrosting with the thermal defrosting is utilized, the internal high-temperature hot air and the external high-temperature hot air heat simultaneously heat the frost layers, the internal and external of the second heat exchanger 50 are simultaneously heated, the defrosting heat transfer efficiency can be improved, the defrosting time is effectively reduced, the large fluctuation of the storage temperature caused by defrosting is avoided, the frost accumulation at the preset position can be prevented, the defrosting is cleaner and thorough, and the defrosting uniformity is ensured. The heat storage device 60 recovers condensation heat during cooling and heats air in the air supply device 70 during defrosting, thereby saving energy.
The air supply device 70 includes: jet part 71 and air duct 72. The injection part 71 is located at the second heat exchanger 50 to inject hot gas to a preset position of the second heat exchanger 50 at the time of defrosting. A first end of the air duct 72 is for introducing air, and a second end of the air duct 72 is connected to the air jetting member 71. The heat storage device 60 is attached to the outside of the air duct 72. With the above arrangement, it is possible to ensure that the heat storage device 60 heats the air inside the air duct 72 and sprays the hot air to the preset position of the second heat exchanger 50. Preferably, the thermal storage device 60 is attached to the bottom of the air tunnel 72.
The first end of the air supply device 70 introduces air by means of the driving of the blower, by means of which the air injection member 71 can inject hot air, although the inside of the air injection member 71 may be provided with a power member for providing power for injecting hot air.
As shown in fig. 2, a heat pipe 80 is disposed where the heat storage device 60 contacts the air duct 72, an evaporation section 81 of the heat pipe 80 is disposed in the heat storage device 60, a condensation section 82 of the heat pipe 80 is disposed in the air duct 72, specifically, the evaporation section 81 is completely immersed in the phase change material of the heat storage device 60, and the condensation section 82 can directly exchange heat with air in the air duct 72. A heat pipe valve 83 is provided between the evaporation section 81 and the condensation section 82, and whether the heat storage device 60 heats the air in the air duct 72 can be controlled by controlling the opening and closing of the heat pipe valve 83, and the heat pipe valve 83 is opened when defrosting and the heat pipe valve 83 is closed when refrigerating. Arrows in fig. 2 indicate the flow direction of air within the air duct 72.
The air injection part 71 may be located below or at a side of the second heat exchanger 50 as long as hot air can be injected to a preset position of the second heat exchanger 50 to thermally gasify frost. The hot gas is sprayed from a preset position (bottom or lower part) below or in a side direction of the second heat exchanger 50, the frost layers at the bottom and lower part of the second heat exchanger 50 are melted preferentially, and heat exchange is carried out between the hot gas and the frost layer at the upper middle layer in the rising process of the hot gas, so that the defrosting heat transfer efficiency can be improved, the defrosting time is shortened, and meanwhile, the frost accumulation at the bottom of the fins is prevented.
In the case that the air injection part 71 is located under the second heat exchanger 50, the air injection part 71 may have a groove structure, and as shown in fig. 3, the groove 73 is used to receive the defrost water dropped from the second heat exchanger 50 as a water receiving tray. The bosses 74 on two sides of the groove are provided with hole plates, each hole plate comprises at least one air jet hole 75, and the air jet holes 75 can be uniformly arranged. The solid arrows in fig. 3 indicate the flow direction of the defrost water, and the dashed arrows indicate the flow of the hot gas from the air duct 72 to the air injection component 71.
The width of the groove 73 is greater than or equal to the fin width of the second heat exchanger 50 to avoid the defrost water from falling into the air injection holes. The water receiving surface of the groove 73 may be planar or non-planar, for example, with the middle being higher than the periphery, to facilitate drainage.
The orifice plate is at a predetermined inclination angle to the horizontal with the orifice on the orifice plate facing a predetermined location of the second heat exchanger 50. The range of the preset inclination angle is [0, 90 ° ], and the optimal inclination angle can be determined according to the actual distance between the fins of the second heat exchanger 50 and the air injection part 71, so as to ensure that the hot air is smoothly injected to the preset position.
A first end of the air duct 72 may be located at a fan (which may be referred to as a condensing fan) of the first heat exchanger 30, i.e., the condensing fan is used to power the air duct 72, thereby avoiding additional fans leading to increased costs.
Further, the first heat exchanger 30 is provided with a first damper 31 and a second damper 32, the first damper 31 and the second damper 32 are not opened at the same time, when the first damper 31 is opened, air driven by the fan flows through the first heat exchanger 30, and when the second damper 32 is opened, air driven by the fan enters the air duct 72. The first damper 31 is closed and the second damper 32 is opened during defrosting, and the first damper 31 is opened and the second damper 32 is closed during cooling.
A first end of the air duct 72 is provided with a filter 76 for filtering air introduced into the air duct 72.
The first port of the heat storage device 60 is connected to the first port of the first heat exchanger 30 and the first end of the first pipe through the first valve 1, and the second port of the heat storage device 60 is connected to the four-way valve 20 and the second end of the first pipe through the second valve 2. Through the first valve 1 and the second valve 2, whether the refrigerant flows through the heat storage device 60 for heat storage can be controlled, when in refrigeration, the first valve 1 and the second valve 2 are opened, so that the heat storage device 60 can recover the exhaust heat of the compressor, and when the heat storage is detected to be finished, the first valve 1 and the second valve 2 can be closed; at defrosting, the first valve 1 and the second valve 2 are closed. Specifically, the temperature difference between the inlet and outlet of the heat storage device 60 can be detected, and when the temperature difference approaches 0 ℃, the completion of heat storage is indicated.
The first pipeline is provided with a first opening adjusting element 9 for balancing the resistance of the parallel branch circuit so as to avoid that the refrigerant completely flows through the first pipeline due to the excessively small resistance of the first pipeline and does not flow into the branch circuit where the heat storage device 60 is located. The first opening adjusting element 9 is opened both during cooling and defrosting. The specific opening of the first opening adjusting element 9 can be adjusted according to the actual demand of the refrigerant quantity.
In one embodiment, the air intake side of the second heat exchanger 50 is provided with a third damper and the air outlet side of the second heat exchanger 50 is provided with a fourth damper. The third damper and the fourth damper are adjustable, and the third damper and the fourth damper are closed to seal the second heat exchanger 50 against hot air being sprayed into the room during defrosting, thereby causing fluctuation in the storage temperature. During cooling, the third damper and the fourth damper are opened.
In one embodiment, as shown in fig. 4, the defrosting system may further include: the cold storage device 90 is connected in parallel with the first heat exchanger 30 and in parallel with a second pipeline, the second pipeline is a connecting pipeline between the throttling element 40 and the second heat exchanger 50, and the cold storage device 90 is used for cold storage during defrosting and cold release during refrigeration. The cold storage device 90 may employ a phase change material. In this embodiment, the cold accumulation device 90 recovers the cold energy in the defrosting process, and releases the cold energy during refrigeration, so that energy consumption can be saved.
The cold accumulation device 90 includes:
the cold accumulation inlet is connected to the second port of the first heat exchanger 30 through the third valve 3 and the fourth valve 4 in sequence;
the cold accumulation outlet is connected to the first port of the first heat exchanger 30 through a fifth valve 5 and a sixth valve 6 in sequence;
the cooling inlet is connected to the first end of the second pipeline through a seventh valve 7;
the cooling outlet is connected to the second end of the second pipeline through an eighth valve 8.
Whether the first heat exchanger 30 participates in the refrigerant circulation can be controlled through the fourth valve 4 and the sixth valve 6, and the cold accumulation device 90 can be controlled to accumulate or discharge cold through the third valve 3, the fifth valve 5, the seventh valve 7 and the eighth valve 8.
Specifically, when the reverse thermal fluoride is performed, the third valve 3 and the fifth valve 5 are opened, and the fourth valve 4, the sixth valve 6, the seventh valve 7 and the eighth valve 8 are closed, so that the cold storage device 90 serves as an evaporator to store the cold of the low-temperature refrigerant. During refrigeration, the third valve 3 and the fifth valve 5 are closed, the fourth valve 4, the sixth valve 6, the seventh valve 7 and the eighth valve 8 are opened, part of refrigerant flowing out of the first heat exchanger 30 enters the cold accumulation device 90, the cold accumulation device 90 releases cold energy, and when the cold energy of the cold accumulation device 90 is detected to be completely released, the seventh valve 7 and the eighth valve 8 can be closed. Specifically, the temperature difference between the inlet and outlet of the cold storage device 90 can be detected, and when the temperature difference approaches 0 ℃, the completion of the release of the cold energy is indicated.
The connection point of the first valve 1 to the first end of the first pipe is located between the first valve 1 and the sixth valve 6.
The second pipeline is provided with a second opening adjusting element 11 for balancing the resistance of the parallel branch circuit, so as to avoid that the refrigerant completely flows through the second pipeline due to the excessively small resistance of the second pipeline and does not flow into the branch circuit where the cold storage device 90 is located. The second opening degree adjustment element 11 is opened both during cooling and defrosting. The specific opening degree of the second opening degree adjusting element 11 can be adjusted according to the actual demand of the refrigerant amount.
The first valve 1, the second valve 2, the third valve 3, the fourth valve 4, the fifth valve 5, the sixth valve 6, the seventh valve 7 and the eighth valve 8 are all valves capable of automatically controlling on-off. The first opening degree adjusting element 9 and the second opening degree adjusting element 11 may be opening degree adjustable devices such as an electronic expansion valve.
The present embodiment provides a defrosting system combining reverse hot fluorine and hot gas, and in the unit operation process, the throttling element 40, the first opening adjusting element 9 and the second opening adjusting element 11 are all opened no matter refrigerating or defrosting.
Taking fig. 4 as an example, the thermal fluorine system operates as follows:
during the cooling operation, only the third valve 3 and the fifth valve 5 are closed and the remaining valves are opened. The high-temperature gas discharged by the compressor 10 is divided into two paths, one path directly enters the first heat exchanger 30 through the first opening adjusting element 9, the other path flows through the heat storage device 60, the heat storage device 60 collects the exhaust heat of the compressor 10, and when the heat storage device 60 is detected to store heat, the first valve 1 and the second valve 2 are closed. The low-temperature and low-pressure liquid throttled and depressurized by the throttle element 40 is divided into two paths, one path returns to the second heat exchanger 50 through the second opening adjusting element 11, the other path returns to the second heat exchanger 50 through the cold accumulation device 90, and when the cold accumulation device 90 is detected to be completely released, the seventh valve 7 and the eighth valve 8 are closed. The opening of the throttling element 40 can be automatically adjusted according to the temperature value of the liquid supply main pipe before entering the second heat exchanger 50.
When the defrosting mode is entered, only the third valve 3 and the fifth valve 5 are opened, the other valves are closed, the four-way valve 20 is reversed, the refrigerant circulation loop runs according to the heating flow direction, the high-temperature gas discharged by the compressor 10 enters the second heat exchanger 50, the high-temperature hot fluorine in the second heat exchanger 50 releases heat and liquefies, and the cold accumulation device 90 replaces the original first heat exchanger 30 to serve as an evaporator so as to store the cold of the low-temperature refrigerant. The refrigerant flow direction of the thermal fluoridation cream is as follows: compressor 10→four-way valve 20→second heat exchanger 50→second opening adjusting element 11→throttling element 40→third valve 3→cold storage device 90→fifth valve 5→first opening adjusting element 9→four-way valve 20→compressor 10. And after defrosting is finished, the refrigerating operation is recovered, the corresponding valve is opened or closed, and the next cycle is started.
The operation of the hot gas system is as follows:
in the cooling operation, the first damper 31 is opened, the second damper 32 is closed, the heat storage device 60 absorbs the exhaust heat of the compressor 10, and the heat pipe valve 83 is closed.
When the defrosting mode is entered, the first windshield 31 is closed, the second windshield 32 is opened, the heat pipe valve 83 is opened, the condensing fan continuously rotates, filtered condensed hot air exchanges heat with the condensing section 82 of the heat pipe 80 in the air duct 72, and relatively high-temperature condensed hot air sprays the heat exchanger coil through the air spraying holes 75 below the second heat exchanger 50 to realize hot defrosting. The air inlet and outlet sides of the second heat exchanger 50 are provided with adjustable windshields which are closed during defrosting to seal the second heat exchanger 50.
The phase change energy storage through the heat storage device 60 can recover condensation heat during refrigeration for heating air during defrosting, and the phase change energy storage through the cold storage device 90 can recover generated cold energy during defrosting for refrigeration operation, so that energy consumption is saved, and the whole unit has energy conservation.
According to the embodiment, defrosting can be achieved by combining hot fluorine and hot gas at the same time, and under the condition that one defrosting mode cannot be executed due to faults, defrosting can still be achieved smoothly by using the other defrosting mode, so that the problem that when a unit adopts a single defrosting system, reliability is poor due to the fact that defrosting cannot be achieved if main parts of the system are faulty is avoided, and reliability of unit defrosting is effectively improved.
For example, if the four-way valve 20 cannot be reversed after the satisfaction of the defrosting entry condition is detected, the defrosting is thermally gasified only by the air supply device 70; if the air supply device 70 cannot operate normally, the four-way valve 20 is controlled only to perform thermal fluorination. Specifically, a bulb and an air volume detection device may be installed at a position close to the air injection part 71 in the air duct 72, and if the bulb temperature T'. Gtoreq.t is detected after the defrosting condition is satisfied 0 ' and the air quantity Q is more than or equal to Q 0 It is determined that the hot gas system is converted normally and the gas supply device 70 can be operated normally. T (T) 0 ' denotes a preset reference temperature, Q 0 Indicating the preset air quantity.
Example 2
The present embodiment provides a refrigeration unit, including: the defrosting system of the above embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (15)
1. The utility model provides a defrosting system, includes compressor, cross valve, first heat exchanger, throttling element and second heat exchanger that connects gradually, its characterized in that, defrosting system still includes:
the heat storage device is connected in parallel with a first pipeline, the first pipeline is a connecting pipeline between the four-way valve and the first heat exchanger, and the heat storage device is used for storing heat during refrigeration and releasing heat during defrosting so as to heat air in the air supply device;
and the air supply device is used for spraying hot air to the preset position of the second heat exchanger during defrosting.
2. The defrosting system of claim 1, wherein the air supply device comprises:
a jet section located at the second heat exchanger;
an air duct having a first end for introducing air and a second end connected to the air injection component;
the heat storage device is attached to the outside of the air duct.
3. The defrosting system of claim 2 wherein a heat pipe is disposed where the heat storage device contacts the air duct, an evaporator section of the heat pipe is disposed in the heat storage device, a condenser section of the heat pipe is disposed in the air duct, and a heat pipe valve is disposed between the evaporator section and the condenser section.
4. The defrosting system of claim 2 wherein the air injection unit is located below or to the side of the second heat exchanger.
5. The defrosting system of claim 4 wherein, in the case where the air injection component is located below the second heat exchanger, the air injection component is in a groove structure, the groove is used for receiving water dripped from the second heat exchanger, and hole plates are arranged on bosses on two sides of the groove.
6. The defrosting system of claim 5 wherein the width of the groove is greater than or equal to the fin width of the second heat exchanger.
7. The defrosting system of claim 5 wherein the orifice plate is at a predetermined oblique angle to the horizontal, the orifice on the orifice plate facing the second heat exchanger.
8. The defrosting system of claim 2 wherein the first end of the air duct is disposed at a fan of the first heat exchanger.
9. The defrosting system of claim 8 wherein a first damper and a second damper are provided at the first heat exchanger, the first damper and the second damper not being simultaneously open, the fan-driven air flowing through the first heat exchanger when the first damper is open, the fan-driven air entering the air tunnel when the second damper is open.
10. The defrosting system of claim 2 wherein the first end of the air tunnel is provided with a filter.
11. The defrosting system of claim 1 wherein a first port of the heat storage device is connected to a first port of the first heat exchanger and a first end of the first tube through a first valve and a second port of the heat storage device is connected to a second end of the first tube and the four-way valve through a second valve; the first pipeline is provided with a first opening adjusting element.
12. The defrosting system of any one of claims 1 to 11 wherein the air inlet side of the second heat exchanger is provided with a third windshield and the air outlet side of the second heat exchanger is provided with a fourth windshield.
13. The defrosting system of any one of claims 1 to 11, further comprising:
the cold accumulation device is connected with the first heat exchanger in parallel and connected with a second pipeline in parallel, the second pipeline is a connecting pipeline between the throttling element and the second heat exchanger, and the cold accumulation device is used for accumulating cold during defrosting and releasing cold during refrigeration.
14. The defrosting system of claim 13 wherein the cold storage device comprises:
the cold accumulation inlet is connected to the second port of the first heat exchanger through a third valve and a fourth valve in sequence;
the cold accumulation outlet is connected to the first port of the first heat exchanger through a fifth valve and a sixth valve in sequence;
the cooling inlet is connected to the first end of the second pipeline through a seventh valve;
the cooling outlet is connected to the second end of the second pipeline through an eighth valve;
and a second opening adjusting element is arranged on the second pipeline.
15. A refrigeration unit, comprising: the defrosting system of any one of claims 1 to 14.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223218177.8U CN218955238U (en) | 2022-12-01 | 2022-12-01 | Defrosting system and refrigerating unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223218177.8U CN218955238U (en) | 2022-12-01 | 2022-12-01 | Defrosting system and refrigerating unit |
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| CN218955238U true CN218955238U (en) | 2023-05-02 |
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| CN202223218177.8U Active CN218955238U (en) | 2022-12-01 | 2022-12-01 | Defrosting system and refrigerating unit |
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