CN117647023A - Air conditioning unit and defrosting control method thereof - Google Patents
Air conditioning unit and defrosting control method thereof Download PDFInfo
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- CN117647023A CN117647023A CN202311762435.5A CN202311762435A CN117647023A CN 117647023 A CN117647023 A CN 117647023A CN 202311762435 A CN202311762435 A CN 202311762435A CN 117647023 A CN117647023 A CN 117647023A
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- 238000010257 thawing Methods 0.000 title claims abstract description 260
- 238000004378 air conditioning Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000003507 refrigerant Substances 0.000 claims abstract description 59
- 239000007788 liquid Substances 0.000 claims abstract description 49
- 238000001704 evaporation Methods 0.000 claims description 40
- 230000008020 evaporation Effects 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000005057 refrigeration Methods 0.000 abstract description 28
- 230000008569 process Effects 0.000 abstract description 11
- 230000007613 environmental effect Effects 0.000 abstract description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 5
- 229910052731 fluorine Inorganic materials 0.000 description 5
- 239000011737 fluorine Substances 0.000 description 5
- 239000012774 insulation material Substances 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 239000005457 ice water Substances 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process 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
- 238000004321 preservation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses an air conditioning unit and a defrosting control method thereof, wherein the air conditioning unit comprises: the evaporator is a parallel double evaporator and comprises a first evaporator and a second evaporator; the air conditioning unit further includes: the first defrosting branch comprises a first bypass pipeline and a first liquid return pipeline, the first defrosting branch is used for defrosting the first evaporator by adopting a refrigerant at the exhaust port of the compressor, and then the defrosted refrigerant is returned to the throttling device to be converged with the refrigerant entering the second evaporator; the second defrosting branch comprises a second bypass pipeline and a second liquid return pipeline, the second defrosting branch is used for defrosting the second evaporator by adopting the refrigerant at the exhaust port of the compressor, and then the defrosted refrigerant is returned to the throttling device to be combined with the refrigerant entering the first evaporator. The invention solves the problem of room temperature fluctuation caused by the traditional defrosting process in the prior art, and improves the refrigeration performance of the air conditioning unit and the environmental stability of the refrigeration house.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner unit and a defrosting control method thereof.
Background
The construction of the refrigeration house is more and more widely used in business, and the refrigeration technology is used for cooling and freezing products, so that the products are stored for a long time. When the stock is lower than 0 ℃, the evaporator is inevitably frosted, the continuous frosting of the evaporator seriously affects the refrigeration efficiency, and the refrigeration effect is poor. The traditional method generally adopts two methods of adding electric heating defrosting and thermal fluorination defrosting.
When the electric heating defrosting is adopted, external heat is introduced, so that the hot air is inevitably conveyed into the refrigeration house, the refrigeration house temperature of the refrigeration house is further increased, the temperature of the refrigeration house body is uneven, the preservation or damage of products is seriously affected, and the power consumption is high. When the traditional thermal fluoride frost is adopted, the whole system participates in defrosting operation, and no cold air is conveyed in the defrosting process, so that the warehouse temperature is also influenced.
Meanwhile, in the defrosting process, the traditional scheme cannot achieve accurate regional defrosting treatment no matter the electric heating scheme or the hot fluorine defrosting scheme, and once the evaporator is detected to be required to be defrosted, the defrosting treatment is carried out on the whole evaporator, so that the power consumption is high and the energy is wasted.
Particularly, the low-temperature refrigeration house adopts a traditional defrosting mode, which can lead to the re-condensation of ice crystal blocks and frost water which are melted and fall on the water receiving disc, and seriously affects the drainage.
Aiming at the problem that the traditional defrosting process causes the fluctuation of room temperature in the related art, no effective solution is proposed at present.
Disclosure of Invention
The invention provides an air conditioning unit and a defrosting control method thereof, which at least solve the problems in the prior art.
In order to solve the technical problem, according to an aspect of the embodiment of the present invention, there is provided an air conditioning unit, including a compressor, a condenser, a throttling device and an evaporator connected in sequence, the evaporator being a parallel dual evaporator, including a first evaporator and a second evaporator; the air conditioning unit further includes: the first defrosting branch comprises a first bypass pipeline and a first liquid return pipeline, one end of the first bypass pipeline is connected with an exhaust port of the compressor, the other end of the first bypass pipeline is connected with a refrigerant inlet of the first evaporator, one end of the first liquid return pipeline is connected with a refrigerant outlet of the first evaporator, the other end of the first liquid return pipeline is connected with a refrigerant inlet of the throttling device, the first defrosting branch is used for defrosting the first evaporator by adopting a refrigerant at the exhaust port of the compressor, and then the defrosted refrigerant is returned to the throttling device to be combined with the refrigerant entering the second evaporator; the second defrosting branch comprises a second bypass pipeline and a second liquid return pipeline, one end of the second bypass pipeline is connected with an exhaust port of the compressor, the other end of the second bypass pipeline is connected with a refrigerant inlet of the second evaporator, one end of the second liquid return pipeline is connected with a refrigerant outlet of the second evaporator, the other end of the second liquid return pipeline is connected with a refrigerant inlet of the throttling device, the second defrosting branch is used for defrosting the second evaporator by adopting a refrigerant of the exhaust port of the compressor, and then the defrosted refrigerant is returned to the throttling device to be combined with the refrigerant entering the first evaporator.
Further, a heat insulation material is filled between the first evaporator and the second evaporator; further comprises: the first water receiving disc is arranged below the first evaporator; the first defrosting coil pipe is arranged below the first water receiving disc and connected with a refrigerant inlet of the first evaporator, and the first bypass pipeline is connected with the first evaporator through the first defrosting coil pipe; the second water receiving disc is arranged below the second evaporator; the second defrosting coil pipe is arranged below the second water receiving disc and connected with a refrigerant inlet of the second evaporator, and the second bypass pipeline is connected with the second evaporator through the second defrosting coil pipe.
Further, the method further comprises the following steps: a first defrosting solenoid valve positioned on the pipeline between the first bypass pipeline and the first defrosting coil; a second defrosting solenoid valve positioned on the pipeline between the second bypass pipeline and the second defrosting coil; the first liquid supply electromagnetic valve is positioned on a pipeline between the throttling device and the first evaporator; the second liquid supply electromagnetic valve is positioned on a pipeline between the throttling device and the second evaporator; the first liquid return electromagnetic valve is positioned on the first liquid return pipeline; the second liquid return electromagnetic valve is positioned on the second liquid return pipeline; the first air return electromagnetic valve is positioned on a pipeline between a refrigerant outlet of the first evaporator and the compressor; the second air return electromagnetic valve is positioned on a pipeline between the refrigerant outlet of the second evaporator and the compressor.
Further, the first evaporator and the second evaporator comprise a plurality of sub-evaporation areas, and each sub-evaporation area is correspondingly provided with an evaporation temperature sensing bulb and an opening electromagnetic valve.
According to another aspect of the embodiment of the present invention, there is provided a defrosting control method for an air conditioning unit, which is applied to the air conditioning unit, and the method includes: acquiring temperature parameters of a first evaporator and a second evaporator of an air conditioning unit; wherein the temperature parameters at least comprise an evaporation temperature and a defrosting temperature; determining an evaporator meeting defrosting conditions according to the temperature parameters; and controlling the air conditioning unit to defrost according to the evaporator meeting the defrosting condition.
Further, determining an evaporator meeting a defrosting condition according to the temperature parameter, comprising: at the evaporating temperature T Evaporation Satisfy T Evaporation ≤T Room temperature －T Defrosting inlet temperature difference At the same time defrosting temperature T Defrosting agent Satisfy T in continuous preset time Defrosting agent ＜T Defrosting termination Determining the evaporating temperature T Evaporation And defrosting temperature T Defrosting agent The corresponding evaporator is an evaporator meeting defrosting conditions; wherein T is Room temperature T is the room temperature where the evaporator is located Defrosting inlet temperature difference To preset the defrosting inlet temperature T Defrosting termination Is to preset the defrosting end temperature.
Further, controlling the air conditioning unit to defrost according to the evaporator meeting the defrosting condition, including: when one evaporator meeting the defrosting conditions is adopted, controlling the evaporator meeting the defrosting conditions to defrost; and when the number of the evaporators meeting the defrosting conditions is two, controlling the first evaporator and the second evaporator to alternately defrost.
Further, controlling the evaporator meeting the defrosting condition to defrost, comprising: judging whether each sub-evaporation area of the evaporator meeting the defrosting condition meets the defrosting condition or not; and controlling the opening electromagnetic valve of the sub-evaporation area meeting the defrosting condition to be opened, and then entering defrosting control.
Further, entering defrosting control, comprising: and controlling the defrosting electromagnetic valve and the liquid return electromagnetic valve which correspond to the evaporator meeting the defrosting condition to be opened, and closing the corresponding liquid supply electromagnetic valve and the corresponding air return electromagnetic valve.
Further, controlling the first evaporator and the second evaporator to alternately defrost includes: when the first evaporator or the second evaporator is frosted, the other evaporator which is not frosted correspondingly reaches the down-frequency operation of the fan, and simultaneously the opening of the throttling device is controlled to be reduced.
According to yet another aspect of embodiments of the present invention, there is provided a storage medium containing computer executable instructions for performing an air conditioning unit defrosting control method as described above when executed by a computer processor.
The invention provides an air conditioning unit with double evaporators and a defrosting scheme thereof, wherein the air conditioning unit is provided with the double evaporators connected in parallel and corresponding defrosting branches, and the defrosting branches can realize continuous refrigeration of one evaporator during defrosting, so that the temperature fluctuation in a warehouse caused by defrosting is prevented, the stability of the warehouse temperature is kept, the problem of the fluctuation of the room temperature caused by the defrosting process in the prior art is effectively solved, and the refrigeration performance of the air conditioning unit and the environmental stability of a freezer are improved.
Drawings
FIG. 1 is a schematic view of an alternative configuration of an air conditioning unit according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of an alternative configuration of a dual evaporator according to an embodiment of the invention;
FIG. 3 is an alternative schematic illustration of evaporator zone division in accordance with an embodiment of the invention;
FIG. 4 is an alternative flow chart of a method of controlling defrosting of an air conditioning unit according to an embodiment of the present invention;
FIG. 5 is an alternative flow chart of a dual evaporator switching defrost control method in accordance with an embodiment of the present invention;
fig. 6 is an alternative flow chart of a zoned defrost control method in accordance with an embodiment of the present invention.
Reference numerals illustrate:
1. a compressor; 2. oil component; 3. a condenser; 4. a reservoir; 5. drying the filter; 6. an electronic expansion valve; 7. an evaporator; 71. a first evaporator; 72. a second evaporator; 8. a gas-liquid separator; 9. a first evaporator bottom defrosting coil; 10. a defrosting coil at the bottom of the second evaporator; 11. the first evaporator is provided with a fan, and the second evaporator is provided with a fan; s1, a second defrosting electromagnetic valve; s2, a first defrosting electromagnetic valve; s3, a first liquid supply electromagnetic valve; s4, a second liquid supply electromagnetic valve; s5, a second branch electromagnetic valve; s6, a first branch electromagnetic valve; s7, a first air return electromagnetic valve; s8, a second air return electromagnetic valve; 100. a first evaporator; 101. a heat insulating material; 102. a second evaporator; 103. a second defrosting pipe; 104. an evaporator lower guard plate; 105. a defrosting pipe fixing clamp; 106. a first defrosting pipe; 200. a liquid-dividing pipe main switch; 201. a liquid separating pipe; 202. an evaporator; 203. a gas collecting tube; 204. and a gas collecting tube main switch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention 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 invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the controllers in the embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish between controllers connected to different devices. For example, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller, without departing from the scope of embodiments of the invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such element.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
In a preferred embodiment 1 of the present invention, an air conditioning unit is provided, and in particular, fig. 1 shows an alternative structural schematic diagram of the unit, as shown in fig. 1, the unit includes:
the evaporator is a parallel double evaporator and comprises a first evaporator and a second evaporator;
the first defrosting branch comprises a first bypass pipeline and a first liquid return pipeline, one end of the first bypass pipeline is connected with an exhaust port of the compressor, the other end of the first bypass pipeline is connected with a refrigerant inlet of the first evaporator, one end of the first liquid return pipeline is connected with a refrigerant outlet of the first evaporator, the other end of the first liquid return pipeline is connected with a refrigerant inlet of the throttling device, the first defrosting branch is used for defrosting the first evaporator by adopting a refrigerant at the exhaust port of the compressor, and then the defrosted refrigerant is returned to the throttling device to be combined with the refrigerant entering the second evaporator;
the second defrosting branch comprises a second bypass pipeline and a second liquid return pipeline, one end of the second bypass pipeline is connected with an exhaust port of the compressor, the other end of the second bypass pipeline is connected with a refrigerant inlet of the second evaporator, one end of the second liquid return pipeline is connected with a refrigerant outlet of the second evaporator, the other end of the second liquid return pipeline is connected with a refrigerant inlet of the throttling device, the second defrosting branch is used for defrosting the second evaporator by adopting a refrigerant of the exhaust port of the compressor, and then the defrosted refrigerant is returned to the throttling device to be combined with the refrigerant entering the first evaporator.
In the embodiment, the air conditioning unit with the double evaporators and the defrosting scheme thereof are provided, the air conditioning unit is provided with the double evaporators connected in parallel and the corresponding defrosting branches, one evaporator can continue to refrigerate when defrosting through the defrosting branches, and the temperature fluctuation in the warehouse caused by defrosting is prevented, so that the stability of the warehouse temperature is maintained, the problem of the fluctuation of the room temperature caused by the defrosting process in the prior art is effectively solved, and the refrigeration performance of the air conditioning unit and the environmental stability of the refrigerator are improved.
Fig. 2 shows an alternative schematic structure of a dual evaporator, which is designed in parallel, and the structure of which is shown in fig. 2, including: 100—a first evaporator; 101-a heat insulation material; 102-a second evaporator; 103-a second defrosting coil; 104-evaporator lower guard board; 105-defrosting pipe fixing clips; 106-a first defrosting coil. The evaporator also comprises: the first water receiving disc is arranged below the first evaporator; the first defrosting coil pipe is arranged below the first water receiving disc and connected with a refrigerant inlet of the first evaporator, and the first bypass pipeline is connected with the first evaporator through the first defrosting coil pipe; the second water receiving disc is arranged below the second evaporator; the second defrosting coil pipe is arranged below the second water receiving disc and connected with a refrigerant inlet of the second evaporator, and the second bypass pipeline is connected with the second evaporator through the second defrosting coil pipe.
According to the design thought of the double evaporators, the double evaporators are designed in parallel, the double fans are of a structure and distributed left and right, the middle is filled with heat insulation materials, and defrosting coils are respectively arranged on lower guard plates of the double evaporators, so that the double evaporators can be respectively and independently controlled, one evaporator still keeps refrigeration when defrosting is realized, and the fluctuation of the temperature of a warehouse caused by external heating defrosting is prevented; in the defrosting process, hot fluorine preferentially enters the evaporator through the defrosting coil pipe to finish defrosting, so that the problems that melted frost blocks and ice water are excessively accumulated on the water receiving disc to cause secondary ice coagulation, water cannot be drained and the like are avoided. Particularly, the low-temperature refrigeration house adopts a traditional defrosting mode, which can lead to the re-condensation of ice crystal blocks and frost water which are melted and fall on the water receiving disc, and seriously affects the drainage.
To achieve defrosting control, further comprising:
a first defrosting solenoid valve positioned on the pipeline between the first bypass pipeline and the first defrosting coil;
a second defrosting solenoid valve positioned on the pipeline between the second bypass pipeline and the second defrosting coil;
the first liquid supply electromagnetic valve is positioned on a pipeline between the throttling device and the first evaporator;
the second liquid supply electromagnetic valve is positioned on a pipeline between the throttling device and the second evaporator;
the first liquid return electromagnetic valve is positioned on the first liquid return pipeline;
the second liquid return electromagnetic valve is positioned on the second liquid return pipeline;
the first air return electromagnetic valve is positioned on a pipeline between a refrigerant outlet of the first evaporator and the compressor;
the second air return electromagnetic valve is positioned on a pipeline between the refrigerant outlet of the second evaporator and the compressor.
Preferably, the first evaporator and the second evaporator comprise a plurality of sub-evaporation areas, and each sub-evaporation area is correspondingly provided with an evaporation temperature sensing bulb and an opening electromagnetic valve.
FIG. 3 is an alternative schematic illustration of evaporator area division, wherein 200-the manifold switch; 201—a liquid separation tube; 202-an evaporator; 203-gas collecting tube; 204—a header master switch; K1-K6 are electromagnetic switches on the gas collecting branch pipes respectively, and T1-T6 are evaporation temperature sensing bags on the flow paths 1-6 respectively. In the implementation, the evaporator may be divided into four regions according to the size of the evaporator, and in fig. 3, the evaporator is divided into four regions A, B, C, D, wherein region a includes flow paths 1 and 2, region b includes flow paths 2 and 3, region c includes flow paths 4 and 5, and region d includes flow paths 5 and 6.
The evaporator areas are divided, a temperature sensing bulb is added to each flow path, and the evaporation temperature of the flow paths in each area is detected, so that whether the area meets the defrosting condition is judged, and the accurate defrosting of the evaporator is completed.
In the invention, the dual-evaporator parallel design is adopted to carry out intelligent control on the dual-evaporator parallel design, so that when one evaporator is used for defrosting, the other evaporator is used for continuously refrigerating, thereby ensuring the stability of the warehouse temperature. Based on the intelligent control of the control valves on each branch, the free switching between the refrigeration and defrosting of each plate of the evaporator is realized according to actual needs. When defrosting, hot fluorine preferentially passes through the defrosting coil at the bottom and enters the evaporator to finish defrosting, so that the problems that the falling frost blocks and ice water are excessively accumulated in the water receiving disc to cause secondary condensation and water cannot be discharged and the like are avoided when defrosting. By respectively adding the electromagnetic switch on the inlet branch pipe of the evaporator during hot fluorine defrosting, the precise control of each human flow path is realized, meanwhile, the evaporator area is divided, and a temperature sensing bag is added in each flow path, so that the evaporation temperature on the flow path in each area is detected, and whether the area meets defrosting conditions is judged, and the precise defrosting of the evaporator is finished.
Example 2
In a preferred embodiment 2 of the present invention, there is provided a defrosting control method for an air conditioning unit, which is applied to the air conditioning unit in the above embodiment 1. Specifically, fig. 4 shows an alternative flow chart of the method, as shown in fig. 4, comprising the following steps S402-S406:
s402: acquiring temperature parameters of a first evaporator and a second evaporator of an air conditioning unit; wherein the temperature parameters at least comprise an evaporation temperature and a defrosting temperature;
s404: determining an evaporator meeting defrosting conditions according to the temperature parameters;
s406: and controlling the air conditioning unit to defrost according to the evaporator meeting the defrosting condition.
In the embodiment, the air conditioning unit with the double evaporators and the defrosting scheme thereof are provided, the air conditioning unit is provided with the double evaporators connected in parallel and the corresponding defrosting branches, one evaporator can continue to refrigerate when defrosting through the defrosting branches, and the temperature fluctuation in the warehouse caused by defrosting is prevented, so that the stability of the warehouse temperature is maintained, the problem of the fluctuation of the room temperature caused by the defrosting process in the prior art is effectively solved, and the refrigeration performance of the air conditioning unit and the environmental stability of the refrigerator are improved.
When the system is in normal refrigeration operation, the double-evaporator parallel design blocks participate in refrigeration, the system electromagnetic valves S1, S2, S5 and S6 are closed, the electromagnetic valves S3, S4, S7 and S8 are opened, the refrigerant is compressed by the compressor, enters the condenser to perform condensation heat exchange after entering the oil content, and flows through the electromagnetic valves S3 and S4 after being throttled by the electronic expansion valve, enters the two evaporator blocks 71 and 72 through the two branches after flowing through the electromagnetic valves S3 and S4, and enters the muffler through the electromagnetic valves S7 and S8 to return to the compressor for heat exchange refrigeration of the evaporator, and the refrigerant runs through the whole refrigeration system to realize refrigeration and freezing of the refrigeration house under the heat exchange effect of the condenser and the evaporator.
Wherein, confirm the evaporator which satisfies the defrosting condition according to the temperature parameter, include: at the evaporating temperature T Evaporation Satisfy T Evaporation ≤T Room temperature －T Defrosting inlet temperature difference At the same time defrosting temperature T Defrosting agent Satisfy T in continuous preset time Defrosting agent ＜T Defrosting termination Determining the evaporating temperature T Evaporation And defrosting temperature T Defrosting agent The corresponding evaporator is an evaporator meeting defrosting conditions; wherein T is Room temperature T is the room temperature where the evaporator is located Defrosting inlet temperature difference To preset the defrosting inlet temperature T Defrosting termination Is to preset the defrosting end temperature.
Because the evaporimeter is two evaporimeter designs, consequently two evaporimeters all need detect whether satisfy the defrosting condition, and the defrosting is carried out according to the testing result, and the control air conditioning unit of the evaporimeter that satisfies the defrosting condition promptly is defrosted, includes: when one evaporator meeting the defrosting conditions is adopted, controlling the evaporator meeting the defrosting conditions to defrost; and when the number of the evaporators meeting the defrosting conditions is two, controlling the first evaporator and the second evaporator to alternately defrost.
In a preferred embodiment of the present invention, controlling the evaporator satisfying the defrosting condition to defrost includes: judging whether each sub-evaporation area of the evaporator meeting the defrosting condition meets the defrosting condition or not; and controlling the opening electromagnetic valve of the sub-evaporation area meeting the defrosting condition to be opened, and then entering defrosting control. Entering defrosting control, comprising: and controlling the defrosting electromagnetic valve and the liquid return electromagnetic valve which correspond to the evaporator meeting the defrosting condition to be opened, and closing the corresponding liquid supply electromagnetic valve and the corresponding air return electromagnetic valve.
When the system detects the data of the double evaporators, if one evaporator reaches the defrosting condition and the other evaporator does not reach the condition, the evaporating temperature satisfies T after 3 minutes continuously Evaporation ≤(T Warehouse temperature －T Defrosting inlet temperature difference ) At the same time satisfy the continuous 10S detection of T Defrosting agent ＜T Defrosting termination Enters into defrosting, and the evaporator 71 reaches defrosting condition, the evaporator 72 does not existFor example, acquiring defrosting instructions, closing electromagnetic valves S1, S3, S5 and S7, and opening electromagnetic valves S2, S4, S6 and S8; in the refrigerating plate, the refrigerant enters the evaporator plate 72 from the condenser through the electronic expansion valve and enters the evaporator plate 72 through the electromagnetic valve S4 for heat exchange, and then returns to the compressor through the electromagnetic valve S8. In the defrosting plate, high-temperature refrigerant flows into the defrosting plate at the bottom of the evaporator plate 71 through the electromagnetic valve S2 and then enters the evaporator, so that secondary condensation caused by excessive frost accumulation blocks at the bottom of the defrosting plate is prevented, drainage is influenced, the influence of pipeline pressure change on a system is reduced, and the defrosted refrigerant returns to the condenser through the electromagnetic valve S6 and then to the front of the electronic expansion valve after exiting the evaporator.
In a preferred embodiment 2 of the present invention, there is also provided a dual evaporator switching defrosting control method, specifically, fig. 5 shows an alternative flowchart of the method, as shown in fig. 5, which includes the following steps S501-S510:
s501, detecting data;
s502 detection T Evaporation ≤(T Warehouse temperature -T Defrosting inlet temperature difference ) T is not less than 3min, whether the time is satisfied or not, and if yes, the step S503 is entered;
S503:T defrosting agent <T Defrosting termination ，t≥10s；
S504, defrosting the evaporator 71, and refrigerating the evaporator 72;
s505, the electromagnetic valves S1, S3, S5 and S7 are closed; the electromagnetic valves S2, S4, S6 and S8 are opened;
S506:T defrosting agent ≥T Defrosting termination If t is more than or equal to 10S, the step S507 is carried out, otherwise, the step S504 is returned;
s507, the electromagnetic valves S1, S3, S5 and S7 are opened; the electromagnetic valves S2, S4, S6 and S8 are closed;
s508, defrosting the evaporator 72; the evaporator 71 is cooled;
S509:T defrosting agent ≥T Defrosting termination If t is more than or equal to 10S, the step S510 is entered, otherwise, the step S507 is returned;
s510, opening electromagnetic valves S1, S2, S5 and S6; the solenoid valves S3, S4, S7, S8 are closed.
Fig. 6 shows an alternative flow chart of a zoned defrost control method, as shown in fig. 6, comprising:
s601, defrosting is carried out;
s602, acquiring a temperature value of a temperature sensing bulb;
s603, judging that the temperature value T of the temperature sensing bag is less than or equal to T, wherein T is a set value;
s604, reducing the frequency of the compressor;
and S605, defrosting the evaporator area meeting the defrosting condition.
When the evaporator meets the defrosting conditions, temperature sensing bulb data on all flow paths are acquired at the same time, whether the defrosting conditions are met in all areas of the evaporator or not is respectively judged, for example, temperature sensing bulbs T3 and T4 are smaller than set values, the fact that the area B, C meets the defrosting conditions is indicated, K1, K2 and K6 are closed, K3, K4 and K5 are opened, meanwhile, the frequency of a compressor is reduced, and therefore accurate defrosting of the evaporator is achieved, and traditional defrosting energy waste and influence on the warehouse temperature are effectively avoided.
When the evaporator 71 is in defrosting process, the 72 evaporator reaches defrosting condition, so as to avoid the problem of temperature rise caused by defrosting in the refrigeration house, the evaporator 71 continuously completes defrosting action, and the 72 evaporator continuously refrigerates; meanwhile, in order to avoid the problem that the evaporator 72 is excessively frosted and the subsequent defrosting is difficult, the opening degree of the electronic expansion valve is reduced, and the operation frequency of the air cooler 12 configured by the evaporator 72 is synchronously reduced; after the evaporator 71 finishes defrosting, the continuous 10S detection of T is satisfied Defrosting agent ≥T Defrosting termination The cooling mode is switched in and the evaporator 72 is switched in the defrosting mode.
In another preferred embodiment of the present invention, controlling the first evaporator and the second evaporator to alternately defrost includes: when the first evaporator or the second evaporator is frosted, the other evaporator which is not frosted correspondingly reaches the down-frequency operation of the fan, and simultaneously the opening of the throttling device is controlled to be reduced.
When the system detects evaporator data, when the double evaporators reach defrosting conditions, one evaporator is selected by default to defrost in advance in order to avoid the influence of fluctuation of the stock temperature during defrosting, the other evaporator continuously refrigerates, the opening of the electronic expansion valve is reduced, the running frequency of the corresponding configuration air cooler is reduced, and the frosting degree of the refrigeration evaporator is reduced. When the defrosting evaporator finishes defrosting, the refrigerating mode is switched into, and the other refrigerating evaporator synchronously switches into the defrosting mode.
According to the invention, by providing a design idea of double evaporators, the double evaporators are designed in parallel, are distributed left and right in a double-fan structure, are filled with heat insulation materials in the middle, and are respectively provided with a defrosting coil on a lower guard plate of each double evaporator, so that the double evaporators can be respectively and independently controlled, one evaporator can still keep refrigeration when defrosting, and the fluctuation of the temperature of a warehouse caused by external heating defrosting is prevented. In the defrosting process, hot fluorine preferentially enters the evaporator through the defrosting coil pipe to finish defrosting, so that the problems that melted frost blocks and ice water are excessively accumulated on the water receiving disc to cause secondary ice coagulation, water cannot be drained and the like are avoided. Meanwhile, the evaporator is divided into a plurality of areas, whether the area meets the defrosting condition is accurately judged by judging the evaporation temperature in each area, and meanwhile, the frequency of the compressor is reduced, so that the area meeting the condition is accurately defrosted.
Example 3
Based on the air conditioning unit defrosting control method provided in the above embodiment 2, there is also provided in a preferred embodiment 3 of the present invention a storage medium containing computer executable instructions which, when executed by a computer processor, are used to perform the air conditioning unit defrosting control method as described above.
In the embodiment, the air conditioning unit with the double evaporators and the defrosting scheme thereof are provided, the air conditioning unit is provided with the double evaporators connected in parallel and the corresponding defrosting branches, one evaporator can continue to refrigerate when defrosting through the defrosting branches, and the temperature fluctuation in the warehouse caused by defrosting is prevented, so that the stability of the warehouse temperature is maintained, the problem of the fluctuation of the room temperature caused by the defrosting process in the prior art is effectively solved, and the refrigeration performance of the air conditioning unit and the environmental stability of the refrigerator are improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (11)
1. The air conditioning unit comprises a compressor, a condenser, a throttling device and an evaporator which are sequentially connected, and is characterized in that the evaporator is a double evaporator which is connected in parallel and comprises a first evaporator and a second evaporator; the air conditioning unit further includes:
the first defrosting branch comprises a first bypass pipeline and a first liquid return pipeline, one end of the first bypass pipeline is connected with an exhaust port of the compressor, the other end of the first bypass pipeline is connected with a refrigerant inlet of the first evaporator, one end of the first liquid return pipeline is connected with a refrigerant outlet of the first evaporator, the other end of the first liquid return pipeline is connected with a refrigerant inlet of the throttling device, the first defrosting branch is used for defrosting the first evaporator by adopting a refrigerant at the exhaust port of the compressor, and then the defrosted refrigerant is returned to the throttling device to be converged with the refrigerant entering the second evaporator;
the second defrosting branch comprises a second bypass pipeline and a second liquid return pipeline, one end of the second bypass pipeline is connected with the exhaust port of the compressor, the other end of the second bypass pipeline is connected with the refrigerant inlet of the second evaporator, one end of the second liquid return pipeline is connected with the refrigerant outlet of the second evaporator, the other end of the second liquid return pipeline is connected with the refrigerant inlet of the throttling device, the second defrosting branch is used for defrosting the second evaporator by adopting the refrigerant at the exhaust port of the compressor, and then the defrosted refrigerant returns to the throttling device to be converged with the refrigerant entering the first evaporator.
2. The air conditioning unit according to claim 1, wherein a heat insulating material is filled between the first evaporator and the second evaporator; the air conditioning unit further includes:
the first water receiving disc is arranged below the first evaporator;
the first defrosting coil pipe is arranged below the first water receiving disc and connected with the refrigerant inlet of the first evaporator, and the first bypass pipeline is connected with the first evaporator through the first defrosting coil pipe;
the second water receiving disc is arranged below the second evaporator;
the second defrosting coil pipe is arranged below the second water receiving disc and connected with the refrigerant inlet of the second evaporator, and the second bypass pipeline is connected with the second evaporator through the second defrosting coil pipe.
3. The air conditioning assembly of claim 2, further comprising:
a first defrosting solenoid valve located on a line between the first bypass line and the first defrosting coil;
a second defrosting solenoid valve located on the line between the second bypass line and the second defrosting coil;
the first liquid supply electromagnetic valve is positioned on a pipeline between the throttling device and the first evaporator;
the second liquid supply electromagnetic valve is positioned on a pipeline between the throttling device and the second evaporator;
the first liquid return electromagnetic valve is positioned on the first liquid return pipeline;
the second liquid return electromagnetic valve is positioned on the second liquid return pipeline;
the first air return electromagnetic valve is positioned on a pipeline between the refrigerant outlet of the first evaporator and the compressor;
the second air return electromagnetic valve is positioned on a pipeline between the refrigerant outlet of the second evaporator and the compressor.
4. The air conditioning unit according to claim 1, wherein the first evaporator and the second evaporator each include a plurality of sub-evaporation areas, each of the sub-evaporation areas being provided with an evaporation bulb and an opening solenoid valve, respectively.
5. An air conditioning unit defrosting control method applied to the air conditioning unit according to any one of claims 1 to 4, characterized in that the method comprises:
acquiring temperature parameters of a first evaporator and a second evaporator of an air conditioning unit; wherein the temperature parameters at least comprise an evaporation temperature and a defrosting temperature;
determining an evaporator meeting defrosting conditions according to the temperature parameters;
and controlling the air conditioning unit to defrost according to the evaporator meeting the defrosting condition.
6. The method of claim 5, wherein determining an evaporator that satisfies a defrosting condition based on the temperature parameter comprises:
at the evaporation temperature T Evaporation Satisfy T Evaporation ≤T Room temperature －T Defrosting inlet temperature difference At the same time the defrosting temperature T Defrosting agent Satisfy T in continuous preset time Defrosting agent ＜T Defrosting termination Determining the evaporation temperature T Evaporation And the defrosting temperature T Defrosting agent The corresponding evaporator is the evaporator meeting the defrosting condition; wherein T is Room temperature T is the room temperature where the evaporator is located Defrosting inlet temperature difference To preset the defrosting inlet temperature T Defrosting termination Is to preset the defrosting end temperature.
7. The method of claim 5, wherein controlling the air conditioning unit to defrost according to the evaporator satisfying a defrost condition comprises:
when the number of the evaporators meeting the defrosting conditions is one, controlling the evaporators meeting the defrosting conditions to defrost;
and controlling the first evaporator and the second evaporator to alternately defrost when the number of the evaporators meeting the defrosting conditions is two.
8. The method of claim 6, wherein controlling the evaporator that satisfies a defrosting condition to defrost comprises:
judging whether each sub-evaporation area of the evaporator meeting the defrosting conditions meets the defrosting conditions or not;
and controlling the opening electromagnetic valve of the sub-evaporation area meeting the defrosting condition to be opened, and then entering defrosting control.
9. The method of claim 8, wherein the entering a defrosting control comprises:
and controlling the defrosting electromagnetic valve and the liquid return electromagnetic valve corresponding to the evaporator meeting the defrosting condition to be opened, and closing the corresponding liquid supply electromagnetic valve and the corresponding air return electromagnetic valve.
10. The method of claim 7, wherein controlling the first and second evaporators to alternately defrost comprises:
when the first evaporator or the second evaporator is frosted, the other evaporator which is not frosted correspondingly reaches the fan down-conversion operation, and simultaneously the opening of the throttling device is controlled to be reduced.
11. A storage medium containing computer executable instructions, which when executed by a computer processor are for performing the air conditioning unit defrosting control method of any one of claims 5 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311762435.5A CN117647023A (en) | 2023-12-20 | 2023-12-20 | Air conditioning unit and defrosting control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311762435.5A CN117647023A (en) | 2023-12-20 | 2023-12-20 | Air conditioning unit and defrosting control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117647023A true CN117647023A (en) | 2024-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311762435.5A Pending CN117647023A (en) | 2023-12-20 | 2023-12-20 | Air conditioning unit and defrosting control method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN117647023A (en) |
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2023
- 2023-12-20 CN CN202311762435.5A patent/CN117647023A/en active Pending
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