CN109629206B - Drying device and operation method thereof - Google Patents
Drying device and operation method thereof Download PDFInfo
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- CN109629206B CN109629206B CN201910119582.8A CN201910119582A CN109629206B CN 109629206 B CN109629206 B CN 109629206B CN 201910119582 A CN201910119582 A CN 201910119582A CN 109629206 B CN109629206 B CN 109629206B
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- dehumidification
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- 238000001035 drying Methods 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000007791 dehumidification Methods 0.000 claims abstract description 132
- 238000001704 evaporation Methods 0.000 claims description 82
- 230000008020 evaporation Effects 0.000 claims description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 65
- 239000007921 spray Substances 0.000 claims description 41
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical group [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 18
- 239000000498 cooling water Substances 0.000 claims description 10
- 239000002250 absorbent Substances 0.000 claims description 8
- 230000002745 absorbent Effects 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 2
- 239000003230 hygroscopic agent Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 7
- 238000011282 treatment Methods 0.000 abstract description 4
- 239000003507 refrigerant Substances 0.000 description 19
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/20—General details of domestic laundry dryers
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/30—Drying processes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/02—Characteristics of laundry or load
- D06F2103/08—Humidity
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
- D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a drying device and an operation method thereof, wherein the drying device comprises an air circulation system, a main dehumidification system and an auxiliary dehumidification system, and the main dehumidification system and the auxiliary dehumidification system can respectively exchange heat with the air circulation system; the auxiliary dehumidification system is provided with an on state for dehumidification in cooperation with the main dehumidification system and an off state for dehumidification stopping. Above-mentioned drying equipment, in the stoving earlier stage, auxiliary dehumidification system can be the open state, and the high temperature high humidity air of carrying the moisture of being dried in the air circulation system forms low temperature low humidity air through auxiliary dehumidification system and main dehumidification system's twice dehumidification cooling treatment to can continue the stoving to be dried thing, have good drying efficiency. In the later drying stage, the auxiliary dehumidifying system can be in a closed state and only adopts the main dehumidifying system to exchange heat with the air of the air circulating system, so that the problem that the refrigerating capacity of the main dehumidifying system cannot be fully utilized is avoided.
Description
Technical Field
The invention relates to the field of heat exchange devices, in particular to a drying device and an operation method of the drying device.
Background
With the development of society and the progress of science and technology, the requirements of people on life quality are also increasing, and more household appliances with different functions gradually enter the life of people. The clothes dryer is used as a household appliance for drying textiles such as clothes, towels and bedclothes, gradually goes into more and more families, and the clothes dried by the dryer do not need to be naturally dried, so that great convenience is brought to the life of people, and the labor burden of the housework of the people is reduced.
The dryer mainly comprises a condensing dryer, a heat pump dryer and the like, wherein the heat pump dryer is favored by more and more consumers due to the characteristics of higher drying efficiency, better drying effect, lower energy consumption and the like. The basic drying principle of the heat pump dryer is as follows: firstly, the refrigerant circulation system heats the air with lower humidity in the clothes drying air duct into high-temperature low-humidity air, then the high-temperature low-humidity air is introduced into the clothes drying barrel by using the fan, and the high-temperature low-humidity air absorbs and takes away the moisture in the to-be-dried object in the clothes drying barrel, so that the drying of the to-be-dried object is completed. And the air with higher humidity discharged from the clothes drying barrel is dehumidified by the refrigerant circulating system and changed into low-humidity air again to carry out a new cycle of circulation.
In the drying process, particularly in the early stage of drying, the water content of the dried object is high, and more free water exists, so that the dried object is easily taken away by relatively high-temperature low-humidity air, and the part of wet load needs a refrigerant circulation system to provide relatively large refrigerating capacity in the cooling and dehumidifying process. If the refrigerating capacity of the refrigerant circulation system is too small, the air with higher humidity is difficult to be changed into low-humidity air again, so that the drying effect is affected. In the later drying stage, the water content of the dried object is small, the water exists in the dried object in a combined water state, the air moisture content after evaporation and vaporization is small, and a refrigeration system is required to provide relatively small refrigeration capacity. However, the current heat pump dryer has relatively weak adjustment of the refrigerating capacity, and cannot be matched with two working conditions with larger phase difference, so that the refrigerating capacity is difficult to adjust to a lower level in the later drying stage to fully utilize the refrigerating capacity while ensuring higher drying efficiency in the earlier drying stage, thereby improving the energy consumption of the dryer, increasing the use cost of the dryer and weakening the drying uniformity.
Disclosure of Invention
Based on this, it is necessary to provide a drying apparatus and an operation method thereof that can ensure a high drying efficiency in the early drying stage while not having a refrigeration capacity that cannot be fully utilized in the late drying stage, in order to solve the problem that it is difficult for the dryer to fully utilize the refrigeration capacity in the late drying stage while ensuring a high drying efficiency in the early drying stage.
A drying apparatus comprising an air circulation system, a primary dehumidification system and an auxiliary dehumidification system, the primary and auxiliary dehumidification systems being respectively heat exchangeable with the air circulation system;
the auxiliary dehumidification system is provided with an opening state for being matched with the main dehumidification system to dehumidify and a closing state for stopping dehumidification.
In the above drying apparatus, in the early drying stage, the auxiliary dehumidifying system may be in an on state, and the high-temperature and high-humidity air carrying the moisture of the dried object in the air circulating system 20 forms low-temperature and low-humidity air through the two dehumidifying and cooling treatments of the auxiliary dehumidifying system and the main dehumidifying system, so that the dried object can be continuously dried, and the drying apparatus has good drying efficiency, shortens the drying time, and reduces the loss to the clothes. In the later drying stage, the auxiliary dehumidifying system can be in a closed state and only adopts the main dehumidifying system to exchange heat with the air of the air circulating system, so that the problem that the refrigerating capacity of the main dehumidifying system cannot be fully utilized is avoided, the operation load of the drying equipment is reduced, the energy consumption of the drying equipment is reduced, and the drying uniformity is improved.
In one embodiment, the auxiliary dehumidification system is in the on state when a first humidity of air in the air circulation system before being dehumidified by the main dehumidification system is greater than or equal to a first preset humidity.
In one embodiment, when the first humidity of the air in the air circulation system before being dehumidified by the main dehumidification system is greater than or equal to the second preset humidity, and the humidity difference between the air in the air circulation system before being dehumidified by the main dehumidification system and the air after being dehumidified by the main dehumidification system is less than the preset humidity difference, the auxiliary dehumidification system is in the on state.
In one embodiment, the auxiliary dehumidification system is in the closed state when the first humidity of the air in the air circulation system before being dehumidified by the main dehumidification system is less than a third preset humidity and/or the humidity difference of the air in the air circulation system before and after being dehumidified by the main dehumidification system is greater than or equal to a preset humidity difference.
In one embodiment, the auxiliary dehumidifying system comprises a spray evaporating module and a moisture absorbing module, when the auxiliary dehumidifying system is in an on state, the spray evaporating module exchanges heat with the air circulating system through spray cooling water, and the moisture absorbing module absorbs water vapor generated by the spray evaporating module in the heat exchanging process.
In one embodiment, the moisture absorption module comprises a moisture absorbent for absorbing water vapor generated by the spray evaporation module during heat exchange.
In one embodiment, the hygroscopic agent is a lithium bromide solution.
In one embodiment, the desiccant may exchange heat with the primary dehumidification system to increase concentration when the secondary dehumidification system is in the off state.
In one embodiment, the main dehumidification system includes a condensate storage structure for storing condensate, the condensate storage structure in communication with the spray evaporation module through a conduit to deliver condensate to the spray evaporation module.
In one embodiment, the spray evaporation module comprises a spray evaporation unit and a water storage unit connected with the condensed water storage structure through a pipeline, and the condensed water storage structure is connected with the water storage unit and an external water source through a pipeline.
A method of operating a drying apparatus, comprising the steps of:
acquiring a first humidity of air in an air circulation system before the air is dehumidified by a main dehumidification system;
comparing the first humidity with a first preset humidity;
and when the first humidity is greater than or equal to the first preset humidity, the auxiliary dehumidification system is started and is matched with the main dehumidification system for dehumidification.
In one embodiment, the operation method of the drying apparatus further includes the steps of:
acquiring humidity difference of air in the air circulation system before and after dehumidification by the main dehumidification system;
comparing the humidity difference with a preset humidity difference;
and when the first humidity is greater than or equal to the second preset humidity and the humidity difference is smaller than the preset humidity difference, the auxiliary dehumidification system is started and is matched with the main dehumidification system for dehumidification.
In one embodiment, the operation method of the drying apparatus further includes the steps of:
acquiring humidity difference of air in the air circulation system before and after dehumidification by the main dehumidification system;
comparing the humidity difference with a preset humidity difference;
and when the first humidity is smaller than a third preset humidity and/or the humidity difference is larger than or equal to a preset humidity difference, the auxiliary dehumidification system is in the closed state.
In one embodiment, the operation method of the drying apparatus further includes the steps of:
detecting dryness of the dried object in the air circulation system;
when the dryness of the dried object in the air circulation system is larger than the preset dryness, the moisture absorption module of the auxiliary dehumidification system can exchange heat with the main dehumidification system.
In one embodiment, the operation method of the drying apparatus further includes the steps of:
and detecting the water quantity in the spraying evaporation module of the auxiliary dehumidification system, wherein the auxiliary dehumidification system is in an openable state when the water quantity in the spraying evaporation module is larger than the preset water quantity.
Drawings
Fig. 1 is a schematic diagram of a drying apparatus according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating an operation method of the drying apparatus of fig. 1.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a drying apparatus 100 according to an embodiment of the present invention, in particular, in the following embodiments, the drying apparatus 100 is a heat pump type dryer for drying textiles such as laundry. It is understood that in other embodiments, the drying apparatus 100 may be a heat pump type washing and drying integrated machine.
The drying apparatus 100 includes an air circulation system 20, a main dehumidification system 40 and an auxiliary dehumidification system 60, wherein the main dehumidification system 40 and the auxiliary dehumidification system 60 can respectively exchange heat with the air circulation system 20, so as to heat, cool, dehumidify and the like the air in the air circulation system 20, and complete drying of the dried object. The auxiliary dehumidifying system 60 has an on state for dehumidifying in cooperation with the main dehumidifying system 40 and an off state for stopping dehumidifying, and is switchable between the on state and the off state according to the operating state of the main dehumidifying system 40.
In this way, in the early drying stage, the auxiliary dehumidification system 60 may be in an on state, and the high-temperature and high-humidity air carrying the moisture of the dried object in the air circulation system 20 forms low-temperature and low-humidity air through the two dehumidification cooling treatments of the auxiliary dehumidification system 60 and the main dehumidification system 40, so that the dried object can be continuously dried, the drying efficiency is good, the drying time is shortened, and the loss to the clothes is reduced. In the latter drying stage, the auxiliary dehumidifying system 60 may be in a closed state and only adopts the main dehumidifying system 40 to exchange heat with the air of the air circulation system 20, so that the problem that the refrigerating capacity of the main dehumidifying system 40 cannot be fully utilized is avoided, the operation load of the drying apparatus 100 is reduced, the energy consumption of the drying apparatus 100 is reduced, and the drying uniformity is improved.
The air circulation system 20 includes an air circulation duct 21, a blower 23 provided in the air circulation duct 21, a drying unit 25, and a fiber filter 27, and the air circulation system 20 forms a closed loop, and air reciprocally flows in the air circulation duct 21 and the drying unit 25 to dry the object to be dried.
In particular, in some embodiments, the drying unit 25 is a drying tub for accommodating the dried object, and the drying tub may be continuously rotated to tumble-dry the laundry in the drying tub. The low-humidity air in the air circulation pipeline 21 is firstly subjected to heat exchange with the main dehumidification system 40 to be heated to become high-temperature low-humidity air, the high-temperature low-humidity air is conveyed into the drying unit 25 through the fan 23, moisture in the dried object is absorbed by the high-temperature low-humidity air in the drying unit 25 to become high-temperature high-humidity air, the high-temperature high-humidity air flows out of the drying unit 25 and then enters the air circulation pipeline 21 again through the fiber filter 27, the high-temperature high-humidity air can be subjected to heat exchange with the main dehumidification system 40 to become low-temperature low-humidity air to complete one-time circulation, and the high-temperature high-humidity air can be subjected to heat exchange with the auxiliary dehumidification system 60 and the main dehumidification system 40 successively to become low-temperature low-humidity air to complete one-time circulation. In this way, the air in the air circulation system 20 repeatedly circulates to continuously take away the moisture of the dried object in the drying unit 25, thereby completing the drying operation.
The main dehumidification system 40 includes a compressor 41, a condensation module 42, a throttling module 43, and an evaporation module 44, which are sequentially connected, wherein the compressor 41, the condensation module 42, the throttling module 43, and the evaporation module 44 together form a refrigerant circulation channel, and the refrigerant flows in the refrigerant circulation channel to exchange heat with the air circulation system 20.
Specifically, the compressor 41 outputs a high-temperature and high-pressure gaseous refrigerant to the condensation module 42, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the low-temperature and low-humidity air in the air circulation pipeline 21 in the condensation module 42, the high-temperature and high-pressure gaseous refrigerant is liquefied into a low-temperature and high-pressure liquid refrigerant (the air in the air circulation pipeline 21 absorbs heat to become the high-temperature and low-humidity air at this time), the low-temperature and high-pressure liquid refrigerant enters the throttling module 43 to throttle and become the low-temperature and low-pressure liquid refrigerant and then enters the evaporation module 44, the low-temperature and low-pressure liquid refrigerant exchanges heat with the high-temperature and high-humidity air in the air circulation pipeline 21 in the evaporation module 44, the low-temperature and low-pressure liquid refrigerant absorbs heat in the high-temperature and high-humidity air to evaporate into a low-temperature and low-pressure gaseous refrigerant (the air in the air circulation pipeline 21 absorbs heat to liquefy to become the low-temperature and low-humidity air at this time), and the gaseous refrigerant returns to the compressor 41, thereby one-time refrigerant circulation is completed. The refrigerant circulation process may be reciprocally performed so as to continuously exchange heat with the air circulation system 20.
In the above drying process, the air in the air circulation duct 21 has the first humidity before flowing through the evaporation module 44, and since the moisture content of the dried object is higher in the early drying stage, the value of the first humidity of the air flowing through the evaporation module 44 through the air circulation duct 21 after passing through the drying unit 25 is too high, and the main dehumidification system 40 is required to provide a larger refrigerating capacity for effectively dehumidifying the air with the too high humidity to become low humidity air. In the latter stage of drying, the moisture content of the dried object is smaller, so that the first humidity value of the air flowing through the evaporation module 44 via the air circulation duct 21 after passing through the drying unit 25 is smaller, and only the main dehumidification system 40 is required to provide a smaller refrigerating capacity for effectively dehumidifying the air with lower humidity to become low-humidity air. At present, the adjustment capability of the cooling capacity of the drying apparatus 100 is weak, and it is difficult to match the two working conditions with large differences, so that the drying effect in the early drying stage cannot be better and the cooling capacity in the late drying stage can be fully utilized.
Accordingly, the present invention provides an auxiliary dehumidifying system 60 which can assist the main dehumidifying system 40 in dehumidifying to stepwise increase the dehumidifying capacity of the drying apparatus 100.
In particular, in some embodiments, in the early drying stage, when the first humidity of the air in the air circulation duct 21 before being dehumidified by the evaporation module 44 is greater than or equal to the first preset humidity, the humidity of the air exceeds the dehumidification capacity of the evaporation module 44, so that the auxiliary dehumidification system 60 is in an on state to pre-treat the air, thereby reducing the humidity of the air flowing through the evaporation module 44. In the latter drying stage, when the first humidity of the air in the air circulation duct 21 before being dehumidified by the evaporation module 44 is less than the third preset humidity (the third preset humidity may be equal to or less than the first preset humidity), the humidity of the air flowing through the evaporation module 44 does not exceed the dehumidification capacity of the evaporation module 44, so that the auxiliary dehumidification system 60 is in a closed state, and effective dehumidification can be performed only by the evaporation module 44. The first preset humidity is the maximum humidity that reaches the upper limit of the dehumidification capability of the evaporation module 44.
In particular, in other embodiments, in the early drying stage, when the first humidity of the air in the air circulation duct 21 before being dehumidified by the evaporation module 44 is greater than or equal to the second preset humidity, and the humidity difference between the air in the air circulation duct 21 before and after being dehumidified by the evaporation module 44 is less than the preset humidity difference, the humidity of the air exceeds the processing capacity of the evaporation module 44, so that the auxiliary dehumidification system 60 is in an on state to pre-process the air. In the latter drying stage, when the first humidity of the air in the air circulation duct 21 before being dehumidified by the evaporation module 44 is less than the third preset humidity (the third preset humidity may be equal to or less than the second preset humidity), and/or the humidity difference between the air in the air circulation duct 21 before and after being dehumidified by the evaporation module 44 is greater than or equal to the preset humidity difference, the humidity of the air does not exceed the dehumidification capacity of the evaporation module 44, so that the auxiliary dehumidification system 60 is in the off state, and efficient dehumidification can be performed only by the evaporation module 44. The second preset humidity is the maximum humidity up to the upper limit of the dehumidifying capacity of the evaporation module 44, and the preset humidity difference is the maximum humidity difference up to the upper limit of the processing capacity of the evaporation module 44.
The auxiliary dehumidifying system 60 comprises a spray evaporating module 61 and a moisture absorbing module 63, wherein the spray evaporating module 61 exchanges heat with the air circulating system 20 by spraying cooling water, and the moisture absorbing module 63 is used for absorbing water vapor generated in the heat exchanging process of the spray evaporating module 61.
Specifically, when the auxiliary dehumidifying system 60 is in the on state, the spray evaporation module 61 may spray cooling water to the outside of the air circulation duct 21, the cooling water exchanges heat with the high-temperature and high-humidity air in the air circulation duct 21, the cooling water absorbs the heat of the air and evaporates to form water vapor, which is absorbed by the moisture absorption module 63, and part of the water vapor in the high-temperature and high-humidity air in the air circulation duct 21 releases heat to form condensed water to be discharged. The air after the humidity is reduced by the auxiliary dehumidification system 60 through the above process and the evaporation module 44 of the main dehumidification system 40 continue to exchange heat to further cool and dehumidify, and finally become low-temperature and low-humidity air. While the auxiliary dehumidifying system 60 is in the off state, the spray evaporating module 61 stops spraying the cooling water, thereby stopping the heat exchange with the air in the air circulation duct 21.
In some embodiments, the moisture absorbent is a lithium bromide solution, which is a high-efficiency water vapor absorbent, and can absorb water vapor formed by evaporating cooling water of the spray evaporation module 61. It will be appreciated that the particular material of the moisture absorbent is not limited thereto and that in other embodiments the moisture absorbent may be made of other materials.
Further, since the moisture absorbing agent is diluted continuously in its own solution concentration during the process of absorbing moisture to weaken the moisture absorbing ability, the moisture absorbing agent can exchange heat with the main dehumidification system 40 to ensure good moisture absorbing ability. Specifically, the water content of the lithium bromide solution gradually increases and gradually changes from a concentrated solution to a dilute solution during the process of absorbing water vapor. When entering the drying later stage, the heat of the condensation module 42 is surplus, the auxiliary dehumidification system 60 is in a closed state, the spraying evaporation module 61 stops spraying cooling water, the lithium bromide dilute solution exchanges heat with the condensation module 42, the heat is absorbed in the lithium bromide dilute solution, the water absorbs heat and evaporates and volatilizes to the external environment, and the lithium bromide solution is changed into a concentrated solution again, so that the auxiliary dehumidification operation of the next period can be performed.
In some embodiments, the auxiliary dehumidifying system 60 includes a heat exchange tube 65 provided with a water pump 652, wherein the water pump 652 can pump the lithium bromide dilute solution into the heat exchange tube 65, and the lithium bromide dilute solution exchanges heat with the condensing module 43 in the heat exchange tube 65 and evaporates to form a concentrated solution, and then returns to the moisture absorbing module 63.
Further, the main dehumidification system 40 further comprises a condensate water storage structure 45 for storing condensate water generated by the main dehumidification system 40, the spray evaporation module 61 comprises a water storage unit 614 and a spray evaporation unit 612, and the condensate water storage structure 45, the water storage unit 614 and the spray evaporation module 61 are sequentially communicated through pipelines. Specifically, the condensed water generated by the evaporation module 44 during operation may enter the condensed water storage structure 45, then enter the water storage unit 614, and then enter the spray evaporation module 61 to be sprayed out through the spray evaporation module 61. In some embodiments, spray evaporation unit 612 is connected to an external water source by a pipe. When the condensed water in the condensed water storage structure 45 is less than the preset water amount at the initial stage of drying, the spray evaporation unit 612 may obtain a water source from the outside. In this way, the spray evaporation module 61 can recycle the condensed water in the condensed water storage structure 45, thereby reducing the frequency of cleaning the condensed water storage structure 45 by a user. In some embodiments, the water consumption of the spray evaporation module 61 and the frequency of extracting the condensed water in the condensed water storage structure 45 can be controlled to achieve the balance of supply and demand, so that the condensed water storage structure 45 does not need to be cleaned and an external drainage device is not needed for drainage.
The operation method of the drying apparatus 100 includes the steps of:
s110: a first humidity of the air in the air circulation system 20 is obtained before it is dehumidified by the main dehumidification system 40.
Specifically, the humidity of the air in the air circulation duct 21 before flowing through the evaporation module 44 (i.e., after the air flows through the drying unit 25) is obtained as the first humidity, and the air having the first humidity carries the moisture of the dried object in the drying unit 25.
S120: comparing the first humidity with a first preset humidity;
wherein, when the first humidity is greater than or equal to the first preset humidity, the auxiliary dehumidifying system 60 is turned on and dehumidifies in cooperation with the main dehumidifying system 40. When the first humidity is less than the third preset humidity, the auxiliary dehumidifying system 60 is in the off state.
Specifically, in the early stage of drying, the moisture content of the object to be dried in the drying unit 25 is relatively high, so that the first humidity of the air before being dehumidified by the evaporation module 44 is greater than or equal to the first preset humidity, and the humidity of the air exceeds the dehumidification capacity of the evaporation module 44, so that the auxiliary dehumidification system 60 is in an on state to perform pretreatment on the air, thereby reducing the humidity of the air flowing through the evaporation module 44. In this way, the high-temperature and high-humidity air carrying the moisture of the dried object in the air circulation system 20 forms low-temperature and low-humidity air through the secondary dehumidification cooling treatment of the auxiliary dehumidification system 60 and the main dehumidification system 40, so that the dried object can be continuously dried, the drying efficiency is good, the drying time is shortened, and the loss to clothes is reduced.
In the latter drying stage, the moisture content of the dried object in the drying unit 25 is low, so that the first humidity of the air flowing through the drying unit 25 and entering the air circulation duct 21 is less than the third humidity, and the dehumidifying capability of the evaporating module 44 can completely meet the dehumidifying requirement. At this time, the auxiliary dehumidifying system 60 is turned off to save energy, and the air can be dehumidified effectively only by the evaporating module 44. In this way, only the main dehumidification system 40 is used to exchange heat with the air of the air circulation system 20, so that the problem that the refrigerating capacity of the main dehumidification system 40 cannot be fully utilized is avoided, the operation load of the drying equipment 100 is reduced, the energy consumption of the drying equipment 100 is reduced, and the drying uniformity is improved.
In some embodiments, the method of operating the drying apparatus further comprises the steps of:
s130: the humidity difference of the air in the air circulation system 20 before and after the dehumidification 40 by the main dehumidification system is obtained.
Specifically, the humidity difference of the air in the air circulation duct 21 before and after dehumidification by the evaporation module 44 is obtained.
S140: comparing the humidity difference with a preset humidity difference;
when the first humidity is greater than or equal to the second preset humidity and the humidity difference is less than the preset humidity difference, the auxiliary dehumidification system 60 is in an on state. When the first humidity is less than the third preset humidity and/or the humidity difference is greater than or equal to the preset humidity difference, the auxiliary dehumidification system 60 is in an off state.
Specifically, at the initial stage of drying, the moisture content of the object to be dried in the drying unit 25 is high, so that the first humidity of the air flowing through the drying unit 25 into the air circulation duct 21 is greater than the second preset humidity, and the front-rear humidity difference of the air flowing through the evaporation module 44 is smaller than the preset humidity difference due to insufficient dehumidification capability of the evaporation module 44 of the main dehumidification system 40. At this time, the auxiliary dehumidifying system 60 is in an on state to pre-process the high-temperature and high-humidity air to primarily reduce the humidity of the air, thereby effectively reducing the pressure of the evaporation module 44 of the main dehumidifying system 40.
In the latter stage of drying, the moisture content of the dried object in the drying unit 25 is low, so that the first humidity of the air flowing through the drying unit 25 into the air circulation duct 21 is low, the dehumidification capability of the evaporation module 44 can fully meet the dehumidification requirement, so that the first humidity of the air flowing through the evaporation module 44 into the air circulation duct 21 is less than the third humidity, and/or the front-to-back humidity difference of the air flowing through the evaporation module 44 is greater than the preset humidity difference. At this time, the auxiliary dehumidifying system 60 is turned off to save energy, and the air can be dehumidified effectively only by the evaporating module 44.
In some embodiments, the operation method of the drying apparatus 100 further includes the following steps:
s100: the water quantity in the spray evaporation module 61 of the auxiliary dehumidification system 60 is detected, and when the water quantity in the spray evaporation module 61 is larger than the preset water quantity, the auxiliary dehumidification system 60 is in an openable state.
Specifically, before the auxiliary dehumidification system 60 works, the water amount in the water storage unit 614 in the spray evaporation module 61 is detected, and when the water amount in the water storage unit 614 is larger than the preset water amount, the spray evaporation unit 612 can work normally to spray enough cooling water to exchange heat with the high-temperature and high-humidity air in the air circulation pipeline 21. In some embodiments, the spray evaporation unit 612 may obtain water from an external source when the amount of water in the water storage unit 614 is less than a preset amount of water.
In some embodiments, the operation method of the drying apparatus 100 further includes the steps of:
s150: detecting dryness of the dried object in the air circulation system 20;
when the dryness of the dried object in the air circulation system 20 is greater than the preset dryness, the moisture absorption module 63 can exchange heat with the main dehumidification system 40.
Specifically, a detecting element for measuring dryness is installed in the drying unit 25, and the detecting element includes two metal sheets between which a voltage of 5V is applied. When the dried object is dried in the drying unit 25, the dried object is continuously contacted with the two metal sheets, and the voltage value between the two metal sheets is changed between 0V and 5V due to the different conductivities of the dried object with different dryness, so that the real-time drying condition of the dried object can be judged according to the magnitude of the real-time voltage value, and the working state of the auxiliary dehumidification system 60 is further controlled.
The above drying apparatus 100 may perform dryness detection on the drying unit 25 and humidity detection on the air in the air circulation duct 21, so as to adjust the air supply flow of the air circulation duct 21, the rotation speed and the rotation direction of the drying unit 25, the operation state of the main dehumidification system 40 (for example, the power of the compressor 41), the operation state of the auxiliary dehumidification system 60 (for example, opening, closing and exchanging heat with the main dehumidification system 40) according to the detection result, thereby achieving higher drying efficiency, better drying efficiency and lower energy consumption, and improving the comprehensive performance of the drying apparatus 100.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (12)
1. A drying apparatus (100), characterized in that the drying apparatus (100) comprises an air circulation system (20), a main dehumidification system (40) and an auxiliary dehumidification system (60), the main dehumidification system (40) and the auxiliary dehumidification system (60) being respectively heat exchangeable with the air circulation system (20);
the auxiliary dehumidification system (60) is provided with an opening state matched with the main dehumidification system (40) for dehumidification and a closing state for stopping dehumidification, the auxiliary dehumidification system (60) comprises a spray evaporation module (61) and a moisture absorption module (63), the moisture absorption module (63) comprises a moisture absorbent, when the auxiliary dehumidification system (60) is in the opening state, the spray evaporation module (61) exchanges heat with the air circulation system (20) through spray cooling water, the moisture absorbent is used for absorbing water vapor generated by the spray evaporation module (61) in the heat exchange process, and when the auxiliary dehumidification system (60) is in the closing state, the moisture absorbent can exchange heat with the main dehumidification system (40) to improve concentration.
2. The drying apparatus (100) according to claim 1, wherein the auxiliary dehumidification system (60) is in the on state when a first humidity of air in the air circulation system (20) before being dehumidified by the main dehumidification system (40) is greater than or equal to a first preset humidity.
3. The drying apparatus (100) according to claim 1, wherein the auxiliary dehumidifying system (60) is in the on state when a first humidity of air in the air circulation system (20) before being dehumidified by the main dehumidifying system (40) is greater than or equal to a second preset humidity and a humidity difference of air in the air circulation system (20) before being dehumidified by the main dehumidifying system (40) is less than a preset humidity difference.
4. The drying apparatus (100) according to claim 1, wherein the auxiliary dehumidifying system (60) is in the off state when the first humidity of the air in the air circulation system (20) before being dehumidified by the main dehumidifying system (40) is less than a third preset humidity and/or the humidity difference of the air in the air circulation system (20) before and after being dehumidified by the main dehumidifying system (40) is greater than or equal to a preset humidity difference.
5. The drying apparatus (100) of claim 1, wherein the hygroscopic agent is a lithium bromide solution.
6. The drying apparatus (100) according to claim 1, wherein the main dehumidification system (40) includes a condensate storage structure (45) for storing condensate, the condensate storage structure (45) being in communication with the spray evaporation module (61) through a conduit to deliver condensate to the spray evaporation module (61).
7. The drying apparatus (100) of claim 6, wherein the spray evaporation module (61) comprises a spray evaporation unit (612) and a water storage unit (614) connected to the condensate storage structure (45) by a pipe, the condensate storage structure (45) being connected to the water storage unit (614) and an external water source by a pipe.
8. A method of operating a drying appliance (100) for a drying appliance (100) according to any one of claims 1 to 7, characterized in that it comprises the steps of:
acquiring a first humidity of air in the air circulation system (20) before the air is dehumidified by the main dehumidification system (40);
comparing the first humidity with a first preset humidity;
wherein, when the first humidity is greater than or equal to the first preset humidity, the auxiliary dehumidification system (60) is started and is matched with the main dehumidification system (40) for dehumidification.
9. The method of operating a drying appliance (100) according to claim 8, wherein the method of operating a drying appliance (100) further comprises the steps of:
acquiring a humidity difference of air in the air circulation system (20) before and after dehumidification by the main dehumidification system (40);
comparing the humidity difference with a preset humidity difference;
when the first humidity is greater than or equal to a second preset humidity and the humidity difference is smaller than the preset humidity difference, the auxiliary dehumidification system (60) is started and is matched with the main dehumidification system (40) for dehumidification.
10. The method of operating a drying appliance (100) according to claim 9, wherein the method of operating a drying appliance (100) further comprises the steps of:
acquiring a humidity difference of air in the air circulation system (20) before and after dehumidification by the main dehumidification system (40);
comparing the humidity difference with a preset humidity difference;
wherein the auxiliary dehumidification system (60) is in the closed state when the first humidity is less than a third preset humidity and/or the humidity difference is greater than or equal to a preset humidity difference.
11. The method of operating a drying appliance (100) according to claim 8, wherein the method of operating a drying appliance (100) further comprises the steps of:
detecting dryness of the dried object in the air circulation system (20);
when the dryness of the dried object in the air circulation system (20) is larger than the preset dryness, the hygroscopic module (63) of the auxiliary dehumidifying system (60) can exchange heat with the main dehumidifying system (40).
12. The method of operating a drying appliance (100) according to claim 8, wherein the method of operating a drying appliance (100) further comprises the steps of:
and detecting the water quantity in a spray evaporation module (61) of the auxiliary dehumidification system (60), wherein the auxiliary dehumidification system (60) is in an openable state when the water quantity in the spray evaporation module (61) is larger than a preset water quantity.
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