CN109387075A - Heat pump system and heat pump drying device - Google Patents
Heat pump system and heat pump drying device Download PDFInfo
- Publication number
- CN109387075A CN109387075A CN201811151033.0A CN201811151033A CN109387075A CN 109387075 A CN109387075 A CN 109387075A CN 201811151033 A CN201811151033 A CN 201811151033A CN 109387075 A CN109387075 A CN 109387075A
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- Prior art keywords
- heat
- regenerative
- heat pump
- regenerative apparatus
- pump system
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
Abstract
The present invention provides a kind of heat pump system and heat pump drying device.The heat pump system includes blower (1), refrigerant circulation circuit and regenerative circuit, refrigerant circulation circuit includes compressor (2), evaporator (3), condenser (4) and first throttling device (5), regenerative circuit includes regenerative apparatus, regenerative apparatus is used to absorb the heat of compressor (2) and/or blower (1), refrigerant flows through regenerative circuit, and the heat transmission that regenerative apparatus is absorbed is to refrigerant circulation circuit.Heat pump system according to the present invention can effectively solve the problem that and heat deficiency when drying unit is run under startup stage, low ambient temperature, the problem of frosting influences heat exchange occurs in evaporator.
Description
Technical field
The invention belongs to drying equipment technologies, and in particular to a kind of heat pump system and heat pump drying device.
Background technique
The air circulation of existing heat pump driers most at present approximately as: after the condenser heating in heat pump system
Air by blower be sent into cloth drying room in, with wet load carry out hot and humid area after Hot wet air heating be sucked back at evaporator
Cool-down dehumidification is carried out, the air after dehumidifying is heated by condenser again and is sent into hothouse, and circulation reaches dehumidifying repeatedly
Drying effect.
The heat pump system of existing heat pump drying device is simple by compressor, condenser, throttling set, evaporator mostly
Be sequentially connected composition.Drying unit with this heat pump system is most simply most basic, although simply easily realization,
There is significant limitations, the heating drying and refrigerated dehumidification performance of heat pump drying device and its device cannot be played well, transports
The amount of heat that compressor and blower generate during row is discharged into external environment air, is wasted this partial heat and is also caused environment
Thermal pollution, and when drying unit is run under startup stage, low ambient temperature, need high power consumption operation to can be only achieved for a long time
Need state parameter is dried, evaporator is also easy to frosting and freezes influence heat exchange.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is that providing a kind of heat pump system and heat pump drying device, Neng Gouyou
Effect solves heating deficiency when drying unit is run under startup stage, low ambient temperature, and frosting, which occurs, in evaporator influences heat exchange
Problem.
To solve the above-mentioned problems, the present invention provides a kind of heat pump system, including blower, refrigerant circulation circuit and accumulation of heat are returned
Road, refrigerant circulation circuit include compressor, evaporator, condenser and first throttling device, and regenerative circuit includes regenerative apparatus, are stored
Thermal is used to absorb the heat of compressor and/or blower, and refrigerant flows through regenerative circuit, and the heat that regenerative apparatus is absorbed passes
Transport to refrigerant circulation circuit.
Preferably, regenerative apparatus includes the first regenerative apparatus and the second regenerative apparatus, and the first regenerative apparatus is for absorbing pressure
The heat of contracting machine, the second regenerative apparatus are used to absorb the heat of blower.
Preferably, one end of regenerative circuit is connected to the outlet end of condenser, and the other end is connected to the suction end of compressor.
Preferably, one end of regenerative circuit is connected to the outlet end of evaporator, and the other end is connected to the suction end of compressor.
Preferably, it is provided with the first control valve in regenerative circuit, is arranged in the refrigerant circulation circuit in parallel with regenerative circuit
There is the second control valve.
Preferably, the first regenerative apparatus and the second regenerative apparatus are in parallel.
Preferably, second throttling device, the second regenerative apparatus institute are provided in the regenerative circuit where the first regenerative apparatus
Regenerative circuit on be provided with third throttling set.
Preferably, the first regenerative apparatus and the series connection of the second regenerative apparatus.
Preferably, second throttling device is provided in regenerative circuit.
Preferably, the suction end of compressor is provided with gas-liquid separator.
Preferably, regenerative apparatus includes shell, is arranged in the intracorporal heat exchange coil of shell and is filled in heat exchange coil and shell
Heat-storing material between body.
According to another aspect of the present invention, a kind of heat pump drying device is provided, including hothouse, circulation air path and above-mentioned
Heat pump system, the evaporator and condenser of heat pump system be successively set in circulation air path along air current flow direction.
Heat pump system provided by the invention, including blower, refrigerant circulation circuit and regenerative circuit, refrigerant circulation circuit include
Compressor, evaporator, condenser and first throttling device, regenerative circuit include regenerative apparatus, and regenerative apparatus is for absorbing compression
The heat of machine and/or blower, refrigerant flow through regenerative circuit, and the heat transmission that regenerative apparatus is absorbed is to refrigerant circulation circuit.
The heat pump system can recycle the heat of compressor and/or blower, energy-saving and environment-friendly, can also be using these heats to refrigerant
It is heated, to reduce the heat absorbed needed for evaporator, is made under effective solution system rigid startup stage and low ambient temperature
Hot insufficient, frosting, which occurs, in evaporator influences heat exchange, is warming up to that target component state for time is long, and time-consuming for whole drying course, energy
Consume high problem, moreover it is possible to play heat spreading function to compressor, blower using refrigerant.
Detailed description of the invention
Fig. 1 is the structure principle chart of the heat pump system of first embodiment of the invention；
Fig. 2 is the structure principle chart of the heat pump system of second embodiment of the invention；
Fig. 3 is the structure principle chart of the heat pump system of third embodiment of the invention.
Appended drawing reference indicates are as follows:
1, blower；2, compressor；3, evaporator；4, condenser；5, first throttling device；6, the first regenerative apparatus；7,
Two regenerative apparatus；8, the first control valve；9, the second control valve；10, second throttling device；11, third throttling set；12, gas-liquid
Separator；13, hothouse；14, circulation air path.
Specific embodiment
In conjunction with referring to shown in Fig. 1 to Fig. 3, according to an embodiment of the invention, heat pump system includes that blower 1, refrigerant circulation return
Road and regenerative circuit, refrigerant circulation circuit include compressor 2, evaporator 3, condenser 4 and first throttling device 5, regenerative circuit
Including regenerative apparatus, regenerative apparatus is used to absorb the heat of compressor 2 and/or blower 1, and refrigerant flows through regenerative circuit, and will store
The heat transmission that thermal absorbs is to refrigerant circulation circuit.
The heat pump system can recycle the heat of compressor 2 and/or blower 1, energy-saving and environment-friendly, can also utilize these
Heat heats refrigerant, so that the heat absorbed needed for reducing evaporator, effectively solves system rigid startup stage and low ring
Heat insufficient at a temperature of border, frosting, which occurs, in evaporator influences heat exchange, and it is long to be warming up to target component state for time, whole drying course
The problem that time-consuming, energy consumption is high, moreover it is possible to play heat spreading function to compressor 2, blower 1 using refrigerant.
Heat pump system, which can be set up, sets one for absorbing the regenerative apparatus of 2 heat of compressor, can also set up and set one
For absorbing the regenerative apparatus of 1 heat of blower, regenerative apparatus can also be set outside compressor 2 and blower 1 respectively, absorb simultaneously
The heat of compressor 2 and blower 1.
In the present embodiment, regenerative apparatus includes the first regenerative apparatus 6 and the second regenerative apparatus 7, and the first regenerative apparatus 6 is used
In the heat for absorbing compressor 2, the second regenerative apparatus 7 is used to absorb the heat of blower 1.By the way that two regenerative apparatus, energy is arranged
Enough heats for absorbing compressor 2 and blower 1 respectively, and refrigerant is heated using the heat absorbed, improve heat
Utilization efficiency reduces energy waste, and solving the problems, such as whole drying course, time-consuming, energy consumption is high, moreover it is possible to while utilizing cold
Matchmaker plays heat spreading function to compressor 2, blower 1.
One end of regenerative circuit is connected to the outlet end of condenser 4, and the other end is connected to the suction end of compressor 2.Refrigerant
After exchanging heat in condenser 4, a part flows through the suction end that compressor 2 is flowed back to after evaporator 3 evaporates, and another part flows through storage
After thermal and the heat exchange of the first regenerative apparatus 6 and the second regenerative apparatus 7, the suction end of compressor 2 is flowed back to, the first accumulation of heat is flowed through
The refrigerant of device 6 and the second regenerative apparatus 7 absorbs the heat of regenerative apparatus, can be improved the refrigerant temperature being back in compressor
Degree reduces the heat demand of evaporator 3, when so that heat pump system being run at low ambient temperatures, system heating capacity can be improved,
Drying unit is enabled to be rapidly achieved drying temperature requirement, operational efficiency and stability are higher, avoid evaporator evaporating temperature
It is too low and lead to frosting, influence the heat exchange property and system stability of drying unit.
In conjunction with shown in Figure 1, first embodiment according to the present invention, the first regenerative apparatus 6 and the second regenerative apparatus 7 are simultaneously
Connection.In the present embodiment, refrigerant into regenerative circuit, and is divided into two after the outflow of the outlet end of condenser 4 in regenerative circuit
Road flows through the first regenerative apparatus 6 all the way and exchanges heat, and another way flows through the second regenerative apparatus 7 and exchanges heat, later two-way refrigerant
It crosses, and is connected to the air return end of compressor 2.
Due to two-way refrigerant parallel fluid flow, can more fully exchange heat with two regenerative apparatus, Ke Yijin
One step improves the heat exchange efficiency between refrigerant and regenerative apparatus, improves energy utilization rate.
Preferably, second throttling device 10, the second regenerative apparatus are provided in the regenerative circuit where the first regenerative apparatus 6
Third throttling set 11 is provided in regenerative circuit where 7.Refrigerant first passes around the before entering the first regenerative apparatus 6
Two throttling sets 10 throttle, to can more fully absorb the first regenerative apparatus when reaching the first regenerative apparatus 6
Heat in 6, absorption heat is bigger, and heat utilization is more abundant, can also further increase refrigerant and imitate to the cooling of compressor 2
Fruit.Similarly, refrigerant first passes around third throttling set 11 and throttles, thus arriving before entering the second regenerative apparatus 7
When up to the second regenerative apparatus 7, the heat in the second regenerative apparatus 7 can be more fully absorbed, it is bigger to absorb heat, heat benefit
With more sufficiently, refrigerant can also be further increased to the cooling effect of blower 1.
In conjunction with shown in Figure 2, second embodiment according to the present invention, the first regenerative apparatus 6 and the second regenerative apparatus 7 string
Connection.In the present embodiment, along refrigerant flow direction, the second regenerative apparatus 7 is arranged in 6 upstream of the first regenerative apparatus, is carrying out
When heat exchange, refrigerant can first flow through the second regenerative apparatus 7, then flow through the first regenerative apparatus 6, since in contrast, blower 1 dissipates
The heat of hair can be less than the heat that compressor 2 distributes, therefore, so that refrigerant absorbs the heat that blower 1 distributes first and carries out, later
The heat that compressor 2 distributes is reabsorbed, enables to refrigerant after by the second regenerative apparatus 7, temperature rising is lower, therefore
The heat in the first regenerative apparatus 6 can be more fully absorbed, structure design is more reasonable, and heat utilization is more abundant.
Preferably, it is provided with second throttling device 10 in regenerative circuit, 6 He of the first regenerative apparatus can entered in refrigerant
It before second regenerative apparatus 7, first passes around second throttling device 10 and throttles, thus reaching the first regenerative apparatus 6 and the
When two regenerative apparatus 7, the heat in the first regenerative apparatus 6 and the second regenerative apparatus 7 can be more fully absorbed, absorbs heat
Bigger, heat utilization is more abundant, can also further increase refrigerant to the cooling effect of blower 1 and compressor 2.
It is essentially identical with second embodiment in conjunction with shown in Figure 3, third embodiment according to the present invention, difference
It is in in the present embodiment, one end of regenerative circuit is connected to the outlet end of evaporator 3, and the other end is connected to compressor 2
Suction end.In the present embodiment, refrigerant is divided into two-way after the outflow of evaporator 3, wherein all the way directly through refrigerant circulation circuit stream
The suction end of compressor 2 is returned, the other end flows back to compressor 2 after flowing through the first regenerative apparatus 6 and the heat exchange of the second regenerative apparatus 7
Suction end.
Preferably, it is provided with the first control valve 8 in regenerative circuit, is arranged in the refrigerant circulation circuit in parallel with regenerative circuit
There is the second control valve 9.First control valve 8 and the second control valve 9 are solenoid valve.First control valve 8 can control regenerative circuit
Opening and closing and cold medium flux size, the second control valve 9 can control the opening and closing and cold medium flux size of refrigerant circulation circuit,
By the first control valve 8 of setting and the second control valve 9, the refrigerant that can be conveniently adjusted in regenerative circuit and refrigerant circulation circuit
Flow more efficiently improves drying unit in startup stage low temperature so that refrigerant temperature, which is adjusted, preferably meets drying needs
Drying performance under environment.
Preferably, the suction end of compressor 2 is provided with gas-liquid separator 12, and refrigerant enters gas after flowing through regenerative apparatus
Liquid/gas separator 12 carries out gas-liquid separation, enters in compressor 2 to be effectively prevented from liquid refrigerants and liquid hit phenomenon occurs.
In the present embodiment, regenerative apparatus includes shell, is arranged in the intracorporal heat exchange coil of shell and is filled in heat exchange plate
Heat-storing material between pipe and shell.The heat that compressor 2 and 1 operational process of blower generate is by the storage of its outer surface package arrangement
Heat-storing material in thermal absorbs, and heat-storing material imparts heat to the refrigerant in coil pipe again, and refrigerant absorption is taken away heat and returned to
Compressor 2 continues cycling through, and heat may also be stored in and take away utilization by refrigerant again when regenerative apparatus is medium to be needed, and is finally reached storage
Recuperation of heat utilizes purpose.
According to an embodiment of the invention, heat pump drying device includes hothouse 13, circulation air path 14 and above-mentioned heat pump system
System, the evaporator 3 and condenser 4 of heat pump system are successively set in circulation air path 14 along air current flow direction.
The course of work of heat pump drying device is as follows:
Under the driving of blower 1, damp-heat air is ejected from 13 air outlet of hothouse, first passes through evaporator 3 damp and hot sky
Air cooling is precipitated condensed water at cold dry air and realizes that cool-down dehumidification, condensed water drop down onto the water pan device of two device bottoms, by weight
Power effect is discharged by condensate pipe, and then cold dry air becomes heated dry air by the heating of condenser 4, by blower 1 from drying
13 air inlet of room blows to interior, takes away the moisture in wet load with wet load contact mass-and heat-transfer and forms damp-heat air, passes through wind
The suction of machine 1 is again from the air outlet outflow being connected with hothouse 13, and through 3 cool-down dehumidification of evaporator, circulation, which reaches, repeatedly is removed
Wet drying purpose.
In the process, the course of work of heat pump system is as follows:
In conjunction with shown in Figure 1, the high temperature and pressure refrigerant that compressor 2 comes out is divided into two flow paths after 4 heat release of condenser,
It is all the way refrigerant circulation circuit, eventually passes back to compressor 2 to 3 refrigerated dehumidification of evaporator after 5 reducing pressure by regulating flow of first throttling device,
Another way is regenerative circuit, and refrigerant after second throttling device 10,11 reducing pressure by regulating flow of third throttling set, flows to respectively respectively
One regenerative apparatus 6 and the second regenerative apparatus 7 return to compressor 2 after absorbing heat, collectively constitute with refrigerant circulation circuit and completely follow
Loop back path.Wherein second throttling device 10, third throttling set 11 can need to be opened and closed regenerative circuit or be changed according to system and be stored
Cold medium flux in hot loop.
In conjunction with shown in Figure 2, essentially identical with mode 1, refrigerant circulation circuit is the same, only setting second in regenerative circuit
Throttling set 10, the refrigerant after reducing pressure by regulating flow, which flows through the heat absorption of the second regenerative apparatus 7 and followed by flows to the first regenerative apparatus 6, to have absorbed heat
Compressor 2 is flowed to after.Second throttling device 10 plays effect identical with mode 1.
In conjunction with shown in Figure 3, unlike mode 1,2, refrigerant is after 3 evaporation endothermic refrigerated dehumidification of evaporator in low
Warm low-pressure state, it is refrigerant circulation circuit that outflow rear portion, which returns to compressor 2, and another part is regenerative circuit, successively second
Compressor 2 is returned to after heat absorption in regenerative apparatus 7 and the first regenerative apparatus 6.First control valve 8 and the second control valve 9 controllably freeze
The opening and closing and cold medium flux size of matchmaker's circulation loop and regenerative circuit.
Those skilled in the art will readily recognize that above-mentioned each advantageous manner can be free under the premise of not conflicting
Ground combination, superposition.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.Above only
It is the preferred embodiment of the present invention, it is noted that for those skilled in the art, do not departing from this hair
Under the premise of bright technical principle, several improvements and modifications can also be made, these improvements and modifications also should be regarded as guarantor of the invention
Protect range.
Claims (12)
1. a kind of heat pump system, which is characterized in that including blower (1), refrigerant circulation circuit and regenerative circuit, the refrigerant circulation
Circuit includes compressor (2), evaporator (3), condenser (4) and first throttling device (5), and the regenerative circuit includes accumulation of heat dress
It sets, the regenerative apparatus is used to absorb the heat of the compressor (2) and/or the blower (1), and refrigerant flows through the accumulation of heat and returns
Road, and the heat transmission that the regenerative apparatus is absorbed is to the refrigerant circulation circuit.
2. heat pump system according to claim 1, which is characterized in that the regenerative apparatus includes the first regenerative apparatus (6)
With the second regenerative apparatus (7), first regenerative apparatus (6) is used to absorb the heat of the compressor (2), second accumulation of heat
Device (7) is used to absorb the heat of the blower (1).
3. heat pump system according to claim 2, which is characterized in that one end of the regenerative circuit is connected to the condensation
The outlet end of device (4), the other end are connected to the suction end of the compressor (2).
4. heat pump system according to claim 2, which is characterized in that one end of the regenerative circuit is connected to the evaporation
The outlet end of device (3), the other end are connected to the suction end of the compressor (2).
5. heat pump system according to claim 4, which is characterized in that be provided with the first control valve in the regenerative circuit
(8), the second control valve (9) are provided in the refrigerant circulation circuit in parallel with the regenerative circuit.
6. heat pump system according to any one of claim 3 to 5, which is characterized in that first regenerative apparatus (6) and
Second regenerative apparatus (7) is in parallel.
7. heat pump system according to claim 6, which is characterized in that the accumulation of heat where first regenerative apparatus (6) is returned
Road is provided with second throttling device (10), and third throttling is provided in the regenerative circuit where second regenerative apparatus (7)
Device (11).
8. heat pump system according to any one of claim 3 to 5, which is characterized in that first regenerative apparatus (6) and
Second regenerative apparatus (7) series connection.
9. heat pump system according to claim 8, which is characterized in that be provided with second throttling device in the regenerative circuit
(10)。
10. heat pump system according to any one of claim 1 to 5, which is characterized in that the air-breathing of the compressor (2)
End is provided with gas-liquid separator (12).
11. heat pump system according to any one of claim 1 to 5, which is characterized in that the regenerative apparatus includes shell
Body, the heat-storing material that the intracorporal heat exchange coil of shell is set and is filled between the heat exchange coil and the shell.
12. a kind of heat pump drying device, which is characterized in that including hothouse (13), circulation air path (14) and claim 1 to 11
Any one of described in heat pump system, the evaporator (3) and condenser (4) of the heat pump system along air current flow direction successively
Setting is in the circulation air path (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811151033.0A CN109387075A (en) | 2018-09-29 | 2018-09-29 | Heat pump system and heat pump drying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811151033.0A CN109387075A (en) | 2018-09-29 | 2018-09-29 | Heat pump system and heat pump drying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109387075A true CN109387075A (en) | 2019-02-26 |
Family
ID=65419099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811151033.0A Pending CN109387075A (en) | 2018-09-29 | 2018-09-29 | Heat pump system and heat pump drying device |
Country Status (1)
| Country | Link |
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| CN (1) | CN109387075A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111569344A (en) * | 2020-05-28 | 2020-08-25 | 青岛理工大学 | Circulating drying device, fire hose drying system and method |
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| JPH04236075A (en) * | 1991-01-18 | 1992-08-25 | Sharp Corp | Air-conditioning machine |
| CN103574798A (en) * | 2012-07-30 | 2014-02-12 | 珠海格力电器股份有限公司 | Heat-pump-type air conditioning system, sensible-heat defrosting method, heat-storage defrosting method |
| CN203550281U (en) * | 2013-09-30 | 2014-04-16 | 珠海格力电器股份有限公司 | Air conditioning system capable of achieving continuous heating |
| CN206274211U (en) * | 2016-10-31 | 2017-06-23 | 广东美的制冷设备有限公司 | Heat accumulating type air-source heat pump air conditioning system and the air-conditioning comprising it |
| CN206469597U (en) * | 2016-12-08 | 2017-09-05 | 广西田园生化股份有限公司 | A kind of drying plant |
-
2018
- 2018-09-29 CN CN201811151033.0A patent/CN109387075A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04236075A (en) * | 1991-01-18 | 1992-08-25 | Sharp Corp | Air-conditioning machine |
| CN103574798A (en) * | 2012-07-30 | 2014-02-12 | 珠海格力电器股份有限公司 | Heat-pump-type air conditioning system, sensible-heat defrosting method, heat-storage defrosting method |
| CN203550281U (en) * | 2013-09-30 | 2014-04-16 | 珠海格力电器股份有限公司 | Air conditioning system capable of achieving continuous heating |
| CN206274211U (en) * | 2016-10-31 | 2017-06-23 | 广东美的制冷设备有限公司 | Heat accumulating type air-source heat pump air conditioning system and the air-conditioning comprising it |
| CN206469597U (en) * | 2016-12-08 | 2017-09-05 | 广西田园生化股份有限公司 | A kind of drying plant |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111569344A (en) * | 2020-05-28 | 2020-08-25 | 青岛理工大学 | Circulating drying device, fire hose drying system and method |
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Application publication date: 20190226 |