CN117570566A - Heat recovery system of heating ventilation air conditioner - Google Patents
Heat recovery system of heating ventilation air conditioner Download PDFInfo
- Publication number
- CN117570566A CN117570566A CN202311807308.2A CN202311807308A CN117570566A CN 117570566 A CN117570566 A CN 117570566A CN 202311807308 A CN202311807308 A CN 202311807308A CN 117570566 A CN117570566 A CN 117570566A
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- Prior art keywords
- heat
- waste heat
- fixed
- heat recovery
- temperature control
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 54
- 238000011084 recovery Methods 0.000 title claims abstract description 50
- 238000009423 ventilation Methods 0.000 title claims abstract description 34
- 230000007246 mechanism Effects 0.000 claims abstract description 104
- 239000002918 waste heat Substances 0.000 claims abstract description 70
- 238000004321 preservation Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 210000001503 joint Anatomy 0.000 claims description 10
- 238000004378 air conditioning Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention discloses a heat recovery system of a heating ventilation air conditioner, which relates to the field of air conditioner waste heat recovery and comprises a bearing frame, wherein a heat preservation tank and a waste heat utilization device are fixed on the bearing frame, and the waste heat utilization device comprises a waste heat recovery mechanism and a waste heat distribution mechanism. When the method is used in the waste heat recovery and utilization process of the heating ventilation air conditioner, the waste heat distribution mechanism can actively adjust the heat distribution mode according to the heat dissipation capacity of the heating ventilation air conditioner, so that the waste heat recovery mechanism can more efficiently recover waste heat, and the utilization effect of other heat is improved.
Description
Technical Field
The invention relates to the field of air conditioner waste heat recovery, in particular to a heat recovery system of a heating ventilation air conditioner.
Background
When the heating ventilation air conditioner is used, heat needs to be released, and the heat needs to be discharged into the air, so that the heat is wasted, the atmosphere is warmed, however, the water source is mainly heated by directly utilizing waste heat at present, the water source is not regulated and controlled, and insufficient waste heat utilization and the waste heat water source cannot be accurately utilized for fine heating.
In order to solve the above problems, the present invention provides a heat recovery system of a hvac system.
Disclosure of Invention
In order to achieve the above purpose, the present invention provides the following technical solutions: a heat recovery system for a hvac comprising:
the bottom layer of the bearing frame is fixedly provided with a heat preservation tank; and
the waste heat utilization device is fixed on the two layers of the bearing frame and is connected with the heat preservation tank through a butt joint pipe, and the waste heat utilization device is also in butt joint with the heating ventilation air conditioner.
Further, preferably, the waste heat utilization device includes:
the bin body is fixed on the bearing frame, and a convection window is fixedly arranged at the top of the bin body;
the waste heat recovery mechanism is fixed in the bin body, one end of the waste heat recovery mechanism is provided with a water inlet valve, and the other end of the waste heat recovery mechanism is connected with the butt joint pipe; and
and one end of the waste heat distribution mechanism is connected to the waste heat recovery mechanism, and the other end of the waste heat distribution mechanism is connected with the heating ventilation air conditioner.
Further, preferably, the waste heat recovery mechanism includes:
the first temperature control mechanism and the second temperature control mechanism are symmetrically fixed in the bin body and are connected through an adjusting valve;
one end of the first heat flow pipe is connected with and communicated with a part of the temperature control mechanism, and the other end of the first heat flow pipe is connected with the waste heat distribution mechanism;
one end of the second heat flow pipe is connected with and communicated with the second temperature control mechanism, and the other end of the second heat flow pipe is connected with the waste heat distribution mechanism; and
one end of the water outlet valve is connected to the second temperature control mechanism, and the other end of the water outlet valve is connected to the second temperature control mechanism.
Further, preferably, the waste heat distribution mechanism mainly comprises a driving fan and a control valve, and a rotation speed sensor is further arranged on a main shaft of the driving fan, and the rotation speed sensor adjusts the opening and closing control of the control valve on the first heat flow pipe and the second heat flow pipe according to the rotation speed of the driving fan.
Further, preferably, the first temperature control mechanism and the second temperature control mechanism are similar in structure and each include:
the water storage tank is fixed in the bin body and is connected with the bin body through a pipeline;
the heat flow regulating mechanism is fixed on the water storage tank;
the heat flow connecting shell is fixed on the heat flow regulating mechanism and is communicated with the heat flow regulating mechanism by arranging a convection tube; and
one end of the heat conduction pipe is fixed on the first heat flow pipe, and the other end of the heat conduction pipe is fixed on the heat flow connecting shell.
Further, preferably, the heat flow adjustment mechanism includes:
the plurality of brackets are arranged and uniformly fixed on the surface of the water storage tank around the circumference, and slide ways are arranged on the brackets;
the shell is fixed on the bracket, and a plurality of mounting grooves are indirectly formed in the shell;
the sliding block is arranged in the slideway in a sliding way,
the two telescopic rods are symmetrically arranged by taking the bracket as a central axis, the fixed ends are rotatably arranged in the mounting groove, and the sliding ends are rotatably arranged on the sliding blocks; and
the first arc-shaped plate and the second arc-shaped plate are respectively fixed at the sliding ends of the telescopic rods.
Further, preferably, the first arc plate and the second arc plate are both provided with magnets on the contact surfaces thereof, and the first arc plate is located above the second arc plate on the contact surfaces thereof, and a space formed by the first arc plate, the second arc plate and the water storage tank is a heating space.
Compared with the prior art, the invention provides a heat recovery system of a heating ventilation air conditioner, which has the following beneficial effects:
the waste heat distribution mechanism can distribute the waste heat generated by the heating ventilation air conditioner in different modes, so that the utilization efficiency of the waste heat recovery mechanism on the waste heat is remarkably improved, and the heated water source can be maintained at the basic use temperature for a long time.
The heat flow regulating mechanism can passively regulate the size of the heating space according to the heat value (wind speed) of the heat source, so that the recycling effect of the waste heat is further improved.
Drawings
FIG. 1 is a schematic view of a heat recovery system of a hvac system;
FIG. 2 is a block diagram of a heat recovery system waste heat utilization device of a heating ventilation air conditioner;
FIG. 3 is a diagram of a heat recovery mechanism of a heat recovery system of a heating ventilation air conditioner;
FIG. 4 is a diagram of a temperature control mechanism of a heat recovery system of a heating ventilation air conditioner;
fig. 5 is a structural diagram of a heat flow regulating mechanism of a heat recovery system of a heating ventilation air conditioner.
In the figure: 1. a carrier; 2. a heat preservation tank; 3. a waste heat utilization device; 31. a bin body; 33. a waste heat distribution mechanism; 34. a convection window; 36. a water inlet valve; 4. a waste heat recovery mechanism; 41. a first temperature control mechanism; 411. a water storage tank; 412. a heat flow regulating mechanism; 4121. a bracket; 4122. a housing; 4123. a telescopic rod; 4124. a slide block; 4125. an arc-shaped plate I; 4126. arc-shaped plate II; 413. a heat flow connection housing; 414. a convection tube; 415. a first thermal flow tube; 42. a second temperature control mechanism; 43. a first thermal flow tube; 44. a second heat flow pipe; 45. a water outlet valve; 46. a regulating valve; 5. and (5) connecting the pipes.
Detailed Description
Referring to fig. 1 to 5, the present invention provides a technical solution: a heat recovery system for a hvac comprising:
the heat preservation tank comprises a bearing frame 1, wherein a heat preservation tank 2 is fixedly arranged at the bottom layer of the bearing frame 1; and
the waste heat utilization device 3 is fixed on two layers of the bearing frame 1 and is connected with the heat preservation tank 2 through the butt joint pipe 5, and the waste heat utilization device 3 is also in butt joint with a heating ventilation air conditioner.
As a preferred embodiment, the waste heat utilization device 3 includes:
the bin body 31 is fixed on the bearing frame 1, and a convection window 34 is fixedly arranged at the top of the bin body 31;
the waste heat recovery mechanism 4 is fixed in the bin body 31, one end of the waste heat recovery mechanism 4 is provided with a water inlet valve 36, and the other end of the waste heat recovery mechanism is connected with the butt joint pipe 5; and
and one end of the waste heat distribution mechanism 33 is connected to the waste heat recovery mechanism 4, and the other end is connected to the heating ventilation air conditioner.
When the hvac starts to operate, the hot air source is first introduced into the waste heat recovery mechanism 4 as required under the action of the waste heat distribution mechanism 33, and the waste heat recovery mechanism 4 heats water therein by the distributed hot air source, so as to recycle waste heat of the hvac.
As a preferred embodiment, the waste heat recovery mechanism 4 includes:
the first temperature control mechanism 41 and the second temperature control mechanism 42 are symmetrically fixed in the bin body 31, and the first temperature control mechanism 41 and the second temperature control mechanism 42 are connected through an adjusting valve 46;
a first heat flow pipe 43, one end of which is connected with and conducted with the first temperature control mechanism 41, and the other end of which is connected with the waste heat distribution mechanism 33;
a second heat flow pipe 44, one end of which is connected with and conducted with the second temperature control mechanism 42, and the other end of which is connected with the waste heat distribution mechanism 33; and
one end of the water outlet valve 45 is connected to the second temperature control mechanism 42, and the other end is connected to the second temperature control mechanism.
As a preferred embodiment, the waste heat distribution mechanism 33 mainly includes a driving fan and a control valve, and a rotation speed sensor is further disposed on a main shaft of the driving fan, and the rotation speed sensor adjusts the opening and closing control of the control valve on the first heat flow pipe 43 and the second heat flow pipe 44 according to the rotation speed of the driving fan.
It should be noted that, the heating ventilation air conditioner will generate different heating values when working under different environments and states, and the heat dissipation fan rotation speed will be different when the heating ventilation air conditioner dissipates heat under different heating values, that is, the greater the heat dissipation fan rotation speed will be (the greater the wind speed is) under the condition of the greater heating value.
When the heating ventilation air conditioner starts to start, the hot air source drives the driving fan to rotate, the rotation rate of the driving fan is detected through the rotation speed sensor, meanwhile, the rotation of the driving fan provides necessary electric quantity for the rotation speed sensor and the control valve, when the rotation speed sensor detects that the rotation speed is small (the heating of the heating ventilation air conditioner is small), the control valve enables the hot air source to only enter the first heat pipe 43, so that only the water source in the first heat control mechanism 41 is heated, meanwhile, the regulating valve 46 is closed, the condition that the water source in the first heat control mechanism 41 cannot meet the basic use condition is avoided, the water source in the first heat control mechanism 41 flows into the second heat control mechanism 42, meanwhile, if the temperature of the water source reaches the basic use condition when the temperature of the hot air source is small, the regulating valve 46 is opened, the water source flows into the second heat control mechanism 42, the residual temperature in the bin body 31 is utilized to improve the heat preservation and the hot water source is stored, when the first heat control mechanism 41 is completely discharged, and when the water source in the first heat control mechanism 41 reaches the basic use condition again, the waste heat generated by the heating ventilation air conditioner is prevented from being completely heated under the heating condition.
When the rotation speed sensor detects that the rotation speed is large (the heating of the heating ventilation air conditioner is large), the control valve is opened simultaneously, so that the hot air source enters the first temperature control mechanism 41 and the second temperature control mechanism 42, the heating value of the hot air source is higher because the overall heating of the heating ventilation air conditioner is large, the water source in the first temperature control mechanism 41 and the second temperature control mechanism 42 can be heated to a higher temperature, and the heated water source flows into the heat preservation tank 2 through the water outlet valve 45 under the action of the butt joint pipe 5 for heat preservation and storage, so that the water source temperature can be maintained in a basic use condition for a long time.
As a preferred embodiment, the first temperature control mechanism 41 and the second temperature control mechanism 42 are similar in structure, and each includes:
a water storage tank 411 fixed in the bin body 31 and connected thereto through a pipe;
a heat flow regulating mechanism 412 fixed to the water storage tank 411;
a heat flow connection housing 413 fixed to the heat flow adjustment mechanism 412 and connected to the heat flow adjustment mechanism 412 by a convection tube 414; and
a heat pipe 415 having one end fixed to the first heat pipe 43 and the other end fixed to the heat flow connection housing 413.
It should be noted that, when the hot air source flows into the heat flow connection housing 413 through the heat conduction tube 415, the convection tube 414 guides the heat source in the heat flow connection housing 413 into the heat flow adjustment mechanism 412, and at this time, the heat flow adjustment mechanism 412 can passively adjust the space between the heat flow adjustment mechanism 412 and the water storage tank 411 in real time according to the wind speed (the heat value of the side reaction heat source), so as to improve the full utilization of the heat value in the hot air source by the water storage tank 411 and improve the recovery efficiency of the waste heat of the heating ventilation air conditioner.
As a preferred embodiment, the heat flow adjustment mechanism 412 includes:
a plurality of brackets 4121 which are uniformly fixed on the surface of the water storage tank 411 around the circumference, and slide ways are arranged on the brackets 4121;
a housing 4122 fixed to the bracket 4121, wherein a plurality of mounting grooves are indirectly formed in the housing 4122;
a slider 4124 slidably disposed within the slideway,
the two telescopic rods 4123 are symmetrically arranged by taking the bracket 4121 as a central axis, the fixed ends are rotatably arranged in the mounting grooves, and the sliding ends are rotatably arranged on the sliding blocks 4124; and
the first arcuate plate 4125 and the second arcuate plate 4126 are respectively fixed to the sliding ends of the telescopic rod 4123.
In a preferred embodiment, the first arc plate 4125 and the second arc plate 4126 are provided with magnets on their contact surfaces, and the first arc plate 4125 will be located above the second arc plate 4126 on their contact surfaces, and the space formed by the first arc plate 4125, the second arc plate 4126 and the water storage tank 411 is a heating space.
It should be noted that, when the wind speed of the hot air source increases, the pressure in the heating space increases, and at this time, the increased pressure expands the heating space, so that the telescopic rod 4123 lifts under the limitation of the sliding block 4124 and the sliding way, and the telescopic rod 4123 lifts the arc plate one 4125 and the arc plate two 4126 at the same time, so that the heating space increases, so that more hot air sources can be stored in unit time, and the flow rate of the hot air sources in the heating space is reduced, so as to improve the recovery effect of the heat value; conversely, the reduction of the wind speed of the hot air source (small heat value) reduces the pressure of the heating space, the reduction of the heating space promotes the reduction of the storage of the hot air source in unit time, the flow rate of the hot air source is improved, and the heat recovery effect is improved while the heat of the water source is prevented from being taken away.
It should be explained that the arrangement of the magnet can make the first arc plate 4125 and the second arc plate 4126 always contact, so as to avoid the loss of the hot air source caused by separation in the moving process; the first arc plate 4125 is positioned above the second arc plate 4126, and can effectively avoid flowing out of the contact gap according to the flow direction of the hot air source.
In specific implementation, the waste heat distribution mechanism 33 distributes the hot air source generated by the heating ventilation and air conditioning into the waste heat recovery mechanism 4 according to different wind speeds, and the waste heat recovery mechanism 4 heats the water source according to the distribution state of the hot air source by adopting different heating modes, so that the recycling of the waste heat of the heating ventilation and air conditioning is improved, and the heated water source can be kept in a reasonable use temperature range for a long time.
The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. A heat recovery system of a heating ventilation air conditioner, which is characterized in that: comprising the following steps:
the heat preservation tank comprises a bearing frame (1), wherein a heat preservation tank (2) is fixedly arranged at the bottom layer of the bearing frame (1); and
the waste heat utilization device (3) is fixed on the two layers of the bearing frame (1), and is connected with the heat preservation tank (2) through the butt joint pipe (5), and the waste heat utilization device (3) is also in butt joint with a heating ventilation air conditioner.
2. A heating ventilation air conditioning heat recovery system as defined in claim 1, wherein: the waste heat utilization device (3) comprises:
the bin body (31) is fixed on the bearing frame (1), and a convection window (34) is fixedly arranged at the top of the bin body (31);
the waste heat recovery mechanism (4) is fixed in the bin body (31), one end of the waste heat recovery mechanism (4) is provided with a water inlet valve (36), and the other end of the waste heat recovery mechanism is connected with the butt joint pipe (5); and
and one end of the waste heat distribution mechanism (33) is connected to the waste heat recovery mechanism (4), and the other end of the waste heat distribution mechanism is connected with the heating ventilation air conditioner.
3. A heating ventilation and air conditioning heat recovery system according to claim 2, characterized in that the waste heat recovery mechanism (4) comprises:
the first temperature control mechanism (41) and the second temperature control mechanism (42) are symmetrically fixed in the bin body (31), and the first temperature control mechanism (41) and the second temperature control mechanism (42) are connected through an adjusting valve (46);
a first heat flow pipe (43), one end of which is connected with and communicated with the first temperature control mechanism (41) component, and the other end of which is connected with the waste heat distribution mechanism (33);
a second heat flow pipe (44), one end of which is connected with and conducted with the second temperature control mechanism (42) component, and the other end of which is connected with the waste heat distribution mechanism (33); and
and one end of the water outlet valve (45) is connected to the second temperature control mechanism (42), and the other end of the water outlet valve is connected to the second temperature control mechanism.
4. A heat recovery system of a heating ventilation air conditioner according to claim 3, wherein the waste heat distribution mechanism (33) mainly comprises a driving fan and a control valve, and a rotation speed sensor is further arranged on a main shaft of the driving fan, and the rotation speed sensor adjusts the control valve to open and close the first heat flow pipe (43) and the second heat flow pipe (44) according to the rotation speed of the driving fan.
5. A heat recovery system of a hvac system according to claim 3, wherein the first temperature control mechanism (41) and the second temperature control mechanism (42) are similar in structure, and each of them comprises:
a water storage tank (411) fixed in the bin body (31) and connected with the bin body through a pipeline;
a heat flow regulating mechanism (412) fixed on the water storage tank (411);
a heat flow connection shell (413) fixed on the heat flow regulating mechanism (412) and communicated with the heat flow regulating mechanism (412) by a convection tube (414); and
and one end of the heat conduction pipe (415) is fixed on the first heat flow pipe (43), and the other end of the heat conduction pipe is fixed on the heat flow connecting shell (413).
6. A heating ventilation air conditioning heat recovery system according to claim 5, characterized in that the heat flow regulating mechanism (412) comprises:
a plurality of brackets (4121) which are uniformly fixed on the surface of the water storage tank (411) around the circumference, and slide ways are arranged on the brackets (4121);
a housing (4122) fixed to the bracket (4121), wherein a plurality of mounting grooves are indirectly formed in the housing (4122);
a slider (4124) slidably disposed within the slideway,
the two telescopic rods (4123) are symmetrically arranged by taking the bracket (4121) as a central axis, the fixed ends are rotatably arranged in the mounting grooves, and the sliding ends are rotatably arranged on the sliding blocks (4124); and
the first arc-shaped plate (4125) and the second arc-shaped plate (4126) are respectively fixed at the sliding end of the telescopic rod (4123).
7. The heat recovery system of a hvac system according to claim 6, wherein the first arcuate plate (4125) and the second arcuate plate (4126) are provided with magnets on their contact surfaces, and the first arcuate plate (4125) is located above the second arcuate plate (4123), and a space formed by the first arcuate plate (4125), the second arcuate plate (4123) and the water storage tank (411) is a heating space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311807308.2A CN117570566B (en) | 2023-12-26 | Heat recovery system of heating ventilation air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311807308.2A CN117570566B (en) | 2023-12-26 | Heat recovery system of heating ventilation air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117570566A true CN117570566A (en) | 2024-02-20 |
| CN117570566B CN117570566B (en) | 2024-05-31 |
Family
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| DE202010005387U1 (en) * | 2010-05-06 | 2011-10-11 | Marten Breckling | Device for recovering the heat energy from the exhaust air of a building ventilation system |
| DE102014108118B3 (en) * | 2014-06-10 | 2015-02-12 | Hans-Jörg Heidelmeier | Domestic ventilation system with heating function |
| JP2016102446A (en) * | 2014-11-28 | 2016-06-02 | 株式会社三五 | Exhaust heat recovery device |
| CN214791808U (en) * | 2021-04-19 | 2021-11-19 | 周晓辉 | Warm logical air conditioner waste heat utilization equipment that leads to in industrial factory district |
| CN114484834A (en) * | 2022-01-20 | 2022-05-13 | 西安工程大学 | Waste heat recovery device for heating ventilation air conditioner |
| CN217541026U (en) * | 2022-03-02 | 2022-10-04 | 浙江星驰汽车有限公司 | Waste heat recovery device for automobile air conditioner external unit |
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200197795Y1 (en) * | 2000-05-02 | 2000-09-15 | 박춘경 | Air handling unit |
| JP2006057579A (en) * | 2004-08-23 | 2006-03-02 | Toyota Motor Corp | Exhaust heat recovering device |
| DE202010005387U1 (en) * | 2010-05-06 | 2011-10-11 | Marten Breckling | Device for recovering the heat energy from the exhaust air of a building ventilation system |
| CN201706779U (en) * | 2010-05-26 | 2011-01-12 | 广东欧科空调制冷有限公司 | Partial heat recovery multi-connected air-conditioner unit |
| DE102014108118B3 (en) * | 2014-06-10 | 2015-02-12 | Hans-Jörg Heidelmeier | Domestic ventilation system with heating function |
| JP2016102446A (en) * | 2014-11-28 | 2016-06-02 | 株式会社三五 | Exhaust heat recovery device |
| CN214791808U (en) * | 2021-04-19 | 2021-11-19 | 周晓辉 | Warm logical air conditioner waste heat utilization equipment that leads to in industrial factory district |
| CN114484834A (en) * | 2022-01-20 | 2022-05-13 | 西安工程大学 | Waste heat recovery device for heating ventilation air conditioner |
| CN217541026U (en) * | 2022-03-02 | 2022-10-04 | 浙江星驰汽车有限公司 | Waste heat recovery device for automobile air conditioner external unit |
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