CN206181683U - Be used for big difference in temperature terminal air conditioning device of rack refrigerated - Google Patents
Be used for big difference in temperature terminal air conditioning device of rack refrigerated Download PDFInfo
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- CN206181683U CN206181683U CN201621084756.XU CN201621084756U CN206181683U CN 206181683 U CN206181683 U CN 206181683U CN 201621084756 U CN201621084756 U CN 201621084756U CN 206181683 U CN206181683 U CN 206181683U
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- temperature difference
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Abstract
The utility model discloses a be used for big difference in temperature terminal air conditioning device of rack refrigerated, the intelligent cabinet temperature adjusting device comprises a cabinet body, the internal air that is provided with of cabinet liquid heat exchange module and gas flow distribution module, the air does liquid heat exchange module include a plurality of parallel arrangement's air liquid heat exchanger, the gas flow distribution module is including air supply air current guide blade, return air air current guide blade and a set of fan, air supply air current guide blade the fan the air liquid heat exchanger with return air air current guide blade set gradually in the cabinet is internal. The utility model has the advantages of: the utility model discloses a make the cold source reduce the air flow transport distance near the mode of rack, reduce the air flow transport energy consumption, and the local overheat phenomenon can not appear.
Description
Technical field
The utility model is related to data center's air conditioner energy-saving system technical field, particularly a kind of for the big of rack cooling
Temperature difference air conditioner end equipment.
Background technology
Data center is a place that have accumulated a large amount of servers, storage device, the network equipment, is to realize data message
The service platform of business such as focus on, store, transmit, exchange and manage.The power consumption of data center is main by information equipment, sky
Adjusting system and the part of power supply-distribution system three are constituted, and wherein air-conditioning system power consumption accounts for the 40% of total amount.With China's information industry
Fast development, data center will be presented explosive growth, and its power consumption increases by geometric progression, and energy resource consumption is huge.
With the further raising of information equipment integrated level, single server operational capability and caloric value are significantly increased, together
Shi Tiji is less and less, causes data center's Single Cabinet power density to increase sharply, and conventional overhead under-floor air supply mode is
Gradually the cooling requirement of high power density rack cannot be met.Also, traditional underfloor air distribution due to low-temperature receiver apart from thermal source farther out,
Air current composition is not reasonable, brings data center's rack cooling problem that not enough abundant and energy consumption remains high.
Improve consumption of data center and end effectively cools down problem and needs to change the air-supply of available data center air-conditioner end
Form, makes low-temperature receiver close proximity to thermal source, while to make full use of free natural cooling source to be cooled down.Existing precise machine room air conditioner is cold
Jelly water supply water temperature is relatively low and supply backwater temperature difference is smaller, and supply backwater temperature difference is usually 5 DEG C, and main frame efficiency is relatively low and is unfavorable for exempting from
Take making full use of for natural cooling source.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of big temperature difference for rack cooling
Air-conditioner tail end equipment, the device circulating liquid flow is low, for/return that liquid temperature difference is big, cooling effectiveness is high, solve prior art presence
Problem.
The utility model is achieved through the following technical solutions：A kind of big temperature difference air conditioner end for rack cooling
Device includes cabinet, and air-liquid heat exchange module and distribution of air flow module are provided with the cabinet, and the air-liquid is changed
Thermal modules include several air-liguid heat exchangers arranged in parallel, and the distribution of air flow module includes air-supply air-flow directing vane
Piece, return air stream guide vane and one group of blower fan, the air-supply air vane guide, the blower fan, air-liquid heat exchange
Device and the return air stream guide vane are set in turn in the cabinet.
In the utility model, the big temperature difference air conditioner end equipment for rack cooling is connected with control system, according to control
The signal that system monitoring processed is arrived, makes big temperature difference air conditioner end equipment be realized automatically adjusting according to control system.
Control system is led by monitoring rack server input current and return air inlet temperature to rotation speed of fan, air-supply air-flow
To blade angle, the angle of rotatable air-liguid heat exchanger and in air-liquid heat exchange module, refrigerating flow rate of liquid is carried out
Regulation.When equipment cabinet server input current increases or the vertical each point air themperature of return air inlet is improved, increase rotation speed of fan is caused
Air quantity increases；And air-supply air vane guide is rotated to an angle so that air-supply air flow direction and server air intake direction
Angle is smaller, to increase server air intake wind speed；Now rotatable air-liguid heat exchanger keeps vertical with air flow direction.When
When equipment cabinet server input current reduces and return air inlet temperature is reduced, reduce rotation speed of fan and cause that air quantity reduces；And make air-supply gas
Stream guide vane rotates to an angle so that air-supply air flow direction is smaller with the angle in server air intake direction；And regulation can revolve
Turn air-liguid heat exchanger and be less than 90 ° with the angle of air flow direction；And reduce refrigerating liquid in air-liquid heat exchange module
Flow velocity.
The utility model is packaged in one by by the big temperature difference air conditioner end equipment cooled down for rack with cooled rack
In the individual construction isolated with building environment, the construction has heat insulating effect, and it realizes the part only implemented to rack
Environment is cooled down, it is to avoid the energy waste caused by because cooling down whole building environment, while reducing the requirement to building environment temperature.
Big temperature difference air conditioner end equipment for rack cooling is arranged in the side of rack, may be located between two racks
Or positioned at separate unit rack side；The height of big temperature difference air conditioner end equipment is highly same or like with rack；Big temperature difference air conditioner
The horizontal depth of end equipment is more than the horizontal depth of rack, and air outlet position protrudes from cabinet front, and return air inlet position protrudes from machine
The cabinet back side.
Being used for the workflow of the big temperature difference air conditioner end equipment of rack cooling in the utility model is：Rear of cabinet is serviced
Device discharge hot-air by return air guide vane change flow direction after, reversely flow into air-liquid heat exchange module, by air-
After liquid heat exchange module, hot-air is cooled to be cooled to suitable temperature, then air-supply air-flow directing vane is flowed to after blower fan supercharging
Piece changes wind direction, and the server air inlet of ultimately reverse inflow cabinet front forms horizontal closed circulation.
The air quantity of the blower fan can be realized automatically adjusting according to the real-time caloric value of rack, the air-supply air vane guide
Angle can be realized automatically adjusting according to the real-time caloric value of rack；Air-supply air vane guide and the return air stream guide vane
It is arrangement vertically.
Preferably, described several air-liguid heat exchangers are connected in series or are connected in parallel.Air-liguid heat exchanger
Being connected in series can increase liquid flow line inner surface area and liquid flow path length realizes that low discharge, the big temperature difference set
Meter purpose.
Preferably, at least one of described several air-liguid heat exchangers are provided with whirligig, the rotating dress
The anglec of rotation put is not more than 90 °.One or more air-liguid heat exchangers can be with root in several air-liguid heat exchangers
Rotated along its own vertical axis according to the change of rack caloric value, the anglec of rotation is adjusted automatically according to rack caloric value size
Section, anglec of rotation maximum can reach 90 °, be provided with the air-liguid heat exchanger of whirligig using mode and the collection of being flexible coupling
Liquid pipe and liquid back pipe are connected.
The mode that automatically adjusts for being provided with the air-liguid heat exchanger of whirligig is to monitor every clothes by control system
Vertical each point air themperature is realized at business device input electric power and return air stream guide vane；The automatic tune of the fan delivery
Section mode is by monitoring at every server input electric power and return air stream guide vane vertical each point air themperature come real
It is existing；It is by monitoring every server input electric power and return air gas that the air-supply air vane guide angle automatically adjusts mode
Vertical each point air themperature is realized at stream guide vane.
Preferably, the air-liguid heat exchanger is concurrent flow micro-channel heat exchanger or fin-tube type heat exchanger.
Preferably, the temperature difference of the cooling medium of the air-liguid heat exchanger is 10~15 DEG C, and the cooling medium is
Water.The temperature difference of cooling medium is 10~15 DEG C, can more make full use of free natural cooling source, is being configured with the number of cold accumulation system
According to center, big temperature difference cooling mode can also increase the cold-storage temperature difference of cold accumulation system, improve cold accumulation system cold-storage ability, on the one hand
More preferably peak load shifting effect can be realized, more natural cold quantities on the other hand can be stored for free cold supply.
Preferably, the blower fan vertical array.
Preferably, the refrigerating liquid of the air-liguid heat exchanger uses two-way feed flow, and two-way is respectively from different low-temperature receivers
Feed pipe connect the feed tube of the air-liguid heat exchanger simultaneously, the drain pipe of air-liguid heat exchanger is connected and gone simultaneously
Toward the liquid back pipe of different low-temperature receivers.Two-way liquid-supplying system in the utility model backups each other in operation, and the same time only has
Liquid circulation all the way, when the loop circulated is broken down, another Loop Liquid will automatically begin to circulation.
The beneficial effects of the utility model are：
1st, the utility model reduces air-flow fed distance making low-temperature receiver by way of rack, reduces air-flow conveying energy
Consumption, and be not in hot-spot phenomenon；
2nd, the utility model increases single heat exchanger heat-transfer surface by increasing circulating liquid flow line inner surface area
Product, is connected in series by by some heat exchangers, dramatically increases circulating liquid flow-path-length, is fully connect by with air
Heat exchange is touched, circulating liquid low discharge is realized, is imported and exported the method for operation of the big temperature difference
3rd, the utility model is poor by increasing circulating liquid confession/time liquid temperature, improves circulating liquid outlet temperature, can be notable
Increase free natural coldness resource utilizing rate, reduce the electrical chillers opening time, reduce data center's air conditioning energy consumption；
4th, the utility model by increase circulating liquid confession/return liquid temperature it is poor, the data center to being configured with cold accumulation system, energy
The cold-storage temperature difference of cold accumulation system is enough significantly increased, cold accumulation system cold-storage ability is improved, more preferably peak load shifting effect is on the one hand realized
Really, network load is reduced, more natural cold quantities is on the other hand stored for free cold supply；
5th, the utility model can be carried out air quantity and be automatically adjusted using the blower fan of quantity-adjustable according to rack caloric value,
Dynamic change to rack caloric value is responded rapidly, in time takes away heat, realizes the dynamic regulation for rack cooling；
6th, the utility model sets air vane guide in air outlet and return air inlet, effectively reduces air-flow and changes when flowing to
Local resistance loss, air outlet air vane guide can automatically adjust blade angle according to rack caloric value, realize to rack
More effectively cooling；
7th, the utility model is packaged in a construction isolated with building environment by with cooled rack, the structure
Thing has heat insulating effect, and it realizes the local environment cooling only implemented to rack, it is to avoid made because cooling down whole building environment
Into energy waste, while reducing the requirement to building environment temperature.
Brief description of the drawings
Fig. 1 is the structural representation of the big temperature difference air conditioner end equipment that embodiment 1 is used for rack cooling；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is the front view of Fig. 1；
Fig. 4 is the big temperature difference air conditioner end equipment three-dimensional perspective that embodiment 1 is used for rack cooling；
Fig. 5 is the big air-liguid heat exchanger of temperature difference air conditioner end equipment the 3rd rotation one that embodiment 1 is used for rack cooling
Determine the structural representation after angle；
Fig. 6 is the top view of Fig. 5；
Fig. 7 is that embodiment 1 is used for the big temperature difference air conditioner end equipment multiple air-liguid heat exchanger of rack cooling using simultaneously
Connection mode connection diagram, and two-way feed flow schematic diagram；
Fig. 8 is that embodiment 1 is used for the big temperature difference air conditioner end equipment multiple air-liguid heat exchanger of rack cooling using string
Connection mode connection diagram；
Reference implication in figure：1st, cabinet；2nd, rack；3rd, air-supply air vane guide；4th, blower fan；5th, return air stream is led
To blade；6th, the first air-liguid heat exchanger；7th, the second air-liguid heat exchanger；8th, the 3rd air-liguid heat exchanger；9th, revolve
Rotary device；10th, construction；11st, access path；12nd, the first feed pipe；13rd, the second feed pipe；14th, the first liquid back pipe；15th,
Two liquid back pipes.
Specific embodiment
Content of the present utility model is described in further details with reference to the accompanying drawings and detailed description.
Embodiment 1
Refering to Fig. 1 to Fig. 8, Fig. 2 and Fig. 5 arrows show the path of air-supply flowing, Fig. 7 and Fig. 8 arrows show current
Direction.To be packaged in one and isolate with building environment for the big temperature difference air conditioner end equipment and cooled rack 2 of rack cooling
Construction 10 in, with prevent the inner space of construction 10 with outside building environment produce heat transfer, for rack cooling
Big temperature difference air conditioner end equipment be arranged at the side of cooled rack 2, or for the big temperature difference air conditioner end dress of rack cooling
Install and be placed between two cooled racks；
Big temperature difference air conditioner end equipment and cooled rack for rack cooling are connected with control system, are according to control
The signal that system is monitored, the big temperature difference air conditioner end equipment for being used in rack cooling is realized automatically adjusting according to control system.
Control system is led by monitoring rack server input current and return air inlet temperature to rotation speed of fan, air-supply air-flow
To blade angle, the angle of rotatable air-liguid heat exchanger and in air-liquid heat exchange module, refrigerating flow rate of liquid is carried out
Regulation.When equipment cabinet server input current increases or the vertical each point air themperature of return air inlet is improved, increase rotation speed of fan is caused
Air quantity increases；And air-supply air vane guide is rotated to an angle so that air-supply air flow direction and server air intake direction
Angle is smaller, to increase server air intake wind speed；Now rotatable air-liguid heat exchanger keeps vertical with air flow direction.When
When equipment cabinet server input current reduces and return air inlet temperature is reduced, reduce rotation speed of fan and cause that air quantity reduces；And make air-supply gas
Stream guide vane rotates to an angle so that air-supply air flow direction is smaller with the angle in server air intake direction；And regulation can revolve
Turn air-liguid heat exchanger and be less than 90 ° with the angle of air flow direction；And reduce refrigerating liquid in air-liquid heat exchange module
Flow velocity.
It is provided with construction for overhaul of the equipments and the access path 11 safeguarded.In the present embodiment, for rack cooling
Big temperature difference air conditioner end equipment be arranged between two cooled racks, the set location of the big temperature difference air conditioner end equipment can
According to specific operating mode it is actual determine, the purpose of the setting of its position be make low-temperature receiver against rack mode reduce air-flow conveying away from
From, reduction air-flow conveying energy consumption, and be not in hot-spot phenomenon.
The utility model is packaged in one by by the big temperature difference air conditioner end equipment cooled down for rack with cooled rack
In the individual construction isolated with building environment, the construction has heat insulating effect, and it realizes the part only implemented to rack
Environment is cooled down, it is to avoid the energy waste caused by because cooling down whole building environment, while reducing the requirement to building environment temperature.
Big temperature difference air conditioner end equipment for rack cooling is arranged in the side of rack, may be located between two racks
Or positioned at separate unit rack side；The height of big temperature difference air conditioner end equipment is highly same or like with rack；Big temperature difference air conditioner
The horizontal depth of end equipment is more than the horizontal depth of rack, and air outlet position protrudes from cabinet front, and return air inlet position protrudes from machine
The cabinet back side.
Big temperature difference air conditioner end equipment for rack cooling includes being provided with air-liquid heat exchange in cabinet 1, cabinet 1
Module and distribution of air flow module, air-liquid heat exchange module include several air-liguid heat exchangers arranged in parallel, air-flow
Distribute module includes air-supply air vane guide 3, return air stream guide vane 5 and one group of vertically disposed blower fan 4, air-flow of blowing
Guide vane 3, blower fan 4, air-liguid heat exchanger and return air stream guide vane 5 are set in turn in the cabinet.
The temperature difference of the cooling medium of air-liguid heat exchanger is 10~15 DEG C, and refrigerating liquid is water, acetone or other refrigeration
Working medium, in the present embodiment, preferably refrigerating liquid is water, can according to actual needs convert refrigerating liquid.The temperature difference of cooling medium
It is 10~15 DEG C, can more makes full use of free natural cooling source, is being configured with the data center of cold accumulation system, big temperature difference cooling
Mode can also increase the cold-storage temperature difference of cold accumulation system, improve cold accumulation system cold-storage ability, on the one hand can realize more preferably moving
Peak load effect, on the other hand can store more natural cold quantities for free cold supply.
The cooling medium of air-liguid heat exchanger uses two-way feed flow, and two-way is same respectively from the feed pipe of different low-temperature receivers
When connection air-liquid heat exchange module feed tube, the drain pipe of air-liquid heat exchange module connect simultaneously go to it is different cold
The liquid back pipe in source；Two-way liquid-supplying system in the utility model backups each other in operation, and the same time only has liquid all the way to follow
Ring, when the loop circulated is broken down, another Loop Liquid will automatically begin to circulation.
Air-liguid heat exchanger can be concurrent flow micro-channel heat exchanger or fin-tube type heat exchanger, in the present embodiment, sky
Solution-air body heat exchanger is concurrent flow micro-channel heat exchanger, and air-liguid heat exchanger has 3, is respectively that the first air-liquid is changed
Hot device 6, the second air-liguid heat exchanger 7 and the 3rd air-liguid heat exchanger 8.
The quantity of air-liguid heat exchanger its can determine that those skilled in the art can according to the need for actual conditions
With the quantitative range expected its within protection domain of the present utility model.
Being used for the workflow of the big temperature difference air conditioner end equipment of rack cooling in the utility model is：Rear of cabinet is serviced
Device discharge hot-air by return air guide vane change flow direction after, reversely flow into air-liquid heat exchange module, by air-
After liquid heat exchange module, hot-air is cooled and is cooled to the temperature of setting in control system, then flows to air-supply after blower fan supercharging
Air vane guide changes wind direction, and the server air inlet of ultimately reverse inflow cabinet front forms horizontal closed circulation.
The air quantity of blower fan can be realized automatically adjusting according to the real-time caloric value of rack, and air-supply air vane guide angle can be with
Realize automatically adjusting according to the real-time caloric value of rack；Air-supply air vane guide and return air stream guide vane are vertical cloth
Put.
Several air-liguid heat exchangers are connected in series or are connected in parallel.In the present embodiment, the first air-liquid is changed
Hot device 6, the second air-liguid heat exchanger 7 and the 3rd air-liguid heat exchanger 8 are connected in series, and the connected mode can increase liquid
Body flow line inner surface area and liquid flow path length realize the purpose of design of low discharge, the big temperature difference as shown in figure 8, system
After cold liquid is through the first feed pipe 12 or the second feed pipe 13, the 3rd air-liguid heat exchanger 8, second is successively sequentially entered empty
Solution-air body heat exchanger 7 and the first air-liguid heat exchanger 6, discharge through the first liquid back pipe 14 or the second liquid back pipe 15.
Several air-liguid heat exchangers can be connected in parallel according to actual conditions selection, as shown in fig. 7, refrigerant liquid is passed through
After first feed pipe 12 or the second feed pipe 13, respectively through the 3rd air-liguid heat exchanger 8, the second air-liguid heat exchanger
7 and first after air-liguid heat exchanger 6, and the 3rd air-liguid heat exchanger 8, the second air-liguid heat exchanger 7 and first is empty
Discharged through the first liquid back pipe 14 or the second liquid back pipe 15 after the refrigerant liquid mixing of the discharge of solution-air body heat exchanger 6.
One or more air-liguid heat exchangers can set whirligig, in the present embodiment, the 3rd empty solution-air
Body heat exchanger 8 is provided with whirligig 9, and the anglec of rotation of whirligig 9 is not more than 90 °.In several air-liguid heat exchangers
One or more air-liguid heat exchangers can be rotated according to the change of rack caloric value along its own vertical axis, be revolved
Gyration is automatically adjusted according to rack caloric value size, and anglec of rotation maximum can reach 90 °, is provided with the sky of whirligig
Solution-air body heat exchanger is connected using the mode that is flexible coupling with collector tube and liquid back pipe.It is illustrated in figure 5 the heat exchange of the 3rd air-liquid
Device 8 rotate to an angle after big air-conditioner tail end equipment structural representation.
The mode that automatically adjusts for being provided with the 3rd air-liguid heat exchanger 8 of whirligig is monitored by control system
Vertical each point air themperature is realized at every server input electric power and return air stream guide vane；Fan delivery it is automatic
Regulative mode be by monitor at every server input electric power and return air stream guide vane vertical each point air themperature come
Realize；It is by monitoring every server input electric power and return air stream that air-supply air vane guide angle automatically adjusts mode
Vertical each point air themperature is realized at guide vane.
Above-listed detailed description is directed to illustrating for the utility model possible embodiments, and the embodiment is simultaneously not used to limitation
The scope of the claims of the present utility model, all equivalence enforcements or change without departing from carried out by the utility model are intended to be limited solely by this case
In the scope of the claims.
Claims (7)
1. it is a kind of for rack cooling big temperature difference air conditioner end equipment, it is characterised in that：Including cabinet, set in the cabinet
There are air-liquid heat exchange module and distribution of air flow module, the air-liquid heat exchange module includes several skies arranged in parallel
Solution-air body heat exchanger, the distribution of air flow module includes air-supply air vane guide, return air stream guide vane and one group of wind
Machine, the air-supply air vane guide, the blower fan, the air-liguid heat exchanger and the return air stream guide vane according to
Secondary to be arranged in the cabinet, the temperature difference of the cooling medium of the air-liguid heat exchanger is 10~15 DEG C.
2. it is according to claim 1 for rack cooling big temperature difference air conditioner end equipment, it is characterised in that：It is described some
Individual air-liguid heat exchanger is connected in series or is connected in parallel.
3. it is according to claim 1 for rack cooling big temperature difference air conditioner end equipment, it is characterised in that：It is described some
At least one of individual air-liguid heat exchanger is provided with whirligig, and the anglec of rotation of the whirligig is not more than 90 °.
4. it is according to claim 1 for rack cooling big temperature difference air conditioner end equipment, it is characterised in that：The sky
Solution-air body heat exchanger is concurrent flow micro-channel heat exchanger or fin-tube type heat exchanger.
5. it is according to claim 1 for rack cooling big temperature difference air conditioner end equipment, it is characterised in that：The cooling
Medium is water.
6. it is according to claim 1 for rack cooling big temperature difference air conditioner end equipment, it is characterised in that：The blower fan
Vertical array.
7. it is according to claim 1 for rack cooling big temperature difference air conditioner end equipment, it is characterised in that：The sky
The refrigerating liquid of solution-air body heat exchanger uses two-way feed flow, two-way to connect described simultaneously respectively from the feed pipe of different low-temperature receivers
The feed tube of air-liguid heat exchanger, the drain pipe of air-liguid heat exchanger connects time liquid for going to different low-temperature receivers simultaneously
Pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621084756.XU CN206181683U (en) | 2016-09-26 | 2016-09-26 | Be used for big difference in temperature terminal air conditioning device of rack refrigerated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621084756.XU CN206181683U (en) | 2016-09-26 | 2016-09-26 | Be used for big difference in temperature terminal air conditioning device of rack refrigerated |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206181683U true CN206181683U (en) | 2017-05-17 |
Family
ID=58676889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621084756.XU Active CN206181683U (en) | 2016-09-26 | 2016-09-26 | Be used for big difference in temperature terminal air conditioning device of rack refrigerated |
Country Status (1)
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| CN (1) | CN206181683U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631464A (en) * | 2017-09-13 | 2018-01-26 | 珠海格力电器股份有限公司 | Heat exchanger assembly and its design method, air conditioner |
| CN111854007A (en) * | 2019-04-28 | 2020-10-30 | 上海科力玛数据科技有限公司 | High-water-temperature and large-temperature-difference air conditioner terminal equipment |
| CN114832877A (en) * | 2022-06-07 | 2022-08-02 | 华北电力大学（保定） | Full-automatic variable air volume adjusting device for biosafety cabinet |
-
2016
- 2016-09-26 CN CN201621084756.XU patent/CN206181683U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631464A (en) * | 2017-09-13 | 2018-01-26 | 珠海格力电器股份有限公司 | Heat exchanger assembly and its design method, air conditioner |
| CN111854007A (en) * | 2019-04-28 | 2020-10-30 | 上海科力玛数据科技有限公司 | High-water-temperature and large-temperature-difference air conditioner terminal equipment |
| CN114832877A (en) * | 2022-06-07 | 2022-08-02 | 华北电力大学（保定） | Full-automatic variable air volume adjusting device for biosafety cabinet |
| CN114832877B (en) * | 2022-06-07 | 2023-05-05 | 华北电力大学（保定） | Variable air volume adjusting device for full-automatic biological safety cabinet |
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