CN110953674A - Multi-stage series fresh air handling unit and control method thereof - Google Patents
Multi-stage series fresh air handling unit and control method thereof Download PDFInfo
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- CN110953674A CN110953674A CN201911319373.4A CN201911319373A CN110953674A CN 110953674 A CN110953674 A CN 110953674A CN 201911319373 A CN201911319373 A CN 201911319373A CN 110953674 A CN110953674 A CN 110953674A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/007—Ventilation with forced flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Human Computer Interaction (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a multi-stage series fresh air unit and a control method thereof, wherein the fresh air unit comprises at least two independent fresh air fans, wherein a first air duct and a second air duct are arranged at an air outlet of an indoor unit of the previous fresh air fan, the first air duct is directly communicated with the indoor space, and the second air duct is connected with an air inlet of an indoor unit of the next fresh air fan in series. When the outdoor environment temperature is higher, the indoor units of the fresh air fans at all levels are connected in series, so that the plurality of fresh air fans cool the fresh air layer by layer, and the use effect of the fresh air unit is ensured while the normal operation of the compressor is ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-stage series fresh air handling unit and a control method thereof.
Background
In the prior art, the main function of a fresh air handling unit is to regulate the temperature. Due to the reasons of climate, dust, flying floc, air pollution and the like, people have to close daily 'ventilation openings' -doors and windows, but the problem of indoor air is more serious, the indoor air becomes a new 'disaster area' due to the problems of germs, oxygen deficiency, formaldehyde, oil smoke and the like, and a fresh air system walks into the field of vision of the public under the background of the clamping attack of internal and external pollution. The fresh air function of the fresh air unit is that air is pumped in through an air inlet, and is sent to the indoor after being primarily filtered roughly and shallowly and simultaneously cooled or heated.
Under the condition that a single fresh air unit works, when the outdoor environment temperature is high, fresh air entering from the outdoor will cause the suction pressure of the compressor to be increased, under the action of the compressor (keeping a certain pressure difference), the exhaust pressure of the compressor will be increased, and once the exhaust pressure of the compressor is greater than a pressure threshold value, the service life of the compressor is easily influenced. It is current practice to reduce the operating frequency of the compressor when the compressor discharge pressure is greater than a pressure threshold. But the working frequency of the compressor is reduced, so that the refrigerating effect of the fresh air handling unit cannot reach the indoor temperature set by a user, and the using effect of the fresh air handling unit is influenced.
Disclosure of Invention
The invention mainly aims to provide a multi-stage series fresh air handling unit and a control method thereof, and aims to solve the technical problem that the refrigeration effect of the fresh air handling unit cannot reach the indoor temperature set by a user due to higher outdoor environment temperature in the prior art.
A multi-stage series fresh air unit comprises at least two independent fresh air fans, wherein a first air channel and a second air channel are arranged at an air outlet of an indoor unit of the previous fresh air fan, the first air channel is directly communicated with the indoor unit, and the second air channel is connected with an air inlet of an indoor unit of the next fresh air fan in series.
Wherein, the air inlet of the indoor unit of the first-stage fresh air fan is communicated with the outside.
Wherein, the air outlet of the indoor unit of the last stage fresh air blower is communicated with the indoor.
And a temperature sensor is arranged on a refrigerant communication pipeline between the indoor unit and the outdoor unit of each stage of the fresh air machine.
Wherein, an air outlet temperature sensor and an air inlet temperature sensor are arranged in the air pipes connected in series with the upper-level indoor unit and the lower-level indoor unit.
The controller of the fresh air handling unit is respectively communicated with the fresh air handling units at all levels, so that linkage control of different fresh air handling units is realized.
The controller and each level of fresh air fans are in wired or wireless communication.
A controller of the fresh air handling unit is respectively communicated with all levels of fresh air handling units, the evaporation temperature of all started fresh air handling units is detected in real time, and linkage control of oil return/defrosting entering or exiting of different fresh air handling units is realized.
When detecting that one fresh air fan in the fresh air fan units needs to enter the oil return/defrosting operation, the controller controls all the started fresh air fans to synchronously enter the oil return/defrosting operation.
When detecting that one fresh air fan in the fresh air fan units does not finish oil return/defrosting operation, all the fresh air fans which finish the oil return/defrosting operation keep an oil return/defrosting operation state.
According to the multi-stage series fresh air handling unit and the control method thereof, when the outdoor environment temperature is high, the indoor units of the fresh air handling units at all stages are connected in series, so that the plurality of fresh air handling units cool the fresh air layer by layer, and the use effect of the fresh air handling unit is ensured while the normal operation of the compressor is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a plurality of serially connected fresh air handling units according to one embodiment of the present invention.
10. A fresh air handling unit; 1. a primary fresh air fan; 11. an indoor unit; 111. an air inlet; 112. an air outlet; 113. a first air duct; 114. a second air duct; 12. an outdoor unit; 2. a next-stage fresh air machine; 21. an indoor unit; 211. an air inlet; 212. an air outlet; 22. an outdoor unit; 3. a communicating pipe; 31. a temperature sensor; 4. an air duct; 41. an air outlet temperature sensor; 42. an inlet air temperature sensor; 5. and a controller.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the prior art, if the pressure threshold of the compressor is 45 pascal under the condition that a single fresh air handling unit works, the service life of the compressor is affected once the pressure threshold exceeds 50 pascal. When the outdoor environment temperature is 35 ℃, the suction pressure corresponding to 35 ℃ is 14 pascals, and the pressure difference is 30 pascals under the action of the compressor, so that the discharge pressure of the compressor is 44 pascals, and 44 pascals are normal pressure. When the outdoor environment temperature is 45 degrees, the suction pressure corresponding to 45 degrees is 22 pascals, so the discharge pressure of the compressor is 52 pascals, and 52 pascals is an abnormal pressure (exceeding a pressure threshold value), in order to guarantee the service life of the compressor, and therefore, the working frequency of the compressor is reduced. But the working frequency of the compressor is reduced, so that the refrigerating effect of the fresh air handling unit cannot reach the indoor temperature set by a user, and the using effect of the fresh air handling unit is influenced.
As shown in fig. 1, the multi-stage series-connected fresh air handling unit 10 includes at least two independent fresh air blowers (1, 2), wherein a first air duct 113 and a second air duct 114 are disposed at an air outlet 112 of an indoor unit 11 of the previous fresh air blower 1, the first air duct 113 is directly communicated with the indoor space, and the second air duct 114 is connected in series with an air inlet 211 of an indoor unit 21 of the next fresh air blower 2.
In this embodiment, when outdoor ambient temperature is higher, through establishing ties the indoor set of new fan at different levels for many new fans carry out cooling layer by layer to the new trend, thereby when guaranteeing compressor normal operating, guarantee the result of use of new fan group.
For example, if the pressure threshold of the compressor is 45 pa, the environment is now relatively harsh, the outdoor environment temperature is 54 degrees, the suction pressure corresponding to 54 degrees is 32 pa, and the pressure difference under the action of the compressor is 30 pa, so the discharge pressure of the compressor is 62 pa. When the number of the fresh air fans is two, outdoor high-temperature fresh air enters an indoor unit of a first fresh air fan, the temperature of the high-temperature fresh air is changed from 54 ℃ to 27 ℃ under the action of the first fresh air fan, the fresh air with the temperature of 27 ℃ enters an indoor unit of a second fresh air fan, and the suction pressure corresponding to the temperature of 27 ℃ is 10 pascals, so that the exhaust pressure of the compressor is 40 pascals, and 40 pascals is normal pressure. When the number of the fresh air fans is three, outdoor high-temperature fresh air enters an indoor unit of the first fresh air fan, and the temperature of the high-temperature fresh air is changed from 54 ℃ to 36 ℃ under the action of the first fresh air fan. The fresh air with the temperature of 36 ℃ enters an indoor unit of the second fresh air machine, and under the action of the second fresh air machine, the fresh air with the temperature of 36 ℃ is changed into the fresh air with the temperature of 18 ℃. Fresh air at 18 degrees enters an indoor unit of a third fresh air fan, and the exhaust pressure of the compressor is 38 pascals because the suction pressure corresponding to 18 degrees is 8 pascals, and 38 pascals are normal pressure.
In this embodiment, an average cooling mode is adopted, so as to ensure the normal operation of each compressor. As with the example above, when the number of fresh air blowers is two, each fresh air blower reduces the temperature by half. When the number of the new fans is three, the temperature of each new fan is reduced by one third. When the number of the new fans is four, the temperature of each new fan is reduced by one fourth, and so on. The more the number of the fresh air fans is, the smaller the load is.
In this embodiment, the air inlet 111 of the indoor unit 11 of the first stage fresh air blower 1 communicates with the outside, and the air outlet 212 of the indoor unit 21 of the last stage fresh air blower 2 communicates with the inside.
In this embodiment, the temperature sensor 31 is provided in the refrigerant communication duct 3 between the indoor units (11, 21) and the outdoor units (12, 22) of the respective stages of the fresh air machines (1, 2), and the outlet air temperature sensor 41 and the inlet air temperature sensor 42 are provided in the air duct 4 in which the upper-stage indoor unit 11 and the lower-stage indoor unit 21 are connected in series.
The inventor finds that when the fresh air fan is used for heating in winter, the outdoor unit of the fresh air fan is easy to frost, and the fresh air fan is used for refrigerating (only indoor air is not blown), so that the outdoor unit is heated, and frost of the outdoor unit is melted. If the quantity of new fan now is two, two new fans are mutually independent, and first new fan changes the frost and handles, and the second new fan changes the frost and handles, and present outdoor ambient temperature is minus 15 degrees, and the indoor temperature that the user set up is 25 degrees. Outdoor low-temperature fresh air enters the first indoor unit, and the temperature of the fresh air is still kept at minus 10 ℃ because the first fresh air fan defrosts. The new trend of minus 10 degrees gets into the indoor set of second, and under the effect of the new fan of second, the low temperature new trend becomes 10 degrees from minus 10, consequently, can't reach the indoor temperature that the user set up to influence the operational effect of fresh air handling unit.
In this embodiment, the controller 5 of the fresh air handling unit 10 is respectively in communication with each new blower (1, 2) to realize the linkage control of different new blowers (1, 2).
Specifically, the controller is in signal connection with each indoor unit, the outdoor units are in signal connection through a first communication network, and the indoor units and the outdoor units of the new fans are in signal connection through a second communication network.
In one embodiment, for example, if the number of the new fans is two, i.e., a new fan a and a new fan B, the new fan a includes an outdoor unit a and an indoor unit a, and the new fan B includes an outdoor unit B and an indoor unit B. When the outdoor unit A needs defrosting, the outdoor unit A sends a defrosting signal to the outdoor unit B through a first communication network; when the outdoor unit B receives the defrosting signal sent by the outdoor unit A, the feedback signal is sent to the outdoor unit A through the second communication network, and at the moment, the fresh air fan A and the fresh air fan B are synchronously defrosted. In the defrosting process, fans of the indoor unit A and the indoor unit B stop working, so that outdoor low-temperature fresh air is prevented from being blown into a room, and the using effect of the fresh air fans is ensured.
In an embodiment, for example, a user sends a defrosting signal to the indoor units of the new fans at each level through the controller, and after each indoor unit receives the defrosting signal, the defrosting signal is sent to the corresponding outdoor unit through the second communication network, so that synchronous defrosting of the new fans at each level is realized.
In this embodiment, the signal connection is a wireless communication connection. It will be appreciated that the signal connection may also be a wired communication connection.
In this embodiment, the number of the fresh air machines is two. It can be understood that the number of the fresh air machines is not limited to two, and is determined according to actual requirements.
In one embodiment, a control method for a multi-stage series connection fresh air handling unit is provided, and the control method specifically includes: the controller of the fresh air handling unit is respectively communicated with all levels of fresh air handling units, the evaporation temperature of all started fresh air handling units is detected in real time, and linkage control of entering or exiting of oil return/defrosting of different fresh air handling units is realized.
For example, if the number of the new fans is three, that is, the new fan a, the new fan B, and the new fan C, the outdoor unit a sends identification signals to the outdoor unit B and the outdoor unit C through the first communication network (the identification signals sent by each outdoor unit are different), and the outdoor unit B and the outdoor unit C also send identification signals to one of the outdoor units when the one of the outdoor units receives the identification signals sent by the other two outdoor units, the system is represented as a three-stage system. And one outdoor unit sends the information to the corresponding indoor unit through a second communication network, the indoor unit sends the information to the controller, and the controller displays icons of the three-level system through the touch screen and manually sets the serial numbers of the icons. For example, new fan A sets up to new fan No. one, and new fan B sets up to new fan No. two, and new fan C sets up to new fan No. three, and this moment, outdoor new trend is in proper order through new fan No. one, new fan No. two and new fan No. three. The fresh air fans at all levels can be controlled independently through the controller, and the fresh air fans at all levels can also be controlled synchronously.
It can be understood that one indoor unit may correspond to one outdoor unit or to a plurality of outdoor units. If the number of the outdoor units is multiple, the identification signals sent by the outdoor units to other outdoor units through the first communication network are the same, so that the number of the system stages is accurately judged.
In this embodiment, when it is detected that one of the fresh air handling units needs to enter the oil return/defrosting operation, the controller controls all the started fresh air handling units to synchronously enter the oil return/defrosting operation.
Specifically, a user sends a defrosting signal to the indoor units of the fresh air fans at all levels through the controller, and after each indoor unit receives the defrosting signal, the defrosting signal is sent to the corresponding outdoor unit through the second communication network, so that synchronous defrosting of the fresh air fans at all levels is realized.
In one embodiment, if the number of the new fans is two, that is, the new fan a and the new fan B, respectively, when the outdoor unit a needs defrosting, the outdoor unit a sends a defrosting flag (the defrosting flag is 1) to the outdoor unit B through the first communication network, the outdoor unit B receives the defrosting flag sent by the outdoor unit a and sends a feedback signal to the outdoor unit a through the second communication network, and at this time, the new fan a and the new fan B synchronously defrost, thereby ensuring the use effect of the new fan group. When the outdoor unit A finishes defrosting, the outdoor unit A sends an ending flag bit (the ending flag bit is 0) to the outdoor unit B through the first communication network, the outdoor unit B receives the ending flag bit sent by the outdoor unit A and sends a feedback signal to the outdoor unit A through the second communication network, and at the moment, the fresh air fan A and the fresh air fan B finish defrosting synchronously and return to the previously set mode to operate synchronously.
In this embodiment, when it is detected that one of the fresh air handling units does not complete the oil return/defrosting operation, all the fresh air handling units that have completed the oil return/defrosting operation maintain the oil return/defrosting operation state.
Specifically, in the oil return/defrosting process, when a new fan which does not finish the oil return/defrosting action exists, the new fan which does not finish the oil return/defrosting action continues to wait until all the new fans finish the oil return/defrosting action, and all the new fans synchronously quit the oil return/defrosting action and return to the operation in the previously set mode.
In view of the above description of the multi-stage series fresh air handling unit and the control method thereof provided by the present invention, those skilled in the art will appreciate that there are variations in the embodiments and applications of the concept of the present invention, and in summary, the present disclosure should not be construed as limiting the present invention.
Claims (10)
1. The novel fan set is characterized by comprising at least two independent fresh air fans, wherein a first air channel and a second air channel are arranged at an air outlet of an indoor unit of the previous fresh air fan, the first air channel is directly communicated with the indoor space, and the second air channel is connected with an air inlet of an indoor unit of the next fresh air fan in series.
2. The fresh air handling unit as claimed in claim 1, wherein an air inlet of the indoor unit of the first stage fresh air blower is communicated with the outside.
3. The fresh air handling unit of claim 1, wherein an air outlet of an indoor unit of the last stage fresh air blower is communicated with a room.
4. The fresh air handling unit according to claim 1, wherein a temperature sensor is provided in a refrigerant communication pipe between the indoor unit and the outdoor unit of each fresh air blower.
5. The fresh air handling unit as claimed in claim 1, wherein an air outlet temperature sensor and an air inlet temperature sensor are provided in the air pipes connected in series with the upper-stage indoor unit and the lower-stage indoor unit.
6. The fresh air handling unit according to claim 1, wherein the controller of the fresh air handling unit is respectively in communication with each level of fresh air handling unit to realize linkage control of different fresh air handling units.
7. The fresh air handling unit of claim 6 wherein the controller communicates with each fresh air handling unit by wire or wirelessly.
8. A control method of a multi-stage series fresh air handling unit is characterized in that a controller of the fresh air handling unit is respectively communicated with all stages of fresh air handling units, the evaporation temperature of all started fresh air handling units is detected in real time, and linkage control of entering or exiting of oil return/defrosting of different fresh air handling units is achieved.
9. The control method according to claim 8, wherein when it is detected that one of the fresh air handling units needs to enter the oil return/defrosting operation, the controller controls all the started fresh air handling units to synchronously enter the oil return/defrosting operation.
10. The control method according to claim 9, wherein when it is detected that one of the fresh air handling units does not complete the oil return/defrosting operation, all of the fresh air handling units that have completed the oil return/defrosting operation maintain an oil return/defrosting operation state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911319373.4A CN110953674A (en) | 2019-12-19 | 2019-12-19 | Multi-stage series fresh air handling unit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911319373.4A CN110953674A (en) | 2019-12-19 | 2019-12-19 | Multi-stage series fresh air handling unit and control method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87208538U (en) * | 1987-05-25 | 1987-11-25 | 武汉冷冻机厂 | Screw stem type temp. regulation and wetness reduction machine |
| JP2009281698A (en) * | 2008-05-26 | 2009-12-03 | Hitachi Appliances Inc | Air conditioner |
| CN101737867A (en) * | 2008-11-17 | 2010-06-16 | 三菱电机株式会社 | Air-conditioning apparatus |
| CN201954681U (en) * | 2011-01-22 | 2011-08-31 | 浙江盾安人工环境股份有限公司 | Multistage all-condition continuous heat pump air discharge and heat recovery air-conditioning system with humidification device |
| CN110173821A (en) * | 2019-05-29 | 2019-08-27 | 南京天加环境科技有限公司 | A kind of multi-line system and its control method that can improve defrosting effect |
-
2019
- 2019-12-19 CN CN201911319373.4A patent/CN110953674A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87208538U (en) * | 1987-05-25 | 1987-11-25 | 武汉冷冻机厂 | Screw stem type temp. regulation and wetness reduction machine |
| JP2009281698A (en) * | 2008-05-26 | 2009-12-03 | Hitachi Appliances Inc | Air conditioner |
| CN101737867A (en) * | 2008-11-17 | 2010-06-16 | 三菱电机株式会社 | Air-conditioning apparatus |
| CN201954681U (en) * | 2011-01-22 | 2011-08-31 | 浙江盾安人工环境股份有限公司 | Multistage all-condition continuous heat pump air discharge and heat recovery air-conditioning system with humidification device |
| CN110173821A (en) * | 2019-05-29 | 2019-08-27 | 南京天加环境科技有限公司 | A kind of multi-line system and its control method that can improve defrosting effect |
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Application publication date: 20200403 |