Fresh air air conditioner and control method thereof

Abstract

The present invention provides a fresh air air conditioner and a control method thereof. The fresh air air conditioner comprises: a fresh air inlet, an exhaust air inlet, an exhaust air outlet, a fresh air outlet, a heat exchange core, a fresh air channel and a fresh air bypass channel. The fresh air sucked in through the fresh air inlet can enter the fresh air channel and perform heat exchange with the exhaust air entering through the exhaust air inlet at the heat exchange core, and the fresh air sucked in through the fresh air inlet can also enter the fresh air bypass channel. The airflow in the fresh air bypass channel does not pass through the heat exchange core for heat exchange but directly enters the room through the fresh air outlet. According to the present invention, the fresh air bypass channel is passed through, and the fresh air bypass channel does not exchange heat with the heat exchange core, so that when the temperature difference between the outdoor fresh air and the indoor exhaust air is small, it is not necessary to flow through the heat exchange core for heat exchange, thereby effectively reducing the load when fresh air heat exchange is not required, reducing wind resistance, and improving the life of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a fresh air air conditioner and a control method thereof. Background Art

[0002] The existing equipment for indoor air treatment mainly includes fresh air haze removers, fresh air ventilators, air purifiers, etc. Some of these devices only exchange and recover heat from indoor and outdoor air, some filter the air, and air purifiers mainly purify indoor air. These devices have single functions and cannot have the functions of cooling, heating, energy recovery or bypass at the same time. The energy-saving effect is not significant, or they need to be used together with traditional air conditioners, which requires repeated installation and wastes manpower and material resources.

[0003] Since the fresh air air conditioning system in the prior art has technical problems such as high load when no fresh air heat exchange is required, resulting in energy loss and affecting the system life, the present invention studies and designs a fresh air air conditioner and a control method thereof. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the fresh air air-conditioning system in the prior art that the load is high when fresh air heat exchange is not required, resulting in energy loss and affecting the life of the system, thereby providing a fresh air air-conditioning machine and its control method.

[0005] In order to solve the above problems, the present invention provides a fresh air air conditioner, which comprises:

[0006] A fresh air inlet, an exhaust air inlet, an exhaust air outlet, a fresh air outlet, a heat exchange core, a fresh air channel and a fresh air bypass channel. The fresh air sucked in through the fresh air inlet can enter the fresh air channel and exchange heat with the exhaust air entering through the exhaust air inlet at the heat exchange core, and the fresh air sucked in through the fresh air inlet can also enter the fresh air bypass channel. The airflow in the fresh air bypass channel does not pass through the heat exchange core for heat exchange but directly enters the room through the fresh air outlet.

[0007] In some embodiments, an exhaust chamber is further included, the exhaust chamber is communicated with the exhaust inlet, and the fresh air channel can be communicated with the fresh air inlet, and the heat exchange core is located between the fresh air channel and the exhaust chamber, so that the fresh air in the fresh air channel and the exhaust air in the exhaust chamber are heat exchanged at the heat exchange core;

[0008] Furthermore, the fresh air bypass channel can also be connected to the fresh air inlet, and the heat exchange core does not perform heat exchange on the fresh air bypass channel.

[0009] In some embodiments, the fresh air channel is arranged in the exhaust chamber, the fresh air bypass channel is also arranged in the exhaust chamber, the fresh air channel is connected to the fresh air bypass channel, and the heat exchange core only contacts and exchanges heat with the fresh air channel; the exhaust outlet is connected to the exhaust chamber, and an exhaust fan is also arranged in the exhaust chamber.

[0010] In some embodiments, a fresh air chamber is further included, which is connected between the fresh air inlet and the fresh air channel or the fresh air bypass channel, one end of the fresh air chamber is connected to the fresh air inlet, and the other end is connected to the fresh air channel or the fresh air bypass channel; and a fresh air filter and the fresh air preheating device are also provided inside the fresh air chamber, and along the air flow direction, the fresh air entering from the fresh air inlet can flow through the fresh air filter and the fresh air preheating device in sequence.

[0011] In some embodiments, the fresh air chamber is further provided with a first filter, and the first filter is provided between the fresh air filter and the fresh air inlet;

[0012] A second filter is also provided at the exhaust inlet to filter the indoor exhaust air sucked into the exhaust inlet.

[0013] In some embodiments, a fresh air valve is further included, and the fresh air valve can control the opening or closing of the fresh air channel, and the fresh air valve can also control the opening or closing of the fresh air bypass channel;

[0014] The fresh air valve also includes a fresh air valve motor, a fresh air sweep blade, a fresh air bypass air valve motor and a fresh air bypass sweep blade. The fresh air sweep blade is located in the fresh air duct, and the fresh air bypass sweep blade is located in the fresh air bypass air duct. The fresh air valve motor can control the movement of the fresh air sweep blade to open or close the fresh air channel, and the fresh air bypass air valve motor can control the movement of the fresh air bypass sweep blade to open or close the fresh air bypass channel.

[0015] In some embodiments, it also includes an internal circulation chamber, an internal circulation air inlet and an internal circulation air valve, wherein the internal circulation air inlet is connected to the internal circulation chamber, one end of the internal circulation chamber is also connected to the fresh air channel and the fresh air bypass channel respectively, and the other end of the internal circulation chamber is also connected to the fresh air outlet, and the internal circulation air valve can control the internal circulation air inlet to be opened or closed.

[0016] In some embodiments, a third filter is further provided at the downstream end of the airflow of the internal circulation air inlet.

[0017] A fresh air fan and a heat exchanger are arranged in the internal circulation chamber, and the fresh air outlet leads to the room;

[0018] The internal circulation chamber is also provided with a fresh air temperature and humidity sensor and a carbon dioxide sensor; the fresh air air conditioner also includes an electronic controller.

[0019] In some embodiments, the fresh air fan includes a fresh air motor, a first fresh air volute and a second fresh air volute, and the fresh air motor can be connected to the first fresh air volute and the second fresh air volute at the same time.

[0020] The present invention also provides a control method for a fresh air air conditioner as described in any of the preceding items, comprising:

[0021] Detection steps: detect indoor carbon dioxide concentration C and indoor ambient temperature T 内 and outdoor ambient temperature T 外 ;

[0022] Judgment step: judge the relationship between carbon dioxide concentration C and set concentration A, and judge the indoor environment temperature T 内 With indoor set temperature T 设 and the relationship between the outdoor ambient temperature T 外 and indoor ambient temperature T 内 the relationship between;

[0023] Control steps: According to the relationship between carbon dioxide concentration C and set concentration A, indoor ambient temperature T 内 With indoor set temperature T 设 and the outdoor ambient temperature T 外 and indoor ambient temperature T 内 The relationship between them is used to control the fresh air air conditioner to execute one of the fresh air mode, mixed air mode, internal circulation mode and fresh air bypass mode.

[0024] In some embodiments, when an exhaust fan, a fresh air valve motor, a fresh air bypass valve motor, and an internal circulation air valve are included at the same time:

[0025] In the judgment step, judgment condition 1 is C≥A, and judgment condition 2 is -T1≤T 内 -T 设 ≤T1, judgment condition 3 is -T2≤T 外 -T 内 ≤T2;

[0026] In the control step, if the judgment condition 1 is not met, the exhaust fan and the fresh air valve motor are controlled to be turned off, the fresh air bypass valve motor is turned off, the internal circulation air valve is opened, and the internal circulation mode is operated;

[0027] When it is determined that determination condition 1 is met; and determination condition 2 is not met, control to open the fresh air valve motor, close the fresh air bypass valve motor, open the internal circulation air valve, turn on the exhaust fan, and run the mixed air mode;

[0028] When determination condition 1, determination condition 2, and determination condition 3 are met at the same time, the internal circulation air valve is controlled to be closed, the fresh air air valve motor is closed, the fresh air bypass air valve motor is opened, the exhaust fan is turned on, and the fresh air bypass mode is operated;

[0029] When judgment condition 1 is met, judgment condition 2 is met, and judgment condition 3 is not met, the internal circulation air valve is controlled to be closed, the fresh air air valve motor is turned on, the fresh air bypass air valve motor is turned off, the exhaust fan is turned on, and the fresh air mode is operated;

[0030] Wherein A is the set carbon dioxide concentration value, T1 is the first set temperature value, and T2 is the second set temperature value.

[0031] In some embodiments, A is 900-1100 PPM, T1 is 1° C.-3° C., and T2 is 2° C.-5° C.

[0032] In some embodiments, when a fresh air preheating device is also included:

[0033] The judgment step can also judge whether judgment condition 4 is satisfied: T 环 <T3;

[0034] In the control step, if the judgment condition 4 is met, the fresh air preheating device is turned on; if the judgment condition 4 is not met, the fresh air preheating device 4 is turned off, wherein T 环 is the outdoor ambient temperature, and T3 is the third set temperature.

[0035] The fresh air air conditioner and control method thereof provided by the present invention have the following beneficial effects:

[0036] 1. The present invention can introduce fresh air from the outside into the room through the fresh air inlet and the fresh air outlet provided on the fresh air air conditioner, and can introduce gas from the room and exhaust it to the outside through the exhaust inlet and the exhaust outlet, so as to effectively complete the exchange of fresh air flow and dirty air flow between the indoor and outdoor. In addition, by arranging a heat exchange core, a fresh air channel and a fresh air bypass channel, the outdoor fresh air can exchange heat with the indoor exhaust air through the heat exchange core when entering the fresh air channel. When the temperature difference between the outdoor fresh air and the indoor fresh air is large, the indoor exhaust air can be used to transfer a certain amount of heat or cold to the outdoor fresh air, so as to effectively recover the energy of the indoor exhaust air (mainly heat recovery), and has an energy recovery function, so as to effectively improve the indoor air quality and achieve a good energy-saving effect. The fresh air bypass channel can also pass through the fresh air bypass channel, and the fresh air bypass channel does not exchange heat with the heat exchange core, so that when the temperature difference between the outdoor fresh air and the indoor exhaust air is small, it is not necessary to flow through the heat exchange core for heat exchange, thereby effectively reducing the load when the fresh air heat exchange is not required, reducing the wind resistance, and improving the life of the system.

[0037] 2. The present invention provides an all-in-one fresh air and environmental control machine, which can realize a fresh air mode, a mixed air mode, an internal circulation mode, a fresh air bypass mode, etc. It has functions such as heating, cooling, air purification, fresh air ventilation and bypass, and can adjust different functions according to environmental requirements. It has an energy recovery function, and achieves a good energy-saving effect while effectively improving the indoor air quality. The energy-saving effect is significant, and it can also monitor the indoor temperature and humidity, CO2 concentration, and PM2.5 parameter status in real time, and make effective adjustments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall internal structure of the fresh air air conditioner of the present invention;

[0039] Figure 2 for Figure 1 AA cross section in;

[0040] Figure 3 for Figure 1 BB cross-section diagram in;

[0041] Figure 4 A gas flow diagram of the fresh air air conditioner of the present invention in the fresh air mode;

[0042] Figure 5 A gas flow diagram of the fresh air air conditioner of the present invention in the mixed air mode;

[0043] Figure 6 A gas flow diagram of the fresh air air conditioner of the present invention in the internal circulation mode;

[0044] Figure 7 A gas flow diagram of the fresh air air conditioner of the present invention in the fresh air bypass mode;

[0045] Figure 8 A flow chart of a control method for a fresh air air conditioner of the present invention;

[0046] Fig. 9 Schematic diagram of the overall internal structure of the fresh air air conditioner of the present invention (alternative embodiment 1);

[0047] Fig.10 For the present invention Fig. 9 AA cross-sectional view in (alternative embodiment 1);

[0048] Fig.11 This is an AA screenshot of the second alternative embodiment of the present invention;

[0049] Fig.12 This is a BB screenshot of the second alternative embodiment of the present invention;

[0050] Fig.13 This is an AA screenshot of the third alternative embodiment of the present invention;

[0051] Fig.14 This is a BB screenshot of alternative embodiment 3 of the present invention.

[0052] The reference numerals are:

[0053] 1. Fresh air inlet; 2. First filter; 3. Fresh air filter; 4. Fresh air preheating device; 5. Exhaust air inlet; 6. Second filter; 7. Internal circulation air inlet; 8. Internal circulation air valve; 9. Third filter; 10. Fresh air temperature and humidity sensor; 11. Exhaust air outlet; 12. Exhaust fan; 13. Electronic controller; 14. Heat exchange core; 15. Fresh air valve; 16. Carbon dioxide sensor; 17. Fresh air fan; 18. Heat exchanger; 19. Fresh air outlet; 151. Fresh air valve motor; 152. Fresh air bypass air valve motor; 171. First fresh air volute; 172. Fresh air motor; 173. Second fresh air volute; 100. Fresh air channel; 200. Fresh air bypass channel; 300. Exhaust chamber; 400. Fresh air chamber; 500. Internal circulation chamber. DETAILED DESCRIPTION

[0054] like Figure 1-14 As shown, the present invention provides a fresh air air conditioner, which includes:

[0055] The fresh air inlet 1, the exhaust air inlet 5, the exhaust air outlet 11, the fresh air outlet 19 and the heat exchange core 14, the fresh air channel 100 and the fresh air bypass channel 200. The fresh air inhaled through the fresh air inlet 1 can enter the fresh air channel 100 and exchange heat with the exhaust air entering through the exhaust air inlet 5 at the heat exchange core 14, and the fresh air inhaled through the fresh air inlet 1 can also enter the fresh air bypass channel 200. The airflow in the fresh air bypass channel 200 does not pass through the heat exchange core 14 for heat exchange but directly enters the room through the fresh air outlet 19.

[0056] The present invention can introduce fresh air from the outdoors into the indoors through the fresh air inlet and the fresh air outlet opened on the fresh air air conditioner, and can introduce gas from the indoors and exhaust it to the outdoors through the exhaust inlet and the exhaust outlet, thereby effectively completing the exchange of fresh air flows and dirty air flows between the indoor and outdoor air. In addition, by arranging a heat exchange core, a fresh air channel and a fresh air bypass channel, the outdoor fresh air can exchange heat with the indoor exhaust air through the heat exchange core when entering the fresh air channel. When the temperature difference between the outdoor fresh air and the indoor fresh air is large, the indoor exhaust air can be used to transfer a certain amount of heat or cold to the outdoor fresh air, thereby effectively recovering the energy of the indoor exhaust air (mainly heat recovery), having an energy recovery function, and achieving a good energy-saving effect while effectively improving the indoor air quality. The fresh air can also pass through the fresh air bypass channel, and the fresh air bypass channel does not exchange heat with the heat exchange core. Therefore, when the temperature difference between the outdoor fresh air and the indoor exhaust air is small, the fresh air does not need to flow through the heat exchange core for heat exchange, thereby effectively reducing the load when fresh air heat exchange is not required, reducing wind resistance, and improving the life of the system.

[0057] The present invention provides an all-in-one fresh air and environmental control machine, which can realize a fresh air mode, a mixed air mode, an internal circulation mode, a fresh air bypass mode, etc., and has functions such as heating, cooling, air purification, fresh air ventilation and bypass, and can adjust different functions according to environmental requirements. It has an energy recovery function, and achieves a good energy-saving effect while effectively improving the indoor air quality. The energy-saving effect is significant, and it can also monitor the indoor temperature and humidity, CO2 concentration, and PM2.5 parameter status in real time, and make effective adjustments.

[0058] In some embodiments, an exhaust chamber 300 is further included, the exhaust chamber 300 is communicated with the exhaust inlet 5, and the fresh air channel 100 can be communicated with the fresh air inlet 1, and the heat exchange core 14 is located between the fresh air channel 100 and the exhaust chamber 300, so that the fresh air in the fresh air channel 100 and the exhaust air in the exhaust chamber 300 are heat exchanged at the heat exchange core 14;

[0059] Furthermore, the fresh air bypass channel 200 can also be communicated with the fresh air inlet 1 , and the heat exchange core 14 does not perform heat exchange on the fresh air bypass channel 200 .

[0060] The present invention can also introduce indoor air from the exhaust inlet by setting an exhaust chamber. The fresh air duct is connected with the fresh air inlet to inhale outdoor fresh air. The heat exchange core can enable heat exchange between the fresh air duct and the exhaust chamber. The fresh air bypass channel is connected with the fresh air inlet to inhale fresh air, but the fresh air bypass channel will not allow the airflow to pass through the heat exchange core for heat exchange, thereby effectively reducing wind resistance and improving energy efficiency.

[0061] In some embodiments, the fresh air channel 100 is arranged in the exhaust chamber 300, the fresh air bypass channel 200 is also arranged in the exhaust chamber 300, the fresh air channel 100 is connected to the fresh air bypass channel 200, and the heat exchange core 14 only contacts the fresh air channel 100 for heat exchange; the exhaust outlet 11 is connected to the exhaust chamber 300, and an exhaust fan 12 is also arranged in the exhaust chamber 300. This is a further preferred structural form of the present invention, that is, the fresh air duct is located in the exhaust chamber, the fresh air bypass channel is also located in the exhaust chamber, and the heat exchange core only contacts with the fresh air duct for heat exchange, so that when the temperature difference between indoor and outdoor is large, the indoor exhaust air is used to exchange heat with the outdoor fresh air to recover energy; the heat exchange core is not connected to the fresh air bypass channel to close the fresh air channel when the temperature difference between indoor and outdoor is small, and ventilation is only carried out through the fresh air bypass channel to effectively reduce wind resistance; the exhaust chamber is connected to the exhaust outlet to effectively discharge the indoor air to the outdoors, and the exhaust fan is arranged to open or close the exhaust duct, so that the exhaust chamber is connected to the exhaust inlet or not.

[0062] In some embodiments, a fresh air chamber 400 is further included, and the fresh air chamber 400 is arranged between the fresh air inlet 1 and the fresh air channel 100 or the fresh air bypass channel 200, one end of the fresh air chamber 400 is connected to the fresh air inlet 1, and the other end is connected to the fresh air channel 100 or the fresh air bypass channel 200; and the fresh air filter 3 and the fresh air preheating device 4 are also arranged inside the fresh air chamber 400, and along the air flow direction, the fresh air entering the fresh air inlet 1 can flow through the fresh air filter 3 and the fresh air preheating device 4 in sequence. The present invention can also effectively communicate with the fresh air inlet by setting the fresh air chamber, and transport the fresh air to the fresh air channel or the fresh air bypass channel, and the fresh air filter and the fresh air preheating device in the fresh air chamber can effectively filter and preheat the fresh air, so as to prevent the fresh air blown into the room from causing discomfort to the human body.

[0063] In some embodiments, the fresh air chamber 400 is further provided with a first filter 2, and the first filter 2 is provided between the fresh air filter 3 and the fresh air inlet 1;

[0064] The exhaust air inlet 5 is further provided with a second filter 6 to filter the indoor exhaust air sucked into the exhaust air inlet 5 .

[0065] The present invention can also perform coarse filtering on the fresh air inlet through a first filter and a second filter arranged at the exhaust inlet, thereby blocking large particles and other impurities present in the fresh air entering the room from the outside. The second filter can filter the indoor exhaust air when it enters the exhaust chamber, preventing impurities and the like from entering the exhaust chamber, thereby improving the purity of the indoor exhaust.

[0066] In some embodiments, a fresh air valve 15 is further included, and the fresh air valve 15 can control the fresh air passage 100 to be opened or closed, and the fresh air valve 15 can also control the fresh air bypass passage 200 to be opened or closed;

[0067] The fresh air valve 15 includes a fresh air valve motor 151, a fresh air sweeping blade, a fresh air bypass air valve motor 152 and a fresh air bypass sweeping blade. The fresh air sweeping blade is located in the fresh air duct 100, and the fresh air bypass sweeping blade is located in the fresh air bypass air duct 200. The fresh air valve motor 151 can control the movement of the fresh air sweeping blade to open or close the fresh air channel 100, and the fresh air bypass air valve motor 152 can control the movement of the fresh air bypass sweeping blade to open or close the fresh air bypass channel 200.

[0068] The present invention can also control the opening or closing of the fresh air channel and the opening or closing of the fresh air bypass channel through the setting of the fresh air valve. Preferably, the fresh air valve motor can open or close the fresh air channel, and the fresh air bypass valve motor can open or close the fresh air bypass channel.

[0069] In some embodiments, it further includes an internal circulation chamber 500, an internal circulation air inlet 7 and an internal circulation air valve 8, wherein the internal circulation air inlet 7 is in communication with the internal circulation chamber 500, one end of the internal circulation chamber 500 is also in communication with the fresh air channel 100 and the fresh air bypass channel 200, respectively, and the other end of the internal circulation chamber 500 is also in communication with the fresh air outlet 19, and the internal circulation air valve 8 can control the opening or closing of the internal circulation air inlet 7. The present invention can also introduce indoor airflow into the internal circulation chamber through the internal circulation air inlet through the setting of the internal circulation chamber, and control the opening and closing of the channel through the internal circulation air valve, one end of the internal circulation chamber is in communication with the fresh air channel or the fresh air bypass channel, and can also inhale outdoor fresh air from the fresh air channel or the fresh air bypass channel, and discharge the outdoor fresh air and / or the indoor internal circulation air into the room through the fresh air outlet, effectively completing the role of introducing fresh air into the room and returning the internal circulation air to the room.

[0070] In some embodiments, a third filter 9 is further provided at the downstream end of the airflow of the internal circulation air inlet 7.

[0071] The internal circulation chamber 500 is provided with a fresh air fan 17 and a heat exchanger 18, and the fresh air outlet 19 leads to the room;

[0072] The internal circulation chamber 500 is also provided with a fresh air temperature and humidity sensor 10 and a carbon dioxide sensor 16 ; the fresh air air conditioner also includes an electronic controller 13 .

[0073] The present invention can also filter and purify the air at the inner circulation inlet through the third filter arranged at the inner circulation inlet, and can drive the airflow in the inner circulation chamber through the fresh air fan to drive it into the room through the fresh air outlet, and can also effectively exchange heat for the inner circulation airflow and / or outdoor fresh air through the heat exchanger before entering the room; the temperature and humidity of the indoor wind can be effectively monitored through the fresh air temperature and humidity sensor and the carbon dioxide sensor, and the concentration of carbon dioxide in the indoor airflow can be monitored, so as to control whether to turn on the fresh air, inner circulation air, mixed air, fresh air bypass or fresh air mode according to the temperature, humidity and carbon dioxide concentration of the indoor airflow, so that the indoor temperature, humidity and carbon dioxide concentration can meet the comfort requirements of the human body.

[0074] In some embodiments, the fresh air fan 17 includes a fresh air motor 172, a first fresh air volute 171, and a second fresh air volute 173, and the fresh air motor 172 can be connected to the first fresh air volute 171 and the second fresh air volute 173 at the same time. The present invention also forms a single-motor double-blade drive structure by connecting the fresh air motor to the two volutes, thereby improving the drive effect and having a compact and simple structure.

[0075] The present invention also provides a control method for a fresh air air conditioner as described in any of the preceding items, comprising:

[0076] Detection steps: detect indoor carbon dioxide concentration C and indoor ambient temperature T 内 and outdoor ambient temperature T 外 ;

[0077] Judgment step: judge the relationship between carbon dioxide concentration C and set concentration A, and judge the indoor environment temperature T 内 With indoor set temperature T 设 and the relationship between the outdoor ambient temperature T 外 and indoor ambient temperature T 内 the relationship between;

[0078] Control steps: According to the relationship between carbon dioxide concentration C and set concentration A, indoor ambient temperature T 内 With indoor set temperature T 设and the outdoor ambient temperature T 外 and indoor ambient temperature T 内 The relationship between them is used to control the fresh air air conditioner to execute one of the fresh air mode, mixed air mode, internal circulation mode and fresh air bypass mode.

[0079] The control method of the fresh air air conditioner of the present invention can control the fresh air air conditioner to execute a specific mode according to the carbon dioxide concentration and the indoor ambient temperature and the outdoor ambient temperature, so as to be able to operate any one of the fresh air mode, mixed air mode, internal circulation mode and fresh air bypass mode as needed, and the fresh air heat exchange can recover energy, thereby achieving a good energy-saving effect while effectively improving the indoor air quality; and the fresh air bypass function can reduce the air flow resistance, increase energy, improve the operating energy efficiency of the fresh air air conditioner, and improve efficiency when the indoor and outdoor temperature difference is small without passing through the heat exchange core.

[0080] In some embodiments, when the exhaust fan 12, the fresh air valve motor 151, the fresh air bypass valve motor 152 and the internal circulation air valve 8 are included at the same time:

[0081] In the judgment step, judgment condition 1 is C≥A, and judgment condition 2 is -T1≤T 内 -T 设 ≤T1, judgment condition 3 is -T2≤T 外 -T 内 ≤T2;

[0082] In the control step, if the judgment condition 1 is not met, the exhaust fan 12 and the fresh air valve motor 151 are controlled to be turned off, the fresh air bypass valve motor 152 is turned off, the internal circulation air valve 8 is opened, and the internal circulation mode is operated;

[0083] When it is determined that determination condition 1 is met; and determination condition 2 is not met, the fresh air valve motor 151 is controlled to be opened, the fresh air bypass valve motor 152 is closed, the internal circulation air valve 8 is opened, the exhaust fan 12 is turned on, and the mixed air mode is operated;

[0084] When determination condition 1, determination condition 2, and determination condition 3 are met at the same time, the internal circulation air valve 8 is controlled to be closed, the fresh air air valve motor 151 is closed, the fresh air bypass air valve motor 152 is opened, the exhaust fan 12 is turned on, and the fresh air bypass mode is operated;

[0085] When determination condition 1 is satisfied, determination condition 2 is satisfied, and determination condition 3 is not satisfied, the internal circulation air valve 8 is controlled to be closed, the fresh air air valve motor 151 is turned on, the fresh air bypass air valve motor 152 is turned off, the exhaust fan 12 is turned on, and the fresh air mode is operated;

[0086] Wherein A is the set carbon dioxide concentration value, T1 is the first set temperature value, and T2 is the second set temperature value.

[0087] This fresh air environment control all-in-one machine has fresh air mode, mixed air mode, internal circulation mode and fresh air bypass mode.

[0088] New air mode: Figure 4 As shown, in this mode, the fresh air valve motor 151 controls the air valve to open, the fresh air bypass valve motor 152 controls the air valve to close, and the internal circulation air valve 8 is closed. Outdoor fresh air is introduced through the fresh air inlet 1, purified by the first filter 2 and the fresh air filter 3, and then enters the heat exchange core 14 of the fresh air channel after passing through the fresh air preheating device 4 (open when the outdoor fresh air temperature is too low, preheat the fresh air, and prevent the heat exchange core 14 from freezing), and then the fresh air fan 17 introduces the fresh air into the heat exchanger 18 to complete cooling or heating, and finally enters the room through the fresh air outlet 19. At the same time, indoor air is introduced from the exhaust air inlet 5, filtered by the second filter 6, and then enters the heat exchange core 14, and finally the exhaust fan 12 extracts the indoor air from the exhaust outlet 11 to the outside. When passing through the heat exchange core 14, the outdoor fresh air and the indoor air complete the exchange of heat and humidity, achieving energy saving effect.

[0089] Mixed air mode: Figure 5 As shown, in this mode, the fresh air valve motor 151 controls the air valve to open, the fresh air bypass valve motor 152 controls the air valve to close, and the internal circulation air valve 8 is opened. Outdoor fresh air is introduced through the fresh air inlet 1, purified by the first filter 2 and the fresh air filter 3, and then enters the heat exchange core 14 of the fresh air channel after passing through the fresh air preheating device 4 (which is turned on when the outdoor fresh air temperature is too low to preheat the fresh air and prevent the heat exchange core 14 from freezing). At the same time, indoor air enters through the internal circulation air inlet 7, is filtered by the third filter 9, passes through the internal circulation air valve 8, and is mixed with the clean fresh air entering the fresh air channel. Then, the fresh air fan 17 introduces the fresh air into the heat exchanger 18 to complete cooling or heating, and finally enters the room through the fresh air outlet 19. At the same time, indoor air is introduced from the exhaust inlet 5, filtered by the second filter 6 and then enters the heat exchange core 14, and finally the indoor air is drawn to the outside from the exhaust outlet 11 by the exhaust fan 12. When passing through the heat exchange core 14, the outdoor fresh air and the indoor air complete the exchange of heat and humidity, achieving energy-saving effect.

[0090] Internal circulation mode: Figure 6 As shown, in this mode, the fresh air valve motor 151 controls the air valve to be closed, the fresh air bypass valve motor 152 controls the air valve to be closed, and the internal circulation air valve 8 is opened. At this time, the exhaust fan is turned off, and the indoor air enters through the internal circulation air inlet 7, is filtered by the third filter 9, passes through the internal circulation air valve 8, and then is introduced into the heat exchanger 18 by the fresh air fan 17 to complete cooling or heating, and finally enters the room through the fresh air outlet 19 to complete the internal circulation of the indoor air.

[0091] Fresh air bypass mode: Figure 7 As shown, in this mode, the fresh air valve motor 151 controls the air valve to close, the fresh air bypass air valve motor 152 controls the air valve to open, and the internal circulation air valve 8 is closed. The difference between this mode and the fresh air mode is that the fresh air does not pass through the heat exchange core 14 when entering, but passes through the fresh air bypass hollow structure controlled by the fresh air bypass air valve motor 152. In this mode, the fresh air wind resistance is reduced, the load of the fresh air fan 17 becomes smaller, and it is more energy-saving. At the same time, the fresh air does not pass through the heat exchange core 14, which can extend the service life of the heat exchange core 14.

[0092] The control logic of each operating mode is as follows:

[0093] After starting up, open the internal circulation air valve 8, start the exhaust fan 12, start the fresh air fan 17, and detect the indoor carbon dioxide concentration through the carbon dioxide sensor 16. If the judgment condition 1 is not met, turn off the exhaust fan 12 and run the internal circulation mode; if the judgment condition 1 is met and the judgment condition 2 is not met, turn on the fresh air valve motor 151 and run the mixed air mode; if the judgment conditions 1, 2 and 3 are met at the same time, turn off the internal circulation air valve 8 and run the fresh air bypass mode; if the judgment conditions 1 and 2 are met at the same time and the judgment condition 3 is not met, turn off the internal circulation air valve 8, turn off the fresh air valve motor 151 and turn on the fresh air bypass air valve motor 152 to run the fresh air bypass full air mode. If the judgment condition 4 is met, turn on the fresh air preheating device 4, and if the judgment condition 4 is not met, turn off the fresh air preheating device 4.

[0094] Judgment condition 1: Carbon dioxide concentration ≥ A

[0095] Judgment condition 2: -T1≤indoor ambient temperature -indoor set temperature≤T1

[0096] Judgment condition 3: -T2≤outdoor ambient temperature - indoor ambient temperature≤T2

[0097] Judgment condition 4: Ambient temperature < T

[0098] If the carbon dioxide concentration is too high, it is judged that there is a demand for fresh air. The difference between the ambient temperature and the set temperature is large and there is a need for cooling. Therefore, the need to turn on mixed air is met at the same time, which can effectively reduce the temperature and introduce fresh air.

[0099] If judgment condition 1 is met and judgment condition 2 is not met, it means that the carbon dioxide concentration is high and indoor heat exchange is required, then the mixed air mode is operated;

[0100] If the judgment conditions 1, 2 and 3 are met at the same time, it means that: indoor heat exchange is not required and the temperature difference between indoor and outdoor is small, then the fresh air bypass mode is operated (when the difference between the ambient temperature and the set temperature is small, there is no need for cooling, only fresh air is needed, so there is no need for indoor circulation; at this time, the difference between the indoor ambient temperature and the outdoor ambient temperature is large, and the fresh air in the fresh air mode passes through the core to achieve heat exchange with the exhausted indoor air, thereby achieving energy saving.)

[0101] If both judgment conditions 1 and 2 are met, but judgment condition 3 is not met, it means that: indoor heat exchange is not required, and if condition 3 is not met, it means that the temperature difference between outdoor and indoor is large, and fresh air heat exchange is required (when the difference between the ambient temperature and the set temperature is small, there is no need for cooling, only fresh air is needed, so indoor circulation is not required; at this time, the difference between the indoor ambient temperature and the outdoor ambient temperature is small, and heat exchange is not meaningful, so the fresh air bypass mode needs to be turned on.)

[0102] Where: A is the set carbon dioxide concentration value, ranging from 900-1100PPM

[0103] T1 is the set temperature value, ranging from 1℃ to 3℃

[0104] T2 is the set temperature value, ranging from 2℃ to 5℃

[0105] T is the set temperature value, ranging from -30℃ to 0℃

[0106] In some embodiments, A is 900-1100 PPM, T1 is 1° C.-3° C., and T2 is 2° C.-5° C.

[0107] In some embodiments, when a fresh air preheating device 4 is also included:

[0108] The judgment step can also judge whether judgment condition 4 is satisfied: T 环 <T3;

[0109] In the control step, if the judgment condition 4 is met, the fresh air preheating device 4 is turned on, and if the judgment condition 4 is not met, the fresh air preheating device 4 is turned off, wherein T ring is the ambient temperature and T3 is the third set temperature. When the outdoor fresh air temperature is too low, the core will freeze and damage the core, so the fresh air preheating device is required for preheating.

[0110] Alternative implementation method 1, such as Figure 9-10 ,

[0111] The hexagonal heat exchange core 14 can be replaced by a square or a rhombus.

[0112] like Fig. 9As shown, the lower end of the AA partial cross-sectional view is the heat exchange core 14, which belongs to the fresh air channel; the upper end is a hollow structure, which belongs to the fresh air bypass channel. In the BB partial cross-sectional view, the fresh air bypass air valve motor controls the fresh air bypass channel to discharge air, and the fresh air valve motor controls the fresh air channel to discharge air.

[0113] Alternative implementation method 2, such as Figure 11-14 ,

[0114] The fresh air bypass channel and the fresh air channel can also be arranged to be placed on the left and right, with the heat exchange core serving as the fresh air channel; and another fresh air bypass channel is arranged.

[0115] like Fig.11 As shown, the right end of the AA partial cross-sectional view is the heat exchange core 14, which belongs to the fresh air channel; the left end is a hollow structure, which belongs to the fresh air bypass channel. Corresponding air valves are set at the channel ports. In the BB partial cross-sectional view, the fresh air valve motor 151 controls the fresh air channel to discharge air, and the fresh air bypass valve motor 152 controls the fresh air bypass channel to discharge air.

[0116] like Fig.13 As shown in the AA partial cross-sectional view, the left end is the heat exchange core 14, the fresh air bypass channel; the right end is a hollow structure, which belongs to the fresh air channel. Corresponding air valves are set at the channel ports, such as Fig.14 As shown, in the BB partial cross-sectional view, the fresh air valve motor 151 controls the air outlet of the fresh air channel, and the fresh air bypass valve motor 152 controls the air outlet of the fresh air bypass channel.

[0117] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A fresh air air conditioner, characterized in that: include: A fresh air inlet (1), an exhaust air inlet (5), an exhaust air outlet (11), a fresh air outlet (19), a heat exchange core (14), a fresh air channel (100), and a fresh air bypass channel (200); fresh air sucked in through the fresh air inlet (1) can enter the fresh air channel (100) and exchange heat with exhaust air entering through the exhaust air inlet (5) at the heat exchange core (14); fresh air sucked in through the fresh air inlet (1) can also enter the fresh air bypass channel (200); airflow in the fresh air bypass channel (200) does not pass through the heat exchange core (14) for heat exchange but directly enters the room through the fresh air outlet (19); It also comprises an exhaust chamber (300), the exhaust chamber (300) being in communication with the exhaust inlet (5), and the fresh air channel (100) being in communication with the fresh air inlet (1), and the heat exchange core (14) being located between the fresh air channel (100) and the exhaust chamber (300), so that the fresh air in the fresh air channel (100) and the exhaust air in the exhaust chamber (300) can exchange heat at the heat exchange core (14); Furthermore, the fresh air bypass channel (200) can also be in communication with the fresh air inlet (1), and the heat exchange core (14) does not perform heat exchange on the fresh air bypass channel (200); It also comprises a fresh air chamber (400), the fresh air chamber (400) being arranged in communication between the fresh air inlet (1) and the fresh air channel (100) or the fresh air bypass channel (200), one end of the fresh air chamber (400) being in communication with the fresh air inlet (1), and the other end being in communication with the fresh air channel (100) or the fresh air bypass channel (200); and a fresh air filter (3) and a fresh air preheating device (4) are also arranged inside the fresh air chamber (400), and along the air flow direction, the fresh air entering the fresh air inlet (1) can flow through the fresh air filter (3) and the fresh air preheating device (4) in sequence; The invention also includes an internal circulation chamber (500), an internal circulation air inlet (7) and an internal circulation air valve (8); the internal circulation air inlet (7) is connected to the internal circulation chamber (500); one end of the internal circulation chamber (500) is also connected to the fresh air channel (100) and the fresh air bypass channel (200) respectively; and the other end of the internal circulation chamber (500) is also connected to the fresh air outlet (19); and the internal circulation air valve (8) can control the opening or closing of the internal circulation air inlet (7).

2. The fresh air air conditioner according to claim 1, characterized in that: The fresh air channel (100) is arranged in the exhaust chamber (300), and the fresh air bypass channel (200) is also arranged in the exhaust chamber (300); the fresh air channel (100) is connected to the fresh air bypass channel (200), and the heat exchange core (14) only contacts with the fresh air channel (100) for heat exchange; the exhaust outlet (11) is connected to the exhaust chamber (300), and an exhaust fan (12) is also arranged in the exhaust chamber (300).

3. The fresh air air conditioner according to claim 1, characterized in that: A first filter (2) is also provided in the fresh air chamber (400), and the first filter (2) is provided between the fresh air filter (3) and the fresh air inlet (1); A second filter (6) is also provided at the exhaust air inlet (5) to filter the indoor exhaust air sucked into the exhaust air inlet (5).

4. The fresh air air conditioner according to any one of claims 1 to 3, characterized in that: It also comprises a fresh air valve (15), wherein the fresh air valve (15) is capable of controlling the fresh air passage (100) to be opened or closed, and the fresh air valve (15) is also capable of controlling the fresh air bypass passage (200) to be opened or closed; The fresh air valve (15) comprises a fresh air valve motor (151), a fresh air sweeping blade, a fresh air bypass air valve motor (152) and a fresh air bypass sweeping blade, the fresh air sweeping blade being located in the fresh air channel (100), the fresh air bypass sweeping blade being located in the fresh air bypass channel (200), the fresh air valve motor (151) being capable of controlling the movement of the fresh air sweeping blade to open or close the fresh air channel (100), and the fresh air bypass air valve motor (152) being capable of controlling the movement of the fresh air bypass sweeping blade to open or close the fresh air bypass channel (200).

5. The fresh air air conditioner according to claim 1, characterized in that: A third filter (9) is also provided at the downstream end of the airflow of the internal circulation air inlet (7). A fresh air fan (17) and a heat exchanger (18) are provided in the internal circulation chamber (500), and the fresh air outlet (19) leads to the room; A fresh air temperature and humidity sensor (10) and a carbon dioxide sensor (16) are also provided in the internal circulation chamber (500); the fresh air air conditioner also includes an electronic controller (13).

6. The fresh air air conditioner according to claim 5, characterized in that: The fresh air fan (17) comprises a fresh air motor (172), a first fresh air volute (171) and a second fresh air volute (173); the fresh air motor (172) can be connected to the first fresh air volute (171) and the second fresh air volute (173) at the same time.

7. A control method for a fresh air air conditioner according to any one of claims 1 to 6, characterized in that: include: Detection steps: detect indoor carbon dioxide concentration C and indoor ambient temperature T 内 and outdoor ambient temperature T 外 ; Judgment step: judge the relationship between carbon dioxide concentration C and set concentration A, and judge the indoor environment temperature T 内 With indoor set temperature T 设 and the relationship between the outdoor ambient temperature T 外 and indoor ambient temperature T 内 the relationship between; Control steps: According to the relationship between carbon dioxide concentration C and set concentration A, indoor ambient temperature T 内 With indoor set temperature T 设 and the outdoor ambient temperature T 外 and indoor ambient temperature T 内 The relationship between them is used to control the fresh air air conditioner to execute one of the fresh air mode, mixed air mode, internal circulation mode and fresh air bypass mode.

8. The control method according to claim 7, characterized in that: When the exhaust fan (12), the fresh air valve motor (151), the fresh air bypass valve motor (152) and the internal circulation air valve (8) are included at the same time: In the judgment step, judgment condition 1 is C≥A, and judgment condition 2 is -T1≤T 内 -T 设 ≤T1, judgment condition 3 is -T2≤T 外 -T 内 ≤T2; In the control step, if the judgment condition 1 is not met, the exhaust fan (12) and the fresh air valve motor (151) are controlled to be turned off, the fresh air bypass valve motor (152) is turned off, the internal circulation air valve (8) is opened, and the internal circulation mode is operated; When it is determined that determination condition 1 is satisfied, and determination condition 2 is not satisfied, the fresh air valve motor (151) is controlled to be opened, the fresh air bypass valve motor (152) is closed, the internal circulation air valve (8) is opened, the exhaust fan (12) is turned on, and the mixed air mode is operated; When determination condition 1, determination condition 2, and determination condition 3 are simultaneously satisfied, the internal circulation air valve (8) is controlled to be closed, the fresh air air valve motor (151) is closed, the fresh air bypass air valve motor (152) is opened, the exhaust fan (12) is opened, and the fresh air bypass mode is operated; When determination condition 1 is satisfied, determination condition 2 is satisfied, and determination condition 3 is not satisfied, the internal circulation air valve (8) is controlled to be closed, the fresh air air valve motor (151) is turned on, the fresh air bypass air valve motor (152) is turned off, the exhaust fan (12) is turned on, and the fresh air mode is operated; Wherein A is the set carbon dioxide concentration value, T1 is the first set temperature value, and T2 is the second set temperature value.

9. The control method according to claim 8, characterized in that: The value of A is 900-1100PPM, the value of T1 is 1℃-3℃, and the value of T2 is 2℃-5℃.

10. The control method according to claim 8, characterized in that: When the fresh air preheating device (4) is also included: The judgment step can also judge whether judgment condition 4 is satisfied: T 环 <T3; In the control step, if the judgment condition 4 is met, the fresh air preheating device (4) is turned on; if the judgment condition 4 is not met, the fresh air preheating device 4 is turned off, wherein T 环 is the ambient temperature, and T3 is the third set temperature.

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