Combined air conditioning unit and control method thereof

Abstract

The invention relates to the technical field of air treatment equipment, in particular to a combined air conditioning unit and a control method thereof. The combined air conditioning unit comprises a fresh air channel, an exhaust channel, an exhaust valve and an air return valve. An exhaust fan is arranged in the exhaust channel and used for enabling indoor air to enter the exhaust channel. The return air valve is used for controlling the return air quantity entering the fresh air channel from the exhaust channel, and the exhaust valve is used for controlling the exhaust air quantity flowing out of the room from the exhaust channel; an air feeder is arranged in the fresh air channel and used for feeding air in the fresh air channel into a room. The control method comprises the steps that the target exhaust air rate is obtained; the opening degree of the air return valve and the opening degree of the air exhaust valve are controlled according to the target air exhaust rate; the exhaust fan and the air feeder work at the same time, and the total exhaust air rate of the exhaust fan is equal to the air supply rate of the air feeder. By the adoption of the exhaust fan, the exhaust fan can always maintain high-frequency operation under the transition season working condition and the winter and summer working condition, and the purposes of prolonging the service life of equipment and reducing noise and vibration are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air treatment equipment, and in particular to a combined air conditioning unit and a control method thereof. Background Art

[0002] Currently, modular air conditioning units with heat recovery include a fresh air duct and an exhaust duct. The fresh air duct has a fresh air inlet at one end that connects to the outdoors, and an air supply outlet at the other end that connects to the indoors. A fresh air valve is installed at the fresh air inlet, and a blower is installed at the air supply outlet. The exhaust duct has an air inlet at one end that connects to the indoors, and an exhaust outlet at the other end that connects to the outdoors. The exhaust fan is installed at the exhaust outlet to exhaust the air in the duct to the outdoors.

[0003] As the country's requirements for building energy conservation increase, heat recovery combined air conditioning units usually need to increase the fresh air volume during the transition season, rely on natural wind for cooling, and reduce the energy consumption of the rotor and main unit. As the fresh air volume increases, the exhaust volume also needs to increase accordingly. In order to meet the air volume adjustment, the exhaust fan needs to be selected according to the maximum exhaust volume during the transition season, and frequency conversion should be considered at the same time. Therefore, the exhaust fan is a variable frequency fan controlled on demand. At present, the exhaust volume of the exhaust outlet is mainly adjusted by adjusting the frequency of the exhaust fan. For example, in the transition season, the exhaust fan is 20,000m 3 / h air volume operation, air conditioning seasonal exhaust fan is 6000m 3 / h air volume operation. That is to say, the exhaust fan runs at a high frequency in the transition season, and runs at a low frequency for a long time in the air-conditioning season (winter or summer).

[0004] However, the low-frequency operation of the exhaust fan can easily cause the following hazards:

[0005] When exhaust fans operate at low frequency, the inverter frequency drops due to factors such as sudden load drops or insufficient grid capacity, reducing motor power. This can cause fluctuations in the voltage and current of the equipment, which can lead to severe problems such as excessive motor temperature rise, insulation damage, bearing wear, and wire aging. Therefore, long-term low-frequency operation of exhaust fans accelerates equipment wear.

[0006] When exhaust fans operate at low frequencies, the reduced load causes changes in rotor forces, which can cause magnetic flux fluctuations, core vibration, and gear transmission noise, generating noise. This noise primarily manifests as aerodynamic noise and mechanical noise. Therefore, in addition to considering aerodynamic noise, it's also necessary to consider the mechanical noise caused by low-frequency fan operation.

[0007] Low-frequency operation of the fan places additional load on the motor, which in turn exacerbates vibration. During operation, vibration can cause displacement of the base and deformation of the fan hub. This not only damages the equipment but also significantly impacts the surrounding environment. Summary of the Invention

[0008] In view of the above problems, the present invention is proposed to provide a combined air-conditioning unit and its control method that overcome the above problems or at least partially solve the above problems, aiming to solve the problem that the exhaust fan in the existing combined air-conditioning unit is in a low-frequency operation state for a long time during the air-conditioning season, so as to achieve the purpose of increasing the service life of the equipment and reducing noise and vibration.

[0009] In one aspect, the present invention provides a control method for a combined air conditioning unit, the combined air conditioning unit comprising a fresh air duct, an exhaust air duct, an exhaust valve, and a return air valve; an exhaust fan is provided in the exhaust air duct for introducing indoor air into the exhaust air duct; the return air valve is used to control the amount of return air from the exhaust air duct into the fresh air duct, and the exhaust valve is used to control the amount of exhaust air from the exhaust air duct flowing out of the room; a supply fan is provided in the fresh air duct for delivering air in the fresh air duct into the room;

[0010] The control method includes:

[0011] Obtain target exhaust volume;

[0012] controlling the openings of the return air valve and the exhaust air valve according to the target exhaust air volume;

[0013] The exhaust fan and the supply fan are operated simultaneously, and the total exhaust volume of the exhaust fan is equal to the supply volume of the supply fan.

[0014] Optionally, the exhaust fan is a variable frequency fan, so that the operating frequency of the exhaust fan is higher than the corresponding operating frequency of the exhaust fan when delivering the target exhaust volume.

[0015] Optionally, the exhaust fan is a constant speed motor.

[0016] Optionally, the target exhaust volume includes at least a first exhaust volume and a second exhaust volume, and the first exhaust volume is greater than the second exhaust volume;

[0017] Controlling at least the openings of the return air valve and the exhaust air valve according to the target exhaust air volume includes:

[0018] When the target exhaust volume is a first exhaust volume, controlling the return air valve to perform a first opening, and controlling the exhaust valve to perform a first preset opening;

[0019] When the target exhaust volume is a second exhaust volume, controlling the return air valve to perform a second opening, and controlling the exhaust valve to perform a second preset opening;

[0020] The first opening is smaller than the second opening, and the first preset opening is larger than the second preset opening.

[0021] Optionally, obtaining a target exhaust volume includes:

[0022] Get the context of the outdoor space;

[0023] The target exhaust volume is obtained according to the environment of the outdoor space.

[0024] Optionally, obtaining the target exhaust volume according to the environment of the outdoor space includes:

[0025] When the outdoor space environment is in a transitional season condition, the target exhaust volume is a first exhaust volume;

[0026] When the outdoor space environment is winter or summer working conditions, the target exhaust volume is the second exhaust volume;

[0027] Wherein, the first exhaust volume is greater than the second exhaust volume.

[0028] Optionally, obtaining a target exhaust volume includes:

[0029] Obtain target fresh air volume;

[0030] The target exhaust air volume is obtained according to the target fresh air volume.

[0031] Optionally, the combined air-conditioning unit further comprises a rotor, and bypass channels are provided on both upper and lower sides of the rotor, and a bypass control valve is provided in the bypass channel;

[0032] The control method further includes:

[0033] When the environment of the outdoor space is in a transitional season operating condition, controlling the runner to stop and controlling the bypass control valve to open;

[0034] When the environment of the outdoor space is winter or summer working conditions, the rotor is controlled to start and stop in conjunction with the blower, and the bypass control valve is controlled to close.

[0035] Optionally, the combined air conditioning unit further includes a surface cooler;

[0036] The control method further includes:

[0037] Obtaining the return air temperature in the exhaust duct;

[0038] According to the return air temperature and the target temperature, the water inlet and outlet of the surface cooler are controlled to adjust the indoor temperature.

[0039] The present invention also provides a combined air-conditioning unit, including a controller, the controller including a memory and a processor, the memory storing a control program, and the control program, when executed by the processor, is used to implement a control method for the combined air-conditioning unit as described in any one of the above.

[0040] In the combined air-conditioning unit and the control method thereof of the present invention, during the operation of the combined air-conditioning unit, the total exhaust volume of the exhaust fan is always equal to the supply volume of the supply fan, and the exhaust volume is the difference between the total exhaust volume of the exhaust fan and the return air volume. The present invention can achieve the target exhaust volume only by adjusting the opening of the return air valve and the exhaust valve. The present invention overcomes technical prejudice. In the present invention, the exhaust fan is not controlled according to the target exhaust volume, and the exhaust fan can be operated at a cross-air volume. Therefore, by adopting the combined air-conditioning unit and the control method thereof of the present invention, the exhaust fan can always maintain high-frequency operation during transitional seasonal working conditions and winter and summer working conditions, avoiding the problem in the prior art that the exhaust fan is in a low-frequency operating state for a long time during the air-conditioning season, thereby achieving the purpose of increasing the service life of the equipment and reducing noise and vibration.

[0041] In addition, the control method of the present invention has the beneficial effect that the control procedure is simple and easy to execute.

[0042] Therefore, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0044] Figure 1 is a schematic flow chart of a control method for a combined air conditioning unit according to one embodiment of the present invention;

[0045] Figure 2 is a schematic flow chart of a control method for a combined air conditioning unit according to one embodiment of the present invention;

[0046] Figure 3 is a schematic flow chart of a control method for a combined air conditioning unit according to one embodiment of the present invention;

[0047] Figure 4 is a schematic flow chart of a control method for a combined air conditioning unit according to one embodiment of the present invention;

[0048] Figure 5 is a schematic flow chart of a control method for a combined air conditioning unit according to one embodiment of the present invention;

[0049] Figure 6 is a schematic flow chart of a control method for a combined air conditioning unit according to one embodiment of the present invention;

[0050] Figure 7 is a schematic flow chart of a control method for a combined air conditioning unit according to one embodiment of the present invention;

[0051] Figure 8 is a schematic structural diagram of a combined air-conditioning unit according to one embodiment of the present invention;

[0052] Figure 9 1 is a schematic structural diagram of a controller in a combined air-conditioning unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0053] Refer to the following Figures 1 to 9 The combined air conditioning unit and control method thereof according to an embodiment of the present invention will be described. The directions or positional relationships indicated by terms such as "front," "rear," "up," "down," "top," "bottom," "inside," "outside," and "lateral" are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on the present invention.

[0054] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the definition of "first", "second", etc. can explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or more of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0055] Unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," "coupled," and the like should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise specified. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0056] Figure 1is a schematic flow chart of a control method for a combined air conditioning unit according to an embodiment of the present invention, and Figure 2-9 , the present invention provides a control method for a combined air-conditioning unit.

[0057] The combined air conditioning unit includes a fresh air duct 10, an exhaust duct 20, an exhaust valve 22, and a return air valve 30. An exhaust fan 21 is located within the exhaust duct 20, drawing indoor air into the duct. The return air valve 30 controls the amount of return air from the exhaust duct 20 into the fresh air duct 10. The exhaust valve 22 controls the amount of exhaust air flowing from the exhaust duct 20 out of the room. A supply air fan 11 is located within the fresh air duct 10, drawing air from the duct 10 into the room.

[0058] like Figure 1 As shown, a control method for a combined air conditioning unit includes the following steps:

[0059] Step S100: obtaining a target exhaust volume.

[0060] Step S200: Control the openings of the return air valve 30 and the exhaust air valve 22 according to the target exhaust air volume.

[0061] In step S300 , the exhaust fan 21 and the supply fan 11 are operated simultaneously, and the total exhaust volume of the exhaust fan 21 is equal to the supply volume of the supply fan 11 .

[0062] The working process of the combined air conditioning unit is as follows: under the action of the exhaust fan 21, after the indoor air enters the exhaust duct 20, part of it is discharged to the outside, and the other part enters the fresh air duct 10. Among them, the indoor air entering the fresh air duct 10 from the exhaust duct 20 is the return air. Under the action of the supply fan 11, the outdoor fresh air and return air enter the room through the fresh air duct 10. During the operation of the combined air conditioning unit, the total exhaust volume of the exhaust fan 21 is equal to the sum of the return air volume and the exhaust volume, and the supply air volume of the supply fan 11 is equal to the sum of the fresh air volume and the return air volume. The exhaust volume and the fresh air volume are equal. The total exhaust volume of the exhaust fan 21 is always equal to the supply air volume of the supply fan 11. The return air volume and the exhaust air volume can be adjusted by adjusting the opening of the return air valve 30 and the exhaust valve 22.

[0063] In this embodiment, during the operation of the combined air-conditioning unit, the total exhaust volume of the exhaust fan is always equal to the supply volume of the supply fan, and the exhaust volume is the difference between the total exhaust volume of the exhaust fan and the return air volume. The present invention can achieve the target exhaust volume only by adjusting the opening of the return air valve and the exhaust valve. The present invention overcomes technical prejudice. In the present invention, the exhaust fan is not controlled according to the target exhaust volume, and the exhaust fan can be operated at a cross-air volume. Therefore, by adopting the combined air-conditioning unit and the control method thereof of the present invention, the exhaust fan can always maintain high-frequency operation during transitional seasonal conditions and winter and summer conditions, avoiding the problem in the prior art that the exhaust fan is in a low-frequency operation state for a long time during the air-conditioning season, thereby achieving the purpose of increasing the service life of the equipment and reducing noise and vibration.

[0064] Furthermore, the present invention can reasonably and effectively adjust the air volume of the unit to ensure stable operation of the unit.

[0065] In some optional embodiments of the present invention, one end of the fresh air channel 10 is a fresh air outlet 13, and the other end is an air supply outlet 14. One end of the exhaust channel 20 is an exhaust outlet 24, and the other end is an air inlet 23.

[0066] In some optional embodiments of the present invention, the exhaust valve 22 is located at the exhaust port of the exhaust passage 20. In some alternative embodiments, the exhaust valve 22 is located in the exhaust passage 20 and close to the exhaust port.

[0067] In some optional embodiments of the present invention, the exhaust fan 21 is disposed between the exhaust valve 22 and the air inlet 23 of the exhaust channel 20 .

[0068] In some optional embodiments of the present invention, the fresh air valve 12 is located at the fresh air inlet 13 of the fresh air channel 10. In some alternative embodiments, the fresh air valve 12 is located in the fresh air channel 10 and close to the fresh air inlet 13.

[0069] In some optional embodiments of the present invention, the blower 11 is located at the air outlet 14 of the fresh air passage 10. In some alternative embodiments, the blower 11 is located in the fresh air passage 10 and near the air outlet 14.

[0070] In some optional embodiments of the invention, the exhaust fan 21 is a variable frequency fan, so that the operating frequency of the exhaust fan 21 is higher than the corresponding operating frequency of the exhaust fan 21 when delivering the target exhaust volume.

[0071] That is to say, when the exhaust fan 21 is a variable frequency fan, since the operating frequency of the exhaust fan 21 is higher than the corresponding operating frequency of the exhaust fan 21 when delivering the target exhaust volume, the operating frequency of the exhaust fan 21 is always high frequency during transition season conditions and winter and summer conditions, avoiding the problem in the prior art that the exhaust fan 21 is in a low-frequency operation state for a long time during the air-conditioning season, thereby achieving the purpose of increasing the service life of the equipment and reducing noise and vibration.

[0072] Furthermore, a step-down motor is also a type of variable frequency motor. A step-down fan refers to a fan with multiple working gears, and the higher the gear, the higher the frequency.

[0073] In some optional embodiments of the present invention, the exhaust fan 21 is a constant speed motor, which is a single speed motor or a fixed frequency motor.

[0074] In some optional embodiments of the present invention, the blower 11 operates at a constant air volume.

[0075] In this embodiment, since the exhaust fan 21 is a constant speed motor, it is selected according to the total value of the exhaust volume and the return air volume. For example, the exhaust fan 21 is selected according to 20000m 3 / h air volume selection. During transitional seasons and winter and summer operating conditions, the total exhaust volume of the exhaust fan 21 remains unchanged and is always high-frequency, avoiding the problem of the exhaust fan in the prior art operating at a low frequency for a long time during the air-conditioning season, thereby achieving the purpose of extending the service life of the equipment and reducing noise and vibration.

[0076] In some optional embodiments of the present invention, the target exhaust volume includes at least a first exhaust volume and a second exhaust volume, and the first exhaust volume is greater than the second exhaust volume.

[0077] like Figure 2 As shown, step S200, controlling the opening of at least the return air valve 30 and the exhaust air valve 22 according to the target exhaust volume, includes the following steps:

[0078] Step S201 : When the target exhaust air volume is a first exhaust air volume, the return air valve 30 is controlled to have a first opening, and the exhaust air valve 22 is controlled to have a first preset opening.

[0079] Step S202 : When the target exhaust air volume is the second exhaust air volume, the return air valve 30 is controlled to open at a second degree, and the exhaust air valve 22 is controlled to open at a second preset degree.

[0080] The first opening is smaller than the second opening, and the first preset opening is larger than the second preset opening.

[0081] Specifically, when the target exhaust volume increases, the exhaust valve 22 opening is increased and the return valve 30 opening is decreased to increase the exhaust volume and decrease the return volume. When the target exhaust volume decreases, the exhaust valve 22 opening is decreased and the return valve 30 opening is increased to decrease the exhaust volume and increase the return volume.

[0082] Therefore, through the above specific method, the exhaust fan 21 can always maintain high-frequency operation.

[0083] like Figure 3As shown, in some optional embodiments of the present invention, step S100, obtaining the target exhaust volume, includes the following specific steps:

[0084] Step S101: Acquire the environment of the outdoor space.

[0085] Step S102: obtaining a target exhaust volume according to the environment of the outdoor space.

[0086] This embodiment provides a specific method for obtaining the target exhaust volume. The method has the advantages of being simple, easy to operate and highly accurate, thereby facilitating precise control of the combined air-conditioning unit to better meet the usage needs of customers.

[0087] like Figure 4 As shown, in some optional embodiments of the present invention, step S102, obtaining a target exhaust volume according to the environment of the outdoor space, includes:

[0088] Step S1021: When the outdoor environment is in a transitional season condition, the target exhaust volume is a first exhaust volume.

[0089] Step S1022: When the outdoor space environment is winter or summer, the target exhaust volume is the second exhaust volume.

[0090] The first exhaust air volume is greater than the second exhaust air volume.

[0091] In some optional embodiments of the present invention, step S101, obtaining the environment of the outdoor space, includes: obtaining the environment of the outdoor space according to at least one of a user's selection instruction, a weather forecast, a temperature sensor, and a wind speed sensor.

[0092] The user's selection instructions include transition season conditions and winter and summer conditions.

[0093] like Figure 5 As shown, in some optional embodiments of the present invention,

[0094] Step S100, obtaining a target exhaust volume, includes the following steps:

[0095] Step S103: Obtain target fresh air volume.

[0096] Step S104: Obtain the target exhaust air volume according to the target fresh air volume.

[0097] Since the target exhaust volume and the target fresh air volume are equal, the target exhaust volume can be obtained based on the target fresh air volume.

[0098] This embodiment provides a specific method for obtaining a target exhaust volume. This method has the advantages of being simple, easy to operate, and highly accurate, thereby facilitating precise control of a combined air-conditioning unit.

[0099] Furthermore, in some optional embodiments of the present invention, the target fresh air volume includes at least a first fresh air volume and a second fresh air volume, and the first fresh air volume is greater than the second fresh air volume.

[0100] Step S104, obtaining a target exhaust air volume according to the target fresh air volume, includes:

[0101] Step S1041: When the target fresh air volume is the first fresh air volume, the target exhaust air volume is the first exhaust air volume.

[0102] Step S1042: When the target fresh air volume is the second fresh air volume, the target exhaust air volume is the second exhaust air volume.

[0103] The first exhaust air volume is greater than the second exhaust air volume.

[0104] In some optional embodiments of the present invention, a fresh air valve 12 is provided in the air supply channel for controlling the amount of fresh air entering the fresh air channel 10 from outdoor fresh air.

[0105] A control method for a combined air conditioning unit further includes the following steps:

[0106] Step S300: Control the opening of the fresh air valve 12 according to the target fresh air volume.

[0107] Step S300 specifically includes the following steps:

[0108] Step S301 : When the target fresh air volume is a first fresh air volume, the fresh air valve 12 is controlled to execute a first preset value.

[0109] Step S302: When the target fresh air volume is the second fresh air volume, the fresh air valve 12 is controlled to execute the second preset value.

[0110] Among them, the first preset value is greater than the second preset value, and the first fresh air volume is greater than the second fresh air volume.

[0111] In some optional embodiments of the present invention, step S103, obtaining the target fresh air volume, includes the following steps:

[0112] Step S1031: Acquire the environment of the outdoor space.

[0113] Step S1031: Obtain target fresh air volume according to the environment of the outdoor space.

[0114] When the outdoor environment is in transitional season conditions, the target fresh air volume is the first fresh air volume.

[0115] When the outdoor space environment is winter and summer working conditions, the target fresh air volume is the second fresh air volume.

[0116] Among them, the first fresh air volume is greater than the second fresh air volume.

[0117] In some optional embodiments of the present invention, Figure 8 As shown, the combined air-conditioning unit further includes a rotor 40, a portion of which is located in the fresh air duct 10, and the other portion is located in the exhaust duct 20. Bypass channels are provided on the upper and lower sides of the rotor 40, and a bypass control valve is provided in the bypass channel.

[0118] like Figure 6 As shown, the control method of the combined air-conditioning unit further includes the following steps:

[0119] Step S401 : When the outdoor environment is in a transitional season condition, the runner 40 is controlled to stop, and the bypass control valve is controlled to open.

[0120] Step S402 , when the outdoor space environment is winter or summer working conditions, the runner 40 is controlled to start and stop in conjunction with the blower 11 , and the bypass control valve is controlled to be closed.

[0121] Specifically, the rotor is a rotary heat exchanger. A rotary heat exchanger consists of a honeycomb heat storage wheel, a housing, a power drive mechanism, and seals. The lower portion of the rotor 40 is located within the fresh air duct 10, while the upper portion of the rotor 40 is located within the exhaust duct 20. Fresh air and exhaust air generally flow in opposite directions. When the rotor's heat storage core begins to rotate, the fresh air and exhaust air simultaneously pass through each side of the rotor, exchanging heat and cold air between the exhaust and fresh air. In other words, the rotor functions to exchange heat between fresh air and exhaust air. The bypass channel located on the lower side of the rotor is the first bypass channel, and the bypass channel located on the upper side of the rotor is the second bypass channel. The inlet of the first bypass channel communicates with the fresh air inlet 13 of the fresh air duct 10, and the outlet of the first bypass channel communicates with the air supply port 14 of the fresh air duct 10. The inlet of the second bypass channel communicates with the air inlet 23 of the exhaust duct 20, and the outlet of the second bypass channel communicates with the exhaust port of the exhaust duct 20. That is to say, the inlet and outlet of the bypass air duct are respectively located on the left and right sides of the runner.

[0122] During transition seasons, due to the large exhaust and fresh air volumes, the runner is controlled to shut down and the bypass control valve is controlled to open, which can reduce the wind resistance in the fresh air channel and the exhaust duct, thereby reducing the overall energy consumption of the system and playing a role in energy conservation and emission reduction.

[0123] In some optional embodiments of the present invention, the combined air conditioning unit further includes a surface cooler.

[0124] like Figure 7 As shown, the control method of the combined air-conditioning unit further includes the following steps:

[0125] Step S500 , obtaining the return air temperature in the exhaust duct 20 .

[0126] Step S600: Control the water flow rate of the condenser according to the return air temperature and the target temperature to adjust the indoor temperature.

[0127] Specifically, the surface cooler is disposed in the fresh air passage 10 for cooling the fresh air. "Controlling the water inlet and outlet of the surface cooler" refers to adjusting the opening of the water valve of the surface cooler.

[0128] This embodiment provides a specific method for regulating indoor temperature by controlling the water flow in and out of the condenser. Therefore, with this embodiment, there is no need to adjust the indoor temperature by adjusting the exhaust fan 21 or the supply fan 11, allowing the exhaust fan 21 and the supply fan 11 to operate at a constant air volume.

[0129] In some optional embodiments of the present invention, a first air volume sensor is provided in the fresh air duct 10 .

[0130] In this embodiment, by providing a first air volume sensor, it is convenient to detect whether the actual fresh air volume meets the preset requirements, thereby facilitating more accurate adjustment of the opening of the fresh air valve.

[0131] In some optional embodiments of the present invention, a second air volume sensor is provided in the exhaust passage 20 .

[0132] In this embodiment, by providing a second air volume sensor, it is convenient to detect whether the actual exhaust air volume is sufficient to meet the preset requirements, thereby facilitating more accurate adjustment of the openings of the return air valve and the exhaust valve.

[0133] In this embodiment, by providing a first air volume sensor, it is convenient to detect whether the actual fresh air volume meets the preset requirements.

[0134] like Figure 9 The present invention further provides a modular air conditioning unit. The modular air conditioning unit includes a controller 500, which includes a memory 520 and a processor 510. The memory 520 stores a control program 521. When executed by the processor 510, the control program 521 is used to implement any of the above-described methods for controlling a modular air conditioning unit.

[0135] The present invention has a plurality of exemplary embodiments, but, without departing from the spirit and scope of the present invention, many other variations or modifications that are consistent with the principles of the present invention can be directly determined or derived from the content disclosed in the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A control method for a combined air conditioning unit, characterized in that: The combined air conditioning unit comprises a fresh air passage, an exhaust air passage, an exhaust air valve and a return air valve; an exhaust fan is arranged in the exhaust air passage for introducing indoor air into the exhaust air passage; the return air valve is used to control the amount of return air from the exhaust air passage into the fresh air passage, and the exhaust air valve is used to control the amount of exhaust air from the exhaust air passage to the outside; The fresh air passage is provided with a blower for delivering the air in the fresh air passage into the room; The control method comprises: Obtain target exhaust volume; Controlling the opening of the return air valve and the exhaust air valve according to the target exhaust air volume; The exhaust fan and the supply fan are operated simultaneously, and the total exhaust volume of the exhaust fan is equal to the supply volume of the supply fan.

2. The control method according to claim 1, characterized in that: The exhaust fan is a variable frequency fan, so that the operating frequency of the exhaust fan is higher than the corresponding operating frequency of the exhaust fan when delivering the target exhaust air volume.

3. The control method according to claim 1, characterized in that: The exhaust fan is a constant speed motor.

4. The control method according to claim 1, characterized in that: The target exhaust volume includes at least a first exhaust volume and a second exhaust volume, wherein the first exhaust volume is greater than the second exhaust volume; Controlling at least the opening of the return air valve and the exhaust air valve according to the target exhaust air volume includes: When the target exhaust air volume is a first exhaust air volume, controlling the return air valve to perform a first opening, and controlling the exhaust air valve to perform a first preset opening; When the target exhaust air volume is a second exhaust air volume, controlling the return air valve to perform a second opening, and controlling the exhaust air valve to perform a second preset opening; The first opening is smaller than the second opening, and the first preset opening is larger than the second preset opening.

5. The control method according to claim 1, characterized in that: Obtain target exhaust volume, including: Get the context of the outdoor space; The target exhaust volume is obtained according to the environment of the outdoor space.

6. The control method according to claim 5, characterized in that: Acquiring the target exhaust volume according to the environment of the outdoor space includes: When the environment of the outdoor space is a transitional season condition, the target exhaust volume is a first exhaust volume; When the environment of the outdoor space is winter or summer working conditions, the target exhaust air volume is the second exhaust air volume; Wherein, the first exhaust air volume is greater than the second exhaust air volume.

7. The control method according to claim 1, characterized in that: Obtain target exhaust volume, including: Obtain target fresh air volume; The target exhaust air volume is obtained according to the target fresh air volume.

8. The control method according to claim 1, characterized in that: The combined air conditioning unit further comprises a rotor, and bypass channels are arranged on both upper and lower sides of the rotor, and a bypass control valve is arranged in the bypass channel; The control method further comprises: When the environment of the outdoor space is in a transitional season condition, the runner is controlled to stop, and the bypass control valve is controlled to open; When the environment of the outdoor space is in winter or summer, the rotor is controlled to start and stop in interlock with the blower, and the bypass control valve is controlled to close.

9. The control method according to claim 1, characterized in that: The combined air conditioning unit also includes a surface cooler; The control method further comprises: Obtaining the return air temperature in the exhaust duct; According to the return air temperature and the target temperature, the water inlet and outlet of the condenser are controlled to adjust the indoor temperature.

10. A combined air conditioning unit, characterized in that: It includes a controller, which includes a memory and a processor. The memory stores a control program, and when the control program is executed by the processor, it is used to implement the control method of the combined air-conditioning unit as described in any one of claims 1 to 9.

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