CN117704519A

CN117704519A - Control method and device of fresh air system and fresh air system

Info

Publication number: CN117704519A
Application number: CN202211089732.3A
Authority: CN
Inventors: 刘群波; 黄招彬; 许克; 李彬
Original assignee: GD Midea Air Conditioning Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2024-03-15

Abstract

The invention belongs to the technical field of fresh air systems, and discloses a control method and device of a fresh air system and the fresh air system. The fresh air system comprises an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switcher, a second switcher and a third switcher, wherein the air supply unit is internally provided with the first heat exchanger and the second heat exchanger, and the air exhaust unit is internally provided with the third heat exchanger; the switcher is used for switching the flow direction of the refrigerant flowing through each unit; the method comprises the following steps: determining a target operation mode of the fresh air system; the first, second and/or third switches are controlled according to the target operation mode to adjust the temperature of the air flowing through the air supply unit and/or the air exhaust unit. By the mode, the compressor is arranged in the fresh air system, and the switcher is controlled according to the target operation mode, so that the flow direction of the refrigerant in the system is switched, the indoor air temperature is regulated, and active refrigeration and heating are realized.

Description

Control method and device of fresh air system and fresh air system

Technical Field

The invention relates to the technical field of fresh air systems, in particular to a control method and device of a fresh air system and the fresh air system.

Background

The traditional fresh air fan mainly relies on the total heat exchange core to realize the heat exchange of indoor exhaust air and fresh air, and the compressor is not in the group, can't actively refrigerate and heat, or needs to be used together with the traditional air conditioner, and the repeated installation wastes manpower and materials.

The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.

Disclosure of Invention

The invention mainly aims to provide a control method and device of a fresh air system and the fresh air system, and aims to solve the technical problem that the traditional fresh air unit has no compressor and cannot actively perform refrigeration and heating.

In order to achieve the above purpose, the invention provides a control method of a fresh air system, the fresh air system comprises an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switcher, a second switcher and a third switcher, wherein the air supply unit is internally provided with a first heat exchanger and a second heat exchanger, and the air exhaust unit is internally provided with a third heat exchanger;

the first switcher is used for switching the flow direction of the refrigerant flowing through the outdoor heat exchanger, the second switcher is used for switching the flow direction of the refrigerant flowing through the third heat exchanger and the second heat exchanger, and the third switcher is used for switching the flow direction of the refrigerant flowing through the first heat exchanger;

The control method of the fresh air system comprises the following steps:

determining a target operation mode of the fresh air system;

and controlling the first switcher, the second switcher and/or the third switcher according to the target operation mode so as to adjust the temperature of air flowing through the air supply unit and/or the air exhaust unit.

Optionally, the controlling the first switch, the second switch and/or the third switch according to the target operation mode includes:

when the target operation mode is a refrigeration mode, an oil return mode or a defrosting mode, controlling the state of the first switcher so that a refrigerant discharged from an exhaust port of the compressor flows through the outdoor heat exchanger and then flows to the first heat exchanger and the second heat exchanger;

controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows through the third heat exchanger and then flows to the first heat exchanger and the second heat exchanger, and the refrigerant flowing out of the second heat exchanger flows back to the compressor;

and controlling the state of the third switcher so as to enable the refrigerant flowing out of the first heat exchanger to flow back to the compressor.

When the target operation mode is a dehumidification reheating mode, controlling the state of the first switcher so that the refrigerant discharged from the exhaust port of the compressor flows through the outdoor heat exchanger and then flows to the second heat exchanger;

controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows through the third heat exchanger and then flows to the second heat exchanger, and the refrigerant flowing out of the second heat exchanger flows back to the compressor;

and controlling the state of the third switcher so that the refrigerant discharged from the exhaust port of the compressor flows to the first heat exchanger.

when the target operation mode is a heating mode, controlling the state of the first switcher so that the refrigerant flowing out of the first heat exchanger and the second heat exchanger flows through the outdoor heat exchanger and then flows back to the compressor;

controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows through the second heat exchanger and then flows to the third heat exchanger, and the refrigerant flowing out of the third heat exchanger flows back to the compressor;

Optionally, the fresh air system further comprises a first throttling mechanism, a second throttling mechanism, a third throttling mechanism and a fourth throttling mechanism;

the first throttling mechanism is arranged at one end of the first heat exchanger, the second throttling mechanism is arranged at one end of the second heat exchanger, the third throttling mechanism is arranged at one end of the third heat exchanger, and the fourth throttling mechanism is arranged at one end of the outdoor heat exchanger;

after the determination of the target operating mode, the method further comprises:

and adjusting the opening degrees of the first throttling mechanism, the second throttling mechanism, the third throttling mechanism and the fourth throttling mechanism according to the control requirements corresponding to the target operation mode.

Optionally, the adjusting the opening degrees of the first throttle mechanism, the second throttle mechanism, the third throttle mechanism and the fourth throttle mechanism according to the control requirement corresponding to the target operation mode includes:

when the target operation mode is a refrigeration mode, determining the required refrigeration capacity corresponding to the refrigeration mode;

And adjusting the first throttling mechanism and the second throttling mechanism to reach corresponding opening degrees according to the required refrigerating capacity, and adjusting the third throttling mechanism and the fourth throttling mechanism to reach maximum opening degrees.

when the target operation mode is a heating mode, determining the required heating quantity corresponding to the cooling mode;

and adjusting the third throttling mechanism and the fourth throttling mechanism to reach corresponding opening degrees according to the required heating quantity, and adjusting the first throttling mechanism and the second throttling mechanism to reach maximum opening degrees.

In addition, in order to achieve the above purpose, the invention also provides a control device of a fresh air system, the fresh air system comprises an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switcher, a second switcher and a third switcher, wherein the air supply unit is internally provided with the first heat exchanger and the second heat exchanger, and the air exhaust unit is internally provided with the third heat exchanger;

The control device of the fresh air system comprises:

the determining module is used for determining a target operation mode of the fresh air system;

and the control module is used for controlling the first switcher, the second switcher and/or the third switcher according to the target operation mode so as to adjust the temperature of air flowing through the air supply unit and/or the air exhaust unit.

In addition, in order to achieve the above purpose, the present invention also provides a fresh air system, which includes an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switch, a second switch and a third switch, wherein the air supply unit is internally provided with a first heat exchanger and a second heat exchanger, and the air exhaust unit is internally provided with a third heat exchanger;

wherein the first end of the outdoor heat exchanger, the first end of the first heat exchanger, the first end of the second heat exchanger, and the first end of the third heat exchanger are in communication with each other; the first end of the first switcher is communicated with the exhaust port of the compressor, the second end and the third end of the first switcher are communicated with the air inlet of the compressor, and the fourth end of the first switcher is communicated with the second end of the outdoor heat exchanger; the first end of the second switcher is communicated with the exhaust port of the compressor, the second end of the second switcher is communicated with the second end of the second heat exchanger, the third end of the second switcher is communicated with the air inlet of the compressor, and the fourth end of the second switcher is communicated with the second end of the third heat exchanger; the first end of the third switcher is communicated with the exhaust port of the compressor, the second end of the third switcher is communicated with the second end of the first heat exchanger, and the third end and the fourth end of the third switcher are communicated with the air inlet of the compressor; the first switcher is used for switching the flow direction of the refrigerant flowing through the outdoor heat exchanger, the second switcher is used for switching the flow direction of the refrigerant flowing through the third heat exchanger and the second heat exchanger, and the third switcher is used for switching the flow direction of the refrigerant flowing through the first heat exchanger;

The fresh air system further comprises: and the processor is used for realizing the control method of the fresh air system.

the first throttling mechanism is arranged at the first end of the first heat exchanger, the second throttling mechanism is arranged at the first end of the second heat exchanger, the third throttling mechanism is arranged at the first end of the third heat exchanger, and the fourth throttling mechanism is arranged at the first end of the outdoor heat exchanger.

According to the invention, the compressor is arranged in the fresh air system, and the first switcher, the second switcher and/or the third switcher are controlled according to the target operation mode, so that the flow direction of the refrigerant in the system is switched, the first heat exchanger and the second heat exchanger in the air supply unit perform refrigeration or heating according to the inflowing refrigerant, the indoor air temperature is regulated, and the active refrigeration and heating of the fresh air system are realized.

Drawings

FIG. 1 is a schematic structural diagram of a fresh air system of a hardware operating environment according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart of a first embodiment of a control method of the fresh air system of the present invention;

FIG. 3 is a first schematic diagram of a fresh air system according to a first embodiment of the control method of the fresh air system of the present invention;

FIG. 4 is a second schematic diagram of the fresh air system according to the first embodiment of the control method of the fresh air system of the present invention;

FIG. 5 is a schematic flow chart of a second embodiment of a control method of the fresh air system of the present invention;

FIG. 6 is a schematic flow chart of a third embodiment of a control method of the fresh air system of the present invention;

FIG. 7 is a schematic diagram of a third embodiment of a method for controlling a fresh air system according to the present invention;

FIG. 8 is a flow chart of a fourth embodiment of a method for controlling a fresh air system according to the present invention;

FIG. 9 is a schematic diagram of a fourth embodiment of a method for controlling a fresh air system according to the present invention;

fig. 10 is a block diagram of a first embodiment of a control device of the fresh air system according to the present invention.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				1	Air supply unit	14	Fourth throttling mechanism
2	Air exhaust unit	15	Outdoor unit
				3	Compressor	16	High-voltage switch
4	Outdoor heat exchanger	17	High-voltage sensor
				5	First switcher	18	Oil separator
6	Second switcher	19	Low-voltage switch
				7	Third switcher	20	Low pressure sensor
8	First heat exchanger	21	Vapor-liquid separator
				9	Second heat exchanger	22	Condensation cooling
10	Third heat exchanger	23	First air pipe
				11	First throttle mechanism	24	Second air pipe
12	Second throttling mechanism	25	Third air pipe
				13	Third throttling mechanism	26	Liquid pipe

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a fresh air system of a hardware operation environment according to an embodiment of the present invention.

The fresh air system comprises an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switcher, a second switcher and a third switcher, wherein the first heat exchanger and the second heat exchanger are arranged in the air supply unit, and the third heat exchanger is arranged in the air exhaust unit;

wherein the first end of the outdoor heat exchanger, the first end of the first heat exchanger, the first end of the second heat exchanger, and the first end of the third heat exchanger are in communication with each other; the first end of the first switcher is communicated with the exhaust port of the compressor, the second end and the third end of the first switcher are communicated with the air inlet of the compressor, and the fourth end of the first switcher is communicated with the second end of the outdoor heat exchanger; the first end of the second switcher is communicated with the exhaust port of the compressor, the second end of the second switcher is communicated with the second end of the second heat exchanger, the third end of the second switcher is communicated with the air inlet of the compressor, and the fourth end of the second switcher is communicated with the second end of the third heat exchanger; the first end of the third switcher is communicated with the exhaust port of the compressor, the second end of the third switcher is communicated with the second end of the first heat exchanger, and the third end and the fourth end of the third switcher are communicated with the air inlet of the compressor; the first switcher is used for switching the flow direction of the refrigerant flowing through the outdoor heat exchanger, the second switcher is used for switching the flow direction of the refrigerant flowing through the third heat exchanger and the second heat exchanger, and the third switcher is used for switching the flow direction of the refrigerant flowing through the first heat exchanger.

The fresh air system provided by the embodiment of the invention further comprises a first throttling mechanism, a second throttling mechanism, a third throttling mechanism and a fourth throttling mechanism;

As shown in fig. 1, the fresh air system may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a Wireless interface (e.g., a Wireless-Fidelity (Wi-Fi) interface). The Memory 1005 may be a high-speed random access Memory (Random Access Memory, RAM) or a stable nonvolatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.

Those skilled in the art will appreciate that the configuration shown in FIG. 1 is not limiting of the fresh air system and may include more or fewer components than shown, or may combine certain components, or may be arranged in a different arrangement of components.

As shown in fig. 1, a memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a control program of the fresh air system.

In the fresh air system shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the fresh air system of the present invention may be disposed in the fresh air system, where the fresh air system invokes a control program of the fresh air system stored in the memory 1005 through the processor 1001, and executes a control method of the fresh air system provided by the embodiment of the present invention.

The embodiment of the invention provides a control method of a fresh air system, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the control method of the fresh air system.

In this embodiment, the fresh air system includes an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switcher, a second switcher and a third switcher, wherein the air supply unit is internally provided with a first heat exchanger and a second heat exchanger, and the air exhaust unit is internally provided with a third heat exchanger;

the control method of the fresh air system comprises the following steps:

step S10: and determining a target operation mode of the fresh air system.

It should be appreciated that optionally, a mode adjustment command entered by the user based on the control panel or remote control is received, and the target operating mode is determined in accordance with the mode adjustment command. Optionally, a mode preset table is searched according to the current time to determine a target operation mode. Optionally, the environmental information is acquired, a mode adjustment command is automatically triggered according to the environmental information, and the target operation mode is determined according to the mode adjustment command, for example, when the indoor temperature is higher than 30 degrees, the mode is automatically adjusted to be the refrigeration mode. The target operation mode of the present embodiment may be any one of a cooling mode, a dehumidifying and reheating mode, an oil return mode, a defrosting mode, and the like.

Step S20: and controlling the first switcher, the second switcher and/or the third switcher according to the target operation mode so as to adjust the temperature of air flowing through the air supply unit and/or the air exhaust unit.

It should be noted that the refrigerant flows corresponding to different operation modes are different, and in this embodiment, the refrigerant flows in the system are switched by controlling the first switch, the second switch and/or the third switch. In the concrete implementation, an air supply fan is arranged in the air supply unit, fresh air is introduced from the outside, heat exchange is carried out by utilizing the first heat exchanger and the second heat exchanger, and the treated fresh air is blown into the room by the air supply fan; an exhaust fan is arranged in the exhaust unit, gas is introduced from the room and exhausted to the outside, and indoor and outdoor air flow exchange is realized, so that the indoor air quality is improved.

In a specific implementation, the first heat exchanger and the second heat exchanger both comprise a first end and a second end, when the refrigerant flows in from the first end, the first heat exchanger and the second heat exchanger convert the liquid refrigerant into the gaseous refrigerant and flow out from the second end, and at the moment, the first heat exchanger and the second heat exchanger refrigerate air blown by the air supply fan; when the refrigerant flows in from the second end, the first heat exchanger and the second heat exchanger convert the gaseous refrigerant into the liquid refrigerant and flow out the liquid refrigerant from the first end, and at the moment, the first heat exchanger and the second heat exchanger heat the air blown by the air supply fan.

It should be understood that, referring to fig. 3, fig. 3 is a first schematic diagram of a fresh air system according to a first embodiment of a control method of the fresh air system of the present invention; the new trend system includes: the air supply unit 1, the air exhaust unit 2 and the outdoor unit 17, wherein a compressor 3, an outdoor heat exchanger 4, a first switcher 5, a second switcher 6, a second switcher 7, a high-voltage switch 16, a high-voltage sensor 17, an oil separator 18, a low-voltage switch 19, a low-voltage sensor 20, a vapor-liquid separator 21, a condensation cooling 22, a first air pipe 23, a second air pipe 24, a second air pipe 25 and a liquid pipe 26 are arranged in the outdoor unit 17, a first heat exchanger 8 and a second heat exchanger 9 are arranged in the air supply unit 1, and a third heat exchanger 10 is arranged in the air exhaust unit 2. The compressor 3 includes an air inlet and an air outlet, for the gaseous refrigerant flowing back to the compressor 3, the gaseous refrigerant is converted into a low-pressure gaseous refrigerant through the vapor-liquid separator 21, the low-pressure sensor 20 and the low-pressure switch 19, flows into the compressor 3 for processing, obtains a high-temperature high-pressure gaseous refrigerant through the high-pressure switch 16 and the high-pressure sensor 17, flows into the first switch 5, the second switch 6 and the third switch 7 after being processed by the oil separator 18, and adjusts the flow direction of the refrigerant by controlling the state of the switches.

In fig. 3, the first switch 5, the second switch 6 and the third switch 7 are four-way valves. The first switch 5 includes four passage ports D, E, S, C, wherein the passage port D communicates with the discharge port of the compressor 3, the passage C communicates with the outdoor heat exchanger 4, the passage port E and the passage port S both communicate with the intake port of the compressor 3, and the first switch 5 is controlled to switch between a first state in which the DC passage port of the first switch 5 communicates with the ES passage port so that the refrigerant discharged from the discharge port of the compressor 3 flows through the outdoor heat exchanger 4 to the first heat exchanger 8 and the second heat exchanger 9, and a second state in which the DE passage port of the first switch 5 communicates with the SC passage port so that the refrigerant flowing through the outdoor heat exchanger 4 flows back to the intake port of the compressor 3 through the passage port of the first switch 5.

The second switch 6 includes four passage ports D, E, S, C, wherein a passage port D communicates with the discharge port of the compressor 3, a passage port E communicates with the second heat exchanger 9 through the second air pipe 24, a passage port S communicates with the intake port of the compressor 3, a passage port C communicates with the third heat exchanger 10 through the third air pipe, the second switch 6 is controlled to switch between a third state in which the DC passage port of the second switch 6 communicates with the ES passage port so that the refrigerant discharged from the discharge port of the compressor 3 flows to the third heat exchanger 10, and the refrigerant discharged from the second heat exchanger 9 flows back to the intake port of the compressor 3 through the ES passage port, and a fourth state in which the DE passage port of the second switch 6 communicates with the SC passage port so that the refrigerant discharged from the discharge port of the compressor 3 flows to the second heat exchanger 9 and the refrigerant discharged from the third heat exchanger 10 flows back to the intake port of the compressor 3.

The third switch 7 includes four passage ports D, E, S, C, wherein the passage port D communicates with the discharge port of the compressor 3, the passage port E communicates with the first heat exchanger 8 through the first air pipe 23, both the passage port S and the passage port C communicate with the intake port of the compressor 3, and the third switch 7 is controlled to switch between a fifth state in which the DC passage port of the third switch 7 communicates, the ES passage port communicates, so that the refrigerant flowing out of the first heat exchanger 8 flows back to the intake port of the compressor 3, and a sixth state in which the DE passage port of the third switch 7 communicates, the SC passage port communicates, so that the refrigerant discharged from the discharge port of the compressor 3 flows to the first heat exchanger 8.

Referring to fig. 3, when the target operation mode is the cooling mode, the oil return mode, or the defrosting mode, the state of the first switch 5 is controlled to be the first state (DC port communication, ES port communication), the state of the second controller 6 is controlled to be the third state (DC port communication, ES port communication), and the state of the third controller 7 is controlled to be the fifth state (DC port communication, ES port communication). When the target operation mode is the dehumidification reheat mode, the state of the first switch 5 is controlled to be the first state (DC port communication, ES port communication), the state of the second controller 6 is controlled to be the third state (DC port communication, ES port communication), and the state of the third controller 7 is controlled to be the sixth state (DE port communication, SC port communication). When the target operation mode is the heating mode, the state of the first switch 5 is controlled to be the second state (DE port communication, SC port communication), the state of the second controller 6 is controlled to be the fourth state (DE port communication, SC port communication), and the state of the third controller 7 is controlled to be the sixth state (DE port communication, SC port communication).

Further, the fresh air system further comprises a first throttling mechanism, a second throttling mechanism, a third throttling mechanism and a fourth throttling mechanism;

after the step S10, the method further includes: and adjusting the opening degrees of the first throttling mechanism, the second throttling mechanism, the third throttling mechanism and the fourth throttling mechanism according to the control requirements corresponding to the target operation mode.

It should be understood that the control requirement corresponding to the target operation mode is determined according to the target value or the target strength set by the user, and the adjustment of the temperature or the strength is achieved by adjusting the opening degree of the throttle mechanism.

It should be noted that, the opening degrees of the throttle mechanisms controlled by the different operation modes are different, referring to fig. 4, fig. 4 is a second schematic diagram of the fresh air system according to the first embodiment of the control method of the fresh air system of the present invention; the first throttle mechanism 11, the second throttle mechanism 12, the third throttle mechanism 13 and the fourth throttle mechanism 14 are electronic expansion valves, wherein the first throttle mechanism 11 is arranged at the first end of the first heat exchanger 8, and the opening degree of the first throttle mechanism 11 is controlled to control the refrigerant flow rate at the first end of the first heat exchanger 8. The second throttle mechanism 12 is provided at the first end of the second heat exchanger 9, and the opening degree of the second throttle mechanism 12 is controlled to control the refrigerant flow rate at the first end of the second heat exchanger 9. The third throttle mechanism 13 is provided at the first end of the third heat exchanger 10, and controls the refrigerant flow rate at the first end of the third heat exchanger 10 by controlling the opening degree of the third throttle mechanism 13. The fourth throttle mechanism 14 is provided at the first end of the outdoor heat exchanger 4, and the refrigerant flow rate at the first end of the outdoor heat exchanger 4 is controlled by controlling the opening degree of the fourth throttle mechanism 14.

Alternatively, when the target operation mode is the dehumidification reheat mode, the target opening degree of the second throttle mechanism 12 is determined according to the control requirement (dehumidification intensity value or mode default value) corresponding to the dehumidification reheat mode, the opening degree of the second throttle mechanism 12 is controlled to reach the target opening degree, and the opening degrees of the first throttle mechanism 11, the third throttle mechanism 13 and the fourth throttle mechanism 14 are controlled to reach the maximum opening degree.

Alternatively, when the target operation mode is the oil return mode or the defrosting mode, the target opening degrees of the first throttle mechanism 11 and the second throttle mechanism 12 are determined according to the control requirement, the opening degrees of the first throttle mechanism 11 and the second throttle mechanism 12 are controlled to reach the target opening degrees, and the opening degrees of the three throttle mechanisms 13 and the fourth throttle mechanism 14 are controlled to reach the maximum opening degrees.

Optionally, the adjusting the opening degrees of the first throttle mechanism, the second throttle mechanism, the third throttle mechanism and the fourth throttle mechanism according to the control requirement corresponding to the target operation mode includes: when the target operation mode is a refrigeration mode, determining the required refrigeration capacity corresponding to the refrigeration mode; and adjusting the first throttling mechanism and the second throttling mechanism to reach corresponding opening degrees according to the required refrigerating capacity, and adjusting the third throttling mechanism and the fourth throttling mechanism to reach maximum opening degrees.

It should be understood that, referring to fig. 4, in the cooling mode, the DC port of the first switch 5 is controlled to be communicated, the ES port is controlled to be communicated, the DC port of the second switch 6 is controlled to be communicated, the ES port is controlled to be communicated, the DC port of the third switch 7 is controlled to be communicated, the ES port is controlled to be communicated, the first throttle mechanism 11 is controlled to throttle (the specific opening is determined according to the required cooling capacity), the second throttle mechanism 12 is controlled to throttle (the specific opening is determined according to the required cooling capacity), the third throttle mechanism 13 is fully opened, and the fourth throttle mechanism 14 is fully opened.

Optionally, the adjusting the opening degrees of the first throttle mechanism, the second throttle mechanism, the third throttle mechanism and the fourth throttle mechanism according to the control requirement corresponding to the target operation mode includes: when the target operation mode is a heating mode, determining the required heating quantity corresponding to the cooling mode; and adjusting the third throttling mechanism and the fourth throttling mechanism to reach corresponding opening degrees according to the required heating quantity, and adjusting the first throttling mechanism and the second throttling mechanism to reach maximum opening degrees.

In the heating mode, the DE port and SC port of the first switch 5 and the DC port and ES port of the second switch 6 are controlled to be communicated, the DE port and SC port of the third switch 7 are controlled to be communicated, the first throttle mechanism 11 is fully opened, the second throttle mechanism 12 is fully opened, the third throttle mechanism 13 is throttled (the specific opening is determined according to the amount of heating required), and the fourth throttle mechanism 14 is throttled (the specific opening is determined according to the amount of heating required).

In this embodiment, the compressor is disposed in the fresh air system, and the first switch, the second switch and/or the third switch are controlled according to the target operation mode, so that the flow direction of the refrigerant in the system is switched, the first heat exchanger and the second heat exchanger in the air supply unit perform refrigeration or heating according to the inflowing refrigerant, and the indoor air temperature is adjusted, so that the active refrigeration and heating of the fresh air system are realized.

Referring to fig. 5, fig. 5 is a schematic flow chart of a second embodiment of a control method of the fresh air system of the present invention.

Based on the above-mentioned first embodiment, the step S20 of the control method of the fresh air system of this embodiment includes:

step S201: and when the target operation mode is a refrigeration mode, an oil return mode or a defrosting mode, controlling the state of the first switcher so that the refrigerant flows through the compressor and the outdoor heat exchanger and then flows to the first heat exchanger and the second heat exchanger.

As will be understood, referring to fig. 3 and 4, in the cooling mode, the DC passage opening of the first switch 5 is controlled to be communicated, the ES passage opening is controlled to be communicated, the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port of the compressor 3 flows to the outdoor heat exchanger 4 through the DC passage of the first switch 5, the outdoor heat exchanger 4 processes the gaseous refrigerant into a liquid refrigerant, and the liquid refrigerant flows to the first heat exchanger 8 and the second heat exchanger 9 through the liquid pipe 26 after being subjected to the refrigerant cooling process.

Step S202: and controlling the state of the second switcher so that the refrigerant flows into the first heat exchanger and the second heat exchanger after flowing through the compressor and the third heat exchanger, and the refrigerant flowing out of the second heat exchanger flows into the compressor.

Referring to fig. 3 and 4, the DC passage opening of the second switch 6 is controlled to be communicated, the ES passage opening is controlled to be communicated, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor 3 flows to the third heat exchanger 10 through the DC passage of the second switch 6 and the third air pipe 25, the gaseous refrigerant is processed into a liquid refrigerant by the third heat exchanger 10, the temperature of the gas at a lower temperature led out from the room through the exhaust fan is reduced, and the cooled liquid refrigerant flows to the first heat exchanger 8 and the second heat exchanger 9, so that the recovery of indoor exhaust heat is realized, and the operation efficiency of the whole machine is improved.

Step S203: and controlling the state of the third switcher so as to enable the refrigerant flowing out of the first heat exchanger to flow to the compressor.

It should be understood that referring to fig. 3 and 4, the DC passage port of the third switch 7 is controlled to be communicated and the ES passage port is controlled to be communicated, the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port of the compressor 3 flows back to the inlet port of the compressor 3 via the DC passage of the third switch 7, the first heat exchanger 8 processes the inflowing liquid refrigerant into gaseous refrigerant, and flows into the inlet port of the compressor 3 via the ES passage of the third switch 7.

The liquid refrigerant flowing out of the outdoor heat exchanger 4 and the third heat exchanger 10 flows into the first heat exchanger 8 and the second heat exchanger 9, so that the first heat exchanger 8 and the second heat exchanger 9 process the liquid refrigerant into a gaseous refrigerant, and thus the air blown by the air supply fan is cooled. On the one hand, the lubricating oil discharged by the compressor 3 along with the refrigerant gas is discharged back to the compressor through the outdoor heat exchanger 4, the first heat exchanger 8, the second heat exchanger 9 and the third heat exchanger 10, so that the oil return effect is realized, on the other hand, the compressor 3 transmits the gaseous refrigerant to the outdoor heat exchanger 4 for treatment, the outdoor heat exchanger 4 converts the gaseous refrigerant into the liquid refrigerant, and at the moment, the heat is dissipated to the environment, so that the defrosting effect is realized.

In this embodiment, the compressor is disposed in the fresh air system, and states of the first switcher, the second switcher and the third switcher are controlled according to a refrigeration mode, so that a refrigerant flowing out of the compressor flows to the first heat exchanger and the second heat exchanger through the outdoor heat exchanger or the third heat exchanger, the first heat exchanger and the second heat exchanger in the air supply unit refrigerates according to the flowing refrigerant, and the indoor air temperature is adjusted, so that active refrigeration of the fresh air system is realized.

Referring to fig. 6, fig. 6 is a schematic flow chart of a third embodiment of a control method of the fresh air system according to the present invention.

step S204: and when the target operation mode is a dehumidification reheating mode, controlling the state of the first switcher so that the refrigerant flows through the compressor and the outdoor heat exchanger and then flows to the second heat exchanger.

It should be understood that, referring to fig. 7, fig. 7 is a schematic diagram of a fresh air system according to a third embodiment of the control method of the fresh air system of the present invention; in the dehumidification reheating mode, the DC passage opening and the ES passage opening of the first switch 5 are controlled to be communicated, and the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor 3 flows to the outdoor heat exchanger 4 through the DC passage of the first switch 5, the outdoor heat exchanger 4 processes the gaseous refrigerant into a liquid refrigerant, and the liquid refrigerant is cooled and then flows to the second heat exchanger 9 through the liquid pipe 26.

Step S205: and controlling the state of the second switcher so that the refrigerant flows through the compressor and the third heat exchanger and then flows to the second heat exchanger, and the refrigerant flowing out of the second heat exchanger flows to the compressor.

The DC passage port and ES passage port of the second switch 6 are controlled to communicate, and the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port of the compressor 3 flows to the third heat exchanger 10 via the DC passage and the third gas pipe 25 of the second switch 6, and the third heat exchanger 10 processes the gaseous refrigerant into a liquid refrigerant and flows to the second heat exchanger 9.

Step S206: and controlling the state of the third switcher so as to enable the refrigerant flowing out of the compressor to flow to the first heat exchanger.

It should be understood that the DE passage port of the third switch 7 is controlled to be communicated and the SC passage port is controlled to be communicated, and the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port of the compressor 3 flows to the first heat exchanger 8 through the DE passage of the third switch 7, and the first heat exchanger 8 processes the inflowing gaseous refrigerant into a liquid refrigerant and flows to the second heat exchanger 9.

The first heat exchanger 8 heats the gaseous refrigerant by converting the gaseous refrigerant into a liquid refrigerant and radiating the liquid refrigerant to the environment. The second heat exchanger 8 processes the liquid refrigerant flowing in by the first heat exchanger 8, the third heat exchanger 10 and the outdoor heat exchanger 4 into a gaseous refrigerant, so that refrigeration is performed, and the dehumidification and reheating effects of the fresh air system are ensured.

In this embodiment, the compressor is arranged in the fresh air system, and the states of the first switcher, the second switcher and the third switcher are controlled according to the dehumidification reheating mode, so that the flow direction of the refrigerant in the system is switched, the refrigerant flowing out of the compressor flows to the second heat exchanger through the outdoor heat exchanger, the first heat exchanger or the third heat exchanger, the first heat exchanger in the air supply unit heats according to the flowing-in refrigerant, the second heat exchanger refrigerates according to the flowing-in refrigerant, dehumidification reheating of the fresh air system is realized, and functions of the fresh air system are enriched.

Referring to fig. 8, fig. 8 is a flow chart of a fourth embodiment of a control method of the fresh air system according to the present invention.

step S207: and when the target operation mode is a heating mode, controlling the state of the first switcher so that the refrigerant flowing out of the first heat exchanger and the second heat exchanger flows into the compressor after flowing through the outdoor heat exchanger.

It should be understood that, referring to fig. 9, fig. 9 is a schematic diagram of a fresh air system according to a fourth embodiment of the control method of the fresh air system of the present invention; in the heating mode, the DE passage opening communication and the SC passage opening communication of the first switch 5 are controlled, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor 3 flows back to the air inlet of the compressor 3 through the DE passage of the first switch 5, one part of the liquid refrigerant flowing out of the first heat exchanger 8 and the second heat exchanger 9 flows to the outdoor heat exchanger 4, the other part flows to the third heat exchanger 10, the outdoor heat exchanger 4 processes the liquid refrigerant into the gaseous refrigerant, and the gaseous refrigerant flows back to the air inlet of the compressor 3 through the SC passage of the first switch 5.

Step S208: and controlling the state of the second switcher so that the refrigerant flows through the compressor and the second heat exchanger and then flows to the third heat exchanger, and the refrigerant flowing out of the third heat exchanger flows to the compressor.

The DE passage port and SC passage port of the second switch 6 are controlled to communicate, and the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor 3 flows to the second heat exchanger 9 via the DE passage of the second switch 6 and the second gas pipe 24, and the second heat exchanger 9 processes the gaseous refrigerant into a liquid refrigerant and flows to the third heat exchanger 10 and the outdoor heat exchanger 4. The third heat exchanger 10 processes the liquid refrigerant flowing into the air-conditioning device into a gaseous refrigerant, and the gaseous refrigerant flows back to the air intake of the compressor 3 through the third gas pipe 25 and the SC channel of the second switch 6.

Step S209: and controlling the state of the third switcher so as to enable the refrigerant flowing out of the compressor to flow to the first heat exchanger.

It should be understood that the DE passage port communication and the SC passage port communication of the third switch 7 are controlled, and the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port of the compressor 3 flows to the first heat exchanger 8 via the DE passage of the third switch 7 and the first gas pipe 23, and the first heat exchanger 8 processes the gaseous refrigerant into a liquid refrigerant and flows to the third heat exchanger 10 and the outdoor heat exchanger 4.

By controlling the states of the first switch, the second switch, and the third switch, the refrigerant flowing out of the compressor 3 flows to the first heat exchanger 8 and the second heat exchanger 9, a part of the liquid refrigerant flowing out of the first heat exchanger 8 and the second heat exchanger 9 flows to the outdoor heat exchanger 4, and the other part flows to the third heat exchanger 10, and the outdoor heat exchanger 4 and the third heat exchanger 10 process the liquid refrigerant into a gaseous refrigerant and flow back to the compressor 3. The first heat exchanger 8 and the second heat exchanger 9 process the inflowing gaseous refrigerant into liquid refrigerant, so as to heat the air blown by the air supply fan.

In this embodiment, the compressor is disposed in the fresh air system, and states of the first switcher, the second switcher and the third switcher are controlled according to a heating mode, so that a refrigerant flowing out of the compressor flows to the first heat exchanger and the second heat exchanger, the first heat exchanger and the second heat exchanger in the air supply unit perform heating according to the flowing-in refrigerant, and indoor air temperature is adjusted, so that active heating of the fresh air system is realized.

In addition, the embodiment of the invention also provides a storage medium, wherein the storage medium is stored with a control program of the fresh air system, and the control program of the fresh air system realizes the control method of the fresh air system when being executed by a processor.

Because the storage medium adopts all the technical schemes of all the embodiments, the storage medium has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here.

Referring to fig. 10, fig. 10 is a block diagram illustrating a first embodiment of a control device of a fresh air system according to the present invention.

As shown in fig. 10, the fresh air system provided by the embodiment of the invention comprises an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switcher, a second switcher and a third switcher, wherein the air supply unit is internally provided with a first heat exchanger and a second heat exchanger, and the air exhaust unit is internally provided with a third heat exchanger;

the control device of the fresh air system comprises:

and the determining module 10 is used for determining a target operation mode of the fresh air system.

And a control module 20 for controlling the first, second and/or third switches according to the target operation mode to adjust the temperature of the air flowing through the air supply unit and/or the air exhaust unit.

the control module 20 is further configured to adjust the opening degrees of the first throttle mechanism, the second throttle mechanism, the third throttle mechanism, and the fourth throttle mechanism according to the control requirements corresponding to the target operation mode.

Optionally, the control module 20 is further configured to determine, when the target operation mode is a cooling mode, a required cooling capacity corresponding to the cooling mode; and adjusting the first throttling mechanism and the second throttling mechanism to reach corresponding opening degrees according to the required refrigerating capacity, and adjusting the third throttling mechanism and the fourth throttling mechanism to reach maximum opening degrees.

Optionally, the control module 20 is further configured to determine a required heating amount corresponding to the cooling mode when the target operation mode is a heating mode; and adjusting the third throttling mechanism and the fourth throttling mechanism to reach corresponding opening degrees according to the required heating quantity, and adjusting the first throttling mechanism and the second throttling mechanism to reach maximum opening degrees.

It should be understood that the foregoing is illustrative only and is not limiting, and that in specific applications, those skilled in the art may set the invention as desired, and the invention is not limited thereto.

It should be noted that the above-described working procedure is merely illustrative, and does not limit the scope of the present invention, and in practical application, a person skilled in the art may select part or all of them according to actual needs to achieve the purpose of the embodiment, which is not limited herein.

In addition, technical details which are not described in detail in the embodiment can be referred to the control method of the fresh air system provided in any embodiment of the present invention, and are not described here again.

Furthermore, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. Read Only Memory)/RAM, magnetic disk, optical disk) and including several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.

The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims

1. The control method of the fresh air system is characterized in that the fresh air system comprises an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switcher, a second switcher and a third switcher, wherein the air supply unit is internally provided with a first heat exchanger and a second heat exchanger, and the air exhaust unit is internally provided with a third heat exchanger;

the control method of the fresh air system comprises the following steps:

determining a target operation mode of the fresh air system;

2. The method for controlling a fresh air system according to claim 1, wherein the controlling the first switch, the second switch, and/or the third switch according to the target operation mode includes:

3. The method for controlling a fresh air system according to claim 1, wherein the controlling the first switch, the second switch, and/or the third switch according to the target operation mode includes:

4. The method for controlling a fresh air system according to claim 1, wherein the controlling the first switch, the second switch, and/or the third switch according to the target operation mode includes:

5. The control method of a fresh air system according to any one of claims 1 to 4, wherein the fresh air system further comprises a first throttle mechanism, a second throttle mechanism, a third throttle mechanism, and a fourth throttle mechanism;

6. The method for controlling a fresh air system according to claim 5, wherein adjusting the opening degrees of the first throttle mechanism, the second throttle mechanism, the third throttle mechanism, and the fourth throttle mechanism according to the control requirements corresponding to the target operation mode comprises:

7. The method for controlling a fresh air system according to claim 5, wherein adjusting the opening degrees of the first throttle mechanism, the second throttle mechanism, the third throttle mechanism, and the fourth throttle mechanism according to the control requirements corresponding to the target operation mode comprises:

8. The control device of the fresh air system is characterized by comprising an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switcher, a second switcher and a third switcher, wherein the air supply unit is internally provided with a first heat exchanger and a second heat exchanger, and the air exhaust unit is internally provided with a third heat exchanger;

the control device of the fresh air system comprises:

9. The fresh air system is characterized by comprising an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switcher, a second switcher and a third switcher, wherein the first heat exchanger and the second heat exchanger are arranged in the air supply unit, and the third heat exchanger is arranged in the air exhaust unit;

The fresh air system further comprises: a processor for implementing the control method of the fresh air system according to any one of claims 1 to 7.

10. The fresh air system of claim 9, further comprising a first throttling mechanism, a second throttling mechanism, a third throttling mechanism, and a fourth throttling mechanism;