CN117663374A

CN117663374A - Control method and device of fresh air system and fresh air system

Info

Publication number: CN117663374A
Application number: CN202211090752.2A
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: 2024-03-08

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 and a second switcher, wherein the air supply unit is internally provided with the first heat exchange unit, and the air exhaust unit is internally provided with the second heat exchange unit; the first switcher is used for switching the flow direction of the refrigerant flowing through the outdoor heat exchanger and the first heat exchange unit, and the second switcher is used for switching the flow direction of the refrigerant flowing through the second heat exchange unit; the method comprises the following steps: determining a target operation mode of the fresh air system; the first switch and/or the second switch 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.

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

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

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

Determining a target operation mode of the fresh air system; and

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

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

when the target operation mode is a refrigeration mode, controlling the state of the first switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the outdoor heat exchanger and the first heat exchange unit; and

and controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the second heat exchange unit and the first heat exchange unit.

when the target operation mode is a heating mode, controlling the state of the first switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the first heat exchange unit and the outdoor heat exchanger; and

And controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the first heat exchange unit and the second heat exchange unit.

when the target operation mode is an oil return mode or a defrosting mode, controlling the state of the first switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the outdoor heat exchanger and the first heat exchange unit; and

and controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the outdoor heat exchanger and the second heat exchange unit.

Optionally, the fresh air system further comprises a first electromagnetic valve and a second electromagnetic valve, and a third heat exchange unit is further arranged in the air supply unit;

the first end of the first heat exchange unit, the first end of the third heat exchange unit, the first end of the second heat exchange unit and the first end of the outdoor heat exchanger are communicated with each other, the first electromagnetic valve is arranged between the second end of the third heat exchange unit and the second end of the second heat exchange unit, the second electromagnetic valve is arranged between the second end of the first heat exchange unit and the second end of the third heat exchange unit, and the first switcher, the second switcher, the first electromagnetic valve and the second electromagnetic valve are used for switching the flow direction of the refrigerant flowing through the third heat exchange unit;

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

and controlling the opening and closing states of the first electromagnetic valve and/or the second electromagnetic valve according to the target operation mode.

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 back to the compressor after sequentially passing through the outdoor heat exchanger and the first heat exchange unit; and

controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the second heat exchange unit and the first heat exchange unit;

the controlling the opening and closing states of the first electromagnetic valve and/or the second electromagnetic valve according to the target operation mode comprises the following steps:

and controlling the state of the first electromagnetic valve to be an opening state and the state of the second electromagnetic valve to be a closing state according to the dehumidification reheating mode so as to enable the refrigerant flowing from the exhaust port of the compressor to the second heat exchange unit to be split into the third heat exchange unit for heating.

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

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.

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 and a second switcher, wherein the air supply unit is internally provided with the first heat exchange unit, and the air exhaust unit is internally provided with the second heat exchange unit;

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

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

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

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

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

the first end of the first heat exchange unit, the first end of the third heat exchange unit, the first end of the second heat exchange unit and the first end of the outdoor heat exchanger are mutually communicated, the first electromagnetic valve is arranged between the second end of the third heat exchange unit and the second end of the second heat exchange unit, the second electromagnetic valve is arranged between the second end of the first heat exchange unit and the second end of the third heat exchange unit, and the first switcher, the second switcher, the first electromagnetic valve and the second electromagnetic valve are used for switching the flow direction of the refrigerant flowing through the third heat exchange unit.

According to the invention, the compressor is arranged in the fresh air system, and the first switcher and/or the second 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 exchange unit in the air supply unit performs refrigeration or heating according to the inflowing refrigerant, and the indoor air temperature is regulated, so that 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 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 schematic flow chart of a second embodiment of a control method of the fresh air system of the present invention;

FIG. 5 is a schematic diagram of a first mode of a fresh air system according to a second embodiment of the control method of the fresh air system of the present invention;

FIG. 6 is a schematic diagram of a second mode of a fresh air system according to a second embodiment of the control method of the fresh air system of the present invention;

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

FIG. 8 is a schematic diagram of a fourth mode of a fresh air system according to a second embodiment of the control method of the fresh air system of the present invention;

FIG. 9 is a schematic flow chart of a third embodiment of a control method of the fresh air system of the present invention;

FIG. 10 is a schematic diagram of a third embodiment of a method for controlling a fresh air system according to the present invention;

fig. 11 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	15	Fourth throttling mechanism
2	Air exhaust unit	16	Outdoor unit
				3	Compressor	17	High-voltage switch
4	Outdoor heat exchanger	18	High-voltage sensor
				5	First switcher	19	Oil separator
6	Second switcher	20	Low-voltage switch
				7	First heat exchange unit	21	Low pressure sensor
8	Second heat exchange unit	22	Vapor-liquid separator
				9	First electromagnetic valve	23	Condensation cooling
10	Second electromagnetic valve	24	First air pipe
				11	Third heat exchange unit	25	Second air pipe
12	First throttle mechanism	26	Liquid pipe
				13	Second throttling mechanism	27	One-way valve
14	Third throttling mechanism

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 and a second switcher, wherein the air supply unit is internally provided with the first heat exchange unit, and the air exhaust unit is internally provided with the second heat exchange unit;

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

The fresh air system of the embodiment of the invention further comprises a first electromagnetic valve and a second electromagnetic valve, and a third heat exchange unit is arranged in the air supply unit;

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 switch and a second switch, wherein the air supply unit is internally provided with a first heat exchange unit, and the air exhaust unit is internally provided with a second heat exchange unit;

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 understood that, optionally, a mode adjustment instruction input by the user based on the control panel or the remote controller is received, and the target operation mode of the fresh air system is determined according to the mode adjustment instruction. 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 and/or the second switcher according to the target operation mode 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 and/or the second 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 using the first heat exchange unit, 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 exchange unit comprises a first end and a second end, when the refrigerant flows in from the first end, the first heat exchange unit converts the liquid refrigerant into a gaseous refrigerant and flows out from the second end, and at the moment, the first heat exchange unit refrigerates air blown in by the air supply fan; when the refrigerant flows in from the second end, the first heat exchange unit converts the gaseous refrigerant into the liquid refrigerant and flows out of the first end, and at the moment, the first heat exchange unit heats air blown by the air supply fan.

Optionally, the step S20 includes: when the target operation mode is a refrigeration mode, controlling the state of the first switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the outdoor heat exchanger and the first heat exchange unit; and controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the second heat exchange unit and the first heat exchange unit.

It should be understood that when the target operation mode is the cooling mode, the states of the first and second switches are controlled such that the refrigerant flows through the first circuit, which is the compressor→the outdoor heat exchanger→the first heat exchange unit→the compressor, and the second circuit, which is the compressor→the second heat exchange unit→the first heat exchange unit→the compressor. In the first loop, the compressor flows out of the gaseous refrigerant, is processed into a liquid refrigerant through the outdoor heat exchanger, and then flows into the first heat exchange unit, the first heat exchange unit converts the liquid refrigerant into the gaseous refrigerant and then flows back to the compressor, and when the first heat exchange unit processes, heat is absorbed from ambient air, so that refrigeration is performed. In the second loop, the compressor flows out of the gaseous refrigerant, is processed into the liquid refrigerant through the second heat exchange unit and flows into the first heat exchange unit, the first heat exchange unit converts the liquid refrigerant into the gaseous refrigerant and flows back to the compressor, and when the first heat exchange unit processes, heat is absorbed from ambient air so as to refrigerate, wherein the temperature of gas introduced from the room by the air exhaust fan in the air exhaust unit is lower, the liquid refrigerant flowing out of the second heat exchange unit is cooled through cold air blown out by the air exhaust fan, the cooled liquid refrigerant flows into the first heat exchange unit, the indoor air exhaust heat is recovered, and the operation efficiency of the whole machine is improved.

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

In fig. 3, the first switch 5 and the second switch 6 are four-way valves. The first switch 5 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 first heat exchanging unit 7 through the second air pipe 25, a passage port S communicates with the intake port of the compressor 3, a passage port C communicates with the outdoor heat exchanger 4, 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 flows through the compressor 3, the outdoor heat exchanger 4, and the first heat exchanging unit 7 and then flows back to the compressor 3, 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 flows through the compressor 3, the first heat exchanging unit 7, and the outdoor heat exchanger 4 and then flows back to the compressor 3. The second switch 6 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 second heat exchange unit 8 through the first air pipe 24, both the passage port S and the passage port C communicate with the intake port of the compressor 3, the second switch 5 is controlled to switch between a third state in which the DE passage port of the second switch 6 communicates, the SC passage port communicates so that the refrigerant flowing out of the compressor 3 flows to the second heat exchange unit 8, and a fourth state in which the DC passage port of the second switch 6 communicates, the ES passage port communicates so that the refrigerant flowing out of the second heat exchange unit 8 flows to the compressor 3. When the current target operation mode is the cooling mode, the state of the first switch 5 is controlled to be adjusted to the first state, and the state of the second switch 6 is controlled to be switched to the third state.

Optionally, the step S20 includes: when the target operation mode is a heating mode, controlling the state of the first switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the first heat exchange unit and the outdoor heat exchanger; and controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the first heat exchange unit and the second heat exchange unit.

It is understood that when the target operation mode is the heating mode, the states of the first switch and the second switch are controlled such that the refrigerant flows through the third circuit and the fourth circuit, the third circuit is the compressor→the first heat exchange unit→the outdoor heat exchanger→the compressor, and the fourth circuit is the compressor→the first heat exchange unit→the second heat exchange unit→the compressor. The compressor flows out of the gaseous refrigerant, after being processed into the liquid refrigerant through the first heat exchange unit, one part of the liquid refrigerant flows into the outdoor heat exchanger, the outdoor heat exchanger converts the liquid refrigerant into the gaseous refrigerant and then flows back to the compressor, the other part of the liquid refrigerant flows into the second heat exchange unit, the second heat exchange unit converts the liquid refrigerant into the gaseous refrigerant and then flows back to the compressor, and when the first heat exchange unit performs processing, heat is dissipated to the environment, so that heating is performed.

Taking fig. 3 as an example, when the current target operation mode is the heating mode, the state of the first switch is controlled to be adjusted to the second state, and the state of the second switch is controlled to be switched to the fourth state. At this time, the DE passage opening of the first switch 5 is communicated, the SC passage opening is communicated, so that the refrigerant flows through the compressor 3, the first heat exchange unit 7 and the outdoor heat exchanger 4 and then flows back to the compressor 3, the DC passage opening of the second switch 6 is communicated, and the ES passage opening is communicated, so that a part of the refrigerant flowing out of the first heat exchange unit 7 flows to the compressor 3 through the second heat exchange unit 8, wherein the gaseous refrigerant flowing out of the compressor 3 flows into the first heat exchange unit 7, and the first heat exchange unit 7 converts the gaseous refrigerant into the liquid refrigerant, thereby heating the air blown by the air blower.

Optionally, the step S20 includes: when the target operation mode is an oil return mode or a defrosting mode, controlling the state of the first switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the outdoor heat exchanger and the first heat exchange unit; and controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the outdoor heat exchanger and the second heat exchange unit.

When the target operation mode is the oil return mode or the defrosting mode, the states of the first switch and the second switch are controlled so that the refrigerant flows through the first loop and the fifth loop, wherein the first loop is a compressor, an outdoor heat exchanger, a first heat exchange unit and a compressor, and the fifth loop is a compressor, an outdoor heat exchanger, a second heat exchange unit and a compressor. The compressor flows out the gaseous refrigerant, is processed into liquid refrigerant through the outdoor heat exchanger, and then flows into the first heat exchange unit and the second heat exchange unit respectively, and the first heat exchange unit and the second heat exchange unit convert the liquid refrigerant into the gaseous refrigerant and then flow back to the compressor. On one hand, the lubricating oil discharged by the compressor along with the refrigerant gas is discharged back to the compressor through the first loop and the second loop, so that the oil return effect is realized, on the other hand, the compressor transmits the gaseous refrigerant to the outdoor heat exchanger for treatment, and the outdoor heat exchanger converts the gaseous refrigerant into the liquid refrigerant, so that the heat is dissipated to the environment at the moment, and the defrosting effect is realized.

Taking fig. 3 as an example for illustration, when the current target operation mode is the oil return mode or the defrosting mode, the state of the first switch is controlled to be adjusted to the first state, and the state of the fourth switch is controlled to be switched to the fourth state. At this time, the DC port of the first switch 5 is connected to the ES port, and the DC port of the second switch 6 is connected to the ES port, so that after the refrigerant flowing out of the compressor 3 flows into the outdoor heat exchanger 4 for treatment, a part of the refrigerant flows into the first heat exchange unit 7, another part of the refrigerant flows into the second heat exchange unit 8, and the refrigerant flowing out of the first heat exchange unit 7 and the second heat exchange unit 8 flows back into the compressor 3 through the first air pipe 25 and the second air pipe 26, respectively.

In a specific implementation, optionally, the first heat exchange unit includes one heat exchanger or a plurality of heat exchangers connected in parallel. When the first heat exchange unit is a plurality of heat exchangers which are communicated in parallel, the refrigerant flowing to the first heat exchange unit is split into a plurality of heat exchangers which are communicated in parallel, so that the plurality of heat exchangers synchronously perform refrigeration or heating.

In this embodiment, the compressor is disposed in the fresh air system, and the first switcher and/or the second 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 exchange unit in the air supply unit performs 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. 4, fig. 4 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 first embodiment, in the control method of the fresh air system of the present embodiment, the fresh air system further includes a first electromagnetic valve and a second electromagnetic valve, and a third heat exchange unit is further disposed in the air supply unit;

After the step S10, the method further includes:

step S30: and controlling the opening and closing states of the first electromagnetic valve and/or the second electromagnetic valve according to the target operation mode.

It should be understood that the flow direction of the refrigerant in the air supply unit and the air exhaust unit is adjusted by controlling the opening and closing state of the first electromagnetic valve and/or the second electromagnetic valve. The first electromagnetic valve divides the refrigerant flowing from the outdoor heat exchanger to the second heat exchange unit when in an opening state, so that a part of the refrigerant flows to the third heat exchange unit, and separates the refrigerant flowing in the third heat exchange unit from the refrigerant flowing in the second heat exchange unit when in a closing state; the second electromagnetic valve is used for dividing the refrigerant flowing to the first heat exchange unit and the third heat exchange unit when in an opening state, converging the refrigerant flowing out of the first heat exchange unit and the third heat exchange unit, and separating the refrigerant flowing in the first heat exchange unit and the third heat exchange unit when in a closing state.

It should be noted that, be equipped with first heat transfer unit and third heat transfer unit in the air supply unit in this embodiment, promoted refrigeration heating efficiency on the one hand, on the other hand, combine new trend system adjustment refrigerant flow direction through first solenoid valve and second solenoid valve for first heat transfer unit and third heat transfer unit can realize dehumidification reheat function, have richened new trend system function, have promoted user experience.

When the target operation mode is the refrigeration mode, referring to fig. 5, fig. 5 is a schematic diagram of a first mode of the fresh air system according to a second embodiment of the control method of the fresh air system of the present invention; the fresh air system of this embodiment is provided with a first electromagnetic valve 9 and a second electromagnetic valve 10, and a first heat exchange unit 7 and a third heat exchange unit 11 are arranged in the air supply unit 1. The state of the first switcher 5 is controlled to be adjusted to be in a first state (namely DC passage port communication and ES passage port communication), the state of the second switcher 6 is switched to be in a third state (namely DE passage port communication and SC passage port communication), the first electromagnetic valve 9 is controlled to be in a closed state, and the second electromagnetic valve 10 is controlled to be in an open state, so that the first heat exchange unit 7 and the third heat exchange unit 11 both perform refrigeration, and fresh air blown by an air supply fan is refrigerated, so that the indoor environment temperature is regulated.

When the target operation mode is a heating mode, referring to fig. 6, fig. 6 is a schematic diagram of a second mode of the fresh air system according to a second embodiment of the control method of the fresh air system of the present invention; the state of the first switcher 5 is controlled to be adjusted to be in a second state (namely, DE passage port communication and SC passage port communication), the state of the second switcher 6 is switched to be in a fourth state (namely, DC passage port communication and ES passage port communication), the first electromagnetic valve 9 is controlled to be in a closed state, and the second electromagnetic valve 10 is controlled to be in an open state, so that the first heat exchange unit 7 and the third heat exchange unit 11 are both heated, and fresh air blown by an air supply fan is heated, so that the indoor environment temperature is regulated.

When the target operation mode is the oil return mode or the defrosting mode, referring to fig. 7, fig. 7 is a schematic diagram of a third mode of the fresh air system according to the second embodiment of the control method of the fresh air system of the present invention; the state of the first switcher 5 is controlled to be adjusted to be in a first state (namely, the DC passage port is communicated and the ES passage port is communicated), the state of the second switcher 6 is switched to be in a fourth state (namely, the DC passage port is communicated and the ES passage port is communicated), the first electromagnetic valve 9 is controlled to be in a closed state, the second electromagnetic valve 10 is controlled to be in an open state, the first heat exchange unit 7, the third heat exchange unit 11 and the second heat exchange unit 8 are refrigerated, and the gaseous refrigerants converted by the three are all flowed back to the compressor 3, so that an oil return effect is realized, and meanwhile, the outdoor heat exchanger 4 is heated, so that a defrosting effect is realized.

Optionally, the step S20 includes: 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 back to the compressor after sequentially passing through the outdoor heat exchanger and the first heat exchange unit; controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the second heat exchange unit and the first heat exchange unit;

The step S30 includes: and controlling the state of the first electromagnetic valve to be an opening state and the state of the second electromagnetic valve to be a closing state according to the dehumidification reheating mode so as to enable the refrigerant flowing from the exhaust port of the compressor to the second heat exchange unit to be split into the third heat exchange unit for heating.

It should be noted that, in this embodiment, the second end of the third heat exchange unit and the second end of the second heat exchange unit are connected by controlling the state of the first electromagnetic valve to be an open state; the state of the second electromagnetic valve is controlled to be in a closed state, so that the communication relationship between the second end of the first heat exchange unit and the second end of the third heat exchange unit is disconnected. By controlling the states of the first switcher, the second switcher, the first electromagnetic valve and the second electromagnetic valve, the refrigerant flows through a sixth loop, a seventh loop and an eighth loop, wherein the sixth loop is a compressor, an outdoor heat exchanger, a first heat exchange unit, a compressor, the seventh loop is a compressor, a third heat exchange unit, a first heat exchange unit, a compressor, the eighth loop is a compressor, a second heat exchange unit, a first heat exchange unit and a compressor. In this embodiment, a part of the refrigerant flowing out of the compressor flows to the first heat exchange unit through the outdoor heat exchanger, is processed by the first heat exchange unit and flows back to the compressor, and another part flows to the third heat exchange unit and the second heat exchange unit, and the refrigerant flowing out of the third heat exchange unit and the second heat exchange unit flows back to the compressor through the first third heat exchange unit.

When the target operation mode is a dehumidification reheat mode, referring to fig. 8, fig. 8 is a schematic diagram of a fourth mode of the fresh air system according to a second embodiment of the control method of the fresh air system of the present invention; the state of the first switcher 5 is controlled to be adjusted to be in a first state (namely DC passage port communication and ES passage port communication), the state of the second switcher 6 is switched to be in a third state (namely DE passage port communication and SC passage port communication), the first electromagnetic valve 9 is controlled to be in an open state, and the second electromagnetic valve 10 is controlled to be in a closed state, so that the third heat exchange unit 11 heats and the first heat exchange unit 7 refrigerates, and the dehumidification and reheating effects are realized. Further, in this embodiment, the check valve 27 is provided to control the flow direction of the refrigerant to flow from the second end of the second heat exchange unit 8 into the third heat exchange unit 11, so that the third heat exchange unit 11 heats, 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 first switcher, the second switcher, the first electromagnetic valve and/or the second electromagnetic valve are controlled according to the target operation mode, so that the flow direction of the refrigerant in the system is switched, on one hand, the first heat exchange unit and the third heat exchange unit in the air supply unit can be controlled to perform refrigeration or heating simultaneously, the indoor air temperature is adjusted, active refrigeration and heating of the fresh air system are realized, and on the other hand, the first heat exchange unit in the air supply unit can be controlled to perform refrigeration and the third heat exchange unit is controlled to perform heating, and the dehumidification and reheating effects are realized.

Referring to fig. 9, fig. 9 is a schematic flow chart of a third embodiment of a control method of the fresh air system of the present invention.

Based on the second embodiment, in the control method of the fresh air system of the present embodiment, the fresh air system further includes 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:

step S40: 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 appreciated that the control demand corresponding to the target operating mode is determined based on a target value or target intensity set by the user, for example, in the cooling mode, the control demand is determined based on a temperature value set by the user.

It should be noted that, the opening degrees of the throttle mechanisms controlled by different operation modes are different, alternatively, the first throttle mechanism, the second throttle mechanism, the third throttle mechanism and the fourth throttle mechanism are electronic expansion valves, and the opening degrees of the electronic expansion valves are controlled to control the refrigerant flow rate, referring to fig. 10, fig. 10 is a schematic diagram of a fresh air system in a third embodiment of the control method of the fresh air system of the present invention; in the cooling mode, the DC port communication and the ES port communication of the first switch 5 are controlled, the DE port communication and the SC port communication of the second switch 6 are controlled, the first solenoid valve 9 is controlled to be in a closed state, the second solenoid valve 10 is controlled to be in an open state, the first throttle mechanism 12 is controlled to throttle (the specific opening is determined according to the control requirement), the second throttle mechanism 13 is controlled to throttle (the specific opening is determined according to the control requirement), the third throttle mechanism 14 is fully opened, and the fourth throttle mechanism 15 is fully opened.

Referring to fig. 10, in the heating mode, the DE port communication and the SC port communication of the first switch 5, the DC port communication and the ES port communication of the second switch 6, the first solenoid valve 9, the second solenoid valve 10, the first throttle mechanism 12, the second throttle mechanism 13, the third throttle mechanism 14 and the fourth throttle mechanism 15 are controlled to be opened and closed, respectively.

Referring to fig. 10, in the oil return mode or the defrosting mode, the DC port communication and the ES port communication of the first switch 5, the DC port communication and the ES port communication of the second switch 6, the first solenoid valve 9, the second solenoid valve 10, the first throttle mechanism 12 (the specific opening degree is determined according to the control requirement), the second throttle mechanism 13 (the specific opening degree is determined according to the control requirement), the third throttle mechanism 14 (the specific opening degree is determined according to the control requirement), and the fourth throttle mechanism 15 are all opened.

Referring to fig. 10, in the dehumidification reheat mode, the DC port communication and the ES port communication of the first switch 5 are controlled, the DE port communication and the SC port communication of the second switch 6 are controlled, the first solenoid valve 9 is controlled to be in an open state, the second solenoid valve 10 is controlled to be in a closed state, the first throttle mechanism 12 is controlled to throttle (the specific opening degree is determined according to the control requirement), the second throttle mechanism 13 is fully opened, the third throttle mechanism 14 is fully opened, and the fourth throttle mechanism 15 is fully opened.

In this embodiment, a compressor is disposed in the fresh air system, and the first switcher, the second switcher, the first electromagnetic valve and/or the second electromagnetic valve are controlled according to a target operation mode, so that the flow direction of the refrigerant in the system is switched, and the opening degrees of the first throttle mechanism, the second throttle mechanism, the third throttle mechanism and the fourth throttle mechanism are adjusted according to the control requirement corresponding to the target operation mode, so that the refrigerating capacity or the heating capacity is adjusted according to the control requirement, the functions of fresh air, refrigeration, heating, dehumidification and reheating, oil return, defrosting and the like are realized, and meanwhile, the indoor exhaust heat is recovered by the exhaust unit through the second heat exchange unit, and the operation efficiency of the whole machine is improved.

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. 11, fig. 11 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. 11, in the control device of the fresh air system provided by the embodiment of the invention, the fresh air system comprises an air supply unit, an air exhaust unit, a compressor, an outdoor heat exchanger, a first switcher and a second switcher, wherein the air supply unit is internally provided with a first heat exchange unit, and the air exhaust unit is internally provided with a second heat exchange unit;

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 switch and/or the second switch 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.

Optionally, the control module 20 is further configured to control, when the target operation mode is a cooling mode, a state of the first switch so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the outdoor heat exchanger and the first heat exchange unit; and controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the second heat exchange unit and the first heat exchange unit.

Optionally, the control module 20 is further configured to control, when the target operation mode is a heating mode, a state of the first switch so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the first heat exchange unit and the outdoor heat exchanger; and controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the first heat exchange unit and the second heat exchange unit.

Optionally, the control module 20 is further configured to control a state of the first switch when the target operation mode is an oil return mode or a defrosting mode, so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the outdoor heat exchanger and the first heat exchange unit; and controlling the state of the second switcher so that the refrigerant discharged from the exhaust port of the compressor flows back to the compressor after sequentially passing through the outdoor heat exchanger and the second heat exchange unit.

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 and a second switcher, wherein the air supply unit is internally provided with a first heat exchange unit, and the air exhaust unit is internally provided with a second heat exchange unit;

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

determining a target operation mode of the fresh air system; and

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

5. The control method of a fresh air system according to claim 1, wherein the fresh air system further comprises a first electromagnetic valve and a second electromagnetic valve, and a third heat exchange unit is further arranged in the air supply unit;

6. The method for controlling a fresh air system according to claim 5, wherein the controlling the first switch and/or the second switch according to the target operation mode includes:

7. The method of controlling a fresh air system of claim 6, wherein the fresh air system further comprises a first throttling mechanism, a second throttling mechanism, a third throttling mechanism, and a fourth throttling mechanism;

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 and a second switcher, wherein the air supply unit is internally provided with a first heat exchange unit, and the air exhaust unit is internally provided with a second heat exchange unit;

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 and a second switcher, wherein the air supply unit is internally provided with the first heat exchange unit, and the air exhaust unit is internally provided with the second heat exchange 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 solenoid valve and a second solenoid valve, wherein the air supply unit is further provided with a third heat exchange unit;