CN115435398B - Air conditioning unit and control method - Google Patents

Abstract

The invention relates to the technical field of air conditioner control, in particular to an air conditioner unit and a control method. The air conditioning unit comprises a main loop and a control module, wherein the main loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger which are sequentially communicated into a loop, the first indoor heat exchanger is used for receiving first mixed air to perform heat exchange treatment, the second indoor heat exchanger is used for receiving second mixed air to perform heat exchange treatment and outputting air to the indoor, and the control module is used for regulating and controlling the refrigerant flow of the first indoor heat exchanger and the second indoor heat exchanger and the mode of heat exchange treatment according to environmental information. The invention realizes the execution and control of multiple working modes through one unit mechanism, sets a serial hierarchical heat exchange structure and multiple air mixing treatments, reasonably utilizes the air with different grade sources to carry out sectional mixing treatment, is more beneficial to reducing condensation temperature and improving supercooling degree, and overcomes the defect of high electricity consumption by adopting an electric reheating temperature regulation and hot gas parallel shunting reheating mode after dehumidification.

Description

Air conditioning unit and control method

Technical Field

The present invention relates to the technical field of air conditioning control, and in particular to an air conditioning unit and a control method.

Background Art

In the prior art, air conditioning units have a single function, and expanding multiple modes requires additional functional segments or equipment, resulting in problems such as high energy consumption, waste of resources, and environmental pollution. At the same time, the various working modes of air conditioning units also have at least the following defects:

1. In the constant temperature and humidity mode, the electric reheating method of single return air treatment is mostly adopted. Even if the secondary return air method is adopted, the air volume of the dehumidification heat exchanger is constant. When the indoor heat and humidity load is constantly changing due to internal and external factors, the constant air volume method has the energy consumption problems of transitional refrigeration consumption and transitional reheating. In order to solve the above-mentioned reheating energy consumption problem, the existing technology adopts the condensation heat recovery of parallel condensers to solve it. The high-temperature superheated steam is distributed to the indoor reheating through the refrigerant three-way valve and double expansion valve instead of the refrigerant three-way valve or double four-way valve, solenoid valve, etc. The parallel condenser method uses high-temperature superheated steam, which sacrifices the opportunity to use the indoor high-grade low-temperature air source to achieve cascade heat recovery to obtain lower condensing temperature and greater supercooling. At the same time, the heat and humidity treatment air volume in the constant temperature and humidity mode does not adjust adaptively with the change of heat and humidity load, resulting in further increase in energy consumption.

2. The temperature and humidity controlled air supply mode, the humidity content and temperature of the air supply are adjustable. The existing technology adopts a multi-system combination design, which not only sets up a cooling and dehumidification system, but also sets up a step-by-step temperature control dehumidification system and a combination system of air-cooled and water-cooled condensers to form a full-condition dehumidification unit. This type of multi-system arrangement and combination has blind spots in operating conditions, and it is difficult to achieve continuous and independent adjustment of the humidity content and the air outlet temperature.

3. In the heating operation mode, the designed air volume and heat exchange area on the indoor side are less than those on the outdoor side. When the return air temperature is high, the heating operation temperature is controlled at around 26°C, which is relatively limited when further heating is needed indoors. In winter, the fresh air temperature is too low, and constant air volume is required to purify the room to maintain cleanliness. Excessive air volume passing through the indoor condenser will cause over-condensation, and a fresh air electric preheating device is often required to increase the inlet air temperature to ensure the normal operation of the system. Therefore, the operating temperature range inside the heat pump is relatively limited and the preheating device is very energy-consuming.

Summary of the invention

The purpose of the present invention is to provide an air conditioning unit and a control method, aiming to realize the execution and control of multiple working modes through the same air conditioning unit, so as to achieve the most energy-saving operation in different indoor and outdoor working conditions.

In a first aspect, an air conditioning unit is provided, comprising:

A main circuit, the main circuit comprising a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger connected in sequence to form a circuit, the first indoor heat exchanger is used to receive the first mixed air for heat exchange processing, and the second indoor heat exchanger is used to receive the second mixed air for heat exchange processing and discharge air to the room;

A control module, the control module is used to adjust the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger according to environmental information;

Among them, the first mixed air is a mixture of outdoor fresh air and indoor return air, the second mixed air is a mixture of outlet air of the first indoor heat exchanger and indoor return air, the environmental information includes indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger, outlet air temperature, outlet air humidity and/or outdoor temperature, and the heat exchange processing mode includes heat and humidity processing, equal moisture content heating processing and/or heating processing.

In some embodiments, the air conditioning unit further comprises:

A first temperature and humidity sensor, used to obtain indoor temperature and indoor humidity;

An outlet temperature sensor, used to obtain the outlet temperature of the first indoor heat exchanger;

The mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information includes:

Based on the indoor temperature, the indoor humidity and the outlet temperature of the first indoor heat exchanger, control the first indoor heat exchanger to receive the first mixed air for heat and humidity treatment, and control the second indoor heat exchanger to receive the second mixed air for equal humidity heating treatment and discharge air into the room;

The air conditioning unit is in a cooling state.

In some embodiments, the air conditioning unit further comprises:

The second temperature and humidity sensor is used to obtain the outlet air temperature and outlet air humidity;

An outlet temperature sensor, used to obtain the outlet temperature of the first indoor heat exchanger;

The mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information includes:

Based on the outlet air temperature, the outlet air humidity and the outlet temperature of the first indoor heat exchanger, controlling the first indoor heat exchanger to receive the first mixed air for heat and humidity treatment, and controlling the second indoor heat exchanger to receive the second mixed air for equal humidity heating treatment and discharge air into the room;

The air conditioning unit is in a cooling state.

In some embodiments, the air conditioning unit further comprises:

The mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information includes:

Based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger to receive the first mixed air for heating, and controlling the second indoor heat exchanger to receive the second mixed air for heating and discharge air into the room;

The air conditioning unit is in a heating state.

In some embodiments, the air conditioning unit further comprises:

An indoor unit, wherein the indoor unit is provided with a first cavity for arranging the first indoor heat exchanger and a second cavity for arranging the second indoor heat exchanger;

The first cavity is provided with a fresh air valve, a first return air valve and a second return air valve;

The second cavity is provided with a first air inlet valve and a second air inlet valve, and the second cavity is connected with the first cavity through the first air inlet valve and the second air inlet valve;

The outdoor fresh air introduced by the fresh air valve and the indoor return air introduced by the first return air valve form the first mixed air, the outlet air of the first indoor heat exchanger and the indoor return air introduced by the second return air valve form the second mixed air, and the outlet air of the second indoor heat exchanger and the second mixed air introduced by the first air inlet valve form the third mixed air;

The control module is used to control the opening of the first return air valve, the second return air valve, the first inlet air valve and the second inlet air valve respectively.

In some embodiments, when the air conditioning unit is in a heating state, the refrigerant output by the compressor flows sequentially through the four-way valve, the first indoor heat exchanger, the second indoor heat exchanger and the outdoor heat exchanger, and the refrigerant output by the outdoor heat exchanger flows back to the compressor through the four-way valve;

When the air-conditioning unit is in a cooling state, the refrigerant output by the compressor flows sequentially through the four-way valve, the outdoor heat exchanger, the second indoor heat exchanger and the first indoor heat exchanger, and the refrigerant output by the first indoor heat exchanger flows back to the compressor through the four-way valve.

In a second aspect, a control method for an air conditioning unit is provided, comprising:

Obtain environmental information;

regulating the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information;

Wherein, the air-conditioning unit includes a main circuit, and the main circuit includes a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger which are connected in sequence to form a circuit, the first indoor heat exchanger is used to receive the first mixed air for heat exchange processing, and the second indoor heat exchanger is used to receive the second mixed air for heat exchange processing and discharge air to the indoor room; the first mixed air is a mixture of outdoor fresh air and indoor return air, and the second mixed air is a mixture of the outlet air of the first indoor heat exchanger and the indoor return air, the environmental information includes indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger, outlet air temperature, outlet air humidity and/or outdoor temperature, and the heat exchange processing mode includes heat and humidity processing, equal moisture content heating processing and/or heating processing.

In some embodiments, the mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger and the second indoor heat exchanger in the air-conditioning unit according to the environmental information includes:

Based on the indoor temperature, the indoor humidity and the outlet temperature of the first indoor heat exchanger, control the first indoor heat exchanger to receive the first mixed air for heat and humidity treatment, and control the second indoor heat exchanger to receive the second mixed air for equal humidity heating treatment and discharge air into the room;

The air conditioning unit is in a cooling state.

In some embodiments, the mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger and the second indoor heat exchanger in the air-conditioning unit according to the environmental information includes:

Based on the outlet air temperature, the outlet air humidity and the outlet temperature of the first indoor heat exchanger, controlling the first indoor heat exchanger to receive the first mixed air for heat and humidity treatment, and controlling the second indoor heat exchanger to receive the second mixed air for equal humidity heating treatment and discharge air into the room;

The air conditioning unit is in a cooling state.

In some embodiments, the mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger and the second indoor heat exchanger in the air-conditioning unit according to the environmental information includes:

Based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger to receive the first mixed air for heating, and controlling the second indoor heat exchanger to receive the second mixed air for heating and discharge air into the room;

The air conditioning unit is in a heating state.

The beneficial effects of the present invention are as follows: the execution and control of multiple working modes are realized through one unit mechanism, a series-layered heat exchange structure and multiple air mixing treatments are set, and air from different quality sources is rationally utilized for segmented mixing treatment, which is more conducive to further reducing the condensation temperature and further improving the supercooling degree, thereby improving the air conditioning energy efficiency, overcoming the defects of high power consumption of the electric reheating temperature control method and the hot gas parallel shunt reheating method after dehumidification, and saving cooling consumption.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of an air conditioning unit provided in an embodiment of the present disclosure.

FIG. 2 is a flow chart of a control method for an air conditioning unit provided in an embodiment of the present disclosure.

DETAILED DESCRIPTION

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and/or" used herein includes any and all combinations of one or more related listed items.

As shown in FIG1 , an air conditioning unit according to an embodiment of the present invention comprises a main circuit and a control module, wherein the main circuit comprises a compressor 100, a four-way valve 200, an outdoor heat exchanger 300, a second indoor heat exchanger 500 and a first indoor heat exchanger 400 which are connected in sequence to form a circuit, the first indoor heat exchanger 400 is used to receive the first mixed air for heat exchange processing, the second indoor heat exchanger 500 is used to receive the second mixed air for heat exchange processing and discharge air indoors, and the control module is used to control the refrigerant flow and the heat exchange processing mode of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 according to environmental information. The first mixed air is a mixed air of outdoor fresh air and indoor return air, the second mixed air is a mixed air of the outlet air of the first indoor heat exchanger 400 and the indoor return air, the environmental information comprises indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger 400, outlet air temperature, outlet air humidity and/or outdoor temperature, and the heat exchange processing mode comprises heat and humidity processing, equal moisture content heating processing and/or heating processing.

Specifically, by configuring sensors at corresponding positions to collect environmental information, the collected environmental information is sent to the control module. The type of environmental information obtained by the control module regulates the refrigerant flow rate and the heat exchange processing mode of the first indoor heat exchanger 400 and the second indoor heat exchanger 500. At the same time, the control module controls the air conditioning unit to be in a cooling state or a heating state. Under the control of the control module, the control module sets the refrigerant flow rate and the heat exchange processing mode of the first indoor heat exchanger 400 and the second indoor heat exchanger 500. The heat exchange processing mode of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 includes one of heat and humidity processing, equal humidity content heating processing and heating processing. The outdoor fresh air and the indoor return air are mixed for the first time to form a first mixed air. The first indoor heat exchanger 400 receives the first mixed air for heat exchange processing. The outlet air of the heat exchange processing of the first indoor heat exchanger 400 is mixed with the indoor return air for the second time to form a second mixed air. The second indoor heat exchanger 500 receives the second mixed air for heat exchange processing. The outlet air of the heat exchange processing of the second indoor heat exchanger 500 is discharged indoors. The above process is continuously and repeatedly cycled, and the execution and control of various working modes are realized through the hierarchical heat exchange processing and heat exchange mode conversion of the first indoor heat exchanger 400 and the second indoor heat exchanger 500.

Referring to FIG. 1 again, the exhaust end of the compressor 100 is connected to an oil separator 610, the oil outlet end of the oil separator 610 is connected to the crankcase of the compressor 100, the gas outlet end of the oil separator 610 is connected to the outdoor heat exchanger 300 through the four-way valve 200, the first end of the four-way valve 200 is connected to the oil separator 610, the second end of the four-way valve 200 is connected to the outdoor heat exchanger 300, the third end of the four-way valve 200 is connected to the gas-liquid separator 620, the third end of the four-way valve 200 is connected to the return end of the compressor 100 through the gas-liquid separator 620, the fourth end of the four-way valve 200 is connected to the first stop valve 630, and the outdoor One end of the heat exchanger 300 is connected to the second stop valve 640, and the end of the second stop valve 640 away from the outdoor heat exchanger 300 is respectively connected to one end of the second indoor heat exchanger 500 and a flow regulating valve 650, and the other end of the second indoor heat exchanger 500 and the end of the flow regulating valve 650 away from the outdoor heat exchanger 300 are sequentially connected to an electronic expansion valve 660 and a liquid distributor 670, and the end of the liquid distributor 670 away from the electronic expansion valve 660 is connected to one end of the first indoor heat exchanger 400, and the other end of the first indoor heat exchanger 400 is connected to the fourth end of the four-way valve 200 through the first stop valve 630.

When the air-conditioning unit is in the heating state, the refrigerant output by the compressor 100 flows through the four-way valve 200, the first indoor heat exchanger 400, the second indoor heat exchanger 500 and the outdoor heat exchanger 300 in sequence, and the refrigerant output by the outdoor heat exchanger 300 flows back to the compressor 100 through the four-way valve 200; when the air-conditioning unit is in the cooling state, the refrigerant output by the compressor 100 flows through the four-way valve 200, the outdoor heat exchanger 300, the second indoor heat exchanger 500 and the first indoor heat exchanger 400 in sequence, and the refrigerant output by the first indoor heat exchanger 400 flows back to the compressor 100 through the four-way valve 200.

In the cooling state, the refrigerant is pressurized and discharged from the compressor 100 as high-temperature, high-pressure, and superheated gas, and is separated from the lubricating oil by the oil separator 610. The separated lubricating oil is filtered out of impurities in the oil by the filter and then returns to the crankcase of the compressor 100 through the capillary pressure reduction and flow limiting. The high-temperature and superheated refrigerant after oil separation flows to the outdoor heat exchanger 300 through the second end of the four-way valve 200, and is condensed into a supercooled liquid after heat dissipation and cooling in the outdoor heat exchanger 300. A part of the refrigerant output by the outdoor heat exchanger 300 flows to the second indoor heat exchanger through the second stop valve 640. 500 is subjected to secondary supercooling, and the second mixed air passing through the second indoor heat exchanger 500 is heated. The other part passes through the second stop valve 640 and then passes to the flow regulating valve 650 as a bypass. After the two parts of refrigerant merge, they enter the electronic expansion valve 660 for throttling and cooling. Then, the refrigerant is output to the first indoor heat exchanger 400 through the liquid separator 670 to absorb the internal heat of the first indoor heat exchanger 400. The refrigerant output by the first indoor heat exchanger 400 passes through the first stop valve 630, the four-way valve 200, and the gas-liquid separator 620 and then returns to the compressor 100. The above process is continuously repeated and circulated, thereby achieving indoor heating.

In the heating state, the refrigerant is pressurized and discharged from the compressor 100 as high-temperature, high-pressure, and superheated gas. After the lubricating oil is separated by the oil separator 610, impurities in the oil are filtered out by the filter. The separated lubricating oil is filtered out by the filter and then returns to the crankcase of the compressor 100 through the capillary tube for decompression and flow limiting. The high-temperature, superheated refrigerant after oil separation flows out through the fourth end of the four-way valve 200, flows to the first indoor heat exchanger 400 through the first stop valve 630, and condenses to form a high-temperature liquid. The heating output of the first indoor heat exchanger 400 The refrigerant enters the one-way valve 680 through the liquid separator 670. A part of the refrigerant outputted from the one-way valve 680 enters the second indoor heat exchanger 500 for further condensation, and the other part passes through the flow regulating valve 650 as a bypass. After the two parts of the refrigerant merge, they enter the outdoor heat exchanger 300 through the second stop valve 640 for evaporation and heat absorption to become superheated steam. The refrigerant outputted from the outdoor heat exchanger 300 flows to the gas-liquid separator 620 through the third end of the four-way valve 200, and finally flows back to the compressor 100 through the gas-liquid separator 620. The above process is continuously repeated and circulated, thereby achieving indoor cooling.

Referring to FIG. 1 again, the air conditioning unit further includes an indoor unit 700 , and the indoor unit 700 is provided with a first cavity 710 for arranging the first indoor heat exchanger 400 and a second cavity 720 for arranging the second indoor heat exchanger 500 . The first cavity 710 is provided with a fresh air valve 730, a first return air valve 740 and a second return air valve 750; the second cavity 720 is provided with a first inlet air valve 760 and a second inlet air valve 770, and the second cavity 720 is connected to the first cavity 710 through the first inlet air valve 760 and the second inlet air valve 770; the outdoor fresh air introduced by the fresh air valve 730 and the indoor return air introduced by the first return air valve 740 form a first mixed air, the outlet air of the first indoor heat exchanger 400 and the indoor return air introduced by the second return air valve 750 form a second mixed air, and the outlet air of the second indoor heat exchanger 500 and the second mixed air introduced by the first inlet air valve 760 form a third mixed air; the control module is used to control the opening of the first return air valve 740, the second return air valve 750, the first inlet air valve 760 and the second inlet air valve 770 respectively.

Specifically, the fresh air valve 730 is used to introduce outdoor fresh air into the first cavity 710, the first return air valve 740 and the second return air valve 750 are respectively used to introduce indoor return air into the first cavity 710, the first air inlet valve 760 and the second air inlet valve 770 are respectively used to introduce the second mixed air into the second cavity 720, and the second indoor heat exchanger 500 receives the second mixed air through the second air inlet valve 770. When the second indoor heat exchanger 500 discharges air to the room, the outlet air of the second indoor heat exchanger 500 and the second mixed air introduced by the first air inlet valve 760 form a third mixed air and then discharges air to the room.

More specifically, the hierarchical heat exchange process of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 in this embodiment is mixed three times before finally discharging air to the room. The first air mixing is to introduce outdoor fresh air through the fresh air valve 730 and indoor return air through the first return air valve 740 for mixing. The second air mixing is to mix the output air of the first indoor heat exchanger 400 and the indoor return air through the second return air valve 750. The third air mixing is to mix the output air of the second indoor heat exchanger 500 and the second mixed air introduced by the first air inlet valve 760. During the air mixing process, the control module controls the opening of the first return air valve 740, the second return air valve 750, the first air inlet valve 760 and the second air inlet valve 770 respectively, and controls the air volume ratio of the first mixed air, the second mixed air and the third mixed air. The opening adjustment logic of the first return air valve 740 is opposite to that of the second return air valve 750, and the opening adjustment logic of the first inlet air valve 760 is opposite to that of the second inlet air valve 770, that is, when the opening of the first return air valve 740 is increased, the opening of the second return air valve 750 is decreased, and when the opening of the first return air valve 740 is decreased, the opening of the second return air valve 750 is increased, when the opening of the first inlet air valve 760 is increased, the opening of the second inlet air valve 770 is decreased, and when the opening of the first inlet air valve 760 is decreased, the opening of the second inlet air valve 770 is increased.

In some embodiments, the air conditioning unit further includes a first temperature and humidity sensor 810 and an outlet temperature sensor 850, wherein the first temperature and humidity sensor 810 is used to obtain the indoor temperature and indoor humidity, and the outlet temperature sensor 850 is used to obtain the outlet temperature of the first indoor heat exchanger 400; the mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 according to the environmental information includes: based on the indoor temperature, indoor humidity and the outlet temperature of the first indoor heat exchanger 400, controlling the first indoor heat exchanger 400 to receive outdoor fresh air and indoor return air for heat and humidity processing, and controlling the second indoor heat exchanger 500 to receive the outlet air and indoor return air of the first indoor heat exchanger 400 for equal moisture content heating processing and discharge air to the room. The air conditioning unit is in a cooling state.

Specifically, outdoor fresh air is introduced through the fresh air valve 730 and indoor return air is introduced through the first return air valve 740 whose opening is controlled by the control module to form a first mixed air. The first indoor heat exchanger 400 receives the first mixed air for heat and humidity treatment. The outlet air of the first indoor heat exchanger 400 is mixed for a second time with the indoor return air of the second return air valve 750 whose opening is controlled by the control module to form a second mixed air. The second mixed air enters the second cavity 720 through the first air inlet valve 760 and the second air inlet valve 770 whose opening is controlled by the control module respectively. The opening of the first air inlet valve 760 and the second air inlet valve 770 are controlled by the control module. The opening degree of 70 is adjusted based on the outlet temperature of the first indoor heat exchanger 400. The second mixed air passing through the first air inlet valve 760 directly enters the second cavity 720, and the second mixed air passing through the second air inlet valve 770 enters the second indoor heat exchanger 500 for equal moisture content heating treatment. The outlet air of the second indoor heat exchanger 500 is mixed for the third time with the second mixed air passing through the first air inlet valve 760 to obtain the third mixed air. The air outlet of the second cavity 720 is provided with an air outlet fan 780. After receiving the third mixed air, the air outlet fan 780 discharges air to the room through the air outlet of the second cavity 720.

Under the control of the control module, the above process is continuously cyclically operated. The control module takes constant indoor temperature and indoor humidity as the adjustment target, and controls the opening of the first return air valve 740, the second return air valve 750, the first air inlet valve 760 and the second air inlet valve 770, as well as the refrigerant input flow of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 respectively. The first indoor heat exchanger 400 receives outdoor fresh air and indoor return air for heat and humidity treatment, and the second indoor heat exchanger 500 receives the outlet air and indoor return air of the first indoor heat exchanger 400 for equal moisture content heating treatment. The second indoor heat exchanger 500 serves as a reheat condenser. By connecting the first indoor heat exchanger 400 in series with the second indoor heat exchanger 500, a lower condensing temperature and a greater degree of supercooling can be further obtained while meeting the reheat demand, thereby achieving the indoor constant temperature and humidity regulation effect.

Furthermore, the control module adjusts the reheating amount by controlling the opening of the first air inlet valve 760 and the second air inlet valve 770. When reheating is needed, the refrigerant flow of the first indoor heat exchanger 400 is adjusted first, and then the opening of the first air inlet valve 760 and the second air inlet valve 770 is adjusted. When the heat is still insufficient when the second air inlet valve 770 is fully opened, the fan of the outdoor heat exchanger 300 is adjusted to reduce the frequency of the fan of the outdoor heat exchanger 300, so as to transfer more refrigerant heat to the second indoor heat exchanger 500 for dissipation, thereby realizing continuous adjustment of the reheating amount.

Preferably, the refrigerant input flow regulation of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 can be achieved by adjusting the opening of the second stop valve 640, the flow regulating valve 650 and the electronic expansion valve 660, and the air intake volume regulation of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 can be achieved by limiting the air volume at the air inlet of the first indoor heat exchanger 400 and the second indoor heat exchanger 500.

In some embodiments, the air conditioning unit further includes a second temperature and humidity sensor 820 and an outlet temperature sensor 850, the second temperature and humidity sensor 820 is used to obtain the outlet temperature and outlet humidity, and the outlet temperature sensor 850 is used to obtain the outlet temperature of the first indoor heat exchanger 400; the mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 according to the environmental information includes: based on the outlet temperature, outlet humidity and outlet temperature of the first indoor heat exchanger 400, controlling the first indoor heat exchanger 400 to receive outdoor fresh air and indoor return air for heat and humidity processing, and controlling the second indoor heat exchanger 500 to receive the outlet air and indoor return air of the first indoor heat exchanger 400 for equal moisture content heating processing and discharge air to the room. The air conditioning unit is in cooling state.

The difference from the above embodiment is that the second temperature and humidity sensor 820 is arranged at the air outlet of the second cavity 720, and the controller receives the outlet air temperature and outlet air humidity obtained by the second temperature and humidity sensor 820, and takes constant outlet air temperature and outlet air humidity as the adjustment target, and controls the opening of the first return air valve 740, the second return air valve 750, the first air inlet valve 760 and the second air inlet valve 770 and the refrigerant input flow of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 respectively. The first indoor heat exchanger 400 receives outdoor fresh air and indoor return air for heat and humidity treatment, and the second indoor heat exchanger 500 receives the outlet air and indoor return air of the first indoor heat exchanger 400 for equal moisture content heating treatment, thereby achieving the adjustment effect of constant outlet air temperature and outlet air humidity.

In some embodiments, the mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 according to the environmental information includes: based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger 400 to receive the first mixed air for heating processing, and controlling the second indoor heat exchanger 500 to receive the second mixed air for heating processing and discharge air to the room. The air conditioning unit is in a heating state.

Referring to FIG. 1 again, a first pressure sensor 830 is provided at the exhaust end of the compressor 100, and a second pressure sensor 840 is provided at the return air end of the compressor 100. This embodiment measures the heat load of the air-conditioning unit by the return air temperature, the first pressure information collected by the first pressure sensor 830, and the second pressure information collected by the second pressure sensor 840.

Outdoor fresh air is introduced through the fresh air valve 730 and indoor return air is introduced through the first return air valve 740 whose opening is controlled by the control module to form a first mixed air. The first indoor heat exchanger 400 receives the first mixed air for heating treatment. The outlet air of the first indoor heat exchanger 400 is mixed for a second time with the indoor return air of the second return air valve 750 whose opening is controlled by the control module to form a second mixed air. The second mixed air enters the second cavity 720 through the first air inlet valve 760 and the second air inlet valve 770 whose openings are controlled by the control module respectively. The second mixed air passing through the first air inlet valve 760 directly enters the second cavity 720. The second mixed air passing through the second air inlet valve 770 enters the second indoor heat exchanger 500 for heating treatment. The outlet air of the second indoor heat exchanger 500 is mixed for a third time with the second mixed air passing through the first air inlet valve 760 to obtain a third mixed air. The air outlet of the second cavity 720 is provided with an outlet fan 780. After receiving the third mixed air, the outlet fan 780 discharges air to the room through the air outlet of the second cavity 720.

Under the control of the control module, the above process is continuously cycled and adapted to the change of the heat load of the air-conditioning unit to allocate the heating air volume and the heating area. The control module obtains the return air temperature of the air-conditioning unit through the temperature sensor. When the return air temperature is greater than the return air temperature threshold, it is determined whether the ratio of the first pressure information to the second pressure information is greater than the first pressure ratio and whether the second pressure information is greater than the first return air pressure threshold. If both are yes, the compressor 100 is controlled to reduce the frequency. Otherwise, the mixed air ratio of the first mixed air and the mixed air ratio of the second mixed air are adjusted, or the compressor is controlled. 100 frequency increase, so that the heat exchange rate of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 is increased; when the return air temperature is not greater than the return air temperature threshold, it is determined whether the ratio of the first pressure information to the second pressure information is less than the second pressure ratio and whether the second pressure information is less than the second return air pressure threshold. If both are yes, the compressor 100 frequency increase is controlled, otherwise, the mixed air ratio of the first mixed air and the mixed air ratio of the second mixed air are adjusted, or the compressor 100 frequency reduction is controlled to reduce the heat exchange rate of the first indoor heat exchanger 400 and the second indoor heat exchanger 500. Among them, the first pressure ratio is less than the second pressure ratio, and the first return air pressure threshold is less than the second return air pressure threshold.

In some embodiments, the control module controls the second return air valve 750 and the second air inlet valve 770 to be in a closed state, and controls the fresh air valve 730, the first return air valve 740 and the first air inlet valve 760 to be in an open state. The outdoor fresh air and the indoor return air are mixed once and then pass through the first cavity 710 and the second cavity 720 in turn, and are finally output to the room from the outlet of the second cavity 720 under the action of the air outlet fan 780, thereby realizing the ventilation mode.

The air-conditioning unit disclosed in the present invention realizes the execution and control of multiple working modes through one unit mechanism, sets a series hierarchical heat exchange structure and multiple air mixing treatments, rationally utilizes air from different quality sources for segmented mixing treatment, is more conducive to further reducing the condensing temperature and further improving the supercooling degree, thereby improving the air-conditioning energy efficiency, overcoming the defects of high power consumption of the electric reheating temperature control method and the hot gas parallel shunt reheating method during return air, and saving cooling consumption.

As shown in FIG2 , a control method of an air conditioning unit according to an embodiment of the present invention includes:

Step S100, obtaining environmental information;

Step S200: regulating the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger in the air-conditioning unit according to the environmental information.

Among them, the air-conditioning unit includes a main circuit, the main circuit includes a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger which are connected in sequence to form a circuit, the first indoor heat exchanger is used to receive the first mixed air for heat exchange processing, the second indoor heat exchanger is used to receive the second mixed air for heat exchange processing and discharge air to the indoor room; the first mixed air is a mixture of outdoor fresh air and indoor return air, the second mixed air is a mixture of the outlet air of the first indoor heat exchanger and the indoor return air, the environmental information includes indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger, outlet air temperature, outlet air humidity and/or outdoor temperature, the heat exchange processing mode includes heat and humidity processing, equal moisture content heating processing and/or heating processing.

In some embodiments, regulating the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger in the air-conditioning unit according to the environmental information includes:

Based on the indoor temperature, indoor humidity and the outlet temperature of the first indoor heat exchanger, the first indoor heat exchanger is controlled to receive the first mixed air for heat and humidity treatment, and the second indoor heat exchanger is controlled to receive the second mixed air for equal humidity heating treatment and discharge the air into the room;

The air conditioning unit is in cooling state.

In some embodiments, regulating the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger in the air-conditioning unit according to the environmental information includes:

Based on the outlet air temperature and outlet air humidity and the outlet temperature of the first indoor heat exchanger, the first indoor heat exchanger is controlled to receive the first mixed air for heat and humidity treatment, and the second indoor heat exchanger is controlled to receive the second mixed air for equal humidity heating treatment and discharge the air indoors;

The air conditioning unit is in cooling state.

In some embodiments, regulating the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger in the air-conditioning unit according to the environmental information includes:

Based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger to receive the first mixed air for heating, and controlling the second indoor heat exchanger to receive the second mixed air for heating and discharge the air into the room;

The air conditioning unit is in heating mode.

The control method of the air-conditioning unit disclosed in the present invention realizes the execution and control of multiple working modes through one unit mechanism, sets a series hierarchical heat exchange structure and multiple air mixing treatments, and rationally utilizes air from different quality sources for segmented mixing treatment, which is more conducive to further reducing the condensation temperature and further improving the supercooling degree, thereby improving the air-conditioning energy efficiency, overcoming the defects of high power consumption of the electric reheating temperature control method and the hot gas parallel shunt reheating method after dehumidification, and saving cooling consumption.

The control method of the air-conditioning unit provided in the embodiment of the present disclosure realizes the control of the air-conditioning unit of the above embodiment. The specific limitation of the control method of the air-conditioning unit can be found in the above limitation of the air-conditioning unit, which will not be repeated here.

The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the present invention is not limited thereto. The serial numbers of the embodiments of the present invention are for description only and do not represent the advantages and disadvantages of the embodiments. In addition, although the logical order is shown in the flow chart, in some cases, the steps shown or described may be performed in a different order than that shown here.

A person skilled in the art may implement the present invention in a variety of variations without departing from the scope and essence of the present invention, such as using a feature of one embodiment to obtain another embodiment. The preferred embodiments of the embodiments of the present disclosure are described above with reference to the accompanying drawings, but the scope of rights of the embodiments of the present disclosure is not limited thereby. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the embodiments of the present disclosure shall be within the scope of rights of the embodiments of the present disclosure.

Claims (9)

1. An air conditioning unit, comprising: A main circuit, the main circuit comprising a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger connected in sequence to form a circuit, the first indoor heat exchanger is used to receive the first mixed air for heat exchange processing, and the second indoor heat exchanger is used to receive the second mixed air for heat exchange processing and discharge air to the room; A control module, the control module is used to adjust the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger according to environmental information; The first mixed air is a mixed air of outdoor fresh air and indoor return air, the second mixed air is a mixed air of outlet air of the first indoor heat exchanger and indoor return air, the environmental information includes indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger, outlet air temperature, outlet air humidity and/or outdoor temperature, and the heat exchange processing mode includes heat and humidity processing, equal moisture content heating processing and/or heating processing; An indoor unit, wherein the indoor unit is provided with a first cavity for arranging the first indoor heat exchanger and a second cavity for arranging the second indoor heat exchanger; The first cavity is provided with a fresh air valve, a first return air valve and a second return air valve; The second cavity is provided with a first air inlet valve and a second air inlet valve, and the second cavity is connected with the first cavity through the first air inlet valve and the second air inlet valve; The outdoor fresh air introduced by the fresh air valve and the indoor return air introduced by the first return air valve form the first mixed air, the outlet air of the first indoor heat exchanger and the indoor return air introduced by the second return air valve form the second mixed air, and the outlet air of the second indoor heat exchanger and the second mixed air introduced by the first air inlet valve form the third mixed air; The control module is used to control the opening of the first return air valve, the second return air valve, the first inlet air valve and the second inlet air valve respectively; The first air inlet valve and the second air inlet valve are respectively used to introduce the second mixed air into the second cavity, the second air inlet valve is connected to the second indoor heat exchanger, and the second indoor heat exchanger receives the second mixed air through the second air inlet valve; when the second indoor heat exchanger discharges air to the room, the air discharged from the second indoor heat exchanger and the second mixed air introduced by the first air inlet valve form a third mixed air before being discharged to the room. 2. The air conditioning unit according to claim 1, further comprising: A first temperature and humidity sensor, used to obtain indoor temperature and indoor humidity; An outlet temperature sensor, used to obtain the outlet temperature of the first indoor heat exchanger; The mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information includes: Based on the indoor temperature, the indoor humidity and the outlet temperature of the first indoor heat exchanger, control the first indoor heat exchanger to receive the first mixed air for heat and humidity treatment, and control the second indoor heat exchanger to receive the second mixed air for equal humidity heating treatment and discharge air into the room; The air conditioning unit is in a cooling state. 3. The air conditioning unit according to claim 1, further comprising: The second temperature and humidity sensor is used to obtain the outlet air temperature and outlet air humidity; An outlet temperature sensor, used to obtain the outlet temperature of the first indoor heat exchanger; The mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information includes: Based on the outlet air temperature, the outlet air humidity and the outlet temperature of the first indoor heat exchanger, controlling the first indoor heat exchanger to receive the first mixed air for heat and humidity treatment, and controlling the second indoor heat exchanger to receive the second mixed air for equal humidity heating treatment and discharge air into the room; The air conditioning unit is in a cooling state. 4. The air conditioning unit according to claim 1, further comprising: The mode of regulating the refrigerant flow and heat exchange processing of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information includes: Based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger to receive the first mixed air for heating, and controlling the second indoor heat exchanger to receive the second mixed air for heating and discharge air into the room; The air conditioning unit is in a heating state. 5. The air conditioning unit according to any one of claims 1 to 4, characterized in that: When the air conditioning unit is in a heating state, the refrigerant output by the compressor flows through the four-way valve, the first indoor heat exchanger, the second indoor heat exchanger and the outdoor heat exchanger in sequence, and the refrigerant output by the outdoor heat exchanger flows back to the compressor through the four-way valve; When the air-conditioning unit is in a cooling state, the refrigerant output by the compressor flows sequentially through the four-way valve, the outdoor heat exchanger, the second indoor heat exchanger and the first indoor heat exchanger, and the refrigerant output by the first indoor heat exchanger flows back to the compressor through the four-way valve. 6. A control method for an air conditioning unit, characterized in that it is applied to the air conditioning unit according to claim 1, and the control method comprises: Obtain environmental information; regulating the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information; Wherein, the air-conditioning unit includes a main circuit, and the main circuit includes a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger which are connected in sequence to form a circuit, the first indoor heat exchanger is used to receive the first mixed air for heat exchange processing, and the second indoor heat exchanger is used to receive the second mixed air for heat exchange processing and discharge air to the indoor room; the first mixed air is a mixture of outdoor fresh air and indoor return air, and the second mixed air is a mixture of the outlet air of the first indoor heat exchanger and the indoor return air, the environmental information includes indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger, outlet air temperature, outlet air humidity and/or outdoor temperature, and the heat exchange processing mode includes heat and humidity processing, equal moisture content heating processing and/or heating processing. 7. The control method of the air conditioning unit according to claim 6, characterized in that the regulating the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information comprises: Based on the indoor temperature, the indoor humidity and the outlet temperature of the first indoor heat exchanger, control the first indoor heat exchanger to receive the first mixed air for heat and humidity treatment, and control the second indoor heat exchanger to receive the second mixed air for equal humidity heating treatment and discharge air into the room; The air conditioning unit is in a cooling state. 8. The control method of the air conditioning unit according to claim 6, characterized in that the regulating the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information comprises: Based on the outlet air temperature, the outlet air humidity and the outlet temperature of the first indoor heat exchanger, controlling the first indoor heat exchanger to receive the first mixed air for heat and humidity treatment, and controlling the second indoor heat exchanger to receive the second mixed air for equal humidity heating treatment and discharge air into the room; The air conditioning unit is in a cooling state. 9. The control method of the air conditioning unit according to claim 6, characterized in that the regulating the refrigerant flow and heat exchange processing mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information comprises: Based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger to receive the first mixed air for heating, and controlling the second indoor heat exchanger to receive the second mixed air for heating and discharge air into the room; The air conditioning unit is in a heating state.