WO2023142498A1

WO2023142498A1 - Air conditioner and controller thereof, control method, and computer readable storage medium

Info

Publication number: WO2023142498A1
Application number: PCT/CN2022/119967
Authority: WO
Inventors: 齐藤真辉
Original assignee: 广东美的制冷设备有限公司; 美的集团股份有限公司
Priority date: 2022-01-26
Filing date: 2022-09-20
Publication date: 2023-08-03
Also published as: CN116538656A

Abstract

An air conditioner and a controller thereof, a control method, and a computer readable storage medium. The method comprises: when an air conditioner is in a cool mode, acquiring a coolant circulation amount of the air conditioner (S101); acquiring a first target supercooling degree of a second heat exchanger according to the coolant circulation amount (S102); acquiring a current target supercooling degree and a superheat degree of the second heat exchanger (S103); and if the first target supercooling degree is less than or equal to the current target supercooling degree and the superheat degree is less than or equal to a superheat degree threshold, updating the current target supercooling degree to the first target supercooling degree (S104).

Description

Air conditioner and its controller, control method and computer-readable storage medium

Cross References to Related Applications

This disclosure claims the priority of the Chinese patent application with application number 202210093352.0 and titled "air conditioner and its controller, control method, and computer-readable storage medium" filed on January 26, 2022, the entire contents of which are incorporated by reference in this disclosure.

technical field

The present disclosure relates to the technical field of air conditioners, and in particular to an air conditioner and its controller, a control method, and a computer-readable storage medium.

Background technique

When the air conditioner is running under cooling conditions, it is necessary to ensure that the refrigerant at the inlet of the indoor unit is in a liquid state, so it is necessary to perform supercooling control to adjust the temperature of the liquid refrigerant at the outlet of the outdoor unit. When the amount of refrigerant circulation is reduced, it may cause an excess of the supercooling degree. When the cooling degree is excessive, in order to control the increase of the supercooling degree during the operation of the air conditioner to reach the preset supercooling degree value , as shown in Figure 2, it is necessary to increase the refrigerant flow branched to the second heat exchanger, resulting in a further reduction in the refrigerant flow flowing into the indoor unit side, resulting in poor cooling effect and reduced cooling efficiency of the air conditioner.

public content

The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the first object of the present disclosure is to propose a control method for an air conditioner, which calculates and updates the target supercooling degree based on the refrigerant circulation amount so as to prevent the refrigerant flow rate flowing into the indoor unit from being too low due to excessive supercooling degree, In this way, the poor cooling effect of the air conditioner and the decline in cooling efficiency can be avoided.

A second object of the present disclosure is to propose a computer-readable storage medium.

The third objective of the present disclosure is to provide an air conditioner controller.

The fourth object of the present disclosure is to provide an air conditioner.

In order to achieve the above purpose, the embodiment of the first aspect of the present disclosure proposes an air conditioner control method, the air conditioner includes an outdoor unit and an indoor unit, the outdoor unit includes a compressor, a four-way valve, a first heat exchanger, a first section One end of the first heat exchanger is connected to the exhaust/return port of the compressor through a four-way valve, and the other end of the first heat exchanger is connected through the first section The flow element is connected to the first input end of the second heat exchanger, the first output end of the second heat exchanger is respectively connected to one end of the indoor unit and one end of the second throttling element, and the other end of the second throttling element is connected to The second input end of the second heat exchanger is connected, the second output end of the second heat exchanger is connected with the air return port of the compressor, and the other end of the indoor unit is connected with the air return port/exhaust port of the compressor through a four-way valve , the method includes: when the air conditioner is in cooling mode, obtaining the refrigerant circulation amount of the air conditioner; obtaining the first target supercooling degree of the second heat exchanger according to the refrigerant circulation amount; obtaining the current target supercooling degree of the second heat exchanger and superheating degree; if the first target supercooling degree is less than or equal to the current target supercooling degree, and the superheating degree is less than or equal to the superheating degree threshold, then update the current target supercooling degree to the first target supercooling degree.

According to the air conditioner control method of the embodiment of the present disclosure, when the air conditioner is in the cooling mode, the refrigerant circulation amount of the air conditioner is obtained, and the first target supercooling degree of the second heat exchanger is obtained according to the refrigerant circulation amount, and the second heat exchanger is obtained. Second, the current target subcooling degree and superheating degree of the heat exchanger. If the first target subcooling degree is less than or equal to the current target subcooling degree and the superheating degree is less than or equal to the superheating degree threshold, the current target supercooling degree is updated to the first target supercooling. Thus, the updated target supercooling degree is calculated and updated based on the refrigerant circulation amount to prevent the refrigerant flow into the indoor unit from being too low due to excessive supercooling, thereby avoiding poor cooling effect and cooling efficiency reduction of the air conditioner.

According to an embodiment of the present disclosure, it further includes: if the first target supercooling degree is greater than the current target supercooling degree, or if the first target supercooling degree is less than or equal to the current target supercooling degree and the superheating degree is greater than the superheating degree threshold, Then keep the current target supercooling degree unchanged.

According to an embodiment of the present disclosure, obtaining the refrigerant circulation amount of the air conditioner includes: obtaining the suction refrigerant density, capacity, rotation number and volume efficiency of the compressor; obtaining the refrigerant circulation amount according to the suction refrigerant density, capacity, rotation number and volume efficiency .

According to an embodiment of the present disclosure, obtaining the suction refrigerant density of the compressor includes: obtaining a return air pressure of a return air port of the compressor; and obtaining the suction refrigerant density according to the return air pressure.

According to an embodiment of the present disclosure, obtaining the degree of superheat of the second heat exchanger includes: obtaining the temperature difference between the second output end of the second heat exchanger and the second input end of the second heat exchanger, obtaining superheat.

According to an embodiment of the present disclosure, after updating the current target supercooling degree to the first target supercooling degree, the method further includes: obtaining the current supercooling degree of the second heat exchanger; if the first target supercooling degree is greater than the current If the supercooling degree is lower than the current supercooling degree, increase the opening degree of the second throttling element; if the first target supercooling degree is less than or equal to the current supercooling degree, then reduce the opening degree of the second throttling element.

According to an embodiment of the present disclosure, obtaining the current subcooling degree of the second heat exchanger includes: obtaining the discharge pressure of the discharge port of the compressor and the temperature of the first output end of the second heat exchanger; obtaining the discharge pressure The temperature difference between the corresponding saturation temperature and the temperature of the first output of the second heat exchanger yields the current degree of subcooling.

According to an embodiment of the present disclosure, the second heat exchanger includes a heat exchange assembly in which the first heat exchange fins and the second heat exchange fins are stacked sequentially. The first input end and the second output end are arranged at the corner, the second input end and the first output end are arranged at the two top corners of the other end of the front plate, and the two top corners of one end of the first heat exchange fin are connected with the second heat exchanger A first through hole and a second through hole are opened at two corners of one end of the heat exchange fin, and a second through hole is opened at two corners of the other end of the first heat exchange fin and at two corners of the other end of the second heat exchange fin. The three through holes and the fourth through hole, the first input end, the first through hole of the first heat exchanging fin, the first heat exchanging fin, the third through hole of the first heat exchanging fin and the first output end are connected, and The two input ends, the fourth through hole of the second heat exchanging fin, the second heat exchanging fin, the second through hole of the second heat exchanging fin and the second output end are in communication.

In order to achieve the above purpose, the embodiment of the second aspect of the present disclosure proposes a computer-readable storage medium on which is stored the control program of the air conditioner, and when the control program of the air conditioner is executed by the processor, it can achieve The control method of the air conditioner in.

According to the computer-readable storage medium of the embodiment of the present disclosure, through the control method of the above-mentioned air conditioner, the target supercooling degree is calculated and updated according to the refrigerant circulation amount to prevent the refrigerant flow rate flowing into the indoor unit from being too low due to excessive supercooling degree, thereby Avoid causing poor cooling effect of the air conditioner and decrease in cooling efficiency.

In order to achieve the above purpose, the embodiment of the third aspect of the present disclosure proposes an air conditioner controller, including: a memory, a processor, and an air conditioner control program stored in the memory and operable on the processor. When the processor executes the program , implementing the air conditioner control method in the embodiment of the first aspect.

According to the air conditioner controller of the embodiment of the present disclosure, through the control method of the above-mentioned air conditioner, the target supercooling degree is calculated and updated through the refrigerant circulation amount to prevent the refrigerant flow into the indoor unit from being too low due to the excessive supercooling degree, thereby avoiding the The cooling effect of the air conditioner is not good, and the cooling efficiency drops.

In order to achieve the above purpose, the embodiment of the fourth aspect of the present disclosure proposes an air conditioner, including: an outdoor unit and an indoor unit, the outdoor unit includes a compressor, a four-way valve, a first heat exchanger, a first throttling element, a second Two heat exchangers and the second throttling element, one end of the first heat exchanger is connected to the exhaust port/return port of the compressor through a four-way valve, and the other end of the first heat exchanger is connected to the second throttling element through the first throttling element. The first input end of the second heat exchanger is connected, the first output end of the second heat exchanger is respectively connected with one end of the indoor unit and one end of the second throttling element, and the other end of the second throttling element is connected with the second heat exchange element. The second input end of the heat exchanger is connected, the second output end of the second heat exchanger is connected with the air return port of the compressor, and the other end of the indoor unit is connected with the air return port/exhaust port of the compressor through a four-way valve; the air conditioner controller , used to obtain the refrigerant circulation amount of the air conditioner when the air conditioner is in cooling mode, and obtain the first target supercooling degree of the second heat exchanger according to the refrigerant circulation amount, and obtain the current target supercooling degree of the second heat exchanger If the first target supercooling degree is less than or equal to the current target supercooling degree and the superheating degree is less than or equal to the superheating degree threshold, the current target supercooling degree is updated to the first target supercooling degree.

According to the air conditioner of the embodiment of the present disclosure, the target supercooling degree is calculated and updated through the refrigerant circulation amount to prevent the refrigerant flow rate flowing into the indoor unit from being too low due to excessive supercooling degree, thereby avoiding poor cooling effect of the air conditioner and a decrease in cooling efficiency .

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Description of drawings

FIG. 1 is a flowchart of a control method of an air conditioner according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of an air conditioner implementing an air conditioner control method according to an embodiment of the present disclosure;

3 is a schematic structural diagram of a second heat exchanger according to an embodiment of the present disclosure;

FIG. 4 is a flowchart of a control method of an air conditioner according to another embodiment of the present disclosure;

FIG. 5 is a flowchart of a control method of an air conditioner after changing a target supercooling degree according to an embodiment of the present disclosure;

Fig. 6 is a schematic structural diagram of an air conditioner according to an embodiment of the present disclosure.

Detailed ways

Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present disclosure and should not be construed as limiting the present disclosure.

It should be noted that when the air conditioner is running under cooling conditions, it is necessary to ensure that the refrigerant at the inlet of the indoor unit is in a liquid state, so it is necessary to perform supercooling control to adjust the temperature of the liquid refrigerant at the outlet of the outdoor unit. The supercooling degree value of the supercooling degree control adopted is usually a fixed value. When the refrigerant circulation volume decreases, the fixed supercooling degree value may be excessive. During the operation of the air conditioner, in order to control the increase of the supercooling degree In order to achieve the preset fixed supercooling degree value, as shown in Figure 2, it is necessary to increase the flow of refrigerant branched to the second heat exchanger, resulting in a decrease in the flow of refrigerant flowing into the indoor unit side, resulting in poor cooling effect of the air conditioner. Good, cooling efficiency drops.

In view of the unsatisfactory control effect on the subcooling degree of the air conditioner in the prior art, the air conditioner control method proposed in the present disclosure can calculate and update the target supercooling degree through the calculation of the amount of refrigerant circulation to suppress the excessive supercooling caused by excessive cooling. The flow rate of refrigerant flowing into the indoor unit is too low, so as to avoid poor cooling effect of the air conditioner and decrease in cooling efficiency.

The air conditioner control method proposed by the embodiments of the present disclosure will be described below with reference to the accompanying drawings.

FIG. 1 is a flowchart of a control method of an air conditioner according to an embodiment of the present disclosure.

As an example, the structure of an air conditioner implementing the air conditioner control method shown in FIG. 1 may be shown in FIG. 2 , which is a schematic structural diagram of an air conditioner implementing the air conditioner control method according to an embodiment of the present disclosure. The air conditioner includes an outdoor unit 10 and an indoor unit 20, wherein the outdoor unit 10 includes a compressor 11, a four-way valve 12, a first heat exchanger 13, a first throttling element 14, a second heat exchanger 15 and a second section flow element 16, one end of the first heat exchanger 13 is connected to the exhaust/return port of the compressor 11 through the four-way valve 12, and the other end of the first heat exchanger 13 is connected to the second heat exchanger 13 through the first throttling element 14 The first input end of the heat exchanger 15 is connected, the first output end of the second heat exchanger 15 is respectively connected with one end of the indoor unit 20 and one end of the second throttling element 16, and the other end of the second throttling element 16 is connected with the first end of the second throttling element 16. The second input end of the second heat exchanger 15 is connected, the second output end of the second heat exchanger 15 is connected to the air return port of the compressor 11, and the other end of the indoor unit 20 is connected to the air return port of the compressor 11 through the four-way valve 12 / exhaust port. It should be noted that when the four-way valve, the first heat exchanger, the first throttling element, the second heat exchanger, and the second throttling element are arranged in the return air passage of the air conditioner, one end of the first heat exchanger It is connected to the air return port of the compressor through the four-way valve, and correspondingly, the other end of the indoor unit is connected to the exhaust port of the compressor through the four-way valve; when the four-way valve, the first heat exchanger, and the first section When the flow element, the second heat exchanger, and the second throttling element are arranged in the exhaust passage of the air conditioner, one end of the first heat exchanger is connected to the exhaust port of the compressor through a four-way valve, and correspondingly, the indoor unit The other end of the compressor is connected to the air return port of the compressor through a four-way valve.

Further, as shown in FIG. 3 , the second heat exchanger 15 includes a heat exchange assembly in which the first heat exchange fins 151 and the second heat exchange fins 152 are sequentially stacked alternately. The top of the heat exchange assembly is provided with a front end plate 153 . One end of the plate 153 is provided with a first input terminal and a second output terminal at two vertex corners, and the other end of the front plate 153 is provided with a second input terminal and a first output terminal at two vertex corners. One end of the first heat exchange fin 151 The first through hole and the second through hole are provided at the two corners and the two corners of one end of the second heat exchange fin 152, and the two corners of the other end of the first heat exchange fin 151 and the second heat exchange fin 152 There are third through-holes and fourth through-holes at the two top corners of the other end, the first input end, the first through-hole of the first heat-exchange fin 151, the first heat-exchange fin 151, the first heat-exchange fin 151 The third through hole of the second heat exchange fin 152 communicates with the first output end, the second input end, the fourth through hole of the second heat exchange fin 152, the second heat exchanging fin 152, the second through hole of the second heat exchanging fin 152 and the first through hole of the second heat exchanging fin 152 The two output terminals are connected.

Specifically, when the air conditioner is working normally, as shown in Figure 2, as a specific example, one end of the first heat exchanger 13 is connected to the exhaust port of the compressor 11 through the four-way valve 12, and the compressor 11 first connects the The inflowing low-temperature and low-pressure gas refrigerant is compressed into high-temperature and high-pressure gas refrigerant, and the compressed high-temperature and high-pressure gas refrigerant is sent to the first heat exchanger 13 through the four-way valve 12, and the first heat exchanger 13 condenses the inflowing high-temperature and high-pressure gas refrigerant Liquefied to convert it into a high-temperature and high-pressure liquid refrigerant, the high-temperature and high-pressure liquid refrigerant flows into the second heat exchanger 15 through the first throttling element 14, and performs heat exchange and cooling there. The structure of the second heat exchanger is specifically shown in Figure 3 It shows that during the heat exchange and cooling process, the high-temperature and high-pressure liquid refrigerant flowing in from the first input end is cooled to a medium-temperature and high-pressure liquid refrigerant after flowing through the second heat exchange fin 152, and then passed through the second heat exchanger 15. One output port is sent to the indoor unit 20 and the second throttling element 16 respectively, wherein the medium-temperature and high-pressure liquid refrigerant flowing into the second throttling element 16 is converted into a low-temperature and low-pressure two-phase refrigerant after expansion, and passes through the second heat exchanger 15 The second input end of the second input port retransmits the low-temperature and low-pressure two-phase refrigerant to the second heat exchanger 15, and the low-temperature and low-pressure two-phase refrigerant flowing in from the second input end is heated and evaporated into a low-temperature and low-pressure refrigerant after flowing through the first heat exchange fins 151. Gas refrigerant, that is to say, in the heat exchange process, the high-temperature and high-pressure liquid refrigerant is cooled by the low-temperature and low-pressure two-phase refrigerant to become a medium-temperature and high-pressure liquid refrigerant, and the low-temperature and low-pressure two-phase refrigerant evaporates into a low-temperature and low-pressure refrigerant when exchanging heat with the high-temperature and high-pressure liquid refrigerant Gas refrigerant, the generated low-temperature and low-pressure gas refrigerant is delivered to the compressor 11 through the second output end of the second heat exchanger 15 . In addition, the medium-temperature and high-pressure liquid refrigerant branched from the first output port to the indoor unit 20 will be transformed into a low-temperature and low-pressure gas refrigerant after a series of expansion, heat absorption and evaporation, and will be re-delivered to the compressor 11 through the four-way valve 12 To maintain the refrigerant circulation in the cooling mode of the air conditioner.

It should be noted that the channels in the first heat exchange fin and the second heat exchange fin of the second heat exchanger can be set as herringbone corrugations, or other channel shapes that are conducive to accelerating heat exchange, such as wavy corrugations. There are no specific restrictions.

As shown in Figure 1, the control method of the air conditioner includes the following steps:

Step S101, when the air conditioner is in cooling mode, the refrigerant circulation amount of the air conditioner is obtained.

Specifically, when the air conditioner is adjusted to the cooling mode, it is necessary to obtain the refrigerant flow circulating in the cooling mode, that is, to obtain the refrigerant circulation volume of the air conditioner, which will seriously affect the cooling effect of the air conditioner. When the amount of refrigerant circulation is insufficient, it may cause the unit to operate at light load or even idle, resulting in poor cooling effect and reduced cooling efficiency of the air conditioner.

In some embodiments, obtaining the refrigerant circulation amount of the air conditioner includes: obtaining the intake refrigerant density, capacity, rotation speed and volumetric efficiency of the compressor; obtaining the refrigerant circulation amount according to the suction refrigerant density, capacity, rotation number and volume efficiency.

Wherein, obtaining the suction refrigerant density of the compressor includes: obtaining the return air pressure of the air return port of the compressor; and obtaining the suction refrigerant density according to the return air pressure.

Specifically, a pressure sensor (not shown in FIG. 2 ) is installed at the air return port of the compressor 11, and the return air pressure of the refrigerant flowing into the compressor 11 is obtained in real time through the pressure sensor, and the inflow pressure is calculated according to the obtained return air pressure in real time. The refrigerant density of the compressor 11 is to obtain the current suction refrigerant density; at the same time, through the compressor controller and other equipment, parameters such as the capacity, rotation number and volumetric efficiency of the compressor can be obtained in real time, and according to the real-time obtained suction refrigerant density, capacity, rotation speed, etc. The number and volume efficiency can be used to calculate the refrigerant circulation amount through the following formula (1):

Refrigerant circulation volume = compressor capacity × compressor revolutions × 3600 × 10 ^-6 × suction refrigerant density × volumetric efficiency (1)

Step S102, obtaining a first target supercooling degree of the second heat exchanger according to the circulation amount of the refrigerant.

It should be noted that the degree of supercooling control is the control of adjusting the temperature of the liquid refrigerant at the inlet of the indoor unit under the condition of supercooling. When the length of the connecting pipe and the height difference between the indoor unit and the outdoor unit are at the maximum, it can ensure that the state of the refrigerant at the inlet of the indoor unit is in a liquid state.

Specifically, the first target supercooling degree of the second heat exchanger is determined through the P-h line diagram, look-up table, or the refrigerant circulation amount-subcooling degree characteristic diagram according to the newly acquired refrigerant circulation amount. Refrigerant density, capacity, number of rotations and volumetric efficiency. During the operation of the air conditioner, the refrigerant circulation volume changes all the time. If the target supercooling degree is not adjusted in time, the supercooling degree may occur when the refrigerant circulation volume decreases. The control value is excessive, and at the same time, the pressure loss of the refrigerant will become smaller with the reduction of the refrigerant circulation, which will further lead to poor cooling effect and lower cooling efficiency of the air conditioner.

Step S103, acquiring the current target supercooling degree and superheating degree of the second heat exchanger.

Specifically, during the running process of the air conditioner, the current target supercooling degree and superheating degree of the second heat exchanger 15 can be obtained through the air conditioner controller and temperature sensors, wherein the current target supercooling degree is during the running process of the air conditioner. The original target supercooling degree to be executed, the initial current target supercooling degree can be a preset value, and the current target supercooling degree is stored in the air conditioner controller. It should be noted that when the supercooling degree value becomes the first target supercooling degree cooling degree, the first target supercooling degree will cover the current target supercooling degree in the air conditioner controller, and use the first target supercooling degree as the current target supercooling degree when the air conditioner is running at the next moment; The heat is the difference between the superheated temperature and the saturation temperature of the refrigerant under the same evaporation pressure in the refrigeration cycle. The superheated temperature of the refrigerant is the temperature of the superheated refrigerant vapor sucked by the compressor that is higher than the corresponding saturation temperature of its pressure. In this disclosure, it is the first Second, the temperature of the refrigerant at the second output end of the heat exchanger. The saturation temperature refers to the temperature of the liquid and vapor in a dynamic equilibrium state, that is, the saturated state. In the saturated state, the temperature of the liquid and the vapor are equal, which is the second in this disclosure. The temperature of the refrigerant at the second input end of the heat exchanger.

In some embodiments, obtaining the degree of superheat of the second heat exchanger includes: obtaining the temperature difference between the second output end of the second heat exchanger and the second input end of the second heat exchanger to obtain the degree of superheat .

Specifically, the second heat exchanger 15 is provided with a temperature sensor (not shown in FIG. 2 ), respectively detecting the temperature of the low-temperature and low-pressure two-phase refrigerant delivered to the second input end through the second throttling element 16, and heat exchange processing Afterwards, the temperature of the low-temperature and low-pressure gas refrigerant delivered from the second output end, in the second heat exchanger 15, the low-temperature and low-pressure two-phase refrigerant absorbs heat and converts into a low-temperature and low-pressure gas refrigerant, so the temperature of the low-temperature and low-pressure gas refrigerant is relatively high. High, the superheat degree of the second heat exchanger 15 can be obtained by subtracting the temperature of the low-temperature and low-pressure two-phase refrigerant from the detected temperature of the low-temperature and low-pressure gas refrigerant.

Step S104, if the first target supercooling degree is less than or equal to the current target supercooling degree and the superheating degree is less than or equal to the superheating degree threshold, update the current target supercooling degree to the first target supercooling degree.

Specifically, after the first target supercooling degree is calculated according to the obtained refrigerant circulation amount, the first target supercooling degree is compared with the current target supercooling degree to be executed under the current operating state of the air conditioner, wherein the current target supercooling degree The degree may be the preset initial target supercooling degree, or it may be the updated target supercooling degree calculated according to the amount of refrigerant circulation at the last moment, and the obtained superheating degree is compared with the preset superheating degree threshold, optional , the superheat threshold is set to 1K, when it is judged that the current target supercooling degree is greater than the first target supercooling degree and the second heat exchanger superheating degree is less than or equal to 1K (that is, less than or equal to the preset superheating degree threshold), it means that the current actual The amount of refrigerant circulation flowing into the second heat exchanger is too low, which does not match the current target supercooling degree. The current target supercooling degree corresponds to the current actual refrigerant circulation excess, which may lead to a decline in the cooling capacity and efficiency of the air conditioner. Therefore, the The smaller first target supercooling degree is used as the target supercooling degree to be executed by the second heat exchanger of the air conditioner, and the replacement of the current target supercooling degree is realized. It should be noted that when the target supercooling degree becomes smaller Under normal circumstances, the opening degree of the second throttling element 16 will become smaller, so that the flow rate of the refrigerant flowing into the second heat exchanger 15 through the branch through the second input end is reduced, thereby increasing the flow rate of the refrigerant flowing to the indoor unit 20, and further Improve the cooling capacity and efficiency of the air conditioner.

In some embodiments, the air conditioner control method further includes: if the first target supercooling degree is greater than the current target supercooling degree, or if the first target supercooling degree is less than or equal to the current target supercooling degree, and the superheating degree is greater than If the superheat threshold is set, the current target supercooling degree remains unchanged.

Specifically, after the first target supercooling degree is calculated according to the refrigerant circulation amount acquired in real time, the first target supercooling degree is compared with the current target supercooling degree to be executed under the current operating state of the air conditioner. When judging the current target supercooling degree When the supercooling degree is less than or equal to the first target supercooling degree, it means that the current target supercooling degree is relatively small relative to the current actual refrigerant circulation volume, that is, it is relatively small corresponding to the current working condition. In order to ensure the stable operation of the air conditioner , do not change the current target supercooling degree; when it is judged that the current target supercooling degree is greater than the first target supercooling degree, but the detected superheating degree is greater than 1K (that is, less than or equal to the preset superheating degree threshold), then maintain the current target The supercooling degree continues to be in the cooling mode, that is, the current target supercooling degree is also not changed, that is, the first target supercooling degree is not covered by the current target multi-cooling degree in the above two cases.

Further, as a specific example, as shown in FIG. 4 , the control method of the air conditioner may include the following steps:

Step S201, start the cooling mode.

Specifically, when the air conditioner is adjusted to the cooling condition, in order to ensure that the state of the refrigerant at the inlet of the indoor unit is in a liquid state, it is necessary to perform supercooling control. The medium-temperature and high-pressure liquid refrigerant flowing out from the first output end is branched and delivered to the indoor unit and the second throttling element.

Step S202, calculating the refrigerant circulation amount.

Specifically, the amount of refrigerant circulation in the air conditioner will seriously affect the cooling effect of the air conditioner. When the amount of refrigerant circulation is insufficient, it may cause the unit to operate at a light load or even idle. Therefore, it is necessary to determine the amount of refrigerant circulation during the operation of the air conditioner. According to the The return air pressure obtained at the air return port is used to calculate the suction refrigerant density of the compressor, and the parameters such as the capacity, revolutions, and volumetric efficiency of the compressor can be obtained in real time through the compressor controller and other equipment. According to the real-time obtained suction refrigerant density, capacity, The number of revolutions and volumetric efficiency calculates the amount of refrigerant circulation.

Step S203, calculating the first target supercooling degree, and obtaining the current target supercooling degree.

Specifically, the first target supercooling degree at the current moment is calculated according to the obtained refrigerant circulation amount, and at the same time, the current target supercooling degree is obtained through the air conditioner controller. The initial current target supercooling degree can be a preset value, and the air conditioner runs During the process, the current target supercooling degree gradually changes to the target supercooling degree calculated according to the refrigerant circulation amount at the previous moment, that is, the target supercooling degree after each change is used as the current target supercooling degree at the next moment and stored in the air conditioner controller.

Step S204, judging whether the first target supercooling degree is less than or equal to the current target supercooling degree.

Specifically, calculate the first target degree of supercooling according to the amount of refrigerant circulation acquired at the current moment, compare the first target degree of supercooling with the current target degree of supercooling to be performed by the second heat exchanger under the current operating state of the air conditioner, and determine Whether the first target supercooling degree is less than or equal to the current target supercooling degree, if yes, execute step S205, if not, do not change the current target supercooling degree and end the process.

Step S205, obtaining the superheat degree of the second heat exchanger.

Specifically, when it is judged that the current target degree of subcooling is greater than the first target degree of supercooling, the temperature of the low-temperature and low-pressure two-phase refrigerant at the second input end and the low-temperature refrigerant delivered from the second output end after the heat exchange process are obtained through the temperature sensor. The temperature of the low-pressure gas refrigerant. The low-temperature and low-pressure two-phase refrigerant will absorb heat when it is converted into a low-temperature and low-pressure gas refrigerant. Therefore, subtract the temperature of the low-temperature and low-pressure two-phase refrigerant from the obtained low-temperature and low-pressure gas refrigerant temperature. Get superheat.

Step S206, judging whether the superheat degree is less than or equal to the superheat degree threshold.

Specifically, the air conditioner controller is preset with a superheat threshold, and judges the obtained second heat exchanger superheat and the preset superheat threshold. Optionally, the superheat threshold is set to 1K. When the second heat exchanger When the superheat degree of the device is less than or equal to 1K (that is, less than or equal to the preset superheat degree threshold), step S207 is executed; otherwise, the current target supercooling degree is not changed and the process ends.

Step S207, changing the target supercooling degree.

Specifically, when it is judged that the current target degree of supercooling is greater than the first target degree of supercooling and the degree of superheat of the second heat exchanger is less than or equal to the preset threshold value of superheat degree, it means that the amount of refrigerant circulation actually flowing into the second heat exchanger is too high. Low, does not match the current target supercooling degree, that is, the current target supercooling degree is excessive relative to the current actual refrigerant circulation, which may lead to a decline in the cooling capacity and efficiency of the air conditioner, so the smaller first target supercooling degree is taken as The target supercooling degree to be performed by the second heat exchanger of the air conditioner is realized to change the target supercooling degree.

Thus, the updated target supercooling degree is calculated and updated based on the refrigerant circulation amount to prevent the refrigerant flow into the indoor unit from being too low due to excessive supercooling, thereby avoiding poor cooling effect and cooling efficiency reduction of the air conditioner.

In some embodiments, after the current target supercooling degree is updated to the first target supercooling degree, the above-mentioned air conditioner control method further includes: acquiring the current supercooling degree of the second heat exchanger; If the cooling degree is greater than the current supercooling degree, then increase the opening degree of the second throttling element; if the first target supercooling degree is less than or equal to the current supercooling degree, then adjust the opening degree of the second throttling element. Wherein, obtaining the current subcooling degree of the second heat exchanger includes: obtaining the discharge pressure of the discharge port of the compressor and the temperature of the first output end of the second heat exchanger; obtaining the saturation temperature corresponding to the discharge pressure and the first The temperature difference between the temperatures of the first output ends of the two heat exchangers is used to obtain the current degree of supercooling.

Specifically, the discharge pressure is measured by a pressure sensor (not shown in FIG. 2 ) arranged at the discharge port of the compressor 11, and the saturation temperature of the current refrigerant state is determined according to the obtained discharge pressure. At the same time, by setting the first output The temperature sensor (not shown in FIG. 2 ) at the terminal obtains the refrigerant temperature output from the first output terminal, and the difference between the two is the current supercooling degree.

Compare the updated first target supercooling degree with the obtained current supercooling degree. If the current supercooling degree is less than or equal to the first target supercooling degree, it means that the current supercooling degree value is too small. By increasing the second section The opening degree of the flow element 16 increases the refrigerant flow rate branched into the second heat exchanger 15 to increase the current degree of supercooling; if the current degree of supercooling is greater than the first target degree of supercooling, it means that the branch flows into the second heat exchanger 15 The circulation of the refrigerant flow is too large, resulting in the current supercooling value is too large, so by reducing the opening degree of the second throttling element 16 can control the flow of refrigerant branched into the second heat exchanger 15 to become smaller, reducing the current supercooling degree. coolness. That is to say, by adjusting the opening degree of the second throttling element, the refrigerant flow rate branched into the second heat exchanger can be controlled, and then the current supercooling degree value can be adjusted so that the current supercooling degree is as consistent as possible with the first target supercooling degree , Further improving the cooling capacity and efficiency of the air conditioner.

Further, as a specific example, as shown in FIG. 5 , the control method of the air conditioner after changing the target supercooling degree may include the following steps:

Step S301, acquiring the current supercooling degree of the second heat exchanger.

Specifically, after the target subcooling degree is changed, that is, after the current target supercooling degree is updated to the first target subcooling degree calculated by the refrigerant circulation amount, the pressure sensor (in FIG. Not shown) measure the exhaust pressure to determine the saturation temperature of the current refrigerant state under the exhaust pressure (that is, the saturation temperature of the high-temperature and high-pressure liquid refrigerant), and obtain the refrigerant output from the first output end through the temperature sensor arranged at the first output end Temperature (namely, the temperature of medium-temperature and high-pressure liquid refrigerant), the current subcooling degree of the second heat exchanger can be obtained by subtracting the temperature of the refrigerant output from the first output end from the saturated temperature obtained according to the exhaust pressure.

Step S302, judging whether the current supercooling degree is less than or equal to the first target supercooling degree.

Specifically, after the target supercooling degree is updated to the first target supercooling degree, it is compared with the acquired current supercooling degree to determine whether the current supercooling degree is less than or equal to the first target supercooling degree, if the current supercooling degree degree is less than or equal to the first target supercooling degree, execute step S303, and if the current supercooling degree is greater than the first target supercooling degree, execute step S304.

Step S303, increasing the opening degree of the second throttling element.

Specifically, if the current subcooling degree is less than or equal to the first target supercooling degree, it means that the current subcooling degree corresponding to the flow into and out of the second heat exchanger is small, and it is necessary to reduce the temperature of the refrigerant output from the first output end. The opening of the second throttling element increases the refrigerant flow rate branched into the second heat exchanger, so that the high-temperature and high-pressure liquid refrigerant can conduct more sufficient heat exchange with the low-temperature and low-pressure two-phase refrigerant in the second heat exchanger to increase the cooling range , thereby increasing the current supercooling degree so that the current supercooling degree matches the first target supercooling degree as much as possible.

Step S304, reducing the opening degree of the second throttling element.

Specifically, if the current degree of supercooling is less than or equal to the first target degree of supercooling, it means that the current degree of supercooling corresponding to the flow into and out of the second heat exchanger is too large. At this time, the opening degree of the second throttling element can be reduced. The flow rate of refrigerant flowing into the second heat exchanger from the branch of the first output terminal is reduced, thereby reducing the current degree of supercooling, so that the current degree of supercooling matches the first target degree of supercooling as much as possible.

Thus, by comparing the first target degree of supercooling with the current degree of supercooling, the opening degree of the second throttling element is adjusted to control the flow rate of the branched refrigerant flowing into the second heat exchanger, thereby adjusting the value of the current degree of supercooling , so that the current supercooling degree is as consistent as possible with the first target supercooling degree, further improving the cooling capacity and efficiency of the air conditioner.

To sum up, according to the air conditioner control method of the embodiment of the present disclosure, the target supercooling degree is calculated and updated through the refrigerant circulation amount to prevent the refrigerant flow rate flowing into the indoor unit from being too low due to excessive supercooling degree, so as to avoid causing the air conditioner to The cooling effect is not good, and the cooling efficiency is reduced; at the same time, after changing the target supercooling degree, by comparing the first target supercooling degree with the current supercooling degree, adjust the opening degree of the second throttling element to control the branch inflow The refrigerant flow rate of the second heat exchanger is further adjusted to the current supercooling degree value, so that the current supercooling degree is as consistent as possible with the first target supercooling degree, further improving the cooling capacity and efficiency of the air conditioner.

An embodiment of the present disclosure provides a computer-readable storage medium on which is stored a control program of an air conditioner, and when the control program of the air conditioner is executed by a processor, the above-mentioned method for controlling the air conditioner is implemented.

An embodiment of the present disclosure provides an air conditioner controller, including: a memory, a processor, and an air conditioner control program stored in the memory and operable on the processor. When the processor executes the program, the above-mentioned air conditioner is realized. control method.

Fig. 6 is a schematic structural diagram of an air conditioner according to an embodiment of the present disclosure. As shown in Figure 6, the air conditioner 100 includes: an outdoor unit 10, an indoor unit 20 and an air conditioner controller 30, wherein the outdoor unit 10 includes a compressor 11, a four-way valve 12, a first heat exchanger 13, a first section Flow element 14, second heat exchanger 15 and second throttling element 16, one end of the first heat exchanger 13 is connected with the exhaust port/return port of compressor 11 through four-way valve 12, the first heat exchanger 13 The other end of the second heat exchanger 15 is connected to the first input end of the second heat exchanger 15 through the first throttling element 14, and the first output end of the second heat exchanger 15 is respectively connected to one end of the indoor unit 20 and the second throttling element 16. One end is connected, the other end of the second throttling element 16 is connected with the second input end of the second heat exchanger 15, the second output end of the second heat exchanger 15 is connected with the air return port of the compressor 11, and the indoor unit 20 The other end is connected to the air return port/exhaust port of the compressor 11 through the four-way valve 12; the air conditioner controller 30 is used to obtain the refrigerant circulation amount of the air conditioner when the air conditioner is in the cooling mode, and obtain the second refrigerant circulation amount according to the refrigerant circulation amount. The first target degree of supercooling of the heat exchanger 15, and obtaining the current target degree of supercooling and superheat of the second heat exchanger 15, wherein, if the first target degree of supercooling is less than or equal to the current target degree of supercooling and the degree of superheat If it is less than or equal to the superheat degree threshold, the current target supercooling degree is updated to the first target supercooling degree.

In some embodiments, the air conditioner controller 30 is further specifically configured to: if the first target supercooling degree is greater than the current target supercooling degree, or if the first target supercooling degree is less than or equal to the current target supercooling degree and the superheating degree is greater than If the superheat threshold is set, the current target supercooling degree remains unchanged.

In some embodiments, the air conditioner controller 30 is further specifically configured to: acquire the suction refrigerant density, capacity, rotation speed and volumetric efficiency of the compressor; obtain the refrigerant circulation amount according to the suction refrigerant density, capacity, rotation number and volume efficiency.

In some embodiments, the air conditioner controller 30 is further specifically configured to: acquire the return air pressure of the air return port of the compressor; and acquire the density of the sucked refrigerant according to the return air pressure.

In some embodiments, the air conditioner controller 30 is further specifically configured to: obtain a temperature difference between the second output end of the second heat exchanger and the second input end of the second heat exchanger to obtain the degree of superheat.

In some embodiments, after updating the current target supercooling degree to the first target supercooling degree, the air conditioner controller 30 is further specifically configured to: acquire the current supercooling degree of the second heat exchanger; if the first target supercooling degree If the degree of supercooling is greater than the current degree of supercooling, then increase the opening degree of the second throttling element; if the first target degree of supercooling is less than or equal to the current degree of supercooling, then adjust the opening degree of the second throttling element.

In some embodiments, the air conditioner controller 30 is further specifically configured to: obtain the discharge pressure of the discharge port of the compressor and the temperature of the first output end of the second heat exchanger; obtain the saturation temperature corresponding to the discharge pressure and the second The temperature difference between the temperatures at the first output of the heat exchanger yields the current degree of subcooling.

In some embodiments, the second heat exchanger includes a heat exchanging assembly in which the first heat exchanging fins and the second heat exchanging fins are sequentially stacked alternately. The top of the heat exchanging assembly is provided with a front end plate. The first input end and the second output end are provided, the second input end and the first output end are arranged at the two top corners of the other end of the front plate, the two top corners of one end of the first heat exchange fin and the second heat exchange fin A first through hole and a second through hole are opened at the two corners of one end of the first heat exchange fin, and a third through hole is opened at the two corners of the other end of the first heat exchange fin and the two corners of the other end of the second heat exchange fin. hole and the fourth through hole, the first input end, the first through hole of the first heat exchange fin, the first heat exchange fin, the third through hole of the first heat exchange fin and the first output end are connected, and the second input end, the fourth through hole of the second heat exchanging fin, the second heat exchanging fin, the second through hole of the second heat exchanging fin and the second output end.

It should be noted that, for the description of the air conditioner in the present disclosure, please refer to the description of the control method of the air conditioner in the present disclosure, and details are not repeated here.

It should be noted that the logic and/or steps shown in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, apparatus, or device and execute instructions), or in combination with these Instructions are used to execute systems, devices, or equipment. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use in or in conjunction with an instruction execution system, device or device. More specific examples (non-exhaustive list) of computer-readable media include the following: electrical connection with one or more wires (electronic device), portable computer disk case (magnetic device), random access memory (RAM), Read Only Memory (ROM), Erasable and Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, as it may be possible, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or other suitable processing if necessary. The program is processed electronically and stored in computer memory.

It should be understood that various parts of the present disclosure may be implemented in hardware, software, firmware or a combination thereof. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques known in the art: Discrete logic circuits, ASICs with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless specifically defined otherwise.

In this disclosure, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it may be a fixed connection or a detachable connection, unless otherwise clearly defined and limited. , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present disclosure according to specific situations.

Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present disclosure, and those skilled in the art can understand the above-mentioned embodiments within the scope of the present disclosure. The embodiments are subject to changes, modifications, substitutions and variations.

Claims

A control method for an air conditioner, the air conditioner includes an outdoor unit and an indoor unit, the outdoor unit includes a compressor, a four-way valve, a first heat exchanger, a first throttling element, a second heat exchanger and a second section A flow element, one end of the first heat exchanger is connected to the exhaust/return port of the compressor through the four-way valve, and the other end of the first heat exchanger is connected through the first throttling element It is connected with the first input end of the second heat exchanger, and the first output end of the second heat exchanger is respectively connected with one end of the indoor unit and one end of the second throttling element, and the first The other end of the two throttling elements is connected to the second input end of the second heat exchanger, the second output end of the second heat exchanger is connected to the air return port of the compressor, and the other end of the indoor unit One end is connected to the air return port/exhaust port of the compressor through the four-way valve, and the method includes:

When the air conditioner is in cooling mode, obtain the refrigerant circulation amount of the air conditioner;

Obtaining a first target supercooling degree of the second heat exchanger according to the refrigerant circulation amount;

Acquiring the current target subcooling degree and superheating degree of the second heat exchanger;

If the first target supercooling degree is less than or equal to the current target supercooling degree and the superheating degree is less than or equal to a superheating degree threshold, then updating the current target supercooling degree to the first target supercooling degree.
The method according to claim 1, further comprising:

If the first target supercooling degree is greater than the current target supercooling degree, or if the first target supercooling degree is less than or equal to the current target supercooling degree and the superheating degree is greater than the superheating degree threshold , then keep the current target supercooling degree unchanged.
The method according to claim 1, wherein said obtaining the refrigerant circulation volume of the air conditioner comprises:

Obtain the suction refrigerant density, capacity, rotation number and volumetric efficiency of the compressor;

The circulation amount of the refrigerant is obtained according to the density, capacity, revolution number and volumetric efficiency of the sucked refrigerant.
The method according to claim 3, wherein obtaining the suction refrigerant density of the compressor comprises:

Obtain the return air pressure of the air return port of the compressor;

The density of the sucked refrigerant is obtained according to the return air pressure.
The method according to claim 1, wherein obtaining the degree of superheat of the second heat exchanger comprises:

Obtaining the temperature difference between the second output end of the second heat exchanger and the second input end of the second heat exchanger to obtain the degree of superheat.
The method according to claim 1, wherein, after updating the current target supercooling degree to the first target supercooling degree, the method further comprises:

Obtain the current degree of subcooling of the second heat exchanger;

If the first target degree of supercooling is greater than the current degree of supercooling, increasing the opening degree of the second throttle element;

If the first target degree of supercooling is less than or equal to the current degree of supercooling, the opening degree of the second throttling element is decreased.
The method according to claim 6, wherein obtaining the current degree of subcooling of the second heat exchanger comprises:

Obtaining the discharge pressure of the discharge port of the compressor and the temperature of the first output end of the second heat exchanger;

The temperature difference between the saturation temperature corresponding to the exhaust pressure and the temperature of the first output end of the second heat exchanger is obtained to obtain the current degree of supercooling.
The method according to claim 1, wherein the second heat exchanger includes a heat exchange assembly in which the first heat exchange fins and the second heat exchange fins are stacked in sequence, and the top of the heat exchange assembly is provided with a front plate , the first input terminal and the second output terminal are provided at the two corners of one end of the front plate, and the second input terminal and the second output terminal are provided at the two corners of the other end of the front plate. An output end, a first through hole and a second through hole are opened at the two top corners of one end of the first heat exchange fin and the two top corners of one end of the second heat exchange fin, the first heat exchange fin A third through hole and a fourth through hole are opened at the two corners of the other end of the sheet and the two corners of the other end of the second heat exchange fin, the first input end, the first heat exchange fin The first through hole of the first heat exchange fin, the third through hole of the first heat exchange fin communicate with the first output end, the second input end, the second heat exchange fin The fourth through hole of the second heat exchange fin, the second through hole of the second heat exchange fin and the second output end are in communication.
The computer-readable storage medium stores the control program of the air conditioner on it, and when the control program of the air conditioner is executed by the processor, the control method of the air conditioner according to any one of claims 1-8 is implemented.
An air conditioner controller, comprising: a memory, a processor, and an air conditioner control program stored on the memory and operable on the processor. When the processor executes the program, the control program according to claims 1-8 is realized. The control method of the air conditioner described in any one.
Air conditioners, including:

An outdoor unit and an indoor unit, the outdoor unit includes a compressor, a four-way valve, a first heat exchanger, a first throttling element, a second heat exchanger and a second throttling element, the first heat exchanger One end is connected to the exhaust/return port of the compressor through the four-way valve, and the other end of the first heat exchanger is connected to the first end of the second heat exchanger through the first throttling element. The first output end of the second heat exchanger is connected to one end of the indoor unit and one end of the second throttling element, and the other end of the second throttling element is connected to the second throttling element. The second input end of the second heat exchanger is connected, the second output end of the second heat exchanger is connected with the air return port of the compressor, and the other end of the indoor unit is connected with the compressor through the four-way valve. The air return port/exhaust port of the machine is connected;

An air conditioner controller, configured to obtain the refrigerant circulation amount of the air conditioner when the air conditioner is in cooling mode, and obtain the first target supercooling degree of the second heat exchanger according to the refrigerant circulation amount, and Obtaining the current target degree of supercooling and superheating of the second heat exchanger, wherein if the first target degree of supercooling is less than or equal to the current target degree of supercooling, and the degree of superheating is less than or equal to a threshold of superheating, Then update the current target supercooling degree to the first target supercooling degree.