CN112413821A

CN112413821A - Air conditioning equipment, control method, control device and readable storage medium

Info

Publication number: CN112413821A
Application number: CN202011421989.5A
Authority: CN
Inventors: 彭三国; 颜利波; 丁云霄; 张宇晟; 李骏; 高东东
Original assignee: GD Midea Heating and Ventilating Equipment Co Ltd; Hefei Midea Heating and Ventilating Equipment Co Ltd
Current assignee: GD Midea Heating and Ventilating Equipment Co Ltd; Hefei Midea Heating and Ventilating Equipment Co Ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-02-26

Abstract

The invention provides an air conditioning apparatus, a control method, a control device and a readable storage medium. Wherein, air conditioning equipment includes: a compressor including an exhaust port and an intake port; an outdoor heat exchanger; the first end of the bypass pipeline is connected with the exhaust port, and the second end of the bypass pipeline is connected with the inlet of the outdoor heat exchanger; the cut-off device is arranged on the bypass pipeline; the first throttling element is arranged on a refrigerant pipeline of the air inlet; the electric heating device is arranged on a refrigerant pipeline of the air inlet and is positioned between the air inlet and the first throttling element; and the controller is connected with the cutoff device and used for controlling the cutoff device to open or close the bypass pipeline according to the defrosting instruction. According to the invention, on one hand, the indoor temperature can be effectively prevented from being reduced, the heating effect and the indoor heating comfort level are ensured, on the other hand, the working modes of the four-way valve and the air conditioning equipment do not need to be switched again after defrosting is finished, and the higher air outlet temperature can be quickly reached.

Description

Air conditioning equipment, control method, control device and readable storage medium

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner, a control method of the air conditioner, a control device of the air conditioner and a readable storage medium.

Background

When the air conditioning system heats at low temperature, the surface of a heat exchanger of the outdoor unit can be frosted, and after the air conditioning system operates for a period of time, the four-way valve of the air conditioning system can be reversed to operate and refrigerate to defrost.

In the defrosting process, the indoor unit becomes an evaporator, heat can be absorbed from the indoor, the temperature of the indoor side is reduced, and the comfort is affected. In heating, the indoor unit is on the high-pressure side and the outdoor unit is on the low-pressure side. In the defrosting process, the outdoor heat exchanger is changed into a high-pressure side, the indoor unit is changed into a low-pressure side, and after defrosting is finished, the four-way valve is reversed, and the indoor unit is changed into the high-pressure side. In the whole process, the refrigerant of the system needs to be transferred twice, particularly for the multi-split air conditioner, the piping of the system is long, the refrigerant transferring time is longer, and the time required for the indoor unit to reach higher air outlet temperature after defrosting is finished is very long.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

To this end, a first aspect of the invention proposes an air conditioning system.

A second aspect of the invention proposes a control method of an air conditioning apparatus.

A third aspect of the present invention provides a control device for an air conditioning apparatus.

A fourth aspect of the invention is directed to a readable storage medium.

In view of this, a first aspect of the present invention provides an air conditioning apparatus including: a compressor including an exhaust port and an intake port; an outdoor heat exchanger; the first end of the bypass pipeline is connected with the exhaust port, and the second end of the bypass pipeline is connected with the inlet of the outdoor heat exchanger; the cut-off device is arranged on the bypass pipeline; the first throttling element is arranged on a refrigerant pipeline of the air inlet; the electric heating device is arranged on a refrigerant pipeline of the air inlet and is positioned between the air inlet and the first throttling element; and the controller is connected with the cutoff device and used for controlling the cutoff device to open or close the bypass pipeline according to the defrosting instruction.

The invention provides air conditioning equipment which comprises a compressor, an outdoor heat exchanger, a bypass pipeline, a cut-off device and a controller. Wherein the compressor includes a discharge port. The first end of the bypass pipeline is connected with the exhaust port, and the second end of the bypass pipeline is connected with the inlet of the outdoor heat exchanger. The cut-off device is arranged on the bypass pipeline. The controller is connected with the cut-off device and controls the cut-off device to open or close the bypass pipeline through a defrosting instruction.

When the air conditioning equipment is in a heating mode and needs defrosting, the air conditioning equipment is not switched to a cooling mode, a bypass pipeline is arranged between an exhaust port of the compressor and an inlet of the outdoor heat exchanger, and the controller controls the cutoff device arranged on the bypass pipeline to open the bypass pipeline so as to conduct the bypass pipeline, so that part of high-temperature and high-pressure refrigerant enters the outdoor heat exchanger to be defrosted. When defrosting is finished, the controller controls the cut-off device to close the bypass pipeline, the refrigerant does not enter the outdoor heat exchanger through the bypass pipeline any more, and the air conditioning equipment continues heating.

The air conditioning equipment also comprises an electric heating device and a first throttling element, wherein the electric heating device is arranged on a refrigerant pipeline between an air inlet of the compressor and the four-way valve. Through opening electric heating device, can heat the evaporation to the refrigerant that flows through on the one hand to the refrigerant temperature that prevents to get into the compressor is crossed lowly, and on the other hand can guarantee to change the frost effect.

The first throttling element is arranged on a refrigerant pipeline between an air inlet of the compressor and the four-way valve. The electric heating device is positioned between the air inlet of the compressor and the first throttling element. Through setting up first throttling element on the refrigerant pipeline between the air inlet of compressor and the cross valve, the refrigerant passes through the cross valve, passes through throttling arrangement throttle again, and through the evaporation of electric heater unit heating simultaneously, it gets back to the compressor to ensure that the refrigerant becomes gaseous refrigerant.

By the air conditioning equipment provided by the invention, the conduction direction of the four-way valve can be not switched during defrosting, namely, the operation mode of the air conditioning equipment is not required to be switched from a heating mode to a cooling mode, and the defrosting effect can be ensured, so that the air conditioning equipment can not absorb heat on the indoor side during defrosting and can also prevent 'cold air' from being output to the indoor, on one hand, the indoor temperature can be effectively prevented from being reduced, the heating effect and the indoor heating comfort level are ensured, on the other hand, the working modes of the four-way valve and the air conditioning equipment are not required to be switched again after defrosting is finished, the higher air outlet temperature can be quickly reached, and the heating state is recovered at the first time, so that the heating experience is ensured.

The cut-off device can be a ball valve, an electromagnetic valve, an electronic expansion valve, a mechanical valve and the like. It should be understood by those skilled in the art that the bypass line can be opened or closed by the cutoff device, and is not particularly limited thereto.

In addition, the air conditioning equipment in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, the compressor further includes an air inlet, and the air conditioning equipment further includes: the indoor heat exchanger is connected with the outdoor heat exchanger; and the first end of the four-way valve is connected with the exhaust port, the second end of the four-way valve is connected with the outdoor heat exchanger, the third end of the four-way valve is connected with the indoor heat exchanger, and the fourth end of the four-way valve is connected with the air inlet.

In the technical scheme, the air conditioning equipment further comprises at least one indoor heat exchanger and a four-way valve. The compressor also includes an air intake. Wherein, at least one indoor heat exchanger is connected with the outdoor heat exchanger. The four-way valve comprises four ports, namely a first end, a second end, a third end and a fourth end. The first end is connected with the exhaust port of the compressor, the second end is connected with the outdoor heat exchanger, the third end is connected with the indoor heat exchanger, and the fourth end is connected with the air inlet of the compressor. When the air conditioning equipment heats and needs defrosting, the four-way valve is not reversed, and the normal heating state is kept. The controller controls the cut-off device, and high-temperature and high-pressure refrigerant discharged by the compressor enters the outdoor heat exchanger through the bypass pipeline to be defrosted. And the other part of high-temperature and high-pressure refrigerant discharged by the compressor enters the indoor heat exchanger for heating after passing through the four-way valve. By the technical scheme, the four-way valve can not be reversed during defrosting, heat on the indoor side is not absorbed during defrosting, and the indoor temperature is prevented from being reduced. In the whole defrosting process, the refrigerant does not need to be transferred, and particularly for the multi-split air conditioner, the high air outlet temperature can be quickly achieved.

In any one of the above technical solutions, the air conditioning apparatus further includes: the indoor fan is arranged towards the indoor heat exchanger; the second throttling element is arranged on an inlet pipeline of the indoor heat exchanger; the controller is also used for controlling the second throttling element to reduce the opening degree according to the defrosting instruction and controlling the indoor fan to reduce the rotating speed.

In the technical scheme, the air conditioning equipment further comprises an indoor fan and a second throttling element. Wherein, indoor fan sets up towards indoor heat exchanger, and the second throttling element sets up on indoor heat exchanger's inlet pipeline. When the air conditioning equipment is not reversed to defrost, the controller responds to a defrosting instruction, controls the second throttling element to reduce the opening or close, and controls the indoor fan to reduce the rotating speed or close, so that on one hand, the pressure difference between the indoor heat exchanger and the outdoor heat exchanger is reduced, and the high-temperature and high-pressure refrigerant can rapidly enter the outdoor heat exchanger through the bypass pipeline, and rapid defrosting is realized. On the other hand, the indoor heat exchanger is prevented from dissipating excessive heat to cause insufficient defrosting of the refrigerant temperature, so that a good defrosting effect is achieved.

In any one of the above technical solutions, the air conditioning apparatus further includes: the controller is connected with the third throttling element, and the second end of the bypass pipeline is positioned between the third throttling element and the inlet of the outdoor heat exchanger; the controller is used for adjusting the opening degree of the third throttling element according to the evaporation pressure of the indoor heat exchanger; and controlling the opening degree of the third throttling element to be reduced to a preset opening degree according to the defrosting instruction.

In this solution, the air conditioning apparatus further includes a third throttling element. The third throttling element is arranged on an inlet pipeline of the outdoor heat exchanger and is connected with the controller. The second end of the bypass line is located between the third restriction and the inlet of the outdoor heat exchanger. When the air conditioning equipment is not reversed to defrost, the controller responds to a defrosting instruction, the fan is controlled to reduce the rotating speed, the second throttling element reduces the opening degree, and the third throttling element is opened to the preset opening degree, so that the pressure difference between the indoor heat exchanger and the outdoor heat exchanger is effectively reduced, a high-temperature and high-pressure refrigerant can quickly enter the outdoor heat exchanger through the bypass pipeline, and quick defrosting is realized. Meanwhile, the indoor heat exchanger can be prevented from dissipating excessive heat to lead to insufficient defrosting of the refrigerant temperature, so that a good defrosting effect is achieved. When the air conditioning equipment refrigerates at low temperature, because the outdoor environment temperature is lower, the heat exchange temperature difference of the outdoor heat exchanger is larger, and the heat emitted by the refrigerant is more, when the starting capacity of the indoor unit is smaller, the indoor unit can not absorb enough heat, the low pressure is too low, and the indoor heat exchanger is frozen. The controller adjusts the opening degree of the third throttling element according to the evaporating pressure of the indoor heat exchanger, and high-temperature refrigerants discharged by the compressor enter the indoor heat exchanger after being condensed by the outdoor heat exchanger and throttled by the third throttling element and the second throttling element, so that the evaporating pressure of the indoor heat exchanger can be improved, and the indoor heat exchanger is prevented from being frozen. The smaller the opening degree of the third throttle is, the higher the evaporation pressure of the indoor heat exchanger can be.

In any one of the above technical solutions, the air conditioning apparatus further includes: and the refrigerant heat dissipation device is used for dissipating heat for the controller and is arranged on the refrigerant pipeline between the second throttling element and the third throttling element.

In the technical scheme, the air conditioning equipment further comprises a refrigerant heat dissipation device, and the refrigerant heat dissipation device is arranged on a refrigerant pipeline between the second throttling element and the third throttling element. Through refrigerant heat abstractor, utilize microthermal refrigerant to dispel the heat for the controller, can improve the reliability of complete machine to the cost is lower.

A second aspect of the present invention provides a control method of an air conditioner for controlling the air conditioner according to any one of the above aspects, the control method comprising: responding to a defrosting start instruction, and controlling a cutoff device to open a bypass pipeline; and controlling the cutoff device to close the bypass pipeline in response to the defrosting end instruction.

The control method of the air conditioning equipment provided by the invention is used for the air conditioning equipment in any technical scheme. When the air conditioning equipment is in a heating mode and needs defrosting, the air conditioning equipment does not switch to a cooling mode in response to a defrosting start instruction, and the bypass pipeline is opened by controlling the cutoff device arranged on the bypass pipeline so as to conduct the bypass pipeline, so that part of high-temperature and high-pressure refrigerant enters the outdoor heat exchanger to be defrosted. When defrosting is finished, the defrosting finishing instruction is responded, the cutoff device is controlled to close the bypass pipeline, the refrigerant does not enter the outdoor heat exchanger through the bypass pipeline any more, and the air conditioning equipment continues heating. By the control method of the air conditioning equipment, the conduction direction of the four-way valve can be not switched during defrosting, namely, the operation mode of the air conditioning equipment is not required to be switched from a heating mode to a cooling mode, the defrosting effect can be ensured, so that the air conditioning equipment can not absorb heat on the indoor side during defrosting and can also prevent cold air from being output to the indoor, on one hand, the indoor temperature can be effectively prevented from being reduced, the heating effect and the indoor heating comfort level are ensured, on the other hand, the working modes of the four-way valve and the air conditioning equipment are not required to be switched again after defrosting is finished, the higher air outlet temperature can be quickly reached, and the heating state is recovered at the first time, so that the heating experience is ensured.

In the above technical solution, the air conditioning equipment includes an indoor fan, a second throttle and a third throttle, and the control method further includes: responding to a defrosting start instruction, controlling the fan to reduce the rotating speed, and controlling the second throttling element to reduce the opening degree; and controlling the opening degree of the third throttling element to be reduced to a preset opening degree.

In the technical scheme, when the air conditioning equipment does not change the direction and defrost, the second throttling element is controlled to reduce the opening degree or close in response to a defrosting start instruction, the indoor fan is controlled to reduce the rotating speed or close, and the third throttling element is controlled to open the preset opening degree, so that the pressure difference between the indoor heat exchanger and the outdoor heat exchanger can be reduced, a high-temperature and high-pressure refrigerant can quickly enter the outdoor heat exchanger through the bypass pipeline, and quick defrosting is realized. On the other hand, the indoor heat exchanger can be prevented from dissipating excessive heat to cause insufficient defrosting of the refrigerant temperature, so that a good defrosting effect is achieved.

In any of the above technical solutions, the control method of the air conditioning equipment further includes: responding to a defrosting start instruction, and acquiring the operating frequency of the compressor; and acquiring a corresponding preset opening in a preset comparison table according to the operating frequency.

In the technical scheme, the running frequency of the compressor and the comparison table of the preset opening degree of the third throttling element are preset, when the air conditioning equipment is not reversed to defrost, the opening degree of the third throttling element is matched with the running frequency of the compressor, on one hand, the pressure difference between the indoor heat exchanger and the outdoor heat exchanger can be effectively reduced, and a high-temperature and high-pressure refrigerant can quickly enter the outdoor heat exchanger through the bypass pipeline, so that the rapid defrosting is realized. On the other hand, the running requirement of the compressor is met, and the reliability of the compressor is improved.

In any of the above technical solutions, the air conditioning equipment further includes a refrigerant heat dissipation device for dissipating heat for the controller; after controlling the opening degree of the third throttling element to be reduced to the preset opening degree, the control method further comprises: acquiring the current temperature of the controller; and controlling a third throttling element to adjust the opening degree according to the comparison result of the current temperature and the temperature threshold value.

In the technical scheme, the air conditioning equipment further comprises a refrigerant heat dissipation device used for dissipating heat for the controller. And when the air conditioning equipment does not change the direction to defrost, responding to a defrosting starting instruction, and controlling the opening degree of the third throttling element to be reduced to a preset opening degree. And then obtaining the current temperature of the controller, comparing the current temperature with a temperature threshold value, and controlling a third throttling element to adjust the opening degree according to a comparison result.

Specifically, when the current temperature of the controller is greater than the temperature threshold, it is indicated that the temperature of the controller is high and there is an overheating risk, and at this time, the third throttling element is controlled to increase the opening degree, so that more refrigerants flow through the refrigerant heat dissipation device, and the heat dissipation effect of the refrigerant heat dissipation device is improved, so that the current temperature of the controller can be effectively reduced by the refrigerant heat dissipation device.

If the current temperature of the controller is less than the temperature threshold value, the controller is not in overheating risk, and the opening degree of the third throttling element can be maintained unchanged or reduced appropriately, so that the evaporation pressure of the indoor heat exchanger is ensured.

In any of the above technical solutions, the temperature threshold includes a first temperature threshold, a second temperature threshold, a third temperature threshold, a fourth temperature threshold, and a fifth temperature threshold; controlling a third throttling element to adjust the opening degree according to the comparison result of the current temperature and the temperature threshold, wherein the step of controlling the third throttling element to adjust the opening degree comprises the following steps: controlling a third throttling element to be fully opened when the current temperature is greater than or equal to a first temperature threshold; the current temperature is smaller than the first temperature threshold and is greater than or equal to the second temperature threshold, and the third throttling element is controlled to increase the first opening value; the current temperature is smaller than the second temperature threshold and is greater than or equal to a third temperature threshold, and a third throttling element is controlled to increase a second opening value; controlling a third throttling element to maintain a preset opening degree when the current temperature is less than a third temperature threshold and is more than or equal to a fourth temperature threshold; the current temperature is smaller than the fourth temperature threshold and is greater than or equal to the fifth temperature threshold, and the third throttling element is controlled to reduce the second opening value; controlling a third throttling element to reduce the first opening value when the current temperature is less than a fifth temperature threshold value; wherein the first opening value is greater than the second opening value.

In this embodiment, the temperature threshold includes, but is not limited to, a first temperature threshold, a second temperature threshold, a third temperature threshold, a fourth temperature threshold, and a fifth temperature threshold. The first temperature threshold value to the fifth temperature threshold value are sequentially decreased. The temperature threshold may be based on a maximum protection temperature of the compressor inverter.

And when the current temperature of the controller is greater than or equal to the first temperature threshold value, controlling the third throttling element to be fully opened. When the current temperature is between the first temperature threshold and the second temperature threshold (including the second temperature threshold), controlling the third throttling element to increase the first opening value. And when the current temperature is between the second temperature threshold and a third temperature threshold (including the third temperature threshold), controlling the third throttling element to increase the second opening value. And when the current temperature is between the third temperature threshold and a fourth temperature threshold (including the fourth temperature threshold), controlling the third throttling element to maintain the preset opening degree. And when the current temperature is between the fourth temperature threshold and a fifth temperature threshold (including the fifth temperature threshold), controlling the third throttling element to reduce the second opening value. And when the current temperature is less than the fifth temperature threshold value, controlling the third throttling element to reduce the first opening value. Wherein the first opening value is greater than the second opening value. According to the technical scheme, the opening degree of the third throttling element is accurately controlled according to the protection temperature of the compressor module, so that the reliability of the compressor during defrosting can be guaranteed, and defrosting can be rapidly carried out. In any of the above technical solutions, the air conditioning equipment further includes an indoor heat exchanger, and the control method further includes: acquiring an evaporation pressure value of the indoor heat exchanger; and under the condition that the evaporation pressure value is lower than a preset pressure threshold value, controlling the second throttling element to reduce the opening degree until the evaporation pressure value is larger than the pressure threshold value.

In this technical solution, the air conditioning equipment further includes an indoor heat exchanger. When the air conditioning equipment refrigerates at low temperature, because the outdoor environment temperature is lower, the heat exchange temperature difference of the outdoor heat exchanger is larger, and the heat emitted by the refrigerant is more, when the starting capacity of the indoor unit is smaller, the indoor unit can not absorb enough heat, the low pressure is too low, and the indoor heat exchanger is frozen. The evaporation pressure value of the indoor heat exchanger is obtained, the evaporation pressure value is compared with a preset pressure threshold value, and when the evaporation pressure value is lower than the preset pressure threshold value, the second throttling element is controlled to reduce the opening degree until the evaporation pressure value is not lower than the preset pressure value. Through the technical scheme of the invention, when the air conditioning equipment refrigerates at low temperature, the evaporating pressure of the indoor heat exchanger can be effectively improved, so that the indoor heat exchanger is prevented from being frozen.

A third aspect of the present invention provides a control device of an air conditioning apparatus, including: a memory having a program or instructions stored thereon; and the processor is configured to implement the control method of the air conditioning equipment according to any one of the technical schemes when executing the program or the instruction.

The control device of the air conditioner provided by the invention realizes the steps of the control method of the air conditioner according to any one of the above technical schemes when the processor executes the program, so the control device of the air conditioner has all the advantages of the control method of the air conditioner according to any one of the above technical schemes.

A fourth aspect of the present invention provides a readable storage medium on which a program or instructions are stored, the program or instructions, when executed by a processor, implementing the control method of an air conditioning apparatus according to any one of the above-described aspects.

The readable storage medium provided by the invention realizes the steps of the control method of the air conditioner according to any one of the above technical schemes when the program is executed by the processor, so the readable storage medium has all the advantages of the control method of the air conditioner according to any one of the above technical schemes.

Additional aspects and advantages of the invention 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 invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows one of the schematic structural views of an air conditioning apparatus according to an embodiment of the present invention;

fig. 2 shows a second schematic structural view of an air conditioning apparatus according to an embodiment of the present invention;

fig. 3 is a third schematic structural view of an air conditioning apparatus according to an embodiment of the present invention;

fig. 4 shows one of the flow charts of the control method of the air conditioner according to the embodiment of the present invention;

fig. 5 shows a second flowchart of a control method of an air conditioner according to an embodiment of the present invention;

fig. 6 is a third flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention;

fig. 7 shows a fourth flowchart of a control method of an air conditioning apparatus according to an embodiment of the present invention;

fig. 8 shows a fifth flowchart of a control method of an air conditioning apparatus according to an embodiment of the present invention;

fig. 9 is a schematic view showing the opening degree control of the third throttle according to the embodiment of the present invention;

fig. 10 is a block diagram showing a configuration of a control apparatus of an air conditioner according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:

100 compressor, 200 four-way valve, 300 outdoor heat exchanger, 400 third throttle, 500 refrigerant heat abstractor, 602 first solenoid valve, 604 second solenoid valve, 606 third solenoid valve, 702 first indoor heat exchanger, 704 second indoor heat exchanger, 706 third indoor heat exchanger, 708 indoor fan, 800 cut-off device, 900 first throttle, 902 electric heating device.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

An air conditioner, a control method of the air conditioner, a control device of the air conditioner, and a readable storage medium provided according to some embodiments of the present invention are described below with reference to fig. 1 to 10.

Example one

Fig. 1 shows one of the structural schematic diagrams of an air conditioner according to an embodiment of the present invention, fig. 2 shows a second structural schematic diagram of an air conditioner according to an embodiment of the present invention, and fig. 3 shows a third structural schematic diagram of an air conditioner according to an embodiment of the present invention.

In some embodiments of the present invention, as shown in fig. 1, 2 and 3, there is provided an air conditioning apparatus including: the compressor 100, the outdoor heat exchanger 300, a bypass line, a cutoff device 800, a first throttling element 900, an electric heating device 902 and a controller. Wherein the compressor 100 includes a discharge port. A first end of the bypass line is connected to the exhaust port, and a second end of the bypass line is connected to an inlet of the outdoor heat exchanger 300, i.e., an exhaust bypass. The cutoff device 800 is provided on the bypass line. The controller is connected with the cutoff device 800, and responds to the defrosting instruction to control the cutoff device 800 to open or close the bypass pipeline, so that the on-off control of the bypass pipeline is realized.

The first throttle 900 is disposed on a refrigerant line between an air inlet of the compressor 100 and the four-way valve 200. An electric heating device 902 is located between the air intake of compressor 100 and first throttle 900.

The electric heater 902 is disposed on a refrigerant line between an air inlet of the compressor 100 and the four-way valve 200. The refrigerant flowing through the electric heating device is heated and evaporated, and finally returns to the compressor 100, thereby preventing the temperature of the refrigerant entering the compressor 100 from being too low.

Specifically, the defrosting instruction comprises a defrosting start instruction and a defrosting end instruction.

Specifically, the intercepting means 800 may be a ball valve, a solenoid valve, an electronic expansion valve, a mechanical valve, or the like.

In the embodiment of the present invention, when the air conditioning equipment is in the heating mode and needs defrosting, the controller responds to a defrosting start command, the air conditioning equipment is not switched to the cooling mode, a bypass line is arranged between the exhaust port of the compressor 100 and the inlet of the outdoor heat exchanger 300, and the cutoff device 800 arranged on the bypass line is controlled to open the bypass line, so that the bypass line is conducted, a part of high-temperature and high-pressure refrigerant enters the outdoor heat exchanger 300 to be defrosted, heat on the indoor side is not absorbed during defrosting, and the reduction of the indoor temperature is prevented.

When defrosting is finished, the controller responds to a defrosting finishing instruction, the cutoff device 800 is controlled to close the bypass pipeline so as to cut off the bypass pipeline, the refrigerant enters the outdoor heat exchanger 300 without passing through the bypass pipeline, and the air conditioning equipment continues heating after defrosting is finished. The whole defrosting process does not need refrigerant migration.

The defrosting instruction specifically comprises a defrosting start instruction and a defrosting end instruction, and may be an internal instruction generated by the controller according to the real machine running state of the air conditioning equipment, or a control instruction sent by a user through a remote controller, a wire control, a control panel, a mobile phone application program and the like.

By arranging the first throttling element 900 on a refrigerant pipeline between the air inlet of the compressor 100 and the four-way valve 200, the refrigerant passes through the four-way valve 200, is throttled by the throttling device, and is heated and evaporated by the electric heating device, so that the refrigerant is changed into a gaseous refrigerant and returns to the compressor 100.

By being provided with the first throttling element 900, the first throttling element 900 is disposed between the electric heating device 902 and the four-way valve, and the first throttling element can throttle the refrigerant entering the air inlet of the compressor 100, so that the heating effect of the electric heating device 902 is improved.

Through the air conditioning equipment that this embodiment provided, can realize not switching over the direction of conducting of cross valve when changing the frost, also need not switch over air conditioning equipment's operational mode to the refrigeration mode by the mode of heating, and can guarantee to change the frost effect, make air conditioning equipment can not absorb the heat of indoor side when changing the frost, prevent to indoor output "air conditioning" simultaneously, can effectively prevent that the indoor temperature from reducing on the one hand, guarantee heating effect and indoor heating comfort level, on the other hand also need not switch over cross valve and air conditioning equipment's operational mode once more after changing the frost end, can reach higher air-out temperature fast, resume the state of heating at the very first time, thereby guarantee to heat and experience.

Example two

In some embodiments of the present invention, as shown in fig. 1, 2 and 3, compressor 100 further includes an air intake. The air conditioner further includes at least one indoor heat exchanger and a four-way valve 200. Wherein at least one indoor heat exchanger is connected with the outdoor heat exchanger 300.

Specifically, the number of indoor heat exchangers is exemplified as 3. Thus, the at least one indoor heat exchanger comprises a first indoor heat exchanger 702, a second indoor heat exchanger 704, a third indoor heat exchanger 706.

In an embodiment of the present invention, four-way valve 200 includes four ports, which are a first port, a second port, a third port, and a fourth port. Wherein, the first end is connected with the discharge port of the compressor 100, the second end is connected with the outdoor heat exchanger 300, the third end is connected with the indoor heat exchanger, and the fourth end is connected with the air inlet of the compressor 100.

When the air conditioning equipment heats and needs defrosting, the four-way valve 200 is not reversed, and the normal heating state is kept. The controller controls the cutoff device 800 to open the bypass line in response to the defrosting start instruction, and part of the high-temperature and high-pressure refrigerant discharged from the compressor 100 enters the outdoor heat exchanger 300 through the bypass line to be defrosted. Another part of the high-temperature and high-pressure refrigerant discharged from the compressor 100 passes through the four-way valve 200 and then enters the indoor heat exchanger to be heated. Therefore, the four-way valve 200 is not reversed during defrosting, heat on the indoor side is not absorbed during defrosting, and the indoor temperature is prevented from being reduced. In the whole defrosting process, the refrigerant does not need to be transferred, and particularly for the multi-split air conditioner, the high air outlet temperature can be quickly achieved.

EXAMPLE III

In some embodiments of the present invention, as shown in fig. 1, 2 and 3, the air conditioning apparatus further includes an indoor fan 708 and a second throttling member. Wherein, the indoor fan 708 is arranged towards the indoor heat exchanger, and the second throttling element is arranged on the inlet pipeline of the indoor heat exchanger.

Specifically, the second orifice may be an electronic expansion valve, an electric ball valve, or a capillary tube.

In this embodiment, the second throttle includes a first solenoid valve 602, a second solenoid valve 604, and a third solenoid valve 606.

When the air conditioning equipment does not change the direction and defrost, the controller responds to a defrosting instruction, controls the second throttling element to reduce the opening degree or directly close, and controls the indoor fan 708 to reduce the rotating speed or close, so that on one hand, the pressure difference between the indoor heat exchanger and the outdoor heat exchanger 300 is reduced, and high-temperature and high-pressure refrigerants can rapidly enter the outdoor heat exchanger 300 through the bypass pipeline, thereby achieving rapid defrosting. On the other hand, the indoor heat exchanger is prevented from dissipating excessive heat to cause insufficient defrosting of the refrigerant temperature, so that a good defrosting effect is achieved.

Example four

In some implementations of the invention, as shown in fig. 1, 2 and 3, the air conditioning apparatus further includes a third throttling element 400. The third throttling element 400 is disposed on an inlet pipe of the outdoor heat exchanger 300 and connected to the controller. A second end of the bypass line is located between the third throttling element 400 and the inlet of the outdoor heat exchanger 300.

Specifically, the third orifice 400 may be an electronic expansion valve, an electric ball valve, or a capillary tube.

When the air conditioning equipment does not change the direction and defrost, the controller responds to a defrosting start instruction, controls the fan to close or open the lower operation wind shield, controls the second throttling element to reduce the opening degree, and controls the third throttling element 400 to open to the preset opening degree, so that the pressure difference between the indoor heat exchanger and the outdoor heat exchanger 300 is effectively reduced, high-temperature and high-pressure refrigerants can quickly enter the outdoor heat exchanger 300 through the bypass pipeline, and quick defrosting is realized. Meanwhile, the indoor heat exchanger can be prevented from dissipating excessive heat to lead to insufficient defrosting of the refrigerant temperature, so that a good defrosting effect is achieved.

When the air conditioning equipment refrigerates at a low temperature, because the outdoor environment temperature is low, the heat exchange temperature difference of the outdoor heat exchanger 300 is large, the heat emitted by a refrigerant is large, and when the starting capacity of the indoor unit is small, the indoor unit cannot absorb enough heat, so that the low pressure is too low, and the indoor heat exchanger is frozen. The opening degree of the third throttling element 400 is adjusted by the controller according to the evaporating pressure of the indoor heat exchanger, so that the evaporating pressure of the indoor heat exchanger can be improved, and the indoor heat exchanger is prevented from being frozen.

Specifically, the smaller the opening degree of the third throttle 400 is, the higher the evaporation pressure of the indoor heat exchanger can be.

Specifically, the high-temperature refrigerant discharged from the compressor 100 is condensed by the outdoor heat exchanger 300, throttled by the third throttling element 400 and the second throttling element, and enters the indoor heat exchanger, so that the evaporation pressure of the indoor heat exchanger can be increased.

EXAMPLE five

In some embodiments of the present invention, as shown in fig. 2 and 3, the air conditioning equipment further includes a refrigerant heat sink 500 for dissipating heat for the controller, and the refrigerant heat sink 500 is disposed on the refrigerant pipeline between the second throttling element and the third throttling element 400.

In the embodiment of the invention, the control device comprises a main control board, an electric control board or a compressor frequency conversion module of the air conditioning equipment and the like. The refrigerant heat dissipation device 500 is used for dissipating heat of the electric control unit of the air conditioning equipment, so that on one hand, the heat dissipation effect of the electric control module can be ensured, and the electric control module is prevented from being damaged or halted due to overheating, on the other hand, the electric control module does not need to be provided with an independent heat dissipation module, such as a heat dissipation fin, a heat dissipation fan and the like, and the manufacturing cost of the air conditioning equipment is effectively lowered.

The refrigerant heat sink 500 may be a bypass refrigerant pipeline connected in parallel to the main refrigerant pipeline. In some embodiments, the refrigerant heat dissipation device may further include a plate heat exchanger disposed on the bypass refrigerant pipe to increase a heat exchange area and improve a heat dissipation effect.

EXAMPLE six

In some embodiments of the present invention, specific embodiments of the present invention are illustrated in conjunction with fig. 1 and 3.

First, an air conditioning apparatus according to an embodiment of the present invention will be described with reference to fig. 1.

As shown in fig. 1, an air conditioning system for defrosting without reversing comprises a compressor 100, a four-way valve 200, an outdoor heat exchanger 300, an indoor heat exchanger, a hot gas bypass cutoff device 800, a throttling device and a heating device, wherein one end of the hot gas bypass cutoff device 800 is connected with an exhaust port of the compressor 100, and the other end of the hot gas bypass cutoff device is connected with a pipeline between the indoor heat exchanger and the outdoor heat exchanger 300; the throttling device is connected with one interface of the four-way valve 200, the other end of the throttling device is connected with one end of the heating device, and the other end of the heating device is connected with a return air port of the compressor 100.

When the direction is not changed for defrosting, the four-way valve 200 keeps the normal heating state, the cut-off device 800 is opened, and the high-temperature refrigerant discharged from the compressor 100 enters the external heat exchanger through the cut-off device 800 for defrosting. The other part of the refrigerant from the compressor 100 is cooled at high pressure and high temperature, and then enters the indoor heat exchanger after passing through the four-way valve 200. The fan of the indoor unit is closed or opened with a lower running windshield, and the electronic expansion valve of the indoor unit and the electronic expansion valve of the outdoor unit are opened with a certain opening degree or directly closed. The refrigerant condensed by the outdoor heat exchanger 300 passes through the four-way valve 200, is throttled by the apparatus, and then enters the heating apparatus, and the refrigerant flowing through the heating apparatus is heated and evaporated after being turned on, and finally returns to the compressor 100.

During low-temperature refrigeration, because the outdoor environment temperature is low, the heat exchange temperature difference of the outdoor heat exchanger 300 is large, and the heat emitted by the refrigerant is large, when the starting capacity of the indoor unit is small, the indoor unit cannot absorb enough heat, so that the low pressure is too low, and the heat exchanger of the indoor unit is frozen. Then, during low-temperature refrigeration, high-temperature refrigerant coming out of the compressor 100 is condensed by the outdoor heat exchanger 300, throttled by the outdoor electronic expansion valve and the indoor electronic expansion valve, enters the indoor heat exchanger to be evaporated, passes through the four-way valve 200, and then passes through the throttling device, so that the evaporation pressure of the indoor heat exchanger can be increased, and then the refrigerant which cannot be completely evaporated by the indoor heat exchanger is heated again by starting the heating device, and is changed into gaseous refrigerant to return to the compressor 100.

Next, an air conditioning apparatus according to another embodiment of the present invention will be described with reference to fig. 3.

As shown in fig. 3, many of the compressor 100 modules of the existing air conditioning systems use refrigerant to dissipate heat. In many cases, the power of the heating device is limited by the volume of the outdoor unit, or by the total operating current of the air conditioning system when electric heating is used, and the heating power of the heating device is generally limited. Therefore, when defrosting is not performed in a reversing manner, the electronic expansion valve of the indoor unit and the indoor fan 708 need to be closed, so that insufficient defrosting heat is prevented, and defrosting time is too long. During heating, a high-temperature and high-pressure refrigerant discharged from the compressor 100 passes through the four-way valve 200, enters an indoor unit for condensation, is throttled by an electronic expansion valve, enters the outdoor heat exchanger 300 for evaporation, and then returns to the compressor 100. When the direction is not changed for defrosting, the four-way valve 200 keeps the normal heating state, the cut-off device 800 is opened, and the high-temperature refrigerant discharged from the compressor 100 enters the external heat exchanger through the cut-off device 800 for defrosting. The other part of the high-pressure high-temperature refrigerant from the compressor 100 enters the indoor heat exchanger after passing through the four-way valve 200, the fan of the indoor unit is closed, the valve of the indoor unit is fully opened, and the electronic expansion valve of the outdoor unit is controlled as follows, wherein the electronic expansion valve is opened to keep a certain low-temperature liquid refrigerant flow and radiate the heat of the frequency conversion module of the compressor 100 through refrigerant radiation. The refrigerant condensed by the outdoor heat exchanger 300 passes through the four-way valve 200, is throttled by the apparatus, and then enters the heating apparatus, and the refrigerant flowing through the heating apparatus is heated and evaporated after being turned on, and finally returns to the compressor 100.

EXAMPLE seven

In some embodiments of the present invention, fig. 4 shows one of the flow diagrams of the control method of the air conditioner according to the embodiment of the present invention. Wherein the control method can be used to control an air conditioning apparatus as in any of the embodiments described above.

Specifically, as shown in fig. 4, the control method of the air conditioner includes:

step 1002, responding to a defrosting start instruction, controlling a cutoff device to open a bypass pipeline;

and step 1004, responding to the defrosting ending instruction, and controlling the cutoff device to close the bypass pipeline.

In the embodiment of the invention, when the air conditioning equipment is in a heating mode and needs defrosting, the air conditioning equipment is not switched to a cooling mode in response to a defrosting start instruction, a bypass pipeline is arranged between the exhaust port of the compressor and the inlet of the outdoor heat exchanger, a cut-off device is arranged on the bypass pipeline, and the cut-off device is controlled to open the bypass pipeline, so that part of high-temperature and high-pressure refrigerant enters the outdoor heat exchanger for defrosting.

When defrosting is finished, the defrosting finishing instruction is responded, the cutoff device is controlled to close the bypass pipeline, the refrigerant does not enter the outdoor heat exchanger through the bypass pipeline any more, and the air conditioning equipment continues heating.

Through the control method of the air conditioning equipment provided by the embodiment, the switching-on direction of the four-way valve can be prevented when defrosting is carried out, namely, the operation mode of the air conditioning equipment is not required to be switched to the cooling mode by the heating mode, the defrosting effect can be ensured, so that the air conditioning equipment can not absorb heat of the indoor side when defrosting, and simultaneously, the air conditioning equipment is prevented from outputting 'cold air' to the indoor, on one hand, the reduction of the indoor temperature can be effectively prevented, the heating effect and the indoor heating comfort level are ensured, on the other hand, the working modes of the four-way valve and the air conditioning equipment are not required to be switched again after defrosting is finished, higher air outlet temperature can be quickly reached, the heating state is recovered at the first time, and the.

Example eight

In some embodiments of the present invention, fig. 5 shows a second flowchart of a control method of an air conditioning apparatus according to an embodiment of the present invention. Specifically, the control method is used for controlling the air conditioning apparatus as in any of the above embodiments, and the air conditioning apparatus includes an indoor fan, a second throttle and a third throttle.

Specifically, the control method of the air conditioning equipment comprises the following steps:

step 1012, responding to a defrosting start instruction, controlling the cutoff device to open a bypass pipeline, controlling the fan to reduce the rotating speed, and controlling the second throttling element to reduce the opening degree;

step 1014, controlling the opening degree of the third throttling element to be reduced to a preset opening degree;

and step 1016, in response to the defrosting end instruction, controlling the cutoff device to close the bypass pipeline.

In this embodiment, when the air conditioning equipment is in the heating mode and needs defrosting, in response to a defrosting start instruction, the air conditioning equipment is not switched to the cooling mode, a bypass pipeline is arranged between the exhaust port of the compressor and the inlet of the outdoor heat exchanger, a cut-off device is arranged on the bypass pipeline, and the cut-off device is controlled to open the bypass pipeline, so that part of the high-temperature and high-pressure refrigerant enters the outdoor heat exchanger for defrosting.

In the defrosting process, the second throttling element is controlled to reduce the opening degree or be closed, the indoor fan is controlled to reduce the rotating speed or be closed, and the third throttling element is controlled to be opened to preset the opening degree, so that the pressure difference between the indoor heat exchanger and the outdoor heat exchanger can be reduced, a high-temperature and high-pressure refrigerant can rapidly enter the outdoor heat exchanger through the bypass pipeline, and rapid defrosting is achieved. On the other hand, the indoor heat exchanger can be prevented from dissipating excessive heat to cause insufficient defrosting of the refrigerant temperature, so that a good defrosting effect is achieved.

Example nine

In some embodiments of the present invention, fig. 6 illustrates a third flowchart of a control method of an air conditioner according to an embodiment of the present invention. Specifically, the control method is used for controlling the air conditioning apparatus as in any of the above embodiments, the air conditioning apparatus including an indoor fan, a second throttle and a third throttle.

step 1022, in response to the defrosting start instruction, controlling the cutoff device to open the bypass pipeline;

step 1024, acquiring the operating frequency of the compressor, and acquiring a corresponding preset opening in a preset comparison table according to the operating frequency;

and step 1026, controlling the fan to reduce the rotating speed, controlling the second throttling element to reduce the opening degree, and controlling the opening degree of the third throttling element to reduce to a preset opening degree.

In the embodiment of the invention, through the comparison table of the preset operating frequency of the compressor and the preset opening degree of the third throttling element, as shown in table 1, when the air conditioning equipment does not change the direction for defrosting, the opening degree of the opening of the third throttling element is matched with the operating frequency of the compressor, so that on one hand, the pressure difference between the indoor heat exchanger and the outdoor heat exchanger can be effectively reduced, and high-temperature and high-pressure refrigerants can rapidly enter the outdoor heat exchanger through the bypass pipeline, thereby realizing rapid defrosting. On the other hand, the running requirement of the compressor is met, and the reliability of the compressor is improved.

TABLE 1

Compressor frequency (Hz)	A	B	C	D	……
						Initial opening degree of the third throttle member	a	b	c	d	……

The initial opening degree of the third throttling element, namely the opening degree of the third throttling element to be opened during defrosting, is a preset opening degree.

Example ten

In some embodiments of the present invention, fig. 7 shows a fourth flowchart of a control method of an air conditioning apparatus according to an embodiment of the present invention. Specifically, the control method is used for controlling the air conditioning equipment according to any one of the embodiments, where the air conditioning equipment includes an indoor fan, a second throttling element, a third throttling element, and a refrigerant heat dissipation device for dissipating heat for the controller.

step 1031, in response to the defrosting start instruction, controlling the cutoff device to open the bypass pipeline;

step 1032, acquiring the running frequency of the compressor, and acquiring a corresponding preset opening degree in a preset comparison table according to the running frequency;

step 1033, controlling the fan to reduce the rotating speed, controlling the second throttling element to reduce the opening degree, and controlling the opening degree of the third throttling element to reduce to a preset opening degree;

step 1034, acquiring the current temperature of the controller, and controlling a third throttling element to adjust the opening degree according to the comparison result of the current temperature and the temperature threshold;

and 1035, in response to the defrosting end instruction, controlling the cutoff device to close the bypass pipeline.

In the embodiment of the invention, the air conditioning equipment further comprises a refrigerant heat dissipation device for dissipating heat for the controller. And when the air conditioning equipment does not change the direction to defrost, responding to a defrosting starting instruction, and controlling the opening degree of the third throttling element to be reduced to a preset opening degree. And then obtaining the current temperature of the controller, comparing the current temperature with a temperature threshold value, and controlling a third throttling element to adjust the opening degree according to a comparison result.

EXAMPLE eleven

Fig. 8 shows a fifth flowchart of a control method of an air conditioner according to an embodiment of the present invention. The control method is used for controlling the air conditioning equipment of any one of the embodiments, and the air conditioning equipment comprises an indoor heat exchanger, an indoor fan, a second throttling element, a third throttling element and a refrigerant heat dissipation device for dissipating heat for the controller.

The control method of the air conditioning equipment comprises the following steps:

1102, acquiring an evaporation pressure value of the indoor heat exchanger;

and 1104, under the condition that the evaporation pressure value is lower than the preset pressure threshold, controlling the second throttling element to reduce the opening until the evaporation pressure value is larger than the pressure threshold.

In an embodiment of the present application, the air conditioning apparatus further includes an indoor heat exchanger. When the air conditioning equipment refrigerates at low temperature, because the outdoor environment temperature is lower, the heat exchange temperature difference of the outdoor heat exchanger is larger, and the heat emitted by the refrigerant is more, when the starting capacity of the indoor unit is smaller, the indoor unit can not absorb enough heat, the low pressure is too low, and the indoor heat exchanger is frozen. The evaporation pressure value of the indoor heat exchanger is obtained, the evaporation pressure value is compared with a preset pressure threshold value, and when the evaporation pressure value is lower than the preset pressure threshold value, the second throttling element is controlled to reduce the opening degree until the evaporation pressure value is not lower than the preset pressure value. Through the embodiment of the invention, when the air conditioning equipment refrigerates at low temperature, the evaporating pressure of the indoor heat exchanger can be effectively improved, so that the indoor heat exchanger is prevented from being frozen.

Example twelve

In some embodiments of the present invention, the temperature threshold includes, but is not limited to, a first temperature threshold, a second temperature threshold, a third temperature threshold, a fourth temperature threshold, and a fifth temperature threshold. The first temperature threshold value to the fifth temperature threshold value are sequentially decreased. The temperature threshold may be based on a maximum protection temperature of the compressor inverter.

And controlling the third throttling element to be fully opened when the current temperature is greater than or equal to the first temperature threshold.

And controlling the third throttling element to increase the first opening value when the current temperature is less than the first temperature threshold and is greater than or equal to the second temperature threshold.

And controlling the third throttling element to increase the second opening value when the current temperature is less than the second temperature threshold and is greater than or equal to the third temperature threshold.

And controlling the third throttling element to maintain the preset opening degree when the current temperature is less than the third temperature threshold and is greater than or equal to the fourth temperature threshold.

And controlling the third throttling element to reduce the second opening value when the current temperature is less than the fourth temperature threshold and is greater than or equal to the fifth temperature threshold.

And controlling the third throttling element to reduce the first opening value when the current temperature is less than the fifth temperature threshold value.

Wherein the first opening value is greater than the second opening value.

According to the embodiment of the invention, the opening degree of the third throttling element is accurately controlled according to the protection temperature of the compressor module, so that the reliability of the compressor during defrosting can be ensured, and defrosting can be rapidly realized.

Fig. 9 shows a schematic diagram of controlling the third throttling element to adjust the opening according to an embodiment of the present invention. And in the defrosting stage, the opening degree of the third throttling element is controlled according to the temperature Tf of the compressor module. Specifically, Tfmax is the maximum protection temperature of the compressor inverter, Tfmax-T1 is the first temperature threshold, Tfmax-T2 is the second temperature threshold, Tfmax-T3 is the third temperature threshold, Tfmax-T4 is the fourth temperature threshold, and Tfmax-T5 is the fifth temperature threshold.

Wherein Tfmax-T1, that is, the first temperature threshold is a temperature closer to the temperature of the compressor module Tf, and T1, T2, T3, T4 and T5 are preset constant temperature values, for example, T1 is 10 ℃, and T1< T2< T3< T4< T5 is satisfied. The first opening value is 16P, and the second opening value is 8P.

EXAMPLE thirteen

In some embodiments of the present invention, a control apparatus of an air conditioner is provided, and fig. 10 shows a schematic block diagram of a control apparatus 1500 of an air conditioner according to an embodiment of the present invention. The control device 1500 of the air conditioning apparatus includes: a memory 1502 on which programs or instructions are stored; the processor 1504, configured to execute a program or instructions to implement the control method of the air conditioning apparatus according to any of the embodiments described above.

In the control apparatus 1500 for an air conditioning device provided in this embodiment, the processor 1504 executes the program to implement the steps of the control method for an air conditioning device according to any of the above embodiments, so that the control apparatus 1500 for an air conditioning device includes all the advantageous effects of the control method for an air conditioning device according to any of the above embodiments.

Specifically, the cutoff device is controlled to open the bypass pipeline in response to a defrosting start instruction; and

and controlling the cutoff device to close the bypass pipeline in response to the defrosting end instruction.

Responding to a defrosting start instruction, controlling the fan to reduce the rotating speed, and controlling the second throttling element to reduce the opening degree; and

and controlling the opening degree of the third throttling element to be reduced to a preset opening degree.

Responding to a defrosting start instruction, and acquiring the operating frequency of the compressor;

and acquiring a corresponding preset opening in a preset comparison table according to the operating frequency.

After controlling the opening degree of the third throttling element to be reduced to the preset opening degree, the control method further comprises:

acquiring the current temperature of the controller;

and controlling a third throttling element to adjust the opening degree according to the comparison result of the current temperature and the temperature threshold value.

The temperature threshold comprises a first temperature threshold, a second temperature threshold, a third temperature threshold, a fourth temperature threshold and a fifth temperature threshold;

controlling a third throttling element to adjust the opening degree according to the comparison result of the current temperature and the temperature threshold, wherein the step of controlling the third throttling element to adjust the opening degree comprises the following steps:

controlling a third throttling element to be fully opened when the current temperature is greater than or equal to a first temperature threshold;

the current temperature is smaller than the first temperature threshold and is greater than or equal to the second temperature threshold, and the third throttling element is controlled to increase the first opening value;

the current temperature is smaller than the second temperature threshold and is greater than or equal to a third temperature threshold, and a third throttling element is controlled to increase a second opening value;

controlling a third throttling element to maintain a preset opening degree when the current temperature is less than a third temperature threshold and is more than or equal to a fourth temperature threshold;

the current temperature is smaller than the fourth temperature threshold and is greater than or equal to the fifth temperature threshold, and the third throttling element is controlled to reduce the second opening value;

controlling a third throttling element to reduce the first opening value when the current temperature is less than a fifth temperature threshold value;

wherein the first opening value is greater than the second opening value.

Acquiring an evaporation pressure value of the indoor heat exchanger;

and under the condition that the evaporation pressure value is lower than a preset pressure threshold value, controlling the second throttling element to reduce the opening degree until the evaporation pressure value is larger than the pressure threshold value.

When the air conditioning equipment is in a heating mode and needs defrosting, the air conditioning equipment does not switch to a cooling mode in response to a defrosting starting instruction, a bypass pipeline is arranged between an exhaust port of the compressor and an inlet of the outdoor heat exchanger, a cut-off device is arranged on the bypass pipeline, and the bypass pipeline is opened by controlling the cut-off device, so that part of high-temperature and high-pressure refrigerant enters the outdoor heat exchanger to be defrosted.

The air conditioning equipment also comprises a refrigerant heat dissipation device used for dissipating heat for the controller. And when the air conditioning equipment does not change the direction to defrost, responding to a defrosting starting instruction, and controlling the opening degree of the third throttling element to be reduced to a preset opening degree. And then obtaining the current temperature of the controller, comparing the current temperature with a temperature threshold value, and controlling a third throttling element to adjust the opening degree according to a comparison result.

Example fourteen

In some embodiments of the present invention, there is provided a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement the control method of an air conditioning apparatus as in any of the embodiments described above.

The present embodiment provides a readable storage medium, and the program is executed by a processor to implement the steps of the control method of the air conditioner according to any one of the above embodiments, and therefore the readable storage medium includes all the beneficial effects of the control method of the air conditioner according to any one of the above embodiments.

Specifically, when the air conditioning equipment is in a heating mode and needs defrosting, the air conditioning equipment does not switch to a cooling mode in response to a defrosting start instruction, a bypass pipeline is arranged between an exhaust port of the compressor and an inlet of the outdoor heat exchanger, a cut-off device is arranged on the bypass pipeline, and the bypass pipeline is opened by controlling the cut-off device, so that part of high-temperature and high-pressure refrigerant enters the outdoor heat exchanger to be defrosted.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An air conditioning apparatus, characterized by comprising:

a compressor comprising a discharge port and an intake port;

an outdoor heat exchanger;

a bypass line, a first end of which is connected to the exhaust port and a second end of which is connected to an inlet of the outdoor heat exchanger;

the cut-off device is arranged on the bypass pipeline;

the first throttling element is arranged on a refrigerant pipeline of the air inlet;

the electric heating device is arranged on a refrigerant pipeline of the air inlet and is positioned between the air inlet and the first throttling element;

and the controller is connected with the cutoff device and used for controlling the cutoff device to open or close the bypass pipeline according to a defrosting instruction.

2. The air conditioning apparatus as claimed in claim 1, further comprising:

at least one indoor heat exchanger connected with the outdoor heat exchanger;

the first end of the four-way valve is connected with the exhaust port, the second end of the four-way valve is connected with the outdoor heat exchanger, the third end of the four-way valve is connected with the indoor heat exchanger, and the fourth end of the four-way valve is connected with the air inlet.

3. The air conditioning apparatus as claimed in claim 2, further comprising:

an indoor fan disposed toward the indoor heat exchanger;

the second throttling element is arranged on an inlet pipeline of the indoor heat exchanger;

the controller is further used for controlling the second throttling element to reduce the opening degree according to the defrosting instruction and controlling the indoor fan to reduce the rotating speed.

4. The air conditioning apparatus as claimed in claim 3, further comprising:

the controller is connected with the third throttling element, and a second end of the bypass pipeline is positioned between the third throttling element and the inlet of the outdoor heat exchanger;

the controller is used for adjusting the opening degree of the third throttling element according to the evaporation pressure of the indoor heat exchanger; and

and controlling the opening degree of the third throttling element to be reduced to a preset opening degree according to the defrosting instruction.

5. The air conditioning apparatus as claimed in claim 4, further comprising:

and the refrigerant heat dissipation device is used for dissipating heat of the controller and is arranged on a refrigerant pipeline between the second throttling element and the third throttling element.

6. A control method of an air conditioning apparatus for controlling the air conditioning apparatus according to any one of claims 1 to 5, characterized by comprising:

responding to a defrosting start instruction, and controlling the cutoff device to open the bypass pipeline; and

and controlling the cutoff device to close the bypass pipeline in response to a defrosting end instruction.

7. The control method of an air conditioning apparatus according to claim 6, wherein the air conditioning apparatus includes an indoor fan, a second throttle member, and a third throttle member, the control method further comprising:

responding to the defrosting starting instruction, controlling the fan to reduce the rotating speed, and controlling the second throttling element to reduce the opening degree; and

8. The control method of an air conditioning apparatus according to claim 7, characterized by further comprising:

responding to the defrosting start instruction, and acquiring the operating frequency of the compressor;

and acquiring the corresponding preset opening in a preset comparison table according to the operating frequency.

9. The control method of the air conditioning equipment as claimed in claim 7, wherein the air conditioning equipment further comprises a refrigerant heat dissipating device for dissipating heat for the controller;

after the controlling the opening degree of the third throttling element to be reduced to a preset opening degree, the control method further includes:

acquiring the current temperature of the controller;

and controlling the third throttling element to adjust the opening degree according to the comparison result of the current temperature and the temperature threshold value.

10. The control method of an air conditioning apparatus according to claim 9, wherein the temperature threshold value includes a first temperature threshold value, a second temperature threshold value, a third temperature threshold value, a fourth temperature threshold value, and a fifth temperature threshold value;

the step of controlling the third throttling element to adjust the opening degree according to the comparison result of the current temperature and the temperature threshold value comprises the following steps:

the current temperature is greater than or equal to the first temperature threshold value, and the third throttling element is controlled to be fully opened;

the current temperature is smaller than the first temperature threshold and is greater than or equal to the second temperature threshold, and the third throttling element is controlled to increase a first opening value;

the current temperature is smaller than the second temperature threshold and is greater than or equal to the third temperature threshold, and the third throttling element is controlled to increase a second opening value;

the current temperature is smaller than the third temperature threshold and is greater than or equal to the fourth temperature threshold, and the third throttling element is controlled to maintain the preset opening degree;

controlling the third throttling element to reduce the first opening value when the current temperature is less than the fifth temperature threshold value;

wherein the first opening value is greater than the second opening value.

11. The control method of an air conditioning apparatus according to any one of claims 7 to 10, characterized in that the air conditioning apparatus further includes an indoor heat exchanger, the control method further comprising:

acquiring an evaporation pressure value of the indoor heat exchanger;

12. A control device of an air conditioning apparatus, characterized by comprising:

a memory having a program or instructions stored thereon;

a processor configured to implement the control method of the air conditioning apparatus according to any one of claims 6 to 11 when the program or the instructions are executed.

13. A readable storage medium on which a program or instructions are stored, characterized in that the program or instructions, when executed by a processor, implement the control method of an air conditioning apparatus according to any one of claims 6 to 11.