CN114322206A - Multi-split air conditioner and defrosting method, control device and storage medium thereof - Google Patents
Multi-split air conditioner and defrosting method, control device and storage medium thereof Download PDFInfo
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- CN114322206A CN114322206A CN202011068491.5A CN202011068491A CN114322206A CN 114322206 A CN114322206 A CN 114322206A CN 202011068491 A CN202011068491 A CN 202011068491A CN 114322206 A CN114322206 A CN 114322206A
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Abstract
The invention discloses a defrosting method of a multi-split air conditioner, wherein the multi-split air conditioner comprises an outdoor heat exchanger, a first indoor heat exchanger and a second indoor heat exchanger, the first indoor heat exchanger is connected with a first throttling device, the second indoor heat exchanger is connected with a second throttling device, and when the defrosting condition is met in the heating process of the air conditioner, a four-way valve is switched to a refrigerating loop; acquiring the states of each indoor unit, wherein the states comprise opened states and unopened states; closing a second throttling device of the opened indoor unit; and increasing the opening degree of a second throttling device of the unopened indoor unit to a first preset opening degree. The invention also discloses a multi-split air conditioner, a control device and a storage medium. When the invention switches from heating to defrosting, a refrigeration loop of the indoor unit which is not started is started to refrigerate and defrost, and a heating loop of the started indoor unit keeps heating continuously, so that the temperature fluctuation of the room where the indoor unit is started can be effectively reduced while defrosting, and the influence on the environmental comfort level is avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioner, a defrosting method, a control device and a storage medium thereof.
Background
When the air conditioner heats under a low-temperature working condition, the heat exchanger of the outdoor unit is easy to frost, the heat exchange efficiency of the frosted outdoor heat exchanger is rapidly reduced, and the heat exchange effect is seriously influenced, so that the air conditioner generally enters a defrosting mode when the air conditioner operates for a period of time in a low-temperature operating environment or the outdoor heat exchanger frosts, and frost on the outdoor heat exchanger is removed.
The existing defrosting mode of the air conditioner is to switch the air conditioner from a heating mode to a cooling mode for defrosting, however, after the heating mode is switched to the cooling mode, the indoor temperature is reduced, and the heating effect of the air conditioner is further affected. Especially, the multi-split air conditioner has a good heat exchange effect based on the multi-split air conditioner, and when the heating mode is switched to the cooling mode, the indoor temperature can drop rapidly, so that the indoor temperature fluctuates seriously.
It should be noted that the above-mentioned contents are only for assisting understanding of the technical problems solved by the present invention, and do not represent an admission that the above-mentioned contents are the prior art.
Disclosure of Invention
The invention mainly aims to provide a multi-split air conditioner, a defrosting method, a control device and a storage medium thereof, and aims to solve the problem that the indoor temperature of the multi-split air conditioner is sharply reduced in the defrosting process to cause serious fluctuation of the indoor temperature.
In order to achieve the aim, the invention provides a defrosting method of a multi-split air conditioner, wherein the multi-split air conditioner comprises an outdoor unit and at least two indoor units, the outdoor unit comprises a compressor, a four-way valve and an outdoor heat exchanger, and each indoor unit comprises a first indoor heat exchanger, a second indoor heat exchanger, a first throttling device and a second throttling device; four interfaces of the four-way valve are respectively connected with an exhaust port of the compressor, an outdoor heat exchanger, a second indoor heat exchanger and a return air port of the compressor, a first interface of the first indoor heat exchanger is connected with the exhaust port of the compressor, a first interface of the first indoor heat exchanger is connected with the outdoor heat exchanger after passing through the first throttling device, a first interface of the second indoor heat exchanger is connected with the four-way valve, and a second interface of the second indoor heat exchanger is connected with the outdoor heat exchanger after passing through the second throttling device; the defrosting method of the multi-split air conditioner comprises the following steps:
when the defrosting condition is met in the heating process of the air conditioner, the four-way valve is switched to enable the exhaust port of the compressor to be communicated with the outdoor heat exchanger;
acquiring the state of each indoor unit, wherein the state comprises opened state and unopened state;
closing a second throttling device of the opened indoor unit;
and increasing the opening degree of a second throttling device of the unopened indoor unit to a first preset opening degree.
Optionally, after the step of increasing the opening degree of the second throttling device of the unopened indoor unit to the first preset opening degree:
and after defrosting is finished, reducing the opening degree of a second throttling device of the unopened indoor unit to a second preset opening degree, wherein the first preset opening degree is larger than the second preset opening degree.
Optionally, while the step of reducing the second throttling device of the unopened indoor unit to a second preset opening degree is executed, the method further executes:
switching the four-way valve to communicate the exhaust port of the compressor with the second indoor heat exchanger;
and opening the second throttling device of the started indoor unit to a third preset opening degree.
Optionally, the outdoor unit further comprises a first switch valve and a second switch valve, the second switch valve is arranged on a pipeline connecting the first indoor heat exchanger and the exhaust port of the compressor, and the second switch valve is arranged on a pipeline connecting the first indoor heat exchanger and the return port of the compressor; after the step of increasing the opening degree of the second throttling device of the unopened indoor unit to the first preset opening degree:
acquiring the temperature change rate of the outdoor heat exchanger within a preset time interval;
when the temperature change rate is smaller than or equal to a preset value, closing the first switch valve and opening the second switch valve;
or when the temperature change rate is smaller than or equal to a preset value, closing the first switch valve, opening the second switch valve, and opening the second throttling device of the started indoor unit and/or the first throttling device of the unopened indoor unit.
Optionally, the obtaining the state of each indoor unit, where the state includes after the step of being turned on and not turned on, further includes:
when all the indoor units are started, acquiring a target indoor unit, wherein no user exists in an action interval of the target indoor unit;
closing second throttling devices of other indoor units except the target indoor unit;
and increasing the opening degree of a second throttling device of the target indoor unit to a first preset opening degree.
Optionally, when a defrosting instruction is received, determining that a defrosting condition is met;
or judging that the defrosting condition is met when the heating time reaches the preset time.
The invention also provides a defrosting method of the multi-split air conditioner, wherein the multi-split air conditioner comprises an outdoor unit and at least two indoor units, the outdoor unit comprises a compressor, a four-way valve and an outdoor heat exchanger, and each indoor unit comprises a first indoor heat exchanger, a second indoor heat exchanger, a first throttling device and a second throttling device; four interfaces of the four-way valve are respectively connected with an exhaust port of the compressor, an outdoor heat exchanger, a second indoor heat exchanger and a return air port of the compressor, a first interface of the first indoor heat exchanger is connected with the exhaust port of the compressor, a second interface of the first indoor heat exchanger is connected with the outdoor heat exchanger after passing through the first throttling device, a first interface of the second indoor heat exchanger is connected with the four-way valve, and a second interface of the second indoor heat exchanger is connected with the outdoor heat exchanger after passing through the second throttling device; the defrosting method of the multi-split air conditioner comprises the following steps:
when the defrosting condition is met in the heating process of the air conditioner, the four-way valve is switched to enable the exhaust port of the compressor to be communicated with the outdoor heat exchanger;
obtaining a target indoor unit, wherein no user exists in an action interval of the target indoor unit;
closing second throttling devices of other indoor units except the target indoor unit;
and increasing the opening degree of a second throttling device of the target indoor unit to a first preset opening degree.
In view of the above, the present invention also provides a multi-split air conditioner, which includes a memory, a processor, and a defrosting program stored in the memory and operable on the processor, wherein the defrosting program, when executed by the processor, implements the steps of the multi-split air conditioner defrosting method as described above.
In view of the above objects, the present invention also provides a control device, which includes a memory, a processor, and a defrosting program stored in the memory and executable on the processor, wherein the defrosting program, when executed by the processor, implements the steps of the defrosting method of the multi-split air conditioner as described above.
In addition, the present invention also provides a storage medium storing a defrosting program that implements the respective steps of the multi-split air conditioner defrosting method as described above when the defrosting program is executed by a processor.
According to the multi-split air conditioner and the defrosting method, the control device and the storage medium thereof, when the defrosting condition is met in the heating process of the air conditioner, the four-way valve is switched to the channel corresponding to refrigeration, so that part of high-temperature and high-pressure refrigerant discharged by the compressor is directly discharged into the outdoor heat exchanger to defrost the outdoor heat exchanger, meanwhile, the opening degree of a second throttling device of the indoor unit which is not started is increased to a first preset opening degree, so that the refrigerant subjected to heat exchange of the outdoor heat exchanger flows to the second throttling device of the indoor unit which is not started and the second indoor heat exchanger, and flows back into the compressor after heat exchange in the second indoor heat exchanger, and the initiation of the refrigeration cycle is realized; meanwhile, the second throttling device of the opened indoor unit is also closed, so that the refrigerant defrosted by the outdoor heat exchanger is prevented from flowing to the second throttling device and further entering the second indoor heat exchanger to absorb heat, the temperature of the environment where the indoor unit is opened is influenced, the first indoor heat exchanger of the opened indoor unit keeps a heating loop to continue heating, the temperature fluctuation of the room where the indoor unit is opened can be effectively reduced while the outdoor heat exchanger is defrosted, and the influence on the environmental comfort level is avoided.
Drawings
FIG. 1 is a schematic diagram of a hardware architecture of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic view of a circulation flow path in a defrosting process of a multi-split air conditioner according to the present invention;
fig. 3 is a schematic flow chart illustrating a defrosting method of a multi-split air conditioner according to a first embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a defrosting method for a multi-split air conditioner according to a second embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a defrosting method for a multi-split air conditioner according to a third embodiment of the present invention;
FIG. 6 is a schematic flow chart illustrating a defrosting method for a multi-split air conditioner according to a fourth embodiment of the present invention;
fig. 7 is a schematic flow chart illustrating a defrosting method of a multi-split air conditioner according to a fifth embodiment of the invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
20 | |
| 11 | |
21 | First |
| 12 | Four- |
22 | Second |
| 13 | |
23 | First throttling means |
| 14 | First of allSwitch |
24 | Second throttling means |
| 15 | |
16 | |
| 17 | |
18 | |
| 19 | |
111 | Gas-liquid separator |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main technical scheme of the embodiment of the invention is as follows: the embodiment is applied to the heating and defrosting process of a three-pipe multi-split air conditioner, and particularly when the defrosting condition is met in the heating process of the air conditioner, the four-way valve is switched to enable the exhaust port of the compressor to be communicated with the outdoor heat exchanger; acquiring the state of each indoor unit, wherein the state comprises opened state and unopened state; closing a second throttling device of the opened indoor unit; and increasing the opening degree of a second throttling device of the unopened indoor unit to a first preset opening degree.
For a better understanding of the above technical solutions, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As one implementation manner, the hardware environment architecture involved in the defrosting method of the multi-split air conditioner may be as shown in fig. 1.
Specifically, the hardware architecture related to the defrosting method of the multi-split air conditioner may include the multi-split air conditioner or a control device of the multi-split air conditioner, such as a mobile terminal, a central control device of the multi-split air conditioner, and a terminal with a display interface, such as a large screen; it is understood that the hardware architecture may also be composed of a control device and a multi-split air conditioner, for example, the control device is a mobile terminal or a central control device, the control device is in communication connection with the multi-split air conditioner, and the control device controls the multi-split air conditioner to perform a defrosting operation.
As one implementation, the multi-split air conditioner or the control device includes: a processor 101, e.g. a CPU, a memory 102, a communication bus 103. Wherein a communication bus 103 is used for enabling the connection communication between these components. The processor 102 is configured to call an application program to control related components of the multi-split air conditioner to perform a defrosting function.
The memory 102 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory).
It is understood that, in an embodiment, a defrosting program for implementing the defrosting process of the multi-split air conditioner is stored in the memory 102 of the multi-split air conditioner, and when the processor 101 calls the defrosting program from the memory 102, the following operations are performed:
when the defrosting condition is met in the heating process of the air conditioner, the four-way valve is switched to enable the exhaust port of the compressor to be communicated with the outdoor heat exchanger;
acquiring the state of each indoor unit, wherein the state comprises opened state and unopened state;
closing a second throttling device of the opened indoor unit;
and increasing the opening degree of a second throttling device of the unopened indoor unit to a first preset opening degree.
Or performing the following operations:
when the defrosting condition is met in the heating process of the air conditioner, the four-way valve is switched to enable the exhaust port of the compressor to be communicated with the outdoor heat exchanger;
obtaining a target indoor unit, wherein no user exists in an action interval of the target indoor unit;
closing second throttling devices of other indoor units except the target indoor unit;
and increasing the opening degree of a second throttling device of the target indoor unit to a first preset opening degree.
Based on the hardware framework of the air conditioner, various embodiments of the defrosting method of the multi-split air conditioner are provided, and the various embodiments of the defrosting method of the multi-split air conditioner are used for defrosting in the heating process of the multi-split air conditioner. When the multi-split air conditioner heats in a low-temperature environment, the outer surface of the outdoor heat exchanger is easy to frost, and the heating effect is seriously affected after the outer surface of the outdoor heat exchanger frosts, so that the multi-split air conditioner needs to perform defrosting treatment on the outdoor heat exchanger at regular time or irregular time in the heating operation process.
It should be noted that, based on the heat exchange structure that the multi-split air conditioner is an outdoor unit and at least two indoor units, the multi-split air conditioner is different from a common air conditioner in that the indoor units can be independently turned on or off, that is, during the working process of the multi-split air conditioner, part of the indoor units can be turned on and part of the indoor units can be turned off. Based on the characteristics of the multi-split air conditioner, the multi-split air conditioner applied to the embodiment of the invention can continuously heat in the defrosting process, maintain the indoor environment temperature and avoid the indoor temperature fluctuation by combining the characteristics that the indoor unit in the three-pipe multi-split air conditioner has two indoor heat exchangers.
Specifically, referring to fig. 2, the multi-split air conditioner includes an outdoor unit 10 and at least two indoor units 20, and the outdoor unit 10 is connected to the at least two indoor units 20. Specifically, the outdoor unit 10 includes a compressor 11, a four-way valve 12, and an outdoor heat exchanger 13, and each of the indoor units 20 includes a first indoor heat exchanger 21, a second indoor heat exchanger 22, a first throttling device 23, and a second throttling device 24; four interfaces of the four-way valve 12 are respectively connected with an exhaust port of the compressor 11, the outdoor heat exchanger 13, the second indoor heat exchanger 22 and a return air port of the compressor 11, a first interface of the first indoor heat exchanger 21 is connected with the compressor 11, a second interface of the first indoor heat exchanger 21 passes through the first throttling device 23 and then is connected with the outdoor heat exchanger 13, a first interface of the second indoor heat exchanger 22 is connected with the four-way valve 12, and a second interface of the second indoor heat exchanger 22 passes through the second throttling device 24 and then is connected with the outdoor heat exchanger 13. A first port of the first indoor heat exchanger 21 is connected to a discharge port of the compressor 11 through a first pipeline 16, and a second port of the first indoor heat exchanger 21 is connected to a return port of the compressor 11 through a second pipeline 17. The outdoor unit 10 further includes a first switching valve 14 and a second switching valve 15, the first switching valve 14 is disposed on a pipeline connecting the first indoor heat exchanger 21 and the discharge port of the compressor 11, that is, on the first pipeline 16, and the second switching valve 15 is disposed on a pipeline connecting the first port of the first indoor heat exchanger 21 and the return port of the compressor 11, that is, on the second pipeline 17.
It should be noted that the four-way valve 12 includes a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is connected to the exhaust port of the compressor 11, the second valve port is connected to the outdoor heat exchanger 13, and the third valve port is connected to the return air port of the compressor 11; the fourth valve port is connected with the first interface of the second heat exchanger. When the passage between the first port and the second port is communicated, the passage between the third port and the fourth port is communicated, and when the passage between the first port and the fourth port is communicated, the passage between the second port and the third port is communicated.
In this embodiment, the multi-split air conditioner is a three-tube multi-split air conditioner, and the three tubes are respectively referred to as an outdoor heat exchanger 13 and two indoor heat exchangers (a first indoor heat exchanger 21 and a second indoor heat exchanger 22). The three-pipe multi-split air conditioner has the functions of heating, refrigerating, defrosting and the like.
Specifically, the heating system of the multi-split air conditioner: a third pipeline 18 and a fourth pipeline 19 are connected to an exhaust port of the compressor 11, the third pipeline 18 is connected to a first interface of the first indoor heat exchanger 21, a refrigerant in the compressor 11 sequentially flows to the first indoor heat exchanger 21, the first throttling device 23 and the outdoor heat exchanger 13 through the third pipeline 18, and then flows back into the compressor 11 through the four-way valve 12 to form a first heating loop, it should be noted that the refrigerant in the first heating loop does not flow through the four-way valve 12, so that the conduction or the closing of the first heating loop is controlled by the first throttling device 23 and the first switch valve 14; the fourth pipeline 19 is connected to the four-way valve 12, and refrigerant discharged from the compressor 11 flows through the four-way valve 12, then sequentially flows to the second indoor heat exchanger 22, the second throttling device 24, and the outdoor heat exchanger 13, and then flows back into the compressor 11 through the four-way valve 12, thereby forming a second heating loop.
Heating principle of the multi-split air conditioner: switching the four-way valve 12 to make the first valve port and the fourth valve port conducted, the second valve port and the third valve port conducted, opening the first switch valve 14 on the first pipeline 16, closing the second switch valve 15 on the second pipeline 17, allowing a high-temperature and high-pressure refrigerant discharged from the compressor 11 to flow through the first valve port and the fourth valve port of the four-way valve 12 to the second indoor heat exchanger 22 of each indoor unit 20, releasing heat through the second indoor heat exchanger 22, throttling through the second throttling device 24, flowing to the outdoor heat exchanger 13, absorbing heat through the outdoor heat exchanger 13, and returning to the compressor 11 through the second valve port and the third valve port of the four-way valve 12 to form the second heating loop for circulating heating. The first throttling device 23 and the first switch valve 14 are opened, a high-temperature and high-pressure refrigerant part discharged by the compressor 11 flows to the first indoor heat exchanger 21 of each indoor unit 20 through the first pipeline 16, is throttled by the first throttling device 23 after heat is released by the first indoor heat exchanger 21, then flows to the outdoor heat exchanger 13, absorbs heat by the outdoor heat exchanger 13, and then flows back into the compressor 11 through the second valve port and the third valve port of the four-way valve 12, so that the first heating loop is formed for circulating heating.
Refrigeration system of multi-split air conditioner: the refrigerant discharged from the compressor 11 flows to the outdoor heat exchanger 13 after passing through the four-way valve 12, then flows from the outdoor heat exchanger 13 to the first throttling device 23 and the first indoor heat exchanger 21, and flows back into the compressor 11 from the second interface of the first indoor heat exchanger 21 to form a first refrigeration loop, and/or flows from the outdoor heat exchanger 13 to the second throttling device 24 and the second indoor heat exchanger 22, and flows into the compressor 11 through the four-way valve 12 to form a second refrigeration loop. As can be seen, after being discharged from the compressor 11, the refrigerants in the first refrigeration circuit and the second refrigeration circuit both need to flow to the outdoor heat exchanger 13, the indoor heat exchanger, and the like through the four-way valve 12, and when the first refrigeration circuit and the second refrigeration circuit are different, the first refrigeration circuit does not return to the compressor 11 through the four-way valve 12, and the second refrigeration circuit returns to the compressor 11 through the four-way valve 12.
Refrigeration principle of the multi-split air conditioner: switching the four-way valve 12 to enable the first valve port to be communicated with the second valve port, the third valve port to be communicated with the fourth valve port, closing the first switch valve 14 on the first pipeline 16, opening the second switch valve 15 on the second pipeline 17, allowing the high-temperature and high-pressure refrigerant discharged by the compressor 11 to flow to the outdoor heat exchanger 13 after passing through the first valve port and the second valve port of the four-way valve 12, releasing heat through the outdoor heat exchanger 13, allowing part of the refrigerant to flow to the first throttling device 23, throttling the refrigerant by the first throttling device 23 and flowing to the first indoor heat exchanger 21, absorbing heat in the first indoor heat exchanger 21, and returning the refrigerant to the compressor 11 through the second pipeline 17 to form the first refrigeration loop for circulating refrigeration; part of the refrigerant flows to the second throttling device 24, flows to the second indoor heat exchanger 22 after being throttled by the second throttling device 24, and returns to the compressor 11 through the third valve port and the fourth valve port of the four-way valve 12 after absorbing heat in the second indoor heat exchanger 22, so that the second refrigeration loop is formed for circulating refrigeration.
The specific process of switching heating to defrosting is explained in conjunction with the following embodiments.
The first throttle device 23 and the second throttle device 24 may be electronic expansion valves, capillary tubes, or the like; the first and second switching valves 14 and 15 may be solenoid valves, electronic expansion valves, or the like. The outdoor unit 10 further includes a gas-liquid separator 111, the gas-liquid separator 111 is disposed at a return port of the compressor 11, a third port of the four-way valve 12 is connected to a return port of the compressor 11 through the gas-liquid separator 111, and a first port of the first indoor heat exchanger 21 is connected to the return port of the compressor 11 through the gas-liquid separator.
Referring to fig. 3, a defrosting method of a multi-split air conditioner according to a first embodiment of the present invention includes the following steps:
step S10, when the defrosting condition is met in the heating process of the air conditioner, the four-way valve is switched to enable the exhaust port of the compressor to be communicated with the outdoor heat exchanger;
step S20, obtaining the state of each indoor unit, wherein the state comprises opened state and unopened state;
step S30, closing the second throttle device of the opened indoor unit;
and step S40, increasing the opening degree of the second throttling device of the unopened indoor unit to a first preset opening degree.
The execution terminal of the embodiment may be a control device of the multi-split air conditioner, or may be the local end of the multi-split air conditioner. In this embodiment, the defrosting method of the multi-split air conditioner is performed at the local end of the air conditioner for example.
In the operation heating process of the air conditioner, a refrigerant circulates in the first heating loop and the second heating loop to heat. At this time, the first valve port and the fourth valve port of the four-way valve are communicated, the second valve port and the third valve port are communicated, the first throttling device and the second throttling device are both opened, the first switch valve is opened, and the second switch valve is closed. It should be noted that, during the operation of the multi-split air conditioner, part of the indoor units may be turned on, and part of the indoor units may be turned off, so that the operating states of the first throttling device and the second throttling device are for the turned-on indoor units, and the first throttling device and the second throttling device are in the standby opening degree (smaller opening degree) during the heating or cooling operation without turning on the indoor units.
When the multi-split air conditioner heats in a low-temperature environment, the outdoor heat exchanger is easy to frost, so that the outdoor heat exchanger needs to be defrosted under the defrosting condition when the air conditioner operates to heat, and the condition that the heat exchange effect is poor due to frosting is avoided. The method for judging whether the defrosting condition is met in the heating process of the air conditioner includes a plurality of judgment modes, two judgment modes are taken as examples for explanation, when a defrosting instruction is received, the defrosting condition is judged to be met, a user can send the defrosting instruction to the air conditioner through a remote controller or a mobile terminal, and after the defrosting instruction is received by the air conditioner, the defrosting condition is judged to be met, and defrosting starts to operate. Or, if the heating time reaches the preset time, determining that a defrosting condition is met, namely, setting the heating preset time for the air conditioner to operate in a low-temperature environment, starting defrosting, and when the operating time of the air conditioner reaches the preset time, automatically operating a defrosting mode and the like.
Based on the structural characteristics, when the defrosting condition is met in the heating process, at least one heating loop of the started indoor unit is continuously maintained to heat, and one refrigerating cycle loop of the unopened indoor unit is started to defrost the outdoor heat exchanger (in the refrigerating cycle loop, high-temperature and high-pressure refrigerant directly flows to the outdoor heat exchanger, and the high-temperature and high-pressure refrigerant improves the pipe temperature of the outdoor heat exchanger, so that the outdoor heat exchanger is melted on the surface). The defrosting mode can keep the indoor unit corresponding to the room where people exist to keep heating operation so as to maintain the indoor environment temperature and reduce the indoor temperature fluctuation, and the temperature of the room where the indoor unit is started can be stably maintained while defrosting the outdoor heat exchanger is realized. And for the room without the indoor unit, no person is in the room, the indoor temperature is reduced in the process of cooling and absorbing heat of the heat exchanger of the indoor unit, the user is not influenced, the throttling device based on the indoor unit is in the standby opening degree and is not completely closed, the heating loop which is the same as the heating loop of the indoor unit is still in heating operation, and the indoor temperature can be prevented from being reduced too fast to a certain extent.
Specifically, referring to fig. 2, when the heating process of the air conditioner satisfies the defrosting condition, the four-way valve 12 is switched to the refrigeration loop, and meanwhile, the state of each indoor unit 20 is obtained, such as the opened state or the unopened state, the second throttling device 24 of the opened indoor unit 20 is closed, and the opening degree of the second throttling device 24 of the unopened indoor unit 20 is increased to a first preset opening degree, it should be noted that the second throttling device 24 of the unopened indoor unit 20 is not completely closed in the standby state and is at the standby opening degree, and the first preset opening degree is greater than the standby opening degree, and in some embodiments, the first preset opening degree is a preferred opening degree in the defrosting mode obtained after a test.
That is, the first valve port and the second valve port of the four-way valve 12 are communicated to communicate the exhaust port of the compressor 11 with the outdoor heat exchanger 13, a high-temperature and high-pressure refrigerant discharged by the compressor 11 partially flows into the outdoor heat exchanger 13 to be supplied to the outdoor heat exchanger 13 for heat and frost release, the refrigerant released by the outdoor heat exchanger 13 flows to the second throttling device 24 of the unopened indoor unit 20 based on the fact that the second throttling device 24 of the unopened indoor unit 20 is opened to the first preset opening degree, then enters the second indoor heat exchanger 22 of the unopened indoor unit 20 for heat absorption, and then flows back to the compressor 11 through the third valve port and the fourth valve port of the four-way valve 12, so that refrigeration and frost release of the second refrigeration circuit of the unopened indoor unit 20 are realized. Since the second throttling device 24 of the opened indoor unit 20 is closed, the refrigerant flowing out of the outdoor heat exchanger 13 does not flow to the second throttling device 24 of the opened indoor unit 20, and thus the second indoor heat exchanger 22 of the opened indoor unit 20 does not perform heat absorption operation, and does not affect the ambient temperature of the room in which the opened indoor unit 20 is located. Meanwhile, a high-temperature and high-pressure refrigerant discharged from the compressor 11 continuously flows from the first pipeline to the first heat exchanger of the opened indoor unit 20 to release heat (that is, to heat, the first throttling device 23 of the unopened indoor unit 20 is in a standby opening, and only a small part of the refrigerant flows to the corresponding first indoor heat exchanger 21 at this time), then flows through the first throttling device 23 of the opened indoor unit 20, joins the refrigerant flowing out of the outdoor heat exchanger 13, flows to the second throttling device 24 and the second indoor heat exchanger 22 of the unopened indoor unit 20, absorbs heat in the second indoor heat exchanger 22, and then flows back to the compressor 11 through the third valve port and the fourth valve port of the four-way valve 12, so that the first heating loop of the opened indoor unit 20 performs circulating heating. The first heating circulation loop based on the started indoor unit 20 always keeps heating operation, so that the indoor temperature of the started indoor unit 20 is always kept in a comfortable range, and the influence on the indoor environment temperature in the refrigerating and defrosting process is reduced.
It should be noted that, in this embodiment, the operation of switching the four-way valve 12 may be executed simultaneously with step S30 and step S40, or may have a sequential order, and the order of step S30 and step S40 may be exchanged, which is not limited herein.
When the defrosting condition is met in the heating process of the air conditioner in the embodiment, the four-way valve 12 is switched to the channel corresponding to refrigeration, so that part of high-temperature and high-pressure refrigerant discharged by the compressor 11 is directly discharged into the outdoor heat exchanger 13 to defrost the outdoor heat exchanger 13, meanwhile, the opening degree of the second throttling device 24 of the indoor unit 20 which is not opened is increased to the first preset opening degree, so that the refrigerant subjected to heat exchange by the outdoor heat exchanger 13 flows to the second throttling device 24 and the second indoor heat exchanger 22 of the indoor unit 20 which are not opened, and flows back into the compressor 11 after heat exchange in the second indoor heat exchanger 22, and the initiation of a refrigeration cycle is realized; meanwhile, the second throttling device 24 of the opened indoor unit 20 is also closed, so that the refrigerant defrosted by the outdoor heat exchanger 13 is prevented from flowing to the second throttling device 24 and further enters the second indoor heat exchanger 22 to absorb heat, and the temperature of the environment where the indoor unit is opened is influenced, the first indoor heat exchanger 21 of the opened indoor unit 20 keeps a heating loop to continue heating, the temperature fluctuation of the room where the indoor unit 20 is opened can be effectively reduced while the outdoor heat exchanger 13 defrostes, and the influence on the environmental comfort level is avoided.
Further, based on the first embodiment, in a second embodiment of the multiple defrosting method according to the embodiment of the present invention, referring to fig. 4, after the step of increasing the opening degree of the second throttling device of the unopened indoor unit to the first preset opening degree:
step S50, after defrosting is finished, the opening degree of a second throttling device of the unopened indoor unit is reduced to a second preset opening degree; the first preset opening degree is larger than the second preset opening degree.
In this embodiment, the second preset opening is the standby opening, and after defrosting is finished, the second throttling device of the indoor unit is returned to the standby opening.
That is, after the defrosting of the air conditioner is finished, the refrigeration cycle of the second refrigeration loop corresponding to the indoor unit which is not started can be directly closed, and the first heating loop of the started indoor unit is kept heating.
Or, further, in order to make the indoor temperature more comfortable and make the indoor heat exchange effect higher, the step of reducing the opening degree of the second throttling device of the unopened indoor unit to a second preset opening degree is performed while:
step S60, switching a four-way valve to enable an exhaust port of the compressor to be communicated with a first interface of the second indoor heat exchanger;
and step S70, opening the second throttling device of the opened indoor unit to a third preset opening degree.
That is, after the defrosting of the air conditioner is finished, the cooling mode is switched to the heating mode, and meanwhile, the second throttling device of the started indoor unit is opened to a third preset opening degree (namely, a heating opening degree, which may be an opening degree before the defrosting or an opening degree determined based on the current indoor environment temperature), so that the started indoor unit maintains the heating effect before the defrosting.
Specifically, after defrosting is finished, the four-way valve is switched to a heating mode, at the moment, the first valve port and the fourth valve port of the four-way valve are communicated, the second valve port and the third valve port are communicated, part of high-temperature and high-pressure refrigerant discharged by the compressor flows to a second indoor heat exchanger of each indoor unit after passing through the first valve port and the fourth valve port of the four-way valve, is throttled by the second throttling device after releasing heat by the second indoor heat exchanger, then flows to the outdoor heat exchanger, and flows back into the compressor through the second valve port and the third valve port of the four-way valve after absorbing heat by the outdoor heat exchanger, so that the second heating loop is formed for circulating heating. The high-temperature and high-pressure refrigerant discharged by the compressor flows to the first indoor heat exchanger of each indoor unit through the first pipeline, is throttled by the first throttling device after being released by the heat of the first indoor heat exchanger, then flows to the outdoor heat exchanger, and flows back into the compressor through the second valve port and the third valve port of the four-way valve after being absorbed by the outdoor heat exchanger, so that the first heating loop is formed for heating circularly. The double heat exchangers of the air conditioner can simultaneously heat, and the heating effect is better.
Further, referring to fig. 5, the present embodiment provides a third embodiment of a defrosting method for a multi-split air conditioner based on all the above embodiments. In this embodiment, the outdoor unit of the multi-split air conditioner further includes a first switch valve and a second switch valve, the second switch valve is disposed on a pipeline connecting the first indoor heat exchanger and the exhaust port of the compressor, and the second switch valve is disposed on a pipeline connecting the first indoor heat exchanger and the return port of the compressor; after the step of increasing the opening degree of the second throttling device of the unopened indoor unit to the first preset opening degree:
step S80, acquiring the temperature change rate of the outdoor heat exchanger within a preset time interval;
step S90, when the temperature change rate is smaller than or equal to a preset value, closing the first switch valve and opening the second switch valve;
or, in step S100, when the temperature change rate is less than or equal to a preset value, closing the first switch valve, opening the second switch valve, and opening the second throttling device of the opened indoor unit and/or the first throttling device of the unopened indoor unit.
In this embodiment, if the air conditioner operates to heat in an extremely low temperature environment, and the frosting on the outdoor heat exchanger is severe, the defrosting mode of the first embodiment is not necessarily adopted to defrost, and therefore, after the defrosting process of the first embodiment is executed for a preset time period, the temperature change rate of the outdoor heat exchanger within a preset time interval is obtained, and the defrosting effect of the outdoor heat exchanger is determined by determining whether the temperature change rate meets the defrosting requirement. If the temperature change rate is smaller than or equal to the preset value, it is determined that the defrosting mode in the first embodiment does not meet the defrosting requirement, at this time, the air conditioner is switched to a full-refrigeration mode (that is, both the first refrigeration loop and the second refrigeration loop of the multi-split air conditioner perform refrigeration), and the indoor unit is switched to a refrigeration defrosting mode when being started or not started, so that the defrosting effect is improved. In the defrosting process, the surface temperature of the outdoor heat exchanger gradually rises, and compared with the frosting on the surface of the outdoor heat exchanger, the frosting on the surface of the outdoor heat exchanger is gradually reduced, the preset value is a corresponding temperature change value determined according to an experiment when the frosting on the surface of the outdoor heat exchanger is gradually reduced, and the temperature change value is larger than 0.
Specifically, when the temperature change rate is less than or equal to a preset value, the first switching valve on the first pipeline is closed, so that the high-temperature and high-pressure refrigerant discharged by the compressor flows to the four-way valve completely, and then flows to the outdoor heat exchanger through the first valve port and the second valve port of the four-way valve, so that a refrigerant flow path for defrosting the outdoor heat exchanger is increased, and the defrosting efficiency is improved. And simultaneously, opening a second switch valve on the second pipeline so that the first refrigeration circuit and the second refrigeration circuit of the air conditioner both execute refrigeration and defrosting operation. Or, in order to improve the refrigeration effect and further improve the defrosting effect, the first switch valve is closed, the second throttle device of the opened indoor unit and/or the first throttle device of the unopened indoor unit are/is opened while the second switch valve is opened, so that the double heat exchangers of all the indoor units are refrigerated simultaneously, the refrigeration effect is improved, and the defrosting effect is further improved.
Further, referring to fig. 6, the present embodiment provides a fourth embodiment of a defrosting method for a multi-split air conditioner based on all the above embodiments, where the acquiring states of the indoor units includes, after the steps of being turned on and not turned on, the method further includes:
step S110, when all the indoor units are started, acquiring a target indoor unit, wherein no user exists in an action interval of the target indoor unit;
step S120, closing second throttling devices of other indoor units except the target indoor unit;
and step S130, increasing the opening degree of a second throttling device of the target indoor unit to a first preset opening degree.
In this embodiment, the multi-split air conditioner may be started by a part of the indoor units, or may be started by all the indoor units. And if all the indoor units of the multi-split air conditioner are started to heat and meet defrosting conditions, defrosting control is performed according to whether users exist in the action section of the indoor units.
It should be noted that, because the room where the user exists has temperature fluctuation, which affects comfort of the user to the environment in the room, and the room where the user does not exist has temperature fluctuation, which does not affect the user, based on this, the present embodiment controls the heating loop of the indoor unit corresponding to the room where the user exists to keep heating, and switches the indoor unit corresponding to the room where the user does not exist to the cooling defrosting, so as to defrost the outdoor heater while maintaining the temperature of the room where the user exists, and avoid affecting comfort of the environment in the defrosting process.
Specifically, a target indoor unit without a user in an action interval is determined, then second throttling devices of other indoor units except the target indoor unit are closed, the opening degree of the second throttling device of the target indoor unit is increased to a first preset opening degree, part of high-temperature and high-pressure refrigerant discharged by a compressor flows into the outdoor heat exchanger through the four-way valve to supply heat and frost to the outdoor heat exchanger, and the refrigerant flowing through the outdoor heat exchanger flows to the second throttling device of the target indoor unit based on the condition that the second throttling device of the target indoor unit without the user is opened to the first preset opening degree, and then the refrigerant enters a second indoor heat exchanger of the target indoor unit to absorb heat, and then the refrigerant flows back into a compressor through a third valve port and a fourth valve port of the four-way valve, so that the refrigeration and defrosting of a second refrigeration loop of the target indoor unit are realized. And when the second throttling devices in the indoor units except the target indoor unit are closed, the refrigerant does not flow to the second throttling devices of the indoor units except the target indoor unit after flowing out of the outdoor heat exchanger, so that the second indoor heat exchangers of the indoor units except the target indoor unit do not perform heat absorption work, and the ambient temperature of the room where the indoor units except the target indoor unit are located is not influenced. Meanwhile, the high-temperature and high-pressure refrigerant discharged by the compressor continuously flows to the first heat exchangers of other indoor units except the target indoor unit from the first pipeline to release heat (namely heating, the first throttling device of the target indoor unit is in a standby opening degree, only a small part of the refrigerant flows to the corresponding first indoor heat exchanger at the moment), then flows through the first throttling devices of the other indoor units except the target indoor unit, is merged with the refrigerant flowing out of the outdoor heat exchanger, flows to the second throttling device and the second indoor heat exchanger of the target indoor unit, absorbs heat in the second indoor heat exchanger, and then flows back to the compressor through the third valve port and the fourth valve port of the four-way valve, so that the first heating loop of the indoor unit is started to circularly heat. And on the basis that the first heating circulation loops of other indoor units except the target indoor unit are always kept in heating operation, the indoor temperatures of the other indoor units except the target indoor unit are always kept in a comfortable range, and the influence on the indoor environment temperature in the refrigerating and defrosting process is reduced.
In the embodiment, when all the indoor units are in the opening state, the second heat exchanger corresponding to the indoor unit without the user is controlled to run for refrigeration and defrosting, and meanwhile, the first heat exchanger corresponding to the indoor unit with the user is kept running for heating, so that the influence on the comfort level of the user caused by overlarge room temperature fluctuation in the refrigeration and defrosting process is avoided as much as possible.
In addition, referring to fig. 7, the present invention further provides a fifth embodiment of a defrosting method for a multi-split air conditioner based on the structure of the multi-split air conditioner, where the embodiment is another embodiment of defrosting control for the multi-split air conditioner, and specifically, the defrosting method for the multi-split air conditioner includes the following steps:
step S210, when the defrosting condition is met in the heating process of the air conditioner, switching the four-way valve to enable an exhaust port of the compressor to be communicated with the outdoor heat exchanger;
step S220, obtaining a target indoor unit, wherein no user exists in an action interval of the target indoor unit;
step S230, closing second throttling devices of other indoor units except the target indoor unit;
and step S240, increasing the opening degree of a second throttling device of the target indoor unit to a first preset opening degree.
Compared with the first to fourth embodiments, the difference between this embodiment and the first to fourth embodiments is that in this embodiment, only whether a user exists in the zone where the indoor unit is located is determined, and if no user exists, the multi-split air conditioner is defrosted in a manner that a refrigeration loop of the indoor unit is switched to a refrigeration loop, and other indoor units keep a heating loop to continue heating. The influence on the comfort level of a user caused by overlarge temperature fluctuation of a room in the refrigeration and defrosting process is avoided. The indoor unit without the user in the action space may be in an open state or a non-open state, and the open state of the indoor unit is not limited herein.
The detailed defrosting control process, the defrosting principle and the effect are the same as those of the first to fourth embodiments, and the detailed principle refers to the first to fourth embodiments and is not repeated herein.
It should be noted that the above is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by using the contents of the specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The defrosting method of the multi-split air conditioner is characterized in that the multi-split air conditioner comprises an outdoor unit and at least two indoor units, the outdoor unit comprises a compressor, a four-way valve and an outdoor heat exchanger, and each indoor unit comprises a first indoor heat exchanger, a second indoor heat exchanger, a first throttling device and a second throttling device; four interfaces of the four-way valve are respectively connected with an exhaust port of the compressor, an outdoor heat exchanger, a second indoor heat exchanger and a return air port of the compressor, a first interface of the first indoor heat exchanger is connected with the exhaust port of the compressor, a second interface of the first indoor heat exchanger is connected with the outdoor heat exchanger after passing through the first throttling device, a first interface of the second indoor heat exchanger is connected with the four-way valve, and a second interface of the second indoor heat exchanger is connected with the outdoor heat exchanger after passing through the second throttling device; the defrosting method of the multi-split air conditioner comprises the following steps:
when the defrosting condition is met in the heating process of the air conditioner, the four-way valve is switched to enable the exhaust port of the compressor to be communicated with the outdoor heat exchanger;
acquiring the state of each indoor unit, wherein the state comprises opened state and unopened state;
closing a second throttling device of the opened indoor unit; and
and increasing the opening degree of a second throttling device of the unopened indoor unit to a first preset opening degree.
2. The multi-split air conditioner defrosting method as claimed in claim 1, wherein the step of increasing the opening degree of the second throttling means of the unopened indoor unit to a first preset opening degree is followed by:
and after defrosting is finished, reducing the opening degree of a second throttling device of the unopened indoor unit to a second preset opening degree, wherein the first preset opening degree is larger than the second preset opening degree.
3. The multi-split air conditioner defrosting method as claimed in claim 2, wherein the step of reducing the opening degree of the second throttling means of the unopened indoor unit to a second preset opening degree is performed while:
switching the four-way valve to enable an exhaust port of the compressor to be communicated with a first interface of the second indoor heat exchanger; and
and opening the second throttling device of the started indoor unit to a third preset opening degree.
4. The multi-split air conditioner defrosting method as claimed in any one of claims 1 to 3, wherein the outdoor unit further comprises a first switching valve and a second switching valve, the second switching valve being provided on a pipe connecting the first indoor heat exchanger and the discharge port of the compressor, the second switching valve being provided on a pipe connecting the first indoor heat exchanger and the return port of the compressor; after the step of increasing the opening degree of the second throttling device of the unopened indoor unit to the first preset opening degree:
acquiring the temperature change rate of the outdoor heat exchanger within a preset time interval;
when the temperature change rate is smaller than or equal to a preset value, closing the first switch valve and opening the second switch valve;
or when the temperature change rate is smaller than or equal to a preset value, closing the first switch valve, opening the second switch valve, and opening the second throttling device of the started indoor unit and/or the first throttling device of the unopened indoor unit.
5. The multi-split air conditioner defrosting method as claimed in claim 1, wherein the acquiring of the status of each of the indoor units, the status including activated and deactivated, further comprises:
when all the indoor units are started, acquiring a target indoor unit, wherein no user exists in an action interval of the target indoor unit;
closing second throttling devices of other indoor units except the target indoor unit; and
and increasing the opening degree of a second throttling device of the target indoor unit to a first preset opening degree.
6. The multi-split air conditioner defrosting method as set forth in claim 1,
when a defrosting instruction is received, judging that a defrosting condition is met;
or judging that the defrosting condition is met when the heating time reaches the preset time.
7. The defrosting method of the multi-split air conditioner is characterized in that the multi-split air conditioner comprises an outdoor unit and at least two indoor units, the outdoor unit comprises a compressor, a four-way valve and an outdoor heat exchanger, and each indoor unit comprises a first indoor heat exchanger, a second indoor heat exchanger, a first throttling device and a second throttling device; four interfaces of the four-way valve are respectively connected with an exhaust port of the compressor, an outdoor heat exchanger, a second indoor heat exchanger and a return air port of the compressor, a first interface of the first indoor heat exchanger is connected with the exhaust port of the compressor, a second interface of the first indoor heat exchanger is connected with the outdoor heat exchanger after passing through the first throttling device, a first interface of the second indoor heat exchanger is connected with the four-way valve, and a second interface of the second indoor heat exchanger is connected with the outdoor heat exchanger after passing through the second throttling device; the defrosting method of the multi-split air conditioner comprises the following steps:
when the defrosting condition is met in the heating process of the air conditioner, the four-way valve is switched to enable the exhaust port of the compressor to be communicated with the outdoor heat exchanger;
obtaining a target indoor unit, wherein no user exists in an action interval of the target indoor unit;
closing second throttling devices of other indoor units except the target indoor unit; and
and increasing the opening degree of a second throttling device of the target indoor unit to a first preset opening degree.
8. A multi-split air conditioner comprising a memory, a processor, and a defrosting program stored in the memory and executable on the processor, wherein the defrosting program, when executed by the processor, implements the steps of the multi-split air conditioner defrosting method as set forth in any one of claims 1 to 7.
9. A control apparatus, characterized in that the control apparatus comprises a memory, a processor, and a defrosting program stored in the memory and executable on the processor, the defrosting program, when executed by the processor, implementing the steps of the multi-split air conditioner defrosting method as set forth in any one of claims 1 to 7.
10. A storage medium, characterized in that the storage medium stores a defrosting program, which when executed by a processor, implements the respective steps of the multi-online air conditioner defrosting method according to any one of claims 1 to 7.
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