Indoor unit and air conditioner

Abstract

The indoor unit comprises an electronic expansion valve, an indoor unit main control chip and a fan driving chip, the first communication end of the indoor unit main control chip is connected with the communication end of the fan driving chip, and the output end of the fan driving chip is connected with the electronic expansion valve; and under the condition that the indoor unit main control chip is in the abnormal working state, the fan driving chip adjusts the opening degree of the electronic expansion valve. Therefore, according to the indoor unit, two-stage control over the electronic expansion valve is achieved through the indoor unit main control chip and the draught fan driving chip, under the condition that the indoor unit main control chip is in the abnormal working state, the draught fan driving chip conducts pipe connection on the electronic expansion valve so as to adjust the opening degree of the electronic expansion valve, the control stability of the electronic expansion valve is further improved, and the indoor unit is more convenient to use. And the operation stability of the indoor unit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an indoor unit and an air conditioner. Background Art

[0002] In a single-pipe, multi-split electronically controlled system, a single outdoor unit is connected to multiple indoor units via a single set of pipes. In this multi-split system, refrigerant flow is distributed through the electronic expansion valves of the indoor units. In actual use, communication anomalies with one indoor unit can occur, resulting in the outdoor unit being unable to control the indoor units. In this case, the outdoor unit cannot adjust the opening of the electronic expansion valve through the indoor master control, significantly reducing air conditioning performance. Utility Model Content

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, the first objective of the present invention is to provide an indoor unit that implements two-stage control of an electronic expansion valve using an indoor unit main control chip and a fan driver chip. If the indoor unit main control chip is operating abnormally, the fan driver chip takes over control of the electronic expansion valve to adjust its opening, further improving the control stability of the electronic expansion valve and the operational stability of the indoor unit.

[0004] The second object of the present invention is to provide an air conditioner.

[0005] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes an indoor unit, which is applied to an air conditioner. The indoor unit includes: an electronic expansion valve, an indoor unit main control chip and a fan drive chip. The first communication end of the indoor unit main control chip is connected to the communication end of the fan drive chip, and the output end of the fan drive chip is connected to the electronic expansion valve; wherein, when the indoor unit main control chip is in an abnormal working state, the fan drive chip adjusts the opening of the electronic expansion valve.

[0006] In an indoor unit according to an embodiment of the present invention, a first communication terminal of the indoor unit main control chip is connected to a communication terminal of the fan driver chip, and an output terminal of the fan driver chip is connected to the electronic expansion valve. If the indoor unit main control chip is in an abnormal operating state, the fan driver chip adjusts the opening of the electronic expansion valve. Thus, the indoor unit achieves two-level control of the electronic expansion valve through the indoor unit main control chip and the fan driver chip. If the indoor unit main control chip is in an abnormal operating state, the fan driver chip takes over control of the electronic expansion valve to adjust the opening of the electronic expansion valve, further improving the control stability of the electronic expansion valve and the operational stability of the indoor unit.

[0007] In addition, the indoor unit according to the above embodiment of the present invention may also have the following additional technical features:

[0008] Furthermore, the indoor unit further includes: a first signal isolation chip, a signal input end of the first signal isolation chip is connected to an output end of the fan drive chip, and a signal output end of the first signal isolation chip is connected to the electronic expansion valve.

[0009] Furthermore, the indoor unit also includes: a second signal isolation chip, the signal input end of the second signal isolation chip is connected to the first communication end of the indoor unit main control chip, and the signal output end of the second signal isolation chip is connected to the communication end of the fan drive chip.

[0010] Furthermore, the indoor unit also includes: a power supply module, the input end of the power supply module is connected to the external power supply, the first output end of the power supply module is respectively connected to the power supply end of the fan drive chip, the power supply end of the signal input end of the first signal isolation chip, and the power supply end of the signal output end of the second signal isolation chip, and the second output end of the power supply module is respectively connected to the power supply end of the indoor unit main control chip, the power supply end of the signal output end of the first signal isolation chip, and the power supply end of the signal input end of the second signal isolation chip.

[0011] Specifically, the power supply module includes: a power supply unit, the input end of the power supply unit is connected to the external power supply, and is used to convert the AC power provided by the external power supply into DC power to generate a third DC power; a first isolated power supply unit, the input end of the first isolated power supply unit is connected to the output end of the power supply unit, and the output end of the first isolated power supply unit is respectively connected to the power supply end of the fan drive chip, the power supply end of the signal input end of the first signal isolation chip, and the power supply end of the signal output end of the second signal isolation chip, and is used to generate a first DC power based on the third DC power; a second isolated power supply unit, the input end of the second isolated power supply unit is connected to the output end of the power supply unit, and the output end of the second isolated power supply unit is respectively connected to the power supply end of the indoor main control chip, the power supply end of the signal output end of the first signal isolation chip, and the power supply end of the signal input end of the second signal isolation chip, and is used to generate a second DC power based on the third DC power, wherein the voltage of the second DC power is less than the voltage of the first DC power.

[0012] Specifically, the output end of the indoor unit main control chip is connected to the electronic expansion valve for adjusting the opening of the electronic expansion valve.

[0013] Furthermore, the indoor unit also includes: an electronic expansion valve drive chip, the input end of the electronic expansion valve drive chip is respectively connected to the output end of the fan drive chip and the output end of the indoor unit main control chip, and the output end of the electronic expansion valve drive chip is connected to the electronic expansion valve.

[0014] Specifically, the second communication terminal of the indoor unit main control chip is connected to the communication terminal of the outdoor unit main control chip of the air conditioner; when communicating normally with the outdoor unit main control chip, the indoor unit main control chip adjusts the opening of the electronic expansion valve based on the received outdoor unit control instruction.

[0015] To achieve the above-mentioned purpose, the second embodiment of the present invention proposes an air conditioner, comprising: the above-mentioned indoor unit; an outdoor unit, the outdoor unit comprising an outdoor unit main control chip, the communication end of the outdoor unit main control chip is connected to the second communication end of the indoor unit main control chip.

[0016] According to the air conditioner of the embodiment of the present invention, based on the above-mentioned indoor unit, two-level control of the electronic expansion valve can be achieved. When the indoor unit main control chip is in an abnormal working state and the outdoor unit main control chip cannot control the opening of the electronic expansion valve through the indoor unit main control chip, the fan drive chip takes over the electronic expansion valve, thereby improving the operating stability of the air conditioner.

[0017] In addition, the air conditioner according to the above embodiment of the present invention may also have the following additional technical features:

[0018] Furthermore, the air conditioner further comprises: a wired controller, which is communicatively connected with the main control chip of the indoor unit to display faults of the main control chip of the indoor unit.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a connection diagram of an indoor unit according to an embodiment of the present utility model;

[0021] Figure 2 This is a connection diagram of an indoor unit according to an embodiment of the present utility model;

[0022] Figure 3 Schematic diagram of the connection of an air conditioner according to one embodiment of the present invention;

[0023] Figure 4 This is a connection diagram of an air conditioner according to a specific embodiment of the present utility model;

[0024] Figure 5 This is a flow chart of a method for adjusting the opening of an electronic expansion valve by a fan driver chip according to one embodiment of the present utility model;

[0025] Figure 6 The figure is a flow chart of a method for adjusting the opening of an electronic expansion valve by a fan driver chip according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The indoor unit and the air conditioner provided in the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0028] In related technologies, single-pipe multi-split system electronic control systems rely on communication between the outdoor chip and the indoor unit's main control chip to control the opening of the indoor unit's electronic expansion valve, thereby distributing refrigerant. However, if a communication anomaly occurs in a particular indoor unit, the outdoor unit will be unable to control the indoor unit, making it impossible to adjust the indoor unit's electronic expansion valve to open or close.

[0029] In order to solve the above technical problems, the present application proposes an indoor unit, in which the electronic expansion valve is controlled by the indoor unit main control chip or the fan driver chip in the indoor electronic control, making a dual-chip two-level control. When the indoor unit main control chip is in an abnormal working state, the fan driver chip takes over the electronic expansion valve to adjust the opening of the electronic expansion valve, thereby improving the control stability of the electronic expansion valve and the operation stability of the indoor unit.

[0030] Figure 1 Schematic diagram of the connection of the indoor unit according to an embodiment of the present invention.

[0031] like Figure 1 As shown, the indoor unit 200 of an embodiment of the present invention is applied to an air conditioner. The indoor unit 200 includes: an electronic expansion valve 210, an indoor unit main control chip 10 and a fan driver chip 20. The first communication end of the indoor unit main control chip 10 is connected to the communication end of the fan driver chip 20, and the output end of the fan driver chip 20 is connected to the electronic expansion valve 210; wherein, when the indoor unit main control chip 10 is in an abnormal working state, the fan driver chip 20 adjusts the opening of the electronic expansion valve.

[0032] Specifically, the electronic expansion valve 210 is a valve body for controlling the flow of refrigerant, and the fan driving chip 20 is a power module for driving the motor.

[0033] Under normal circumstances, the indoor unit main control chip 10 controls the opening of the electronic expansion valve 210 to distribute the refrigerant flow. Based on the control signal output by the indoor unit main control chip 10, the fan driver chip 20 controls the indoor unit's fan motor, which blows air inside the air conditioner. Simultaneously, the fan driver chip 20 communicates with the indoor unit main control chip 10 to obtain real-time information about the indoor unit main control chip 10's control of the electronic expansion valve 210's opening and its operating status.

[0034] When the indoor unit main control chip 10 is in an abnormal working state, for example, when the indoor unit main control chip 10 determines that it is working abnormally through self-test, the corresponding status flag is set to 1, and the fan driver chip 20 reads the status flag of the indoor unit main control chip 10 based on communication. When it is determined that the status flag is 1, it is considered that the indoor unit main control chip 10 is in an abnormal working state, and then the electronic expansion valve 210 is taken over. The fan driver chip 20 adjusts the opening of the electronic expansion valve 210 to achieve the distribution of the refrigerant flow. In addition, the fan driver chip 20 can also determine the working state of the indoor unit main control chip 10 based on whether the communication between the indoor unit main control chip 10 and the indoor unit main control chip 10 is normal. When the fan driver chip 20 cannot communicate normally with the indoor unit main control chip 20, it is considered that the indoor unit main control chip 10 is in an abnormal working state and takes over the electronic expansion valve 210 to adjust the opening of the electronic expansion valve 210.

[0035] This embodiment realizes two-level control of the electronic expansion valve 210 through the indoor unit main control chip 10 and the fan drive chip 20. When the indoor unit main control chip 10 cannot control the electronic expansion valve 210, the fan drive chip 20 can take over and drive the electronic expansion valve 210, thereby improving the control effect of the electronic expansion valve 210 and improving the operating stability of the indoor unit 200.

[0036] Combine Figure 2 As shown, in one embodiment of the present utility model, the indoor unit 200 also includes: a first signal isolation chip 30, the signal input end of the first signal isolation chip 30 is connected to the output end of the fan drive chip 20, and the signal output end of the first signal isolation chip 30 is connected to the electronic expansion valve 210.

[0037] That is, the fan driving chip 20 controls the electronic expansion valve 210 through the first signal isolation chip 30 , thereby improving the reliability and security of communication between the fan driving chip 20 and the electronic expansion valve 30 .

[0038] In one embodiment of the present invention, the indoor unit 200 also includes: a second signal isolation chip 40, the signal input end of the second signal isolation chip 40 is connected to the first communication end of the indoor unit main control chip 10, and the signal output end of the second signal isolation chip 40 is connected to the communication end of the fan drive chip 20.

[0039] That is, the indoor unit main control chip 10 communicates with the fan driving chip 20 through the second signal isolation chip 40 , thereby improving the communication reliability and security between the indoor unit main control chip 10 and the fan driving chip 20 .

[0040] In one embodiment of the present utility model, the indoor unit 200 also includes: a power supply module 50, the input end of the power supply module 50 is connected to an external power supply, the first output end of the power supply module 50 is respectively connected to the power supply end of the fan drive chip 20, the power supply end of the signal input end of the first signal isolation chip 30, and the power supply end of the signal output end of the second signal isolation chip 40, and the second output end of the power supply module 50 is respectively connected to the power supply end of the indoor unit main control chip 10, the power supply end of the signal output end of the first signal isolation chip 30, and the power supply end of the signal input end of the second signal isolation chip 40.

[0041] In other words, the power supply module 50 is used to convert the electrical signal provided by the external power supply into a first electrical signal and a second electrical signal, respectively, to power the entire indoor unit electronic control system. The first electrical signal is supplied to the fan driver chip 20, the signal input terminal of the first signal isolation chip 30, and the signal output terminal of the second signal isolation chip 40 via the first output terminal of the power supply module 50. The second electrical signal is supplied to the indoor unit main control chip 10, the signal output terminal of the first signal isolation chip 30, and the signal input terminal of the second signal isolation chip 40 via the second output terminal of the power supply module 50. The first electrical signal and the second electrical signal can be direct currents of different voltages, which can be set based on actual conditions.

[0042] In one embodiment of the present invention, the power supply module 50 includes: a power supply unit 51, the input end of the power supply unit 51 is connected to an external power supply, and is used to convert the AC power provided by the external power supply into DC power to generate a third DC power; a first isolated power supply unit 52, the input end of the first isolated power supply unit 52 is connected to the output end of the power supply unit 51, and the output end of the first isolated power supply unit 52 is respectively connected to the power supply end of the fan drive chip 20, the power supply end of the signal input end of the first signal isolation chip 30, and the power supply end of the signal output end of the second signal isolation chip 40, and is used to generate a first DC power based on the third DC power; a second isolated power supply unit 53, the input end of the second isolated power supply unit 53 is connected to the output end of the power supply unit 51, and the output end of the second isolated power supply unit 53 is respectively connected to the power supply end of the indoor main control chip 10, the power supply end of the signal output end of the first signal isolation chip 30, and the power supply end of the signal input end of the second signal isolation chip 40, and is used to generate a second DC power based on the third DC power, wherein the voltage of the second DC power is less than the voltage of the first DC power.

[0043] That is, the external power supply is used to provide AC power, and the power supply unit 51 is an ACDC (Alternating Current to Direct Current, AC-DC) conversion unit, which is used to convert AC power into a third DC power to power the entire indoor electronic control system. Then, the first isolated power supply unit 52 steps down the third DC power to generate a first DC power, i.e., high-voltage DC power, to power the fan drive chip 20, the signal input end of the first signal isolation chip 30, and the signal output end of the second signal isolation chip 40, i.e., the first isolated power supply unit 52 is used to power the drive electronic control system. The second isolated power supply unit 53 steps down the third DC power to generate a second DC power, i.e., low-voltage DC power, to power the power supply end of the indoor main control chip 10, the power supply end of the signal output end of the first signal isolation chip 30, and the power supply end of the signal input end of the second signal isolation chip 40, i.e., the second isolated power supply unit 53 is used to power the control electronic control system.

[0044] In one embodiment of the present invention, the output end of the internal unit main control chip 10 is connected to the electronic expansion valve 210 for adjusting the opening of the electronic expansion valve 210 .

[0045] That is, when the indoor unit main control chip 10 is in a normal working state, the indoor unit main control chip 10 controls the opening of the electronic expansion valve 10 .

[0046] In one embodiment of the present utility model, the indoor unit 200 also includes: an electronic expansion valve driver chip 60, the input end of the electronic expansion valve driver chip 60 is respectively connected to the output end of the fan driver chip 20 and the output end of the indoor unit main control chip 10, and the output end of the electronic expansion valve driver chip 60 is connected to the electronic expansion valve 210.

[0047] Specifically, the electronic expansion valve driver chip 60 is a power device that drives the electronic expansion valve. When the indoor unit main control chip 10 is operating normally, it generates a control signal 3a to the electronic expansion valve driver chip 60. Based on the control signal 3a, the electronic expansion valve driver chip 60 controls the opening of the electronic expansion valve 210. Meanwhile, the fan driver chip 20 only generates a control signal 1 to control the fan motor 220. When the indoor unit main control chip 10 is operating abnormally, the indoor unit main control chip 10 is unable to generate the control signal 3a. The fan driver chip 20 takes over control of the electronic expansion valve 210 and generates a control signal 2, which is then output as a control signal 3b via the second signal isolation chip 40. The electronic expansion valve driver chip 60 controls the opening of the electronic expansion valve 210 based on the control signal 3b.

[0048] In one embodiment of the present invention, the second communication end of the indoor unit main control chip 10 is connected to the communication end of the outdoor unit main control chip 310 of the outdoor unit 300 of the air conditioner; when communicating normally with the outdoor unit main control chip 310, the indoor unit main control chip 10 adjusts the opening of the electronic expansion valve 210 based on the received outdoor unit control instruction.

[0049] That is, when the indoor main control chip 10 is in a normal state, it receives the outdoor control instruction sent by the outdoor main control chip 310 and generates a control signal 3 a according to the outdoor control instruction to control the opening of the electronic expansion valve 210 .

[0050] In summary, according to the indoor unit of the present invention, the first communication terminal of the indoor unit main control chip is connected to the communication terminal of the fan driver chip, and the output terminal of the fan driver chip is connected to the electronic expansion valve. If the indoor unit main control chip is in an abnormal operating state, the fan driver chip adjusts the opening of the electronic expansion valve. Thus, the indoor unit achieves two-level control of the electronic expansion valve through the indoor unit main control chip and the fan driver chip. If the indoor unit main control chip is in an abnormal operating state, the fan driver chip takes over control of the electronic expansion valve to adjust the opening of the electronic expansion valve, further improving the control stability of the electronic expansion valve and the operational stability of the indoor unit.

[0051] Corresponding to the above embodiment, the present utility model also provides an air conditioner.

[0052] like Figure 3As shown, the air conditioner 1000 of the embodiment of the present invention includes: the indoor unit 200 mentioned above; the outdoor unit 300, the outdoor unit 300 includes an outdoor unit main control chip 310, and the communication end of the outdoor unit main control chip 310 is connected to the second communication end of the indoor unit main control chip 10.

[0053] That is, when the internal unit main control chip 10 is in a normal state, control actions are performed based on communication with the external unit main control chip 310 .

[0054] like Figure 4 As shown, according to an embodiment of the present invention, the air conditioner 1000 further includes: a wired controller 400 , which is communicatively connected to the indoor unit main control chip 10 to display faults of the indoor unit main control chip 10 .

[0055] Specifically, when the internal machine main control chip 10 fails, if the wire controller 400 can communicate normally with the internal machine main control chip 10 to obtain the fault status of the internal machine main control chip 10, the fault will be reported through the wire controller 400; if the wire controller 400 cannot communicate with the internal machine main control chip 10, the system status will be maintained.

[0056] According to the air conditioner of the embodiment of the present invention, based on the above-mentioned indoor unit, two-level control of the electronic expansion valve can be achieved. When the indoor unit main control chip is in an abnormal working state and the outdoor unit main control chip cannot control the opening of the electronic expansion valve through the indoor unit main control chip, the fan drive chip takes over the electronic expansion valve, thereby improving the operating stability of the air conditioner.

[0057] In addition, the fan driver chip takes over the control method of the electronic expansion valve as follows Figure 5 As shown, the following steps may be included:

[0058] S1, when the indoor unit main control chip is in an abnormal working state, obtain the current working mode of the air conditioner;

[0059] S2, determining the target opening based on the current working mode;

[0060] S3, adjusting the opening of the electronic expansion valve based on the target opening.

[0061] That is to say, when the fan driver chip determines that the indoor unit main control chip is in an abnormal working state, it takes over the electronic expansion valve and obtains the current working mode of the air conditioner, which can be obtained based on real-time communication with the indoor unit main control chip. If the fan driver chip and the indoor unit main control chip cannot communicate, the working mode determined during the last communication is used as the current working mode of the air conditioner, without any specific restrictions.

[0062] The target opening is then determined based on the current working mode. For example, a preset mapping table between the working mode and the opening can be established in advance. After determining the current working mode, the target opening is determined by looking up the table, and then a control signal is generated based on the target opening to adjust the opening of the electronic expansion valve to the target opening to meet the refrigerant flow requirements under different working modes.

[0063] As a specific embodiment of the present invention, Figure 6 As shown, the opening adjustment method of the electronic expansion valve is as follows: Figure 2 The fan driver chip shown in the figure may execute the following steps:

[0064] S101, determine whether the communication with the internal machine main control chip is normal. If yes, go to step S102; if not, go to step S103.

[0065] S102: Determine that the main control chip of the indoor unit is in a normal working state, and control the electronic expansion valve by the main control chip of the indoor unit. Execute step S101.

[0066] S103: If the indoor unit main control chip is in an abnormal working state, the fan driver chip takes over the electronic expansion valve. Meanwhile, if the indoor unit main control chip is in an abnormal working state, the fan driver chip turns off the fan.

[0067] S104: Adjust the opening of the electronic expansion valve to zero.

[0068] S105: Acquire the current operating mode of the air conditioner.

[0069] S106: Determine a target opening based on the current working mode.

[0070] S107: Adjust the opening of the electronic expansion valve based on the target opening.

[0071] For example, when the cooling mode enters standby mode, the electronic expansion valve is completely closed, and when the heating mode enters standby mode, the opening of the electronic expansion valve is adjusted to n steps.

[0072] It is understandable that when the indoor unit is turned on, the indoor unit main control chip is first self-checked. The self-check process may specifically include: whether the indoor unit main control chip can start normally; whether there is a communication failure between the indoor unit main control chip and the outdoor unit. When the indoor unit main chip starts normally or there is a communication failure between the indoor unit main chip and the outdoor unit, the indoor unit will not start and remain in the non-start state. Only when the indoor unit main chip starts normally and the indoor and outdoor communications are normal, will it start normally and execute the subsequent indoor unit control process. In the indoor unit control process, the indoor unit is turned on according to the indoor unit demand, the indoor unit receives the outdoor unit command, and turns on the load and controls the electronic expansion valve according to the outdoor unit command.

[0073] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0075] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0076] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An indoor unit, characterized in that: Applied to an air conditioner, the indoor unit includes: an electronic expansion valve, an indoor unit main control chip and a fan drive chip, the first communication terminal of the indoor unit main control chip is connected to the communication terminal of the fan drive chip, and the output terminal of the fan drive chip is connected to the electronic expansion valve; wherein, When the indoor unit main control chip is in an abnormal working state, the fan driving chip adjusts the opening of the electronic expansion valve.

2. The indoor unit according to claim 1, characterized in that: Also includes: A first signal isolation chip, wherein the signal input end of the first signal isolation chip is connected to the output end of the fan drive chip, and the signal output end of the first signal isolation chip is connected to the electronic expansion valve.

3. The indoor unit according to claim 2, characterized in that: Also includes: A second signal isolation chip, wherein the signal input end of the second signal isolation chip is connected to the first communication end of the indoor unit main control chip, and the signal output end of the second signal isolation chip is connected to the communication end of the fan drive chip.

4. The indoor unit according to claim 3, characterized in that: Also includes: A power supply module, the input end of the power supply module is connected to an external power supply, the first output end of the power supply module is respectively connected to the power supply end of the fan drive chip, the power supply end of the signal input end of the first signal isolation chip, and the power supply end of the signal output end of the second signal isolation chip, and the second output end of the power supply module is respectively connected to the power supply end of the indoor main control chip, the power supply end of the signal output end of the first signal isolation chip, and the power supply end of the signal input end of the second signal isolation chip.

5. The indoor unit according to claim 4, characterized in that: The power supply module includes: a power supply unit, wherein an input end of the power supply unit is connected to the external power supply and is configured to perform AC-DC conversion on the AC power provided by the external power supply to generate a third DC power; a first isolated power supply unit, wherein the input end of the first isolated power supply unit is connected to the output end of the power supply unit, the output end of the first isolated power supply unit is respectively connected to the power supply end of the fan driver chip, the power supply end of the signal input end of the first signal isolation chip, and the power supply end of the signal output end of the second signal isolation chip, and is configured to generate a first direct current based on the third direct current; A second isolated power supply unit, wherein the input end of the second isolated power supply unit is connected to the output end of the power supply unit, and the output end of the second isolated power supply unit is respectively connected to the power supply end of the internal machine main control chip, the power supply end of the signal output end of the first signal isolation chip, and the power supply end of the signal input end of the second signal isolation chip, and is used to generate a second direct current based on the third direct current, wherein the voltage of the second direct current is less than the voltage of the first direct current.

6. The indoor unit according to any one of claims 1 to 5, characterized in that: The output end of the internal machine main control chip is connected to the electronic expansion valve for adjusting the opening of the electronic expansion valve.

7. The indoor unit according to claim 6, characterized in that: Also includes: An electronic expansion valve drive chip, wherein the input end of the electronic expansion valve drive chip is respectively connected to the output end of the fan drive chip and the output end of the indoor unit main control chip, and the output end of the electronic expansion valve drive chip is connected to the electronic expansion valve.

8. The indoor unit according to claim 6, characterized in that: The second communication terminal of the indoor unit main control chip is connected to the communication terminal of the outdoor unit main control chip of the air conditioner; When communicating normally with the external unit main control chip, the internal unit main control chip adjusts the opening of the electronic expansion valve based on the received external unit control instruction.

9. An air conditioner, characterized in that: include: The indoor unit according to any one of claims 1 to 8; The outdoor unit includes an outdoor unit main control chip, and a communication end of the outdoor unit main control chip is connected to a second communication end of the indoor unit main control chip.

10. The air conditioner according to claim 9, characterized in that Also includes: A wired controller is communicatively connected to the internal machine main control chip to display faults of the internal machine main control chip.

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